1/* -*- mode: asm -*- 2** 3** head.S -- This file contains the initial boot code for the 4** Linux/68k kernel. 5** 6** Copyright 1993 by Hamish Macdonald 7** 8** 68040 fixes by Michael Rausch 9** 68060 fixes by Roman Hodek 10** MMU cleanup by Randy Thelen 11** Final MMU cleanup by Roman Zippel 12** 13** Atari support by Andreas Schwab, using ideas of Robert de Vries 14** and Bjoern Brauel 15** VME Support by Richard Hirst 16** 17** 94/11/14 Andreas Schwab: put kernel at PAGESIZE 18** 94/11/18 Andreas Schwab: remove identity mapping of STRAM for Atari 19** ++ Bjoern & Roman: ATARI-68040 support for the Medusa 20** 95/11/18 Richard Hirst: Added MVME166 support 21** 96/04/26 Guenther Kelleter: fixed identity mapping for Falcon with 22** Magnum- and FX-alternate ram 23** 98/04/25 Phil Blundell: added HP300 support 24** 1998/08/30 David Kilzer: Added support for font_desc structures 25** for linux-2.1.115 26** 9/02/11 Richard Zidlicky: added Q40 support (initial vesion 99/01/01) 27** 2004/05/13 Kars de Jong: Finalised HP300 support 28** 29** This file is subject to the terms and conditions of the GNU General Public 30** License. See the file README.legal in the main directory of this archive 31** for more details. 32** 33*/ 34 35/* 36 * Linux startup code. 37 * 38 * At this point, the boot loader has: 39 * Disabled interrupts 40 * Disabled caches 41 * Put us in supervisor state. 42 * 43 * The kernel setup code takes the following steps: 44 * . Raise interrupt level 45 * . Set up initial kernel memory mapping. 46 * . This sets up a mapping of the 4M of memory the kernel is located in. 47 * . It also does a mapping of any initial machine specific areas. 48 * . Enable the MMU 49 * . Enable cache memories 50 * . Jump to kernel startup 51 * 52 * Much of the file restructuring was to accomplish: 53 * 1) Remove register dependency through-out the file. 54 * 2) Increase use of subroutines to perform functions 55 * 3) Increase readability of the code 56 * 57 * Of course, readability is a subjective issue, so it will never be 58 * argued that that goal was accomplished. It was merely a goal. 59 * A key way to help make code more readable is to give good 60 * documentation. So, the first thing you will find is exaustive 61 * write-ups on the structure of the file, and the features of the 62 * functional subroutines. 63 * 64 * General Structure: 65 * ------------------ 66 * Without a doubt the single largest chunk of head.S is spent 67 * mapping the kernel and I/O physical space into the logical range 68 * for the kernel. 69 * There are new subroutines and data structures to make MMU 70 * support cleaner and easier to understand. 71 * First, you will find a routine call "mmu_map" which maps 72 * a logical to a physical region for some length given a cache 73 * type on behalf of the caller. This routine makes writing the 74 * actual per-machine specific code very simple. 75 * A central part of the code, but not a subroutine in itself, 76 * is the mmu_init code which is broken down into mapping the kernel 77 * (the same for all machines) and mapping machine-specific I/O 78 * regions. 79 * Also, there will be a description of engaging the MMU and 80 * caches. 81 * You will notice that there is a chunk of code which 82 * can emit the entire MMU mapping of the machine. This is present 83 * only in debug modes and can be very helpful. 84 * Further, there is a new console driver in head.S that is 85 * also only engaged in debug mode. Currently, it's only supported 86 * on the Macintosh class of machines. However, it is hoped that 87 * others will plug-in support for specific machines. 88 * 89 * ###################################################################### 90 * 91 * mmu_map 92 * ------- 93 * mmu_map was written for two key reasons. First, it was clear 94 * that it was very difficult to read the previous code for mapping 95 * regions of memory. Second, the Macintosh required such extensive 96 * memory allocations that it didn't make sense to propagate the 97 * existing code any further. 98 * mmu_map requires some parameters: 99 * 100 * mmu_map (logical, physical, length, cache_type) 101 * 102 * While this essentially describes the function in the abstract, you'll 103 * find more indepth description of other parameters at the implementation site. 104 * 105 * mmu_get_root_table_entry 106 * ------------------------ 107 * mmu_get_ptr_table_entry 108 * ----------------------- 109 * mmu_get_page_table_entry 110 * ------------------------ 111 * 112 * These routines are used by other mmu routines to get a pointer into 113 * a table, if necessary a new table is allocated. These routines are working 114 * basically like pmd_alloc() and pte_alloc() in <asm/pgtable.h>. The root 115 * table needs of course only to be allocated once in mmu_get_root_table_entry, 116 * so that here also some mmu specific initialization is done. The second page 117 * at the start of the kernel (the first page is unmapped later) is used for 118 * the kernel_pg_dir. It must be at a position known at link time (as it's used 119 * to initialize the init task struct) and since it needs special cache 120 * settings, it's the easiest to use this page, the rest of the page is used 121 * for further pointer tables. 122 * mmu_get_page_table_entry allocates always a whole page for page tables, this 123 * means 1024 pages and so 4MB of memory can be mapped. It doesn't make sense 124 * to manage page tables in smaller pieces as nearly all mappings have that 125 * size. 126 * 127 * ###################################################################### 128 * 129 * 130 * ###################################################################### 131 * 132 * mmu_engage 133 * ---------- 134 * Thanks to a small helping routine enabling the mmu got quite simple 135 * and there is only one way left. mmu_engage makes a complete a new mapping 136 * that only includes the absolute necessary to be able to jump to the final 137 * postion and to restore the original mapping. 138 * As this code doesn't need a transparent translation register anymore this 139 * means all registers are free to be used by machines that needs them for 140 * other purposes. 141 * 142 * ###################################################################### 143 * 144 * mmu_print 145 * --------- 146 * This algorithm will print out the page tables of the system as 147 * appropriate for an 030 or an 040. This is useful for debugging purposes 148 * and as such is enclosed in #ifdef MMU_PRINT/#endif clauses. 149 * 150 * ###################################################################### 151 * 152 * console_init 153 * ------------ 154 * The console is also able to be turned off. The console in head.S 155 * is specifically for debugging and can be very useful. It is surrounded by 156 * #ifdef CONSOLE/#endif clauses so it doesn't have to ship in known-good 157 * kernels. It's basic algorithm is to determine the size of the screen 158 * (in height/width and bit depth) and then use that information for 159 * displaying an 8x8 font or an 8x16 (widthxheight). I prefer the 8x8 for 160 * debugging so I can see more good data. But it was trivial to add support 161 * for both fonts, so I included it. 162 * Also, the algorithm for plotting pixels is abstracted so that in 163 * theory other platforms could add support for different kinds of frame 164 * buffers. This could be very useful. 165 * 166 * console_put_penguin 167 * ------------------- 168 * An important part of any Linux bring up is the penguin and there's 169 * nothing like getting the Penguin on the screen! This algorithm will work 170 * on any machine for which there is a console_plot_pixel. 171 * 172 * console_scroll 173 * -------------- 174 * My hope is that the scroll algorithm does the right thing on the 175 * various platforms, but it wouldn't be hard to add the test conditions 176 * and new code if it doesn't. 177 * 178 * console_putc 179 * ------------- 180 * 181 * ###################################################################### 182 * 183 * Register usage has greatly simplified within head.S. Every subroutine 184 * saves and restores all registers that it modifies (except it returns a 185 * value in there of course). So the only register that needs to be initialized 186 * is the stack pointer. 187 * All other init code and data is now placed in the init section, so it will 188 * be automatically freed at the end of the kernel initialization. 189 * 190 * ###################################################################### 191 * 192 * options 193 * ------- 194 * There are many options available in a build of this file. I've 195 * taken the time to describe them here to save you the time of searching 196 * for them and trying to understand what they mean. 197 * 198 * CONFIG_xxx: These are the obvious machine configuration defines created 199 * during configuration. These are defined in autoconf.h. 200 * 201 * CONSOLE: There is support for head.S console in this file. This 202 * console can talk to a Mac frame buffer, but could easily be extrapolated 203 * to extend it to support other platforms. 204 * 205 * TEST_MMU: This is a test harness for running on any given machine but 206 * getting an MMU dump for another class of machine. The classes of machines 207 * that can be tested are any of the makes (Atari, Amiga, Mac, VME, etc.) 208 * and any of the models (030, 040, 060, etc.). 209 * 210 * NOTE: TEST_MMU is NOT permanent! It is scheduled to be removed 211 * When head.S boots on Atari, Amiga, Macintosh, and VME 212 * machines. At that point the underlying logic will be 213 * believed to be solid enough to be trusted, and TEST_MMU 214 * can be dropped. Do note that that will clean up the 215 * head.S code significantly as large blocks of #if/#else 216 * clauses can be removed. 217 * 218 * MMU_NOCACHE_KERNEL: On the Macintosh platform there was an inquiry into 219 * determing why devices don't appear to work. A test case was to remove 220 * the cacheability of the kernel bits. 221 * 222 * MMU_PRINT: There is a routine built into head.S that can display the 223 * MMU data structures. It outputs its result through the serial_putc 224 * interface. So where ever that winds up driving data, that's where the 225 * mmu struct will appear. On the Macintosh that's typically the console. 226 * 227 * SERIAL_DEBUG: There are a series of putc() macro statements 228 * scattered through out the code to give progress of status to the 229 * person sitting at the console. This constant determines whether those 230 * are used. 231 * 232 * DEBUG: This is the standard DEBUG flag that can be set for building 233 * the kernel. It has the effect adding additional tests into 234 * the code. 235 * 236 * FONT_6x11: 237 * FONT_8x8: 238 * FONT_8x16: 239 * In theory these could be determined at run time or handed 240 * over by the booter. But, let's be real, it's a fine hard 241 * coded value. (But, you will notice the code is run-time 242 * flexible!) A pointer to the font's struct font_desc 243 * is kept locally in Lconsole_font. It is used to determine 244 * font size information dynamically. 245 * 246 * Atari constants: 247 * USE_PRINTER: Use the printer port for serial debug. 248 * USE_SCC_B: Use the SCC port A (Serial2) for serial debug. 249 * USE_SCC_A: Use the SCC port B (Modem2) for serial debug. 250 * USE_MFP: Use the ST-MFP port (Modem1) for serial debug. 251 * 252 * Macintosh constants: 253 * MAC_SERIAL_DEBUG: Turns on serial debug output for the Macintosh. 254 * MAC_USE_SCC_A: Use the SCC port A (modem) for serial debug. 255 * MAC_USE_SCC_B: Use the SCC port B (printer) for serial debug (default). 256 */ 257 258#include <linux/linkage.h> 259#include <linux/init.h> 260#include <asm/bootinfo.h> 261#include <asm/setup.h> 262#include <asm/entry.h> 263#include <asm/pgtable.h> 264#include <asm/page.h> 265#include <asm/asm-offsets.h> 266 267#ifdef CONFIG_MAC 268 269#include <asm/machw.h> 270 271/* 272 * Macintosh console support 273 */ 274 275#ifdef CONFIG_FRAMEBUFFER_CONSOLE 276#define CONSOLE 277#define CONSOLE_PENGUIN 278#endif 279 280/* 281 * Macintosh serial debug support; outputs boot info to the printer 282 * and/or modem serial ports 283 */ 284#undef MAC_SERIAL_DEBUG 285 286/* 287 * Macintosh serial debug port selection; define one or both; 288 * requires MAC_SERIAL_DEBUG to be defined 289 */ 290#define MAC_USE_SCC_A /* Macintosh modem serial port */ 291#define MAC_USE_SCC_B /* Macintosh printer serial port */ 292 293#endif /* CONFIG_MAC */ 294 295#undef MMU_PRINT 296#undef MMU_NOCACHE_KERNEL 297#define SERIAL_DEBUG 298#undef DEBUG 299 300/* 301 * For the head.S console, there are three supported fonts, 6x11, 8x16 and 8x8. 