1/* 2 * Procedures for interfacing to Open Firmware. 3 * 4 * Paul Mackerras August 1996. 5 * Copyright (C) 1996-2005 Paul Mackerras. 6 * 7 * Adapted for 64bit PowerPC by Dave Engebretsen and Peter Bergner. 8 * {engebret|bergner}@us.ibm.com 9 * 10 * This program is free software; you can redistribute it and/or 11 * modify it under the terms of the GNU General Public License 12 * as published by the Free Software Foundation; either version 13 * 2 of the License, or (at your option) any later version. 14 */ 15 16#undef DEBUG_PROM 17 18#include <stdarg.h> 19#include <linux/kernel.h> 20#include <linux/string.h> 21#include <linux/init.h> 22#include <linux/threads.h> 23#include <linux/spinlock.h> 24#include <linux/types.h> 25#include <linux/pci.h> 26#include <linux/proc_fs.h> 27#include <linux/stringify.h> 28#include <linux/delay.h> 29#include <linux/initrd.h> 30#include <linux/bitops.h> 31#include <asm/prom.h> 32#include <asm/rtas.h> 33#include <asm/page.h> 34#include <asm/processor.h> 35#include <asm/irq.h> 36#include <asm/io.h> 37#include <asm/smp.h> 38#include <asm/system.h> 39#include <asm/mmu.h> 40#include <asm/pgtable.h> 41#include <asm/pci.h> 42#include <asm/iommu.h> 43#include <asm/btext.h> 44#include <asm/sections.h> 45#include <asm/machdep.h> 46 47#include <linux/linux_logo.h> 48 49/* 50 * Properties whose value is longer than this get excluded from our 51 * copy of the device tree. This value does need to be big enough to 52 * ensure that we don't lose things like the interrupt-map property 53 * on a PCI-PCI bridge. 54 */ 55#define MAX_PROPERTY_LENGTH (1UL * 1024 * 1024) 56 57/* 58 * Eventually bump that one up 59 */ 60#define DEVTREE_CHUNK_SIZE 0x100000 61 62/* 63 * This is the size of the local memory reserve map that gets copied 64 * into the boot params passed to the kernel. That size is totally 65 * flexible as the kernel just reads the list until it encounters an 66 * entry with size 0, so it can be changed without breaking binary 67 * compatibility 68 */ 69#define MEM_RESERVE_MAP_SIZE 8 70 71/* 72 * prom_init() is called very early on, before the kernel text 73 * and data have been mapped to KERNELBASE. At this point the code 74 * is running at whatever address it has been loaded at. 75 * On ppc32 we compile with -mrelocatable, which means that references 76 * to extern and static variables get relocated automatically. 77 * On ppc64 we have to relocate the references explicitly with 78 * RELOC. (Note that strings count as static variables.) 79 * 80 * Because OF may have mapped I/O devices into the area starting at 81 * KERNELBASE, particularly on CHRP machines, we can't safely call 82 * OF once the kernel has been mapped to KERNELBASE. Therefore all 83 * OF calls must be done within prom_init(). 84 * 85 * ADDR is used in calls to call_prom. The 4th and following 86 * arguments to call_prom should be 32-bit values. 87 * On ppc64, 64 bit values are truncated to 32 bits (and 88 * fortunately don't get interpreted as two arguments). 89 */ 90#ifdef CONFIG_PPC64 91#define RELOC(x) (*PTRRELOC(&(x))) 92#define ADDR(x) (u32) add_reloc_offset((unsigned long)(x)) 93#define OF_WORKAROUNDS 0 94#else 95#define RELOC(x) (x) 96#define ADDR(x) (u32) (x) 97#define OF_WORKAROUNDS of_workarounds 98int of_workarounds; 99#endif 100 101#define OF_WA_CLAIM 1 /* do phys/virt claim separately, then map */ 102#define OF_WA_LONGTRAIL 2 103 104#define PROM_BUG() do { \ 105 prom_printf("kernel BUG at %s line 0x%x!\n", \ 106 RELOC(__FILE__), __LINE__); \ 107 __asm__ __volatile__(".long " BUG_ILLEGAL_INSTR); \ 108} while (0) 109 110#ifdef DEBUG_PROM 111#define prom_debug(x...) prom_printf(x) 112#else 113#define prom_debug(x...) 114#endif 115 116 117typedef u32 prom_arg_t; 118 119struct prom_args { 120 u32 service; 121 u32 nargs; 122 u32 nret; 123 prom_arg_t args[10]; 124}; 125 126struct prom_t { 127 ihandle root; 128 phandle chosen; 129 int cpu; 130 ihandle stdout; 131 ihandle mmumap; 132 ihandle memory; 133}; 134 135struct mem_map_entry { 136 u64 base; 137 u64 size; 138}; 139 140typedef u32 cell_t; 141 142extern void __start(unsigned long r3, unsigned long r4, unsigned long r5); 143 144#ifdef CONFIG_PPC64 145extern int enter_prom(struct prom_args *args, unsigned long entry); 146#else 147static inline int enter_prom(struct prom_args *args, unsigned long entry) 148{ 149 return ((int (*)(struct prom_args *))entry)(args); 150} 151#endif 152 153extern void copy_and_flush(unsigned long dest, unsigned long src, 154 unsigned long size, unsigned long offset); 155 156/* prom structure */ 157static struct prom_t __initdata prom; 158 159static unsigned long prom_entry __initdata; 160 161#define PROM_SCRATCH_SIZE 256 162 163static char __initdata of_stdout_device[256]; 164static char __initdata prom_scratch[PROM_SCRATCH_SIZE]; 165 166static unsigned long __initdata dt_header_start; 167static unsigned long __initdata dt_struct_start, dt_struct_end; 168static unsigned long __initdata dt_string_start, dt_string_end; 169 170static unsigned long __initdata prom_initrd_start, prom_initrd_end; 171 172#ifdef CONFIG_PPC64 173static int __initdata prom_iommu_force_on; 174static int __initdata prom_iommu_off; 175static unsigned long __initdata prom_tce_alloc_start; 176static unsigned long __initdata prom_tce_alloc_end; 177#endif 178 179/* Platforms codes are now obsolete in the kernel. Now only used within this 180 * file and ultimately gone too. Feel free to change them if you need, they 181 * are not shared with anything outside of this file anymore 182 */ 183#define PLATFORM_PSERIES 0x0100 184#define PLATFORM_PSERIES_LPAR 0x0101 185#define PLATFORM_LPAR 0x0001 186#define PLATFORM_POWERMAC 0x0400 187#define PLATFORM_GENERIC 0x0500 188 189static int __initdata of_platform; 190 191static char __initdata prom_cmd_line[COMMAND_LINE_SIZE]; 192 193static unsigned long __initdata prom_memory_limit; 194 195static unsigned long __initdata alloc_top; 196static unsigned long __initdata alloc_top_high; 197static unsigned long __initdata alloc_bottom; 198static unsigned long __initdata rmo_top; 199static unsigned long __initdata ram_top; 200 201static struct mem_map_entry __initdata mem_reserve_map[MEM_RESERVE_MAP_SIZE]; 202static int __initdata mem_reserve_cnt; 203 204static cell_t __initdata regbuf[1024]; 205 206 207/* 208 * Error results ... some OF calls will return "-1" on error, some 209 * will return 0, some will return either. To simplify, here are 210 * macros to use with any ihandle or phandle return value to check if 211 * it is valid 212 */ 213 214#define PROM_ERROR (-1u) 215#define PHANDLE_VALID(p) ((p) != 0 && (p) != PROM_ERROR) 216#define IHANDLE_VALID(i) ((i) != 0 && (i) != PROM_ERROR) 217 218 219/* This is the one and *ONLY* place where we actually call open 220 * firmware. 221 */ 222 223static int __init call_prom(const char *service, int nargs, int nret, ...) 224{ 225 int i; 226 struct prom_args args; 227 va_list list; 228 229 args.service = ADDR(service); 230 args.nargs = nargs; 231 args.nret = nret; 232 233 va_start(list, nret); 234 for (i = 0; i < nargs; i++) 235 args.args[i] = va_arg(list, prom_arg_t); 236 va_end(list); 237 238 for (i = 0; i < nret; i++) 239 args.args[nargs+i] = 0; 240 241 if (enter_prom(&args, RELOC(prom_entry)) < 0) 242 return PROM_ERROR; 243 244 return (nret > 0) ? args.args[nargs] : 0; 245} 246 247static int __init call_prom_ret(const char *service, int nargs, int nret, 248 prom_arg_t *rets, ...) 249{ 250 int i; 251 struct prom_args args; 252 va_list list; 253 254 args.service = ADDR(service); 255 args.nargs = nargs; 256 args.nret = nret; 257 258 va_start(list, rets); 259 for (i = 0; i < nargs; i++) 260 args.args[i] = va_arg(list, prom_arg_t); 261 va_end(list); 262 263 for (i = 0; i < nret; i++) 264 args.args[nargs+i] = 0; 265 266 if (enter_prom(&args, RELOC(prom_entry)) < 0) 267 return PROM_ERROR; 268 269 if (rets != NULL) 270 for (i = 1; i < nret; ++i) 271 rets[i-1] = args.args[nargs+i]; 272 273 return (nret > 0) ? args.args[nargs] : 0; 274} 275 276 277static void __init prom_print(const char *msg) 278{ 279 const char *p, *q; 280 struct prom_t *_prom = &RELOC(prom); 281 282 if (_prom->stdout == 0) 283 return; 284 285 for (p = msg; *p != 0; p = q) { 286 for (q = p; *q != 0 && *q != '\n'; ++q) 287 ; 288 if (q > p) 289 call_prom("write", 3, 1, _prom->stdout, p, q - p); 290 if (*q == 0) 291 break; 292 ++q; 293 call_prom("write", 3, 1, _prom->stdout, ADDR("\r\n"), 2); 294 } 295} 296 297 298static void __init prom_print_hex(unsigned long val) 299{ 300 int i, nibbles = sizeof(val)*2; 301 char buf[sizeof(val)*2+1]; 302 struct prom_t *_prom = &RELOC(prom); 303 304 for (i = nibbles-1; i >= 0; i--) { 305 buf[i] = (val & 0xf) + '0'; 306 if (buf[i] > '9') 307 buf[i] += ('a'-'0'-10); 308 val >>= 4; 309 } 310 buf[nibbles] = '\0'; 311 call_prom("write", 3, 1, _prom->stdout, buf, nibbles); 312} 313 314/* max number of decimal digits in an unsigned long */ 315#define UL_DIGITS 21 316static void __init prom_print_dec(unsigned long val) 317{ 318 int i, size; 319 char buf[UL_DIGITS+1]; 320 struct prom_t *_prom = &RELOC(prom); 321 322 for (i = UL_DIGITS-1; i >= 0; i--) { 323 buf[i] = (val % 10) + '0'; 324 val = val/10; 325 if (val == 0) 326 break; 327 } 328 /* shift stuff down */ 329 size = UL_DIGITS - i; 330 call_prom("write", 3, 1, _prom->stdout, buf+i, size); 331} 332 333static void __init prom_printf(const char *format, ...) 334{ 335 const char *p, *q, *s; 336 va_list args; 337 unsigned long v; 338 struct prom_t *_prom = &RELOC(prom); 339 340 va_start(args, format); 341#ifdef CONFIG_PPC64 342 format = PTRRELOC(format); 343#endif 344 for (p = format; *p != 0; p = q) { 345 for (q = p; *q != 0 && *q != '\n' && *q != '%'; ++q) 346 ; 347 if (q > p) 348 call_prom("write", 3, 1, _prom->stdout, p, q - p); 349 if (*q == 0) 350 break; 351 if (*q == '\n') { 352 ++q; 353 call_prom("write", 3, 1, _prom->stdout, 354 ADDR("\r\n"), 2); 355 continue; 356 } 357 ++q; 358 if (*q == 0) 359 break; 360 switch (*q) { 361 case 's': 362 ++q; 363 s = va_arg(args, const char *); 364 prom_print(s); 365 break; 366 case 'x': 367 ++q; 368 v = va_arg(args, unsigned long); 369 prom_print_hex(v); 370 break; 371 case 'l': 372 ++q; 373 if (*q == 'u') { /* '%lu' */ 374 ++q; 375 v = va_arg(args, unsigned long); 376 prom_print_dec(v); 377 } 378 break; 379 } 380 } 381} 382 383 384static unsigned int __init prom_claim(unsigned long virt, unsigned long size, 385 unsigned long align) 386{ 387 struct prom_t *_prom = &RELOC(prom); 388 389 if (align == 0 && (OF_WORKAROUNDS & OF_WA_CLAIM)) { 390 /* 391 * Old OF requires we claim physical and virtual separately 392 * and then map explicitly (assuming virtual mode) 393 */ 394 int ret; 395 prom_arg_t result; 396 397 ret = call_prom_ret("call-method", 5, 2, &result, 398 ADDR("claim"), _prom->memory, 399 align, size, virt); 400 if (ret != 0 || result == -1) 401 return -1; 402 ret = call_prom_ret("call-method", 5, 2, &result, 403 ADDR("claim"), _prom->mmumap, 404 align, size, virt); 405 if (ret != 0) { 406 call_prom("call-method", 4, 1, ADDR("release"), 407 _prom->memory, size, virt); 408 return -1; 409 } 410 /* the 0x12 is M (coherence) + PP == read/write */ 411 call_prom("call-method", 6, 1, 412 ADDR("map"), _prom->mmumap, 0x12, size, virt, virt); 413 return virt; 414 } 415 return call_prom("claim", 3, 1, (prom_arg_t)virt, (prom_arg_t)size, 416 (prom_arg_t)align); 417} 418 419static void __init __attribute__((noreturn)) prom_panic(const char *reason) 420{ 421#ifdef CONFIG_PPC64 422 reason = PTRRELOC(reason); 423#endif 424 prom_print(reason); 425 /* Do not call exit because it clears the screen on pmac 426 * it also causes some sort of double-fault on early pmacs */ 427 if (RELOC(of_platform) == PLATFORM_POWERMAC) 428 asm("trap\n"); 429 430 /* ToDo: should put up an SRC here on p/iSeries */ 431 call_prom("exit", 0, 0); 432 433 for (;;) /* should never get here */ 434 ; 435} 436 437 438static int __init prom_next_node(phandle *nodep) 439{ 440 phandle node; 441 442 if ((node = *nodep) != 0 443 && (*nodep = call_prom("child", 1, 1, node)) != 0) 444 return 1; 445 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 446 return 1; 447 for (;;) { 448 if ((node = call_prom("parent", 1, 1, node)) == 0) 449 return 0; 450 if ((*nodep = call_prom("peer", 1, 1, node)) != 0) 451 return 1; 452 } 453} 454 455static int inline prom_getprop(phandle node, const char *pname, 456 void *value, size_t valuelen) 457{ 458 return call_prom("getprop", 4, 1, node, ADDR(pname), 459 (u32)(unsigned long) value, (u32) valuelen); 460} 461 462static int inline prom_getproplen(phandle node, const char *pname) 463{ 464 return call_prom("getproplen", 2, 1, node, ADDR(pname)); 465} 466 467static void add_string(char **str, const char *q) 468{ 469 char *p = *str; 470 471 while (*q) 472 *p++ = *q++; 473 *p++ = ' '; 474 *str = p; 475} 476 477static char *tohex(unsigned int x) 478{ 479 static char digits[] = "0123456789abcdef"; 480 static char result[9]; 481 int i; 482 483 result[8] = 0; 484 i = 8; 485 do { 486 --i; 487 result[i] = digits[x & 0xf]; 488 x >>= 4; 489 } while (x != 0 && i > 0); 490 return &result[i]; 491} 492 493static int __init prom_setprop(phandle node, const char *nodename, 494 const char *pname, void *value, size_t valuelen) 495{ 496 char cmd[256], *p; 497 498 if (!(OF_WORKAROUNDS & OF_WA_LONGTRAIL)) 499 return call_prom("setprop", 4, 1, node, ADDR(pname), 500 (u32)(unsigned long) value, (u32) valuelen); 501 502 /* gah... setprop doesn't work on longtrail, have to use interpret */ 503 p = cmd; 504 add_string(&p, "dev"); 505 add_string(&p, nodename); 506 add_string(&p, tohex((u32)(unsigned long) value)); 507 add_string(&p, tohex(valuelen)); 508 add_string(&p, tohex(ADDR(pname))); 509 add_string(&p, tohex(strlen(RELOC(pname)))); 510 add_string(&p, "property"); 511 *p = 0; 512 return call_prom("interpret", 1, 1, (u32)(unsigned long) cmd); 513} 514 515/* We can't use the standard versions because of RELOC headaches. */ 516#define isxdigit(c) (('0' <= (c) && (c) <= '9') \ 517 || ('a' <= (c) && (c) <= 'f') \ 518 || ('A' <= (c) && (c) <= 'F')) 519 520#define isdigit(c) ('0' <= (c) && (c) <= '9') 521#define islower(c) ('a' <= (c) && (c) <= 'z') 522#define toupper(c) (islower(c) ? ((c) - 'a' + 'A') : (c)) 523 524unsigned long prom_strtoul(const char *cp, const char **endp) 525{ 526 unsigned long result = 0, base = 10, value; 527 528 if (*cp == '0') { 529 base = 8; 530 cp++; 531 if (toupper(*cp) == 'X') { 532 cp++; 533 base = 16; 534 } 535 } 536 537 while (isxdigit(*cp) && 538 (value = isdigit(*cp) ? *cp - '0' : toupper(*cp) - 'A' + 10) < base) { 539 result = result * base + value; 540 cp++; 541 } 542 543 if (endp) 544 *endp = cp; 545 546 return result; 547} 548 549unsigned long prom_memparse(const char *ptr, const char **retptr) 550{ 551 unsigned long ret = prom_strtoul(ptr, retptr); 552 int shift = 0; 553 554 /* 555 * We can't use a switch here because GCC *may* generate a 556 * jump table which won't work, because we're not running at 557 * the address we're linked at. 558 */ 559 if ('G' == **retptr || 'g' == **retptr) 560 shift = 30; 561 562 if ('M' == **retptr || 'm' == **retptr) 563 shift = 20; 564 565 if ('K' == **retptr || 'k' == **retptr) 566 shift = 10; 567 568 if (shift) { 569 ret <<= shift; 570 (*retptr)++; 571 } 572 573 return ret; 574} 575 576/* 577 * Early parsing of the command line passed to the kernel, used for 578 * "mem=x" and the options that affect the iommu 579 */ 580static void __init early_cmdline_parse(void) 581{ 582 struct prom_t *_prom = &RELOC(prom); 583 const char *opt; 584 585 char *p; 586 int l = 0; 587 588 RELOC(prom_cmd_line[0]) = 0; 589 p = RELOC(prom_cmd_line); 590 if ((long)_prom->chosen > 0) 591 l = prom_getprop(_prom->chosen, "bootargs", p, COMMAND_LINE_SIZE-1); 592#ifdef CONFIG_CMDLINE 593 if (l <= 0 || p[0] == '\0') /* dbl check */ 594 strlcpy(RELOC(prom_cmd_line), 595 RELOC(CONFIG_CMDLINE), sizeof(prom_cmd_line)); 596#endif /* CONFIG_CMDLINE */ 597 prom_printf("command line: %s\n", RELOC(prom_cmd_line)); 598 599#ifdef CONFIG_PPC64 600 opt = strstr(RELOC(prom_cmd_line), RELOC("iommu=")); 601 if (opt) { 602 prom_printf("iommu opt is: %s\n", opt); 603 opt += 6; 604 while (*opt && *opt == ' ') 605 opt++; 606 if (!strncmp(opt, RELOC("off"), 3)) 607 RELOC(prom_iommu_off) = 1; 608 else if (!strncmp(opt, RELOC("force"), 5)) 609 RELOC(prom_iommu_force_on) = 1; 610 } 611#endif 612 opt = strstr(RELOC(prom_cmd_line), RELOC("mem=")); 613 if (opt) { 614 opt += 4; 615 RELOC(prom_memory_limit) = prom_memparse(opt, (const char **)&opt); 616#ifdef CONFIG_PPC64 617 /* Align to 16 MB == size of ppc64 large page */ 618 RELOC(prom_memory_limit) = ALIGN(RELOC(prom_memory_limit), 0x1000000); 619#endif 620 } 621} 622 623#ifdef CONFIG_PPC_PSERIES 624/* 625 * There are two methods for telling firmware what our capabilities are. 626 * Newer machines have an "ibm,client-architecture-support" method on the 627 * root node. For older machines, we have to call the "process-elf-header" 628 * method in the /packages/elf-loader node, passing it a fake 32-bit 629 * ELF header containing a couple of PT_NOTE sections that contain 630 * structures that contain various information. 