302 * The 8x8 font is harder to read but fits more on the screen. 303 */ 304#define FONT_8x8 /* default */ 305/* #define FONT_8x16 */ /* 2nd choice */ 306/* #define FONT_6x11 */ /* 3rd choice */ 307 308.globl kernel_pg_dir 309.globl availmem 310.globl m68k_pgtable_cachemode 311.globl m68k_supervisor_cachemode 312#ifdef CONFIG_MVME16x 313.globl mvme_bdid 314#endif 315#ifdef CONFIG_Q40 316.globl q40_mem_cptr 317#endif 318 319CPUTYPE_040 = 1 /* indicates an 040 */ 320CPUTYPE_060 = 2 /* indicates an 060 */ 321CPUTYPE_0460 = 3 /* if either above are set, this is set */ 322CPUTYPE_020 = 4 /* indicates an 020 */ 323 324/* Translation control register */ 325TC_ENABLE = 0x8000 326TC_PAGE8K = 0x4000 327TC_PAGE4K = 0x0000 328 329/* Transparent translation registers */ 330TTR_ENABLE = 0x8000 /* enable transparent translation */ 331TTR_ANYMODE = 0x4000 /* user and kernel mode access */ 332TTR_KERNELMODE = 0x2000 /* only kernel mode access */ 333TTR_USERMODE = 0x0000 /* only user mode access */ 334TTR_CI = 0x0400 /* inhibit cache */ 335TTR_RW = 0x0200 /* read/write mode */ 336TTR_RWM = 0x0100 /* read/write mask */ 337TTR_FCB2 = 0x0040 /* function code base bit 2 */ 338TTR_FCB1 = 0x0020 /* function code base bit 1 */ 339TTR_FCB0 = 0x0010 /* function code base bit 0 */ 340TTR_FCM2 = 0x0004 /* function code mask bit 2 */ 341TTR_FCM1 = 0x0002 /* function code mask bit 1 */ 342TTR_FCM0 = 0x0001 /* function code mask bit 0 */ 343 344/* Cache Control registers */ 345CC6_ENABLE_D = 0x80000000 /* enable data cache (680[46]0) */ 346CC6_FREEZE_D = 0x40000000 /* freeze data cache (68060) */ 347CC6_ENABLE_SB = 0x20000000 /* enable store buffer (68060) */ 348CC6_PUSH_DPI = 0x10000000 /* disable CPUSH invalidation (68060) */ 349CC6_HALF_D = 0x08000000 /* half-cache mode for data cache (68060) */ 350CC6_ENABLE_B = 0x00800000 /* enable branch cache (68060) */ 351CC6_CLRA_B = 0x00400000 /* clear all entries in branch cache (68060) */ 352CC6_CLRU_B = 0x00200000 /* clear user entries in branch cache (68060) */ 353CC6_ENABLE_I = 0x00008000 /* enable instruction cache (680[46]0) */ 354CC6_FREEZE_I = 0x00004000 /* freeze instruction cache (68060) */ 355CC6_HALF_I = 0x00002000 /* half-cache mode for instruction cache (68060) */ 356CC3_ALLOC_WRITE = 0x00002000 /* write allocate mode(68030) */ 357CC3_ENABLE_DB = 0x00001000 /* enable data burst (68030) */ 358CC3_CLR_D = 0x00000800 /* clear data cache (68030) */ 359CC3_CLRE_D = 0x00000400 /* clear entry in data cache (68030) */ 360CC3_FREEZE_D = 0x00000200 /* freeze data cache (68030) */ 361CC3_ENABLE_D = 0x00000100 /* enable data cache (68030) */ 362CC3_ENABLE_IB = 0x00000010 /* enable instruction burst (68030) */ 363CC3_CLR_I = 0x00000008 /* clear instruction cache (68030) */ 364CC3_CLRE_I = 0x00000004 /* clear entry in instruction cache (68030) */ 365CC3_FREEZE_I = 0x00000002 /* freeze instruction cache (68030) */ 366CC3_ENABLE_I = 0x00000001 /* enable instruction cache (68030) */ 367 368/* Miscellaneous definitions */ 369PAGESIZE = 4096 370PAGESHIFT = 12 371 372ROOT_TABLE_SIZE = 128 373PTR_TABLE_SIZE = 128 374PAGE_TABLE_SIZE = 64 375ROOT_INDEX_SHIFT = 25 376PTR_INDEX_SHIFT = 18 377PAGE_INDEX_SHIFT = 12 378 379#ifdef DEBUG 380/* When debugging use readable names for labels */ 381#ifdef __STDC__ 382#define L(name) .head.S.##name 383#else 384#define L(name) .head.S./**/name 385#endif 386#else 387#ifdef __STDC__ 388#define L(name) .L##name 389#else 390#define L(name) .L/**/name 391#endif 392#endif 393 394/* The __INITDATA stuff is a no-op when ftrace or kgdb are turned on */ 395#ifndef __INITDATA 396#define __INITDATA .data 397#define __FINIT .previous 398#endif 399 400/* Several macros to make the writing of subroutines easier: 401 * - func_start marks the beginning of the routine which setups the frame 402 * register and saves the registers, it also defines another macro 403 * to automatically restore the registers again. 404 * - func_return marks the end of the routine and simply calls the prepared 405 * macro to restore registers and jump back to the caller. 406 * - func_define generates another macro to automatically put arguments 407 * onto the stack call the subroutine and cleanup the stack again. 408 */ 409 410/* Within subroutines these macros can be used to access the arguments 411 * on the stack. With STACK some allocated memory on the stack can be 412 * accessed and ARG0 points to the return address (used by mmu_engage). 413 */ 414#define STACK %a6@(stackstart) 415#define ARG0 %a6@(4) 416#define ARG1 %a6@(8) 417#define ARG2 %a6@(12) 418#define ARG3 %a6@(16) 419#define ARG4 %a6@(20) 420 421.macro func_start name,saveregs,stack=0 422L(\name): 423 linkw %a6,#-\stack 424 moveml \saveregs,%sp@- 425.set stackstart,-\stack 426 427.macro func_return_\name 428 moveml %sp@+,\saveregs 429 unlk %a6 430 rts 431.endm 432.endm 433 434.macro func_return name 435 func_return_\name 436.endm 437 438.macro func_call name 439 jbsr L(\name) 440.endm 441 442.macro move_stack nr,arg1,arg2,arg3,arg4 443.if \nr 444 move_stack "(\nr-1)",\arg2,\arg3,\arg4 445 movel \arg1,%sp@- 446.endif 447.endm 448 449.macro func_define name,nr=0 450.macro \name arg1,arg2,arg3,arg4 451 move_stack \nr,\arg1,\arg2,\arg3,\arg4 452 func_call \name 453.if \nr 454 lea %sp@(\nr*4),%sp 455.endif 456.endm 457.endm 458 459func_define mmu_map,4 460func_define mmu_map_tt,4 461func_define mmu_fixup_page_mmu_cache,1 462func_define mmu_temp_map,2 463func_define mmu_engage 464func_define mmu_get_root_table_entry,1 465func_define mmu_get_ptr_table_entry,2 466func_define mmu_get_page_table_entry,2 467func_define mmu_print 468func_define get_new_page 469#if defined(CONFIG_HP300) || defined(CONFIG_APOLLO) 470func_define set_leds 471#endif 472 473.macro mmu_map_eq arg1,arg2,arg3 474 mmu_map \arg1,\arg1,\arg2,\arg3 475.endm 476 477.macro get_bi_record record 478 pea \record 479 func_call get_bi_record 480 addql #4,%sp 481.endm 482 483func_define serial_putc,1 484func_define console_putc,1 485 486func_define console_init 487func_define console_put_stats 488func_define console_put_penguin 489func_define console_plot_pixel,3 490func_define console_scroll 491 492.macro putc ch 493#if defined(CONSOLE) || defined(SERIAL_DEBUG) 494 pea \ch 495#endif 496#ifdef CONSOLE 497 func_call console_putc 498#endif 499#ifdef SERIAL_DEBUG 500 func_call serial_putc 501#endif 502#if defined(CONSOLE) || defined(SERIAL_DEBUG) 503 addql #4,%sp 504#endif 505.endm 506 507.macro dputc ch 508#ifdef DEBUG 509 putc \ch 510#endif 511.endm 512 513func_define putn,1 514 515.macro dputn nr 516#ifdef DEBUG 517 putn \nr 518#endif 519.endm 520 521.macro puts string 522#if defined(CONSOLE) || defined(SERIAL_DEBUG) 523 __INITDATA 524.Lstr\@: 525 .string "\string" 526 __FINIT 527 pea %pc@(.Lstr\@) 528 func_call puts 529 addql #4,%sp 530#endif 531.endm 532 533.macro dputs string 534#ifdef DEBUG 535 puts "\string" 536#endif 537.endm 538 539#define is_not_amiga(lab) cmpl &MACH_AMIGA,%pc@(m68k_machtype); jne lab 540#define is_not_atari(lab) cmpl &MACH_ATARI,%pc@(m68k_machtype); jne lab 541#define is_not_mac(lab) cmpl &MACH_MAC,%pc@(m68k_machtype); jne lab 542#define is_not_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jne lab 543#define is_not_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jne lab 544#define is_not_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jne lab 545#define is_mvme147(lab) cmpl &MACH_MVME147,%pc@(m68k_machtype); jeq lab 546#define is_mvme16x(lab) cmpl &MACH_MVME16x,%pc@(m68k_machtype); jeq lab 547#define is_bvme6000(lab) cmpl &MACH_BVME6000,%pc@(m68k_machtype); jeq lab 548#define is_not_hp300(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); jne lab 549#define is_not_apollo(lab) cmpl &MACH_APOLLO,%pc@(m68k_machtype); jne lab 550#define is_not_q40(lab) cmpl &MACH_Q40,%pc@(m68k_machtype); jne lab 551#define is_not_sun3x(lab) cmpl &MACH_SUN3X,%pc@(m68k_machtype); jne lab 552 553#define hasnt_leds(lab) cmpl &MACH_HP300,%pc@(m68k_machtype); \ 554 jeq 42f; \ 555 cmpl &MACH_APOLLO,%pc@(m68k_machtype); \ 556 jne lab ;\ 557 42:\ 558 559#define is_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jne lab 560#define is_not_040_or_060(lab) btst &CPUTYPE_0460,%pc@(L(cputype)+3); jeq lab 561#define is_040(lab) btst &CPUTYPE_040,%pc@(L(cputype)+3); jne lab 562#define is_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jne lab 563#define is_not_060(lab) btst &CPUTYPE_060,%pc@(L(cputype)+3); jeq lab 564#define is_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jne lab 565#define is_not_020(lab) btst &CPUTYPE_020,%pc@(L(cputype)+3); jeq lab 566 567/* On the HP300 we use the on-board LEDs for debug output before 568 the console is running. Writing a 1 bit turns the corresponding LED 569 _off_ - on the 340 bit 7 is towards the back panel of the machine. */ 570.macro leds mask 571#if defined(CONFIG_HP300) || defined(CONFIG_APOLLO) 572 hasnt_leds(.Lled\@) 573 pea \mask 574 func_call set_leds 575 addql #4,%sp 576.Lled\@: 577#endif 578.endm 579 580__HEAD 581ENTRY(_stext) 582/* 583 * Version numbers of the bootinfo interface 584 * The area from _stext to _start will later be used as kernel pointer table 585 */ 586 bras 1f /* Jump over bootinfo version numbers */ 587 588 .long BOOTINFOV_MAGIC 589 .long MACH_AMIGA, AMIGA_BOOTI_VERSION 590 .long MACH_ATARI, ATARI_BOOTI_VERSION 591 .long MACH_MVME147, MVME147_BOOTI_VERSION 592 .long MACH_MVME16x, MVME16x_BOOTI_VERSION 593 .long MACH_BVME6000, BVME6000_BOOTI_VERSION 594 .long MACH_MAC, MAC_BOOTI_VERSION 595 .long MACH_Q40, Q40_BOOTI_VERSION 596 .long MACH_HP300, HP300_BOOTI_VERSION 597 .long 0 5981: jra __start 599 600.equ kernel_pg_dir,_stext 601 602.equ .,_stext+PAGESIZE 603 604ENTRY(_start) 605 jra __start 606__INIT 607ENTRY(__start) 608/* 609 * Setup initial stack pointer 610 */ 611 lea %pc@(_stext),%sp 612 613/* 614 * Record the CPU and machine type. 615 */ 616 get_bi_record BI_MACHTYPE 617 lea %pc@(m68k_machtype),%a1 618 movel %a0@,%a1@ 619 620 get_bi_record BI_FPUTYPE 621 lea %pc@(m68k_fputype),%a1 622 movel %a0@,%a1@ 623 624 get_bi_record BI_MMUTYPE 625 lea %pc@(m68k_mmutype),%a1 626 movel %a0@,%a1@ 627 628 get_bi_record BI_CPUTYPE 629 lea %pc@(m68k_cputype),%a1 630 movel %a0@,%a1@ 631 632 leds 0x1 633 634#ifdef CONFIG_MAC 635/* 636 * For Macintosh, we need to determine the display parameters early (at least 637 * while debugging it). 638 */ 639 640 is_not_mac(L(test_notmac)) 641 642 get_bi_record BI_MAC_VADDR 643 lea %pc@(L(mac_videobase)),%a1 644 movel %a0@,%a1@ 645 646 get_bi_record BI_MAC_VDEPTH 647 lea %pc@(L(mac_videodepth)),%a1 648 movel %a0@,%a1@ 649 650 get_bi_record BI_MAC_VDIM 651 lea %pc@(L(mac_dimensions)),%a1 652 movel %a0@,%a1@ 653 654 get_bi_record BI_MAC_VROW 655 lea %pc@(L(mac_rowbytes)),%a1 656 movel %a0@,%a1@ 657 658#ifdef MAC_SERIAL_DEBUG 659 get_bi_record BI_MAC_SCCBASE 660 lea %pc@(L(mac_sccbase)),%a1 661 movel %a0@,%a1@ 662#endif /* MAC_SERIAL_DEBUG */ 663 664 665L(test_notmac): 666#endif /* CONFIG_MAC */ 667 668 669/* 670 * There are ultimately two pieces of information we want for all kinds of 671 * processors CpuType and CacheBits. The CPUTYPE was passed in from booter 672 * and is converted here from a booter type definition to a separate bit 673 * number which allows for the standard is_0x0 macro tests. 674 */ 675 movel %pc@(m68k_cputype),%d0 676 /* 677 * Assume it's an 030 678 */ 679 clrl %d1 680 681 /* 682 * Test the BootInfo cputype for 060 683 */ 684 btst #CPUB_68060,%d0 685 jeq 1f 686 bset #CPUTYPE_060,%d1 687 bset #CPUTYPE_0460,%d1 688 jra 3f 6891: 690 /* 691 * Test the BootInfo cputype for 040 692 */ 693 btst #CPUB_68040,%d0 694 jeq 2f 695 bset #CPUTYPE_040,%d1 696 bset #CPUTYPE_0460,%d1 697 jra 3f 6982: 699 /* 700 * Test the BootInfo cputype for 020 701 */ 702 btst #CPUB_68020,%d0 703 jeq 3f 704 bset #CPUTYPE_020,%d1 705 jra 3f 7063: 707 /* 708 * Record the cpu type 709 */ 710 lea %pc@(L(cputype)),%a0 711 movel %d1,%a0@ 712 713 /* 714 * NOTE: 715 * 716 * Now the macros are valid: 717 * is_040_or_060 718 * is_not_040_or_060 719 * is_040 720 * is_060 721 * is_not_060 722 */ 723 724 /* 725 * Determine the cache mode for pages holding MMU tables 726 * and for supervisor mode, unused for '020 and '030 727 */ 728 clrl %d0 729 clrl %d1 730 731 is_not_040_or_060(L(save_cachetype)) 732 733 /* 734 * '040 or '060 735 * d1 := cacheable write-through 736 * NOTE: The 68040 manual strongly recommends non-cached for MMU tables, 737 * but we have been using write-through since at least 2.0.29 so I 738 * guess it is OK. 739 */ 740#ifdef CONFIG_060_WRITETHROUGH 741 /* 742 * If this is a 68060 board using drivers with cache coherency 743 * problems, then supervisor memory accesses need to be write-through 744 * also; otherwise, we want copyback. 