631 */ 632 633/* 634 * New method - extensible architecture description vector. 635 * 636 * Because the description vector contains a mix of byte and word 637 * values, we declare it as an unsigned char array, and use this 638 * macro to put word values in. 639 */ 640#define W(x) ((x) >> 24) & 0xff, ((x) >> 16) & 0xff, \ 641 ((x) >> 8) & 0xff, (x) & 0xff 642 643/* Option vector bits - generic bits in byte 1 */ 644#define OV_IGNORE 0x80 /* ignore this vector */ 645#define OV_CESSATION_POLICY 0x40 /* halt if unsupported option present*/ 646 647/* Option vector 1: processor architectures supported */ 648#define OV1_PPC_2_00 0x80 /* set if we support PowerPC 2.00 */ 649#define OV1_PPC_2_01 0x40 /* set if we support PowerPC 2.01 */ 650#define OV1_PPC_2_02 0x20 /* set if we support PowerPC 2.02 */ 651#define OV1_PPC_2_03 0x10 /* set if we support PowerPC 2.03 */ 652#define OV1_PPC_2_04 0x08 /* set if we support PowerPC 2.04 */ 653#define OV1_PPC_2_05 0x04 /* set if we support PowerPC 2.05 */ 654#define OV1_PPC_2_06 0x02 /* set if we support PowerPC 2.06 */ 655 656/* Option vector 2: Open Firmware options supported */ 657#define OV2_REAL_MODE 0x20 /* set if we want OF in real mode */ 658 659/* Option vector 3: processor options supported */ 660#define OV3_FP 0x80 /* floating point */ 661#define OV3_VMX 0x40 /* VMX/Altivec */ 662#define OV3_DFP 0x20 /* decimal FP */ 663 664/* Option vector 5: PAPR/OF options supported */ 665#define OV5_LPAR 0x80 /* logical partitioning supported */ 666#define OV5_SPLPAR 0x40 /* shared-processor LPAR supported */ 667/* ibm,dynamic-reconfiguration-memory property supported */ 668#define OV5_DRCONF_MEMORY 0x20 669#define OV5_LARGE_PAGES 0x10 /* large pages supported */ 670#define OV5_DONATE_DEDICATE_CPU 0x02 /* donate dedicated CPU support */ 671/* PCIe/MSI support. Without MSI full PCIe is not supported */ 672#ifdef CONFIG_PCI_MSI 673#define OV5_MSI 0x01 /* PCIe/MSI support */ 674#else 675#define OV5_MSI 0x00 676#endif /* CONFIG_PCI_MSI */ 677#ifdef CONFIG_PPC_SMLPAR 678#define OV5_CMO 0x80 /* Cooperative Memory Overcommitment */ 679#else 680#define OV5_CMO 0x00 681#endif 682#define OV5_TYPE1_AFFINITY 0x80 /* Type 1 NUMA affinity */ 683 684/* Option Vector 6: IBM PAPR hints */ 685#define OV6_LINUX 0x02 /* Linux is our OS */ 686 687/* 688 * The architecture vector has an array of PVR mask/value pairs, 689 * followed by # option vectors - 1, followed by the option vectors. 690 */ 691static unsigned char ibm_architecture_vec[] = { 692 W(0xfffe0000), W(0x003a0000), /* POWER5/POWER5+ */ 693 W(0xffff0000), W(0x003e0000), /* POWER6 */ 694 W(0xffff0000), W(0x003f0000), /* POWER7 */ 695 W(0xffffffff), W(0x0f000003), /* all 2.06-compliant */ 696 W(0xffffffff), W(0x0f000002), /* all 2.05-compliant */ 697 W(0xfffffffe), W(0x0f000001), /* all 2.04-compliant and earlier */ 698 6 - 1, /* 6 option vectors */ 699 700 /* option vector 1: processor architectures supported */ 701 3 - 2, /* length */ 702 0, /* don't ignore, don't halt */ 703 OV1_PPC_2_00 | OV1_PPC_2_01 | OV1_PPC_2_02 | OV1_PPC_2_03 | 704 OV1_PPC_2_04 | OV1_PPC_2_05 | OV1_PPC_2_06, 705 706 /* option vector 2: Open Firmware options supported */ 707 34 - 2, /* length */ 708 OV2_REAL_MODE, 709 0, 0, 710 W(0xffffffff), /* real_base */ 711 W(0xffffffff), /* real_size */ 712 W(0xffffffff), /* virt_base */ 713 W(0xffffffff), /* virt_size */ 714 W(0xffffffff), /* load_base */ 715 W(64), /* 64MB min RMA */ 716 W(0xffffffff), /* full client load */ 717 0, /* min RMA percentage of total RAM */ 718 48, /* max log_2(hash table size) */ 719 720 /* option vector 3: processor options supported */ 721 3 - 2, /* length */ 722 0, /* don't ignore, don't halt */ 723 OV3_FP | OV3_VMX | OV3_DFP, 724 725 /* option vector 4: IBM PAPR implementation */ 726 2 - 2, /* length */ 727 0, /* don't halt */ 728 729 /* option vector 5: PAPR/OF options */ 730 13 - 2, /* length */ 731 0, /* don't ignore, don't halt */ 732 OV5_LPAR | OV5_SPLPAR | OV5_LARGE_PAGES | OV5_DRCONF_MEMORY | 733 OV5_DONATE_DEDICATE_CPU | OV5_MSI, 734 0, 735 OV5_CMO, 736 OV5_TYPE1_AFFINITY, 737 0, 738 0, 739 0, 740 /* WARNING: The offset of the "number of cores" field below 741 * must match by the macro below. Update the definition if 742 * the structure layout changes. 743 */ 744#define IBM_ARCH_VEC_NRCORES_OFFSET 100 745 W(NR_CPUS), /* number of cores supported */ 746 747 /* option vector 6: IBM PAPR hints */ 748 4 - 2, /* length */ 749 0, 750 0, 751 OV6_LINUX, 752 753}; 754 755/* Old method - ELF header with PT_NOTE sections */ 756static struct fake_elf { 757 Elf32_Ehdr elfhdr; 758 Elf32_Phdr phdr[2]; 759 struct chrpnote { 760 u32 namesz; 761 u32 descsz; 762 u32 type; 763 char name[8]; /* "PowerPC" */ 764 struct chrpdesc { 765 u32 real_mode; 766 u32 real_base; 767 u32 real_size; 768 u32 virt_base; 769 u32 virt_size; 770 u32 load_base; 771 } chrpdesc; 772 } chrpnote; 773 struct rpanote { 774 u32 namesz; 775 u32 descsz; 776 u32 type; 777 char name[24]; /* "IBM,RPA-Client-Config" */ 778 struct rpadesc { 779 u32 lpar_affinity; 780 u32 min_rmo_size; 781 u32 min_rmo_percent; 782 u32 max_pft_size; 783 u32 splpar; 784 u32 min_load; 785 u32 new_mem_def; 786 u32 ignore_me; 787 } rpadesc; 788 } rpanote; 789} fake_elf = { 790 .elfhdr = { 791 .e_ident = { 0x7f, 'E', 'L', 'F', 792 ELFCLASS32, ELFDATA2MSB, EV_CURRENT }, 793 .e_type = ET_EXEC, /* yeah right */ 794 .e_machine = EM_PPC, 795 .e_version = EV_CURRENT, 796 .e_phoff = offsetof(struct fake_elf, phdr), 797 .e_phentsize = sizeof(Elf32_Phdr), 798 .e_phnum = 2 799 }, 800 .phdr = { 801 [0] = { 802 .p_type = PT_NOTE, 803 .p_offset = offsetof(struct fake_elf, chrpnote), 804 .p_filesz = sizeof(struct chrpnote) 805 }, [1] = { 806 .p_type = PT_NOTE, 807 .p_offset = offsetof(struct fake_elf, rpanote), 808 .p_filesz = sizeof(struct rpanote) 809 } 810 }, 811 .chrpnote = { 812 .namesz = sizeof("PowerPC"), 813 .descsz = sizeof(struct chrpdesc), 814 .type = 0x1275, 815 .name = "PowerPC", 816 .chrpdesc = { 817 .real_mode = ~0U, /* ~0 means "don't care" */ 818 .real_base = ~0U, 819 .real_size = ~0U, 820 .virt_base = ~0U, 821 .virt_size = ~0U, 822 .load_base = ~0U 823 }, 824 }, 825 .rpanote = { 826 .namesz = sizeof("IBM,RPA-Client-Config"), 827 .descsz = sizeof(struct rpadesc), 828 .type = 0x12759999, 829 .name = "IBM,RPA-Client-Config", 830 .rpadesc = { 831 .lpar_affinity = 0, 832 .min_rmo_size = 64, /* in megabytes */ 833 .min_rmo_percent = 0, 834 .max_pft_size = 48, /* 2^48 bytes max PFT size */ 835 .splpar = 1, 836 .min_load = ~0U, 837 .new_mem_def = 0 838 } 839 } 840}; 841 842static int __init prom_count_smt_threads(void) 843{ 844 phandle node; 845 char type[64]; 846 unsigned int plen; 847 848 /* Pick up th first CPU node we can find */ 849 for (node = 0; prom_next_node(&node); ) { 850 type[0] = 0; 851 prom_getprop(node, "device_type", type, sizeof(type)); 852 853 if (strcmp(type, RELOC("cpu"))) 854 continue; 855 /* 856 * There is an entry for each smt thread, each entry being 857 * 4 bytes long. All cpus should have the same number of 858 * smt threads, so return after finding the first. 859 */ 860 plen = prom_getproplen(node, "ibm,ppc-interrupt-server#s"); 861 if (plen == PROM_ERROR) 862 break; 863 plen >>= 2; 864 prom_debug("Found %lu smt threads per core\n", (unsigned long)plen); 865 866 /* Sanity check */ 867 if (plen < 1 || plen > 64) { 868 prom_printf("Threads per core %lu out of bounds, assuming 1\n", 869 (unsigned long)plen); 870 return 1; 871 } 872 return plen; 873 } 874 prom_debug("No threads found, assuming 1 per core\n"); 875 876 return 1; 877 878} 879 880 881static void __init prom_send_capabilities(void) 882{ 883 ihandle elfloader, root; 884 prom_arg_t ret; 885 u32 *cores; 886 887 root = call_prom("open", 1, 1, ADDR("/")); 888 if (root != 0) { 889 /* We need to tell the FW about the number of cores we support. 