745 */ 746 747 is_not_060(1f) 748 movel #_PAGE_CACHE040W,%d0 749 jra L(save_cachetype) 750#endif /* CONFIG_060_WRITETHROUGH */ 7511: 752 movew #_PAGE_CACHE040,%d0 753 754 movel #_PAGE_CACHE040W,%d1 755 756L(save_cachetype): 757 /* Save cache mode for supervisor mode and page tables 758 */ 759 lea %pc@(m68k_supervisor_cachemode),%a0 760 movel %d0,%a0@ 761 lea %pc@(m68k_pgtable_cachemode),%a0 762 movel %d1,%a0@ 763 764/* 765 * raise interrupt level 766 */ 767 movew #0x2700,%sr 768 769/* 770 If running on an Atari, determine the I/O base of the 771 serial port and test if we are running on a Medusa or Hades. 772 This test is necessary here, because on the Hades the serial 773 port is only accessible in the high I/O memory area. 774 775 The test whether it is a Medusa is done by writing to the byte at 776 phys. 0x0. This should result in a bus error on all other machines. 777 778 ...should, but doesn't. The Afterburner040 for the Falcon has the 779 same behaviour (0x0..0x7 are no ROM shadow). So we have to do 780 another test to distinguish Medusa and AB040. This is a 781 read attempt for 0x00ff82fe phys. that should bus error on a Falcon 782 (+AB040), but is in the range where the Medusa always asserts DTACK. 783 784 The test for the Hades is done by reading address 0xb0000000. This 785 should give a bus error on the Medusa. 786 */ 787 788#ifdef CONFIG_ATARI 789 is_not_atari(L(notypetest)) 790 791 /* get special machine type (Medusa/Hades/AB40) */ 792 moveq #0,%d3 /* default if tag doesn't exist */ 793 get_bi_record BI_ATARI_MCH_TYPE 794 tstl %d0 795 jbmi 1f 796 movel %a0@,%d3 797 lea %pc@(atari_mch_type),%a0 798 movel %d3,%a0@ 7991: 800 /* On the Hades, the iobase must be set up before opening the 801 * serial port. There are no I/O regs at 0x00ffxxxx at all. */ 802 moveq #0,%d0 803 cmpl #ATARI_MACH_HADES,%d3 804 jbne 1f 805 movel #0xff000000,%d0 /* Hades I/O base addr: 0xff000000 */ 8061: lea %pc@(L(iobase)),%a0 807 movel %d0,%a0@ 808 809L(notypetest): 810#endif 811 812#ifdef CONFIG_VME 813 is_mvme147(L(getvmetype)) 814 is_bvme6000(L(getvmetype)) 815 is_not_mvme16x(L(gvtdone)) 816 817 /* See if the loader has specified the BI_VME_TYPE tag. Recent 818 * versions of VMELILO and TFTPLILO do this. We have to do this 819 * early so we know how to handle console output. If the tag 820 * doesn't exist then we use the Bug for output on MVME16x. 821 */ 822L(getvmetype): 823 get_bi_record BI_VME_TYPE 824 tstl %d0 825 jbmi 1f 826 movel %a0@,%d3 827 lea %pc@(vme_brdtype),%a0 828 movel %d3,%a0@ 8291: 830#ifdef CONFIG_MVME16x 831 is_not_mvme16x(L(gvtdone)) 832 833 /* Need to get the BRD_ID info to differentiate between 162, 167, 834 * etc. This is available as a BI_VME_BRDINFO tag with later 835 * versions of VMELILO and TFTPLILO, otherwise we call the Bug. 836 */ 837 get_bi_record BI_VME_BRDINFO 838 tstl %d0 839 jpl 1f 840 841 /* Get pointer to board ID data from Bug */ 842 movel %d2,%sp@- 843 trap #15 844 .word 0x70 /* trap 0x70 - .BRD_ID */ 845 movel %sp@+,%a0 8461: 847 lea %pc@(mvme_bdid),%a1 848 /* Structure is 32 bytes long */ 849 movel %a0@+,%a1@+ 850 movel %a0@+,%a1@+ 851 movel %a0@+,%a1@+ 852 movel %a0@+,%a1@+ 853 movel %a0@+,%a1@+ 854 movel %a0@+,%a1@+ 855 movel %a0@+,%a1@+ 856 movel %a0@+,%a1@+ 857#endif 858 859L(gvtdone): 860 861#endif 862 863#ifdef CONFIG_HP300 864 is_not_hp300(L(nothp)) 865 866 /* Get the address of the UART for serial debugging */ 867 get_bi_record BI_HP300_UART_ADDR 868 tstl %d0 869 jbmi 1f 870 movel %a0@,%d3 871 lea %pc@(L(uartbase)),%a0 872 movel %d3,%a0@ 873 get_bi_record BI_HP300_UART_SCODE 874 tstl %d0 875 jbmi 1f 876 movel %a0@,%d3 877 lea %pc@(L(uart_scode)),%a0 878 movel %d3,%a0@ 8791: 880L(nothp): 881#endif 882 883/* 884 * Initialize serial port 885 */ 886 jbsr L(serial_init) 887 888/* 889 * Initialize console 890 */ 891#ifdef CONFIG_MAC 892 is_not_mac(L(nocon)) 893#ifdef CONSOLE 894 console_init 895#ifdef CONSOLE_PENGUIN 896 console_put_penguin 897#endif /* CONSOLE_PENGUIN */ 898 console_put_stats 899#endif /* CONSOLE */ 900L(nocon): 901#endif /* CONFIG_MAC */ 902 903 904 putc '\n' 905 putc 'A' 906 leds 0x2 907 dputn %pc@(L(cputype)) 908 dputn %pc@(m68k_supervisor_cachemode) 909 dputn %pc@(m68k_pgtable_cachemode) 910 dputc '\n' 911 912/* 913 * Save physical start address of kernel 914 */ 915 lea %pc@(L(phys_kernel_start)),%a0 916 lea %pc@(_stext),%a1 917 subl #_stext,%a1 918 addl #PAGE_OFFSET,%a1 919 movel %a1,%a0@ 920 921 putc 'B' 922 923 leds 0x4 924 925/* 926 * mmu_init 927 * 928 * This block of code does what's necessary to map in the various kinds 929 * of machines for execution of Linux. 930 * First map the first 4 MB of kernel code & data 931 */ 932 933 mmu_map #PAGE_OFFSET,%pc@(L(phys_kernel_start)),#4*1024*1024,\ 934 %pc@(m68k_supervisor_cachemode) 935 936 putc 'C' 937 938#ifdef CONFIG_AMIGA 939 940L(mmu_init_amiga): 941 942 is_not_amiga(L(mmu_init_not_amiga)) 943/* 944 * mmu_init_amiga 945 */ 946 947 putc 'D' 948 949 is_not_040_or_060(1f) 950 951 /* 952 * 040: Map the 16Meg range physical 0x0 upto logical 0x8000.0000 953 */ 954 mmu_map #0x80000000,#0,#0x01000000,#_PAGE_NOCACHE_S 955 /* 956 * Map the Zorro III I/O space with transparent translation 957 * for frame buffer memory etc. 958 */ 959 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE_S 960 961 jbra L(mmu_init_done) 962 9631: 964 /* 965 * 030: Map the 32Meg range physical 0x0 upto logical 0x8000.0000 966 */ 967 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030 968 mmu_map_tt #1,#0x40000000,#0x20000000,#_PAGE_NOCACHE030 969 970 jbra L(mmu_init_done) 971 972L(mmu_init_not_amiga): 973#endif 974 975#ifdef CONFIG_ATARI 976 977L(mmu_init_atari): 978 979 is_not_atari(L(mmu_init_not_atari)) 980 981 putc 'E' 982 983/* On the Atari, we map the I/O region (phys. 0x00ffxxxx) by mapping 984 the last 16 MB of virtual address space to the first 16 MB (i.e. 985 0xffxxxxxx -> 0x00xxxxxx). For this, an additional pointer table is 986 needed. I/O ranges are marked non-cachable. 987 988 For the Medusa it is better to map the I/O region transparently 989 (i.e. 0xffxxxxxx -> 0xffxxxxxx), because some I/O registers are 990 accessible only in the high area. 991 992 On the Hades all I/O registers are only accessible in the high 993 area. 994*/ 995 996 /* I/O base addr for non-Medusa, non-Hades: 0x00000000 */ 997 moveq #0,%d0 998 movel %pc@(atari_mch_type),%d3 999 cmpl #ATARI_MACH_MEDUSA,%d3 1000 jbeq 2f 1001 cmpl #ATARI_MACH_HADES,%d3 1002 jbne 1f 10032: movel #0xff000000,%d0 /* Medusa/Hades base addr: 0xff000000 */ 10041: movel %d0,%d3 1005 1006 is_040_or_060(L(spata68040)) 1007 1008 /* Map everything non-cacheable, though not all parts really 1009 * need to disable caches (crucial only for 0xff8000..0xffffff 1010 * (standard I/O) and 0xf00000..0xf3ffff (IDE)). The remainder 1011 * isn't really used, except for sometimes peeking into the 1012 * ROMs (mirror at phys. 0x0), so caching isn't necessary for 1013 * this. */ 1014 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE030 1015 1016 jbra L(mmu_init_done) 1017 1018L(spata68040): 1019 1020 mmu_map #0xff000000,%d3,#0x01000000,#_PAGE_NOCACHE_S 1021 1022 jbra L(mmu_init_done) 1023 1024L(mmu_init_not_atari): 1025#endif 1026 1027#ifdef CONFIG_Q40 1028 is_not_q40(L(notq40)) 1029 /* 1030 * add transparent mapping for 0xff00 0000 - 0xffff ffff 1031 * non-cached serialized etc.. 1032 * this includes master chip, DAC, RTC and ISA ports 1033 * 0xfe000000-0xfeffffff is for screen and ROM 1034 */ 1035 1036 putc 'Q' 1037 1038 mmu_map_tt #0,#0xfe000000,#0x01000000,#_PAGE_CACHE040W 1039 mmu_map_tt #1,#0xff000000,#0x01000000,#_PAGE_NOCACHE_S 1040 1041 jbra L(mmu_init_done) 1042 1043L(notq40): 1044#endif 1045 1046#ifdef CONFIG_HP300 1047 is_not_hp300(L(nothp300)) 1048 1049 /* On the HP300, we map the ROM, INTIO and DIO regions (phys. 0x00xxxxxx) 1050 * by mapping 32MB (on 020/030) or 16 MB (on 040) from 0xf0xxxxxx -> 0x00xxxxxx). 1051 * The ROM mapping is needed because the LEDs are mapped there too. 1052 */ 1053 1054 is_040(1f) 1055 1056 /* 1057 * 030: Map the 32Meg range physical 0x0 upto logical 0xf000.0000 1058 */ 1059 mmu_map #0xf0000000,#0,#0x02000000,#_PAGE_NOCACHE030 1060 1061 jbra L(mmu_init_done) 1062 10631: 1064 /* 1065 * 040: Map the 16Meg range physical 0x0 upto logical 0xf000.0000 1066 */ 1067 mmu_map #0xf0000000,#0,#0x01000000,#_PAGE_NOCACHE_S 1068 1069 jbra L(mmu_init_done) 1070 1071L(nothp300): 1072#endif /* CONFIG_HP300 */ 1073 1074#ifdef CONFIG_MVME147 1075 1076 is_not_mvme147(L(not147)) 1077 1078 /* 1079 * On MVME147 we have already created kernel page tables for 1080 * 4MB of RAM at address 0, so now need to do a transparent 1081 * mapping of the top of memory space. Make it 0.5GByte for now, 1082 * so we can access on-board i/o areas. 1083 */ 1084 1085 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE030 1086 1087 jbra L(mmu_init_done) 1088 1089L(not147): 1090#endif /* CONFIG_MVME147 */ 1091 1092#ifdef CONFIG_MVME16x 1093 1094 is_not_mvme16x(L(not16x)) 1095 1096 /* 1097 * On MVME16x we have already created kernel page tables for 1098 * 4MB of RAM at address 0, so now need to do a transparent 1099 * mapping of the top of memory space. Make it 0.5GByte for now. 1100 * Supervisor only access, so transparent mapping doesn't 1101 * clash with User code virtual address space. 1102 * this covers IO devices, PROM and SRAM. The PROM and SRAM 1103 * mapping is needed to allow 167Bug to run. 1104 * IO is in the range 0xfff00000 to 0xfffeffff. 1105 * PROM is 0xff800000->0xffbfffff and SRAM is 1106 * 0xffe00000->0xffe1ffff. 1107 */ 1108 1109 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S 1110 1111 jbra L(mmu_init_done) 1112 1113L(not16x): 1114#endif /* CONFIG_MVME162 | CONFIG_MVME167 */ 1115 1116#ifdef CONFIG_BVME6000 1117 1118 is_not_bvme6000(L(not6000)) 1119 1120 /* 1121 * On BVME6000 we have already created kernel page tables for 1122 * 4MB of RAM at address 0, so now need to do a transparent 1123 * mapping of the top of memory space. Make it 0.5GByte for now, 1124 * so we can access on-board i/o areas. 1125 * Supervisor only access, so transparent mapping doesn't 1126 * clash with User code virtual address space. 1127 */ 1128 1129 mmu_map_tt #1,#0xe0000000,#0x20000000,#_PAGE_NOCACHE_S 1130 1131 jbra L(mmu_init_done) 1132 1133L(not6000): 1134#endif /* CONFIG_BVME6000 */ 1135 1136/* 1137 * mmu_init_mac 1138 * 1139 * The Macintosh mappings are less clear. 1140 * 1141 * Even as of this writing, it is unclear how the 1142 * Macintosh mappings will be done. However, as 1143 * the first author of this code I'm proposing the 1144 * following model: 1145 * 1146 * Map the kernel (that's already done), 1147 * Map the I/O (on most machines that's the 1148 * 0x5000.0000 ... 0x5300.0000 range, 1149 * Map the video frame buffer using as few pages 1150 * as absolutely (this requirement mostly stems from 1151 * the fact that when the frame buffer is at 1152 * 0x0000.0000 then we know there is valid RAM just 1153 * above the screen that we don't want to waste!). 1154 * 1155 * By the way, if the frame buffer is at 0x0000.0000 1156 * then the Macintosh is known as an RBV based Mac. 1157 * 1158 * By the way 2, the code currently maps in a bunch of 1159 * regions. But I'd like to cut that out. (And move most 1160 * of the mappings up into the kernel proper ... or only 1161 * map what's necessary.) 1162 */ 1163 1164#ifdef CONFIG_MAC 1165 1166L(mmu_init_mac): 1167 1168 is_not_mac(L(mmu_init_not_mac)) 1169 1170 putc 'F' 1171 1172 is_not_040_or_060(1f) 1173 1174 moveq #_PAGE_NOCACHE_S,%d3 1175 jbra 2f 11761: 1177 moveq #_PAGE_NOCACHE030,%d3 11782: 1179 /* 1180 * Mac Note: screen address of logical 0xF000.0000 -> <screen physical> 1181 * we simply map the 4MB that contains the videomem 1182 */ 1183 1184 movel #VIDEOMEMMASK,%d0 1185 andl %pc@(L(mac_videobase)),%d0 1186 1187 mmu_map #VIDEOMEMBASE,%d0,#VIDEOMEMSIZE,%d3 1188 /* ROM from 4000 0000 to 4200 0000 (only for mac_reset()) */ 1189 mmu_map_eq #0x40000000,#0x02000000,%d3 1190 /* IO devices (incl. serial port) from 5000 0000 to 5300 0000 */ 1191 mmu_map_eq #0x50000000,#0x03000000,%d3 1192 /* Nubus slot space (video at 0xF0000000, rom at 0xF0F80000) */ 1193 mmu_map_tt #1,#0xf8000000,#0x08000000,%d3 1194 1195 jbra L(mmu_init_done) 1196 1197L(mmu_init_not_mac): 1198#endif 1199 1200#ifdef CONFIG_SUN3X 1201 is_not_sun3x(L(notsun3x)) 1202 1203 /* oh, the pain.. We're gonna want the prom code after 1204 * starting the MMU, so we copy the mappings, translating 1205 * from 8k -> 4k pages as we go. 1206 */ 1207 1208 /* copy maps from 0xfee00000 to 0xff000000 */ 1209 movel #0xfee00000, %d0 1210 moveq #ROOT_INDEX_SHIFT, %d1 1211 lsrl %d1,%d0 1212 mmu_get_root_table_entry %d0 1213 1214 movel #0xfee00000, %d0 1215 moveq #PTR_INDEX_SHIFT, %d1 1216 lsrl %d1,%d0 1217 andl #PTR_TABLE_SIZE-1, %d0 1218 mmu_get_ptr_table_entry %a0,%d0 1219 1220 movel #0xfee00000, %d0 1221 moveq #PAGE_INDEX_SHIFT, %d1 1222 lsrl %d1,%d0 1223 andl #PAGE_TABLE_SIZE-1, %d0 1224 mmu_get_page_table_entry %a0,%d0 1225 1226 /* this is where the prom page table lives */ 1227 movel 0xfefe00d4, %a1 1228 movel %a1@, %a1 1229 1230 movel #((0x200000 >> 13)-1), %d1 1231 12321: 1233 movel %a1@+, %d3 1234 movel %d3,%a0@+ 1235 addl #0x1000,%d3 1236 movel %d3,%a0@+ 1237 1238 dbra %d1,1b 1239 1240 /* setup tt1 for I/O */ 1241 mmu_map_tt #1,#0x40000000,#0x40000000,#_PAGE_NOCACHE_S 1242 jbra L(mmu_init_done) 1243 1244L(notsun3x): 1245#endif 1246 1247#ifdef CONFIG_APOLLO 1248 is_not_apollo(L(notapollo)) 1249 1250 putc 'P' 1251 mmu_map #0x80000000,#0,#0x02000000,#_PAGE_NOCACHE030 1252 1253L(notapollo): 1254 jbra L(mmu_init_done) 1255#endif 1256 1257L(mmu_init_done): 1258 1259 putc 'G' 1260 leds 0x8 1261 1262/* 1263 * mmu_fixup 1264 * 1265 * On the 040 class machines, all pages that are used for the 1266 * mmu have to be fixed up. According to Motorola, pages holding mmu 1267 * tables should be non-cacheable on a '040 and write-through on a 1268 * '060. But analysis of the reasons for this, and practical 1269 * experience, showed that write-through also works on a '040. 1270 * 1271 * Allocated memory so far goes from kernel_end to memory_start that 1272 * is used for all kind of tables, for that the cache attributes 1273 * are now fixed. 1274 */ 1275L(mmu_fixup): 1276 1277 is_not_040_or_060(L(mmu_fixup_done)) 1278 1279#ifdef MMU_NOCACHE_KERNEL 1280 jbra L(mmu_fixup_done) 1281#endif 1282 1283 /* first fix the page at the start of the kernel, that 1284 * contains also kernel_pg_dir. 1285 */ 1286 movel %pc@(L(phys_kernel_start)),%d0 1287 subl #PAGE_OFFSET,%d0 1288 lea %pc@(_stext),%a0 1289 subl %d0,%a0 1290 mmu_fixup_page_mmu_cache %a0 1291 1292 movel %pc@(L(kernel_end)),%a0 1293 subl %d0,%a0 1294 movel %pc@(L(memory_start)),%a1 1295 subl %d0,%a1 1296 bra 2f 12971: 1298 mmu_fixup_page_mmu_cache %a0 1299 addw #PAGESIZE,%a0 13002: 1301 cmpl %a0,%a1 1302 jgt 1b 1303 1304L(mmu_fixup_done): 1305 1306#ifdef MMU_PRINT 1307 mmu_print 1308#endif 1309 1310/* 1311 * mmu_engage 1312 * 1313 * This chunk of code performs the gruesome task of engaging the MMU. 1314 * The reason its gruesome is because when the MMU becomes engaged it 1315 * maps logical addresses to physical addresses. The Program Counter 1316 * register is then passed through the MMU before the next instruction 1317 * is fetched (the instruction following the engage MMU instruction). 1318 * This may mean one of two things: 1319 * 1. The Program Counter falls within the logical address space of 1320 * the kernel of which there are two sub-possibilities: 1321 * A. The PC maps to the correct instruction (logical PC == physical 1322 * code location), or 1323 * B. The PC does not map through and the processor will read some 1324 * data (or instruction) which is not the logically next instr. 1325 * As you can imagine, A is good and B is bad. 1326 * Alternatively, 1327 * 2. The Program Counter does not map through the MMU. The processor 1328 * will take a Bus Error. 1329 * Clearly, 2 is bad. 1330 * It doesn't take a wiz kid to figure you want 1.A. 1331 * This code creates that possibility. 1332 * There are two possible 1.A. states (we now ignore the other above states): 1333 * A. The kernel is located at physical memory addressed the same as 1334 * the logical memory for the kernel, i.e., 0x01000. 1335 * B. The kernel is located some where else. e.g., 0x0400.0000 1336 * 1337 * Under some conditions the Macintosh can look like A or B. 1338 * [A friend and I once noted that Apple hardware engineers should be 1339 * wacked twice each day: once when they show up at work (as in, Whack!, 1340 * "This is for the screwy hardware we know you're going to design today."), 1341 * and also at the end of the day (as in, Whack! "I don't know what 1342 * you designed today, but I'm sure it wasn't good."). -- rst] 1343 * 1344 * This code works on the following premise: 1345 * If the kernel start (%d5) is within the first 16 Meg of RAM, 1346 * then create a mapping for the kernel at logical 0x8000.0000 to 1347 * the physical location of the pc. And, create a transparent 1348 * translation register for the first 16 Meg. Then, after the MMU 1349 * is engaged, the PC can be moved up into the 0x8000.0000 range 1350 * and then the transparent translation can be turned off and then 1351 * the PC can jump to the correct logical location and it will be 1352 * home (finally). This is essentially the code that the Amiga used 1353 * to use. Now, it's generalized for all processors. Which means 1354 * that a fresh (but temporary) mapping has to be created. The mapping 1355 * is made in page 0 (an as of yet unused location -- except for the 1356 * stack!). This temporary mapping will only require 1 pointer table 1357 * and a single page table (it can map 256K). 1358 * 1359 * OK, alternatively, imagine that the Program Counter is not within 1360 * the first 16 Meg. Then, just use Transparent Translation registers 1361 * to do the right thing. 1362 * 1363 * Last, if _start is already at 0x01000, then there's nothing special 1364 * to do (in other words, in a degenerate case of the first case above, 1365 * do nothing). 1366 * 1367 * Let's do it. 1368 * 1369 * 1370 */ 1371 1372 putc 'H' 1373 1374 mmu_engage 1375 1376/* 1377 * After this point no new memory is allocated and 1378 * the start of available memory is stored in availmem. 1379 * (The bootmem allocator requires now the physicall address.) 1380 */ 1381 1382 movel L(memory_start),availmem 1383 1384#ifdef CONFIG_AMIGA 1385 is_not_amiga(1f) 1386 /* fixup the Amiga custom register location before printing */ 1387 clrl L(custom) 13881: 1389#endif 1390 1391#ifdef CONFIG_ATARI 1392 is_not_atari(1f) 1393 /* fixup the Atari iobase register location before printing */ 1394 movel #0xff000000,L(iobase) 13951: 1396#endif 1397 1398#ifdef CONFIG_MAC 1399 is_not_mac(1f) 1400 movel #~VIDEOMEMMASK,%d0 1401 andl L(mac_videobase),%d0 1402 addl #VIDEOMEMBASE,%d0 1403 movel %d0,L(mac_videobase) 1404#if defined(CONSOLE) 1405 movel %pc@(L(phys_kernel_start)),%d0 1406 subl #PAGE_OFFSET,%d0 1407 subl %d0,L(console_font) 1408 subl %d0,L(console_font_data) 1409#endif 1410#ifdef MAC_SERIAL_DEBUG 1411 orl #0x50000000,L(mac_sccbase) 1412#endif 14131: 1414#endif 1415 1416#ifdef CONFIG_HP300 1417 is_not_hp300(2f) 1418 /* 1419 * Fix up the iobase register to point to the new location of the LEDs. 1420 */ 1421 movel #0xf0000000,L(iobase) 1422 1423 /* 1424 * Energise the FPU and caches. 1425 */ 1426 is_040(1f) 1427 movel #0x60,0xf05f400c 1428 jbra 2f 1429 1430 /* 1431 * 040: slightly different, apparently. 1432 */ 14331: movew #0,0xf05f400e 1434 movew #0x64,0xf05f400e 14352: 1436#endif 1437 1438#ifdef CONFIG_SUN3X 1439 is_not_sun3x(1f) 1440 1441 /* enable copro */ 1442 oriw #0x4000,0x61000000 14431: 1444#endif 1445 1446#ifdef CONFIG_APOLLO 1447 is_not_apollo(1f) 1448 1449 /* 1450 * Fix up the iobase before printing 1451 */ 1452 movel #0x80000000,L(iobase) 14531: 1454#endif 1455 1456 putc 'I' 1457 leds 0x10 1458 1459/* 1460 * Enable caches 1461 */ 1462 1463 is_not_040_or_060(L(cache_not_680460)) 1464 1465L(cache680460): 1466 .chip 68040 1467 nop 1468 cpusha %bc 1469 nop 1470 1471 is_060(L(cache68060)) 1472 1473 movel #CC6_ENABLE_D+CC6_ENABLE_I,%d0 1474 /* MMU stuff works in copyback mode now, so enable the cache */ 1475 movec %d0,%cacr 1476 jra L(cache_done) 1477 1478L(cache68060): 1479 movel #CC6_ENABLE_D+CC6_ENABLE_I+CC6_ENABLE_SB+CC6_PUSH_DPI+CC6_ENABLE_B+CC6_CLRA_B,%d0 1480 /* MMU stuff works in copyback mode now, so enable the cache */ 1481 movec %d0,%cacr 1482 /* enable superscalar dispatch in PCR */ 1483 moveq #1,%d0 1484 .chip 68060 1485 movec %d0,%pcr 1486 1487 jbra L(cache_done) 1488L(cache_not_680460): 1489L(cache68030): 1490 .chip 68030 1491 movel #CC3_ENABLE_DB+CC3_CLR_D+CC3_ENABLE_D+CC3_ENABLE_IB+CC3_CLR_I+CC3_ENABLE_I,%d0 1492 movec %d0,%cacr 1493 1494 jra L(cache_done) 1495 .chip 68k 1496L(cache_done): 1497 1498 putc 'J' 1499 1500/* 1501 * Setup initial stack pointer 1502 */ 1503 lea init_task,%curptr 1504 lea init_thread_union+THREAD_SIZE,%sp 1505 1506 putc 'K' 1507 1508 subl %a6,%a6 /* clear a6 for gdb */ 1509 1510/* 1511 * The new 64bit printf support requires an early exception initialization. 1512 */ 1513 jbsr base_trap_init 1514 1515/* jump to the kernel start */ 1516 1517 putc '\n' 1518 leds 0x55 1519 1520 jbsr start_kernel 1521 1522/* 1523 * Find a tag record in the bootinfo structure 1524 * The bootinfo structure is located right after the kernel bss 1525 * Returns: d0: size (-1 if not found) 1526 * a0: data pointer (end-of-records if not found) 1527 */ 1528func_start get_bi_record,%d1 1529 1530 movel ARG1,%d0 1531 lea %pc@(_end),%a0 15321: tstw %a0@(BIR_TAG) 1533 jeq 3f 1534 cmpw %a0@(BIR_TAG),%d0 1535 jeq 2f 1536 addw %a0@(BIR_SIZE),%a0 1537 jra 1b 15382: moveq #0,%d0 1539 movew %a0@(BIR_SIZE),%d0 1540 lea %a0@(BIR_DATA),%a0 1541 jra 4f 15423: moveq #-1,%d0 1543 lea %a0@(BIR_SIZE),%a0 15444: 1545func_return get_bi_record 1546 1547 1548/* 1549 * MMU Initialization Begins Here 1550 * 1551 * The structure of the MMU tables on the 68k machines 1552 * is thus: 1553 * Root Table 1554 * Logical addresses are translated through 1555 * a hierarchical translation mechanism where the high-order 1556 * seven bits of the logical address (LA) are used as an 1557 * index into the "root table." Each entry in the root 1558 * table has a bit which specifies if it's a valid pointer to a 1559 * pointer table. Each entry defines a 32KMeg range of memory. 1560 * If an entry is invalid then that logical range of 32M is 1561 * invalid and references to that range of memory (when the MMU 1562 * is enabled) will fault. If the entry is valid, then it does 1563 * one of two things. On 040/060 class machines, it points to 1564 * a pointer table which then describes more finely the memory 1565 * within that 32M range. On 020/030 class machines, a technique 1566 * called "early terminating descriptors" are used. This technique 1567 * allows an entire 32Meg to be described by a single entry in the 1568 * root table. Thus, this entry in the root table, contains the 1569 * physical address of the memory or I/O at the logical address 1570 * which the entry represents and it also contains the necessary 1571 * cache bits for this region. 1572 * 1573 * Pointer Tables 1574 * Per the Root Table, there will be one or more 1575 * pointer tables. Each pointer table defines a 32M range. 1576 * Not all of the 32M range need be defined. Again, the next 1577 * seven bits of the logical address are used an index into 1578 * the pointer table to point to page tables (if the pointer 1579 * is valid). There will undoubtedly be more than one 1580 * pointer table for the kernel because each pointer table 1581 * defines a range of only 32M. Valid pointer table entries 1582 * point to page tables, or are early terminating entries 1583 * themselves. 1584 * 1585 * Page Tables 1586 * Per the Pointer Tables, each page table entry points 1587 * to the physical page in memory that supports the logical 1588 * address that translates to the particular index. 1589 * 1590 * In short, the Logical Address gets translated as follows: 1591 * bits 31..26 - index into the Root Table 1592 * bits 25..18 - index into the Pointer Table 1593 * bits 17..12 - index into the Page Table 1594 * bits 11..0 - offset into a particular 4K page 1595 * 1596 * The algorithms which follows do one thing: they abstract 1597 * the MMU hardware. For example, there are three kinds of 1598 * cache settings that are relevant. Either, memory is 1599 * being mapped in which case it is either Kernel Code (or 1600 * the RamDisk) or it is MMU data. On the 030, the MMU data 1601 * option also describes the kernel. Or, I/O is being mapped 1602 * in which case it has its own kind of cache bits. There 1603 * are constants which abstract these notions from the code that 1604 * actually makes the call to map some range of memory. 1605 * 1606 * 1607 * 1608 */ 1609 1610#ifdef MMU_PRINT 1611/* 1612 * mmu_print 1613 * 1614 * This algorithm will print out the current MMU mappings. 