890 * 891 * To do that, we count the number of threads on the first core 892 * (we assume this is the same for all cores) and use it to 893 * divide NR_CPUS. 894 */ 895 cores = (u32 *)PTRRELOC(&ibm_architecture_vec[IBM_ARCH_VEC_NRCORES_OFFSET]); 896 if (*cores != NR_CPUS) { 897 prom_printf("WARNING ! " 898 "ibm_architecture_vec structure inconsistent: %lu!\n", 899 *cores); 900 } else { 901 *cores = DIV_ROUND_UP(NR_CPUS, prom_count_smt_threads()); 902 prom_printf("Max number of cores passed to firmware: %lu (NR_CPUS = %lu)\n", 903 *cores, NR_CPUS); 904 } 905 906 /* try calling the ibm,client-architecture-support method */ 907 prom_printf("Calling ibm,client-architecture-support..."); 908 if (call_prom_ret("call-method", 3, 2, &ret, 909 ADDR("ibm,client-architecture-support"), 910 root, 911 ADDR(ibm_architecture_vec)) == 0) { 912 /* the call exists... */ 913 if (ret) 914 prom_printf("\nWARNING: ibm,client-architecture" 915 "-support call FAILED!\n"); 916 call_prom("close", 1, 0, root); 917 prom_printf(" done\n"); 918 return; 919 } 920 call_prom("close", 1, 0, root); 921 prom_printf(" not implemented\n"); 922 } 923 924 /* no ibm,client-architecture-support call, try the old way */ 925 elfloader = call_prom("open", 1, 1, ADDR("/packages/elf-loader")); 926 if (elfloader == 0) { 927 prom_printf("couldn't open /packages/elf-loader\n"); 928 return; 929 } 930 call_prom("call-method", 3, 1, ADDR("process-elf-header"), 931 elfloader, ADDR(&fake_elf)); 932 call_prom("close", 1, 0, elfloader); 933} 934#endif 935 936/* 937 * Memory allocation strategy... our layout is normally: 938 * 939 * at 14Mb or more we have vmlinux, then a gap and initrd. In some 940 * rare cases, initrd might end up being before the kernel though. 941 * We assume this won't override the final kernel at 0, we have no 942 * provision to handle that in this version, but it should hopefully 943 * never happen. 944 * 945 * alloc_top is set to the top of RMO, eventually shrink down if the 946 * TCEs overlap 947 * 948 * alloc_bottom is set to the top of kernel/initrd 949 * 950 * from there, allocations are done this way : rtas is allocated 951 * topmost, and the device-tree is allocated from the bottom. We try 952 * to grow the device-tree allocation as we progress. If we can't, 953 * then we fail, we don't currently have a facility to restart 954 * elsewhere, but that shouldn't be necessary. 955 * 956 * Note that calls to reserve_mem have to be done explicitly, memory 957 * allocated with either alloc_up or alloc_down isn't automatically 958 * reserved. 959 */ 960 961 962/* 963 * Allocates memory in the RMO upward from the kernel/initrd 964 * 965 * When align is 0, this is a special case, it means to allocate in place 966 * at the current location of alloc_bottom or fail (that is basically 967 * extending the previous allocation). Used for the device-tree flattening 968 */ 969static unsigned long __init alloc_up(unsigned long size, unsigned long align) 970{ 971 unsigned long base = RELOC(alloc_bottom); 972 unsigned long addr = 0; 973 974 if (align) 975 base = _ALIGN_UP(base, align); 976 prom_debug("alloc_up(%x, %x)\n", size, align); 977 if (RELOC(ram_top) == 0) 978 prom_panic("alloc_up() called with mem not initialized\n"); 979 980 if (align) 981 base = _ALIGN_UP(RELOC(alloc_bottom), align); 982 else 983 base = RELOC(alloc_bottom); 984 985 for(; (base + size) <= RELOC(alloc_top); 986 base = _ALIGN_UP(base + 0x100000, align)) { 987 prom_debug(" trying: 0x%x\n\r", base); 988 addr = (unsigned long)prom_claim(base, size, 0); 989 if (addr != PROM_ERROR && addr != 0) 990 break; 991 addr = 0; 992 if (align == 0) 993 break; 994 } 995 if (addr == 0) 996 return 0; 997 RELOC(alloc_bottom) = addr; 998 999 prom_debug(" -> %x\n", addr); 1000 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1001 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 1002 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1003 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 1004 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 1005 1006 return addr; 1007} 1008 1009/* 1010 * Allocates memory downward, either from top of RMO, or if highmem 1011 * is set, from the top of RAM. Note that this one doesn't handle 1012 * failures. It does claim memory if highmem is not set. 1013 */ 1014static unsigned long __init alloc_down(unsigned long size, unsigned long align, 1015 int highmem) 1016{ 1017 unsigned long base, addr = 0; 1018 1019 prom_debug("alloc_down(%x, %x, %s)\n", size, align, 1020 highmem ? RELOC("(high)") : RELOC("(low)")); 1021 if (RELOC(ram_top) == 0) 1022 prom_panic("alloc_down() called with mem not initialized\n"); 1023 1024 if (highmem) { 1025 /* Carve out storage for the TCE table. */ 1026 addr = _ALIGN_DOWN(RELOC(alloc_top_high) - size, align); 1027 if (addr <= RELOC(alloc_bottom)) 1028 return 0; 1029 /* Will we bump into the RMO ? If yes, check out that we 1030 * didn't overlap existing allocations there, if we did, 1031 * we are dead, we must be the first in town ! 1032 */ 1033 if (addr < RELOC(rmo_top)) { 1034 /* Good, we are first */ 1035 if (RELOC(alloc_top) == RELOC(rmo_top)) 1036 RELOC(alloc_top) = RELOC(rmo_top) = addr; 1037 else 1038 return 0; 1039 } 1040 RELOC(alloc_top_high) = addr; 1041 goto bail; 1042 } 1043 1044 base = _ALIGN_DOWN(RELOC(alloc_top) - size, align); 1045 for (; base > RELOC(alloc_bottom); 1046 base = _ALIGN_DOWN(base - 0x100000, align)) { 1047 prom_debug(" trying: 0x%x\n\r", base); 1048 addr = (unsigned long)prom_claim(base, size, 0); 1049 if (addr != PROM_ERROR && addr != 0) 1050 break; 1051 addr = 0; 1052 } 1053 if (addr == 0) 1054 return 0; 1055 RELOC(alloc_top) = addr; 1056 1057 bail: 1058 prom_debug(" -> %x\n", addr); 1059 prom_debug(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1060 prom_debug(" alloc_top : %x\n", RELOC(alloc_top)); 1061 prom_debug(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1062 prom_debug(" rmo_top : %x\n", RELOC(rmo_top)); 1063 prom_debug(" ram_top : %x\n", RELOC(ram_top)); 1064 1065 return addr; 1066} 1067 1068/* 1069 * Parse a "reg" cell 1070 */ 1071static unsigned long __init prom_next_cell(int s, cell_t **cellp) 1072{ 1073 cell_t *p = *cellp; 1074 unsigned long r = 0; 1075 1076 /* Ignore more than 2 cells */ 1077 while (s > sizeof(unsigned long) / 4) { 1078 p++; 1079 s--; 1080 } 1081 r = *p++; 1082#ifdef CONFIG_PPC64 1083 if (s > 1) { 1084 r <<= 32; 1085 r |= *(p++); 1086 } 1087#endif 1088 *cellp = p; 1089 return r; 1090} 1091 1092static void __init reserve_mem(u64 base, u64 size) 1093{ 1094 u64 top = base + size; 1095 unsigned long cnt = RELOC(mem_reserve_cnt); 1096 1097 if (size == 0) 1098 return; 1099 1100 /* We need to always keep one empty entry so that we 1101 * have our terminator with "size" set to 0 since we are 1102 * dumb and just copy this entire array to the boot params 1103 */ 1104 base = _ALIGN_DOWN(base, PAGE_SIZE); 1105 top = _ALIGN_UP(top, PAGE_SIZE); 1106 size = top - base; 1107 1108 if (cnt >= (MEM_RESERVE_MAP_SIZE - 1)) 1109 prom_panic("Memory reserve map exhausted !\n"); 1110 RELOC(mem_reserve_map)[cnt].base = base; 1111 RELOC(mem_reserve_map)[cnt].size = size; 1112 RELOC(mem_reserve_cnt) = cnt + 1; 1113} 1114 1115/* 1116 * Initialize memory allocation mechanism, parse "memory" nodes and 1117 * obtain that way the top of memory and RMO to setup out local allocator 1118 */ 1119static void __init prom_init_mem(void) 1120{ 1121 phandle node; 1122 char *path, type[64]; 1123 unsigned int plen; 1124 cell_t *p, *endp; 1125 struct prom_t *_prom = &RELOC(prom); 1126 u32 rac, rsc; 1127 1128 /* 1129 * We iterate the memory nodes to find 1130 * 1) top of RMO (first node) 1131 * 2) top of memory 1132 */ 1133 rac = 2; 1134 prom_getprop(_prom->root, "#address-cells", &rac, sizeof(rac)); 1135 rsc = 1; 1136 prom_getprop(_prom->root, "#size-cells", &rsc, sizeof(rsc)); 1137 prom_debug("root_addr_cells: %x\n", (unsigned long) rac); 1138 prom_debug("root_size_cells: %x\n", (unsigned long) rsc); 1139 1140 prom_debug("scanning memory:\n"); 1141 path = RELOC(prom_scratch); 1142 1143 for (node = 0; prom_next_node(&node); ) { 1144 type[0] = 0; 1145 prom_getprop(node, "device_type", type, sizeof(type)); 1146 1147 if (type[0] == 0) { 1148 /* 1149 * CHRP Longtrail machines have no device_type 1150 * on the memory node, so check the name instead... 1151 */ 1152 prom_getprop(node, "name", type, sizeof(type)); 1153 } 1154 if (strcmp(type, RELOC("memory"))) 1155 continue; 1156 1157 plen = prom_getprop(node, "reg", RELOC(regbuf), sizeof(regbuf)); 1158 if (plen > sizeof(regbuf)) { 1159 prom_printf("memory node too large for buffer !\n"); 1160 plen = sizeof(regbuf); 1161 } 1162 p = RELOC(regbuf); 1163 endp = p + (plen / sizeof(cell_t)); 1164 1165#ifdef DEBUG_PROM 1166 memset(path, 0, PROM_SCRATCH_SIZE); 1167 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1168 prom_debug(" node %s :\n", path); 1169#endif /* DEBUG_PROM */ 1170 1171 while ((endp - p) >= (rac + rsc)) { 1172 unsigned long base, size; 1173 1174 base = prom_next_cell(rac, &p); 1175 size = prom_next_cell(rsc, &p); 1176 1177 if (size == 0) 1178 continue; 1179 prom_debug(" %x %x\n", base, size); 1180 if (base == 0 && (RELOC(of_platform) & PLATFORM_LPAR)) 1181 RELOC(rmo_top) = size; 1182 if ((base + size) > RELOC(ram_top)) 1183 RELOC(ram_top) = base + size; 1184 } 1185 } 1186 1187 RELOC(alloc_bottom) = PAGE_ALIGN((unsigned long)&RELOC(_end) + 0x4000); 1188 1189 /* Check if we have an initrd after the kernel, if we do move our bottom 1190 * point to after it 1191 */ 1192 if (RELOC(prom_initrd_start)) { 1193 if (RELOC(prom_initrd_end) > RELOC(alloc_bottom)) 1194 RELOC(alloc_bottom) = PAGE_ALIGN(RELOC(prom_initrd_end)); 1195 } 1196 1197 /* 1198 * If prom_memory_limit is set we reduce the upper limits *except* for 1199 * alloc_top_high. This must be the real top of RAM so we can put 1200 * TCE's up there. 1201 */ 1202 1203 RELOC(alloc_top_high) = RELOC(ram_top); 1204 1205 if (RELOC(prom_memory_limit)) { 1206 if (RELOC(prom_memory_limit) <= RELOC(alloc_bottom)) { 1207 prom_printf("Ignoring mem=%x <= alloc_bottom.\n", 1208 RELOC(prom_memory_limit)); 1209 RELOC(prom_memory_limit) = 0; 1210 } else if (RELOC(prom_memory_limit) >= RELOC(ram_top)) { 1211 prom_printf("Ignoring mem=%x >= ram_top.\n", 1212 RELOC(prom_memory_limit)); 1213 RELOC(prom_memory_limit) = 0; 1214 } else { 1215 RELOC(ram_top) = RELOC(prom_memory_limit); 1216 RELOC(rmo_top) = min(RELOC(rmo_top), RELOC(prom_memory_limit)); 1217 } 1218 } 1219 1220 if (!RELOC(rmo_top)) 1221 RELOC(rmo_top) = RELOC(ram_top); 1222 RELOC(rmo_top) = min(0x30000000ul, RELOC(rmo_top)); 1223 RELOC(alloc_top) = RELOC(rmo_top); 1224 RELOC(alloc_top_high) = RELOC(ram_top); 1225 1226 prom_printf("memory layout at init:\n"); 1227 prom_printf(" memory_limit : %x (16 MB aligned)\n", RELOC(prom_memory_limit)); 1228 prom_printf(" alloc_bottom : %x\n", RELOC(alloc_bottom)); 1229 prom_printf(" alloc_top : %x\n", RELOC(alloc_top)); 1230 prom_printf(" alloc_top_hi : %x\n", RELOC(alloc_top_high)); 1231 prom_printf(" rmo_top : %x\n", RELOC(rmo_top)); 1232 prom_printf(" ram_top : %x\n", RELOC(ram_top)); 1233} 1234 1235 1236/* 1237 * Allocate room for and instantiate RTAS 1238 */ 1239static void __init prom_instantiate_rtas(void) 1240{ 1241 phandle rtas_node; 1242 ihandle rtas_inst; 1243 u32 base, entry = 0; 1244 u32 size = 0; 1245 1246 prom_debug("prom_instantiate_rtas: start...\n"); 1247 1248 rtas_node = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1249 prom_debug("rtas_node: %x\n", rtas_node); 1250 if (!PHANDLE_VALID(rtas_node)) 1251 return; 1252 1253 prom_getprop(rtas_node, "rtas-size", &size, sizeof(size)); 1254 if (size == 0) 1255 return; 1256 1257 base = alloc_down(size, PAGE_SIZE, 0); 1258 if (base == 0) { 1259 prom_printf("RTAS allocation failed !\n"); 1260 return; 1261 } 1262 1263 rtas_inst = call_prom("open", 1, 1, ADDR("/rtas")); 1264 if (!IHANDLE_VALID(rtas_inst)) { 1265 prom_printf("opening rtas package failed (%x)\n", rtas_inst); 1266 return; 1267 } 1268 1269 prom_printf("instantiating rtas at 0x%x...", base); 1270 1271 if (call_prom_ret("call-method", 3, 2, &entry, 1272 ADDR("instantiate-rtas"), 1273 rtas_inst, base) != 0 1274 || entry == 0) { 1275 prom_printf(" failed\n"); 1276 return; 1277 } 1278 prom_printf(" done\n"); 1279 1280 reserve_mem(base, size); 1281 1282 prom_setprop(rtas_node, "/rtas", "linux,rtas-base", 1283 &base, sizeof(base)); 1284 prom_setprop(rtas_node, "/rtas", "linux,rtas-entry", 1285 &entry, sizeof(entry)); 1286 1287 prom_debug("rtas base = 0x%x\n", base); 1288 prom_debug("rtas entry = 0x%x\n", entry); 1289 prom_debug("rtas size = 0x%x\n", (long)size); 1290 1291 prom_debug("prom_instantiate_rtas: end...\n"); 1292} 1293 1294#ifdef CONFIG_PPC64 1295/* 1296 * Allocate room for and initialize TCE tables 1297 */ 1298static void __init prom_initialize_tce_table(void) 1299{ 1300 phandle node; 1301 ihandle phb_node; 1302 char compatible[64], type[64], model[64]; 1303 char *path = RELOC(prom_scratch); 1304 u64 base, align; 1305 u32 minalign, minsize; 1306 u64 tce_entry, *tce_entryp; 1307 u64 local_alloc_top, local_alloc_bottom; 1308 u64 i; 1309 1310 if (RELOC(prom_iommu_off)) 1311 return; 1312 1313 prom_debug("starting prom_initialize_tce_table\n"); 1314 1315 /* Cache current top of allocs so we reserve a single block */ 1316 local_alloc_top = RELOC(alloc_top_high); 1317 local_alloc_bottom = local_alloc_top; 1318 1319 /* Search all nodes looking for PHBs. */ 1320 for (node = 0; prom_next_node(&node); ) { 1321 compatible[0] = 0; 1322 type[0] = 0; 1323 model[0] = 0; 1324 prom_getprop(node, "compatible", 1325 compatible, sizeof(compatible)); 1326 prom_getprop(node, "device_type", type, sizeof(type)); 1327 prom_getprop(node, "model", model, sizeof(model)); 1328 1329 if ((type[0] == 0) || (strstr(type, RELOC("pci")) == NULL)) 1330 continue; 1331 1332 /* Keep the old logic intact to avoid regression. */ 1333 if (compatible[0] != 0) { 1334 if ((strstr(compatible, RELOC("python")) == NULL) && 1335 (strstr(compatible, RELOC("Speedwagon")) == NULL) && 1336 (strstr(compatible, RELOC("Winnipeg")) == NULL)) 1337 continue; 1338 } else if (model[0] != 0) { 1339 if ((strstr(model, RELOC("ython")) == NULL) && 1340 (strstr(model, RELOC("peedwagon")) == NULL) && 1341 (strstr(model, RELOC("innipeg")) == NULL)) 1342 continue; 1343 } 1344 1345 if (prom_getprop(node, "tce-table-minalign", &minalign, 1346 sizeof(minalign)) == PROM_ERROR) 1347 minalign = 0; 1348 if (prom_getprop(node, "tce-table-minsize", &minsize, 1349 sizeof(minsize)) == PROM_ERROR) 1350 minsize = 4UL << 20; 1351 1352 /* 1353 * Even though we read what OF wants, we just set the table 1354 * size to 4 MB. This is enough to map 2GB of PCI DMA space. 1355 * By doing this, we avoid the pitfalls of trying to DMA to 1356 * MMIO space and the DMA alias hole. 1357 * 1358 * On POWER4, firmware sets the TCE region by assuming 1359 * each TCE table is 8MB. Using this memory for anything 1360 * else will impact performance, so we always allocate 8MB. 1361 * Anton 1362 */ 1363 if (__is_processor(PV_POWER4) || __is_processor(PV_POWER4p)) 1364 minsize = 8UL << 20; 1365 else 1366 minsize = 4UL << 20; 1367 1368 /* Align to the greater of the align or size */ 1369 align = max(minalign, minsize); 1370 base = alloc_down(minsize, align, 1); 1371 if (base == 0) 1372 prom_panic("ERROR, cannot find space for TCE table.\n"); 1373 if (base < local_alloc_bottom) 1374 local_alloc_bottom = base; 1375 1376 /* It seems OF doesn't null-terminate the path :-( */ 1377 memset(path, 0, PROM_SCRATCH_SIZE); 1378 /* Call OF to setup the TCE hardware */ 1379 if (call_prom("package-to-path", 3, 1, node, 1380 path, PROM_SCRATCH_SIZE-1) == PROM_ERROR) { 1381 prom_printf("package-to-path failed\n"); 1382 } 1383 1384 /* Save away the TCE table attributes for later use. */ 1385 prom_setprop(node, path, "linux,tce-base", &base, sizeof(base)); 1386 prom_setprop(node, path, "linux,tce-size", &minsize, sizeof(minsize)); 1387 1388 prom_debug("TCE table: %s\n", path); 1389 prom_debug("\tnode = 0x%x\n", node); 1390 prom_debug("\tbase = 0x%x\n", base); 1391 prom_debug("\tsize = 0x%x\n", minsize); 1392 1393 /* Initialize the table to have a one-to-one mapping 1394 * over the allocated size. 1395 */ 1396 tce_entryp = (u64 *)base; 1397 for (i = 0; i < (minsize >> 3) ;tce_entryp++, i++) { 1398 tce_entry = (i << PAGE_SHIFT); 1399 tce_entry |= 0x3; 1400 *tce_entryp = tce_entry; 1401 } 1402 1403 prom_printf("opening PHB %s", path); 1404 phb_node = call_prom("open", 1, 1, path); 1405 if (phb_node == 0) 1406 prom_printf("... failed\n"); 1407 else 1408 prom_printf("... done\n"); 1409 1410 call_prom("call-method", 6, 0, ADDR("set-64-bit-addressing"), 1411 phb_node, -1, minsize, 1412 (u32) base, (u32) (base >> 32)); 1413 call_prom("close", 1, 0, phb_node); 1414 } 1415 1416 reserve_mem(local_alloc_bottom, local_alloc_top - local_alloc_bottom); 1417 1418 /* These are only really needed if there is a memory limit in 1419 * effect, but we don't know so export them always. */ 1420 RELOC(prom_tce_alloc_start) = local_alloc_bottom; 1421 RELOC(prom_tce_alloc_end) = local_alloc_top; 1422 1423 /* Flag the first invalid entry */ 1424 prom_debug("ending prom_initialize_tce_table\n"); 1425} 1426#endif 1427 1428/* 1429 * With CHRP SMP we need to use the OF to start the other processors. 