1615 * 1616 * Input: 1617 * %a5 points to the root table. Everything else is calculated 1618 * from this. 1619 */ 1620 1621#define mmu_next_valid 0 1622#define mmu_start_logical 4 1623#define mmu_next_logical 8 1624#define mmu_start_physical 12 1625#define mmu_next_physical 16 1626 1627#define MMU_PRINT_INVALID -1 1628#define MMU_PRINT_VALID 1 1629#define MMU_PRINT_UNINITED 0 1630 1631#define putZc(z,n) jbne 1f; putc z; jbra 2f; 1: putc n; 2: 1632 1633func_start mmu_print,%a0-%a6/%d0-%d7 1634 1635 movel %pc@(L(kernel_pgdir_ptr)),%a5 1636 lea %pc@(L(mmu_print_data)),%a0 1637 movel #MMU_PRINT_UNINITED,%a0@(mmu_next_valid) 1638 1639 is_not_040_or_060(mmu_030_print) 1640 1641mmu_040_print: 1642 puts "\nMMU040\n" 1643 puts "rp:" 1644 putn %a5 1645 putc '\n' 1646 1647 lea %pc@(kernel_pg_dir),%a5 1648 movel %a5,%a0 /* a0 has the address of the root table ptr */ 1649 movel #0x00000000,%a4 /* logical address */ 1650 moveql #0,%d0 165140: 1652 /* Increment the logical address and preserve in d5 */ 1653 movel %a4,%d5 1654 addil #PAGESIZE<<13,%d5 1655 movel %a0@+,%d6 1656 btst #1,%d6 1657 jbne 41f 1658 jbsr mmu_print_tuple_invalidate 1659 jbra 48f 166041: 1661 movel #0,%d1 1662 andil #0xfffffe00,%d6 1663 movel %d6,%a1 166442: 1665 movel %a4,%d5 1666 addil #PAGESIZE<<6,%d5 1667 movel %a1@+,%d6 1668 btst #1,%d6 1669 jbne 43f 1670 jbsr mmu_print_tuple_invalidate 1671 jbra 47f 167243: 1673 movel #0,%d2 1674 andil #0xffffff00,%d6 1675 movel %d6,%a2 167644: 1677 movel %a4,%d5 1678 addil #PAGESIZE,%d5 1679 movel %a2@+,%d6 1680 btst #0,%d6 1681 jbne 45f 1682 jbsr mmu_print_tuple_invalidate 1683 jbra 46f 168445: 1685 moveml %d0-%d1,%sp@- 1686 movel %a4,%d0 1687 movel %d6,%d1 1688 andil #0xfffff4e0,%d1 1689 lea %pc@(mmu_040_print_flags),%a6 1690 jbsr mmu_print_tuple 1691 moveml %sp@+,%d0-%d1 169246: 1693 movel %d5,%a4 1694 addq #1,%d2 1695 cmpib #64,%d2 1696 jbne 44b 169747: 1698 movel %d5,%a4 1699 addq #1,%d1 1700 cmpib #128,%d1 1701 jbne 42b 170248: 1703 movel %d5,%a4 /* move to the next logical address */ 1704 addq #1,%d0 1705 cmpib #128,%d0 1706 jbne 40b 1707 1708 .chip 68040 1709 movec %dtt1,%d0 1710 movel %d0,%d1 1711 andiw #0x8000,%d1 /* is it valid ? */ 1712 jbeq 1f /* No, bail out */ 1713 1714 movel %d0,%d1 1715 andil #0xff000000,%d1 /* Get the address */ 1716 putn %d1 1717 puts "==" 1718 putn %d1 1719 1720 movel %d0,%d6 1721 jbsr mmu_040_print_flags_tt 17221: 1723 movec %dtt0,%d0 1724 movel %d0,%d1 1725 andiw #0x8000,%d1 /* is it valid ? */ 1726 jbeq 1f /* No, bail out */ 1727 1728 movel %d0,%d1 1729 andil #0xff000000,%d1 /* Get the address */ 1730 putn %d1 1731 puts "==" 1732 putn %d1 1733 1734 movel %d0,%d6 1735 jbsr mmu_040_print_flags_tt 17361: 1737 .chip 68k 1738 1739 jbra mmu_print_done 1740 1741mmu_040_print_flags: 1742 btstl #10,%d6 1743 putZc(' ','G') /* global bit */ 1744 btstl #7,%d6 1745 putZc(' ','S') /* supervisor bit */ 1746mmu_040_print_flags_tt: 1747 btstl #6,%d6 1748 jbne 3f 1749 putc 'C' 1750 btstl #5,%d6 1751 putZc('w','c') /* write through or copy-back */ 1752 jbra 4f 17533: 1754 putc 'N' 1755 btstl #5,%d6 1756 putZc('s',' ') /* serialized non-cacheable, or non-cacheable */ 17574: 1758 rts 1759 1760mmu_030_print_flags: 1761 btstl #6,%d6 1762 putZc('C','I') /* write through or copy-back */ 1763 rts 1764 1765mmu_030_print: 1766 puts "\nMMU030\n" 1767 puts "\nrp:" 1768 putn %a5 1769 putc '\n' 1770 movel %a5,%d0 1771 andil #0xfffffff0,%d0 1772 movel %d0,%a0 1773 movel #0x00000000,%a4 /* logical address */ 1774 movel #0,%d0 177530: 1776 movel %a4,%d5 1777 addil #PAGESIZE<<13,%d5 1778 movel %a0@+,%d6 1779 btst #1,%d6 /* is it a table ptr? */ 1780 jbne 31f /* yes */ 1781 btst #0,%d6 /* is it early terminating? */ 1782 jbeq 1f /* no */ 1783 jbsr mmu_030_print_helper 1784 jbra 38f 17851: 1786 jbsr mmu_print_tuple_invalidate 1787 jbra 38f 178831: 1789 movel #0,%d1 1790 andil #0xfffffff0,%d6 1791 movel %d6,%a1 179232: 1793 movel %a4,%d5 1794 addil #PAGESIZE<<6,%d5 1795 movel %a1@+,%d6 1796 btst #1,%d6 /* is it a table ptr? */ 1797 jbne 33f /* yes */ 1798 btst #0,%d6 /* is it a page descriptor? */ 1799 jbeq 1f /* no */ 1800 jbsr mmu_030_print_helper 1801 jbra 37f 18021: 1803 jbsr mmu_print_tuple_invalidate 1804 jbra 37f 180533: 1806 movel #0,%d2 1807 andil #0xfffffff0,%d6 1808 movel %d6,%a2 180934: 1810 movel %a4,%d5 1811 addil #PAGESIZE,%d5 1812 movel %a2@+,%d6 1813 btst #0,%d6 1814 jbne 35f 1815 jbsr mmu_print_tuple_invalidate 1816 jbra 36f 181735: 1818 jbsr mmu_030_print_helper 181936: 1820 movel %d5,%a4 1821 addq #1,%d2 1822 cmpib #64,%d2 1823 jbne 34b 182437: 1825 movel %d5,%a4 1826 addq #1,%d1 1827 cmpib #128,%d1 1828 jbne 32b 182938: 1830 movel %d5,%a4 /* move to the next logical address */ 1831 addq #1,%d0 1832 cmpib #128,%d0 1833 jbne 30b 1834 1835mmu_print_done: 1836 puts "\n\n" 1837 1838func_return mmu_print 1839 1840 1841mmu_030_print_helper: 1842 moveml %d0-%d1,%sp@- 1843 movel %a4,%d0 1844 movel %d6,%d1 1845 lea %pc@(mmu_030_print_flags),%a6 1846 jbsr mmu_print_tuple 1847 moveml %sp@+,%d0-%d1 1848 rts 1849 1850mmu_print_tuple_invalidate: 1851 moveml %a0/%d7,%sp@- 1852 1853 lea %pc@(L(mmu_print_data)),%a0 1854 tstl %a0@(mmu_next_valid) 1855 jbmi mmu_print_tuple_invalidate_exit 1856 1857 movel #MMU_PRINT_INVALID,%a0@(mmu_next_valid) 1858 1859 putn %a4 1860 1861 puts "##\n" 1862 1863mmu_print_tuple_invalidate_exit: 1864 moveml %sp@+,%a0/%d7 1865 rts 1866 1867 1868mmu_print_tuple: 1869 moveml %d0-%d7/%a0,%sp@- 1870 1871 lea %pc@(L(mmu_print_data)),%a0 1872 1873 tstl %a0@(mmu_next_valid) 1874 jble mmu_print_tuple_print 1875 1876 cmpl %a0@(mmu_next_physical),%d1 1877 jbeq mmu_print_tuple_increment 1878 1879mmu_print_tuple_print: 1880 putn %d0 1881 puts "->" 1882 putn %d1 1883 1884 movel %d1,%d6 1885 jbsr %a6@ 1886 1887mmu_print_tuple_record: 1888 movel #MMU_PRINT_VALID,%a0@(mmu_next_valid) 1889 1890 movel %d1,%a0@(mmu_next_physical) 1891 1892mmu_print_tuple_increment: 1893 movel %d5,%d7 1894 subl %a4,%d7 1895 addl %d7,%a0@(mmu_next_physical) 1896 1897mmu_print_tuple_exit: 1898 moveml %sp@+,%d0-%d7/%a0 1899 rts 1900 1901mmu_print_machine_cpu_types: 1902 puts "machine: " 1903 1904 is_not_amiga(1f) 1905 puts "amiga" 1906 jbra 9f 19071: 1908 is_not_atari(2f) 1909 puts "atari" 1910 jbra 9f 19112: 1912 is_not_mac(3f) 1913 puts "macintosh" 1914 jbra 9f 19153: puts "unknown" 19169: putc '\n' 1917 1918 puts "cputype: 0" 1919 is_not_060(1f) 1920 putc '6' 1921 jbra 9f 19221: 1923 is_not_040_or_060(2f) 1924 putc '4' 1925 jbra 9f 19262: putc '3' 19279: putc '0' 1928 putc '\n' 1929 1930 rts 1931#endif /* MMU_PRINT */ 1932 1933/* 1934 * mmu_map_tt 1935 * 1936 * This is a specific function which works on all 680x0 machines. 1937 * On 030, 040 & 060 it will attempt to use Transparent Translation 1938 * registers (tt1). 1939 * On 020 it will call the standard mmu_map which will use early 1940 * terminating descriptors. 1941 */ 1942func_start mmu_map_tt,%d0/%d1/%a0,4 1943 1944 dputs "mmu_map_tt:" 1945 dputn ARG1 1946 dputn ARG2 1947 dputn ARG3 1948 dputn ARG4 1949 dputc '\n' 1950 1951 is_020(L(do_map)) 1952 1953 /* Extract the highest bit set 1954 */ 1955 bfffo ARG3{#0,#32},%d1 1956 cmpw #8,%d1 1957 jcc L(do_map) 1958 1959 /* And get the mask 1960 */ 1961 moveq #-1,%d0 1962 lsrl %d1,%d0 1963 lsrl #1,%d0 1964 1965 /* Mask the address 1966 */ 1967 movel %d0,%d1 1968 notl %d1 1969 andl ARG2,%d1 1970 1971 /* Generate the upper 16bit of the tt register 1972 */ 1973 lsrl #8,%d0 1974 orl %d0,%d1 1975 clrw %d1 1976 1977 is_040_or_060(L(mmu_map_tt_040)) 1978 1979 /* set 030 specific bits (read/write access for supervisor mode 1980 * (highest function code set, lower two bits masked)) 1981 */ 1982 orw #TTR_ENABLE+TTR_RWM+TTR_FCB2+TTR_FCM1+TTR_FCM0,%d1 1983 movel ARG4,%d0 1984 btst #6,%d0 1985 jeq 1f 1986 orw #TTR_CI,%d1 1987 19881: lea STACK,%a0 1989 dputn %d1 1990 movel %d1,%a0@ 1991 .chip 68030 1992 tstl ARG1 1993 jne 1f 1994 pmove %a0@,%tt0 1995 jra 2f 19961: pmove %a0@,%tt1 19972: .chip 68k 1998 jra L(mmu_map_tt_done) 1999 2000 /* set 040 specific bits 2001 */ 2002L(mmu_map_tt_040): 2003 orw #TTR_ENABLE+TTR_KERNELMODE,%d1 2004 orl ARG4,%d1 2005 dputn %d1 2006 2007 .chip 68040 2008 tstl ARG1 2009 jne 1f 2010 movec %d1,%itt0 2011 movec %d1,%dtt0 2012 jra 2f 20131: movec %d1,%itt1 2014 movec %d1,%dtt1 20152: .chip 68k 2016 2017 jra L(mmu_map_tt_done) 2018 2019L(do_map): 2020 mmu_map_eq ARG2,ARG3,ARG4 2021 2022L(mmu_map_tt_done): 2023 2024func_return mmu_map_tt 2025 2026/* 2027 * mmu_map 2028 * 2029 * This routine will map a range of memory using a pointer 2030 * table and allocating the pages on the fly from the kernel. 2031 * The pointer table does not have to be already linked into 2032 * the root table, this routine will do that if necessary. 2033 * 2034 * NOTE 2035 * This routine will assert failure and use the serial_putc 2036 * routines in the case of a run-time error. For example, 2037 * if the address is already mapped. 2038 * 2039 * NOTE-2 2040 * This routine will use early terminating descriptors 2041 * where possible for the 68020+68851 and 68030 type 2042 * processors. 2043 */ 2044func_start mmu_map,%d0-%d4/%a0-%a4 2045 2046 dputs "\nmmu_map:" 2047 dputn ARG1 2048 dputn ARG2 2049 dputn ARG3 2050 dputn ARG4 2051 dputc '\n' 2052 2053 /* Get logical address and round it down to 256KB 2054 */ 2055 movel ARG1,%d0 2056 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0 2057 movel %d0,%a3 2058 2059 /* Get the end address 2060 */ 2061 movel ARG1,%a4 2062 addl ARG3,%a4 2063 subql #1,%a4 2064 2065 /* Get physical address and round it down to 256KB 2066 */ 2067 movel ARG2,%d0 2068 andl #-(PAGESIZE*PAGE_TABLE_SIZE),%d0 2069 movel %d0,%a2 2070 2071 /* Add page attributes to the physical address 2072 */ 2073 movel ARG4,%d0 2074 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0 2075 addw %d0,%a2 2076 2077 dputn %a2 2078 dputn %a3 2079 dputn %a4 2080 2081 is_not_040_or_060(L(mmu_map_030)) 2082 2083 addw #_PAGE_GLOBAL040,%a2 2084/* 2085 * MMU 040 & 060 Support 2086 * 2087 * The MMU usage for the 040 and 060 is different enough from 2088 * the 030 and 68851 that there is separate code. This comment 2089 * block describes the data structures and algorithms built by 2090 * this code. 2091 * 2092 * The 040 does not support early terminating descriptors, as 2093 * the 030 does. Therefore, a third level of table is needed 2094 * for the 040, and that would be the page table. In Linux, 2095 * page tables are allocated directly from the memory above the 2096 * kernel. 2097 * 2098 */ 2099 2100L(mmu_map_040): 2101 /* Calculate the offset into the root table 2102 */ 2103 movel %a3,%d0 2104 moveq #ROOT_INDEX_SHIFT,%d1 2105 lsrl %d1,%d0 2106 mmu_get_root_table_entry %d0 2107 2108 /* Calculate the offset into the pointer table 2109 */ 2110 movel %a3,%d0 2111 moveq #PTR_INDEX_SHIFT,%d1 2112 lsrl %d1,%d0 2113 andl #PTR_TABLE_SIZE-1,%d0 2114 mmu_get_ptr_table_entry %a0,%d0 2115 2116 /* Calculate the offset into the page table 2117 */ 2118 movel %a3,%d0 2119 moveq #PAGE_INDEX_SHIFT,%d1 2120 lsrl %d1,%d0 2121 andl #PAGE_TABLE_SIZE-1,%d0 2122 mmu_get_page_table_entry %a0,%d0 2123 2124 /* The page table entry must not no be busy 2125 */ 2126 tstl %a0@ 2127 jne L(mmu_map_error) 2128 2129 /* Do the mapping and advance the pointers 2130 */ 2131 movel %a2,%a0@ 21322: 2133 addw #PAGESIZE,%a2 2134 addw #PAGESIZE,%a3 2135 2136 /* Ready with mapping? 2137 */ 2138 lea %a3@(-1),%a0 2139 cmpl %a0,%a4 2140 jhi L(mmu_map_040) 2141 jra L(mmu_map_done) 2142 2143L(mmu_map_030): 2144 /* Calculate the offset into the root table 2145 */ 2146 movel %a3,%d0 2147 moveq #ROOT_INDEX_SHIFT,%d1 2148 lsrl %d1,%d0 2149 mmu_get_root_table_entry %d0 2150 2151 /* Check if logical address 32MB aligned, 2152 * so we can try to map it once 2153 */ 2154 movel %a3,%d0 2155 andl #(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1)&(-ROOT_TABLE_SIZE),%d0 2156 jne 1f 2157 2158 /* Is there enough to map for 32MB at once 2159 */ 2160 lea %a3@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE-1),%a1 2161 cmpl %a1,%a4 2162 jcs 1f 2163 2164 addql #1,%a1 2165 2166 /* The root table entry must not no be busy 2167 */ 2168 tstl %a0@ 2169 jne L(mmu_map_error) 2170 2171 /* Do the mapping and advance the pointers 2172 */ 2173 dputs "early term1" 2174 dputn %a2 2175 dputn %a3 2176 dputn %a1 2177 dputc '\n' 2178 movel %a2,%a0@ 2179 2180 movel %a1,%a3 2181 lea %a2@(PTR_TABLE_SIZE*PAGE_TABLE_SIZE*PAGESIZE),%a2 2182 jra L(mmu_mapnext_030) 21831: 2184 /* Calculate the offset into the pointer table 2185 */ 2186 movel %a3,%d0 2187 moveq #PTR_INDEX_SHIFT,%d1 2188 lsrl %d1,%d0 2189 andl #PTR_TABLE_SIZE-1,%d0 2190 mmu_get_ptr_table_entry %a0,%d0 2191 2192 /* The pointer table entry must not no be busy 2193 */ 2194 tstl %a0@ 2195 jne L(mmu_map_error) 2196 2197 /* Do the mapping and advance the pointers 2198 */ 2199 dputs "early term2" 2200 dputn %a2 2201 dputn %a3 2202 dputc '\n' 2203 movel %a2,%a0@ 2204 2205 addl #PAGE_TABLE_SIZE*PAGESIZE,%a2 2206 addl #PAGE_TABLE_SIZE*PAGESIZE,%a3 2207 2208L(mmu_mapnext_030): 2209 /* Ready with mapping? 