1430 * We can't wait until smp_boot_cpus (the OF is trashed by then) 1431 * so we have to put the processors into a holding pattern controlled 1432 * by the kernel (not OF) before we destroy the OF. 1433 * 1434 * This uses a chunk of low memory, puts some holding pattern 1435 * code there and sends the other processors off to there until 1436 * smp_boot_cpus tells them to do something. The holding pattern 1437 * checks that address until its cpu # is there, when it is that 1438 * cpu jumps to __secondary_start(). smp_boot_cpus() takes care 1439 * of setting those values. 1440 * 1441 * We also use physical address 0x4 here to tell when a cpu 1442 * is in its holding pattern code. 1443 * 1444 * -- Cort 1445 */ 1446/* 1447 * We want to reference the copy of __secondary_hold_* in the 1448 * 0 - 0x100 address range 1449 */ 1450#define LOW_ADDR(x) (((unsigned long) &(x)) & 0xff) 1451 1452static void __init prom_hold_cpus(void) 1453{ 1454 unsigned long i; 1455 unsigned int reg; 1456 phandle node; 1457 char type[64]; 1458 struct prom_t *_prom = &RELOC(prom); 1459 unsigned long *spinloop 1460 = (void *) LOW_ADDR(__secondary_hold_spinloop); 1461 unsigned long *acknowledge 1462 = (void *) LOW_ADDR(__secondary_hold_acknowledge); 1463 unsigned long secondary_hold = LOW_ADDR(__secondary_hold); 1464 1465 prom_debug("prom_hold_cpus: start...\n"); 1466 prom_debug(" 1) spinloop = 0x%x\n", (unsigned long)spinloop); 1467 prom_debug(" 1) *spinloop = 0x%x\n", *spinloop); 1468 prom_debug(" 1) acknowledge = 0x%x\n", 1469 (unsigned long)acknowledge); 1470 prom_debug(" 1) *acknowledge = 0x%x\n", *acknowledge); 1471 prom_debug(" 1) secondary_hold = 0x%x\n", secondary_hold); 1472 1473 /* Set the common spinloop variable, so all of the secondary cpus 1474 * will block when they are awakened from their OF spinloop. 1475 * This must occur for both SMP and non SMP kernels, since OF will 1476 * be trashed when we move the kernel. 1477 */ 1478 *spinloop = 0; 1479 1480 /* look for cpus */ 1481 for (node = 0; prom_next_node(&node); ) { 1482 type[0] = 0; 1483 prom_getprop(node, "device_type", type, sizeof(type)); 1484 if (strcmp(type, RELOC("cpu")) != 0) 1485 continue; 1486 1487 /* Skip non-configured cpus. */ 1488 if (prom_getprop(node, "status", type, sizeof(type)) > 0) 1489 if (strcmp(type, RELOC("okay")) != 0) 1490 continue; 1491 1492 reg = -1; 1493 prom_getprop(node, "reg", ®, sizeof(reg)); 1494 1495 prom_debug("cpu hw idx = %lu\n", reg); 1496 1497 /* Init the acknowledge var which will be reset by 1498 * the secondary cpu when it awakens from its OF 1499 * spinloop. 1500 */ 1501 *acknowledge = (unsigned long)-1; 1502 1503 if (reg != _prom->cpu) { 1504 /* Primary Thread of non-boot cpu */ 1505 prom_printf("starting cpu hw idx %lu... ", reg); 1506 call_prom("start-cpu", 3, 0, node, 1507 secondary_hold, reg); 1508 1509 for (i = 0; (i < 100000000) && 1510 (*acknowledge == ((unsigned long)-1)); i++ ) 1511 mb(); 1512 1513 if (*acknowledge == reg) 1514 prom_printf("done\n"); 1515 else 1516 prom_printf("failed: %x\n", *acknowledge); 1517 } 1518#ifdef CONFIG_SMP 1519 else 1520 prom_printf("boot cpu hw idx %lu\n", reg); 1521#endif /* CONFIG_SMP */ 1522 } 1523 1524 prom_debug("prom_hold_cpus: end...\n"); 1525} 1526 1527 1528static void __init prom_init_client_services(unsigned long pp) 1529{ 1530 struct prom_t *_prom = &RELOC(prom); 1531 1532 /* Get a handle to the prom entry point before anything else */ 1533 RELOC(prom_entry) = pp; 1534 1535 /* get a handle for the stdout device */ 1536 _prom->chosen = call_prom("finddevice", 1, 1, ADDR("/chosen")); 1537 if (!PHANDLE_VALID(_prom->chosen)) 1538 prom_panic("cannot find chosen"); /* msg won't be printed :( */ 1539 1540 /* get device tree root */ 1541 _prom->root = call_prom("finddevice", 1, 1, ADDR("/")); 1542 if (!PHANDLE_VALID(_prom->root)) 1543 prom_panic("cannot find device tree root"); /* msg won't be printed :( */ 1544 1545 _prom->mmumap = 0; 1546} 1547 1548#ifdef CONFIG_PPC32 1549static void __init prom_find_mmu(void) 1550{ 1551 struct prom_t *_prom = &RELOC(prom); 1552 phandle oprom; 1553 char version[64]; 1554 1555 oprom = call_prom("finddevice", 1, 1, ADDR("/openprom")); 1556 if (!PHANDLE_VALID(oprom)) 1557 return; 1558 if (prom_getprop(oprom, "model", version, sizeof(version)) <= 0) 1559 return; 1560 version[sizeof(version) - 1] = 0; 1561 if (strcmp(version, "Open Firmware, 1.0.5") == 0) 1562 of_workarounds = OF_WA_CLAIM; 1563 else if (strncmp(version, "FirmWorks,3.", 12) == 0) { 1564 of_workarounds = OF_WA_CLAIM | OF_WA_LONGTRAIL; 1565 call_prom("interpret", 1, 1, "dev /memory 0 to allow-reclaim"); 1566 } else 1567 return; 1568 _prom->memory = call_prom("open", 1, 1, ADDR("/memory")); 1569 prom_getprop(_prom->chosen, "mmu", &_prom->mmumap, 1570 sizeof(_prom->mmumap)); 1571 if (!IHANDLE_VALID(_prom->memory) || !IHANDLE_VALID(_prom->mmumap)) 1572 of_workarounds &= ~OF_WA_CLAIM; /* hmmm */ 1573} 1574#else 1575#define prom_find_mmu() 1576#endif 1577 1578static void __init prom_init_stdout(void) 1579{ 1580 struct prom_t *_prom = &RELOC(prom); 1581 char *path = RELOC(of_stdout_device); 1582 char type[16]; 1583 u32 val; 1584 1585 if (prom_getprop(_prom->chosen, "stdout", &val, sizeof(val)) <= 0) 1586 prom_panic("cannot find stdout"); 1587 1588 _prom->stdout = val; 1589 1590 /* Get the full OF pathname of the stdout device */ 1591 memset(path, 0, 256); 1592 call_prom("instance-to-path", 3, 1, _prom->stdout, path, 255); 1593 val = call_prom("instance-to-package", 1, 1, _prom->stdout); 1594 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-package", 1595 &val, sizeof(val)); 1596 prom_printf("OF stdout device is: %s\n", RELOC(of_stdout_device)); 1597 prom_setprop(_prom->chosen, "/chosen", "linux,stdout-path", 1598 path, strlen(path) + 1); 1599 1600 /* If it's a display, note it */ 1601 memset(type, 0, sizeof(type)); 1602 prom_getprop(val, "device_type", type, sizeof(type)); 1603 if (strcmp(type, RELOC("display")) == 0) 1604 prom_setprop(val, path, "linux,boot-display", NULL, 0); 1605} 1606 1607static void __init prom_close_stdin(void) 1608{ 1609 struct prom_t *_prom = &RELOC(prom); 1610 ihandle val; 1611 1612 if (prom_getprop(_prom->chosen, "stdin", &val, sizeof(val)) > 0) 1613 call_prom("close", 1, 0, val); 1614} 1615 1616static int __init prom_find_machine_type(void) 1617{ 1618 struct prom_t *_prom = &RELOC(prom); 1619 char compat[256]; 1620 int len, i = 0; 1621#ifdef CONFIG_PPC64 1622 phandle rtas; 1623 int x; 1624#endif 1625 1626 /* Look for a PowerMac */ 1627 len = prom_getprop(_prom->root, "compatible", 1628 compat, sizeof(compat)-1); 1629 if (len > 0) { 1630 compat[len] = 0; 1631 while (i < len) { 1632 char *p = &compat[i]; 1633 int sl = strlen(p); 1634 if (sl == 0) 1635 break; 1636 if (strstr(p, RELOC("Power Macintosh")) || 1637 strstr(p, RELOC("MacRISC"))) 1638 return PLATFORM_POWERMAC; 1639#ifdef CONFIG_PPC64 1640 /* We must make sure we don't detect the IBM Cell 1641 * blades as pSeries due to some firmware issues, 1642 * so we do it here. 1643 */ 1644 if (strstr(p, RELOC("IBM,CBEA")) || 1645 strstr(p, RELOC("IBM,CPBW-1.0"))) 1646 return PLATFORM_GENERIC; 1647#endif /* CONFIG_PPC64 */ 1648 i += sl + 1; 1649 } 1650 } 1651#ifdef CONFIG_PPC64 1652 /* If not a mac, try to figure out if it's an IBM pSeries or any other 1653 * PAPR compliant platform. We assume it is if : 1654 * - /device_type is "chrp" (please, do NOT use that for future 1655 * non-IBM designs ! 1656 * - it has /rtas 1657 */ 1658 len = prom_getprop(_prom->root, "device_type", 1659 compat, sizeof(compat)-1); 1660 if (len <= 0) 1661 return PLATFORM_GENERIC; 1662 if (strcmp(compat, RELOC("chrp"))) 1663 return PLATFORM_GENERIC; 1664 1665 /* Default to pSeries. We need to know if we are running LPAR */ 1666 rtas = call_prom("finddevice", 1, 1, ADDR("/rtas")); 1667 if (!PHANDLE_VALID(rtas)) 1668 return PLATFORM_GENERIC; 1669 x = prom_getproplen(rtas, "ibm,hypertas-functions"); 1670 if (x != PROM_ERROR) { 1671 prom_debug("Hypertas detected, assuming LPAR !\n"); 1672 return PLATFORM_PSERIES_LPAR; 1673 } 1674 return PLATFORM_PSERIES; 1675#else 1676 return PLATFORM_GENERIC; 1677#endif 1678} 1679 1680static int __init prom_set_color(ihandle ih, int i, int r, int g, int b) 1681{ 1682 return call_prom("call-method", 6, 1, ADDR("color!"), ih, i, b, g, r); 1683} 1684 1685/* 1686 * If we have a display that we don't know how to drive, 1687 * we will want to try to execute OF's open method for it 1688 * later. However, OF will probably fall over if we do that 1689 * we've taken over the MMU. 1690 * So we check whether we will need to open the display, 1691 * and if so, open it now. 1692 */ 1693static void __init prom_check_displays(void) 1694{ 1695 char type[16], *path; 1696 phandle node; 1697 ihandle ih; 1698 int i; 1699 1700 static unsigned char default_colors[] = { 1701 0x00, 0x00, 0x00, 1702 0x00, 0x00, 0xaa, 1703 0x00, 0xaa, 0x00, 1704 0x00, 0xaa, 0xaa, 1705 0xaa, 0x00, 0x00, 1706 0xaa, 0x00, 0xaa, 1707 0xaa, 0xaa, 0x00, 1708 0xaa, 0xaa, 0xaa, 1709 0x55, 0x55, 0x55, 1710 0x55, 0x55, 0xff, 1711 0x55, 0xff, 0x55, 1712 0x55, 0xff, 0xff, 1713 0xff, 0x55, 0x55, 1714 0xff, 0x55, 0xff, 1715 0xff, 0xff, 0x55, 1716 0xff, 0xff, 0xff 1717 }; 1718 const unsigned char *clut; 1719 1720 prom_debug("Looking for displays\n"); 1721 for (node = 0; prom_next_node(&node); ) { 1722 memset(type, 0, sizeof(type)); 1723 prom_getprop(node, "device_type", type, sizeof(type)); 1724 if (strcmp(type, RELOC("display")) != 0) 1725 continue; 1726 1727 /* It seems OF doesn't null-terminate the path :-( */ 1728 path = RELOC(prom_scratch); 1729 memset(path, 0, PROM_SCRATCH_SIZE); 1730 1731 /* 1732 * leave some room at the end of the path for appending extra 1733 * arguments 1734 */ 1735 if (call_prom("package-to-path", 3, 1, node, path, 1736 PROM_SCRATCH_SIZE-10) == PROM_ERROR) 1737 continue; 1738 prom_printf("found display : %s, opening... ", path); 1739 1740 ih = call_prom("open", 1, 1, path); 1741 if (ih == 0) { 1742 prom_printf("failed\n"); 1743 continue; 1744 } 1745 1746 /* Success */ 1747 prom_printf("done\n"); 1748 prom_setprop(node, path, "linux,opened", NULL, 0); 1749 1750 /* Setup a usable color table when the appropriate 1751 * method is available. Should update this to set-colors */ 1752 clut = RELOC(default_colors); 1753 for (i = 0; i < 32; i++, clut += 3) 1754 if (prom_set_color(ih, i, clut[0], clut[1], 1755 clut[2]) != 0) 1756 break; 1757 1758#ifdef CONFIG_LOGO_LINUX_CLUT224 1759 clut = PTRRELOC(RELOC(logo_linux_clut224.clut)); 1760 for (i = 0; i < RELOC(logo_linux_clut224.clutsize); i++, clut += 3) 1761 if (prom_set_color(ih, i + 32, clut[0], clut[1], 1762 clut[2]) != 0) 1763 break; 1764#endif /* CONFIG_LOGO_LINUX_CLUT224 */ 1765 } 1766} 1767 1768 1769/* Return (relocated) pointer to this much memory: moves initrd if reqd. */ 1770static void __init *make_room(unsigned long *mem_start, unsigned long *mem_end, 1771 unsigned long needed, unsigned long align) 1772{ 1773 void *ret; 1774 1775 *mem_start = _ALIGN(*mem_start, align); 1776 while ((*mem_start + needed) > *mem_end) { 1777 unsigned long room, chunk; 1778 1779 prom_debug("Chunk exhausted, claiming more at %x...\n", 1780 RELOC(alloc_bottom)); 1781 room = RELOC(alloc_top) - RELOC(alloc_bottom); 1782 if (room > DEVTREE_CHUNK_SIZE) 1783 room = DEVTREE_CHUNK_SIZE; 1784 if (room < PAGE_SIZE) 1785 prom_panic("No memory for flatten_device_tree (no room)"); 1786 chunk = alloc_up(room, 0); 1787 if (chunk == 0) 1788 prom_panic("No memory for flatten_device_tree (claim failed)"); 1789 *mem_end = RELOC(alloc_top); 1790 } 1791 1792 ret = (void *)*mem_start; 1793 *mem_start += needed; 1794 1795 return ret; 1796} 1797 1798#define dt_push_token(token, mem_start, mem_end) \ 1799 do { *((u32 *)make_room(mem_start, mem_end, 4, 4)) = token; } while(0) 1800 1801static unsigned long __init dt_find_string(char *str) 1802{ 1803 char *s, *os; 1804 1805 s = os = (char *)RELOC(dt_string_start); 1806 s += 4; 1807 while (s < (char *)RELOC(dt_string_end)) { 1808 if (strcmp(s, str) == 0) 1809 return s - os; 1810 s += strlen(s) + 1; 1811 } 1812 return 0; 1813} 1814 1815/* 1816 * The Open Firmware 1275 specification states properties must be 31 bytes or 1817 * less, however not all firmwares obey this. Make it 64 bytes to be safe. 1818 */ 1819#define MAX_PROPERTY_NAME 64 1820 1821static void __init scan_dt_build_strings(phandle node, 1822 unsigned long *mem_start, 1823 unsigned long *mem_end) 1824{ 1825 char *prev_name, *namep, *sstart; 1826 unsigned long soff; 1827 phandle child; 1828 1829 sstart = (char *)RELOC(dt_string_start); 1830 1831 /* get and store all property names */ 1832 prev_name = RELOC(""); 1833 for (;;) { 1834 /* 64 is max len of name including nul. */ 1835 namep = make_room(mem_start, mem_end, MAX_PROPERTY_NAME, 1); 1836 if (call_prom("nextprop", 3, 1, node, prev_name, namep) != 1) { 1837 /* No more nodes: unwind alloc */ 1838 *mem_start = (unsigned long)namep; 1839 break; 1840 } 1841 1842 /* skip "name" */ 1843 if (strcmp(namep, RELOC("name")) == 0) { 1844 *mem_start = (unsigned long)namep; 1845 prev_name = RELOC("name"); 1846 continue; 1847 } 1848 /* get/create string entry */ 1849 soff = dt_find_string(namep); 1850 if (soff != 0) { 1851 *mem_start = (unsigned long)namep; 1852 namep = sstart + soff; 1853 } else { 1854 /* Trim off some if we can */ 1855 *mem_start = (unsigned long)namep + strlen(namep) + 1; 1856 RELOC(dt_string_end) = *mem_start; 1857 } 1858 prev_name = namep; 1859 } 1860 1861 /* do all our children */ 1862 child = call_prom("child", 1, 1, node); 1863 while (child != 0) { 1864 scan_dt_build_strings(child, mem_start, mem_end); 1865 child = call_prom("peer", 1, 1, child); 1866 } 1867} 1868 1869static void __init scan_dt_build_struct(phandle node, unsigned long *mem_start, 1870 unsigned long *mem_end) 1871{ 1872 phandle child; 1873 char *namep, *prev_name, *sstart, *p, *ep, *lp, *path; 1874 unsigned long soff; 1875 unsigned char *valp; 1876 static char pname[MAX_PROPERTY_NAME]; 1877 int l, room; 1878 1879 dt_push_token(OF_DT_BEGIN_NODE, mem_start, mem_end); 1880 1881 /* get the node's full name */ 1882 namep = (char *)*mem_start; 1883 room = *mem_end - *mem_start; 1884 if (room > 255) 1885 room = 255; 1886 l = call_prom("package-to-path", 3, 1, node, namep, room); 1887 if (l >= 0) { 1888 /* Didn't fit? Get more room. */ 1889 if (l >= room) { 1890 if (l >= *mem_end - *mem_start) 1891 namep = make_room(mem_start, mem_end, l+1, 1); 1892 call_prom("package-to-path", 3, 1, node, namep, l); 1893 } 1894 namep[l] = '\0'; 1895 1896 /* Fixup an Apple bug where they have bogus \0 chars in the 1897 * middle of the path in some properties, and extract 1898 * the unit name (everything after the last '/'). 1899 */ 1900 for (lp = p = namep, ep = namep + l; p < ep; p++) { 1901 if (*p == '/') 1902 lp = namep; 1903 else if (*p != 0) 1904 *lp++ = *p; 1905 } 1906 *lp = 0; 1907 *mem_start = _ALIGN((unsigned long)lp + 1, 4); 1908 } 1909 1910 /* get it again for debugging */ 1911 path = RELOC(prom_scratch); 1912 memset(path, 0, PROM_SCRATCH_SIZE); 1913 call_prom("package-to-path", 3, 1, node, path, PROM_SCRATCH_SIZE-1); 1914 1915 /* get and store all properties */ 1916 prev_name = RELOC(""); 1917 sstart = (char *)RELOC(dt_string_start); 1918 for (;;) { 1919 if (call_prom("nextprop", 3, 1, node, prev_name, 1920 RELOC(pname)) != 1) 1921 break; 1922 1923 /* skip "name" */ 1924 if (strcmp(RELOC(pname), RELOC("name")) == 0) { 1925 prev_name = RELOC("name"); 1926 continue; 1927 } 1928 1929 /* find string offset */ 1930 soff = dt_find_string(RELOC(pname)); 1931 if (soff == 0) { 1932 prom_printf("WARNING: Can't find string index for" 1933 " <%s>, node %s\n", RELOC(pname), path); 1934 break; 1935 } 1936 prev_name = sstart + soff; 1937 1938 /* get length */ 1939 l = call_prom("getproplen", 2, 1, node, RELOC(pname)); 1940 1941 /* sanity checks */ 1942 if (l == PROM_ERROR) 1943 continue; 1944 if (l > MAX_PROPERTY_LENGTH) { 1945 prom_printf("WARNING: ignoring large property "); 1946 /* It seems OF doesn't null-terminate the path :-( */ 1947 prom_printf("[%s] ", path); 1948 prom_printf("%s length 0x%x\n", RELOC(pname), l); 1949 continue; 1950 } 1951 1952 /* push property head */ 1953 dt_push_token(OF_DT_PROP, mem_start, mem_end); 1954 dt_push_token(l, mem_start, mem_end); 1955 dt_push_token(soff, mem_start, mem_end); 1956 1957 /* push property content */ 1958 valp = make_room(mem_start, mem_end, l, 