2210 */ 2211 lea %a3@(-1),%a0 2212 cmpl %a0,%a4 2213 jhi L(mmu_map_030) 2214 jra L(mmu_map_done) 2215 2216L(mmu_map_error): 2217 2218 dputs "mmu_map error:" 2219 dputn %a2 2220 dputn %a3 2221 dputc '\n' 2222 2223L(mmu_map_done): 2224 2225func_return mmu_map 2226 2227/* 2228 * mmu_fixup 2229 * 2230 * On the 040 class machines, all pages that are used for the 2231 * mmu have to be fixed up. 2232 */ 2233 2234func_start mmu_fixup_page_mmu_cache,%d0/%a0 2235 2236 dputs "mmu_fixup_page_mmu_cache" 2237 dputn ARG1 2238 2239 /* Calculate the offset into the root table 2240 */ 2241 movel ARG1,%d0 2242 moveq #ROOT_INDEX_SHIFT,%d1 2243 lsrl %d1,%d0 2244 mmu_get_root_table_entry %d0 2245 2246 /* Calculate the offset into the pointer table 2247 */ 2248 movel ARG1,%d0 2249 moveq #PTR_INDEX_SHIFT,%d1 2250 lsrl %d1,%d0 2251 andl #PTR_TABLE_SIZE-1,%d0 2252 mmu_get_ptr_table_entry %a0,%d0 2253 2254 /* Calculate the offset into the page table 2255 */ 2256 movel ARG1,%d0 2257 moveq #PAGE_INDEX_SHIFT,%d1 2258 lsrl %d1,%d0 2259 andl #PAGE_TABLE_SIZE-1,%d0 2260 mmu_get_page_table_entry %a0,%d0 2261 2262 movel %a0@,%d0 2263 andil #_CACHEMASK040,%d0 2264 orl %pc@(m68k_pgtable_cachemode),%d0 2265 movel %d0,%a0@ 2266 2267 dputc '\n' 2268 2269func_return mmu_fixup_page_mmu_cache 2270 2271/* 2272 * mmu_temp_map 2273 * 2274 * create a temporary mapping to enable the mmu, 2275 * this we don't need any transparation translation tricks. 2276 */ 2277 2278func_start mmu_temp_map,%d0/%d1/%a0/%a1 2279 2280 dputs "mmu_temp_map" 2281 dputn ARG1 2282 dputn ARG2 2283 dputc '\n' 2284 2285 lea %pc@(L(temp_mmap_mem)),%a1 2286 2287 /* Calculate the offset in the root table 2288 */ 2289 movel ARG2,%d0 2290 moveq #ROOT_INDEX_SHIFT,%d1 2291 lsrl %d1,%d0 2292 mmu_get_root_table_entry %d0 2293 2294 /* Check if the table is temporary allocated, so we have to reuse it 2295 */ 2296 movel %a0@,%d0 2297 cmpl %pc@(L(memory_start)),%d0 2298 jcc 1f 2299 2300 /* Temporary allocate a ptr table and insert it into the root table 2301 */ 2302 movel %a1@,%d0 2303 addl #PTR_TABLE_SIZE*4,%a1@ 2304 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0 2305 movel %d0,%a0@ 2306 dputs " (new)" 23071: 2308 dputn %d0 2309 /* Mask the root table entry for the ptr table 2310 */ 2311 andw #-ROOT_TABLE_SIZE,%d0 2312 movel %d0,%a0 2313 2314 /* Calculate the offset into the pointer table 2315 */ 2316 movel ARG2,%d0 2317 moveq #PTR_INDEX_SHIFT,%d1 2318 lsrl %d1,%d0 2319 andl #PTR_TABLE_SIZE-1,%d0 2320 lea %a0@(%d0*4),%a0 2321 dputn %a0 2322 2323 /* Check if a temporary page table is already allocated 2324 */ 2325 movel %a0@,%d0 2326 jne 1f 2327 2328 /* Temporary allocate a page table and insert it into the ptr table 2329 */ 2330 movel %a1@,%d0 2331 /* The 512 should be PAGE_TABLE_SIZE*4, but that violates the 2332 alignment restriction for pointer tables on the '0[46]0. */ 2333 addl #512,%a1@ 2334 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0 2335 movel %d0,%a0@ 2336 dputs " (new)" 23371: 2338 dputn %d0 2339 /* Mask the ptr table entry for the page table 2340 */ 2341 andw #-PTR_TABLE_SIZE,%d0 2342 movel %d0,%a0 2343 2344 /* Calculate the offset into the page table 2345 */ 2346 movel ARG2,%d0 2347 moveq #PAGE_INDEX_SHIFT,%d1 2348 lsrl %d1,%d0 2349 andl #PAGE_TABLE_SIZE-1,%d0 2350 lea %a0@(%d0*4),%a0 2351 dputn %a0 2352 2353 /* Insert the address into the page table 2354 */ 2355 movel ARG1,%d0 2356 andw #-PAGESIZE,%d0 2357 orw #_PAGE_PRESENT+_PAGE_ACCESSED+_PAGE_DIRTY,%d0 2358 movel %d0,%a0@ 2359 dputn %d0 2360 2361 dputc '\n' 2362 2363func_return mmu_temp_map 2364 2365func_start mmu_engage,%d0-%d2/%a0-%a3 2366 2367 moveq #ROOT_TABLE_SIZE-1,%d0 2368 /* Temporarily use a different root table. */ 2369 lea %pc@(L(kernel_pgdir_ptr)),%a0 2370 movel %a0@,%a2 2371 movel %pc@(L(memory_start)),%a1 2372 movel %a1,%a0@ 2373 movel %a2,%a0 23741: 2375 movel %a0@+,%a1@+ 2376 dbra %d0,1b 2377 2378 lea %pc@(L(temp_mmap_mem)),%a0 2379 movel %a1,%a0@ 2380 2381 movew #PAGESIZE-1,%d0 23821: 2383 clrl %a1@+ 2384 dbra %d0,1b 2385 2386 lea %pc@(1b),%a0 2387 movel #1b,%a1 2388 /* Skip temp mappings if phys == virt */ 2389 cmpl %a0,%a1 2390 jeq 1f 2391 2392 mmu_temp_map %a0,%a0 2393 mmu_temp_map %a0,%a1 2394 2395 addw #PAGESIZE,%a0 2396 addw #PAGESIZE,%a1 2397 mmu_temp_map %a0,%a0 2398 mmu_temp_map %a0,%a1 23991: 2400 movel %pc@(L(memory_start)),%a3 2401 movel %pc@(L(phys_kernel_start)),%d2 2402 2403 is_not_040_or_060(L(mmu_engage_030)) 2404 2405L(mmu_engage_040): 2406 .chip 68040 2407 nop 2408 cinva %bc 2409 nop 2410 pflusha 2411 nop 2412 movec %a3,%srp 2413 movel #TC_ENABLE+TC_PAGE4K,%d0 2414 movec %d0,%tc /* enable the MMU */ 2415 jmp 1f:l 24161: nop 2417 movec %a2,%srp 2418 nop 2419 cinva %bc 2420 nop 2421 pflusha 2422 .chip 68k 2423 jra L(mmu_engage_cleanup) 2424 2425L(mmu_engage_030_temp): 2426 .space 12 2427L(mmu_engage_030): 2428 .chip 68030 2429 lea %pc@(L(mmu_engage_030_temp)),%a0 2430 movel #0x80000002,%a0@ 2431 movel %a3,%a0@(4) 2432 movel #0x0808,%d0 2433 movec %d0,%cacr 2434 pmove %a0@,%srp 2435 pflusha 2436 /* 2437 * enable,super root enable,4096 byte pages,7 bit root index, 2438 * 7 bit pointer index, 6 bit page table index. 2439 */ 2440 movel #0x82c07760,%a0@(8) 2441 pmove %a0@(8),%tc /* enable the MMU */ 2442 jmp 1f:l 24431: movel %a2,%a0@(4) 2444 movel #0x0808,%d0 2445 movec %d0,%cacr 2446 pmove %a0@,%srp 2447 pflusha 2448 .chip 68k 2449 2450L(mmu_engage_cleanup): 2451 subl #PAGE_OFFSET,%d2 2452 subl %d2,%a2 2453 movel %a2,L(kernel_pgdir_ptr) 2454 subl %d2,%fp 2455 subl %d2,%sp 2456 subl %d2,ARG0 2457 2458func_return mmu_engage 2459 2460func_start mmu_get_root_table_entry,%d0/%a1 2461 2462 2463 movel %pc@(L(kernel_pgdir_ptr)),%a0 2464 tstl %a0 2465 jne 2f 2466 2467 dputs "\nmmu_init:" 2468 2469 /* Find the start of free memory, get_bi_record does this for us, 2470 * as the bootinfo structure is located directly behind the kernel 2471 * and and we simply search for the last entry. 2472 */ 2473 get_bi_record BI_LAST 2474 addw #PAGESIZE-1,%a0 2475 movel %a0,%d0 2476 andw #-PAGESIZE,%d0 2477 2478 dputn %d0 2479 2480 lea %pc@(L(memory_start)),%a0 2481 movel %d0,%a0@ 2482 lea %pc@(L(kernel_end)),%a0 2483 movel %d0,%a0@ 2484 2485 /* we have to return the first page at _stext since the init code 2486 * in mm/init.c simply expects kernel_pg_dir there, the rest of 2487 * page is used for further ptr tables in get_ptr_table. 2488 */ 2489 lea %pc@(_stext),%a0 2490 lea %pc@(L(mmu_cached_pointer_tables)),%a1 2491 movel %a0,%a1@ 2492 addl #ROOT_TABLE_SIZE*4,%a1@ 2493 2494 lea %pc@(L(mmu_num_pointer_tables)),%a1 2495 addql #1,%a1@ 2496 2497 /* clear the page 2498 */ 2499 movel %a0,%a1 2500 movew #PAGESIZE/4-1,%d0 25011: 2502 clrl %a1@+ 2503 dbra %d0,1b 2504 2505 lea %pc@(L(kernel_pgdir_ptr)),%a1 2506 movel %a0,%a1@ 2507 2508 dputn %a0 2509 dputc '\n' 25102: 2511 movel ARG1,%d0 2512 lea %a0@(%d0*4),%a0 2513 2514 2515func_return mmu_get_root_table_entry 2516 2517 2518 2519func_start mmu_get_ptr_table_entry,%d0/%a1 2520 2521 2522 movel ARG1,%a0 2523 movel %a0@,%d0 2524 jne 2f 2525 2526 /* Keep track of the number of pointer tables we use 2527 */ 2528 dputs "\nmmu_get_new_ptr_table:" 2529 lea %pc@(L(mmu_num_pointer_tables)),%a0 2530 movel %a0@,%d0 2531 addql #1,%a0@ 2532 2533 /* See if there is a free pointer table in our cache of pointer tables 2534 */ 2535 lea %pc@(L(mmu_cached_pointer_tables)),%a1 2536 andw #7,%d0 2537 jne 1f 2538 2539 /* Get a new pointer table page from above the kernel memory 2540 */ 2541 get_new_page 2542 movel %a0,%a1@ 25431: 2544 /* There is an unused pointer table in our cache... use it 2545 */ 2546 movel %a1@,%d0 2547 addl #PTR_TABLE_SIZE*4,%a1@ 2548 2549 dputn %d0 2550 dputc '\n' 2551 2552 /* Insert the new pointer table into the root table 2553 */ 2554 movel ARG1,%a0 2555 orw #_PAGE_TABLE+_PAGE_ACCESSED,%d0 2556 movel %d0,%a0@ 25572: 2558 /* Extract the pointer table entry 2559 */ 2560 andw #-PTR_TABLE_SIZE,%d0 2561 movel %d0,%a0 2562 movel ARG2,%d0 2563 lea %a0@(%d0*4),%a0 2564 2565 2566func_return mmu_get_ptr_table_entry 2567 2568 2569func_start mmu_get_page_table_entry,%d0/%a1 2570 2571 2572 movel ARG1,%a0 2573 movel %a0@,%d0 2574 jne 2f 2575 2576 /* If the page table entry doesn't exist, we allocate a complete new 2577 * page and use it as one continues big page table which can cover 2578 * 4MB of memory, nearly almost all mappings have that alignment. 2579 */ 2580 get_new_page 2581 addw #_PAGE_TABLE+_PAGE_ACCESSED,%a0 2582 2583 /* align pointer table entry for a page of page tables 2584 */ 2585 movel ARG1,%d0 2586 andw #-(PAGESIZE/PAGE_TABLE_SIZE),%d0 2587 movel %d0,%a1 2588 2589 /* Insert the page tables into the pointer entries 2590 */ 2591 moveq #PAGESIZE/PAGE_TABLE_SIZE/4-1,%d0 25921: 2593 movel %a0,%a1@+ 2594 lea %a0@(PAGE_TABLE_SIZE*4),%a0 2595 dbra %d0,1b 2596 2597 /* Now we can get the initialized pointer table entry 2598 */ 2599 movel ARG1,%a0 2600 movel %a0@,%d0 26012: 2602 /* Extract the page table entry 2603 */ 2604 andw #-PAGE_TABLE_SIZE,%d0 2605 movel %d0,%a0 2606 movel ARG2,%d0 2607 lea %a0@(%d0*4),%a0 2608 2609 2610func_return mmu_get_page_table_entry 2611 2612/* 2613 * get_new_page 2614 * 2615 * Return a new page from the memory start and clear it. 2616 */ 2617func_start get_new_page,%d0/%a1 2618 2619 dputs "\nget_new_page:" 2620 2621 /* allocate the page and adjust memory_start 2622 */ 2623 lea %pc@(L(memory_start)),%a0 2624 movel %a0@,%a1 2625 addl #PAGESIZE,%a0@ 2626 2627 /* clear the new page 2628 */ 2629 movel %a1,%a0 2630 movew #PAGESIZE/4-1,%d0 26311: 2632 clrl %a1@+ 2633 dbra %d0,1b 2634 2635 dputn %a0 2636 dputc '\n' 2637 2638func_return get_new_page 2639 2640 2641 2642/* 2643 * Debug output support 2644 * Atarians have a choice between the parallel port, the serial port 2645 * from the MFP or a serial port of the SCC 2646 */ 2647 2648#ifdef CONFIG_MAC 2649 2650L(scc_initable_mac): 2651 .byte 9,12 /* Reset */ 2652 .byte 4,0x44 /* x16, 1 stopbit, no parity */ 2653 .byte 3,0xc0 /* receiver: 8 bpc */ 2654 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */ 2655 .byte 9,0 /* no interrupts */ 2656 .byte 10,0 /* NRZ */ 2657 .byte 11,0x50 /* use baud rate generator */ 2658 .byte 12,10,13,0 /* 9600 baud */ 2659 .byte 14,1 /* Baud rate generator enable */ 2660 .byte 3,0xc1 /* enable receiver */ 2661 .byte 5,0xea /* enable transmitter */ 2662 .byte -1 2663 .even 2664#endif 2665 2666#ifdef CONFIG_ATARI 2667/* #define USE_PRINTER */ 2668/* #define USE_SCC_B */ 2669/* #define USE_SCC_A */ 2670#define USE_MFP 2671 2672#if defined(USE_SCC_A) || defined(USE_SCC_B) 2673#define USE_SCC 2674/* Initialisation table for SCC */ 2675L(scc_initable): 2676 .byte 9,12 /* Reset */ 2677 .byte 4,0x44 /* x16, 1 stopbit, no parity */ 2678 .byte 3,0xc0 /* receiver: 8 bpc */ 2679 .byte 5,0xe2 /* transmitter: 8 bpc, assert dtr/rts */ 2680 .byte 9,0 /* no interrupts */ 2681 .byte 10,0 /* NRZ */ 2682 .byte 11,0x50 /* use baud rate generator */ 2683 .byte 12,24,13,0 /* 9600 baud */ 2684 .byte 14,2,14,3 /* use master clock for BRG, enable */ 2685 .byte 3,0xc1 /* enable receiver */ 2686 .byte 5,0xea /* enable transmitter */ 2687 .byte -1 2688 .even 2689#endif 2690 2691#ifdef USE_PRINTER 2692 2693LPSG_SELECT = 0xff8800 2694LPSG_READ = 0xff8800 2695LPSG_WRITE = 0xff8802 2696LPSG_IO_A = 14 2697LPSG_IO_B = 15 2698LPSG_CONTROL = 7 2699LSTMFP_GPIP = 0xfffa01 2700LSTMFP_DDR = 0xfffa05 2701LSTMFP_IERB = 0xfffa09 2702 2703#elif defined(USE_SCC_B) 2704 2705LSCC_CTRL = 0xff8c85 2706LSCC_DATA = 0xff8c87 2707 2708#elif defined(USE_SCC_A) 2709 2710LSCC_CTRL = 0xff8c81 2711LSCC_DATA = 0xff8c83 2712 2713#elif defined(USE_MFP) 2714 2715LMFP_UCR = 0xfffa29 2716LMFP_TDCDR = 0xfffa1d 2717LMFP_TDDR = 0xfffa25 2718LMFP_TSR = 0xfffa2d 2719LMFP_UDR = 0xfffa2f 2720 2721#endif 2722#endif /* CONFIG_ATARI */ 2723 2724/* 2725 * Serial port output support. 2726 */ 2727 2728/* 2729 * Initialize serial port hardware for 9600/8/1 2730 */ 2731func_start serial_init,%d0/%d1/%a0/%a1 2732 /* 2733 * Some of the register usage that follows 2734 * CONFIG_AMIGA 2735 * a0 = pointer to boot info record 2736 * d0 = boot info offset 2737 * CONFIG_ATARI 2738 * a0 = address of SCC 2739 * a1 = Liobase address/address of scc_initable 2740 * d0 = init data for serial port 2741 * CONFIG_MAC 2742 * a0 = address of SCC 2743 * a1 = address of scc_initable_mac 2744 * d0 = init data for serial port 2745 */ 2746 2747#ifdef CONFIG_AMIGA 2748#define SERIAL_DTR 7 2749#define SERIAL_CNTRL CIABBASE+C_PRA 2750 2751 is_not_amiga(1f) 2752 lea %pc@(L(custom)),%a0 2753 movel #-ZTWOBASE,%a0@ 2754 bclr #SERIAL_DTR,SERIAL_CNTRL-ZTWOBASE 2755 get_bi_record BI_AMIGA_SERPER 2756 movew %a0@,CUSTOMBASE+C_SERPER-ZTWOBASE 2757| movew #61,CUSTOMBASE+C_SERPER-ZTWOBASE 27581: 2759#endif 2760#ifdef CONFIG_ATARI 2761 is_not_atari(4f) 2762 movel %pc@(L(iobase)),%a1 2763#if defined(USE_PRINTER) 2764 bclr #0,%a1@(LSTMFP_IERB) 2765 bclr #0,%a1@(LSTMFP_DDR) 2766 moveb #LPSG_CONTROL,%a1@(LPSG_SELECT) 2767 moveb #0xff,%a1@(LPSG_WRITE) 2768 moveb #LPSG_IO_B,%a1@(LPSG_SELECT) 2769 clrb %a1@(LPSG_WRITE) 2770 moveb #LPSG_IO_A,%a1@(LPSG_SELECT) 2771 moveb %a1@(LPSG_READ),%d0 2772 bset #5,%d0 2773 moveb %d0,%a1@(LPSG_WRITE) 2774#elif defined(USE_SCC) 2775 lea %a1@(LSCC_CTRL),%a0 2776 lea %pc@(L(scc_initable)),%a1 27772: moveb %a1@+,%d0 2778 jmi 3f 2779 moveb %d0,%a0@ 2780 moveb %a1@+,%a0@ 2781 jra 2b 27823: clrb %a0@ 2783#elif defined(USE_MFP) 2784 bclr #1,%a1@(LMFP_TSR) 2785 moveb #0x88,%a1@(LMFP_UCR) 2786 andb #0x70,%a1@(LMFP_TDCDR) 2787 moveb #2,%a1@(LMFP_TDDR) 2788 orb #1,%a1@(LMFP_TDCDR) 2789 bset #1,%a1@(LMFP_TSR) 2790#endif 2791 jra L(serial_init_done) 27924: 2793#endif 2794#ifdef CONFIG_MAC 2795 is_not_mac(L(serial_init_not_mac)) 2796#ifdef MAC_SERIAL_DEBUG 2797#if !defined(MAC_USE_SCC_A) && !defined(MAC_USE_SCC_B) 2798#define MAC_USE_SCC_B 2799#endif 2800#define mac_scc_cha_b_ctrl_offset 0x0 2801#define mac_scc_cha_a_ctrl_offset 0x2 2802#define mac_scc_cha_b_data_offset 0x4 2803#define mac_scc_cha_a_data_offset 0x6 2804 2805#ifdef MAC_USE_SCC_A 2806 /* Initialize channel A */ 2807 movel %pc@(L(mac_sccbase)),%a0 2808 lea %pc@(L(scc_initable_mac)),%a1 28095: moveb %a1@+,%d0 2810 jmi 6f 2811 moveb %d0,%a0@(mac_scc_cha_a_ctrl_offset) 2812 moveb %a1@+,%a0@(mac_scc_cha_a_ctrl_offset) 2813 jra 5b 28146: 2815#endif /* MAC_USE_SCC_A */ 2816 2817#ifdef MAC_USE_SCC_B 2818 /* Initialize channel B */ 2819#ifndef MAC_USE_SCC_A /* Load mac_sccbase only if needed */ 2820 movel %pc@(L(mac_sccbase)),%a0 2821#endif /* MAC_USE_SCC_A */ 2822 lea %pc@(L(scc_initable_mac)),%a1 28237: moveb %a1@+,%d0 2824 jmi 8f 2825 moveb %d0,%a0@(mac_scc_cha_b_ctrl_offset) 2826 moveb %a1@+,%a0@(mac_scc_cha_b_ctrl_offset) 2827 jra 7b 28288: 2829#endif /* MAC_USE_SCC_B */ 2830#endif /* MAC_SERIAL_DEBUG */ 2831 2832 jra L(serial_init_done) 2833L(serial_init_not_mac): 2834#endif /* CONFIG_MAC */ 2835 2836#ifdef CONFIG_Q40 2837 is_not_q40(2f) 2838/* debug output goes into SRAM, so we don't do it unless requested 2839 - check for '%LX$' signature in SRAM */ 2840 lea %pc@(q40_mem_cptr),%a1 2841 move.l #0xff020010,%a1@ /* must be inited - also used by debug=mem */ 2842 move.l #0xff020000,%a1 2843 cmp.b #'%',%a1@ 2844 bne 2f /*nodbg*/ 2845 addq.w #4,%a1 2846 cmp.b #'L',%a1@ 2847 bne 2f /*nodbg*/ 2848 addq.w #4,%a1 2849 cmp.b #'X',%a1@ 2850 bne 2f /*nodbg*/ 2851 addq.w #4,%a1 2852 cmp.b #'$',%a1@ 2853 bne 2f /*nodbg*/ 2854 /* signature OK */ 2855 lea %pc@(L(q40_do_debug)),%a1 2856 tas %a1@ 2857/*nodbg: q40_do_debug is 0 by default*/ 28582: 2859#endif 2860 2861#ifdef CONFIG_APOLLO 2862/* We count on the PROM initializing SIO1 */ 2863#endif 2864 2865#ifdef CONFIG_HP300 2866/* We count on the boot loader initialising the UART */ 2867#endif 2868 2869L(serial_init_done): 2870func_return serial_init 2871 2872/* 2873 * Output character on serial port. 2874 */ 2875func_start serial_putc,%d0/%d1/%a0/%a1 2876 2877 movel ARG1,%d0 2878 cmpib #'\n',%d0 2879 jbne 1f 2880 2881 /* A little safe recursion is good for the soul */ 2882 serial_putc #'\r' 28831: 2884 2885#ifdef CONFIG_AMIGA 2886 is_not_amiga(2f) 2887 andw #0x00ff,%d0 2888 oriw #0x0100,%d0 2889 movel %pc@(L(custom)),%a0 2890 movew %d0,%a0@(CUSTOMBASE+C_SERDAT) 28911: movew %a0@(CUSTOMBASE+C_SERDATR),%d0 2892 andw #0x2000,%d0 2893 jeq 1b 2894 jra L(serial_putc_done) 28952: 2896#endif 2897 2898#ifdef CONFIG_MAC 2899 is_not_mac(5f) 2900 2901#ifdef MAC_SERIAL_DEBUG 2902 2903#ifdef MAC_USE_SCC_A 2904 movel %pc@(L(mac_sccbase)),%a1 29053: btst #2,%a1@(mac_scc_cha_a_ctrl_offset) 2906 jeq 3b 2907 moveb %d0,%a1@(mac_scc_cha_a_data_offset) 2908#endif /* MAC_USE_SCC_A */ 2909 2910#ifdef MAC_USE_SCC_B 2911#ifndef MAC_USE_SCC_A /* Load mac_sccbase only if needed */ 2912 movel %pc@(L(mac_sccbase)),%a1 2913#endif /* MAC_USE_SCC_A */ 29144: btst #2,%a1@(mac_scc_cha_b_ctrl_offset) 2915 jeq 4b 2916 moveb %d0,%a1@(mac_scc_cha_b_data_offset) 2917#endif /* MAC_USE_SCC_B */ 2918 2919#endif /* MAC_SERIAL_DEBUG */ 2920 2921 jra L(serial_putc_done) 29225: 2923#endif /* CONFIG_MAC */ 2924 2925#ifdef CONFIG_ATARI 2926 is_not_atari(4f) 2927 movel %pc@(L(iobase)),%a1 2928#if defined(USE_PRINTER) 29293: btst #0,%a1@(LSTMFP_GPIP) 2930 jne 3b 2931 moveb #LPSG_IO_B,%a1@(LPSG_SELECT) 2932 moveb %d0,%a1@(LPSG_WRITE) 2933 moveb #LPSG_IO_A,%a1@(LPSG_SELECT) 2934 moveb %a1@(LPSG_READ),%d0 2935 bclr #5,%d0 2936 moveb %d0,%a1@(LPSG_WRITE) 2937 nop 2938 nop 2939 bset #5,%d0 2940 moveb %d0,%a1@(LPSG_WRITE) 2941#elif defined(USE_SCC) 29423: btst #2,%a1@(LSCC_CTRL) 2943 jeq 3b 2944 moveb %d0,%a1@(LSCC_DATA) 2945#elif defined(USE_MFP) 29463: btst #7,%a1@(LMFP_TSR) 2947 jeq 3b 2948 moveb %d0,%a1@(LMFP_UDR) 2949#endif 2950 jra L(serial_putc_done) 29514: 2952#endif /* CONFIG_ATARI */ 2953 2954#ifdef CONFIG_MVME147 2955 is_not_mvme147(2f) 29561: btst #2,M147_SCC_CTRL_A 2957 jeq 1b 2958 moveb %d0,M147_SCC_DATA_A 2959 jbra L(serial_putc_done) 29602: 2961#endif 2962 2963#ifdef CONFIG_MVME16x 2964 is_not_mvme16x(2f) 2965 /* 2966 * If the loader gave us a board type then we can use that to 2967 * select an appropriate output routine; otherwise we just use 2968 * the Bug code. If we haev to use the Bug that means the Bug 2969 * workspace has to be valid, which means the Bug has to use 2970 * the SRAM, which is non-standard. 2971 */ 2972 moveml %d0-%d7/%a2-%a6,%sp@- 2973 movel vme_brdtype,%d1 2974 jeq 1f | No tag - use the Bug 2975 cmpi #VME_TYPE_MVME162,%d1 2976 jeq 6f 2977 cmpi #VME_TYPE_MVME172,%d1 2978 jne 5f 2979 /* 162/172; it's an SCC */ 29806: btst #2,M162_SCC_CTRL_A 2981 nop 2982 nop 2983 nop 2984 jeq 6b 2985 moveb #8,M162_SCC_CTRL_A 2986 nop 2987 nop 2988 nop 2989 moveb %d0,M162_SCC_CTRL_A 2990 jra 3f 29915: 2992 /* 166/167/177; it's a CD2401 */ 2993 moveb #0,M167_CYCAR 2994 moveb M167_CYIER,%d2 2995 moveb #0x02,M167_CYIER 29967: 2997 btst #5,M167_PCSCCTICR 2998 jeq 7b 2999 moveb M167_PCTPIACKR,%d1 3000 moveb M167_CYLICR,%d1 3001 jeq 8f 3002 moveb #0x08,M167_CYTEOIR 3003 jra 7b 30048: 3005 moveb %d0,M167_CYTDR 3006 moveb #0,M167_CYTEOIR 3007 moveb %d2,M167_CYIER 3008 jra 3f 30091: 3010 moveb %d0,%sp@- 3011 trap #15 3012 .word 0x0020 /* TRAP 0x020 */ 30133: 3014 moveml %sp@+,%d0-%d7/%a2-%a6 3015 jbra L(serial_putc_done) 30162: 3017#endif /* CONFIG_MVME16x */ 3018 3019#ifdef CONFIG_BVME6000 3020 is_not_bvme6000(2f) 3021 /* 3022 * The BVME6000 machine has a serial port ... 3023 */ 30241: btst #2,BVME_SCC_CTRL_A 3025 jeq 1b 3026 moveb %d0,BVME_SCC_DATA_A 3027 jbra L(serial_putc_done) 30282: 3029#endif 3030 3031#ifdef CONFIG_SUN3X 3032 is_not_sun3x(2f) 3033 movel %d0,-(%sp) 3034 movel 0xFEFE0018,%a1 3035 jbsr (%a1) 3036 addq #4,%sp 3037 jbra L(serial_putc_done) 30382: 3039#endif 3040 3041#ifdef CONFIG_Q40 3042 is_not_q40(2f) 3043 tst.l %pc@(L(q40_do_debug)) /* only debug if requested */ 3044 beq 2f 3045 lea %pc@(q40_mem_cptr),%a1 3046 move.l %a1@,%a0 3047 move.b %d0,%a0@ 3048 addq.l #4,%a0 3049 move.l %a0,%a1@ 3050 jbra L(serial_putc_done) 30512: 3052#endif 3053 3054#ifdef CONFIG_APOLLO 3055 is_not_apollo(2f) 3056 movl %pc@(L(iobase)),%a1 3057 moveb %d0,%a1@(LTHRB0) 30581: moveb %a1@(LSRB0),%d0 3059 andb #0x4,%d0 3060 beq 1b 3061 jbra L(serial_putc_done) 30622: 3063#endif 3064 3065#ifdef CONFIG_HP300 3066 is_not_hp300(3f) 3067 movl %pc@(L(iobase)),%a1 3068 addl %pc@(L(uartbase)),%a1 3069 movel %pc@(L(uart_scode)),%d1 /* Check the scode */ 3070 jmi 3f /* Unset? Exit */ 3071 cmpi #256,%d1 /* APCI scode? */ 3072 jeq 2f 30731: moveb %a1@(DCALSR),%d1 /* Output to DCA */ 3074 andb #0x20,%d1 3075 beq 1b 3076 moveb %d0,%a1@(DCADATA) 3077 jbra L(serial_putc_done) 30782: moveb %a1@(APCILSR),%d1 /* Output to APCI */ 3079 andb #0x20,%d1 3080 beq 2b 3081 moveb %d0,%a1@(APCIDATA) 3082 jbra L(serial_putc_done) 30833: 3084#endif 3085 3086L(serial_putc_done): 3087func_return serial_putc 3088 3089/* 3090 * Output a string. 3091 */ 3092func_start puts,%d0/%a0 3093 3094 movel ARG1,%a0 3095 jra 2f 30961: 3097#ifdef CONSOLE 3098 console_putc %d0 3099#endif 3100#ifdef SERIAL_DEBUG 3101 serial_putc %d0 3102#endif 31032: moveb %a0@+,%d0 3104 jne 1b 3105 3106func_return puts 3107 3108/* 3109 * Output number in hex notation. 3110 */ 3111 3112func_start putn,%d0-%d2 3113 3114 putc ' ' 3115 3116 movel ARG1,%d0 3117 moveq #7,%d1 31181: roll #4,%d0 3119 move %d0,%d2 3120 andb #0x0f,%d2 3121 addb #'0',%d2 3122 cmpb #'9',%d2 3123 jls 2f 3124 addb #'A'-('9'+1),%d2 31252: 3126#ifdef CONSOLE 3127 console_putc %d2 3128#endif 3129#ifdef SERIAL_DEBUG 3130 serial_putc %d2 3131#endif 3132 dbra %d1,1b 3133 3134func_return putn 3135 3136#ifdef CONFIG_MAC 3137/* 3138 * mac_serial_print 3139 * 3140 * This routine takes its parameters on the stack. It then 3141 * turns around and calls the internal routine. This routine 3142 * is used until the Linux console driver initializes itself. 3143 * 3144 * The calling parameters are: 3145 * void mac_serial_print(const char *str); 3146 * 3147 * This routine does NOT understand variable arguments only 3148 * simple strings! 3149 */ 3150ENTRY(mac_serial_print) 3151 moveml %d0/%a0,%sp@- 3152 move %sr,%sp@- 3153 ori #0x0700,%sr 3154 movel %sp@(10),%a0 /* fetch parameter */ 3155 jra 2f 31561: serial_putc %d0 31572: moveb %a0@+,%d0 3158 jne 1b 3159 move %sp@+,%sr 3160 moveml %sp@+,%d0/%a0 3161 rts 3162#endif /* CONFIG_MAC */ 3163 3164#if defined(CONFIG_HP300) || defined(CONFIG_APOLLO) 3165func_start set_leds,%d0/%a0 3166 movel ARG1,%d0 3167#ifdef CONFIG_HP300 3168 is_not_hp300(1f) 3169 movel %pc@(L(iobase)),%a0 3170 moveb %d0,%a0@(0x1ffff) 3171 jra 2f 3172#endif 31731: 3174#ifdef CONFIG_APOLLO 3175 movel %pc@(L(iobase)),%a0 3176 lsll #8,%d0 3177 eorw #0xff00,%d0 3178 moveb %d0,%a0@(LCPUCTRL) 3179#endif 31802: 3181func_return set_leds 3182#endif 3183 3184#ifdef CONSOLE 3185/* 3186 * For continuity, see the data alignment 3187 * to which this structure is tied. 3188 */ 3189#define Lconsole_struct_cur_column 0 3190#define Lconsole_struct_cur_row 4 3191#define Lconsole_struct_num_columns 8 3192#define Lconsole_struct_num_rows 12 3193#define Lconsole_struct_left_edge 16 3194#define Lconsole_struct_penguin_putc 20 3195 3196func_start console_init,%a0-%a4/%d0-%d7 3197 /* 3198 * Some of the register usage that follows 3199 * a0 = pointer to boot_info 3200 * a1 = pointer to screen 3201 * a2 = pointer to Lconsole_globals 3202 * d3 = pixel width of screen 3203 * d4 = pixel height of screen 3204 * (d3,d4) ~= (x,y) of a point just below 3205 * and to the right of the screen 3206 * NOT on the screen! 3207 * d5 = number of bytes per scan line 3208 * d6 = number of bytes on the entire screen 3209 */ 3210 3211 lea %pc@(L(console_globals)),%a2 3212 movel %pc@(L(mac_videobase)),%a1 3213 movel %pc@(L(mac_rowbytes)),%d5 3214 movel %pc@(L(mac_dimensions)),%d3 /* -> low byte */ 3215 movel %d3,%d4 3216 swap %d4 /* -> high byte */ 3217 andl #0xffff,%d3 /* d3 = screen width in pixels */ 3218 andl #0xffff,%d4 /* d4 = screen height in pixels */ 3219 3220 movel %d5,%d6 3221| subl #20,%d6 3222 mulul %d4,%d6 /* scan line bytes x num scan lines */ 3223 divul #8,%d6 /* we'll clear 8 bytes at a time */ 3224 moveq #-1,%d0 /* Mac_black */ 3225 subq #1,%d6 3226 3227L(console_clear_loop): 3228 movel %d0,%a1@+ 3229 movel %d0,%a1@+ 3230 dbra %d6,L(console_clear_loop) 3231 3232 /* Calculate font size */ 3233 3234#if defined(FONT_8x8) && defined(CONFIG_FONT_8x8) 3235 lea %pc@(font_vga_8x8),%a0 3236#elif defined(FONT_8x16) && defined(CONFIG_FONT_8x16) 3237 lea %pc@(font_vga_8x16),%a0 3238#elif defined(FONT_6x11) && defined(CONFIG_FONT_6x11) 3239 lea %pc@(font_vga_6x11),%a0 3240#elif defined(CONFIG_FONT_8x8) /* default */ 3241 lea %pc@(font_vga_8x8),%a0 3242#else /* no compiled-in font */ 3243 lea 0,%a0 3244#endif 3245 3246 /* 3247 * At this point we make a shift in register usage 3248 * a1 = address of console_font pointer 3249 */ 3250 lea %pc@(L(console_font)),%a1 3251 movel %a0,%a1@ /* store pointer to struct fbcon_font_desc in console_font */ 3252 tstl %a0 3253 jeq 1f 3254 lea %pc@(L(console_font_data)),%a4 3255 movel %a0@(FONT_DESC_DATA),%d0 3256 subl #L(console_font),%a1 3257 addl %a1,%d0 3258 movel %d0,%a4@ 3259 3260 /* 3261 * Calculate global maxs 3262 * Note - we can use either an 3263 * 8 x 16 or 8 x 8 character font 3264 * 6 x 11 also supported 3265 */ 3266 /* ASSERT: a0 = contents of Lconsole_font */ 3267 movel %d3,%d0 /* screen width in pixels */ 3268 divul %a0@(FONT_DESC_WIDTH),%d0 /* d0 = max num chars per row */ 3269 3270 movel %d4,%d1 /* screen height in pixels */ 3271 divul %a0@(FONT_DESC_HEIGHT),%d1 /* d1 = max num rows */ 3272 3273 movel %d0,%a2@(Lconsole_struct_num_columns) 3274 movel %d1,%a2@(Lconsole_struct_num_rows) 3275 3276 /* 3277 * Clear the current row and column 3278 */ 3279 clrl %a2@(Lconsole_struct_cur_column) 3280 clrl %a2@(Lconsole_struct_cur_row) 3281 clrl %a2@(Lconsole_struct_left_edge) 3282 3283 /* 3284 * Initialization is complete 3285 */ 32861: 3287func_return console_init 3288 3289func_start console_put_stats,%a0/%d7 3290 /* 3291 * Some of the register usage that follows 3292 * a0 = pointer to boot_info 3293 * d7 = value of boot_info fields 3294 */ 3295 puts "\nMacLinux\n\n" 3296 3297#ifdef SERIAL_DEBUG 3298 puts " vidaddr:" 3299 putn %pc@(L(mac_videobase)) /* video addr. */ 3300 3301 puts "\n _stext:" 3302 lea %pc@(_stext),%a0 3303 putn %a0 3304 3305 puts "\nbootinfo:" 3306 lea %pc@(_end),%a0 3307 putn %a0 3308 3309 puts "\ncpuid:" 3310 putn %pc@(L(cputype)) 3311 putc '\n' 3312 3313#ifdef MAC_SERIAL_DEBUG 3314 putn %pc@(L(mac_sccbase)) 3315 putc '\n' 3316#endif 3317# if defined(MMU_PRINT) 3318 jbsr mmu_print_machine_cpu_types 3319# endif /* MMU_PRINT */ 3320#endif /* SERIAL_DEBUG */ 3321 3322func_return console_put_stats 3323 3324#ifdef CONSOLE_PENGUIN 3325func_start console_put_penguin,%a0-%a1/%d0-%d7 3326 /* 3327 * Get 'that_penguin' onto the screen in the upper right corner 3328 * penguin is 64 x 74 pixels, align against right edge of screen 3329 */ 3330 lea %pc@(L(mac_dimensions)),%a0 3331 movel %a0@,%d0 3332 andil #0xffff,%d0 3333 subil #64,%d0 /* snug up against the right edge */ 3334 clrl %d1 /* start at the top */ 3335 movel #73,%d7 3336 lea %pc@(L(that_penguin)),%a1 3337L(console_penguin_row): 3338 movel #31,%d6 3339L(console_penguin_pixel_pair): 3340 moveb %a1@,%d2 3341 lsrb #4,%d2 3342 console_plot_pixel %d0,%d1,%d2 3343 addq #1,%d0 3344 moveb %a1@+,%d2 3345 console_plot_pixel %d0,%d1,%d2 3346 addq #1,%d0 3347 dbra %d6,L(console_penguin_pixel_pair) 3348 3349 subil #64,%d0 3350 addq #1,%d1 3351 dbra %d7,L(console_penguin_row) 3352 3353func_return console_put_penguin 3354 3355/* include penguin bitmap */ 3356L(that_penguin): 3357#include "../mac/mac_penguin.S" 3358#endif 3359 3360 /* 3361 * Calculate source and destination addresses 3362 * output a1 = dest 3363 * a2 = source 3364 */ 3365 3366func_start console_scroll,%a0-%a4/%d0-%d7 3367 lea %pc@(L(mac_videobase)),%a0 3368 movel %a0@,%a1 3369 movel %a1,%a2 3370 lea %pc@(L(mac_rowbytes)),%a0 3371 movel %a0@,%d5 3372 movel %pc@(L(console_font)),%a0 3373 tstl %a0 3374 jeq 1f 3375 mulul %a0@(FONT_DESC_HEIGHT),%d5 /* account for # scan lines per character */ 3376 addal %d5,%a2 3377 3378 /* 3379 * Get dimensions 3380 */ 3381 lea %pc@(L(mac_dimensions)),%a0 3382 movel %a0@,%d3 3383 movel %d3,%d4 3384 swap %d4 3385 andl #0xffff,%d3 /* d3 = screen width in pixels */ 3386 andl #0xffff,%d4 /* d4 = screen height in pixels */ 3387 3388 /* 3389 * Calculate number of bytes to move 3390 */ 3391 lea %pc@(L(mac_rowbytes)),%a0 3392 movel %a0@,%d6 3393 movel %pc@(L(console_font)),%a0 3394 subl %a0@(FONT_DESC_HEIGHT),%d4 /* we're not scrolling the top row! */ 3395 mulul %d4,%d6 /* scan line bytes x num scan lines */ 3396 divul #32,%d6 /* we'll move 8 longs at a time */ 3397 subq #1,%d6 3398 3399L(console_scroll_loop): 3400 movel %a2@+,%a1@+ 3401 movel %a2@+,%a1@+ 3402 movel %a2@+,%a1@+ 3403 movel %a2@+,%a1@+ 3404 movel %a2@+,%a1@+ 3405 movel %a2@+,%a1@+ 3406 movel %a2@+,%a1@+ 3407 movel %a2@+,%a1@+ 3408 dbra %d6,L(console_scroll_loop) 3409 3410 lea %pc@(L(mac_rowbytes)),%a0 3411 movel %a0@,%d6 3412 movel %pc@(L(console_font)),%a0 3413 mulul %a0@(FONT_DESC_HEIGHT),%d6 /* scan line bytes x font height */ 3414 divul #32,%d6 /* we'll move 8 words at a time */ 3415 subq #1,%d6 3416 3417 moveq #-1,%d0 3418L(console_scroll_clear_loop): 3419 movel %d0,%a1@+ 3420 movel %d0,%a1@+ 3421 movel %d0,%a1@+ 3422 movel %d0,%a1@+ 3423 movel %d0,%a1@+ 3424 movel %d0,%a1@+ 3425 movel %d0,%a1@+ 3426 movel %d0,%a1@+ 3427 dbra %d6,L(console_scroll_clear_loop) 3428 34291: 3430func_return console_scroll 3431 3432 3433func_start console_putc,%a0/%a1/%d0-%d7 3434 3435 is_not_mac(L(console_exit)) 3436 tstl %pc@(L(console_font)) 3437 jeq L(console_exit) 3438 3439 /* Output character in d7 on console. 3440 */ 3441 movel ARG1,%d7 3442 cmpib #'\n',%d7 3443 jbne 1f 3444 3445 /* A little safe recursion is good for the soul */ 3446 console_putc #'\r' 34471: 3448 lea %pc@(L(console_globals)),%a0 3449 3450 cmpib #10,%d7 3451 jne L(console_not_lf) 3452 movel %a0@(Lconsole_struct_cur_row),%d0 3453 addil #1,%d0 3454 movel %d0,%a0@(Lconsole_struct_cur_row) 3455 movel %a0@(Lconsole_struct_num_rows),%d1 3456 cmpl %d1,%d0 3457 jcs 1f 3458 subil #1,%d0 3459 movel %d0,%a0@(Lconsole_struct_cur_row) 3460 console_scroll 34611: 3462 jra L(console_exit) 3463 3464L(console_not_lf): 3465 cmpib #13,%d7 3466 jne L(console_not_cr) 3467 clrl %a0@(Lconsole_struct_cur_column) 3468 jra L(console_exit) 3469 3470L(console_not_cr): 3471 cmpib #1,%d7 3472 jne L(console_not_home) 3473 clrl %a0@(Lconsole_struct_cur_row) 3474 clrl %a0@(Lconsole_struct_cur_column) 3475 jra L(console_exit) 3476 3477/* 3478 * At this point we know that the %d7 character is going to be 3479 * rendered on the screen. Register usage is - 3480 * a0 = pointer to console globals 3481 * a1 = font data 3482 * d0 = cursor column 3483 * d1 = cursor row to draw the character 3484 * d7 = character number 3485 */ 3486L(console_not_home): 3487 movel %a0@(Lconsole_struct_cur_column),%d0 3488 addql #1,%a0@(Lconsole_struct_cur_column) 3489 movel %a0@(Lconsole_struct_num_columns),%d1 3490 cmpl %d1,%d0 3491 jcs 1f 3492 console_putc #'\n' /* recursion is OK! */ 34931: 3494 movel %a0@(Lconsole_struct_cur_row),%d1 3495 3496 /* 3497 * At this point we make a shift in register usage 3498 * a0 = address of pointer to font data (fbcon_font_desc) 3499 */ 3500 movel %pc@(L(console_font)),%a0 3501 movel %pc@(L(console_font_data)),%a1 /* Load fbcon_font_desc.data into a1 */ 3502 andl #0x000000ff,%d7 3503 /* ASSERT: a0 = contents of Lconsole_font */ 3504 mulul %a0@(FONT_DESC_HEIGHT),%d7 /* d7 = index into font data */ 3505 addl %d7,%a1 /* a1 = points to char image */ 3506 3507 /* 3508 * At this point we make a shift in register usage 3509 * d0 = pixel coordinate, x 3510 * d1 = pixel coordinate, y 3511 * d2 = (bit 0) 1/0 for white/black (!) pixel on screen 3512 * d3 = font scan line data (8 pixels) 3513 * d6 = count down for the font's pixel width (8) 3514 * d7 = count down for the font's pixel count in height 3515 */ 3516 /* ASSERT: a0 = contents of Lconsole_font */ 3517 mulul %a0@(FONT_DESC_WIDTH),%d0 3518 mulul %a0@(FONT_DESC_HEIGHT),%d1 3519 movel %a0@(FONT_DESC_HEIGHT),%d7 /* Load fbcon_font_desc.height into d7 */ 3520 subq #1,%d7 3521L(console_read_char_scanline): 3522 moveb %a1@+,%d3 3523 3524 /* ASSERT: a0 = contents of Lconsole_font */ 3525 movel %a0@(FONT_DESC_WIDTH),%d6 /* Load fbcon_font_desc.width into d6 */ 3526 subql #1,%d6 3527 3528L(console_do_font_scanline): 3529 lslb #1,%d3 3530 scsb %d2 /* convert 1 bit into a byte */ 3531 console_plot_pixel %d0,%d1,%d2 3532 addq #1,%d0 3533 dbra %d6,L(console_do_font_scanline) 3534 3535 /* ASSERT: a0 = contents of Lconsole_font */ 3536 subl %a0@(FONT_DESC_WIDTH),%d0 3537 addq #1,%d1 3538 dbra %d7,L(console_read_char_scanline) 3539 3540L(console_exit): 3541func_return console_putc 3542 3543 /* 3544 * Input: 3545 * d0 = x coordinate 3546 * d1 = y coordinate 3547 * d2 = (bit 0) 1/0 for white/black (!) 3548 * All registers are preserved 3549 */ 3550func_start console_plot_pixel,%a0-%a1/%d0-%d4 3551 3552 movel %pc@(L(mac_videobase)),%a1 3553 movel %pc@(L(mac_videodepth)),%d3 3554 movel ARG1,%d0 3555 movel ARG2,%d1 3556 mulul %pc@(L(mac_rowbytes)),%d1 3557 movel ARG3,%d2 3558 3559 /* 3560 * Register usage: 3561 * d0 = x coord becomes byte offset into frame buffer 3562 * d1 = y coord 3563 * d2 = black or white (0/1) 3564 * d3 = video depth 3565 * d4 = temp of x (d0) for many bit depths 3566 */ 3567L(test_1bit): 3568 cmpb #1,%d3 3569 jbne L(test_2bit) 3570 movel %d0,%d4 /* we need the low order 3 bits! */ 3571 divul #8,%d0 3572 addal %d0,%a1 3573 addal %d1,%a1 3574 andb #7,%d4 3575 eorb #7,%d4 /* reverse the x-coordinate w/ screen-bit # */ 3576 andb #1,%d2 3577 jbne L(white_1) 3578 bsetb %d4,%a1@ 3579 jbra L(console_plot_pixel_exit) 3580L(white_1): 3581 bclrb %d4,%a1@ 3582 jbra L(console_plot_pixel_exit) 3583 3584L(test_2bit): 3585 cmpb #2,%d3 3586 jbne L(test_4bit) 3587 movel %d0,%d4 /* we need the low order 2 bits! */ 3588 divul #4,%d0 3589 addal %d0,%a1 3590 addal %d1,%a1 3591 andb #3,%d4 3592 eorb #3,%d4 /* reverse the x-coordinate w/ screen-bit # */ 3593 lsll #1,%d4 /* ! */ 3594 andb #1,%d2 3595 jbne L(white_2) 3596 bsetb %d4,%a1@ 3597 addq #1,%d4 3598 bsetb %d4,%a1@ 3599 jbra L(console_plot_pixel_exit) 3600L(white_2): 3601 bclrb %d4,%a1@ 3602 addq #1,%d4 3603 bclrb %d4,%a1@ 3604 jbra L(console_plot_pixel_exit) 3605 3606L(test_4bit): 3607 cmpb #4,%d3 3608 jbne L(test_8bit) 3609 movel %d0,%d4 /* we need the low order bit! */ 3610 divul #2,%d0 3611 addal %d0,%a1 3612 addal %d1,%a1 3613 andb #1,%d4 3614 eorb #1,%d4 3615 lsll #2,%d4 /* ! */ 3616 andb #1,%d2 3617 jbne L(white_4) 3618 bsetb %d4,%a1@ 3619 addq #1,%d4 3620 bsetb %d4,%a1@ 3621 addq #1,%d4 3622 bsetb %d4,%a1@ 3623 addq #1,%d4 3624 bsetb %d4,%a1@ 3625 jbra L(console_plot_pixel_exit) 3626L(white_4): 3627 bclrb %d4,%a1@ 3628 addq #1,%d4 3629 bclrb %d4,%a1@ 3630 addq #1,%d4 3631 bclrb %d4,%a1@ 3632 addq #1,%d4 3633 bclrb %d4,%a1@ 3634 jbra L(console_plot_pixel_exit) 3635 3636L(test_8bit): 3637 cmpb #8,%d3 3638 jbne L(test_16bit) 3639 addal %d0,%a1 3640 addal %d1,%a1 3641 andb #1,%d2 3642 jbne L(white_8) 3643 moveb #0xff,%a1@ 3644 jbra L(console_plot_pixel_exit) 3645L(white_8): 3646 clrb %a1@ 3647 jbra L(console_plot_pixel_exit) 3648 3649L(test_16bit): 3650 cmpb #16,%d3 3651 jbne L(console_plot_pixel_exit) 3652 addal %d0,%a1 3653 addal %d0,%a1 3654 addal %d1,%a1 3655 andb #1,%d2 3656 jbne L(white_16) 3657 clrw %a1@ 3658 jbra L(console_plot_pixel_exit) 3659L(white_16): 3660 movew #0x0fff,%a1@ 3661 jbra L(console_plot_pixel_exit) 3662 3663L(console_plot_pixel_exit): 3664func_return console_plot_pixel 3665#endif /* CONSOLE */ 3666 3667 3668__INITDATA 3669 .align 4 3670 3671#if defined(CONFIG_ATARI) || defined(CONFIG_AMIGA) || defined(CONFIG_HP300) || \ 3672 defined(CONFIG_APOLLO) 3673L(custom): 3674L(iobase): 3675 .long 0 3676#endif 3677 3678#if defined(CONSOLE) 3679L(console_globals): 3680 .long 0 /* cursor column */ 3681 .long 0 /* cursor row */ 3682 .long 0 /* max num columns */ 3683 .long 0 /* max num rows */ 3684 .long 0 /* left edge */ 3685 .long 0 /* mac putc */ 3686L(console_font): 3687 .long 0 /* pointer to console font (struct font_desc) */ 3688L(console_font_data): 3689 .long 0 /* pointer to console font data */ 3690#endif /* CONSOLE */ 3691 3692#if defined(MMU_PRINT) 3693L(mmu_print_data): 3694 .long 0 /* valid flag */ 3695 .long 0 /* start logical */ 3696 .long 0 /* next logical */ 3697 .long 0 /* start physical */ 3698 .long 0 /* next physical */ 3699#endif /* MMU_PRINT */ 3700 3701L(cputype): 3702 .long 0 3703L(mmu_cached_pointer_tables): 3704 .long 0 3705L(mmu_num_pointer_tables): 3706 .long 0 3707L(phys_kernel_start): 3708 .long 0 3709L(kernel_end): 3710 .long 0 3711L(memory_start): 3712 .long 0 3713L(kernel_pgdir_ptr): 3714 .long 0 3715L(temp_mmap_mem): 3716 .long 0 3717 3718#if defined(CONFIG_MVME147) 3719M147_SCC_CTRL_A = 0xfffe3002 3720M147_SCC_DATA_A = 0xfffe3003 3721#endif 3722 3723#if defined(CONFIG_MVME16x) 3724M162_SCC_CTRL_A = 0xfff45005 3725M167_CYCAR = 0xfff450ee 3726M167_CYIER = 0xfff45011 3727M167_CYLICR = 0xfff45026 3728M167_CYTEOIR = 0xfff45085 3729M167_CYTDR = 0xfff450f8 3730M167_PCSCCTICR = 0xfff4201e 3731M167_PCTPIACKR = 0xfff42025 3732#endif 3733 3734#if defined(CONFIG_BVME6000) 3735BVME_SCC_CTRL_A = 0xffb0000b 3736BVME_SCC_DATA_A = 0xffb0000f 3737#endif 3738 3739#if defined(CONFIG_MAC) 3740L(mac_booter_data): 3741 .long 0 3742L(mac_videobase): 3743 .long 0 3744L(mac_videodepth): 3745 .long 0 3746L(mac_dimensions): 3747 .long 0 3748L(mac_rowbytes): 3749 .long 0 3750#ifdef MAC_SERIAL_DEBUG 3751L(mac_sccbase): 3752 .long 0 3753#endif /* MAC_SERIAL_DEBUG */ 3754#endif 3755 3756#if defined(CONFIG_APOLLO) 3757LSRB0 = 0x10412 3758LTHRB0 = 0x10416 3759LCPUCTRL = 0x10100 3760#endif 3761 3762#if defined(CONFIG_HP300) 3763DCADATA = 0x11 3764DCALSR = 0x1b 3765APCIDATA = 0x00 3766APCILSR = 0x14 3767L(uartbase): 3768 .long 0 3769L(uart_scode): 3770 .long -1 3771#endif 3772 3773__FINIT 3774 .data 3775 .align 4 3776 3777availmem: 3778 .long 0 3779m68k_pgtable_cachemode: 3780 .long 0 3781m68k_supervisor_cachemode: 3782 .long 0 3783#if defined(CONFIG_MVME16x) 3784mvme_bdid: 3785 .long 0,0,0,0,0,0,0,0 3786#endif 3787#if defined(CONFIG_Q40) 3788q40_mem_cptr: 3789 .long 0 3790L(q40_do_debug): 3791 .long 0 3792#endif 3793