4); 1959 call_prom("getprop", 4, 1, node, RELOC(pname), valp, l); 1960 *mem_start = _ALIGN(*mem_start, 4); 1961 } 1962 1963 /* Add a "linux,phandle" property. */ 1964 soff = dt_find_string(RELOC("linux,phandle")); 1965 if (soff == 0) 1966 prom_printf("WARNING: Can't find string index for" 1967 " <linux-phandle> node %s\n", path); 1968 else { 1969 dt_push_token(OF_DT_PROP, mem_start, mem_end); 1970 dt_push_token(4, mem_start, mem_end); 1971 dt_push_token(soff, mem_start, mem_end); 1972 valp = make_room(mem_start, mem_end, 4, 4); 1973 *(u32 *)valp = node; 1974 } 1975 1976 /* do all our children */ 1977 child = call_prom("child", 1, 1, node); 1978 while (child != 0) { 1979 scan_dt_build_struct(child, mem_start, mem_end); 1980 child = call_prom("peer", 1, 1, child); 1981 } 1982 1983 dt_push_token(OF_DT_END_NODE, mem_start, mem_end); 1984} 1985 1986static void __init flatten_device_tree(void) 1987{ 1988 phandle root; 1989 unsigned long mem_start, mem_end, room; 1990 struct boot_param_header *hdr; 1991 struct prom_t *_prom = &RELOC(prom); 1992 char *namep; 1993 u64 *rsvmap; 1994 1995 /* 1996 * Check how much room we have between alloc top & bottom (+/- a 1997 * few pages), crop to 4Mb, as this is our "chuck" size 1998 */ 1999 room = RELOC(alloc_top) - RELOC(alloc_bottom) - 0x4000; 2000 if (room > DEVTREE_CHUNK_SIZE) 2001 room = DEVTREE_CHUNK_SIZE; 2002 prom_debug("starting device tree allocs at %x\n", RELOC(alloc_bottom)); 2003 2004 /* Now try to claim that */ 2005 mem_start = (unsigned long)alloc_up(room, PAGE_SIZE); 2006 if (mem_start == 0) 2007 prom_panic("Can't allocate initial device-tree chunk\n"); 2008 mem_end = RELOC(alloc_top); 2009 2010 /* Get root of tree */ 2011 root = call_prom("peer", 1, 1, (phandle)0); 2012 if (root == (phandle)0) 2013 prom_panic ("couldn't get device tree root\n"); 2014 2015 /* Build header and make room for mem rsv map */ 2016 mem_start = _ALIGN(mem_start, 4); 2017 hdr = make_room(&mem_start, &mem_end, 2018 sizeof(struct boot_param_header), 4); 2019 RELOC(dt_header_start) = (unsigned long)hdr; 2020 rsvmap = make_room(&mem_start, &mem_end, sizeof(mem_reserve_map), 8); 2021 2022 /* Start of strings */ 2023 mem_start = PAGE_ALIGN(mem_start); 2024 RELOC(dt_string_start) = mem_start; 2025 mem_start += 4; /* hole */ 2026 2027 /* Add "linux,phandle" in there, we'll need it */ 2028 namep = make_room(&mem_start, &mem_end, 16, 1); 2029 strcpy(namep, RELOC("linux,phandle")); 2030 mem_start = (unsigned long)namep + strlen(namep) + 1; 2031 2032 /* Build string array */ 2033 prom_printf("Building dt strings...\n"); 2034 scan_dt_build_strings(root, &mem_start, &mem_end); 2035 RELOC(dt_string_end) = mem_start; 2036 2037 /* Build structure */ 2038 mem_start = PAGE_ALIGN(mem_start); 2039 RELOC(dt_struct_start) = mem_start; 2040 prom_printf("Building dt structure...\n"); 2041 scan_dt_build_struct(root, &mem_start, &mem_end); 2042 dt_push_token(OF_DT_END, &mem_start, &mem_end); 2043 RELOC(dt_struct_end) = PAGE_ALIGN(mem_start); 2044 2045 /* Finish header */ 2046 hdr->boot_cpuid_phys = _prom->cpu; 2047 hdr->magic = OF_DT_HEADER; 2048 hdr->totalsize = RELOC(dt_struct_end) - RELOC(dt_header_start); 2049 hdr->off_dt_struct = RELOC(dt_struct_start) - RELOC(dt_header_start); 2050 hdr->off_dt_strings = RELOC(dt_string_start) - RELOC(dt_header_start); 2051 hdr->dt_strings_size = RELOC(dt_string_end) - RELOC(dt_string_start); 2052 hdr->off_mem_rsvmap = ((unsigned long)rsvmap) - RELOC(dt_header_start); 2053 hdr->version = OF_DT_VERSION; 2054 /* Version 16 is not backward compatible */ 2055 hdr->last_comp_version = 0x10; 2056 2057 /* Copy the reserve map in */ 2058 memcpy(rsvmap, RELOC(mem_reserve_map), sizeof(mem_reserve_map)); 2059 2060#ifdef DEBUG_PROM 2061 { 2062 int i; 2063 prom_printf("reserved memory map:\n"); 2064 for (i = 0; i < RELOC(mem_reserve_cnt); i++) 2065 prom_printf(" %x - %x\n", 2066 RELOC(mem_reserve_map)[i].base, 2067 RELOC(mem_reserve_map)[i].size); 2068 } 2069#endif 2070 /* Bump mem_reserve_cnt to cause further reservations to fail 2071 * since it's too late. 2072 */ 2073 RELOC(mem_reserve_cnt) = MEM_RESERVE_MAP_SIZE; 2074 2075 prom_printf("Device tree strings 0x%x -> 0x%x\n", 2076 RELOC(dt_string_start), RELOC(dt_string_end)); 2077 prom_printf("Device tree struct 0x%x -> 0x%x\n", 2078 RELOC(dt_struct_start), RELOC(dt_struct_end)); 2079 2080} 2081 2082#ifdef CONFIG_PPC_MAPLE 2083/* PIBS Version 1.05.0000 04/26/2005 has an incorrect /ht/isa/ranges property. 2084 * The values are bad, and it doesn't even have the right number of cells. */ 2085static void __init fixup_device_tree_maple(void) 2086{ 2087 phandle isa; 2088 u32 rloc = 0x01002000; /* IO space; PCI device = 4 */ 2089 u32 isa_ranges[6]; 2090 char *name; 2091 2092 name = "/ht@0/isa@4"; 2093 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2094 if (!PHANDLE_VALID(isa)) { 2095 name = "/ht@0/isa@6"; 2096 isa = call_prom("finddevice", 1, 1, ADDR(name)); 2097 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2098 } 2099 if (!PHANDLE_VALID(isa)) 2100 return; 2101 2102 if (prom_getproplen(isa, "ranges") != 12) 2103 return; 2104 if (prom_getprop(isa, "ranges", isa_ranges, sizeof(isa_ranges)) 2105 == PROM_ERROR) 2106 return; 2107 2108 if (isa_ranges[0] != 0x1 || 2109 isa_ranges[1] != 0xf4000000 || 2110 isa_ranges[2] != 0x00010000) 2111 return; 2112 2113 prom_printf("Fixing up bogus ISA range on Maple/Apache...\n"); 2114 2115 isa_ranges[0] = 0x1; 2116 isa_ranges[1] = 0x0; 2117 isa_ranges[2] = rloc; 2118 isa_ranges[3] = 0x0; 2119 isa_ranges[4] = 0x0; 2120 isa_ranges[5] = 0x00010000; 2121 prom_setprop(isa, name, "ranges", 2122 isa_ranges, sizeof(isa_ranges)); 2123} 2124 2125#define CPC925_MC_START 0xf8000000 2126#define CPC925_MC_LENGTH 0x1000000 2127/* The values for memory-controller don't have right number of cells */ 2128static void __init fixup_device_tree_maple_memory_controller(void) 2129{ 2130 phandle mc; 2131 u32 mc_reg[4]; 2132 char *name = "/hostbridge@f8000000"; 2133 struct prom_t *_prom = &RELOC(prom); 2134 u32 ac, sc; 2135 2136 mc = call_prom("finddevice", 1, 1, ADDR(name)); 2137 if (!PHANDLE_VALID(mc)) 2138 return; 2139 2140 if (prom_getproplen(mc, "reg") != 8) 2141 return; 2142 2143 prom_getprop(_prom->root, "#address-cells", &ac, sizeof(ac)); 2144 prom_getprop(_prom->root, "#size-cells", &sc, sizeof(sc)); 2145 if ((ac != 2) || (sc != 2)) 2146 return; 2147 2148 if (prom_getprop(mc, "reg", mc_reg, sizeof(mc_reg)) == PROM_ERROR) 2149 return; 2150 2151 if (mc_reg[0] != CPC925_MC_START || mc_reg[1] != CPC925_MC_LENGTH) 2152 return; 2153 2154 prom_printf("Fixing up bogus hostbridge on Maple...\n"); 2155 2156 mc_reg[0] = 0x0; 2157 mc_reg[1] = CPC925_MC_START; 2158 mc_reg[2] = 0x0; 2159 mc_reg[3] = CPC925_MC_LENGTH; 2160 prom_setprop(mc, name, "reg", mc_reg, sizeof(mc_reg)); 2161} 2162#else 2163#define fixup_device_tree_maple() 2164#define fixup_device_tree_maple_memory_controller() 2165#endif 2166 2167#ifdef CONFIG_PPC_CHRP 2168/* 2169 * Pegasos and BriQ lacks the "ranges" property in the isa node 2170 * Pegasos needs decimal IRQ 14/15, not hexadecimal 2171 * Pegasos has the IDE configured in legacy mode, but advertised as native 2172 */ 2173static void __init fixup_device_tree_chrp(void) 2174{ 2175 phandle ph; 2176 u32 prop[6]; 2177 u32 rloc = 0x01006000; /* IO space; PCI device = 12 */ 2178 char *name; 2179 int rc; 2180 2181 name = "/pci@80000000/isa@c"; 2182 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2183 if (!PHANDLE_VALID(ph)) { 2184 name = "/pci@ff500000/isa@6"; 2185 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2186 rloc = 0x01003000; /* IO space; PCI device = 6 */ 2187 } 2188 if (PHANDLE_VALID(ph)) { 2189 rc = prom_getproplen(ph, "ranges"); 2190 if (rc == 0 || rc == PROM_ERROR) { 2191 prom_printf("Fixing up missing ISA range on Pegasos...\n"); 2192 2193 prop[0] = 0x1; 2194 prop[1] = 0x0; 2195 prop[2] = rloc; 2196 prop[3] = 0x0; 2197 prop[4] = 0x0; 2198 prop[5] = 0x00010000; 2199 prom_setprop(ph, name, "ranges", prop, sizeof(prop)); 2200 } 2201 } 2202 2203 name = "/pci@80000000/ide@C,1"; 2204 ph = call_prom("finddevice", 1, 1, ADDR(name)); 2205 if (PHANDLE_VALID(ph)) { 2206 prom_printf("Fixing up IDE interrupt on Pegasos...\n"); 2207 prop[0] = 14; 2208 prop[1] = 0x0; 2209 prom_setprop(ph, name, "interrupts", prop, 2*sizeof(u32)); 2210 prom_printf("Fixing up IDE class-code on Pegasos...\n"); 2211 rc = prom_getprop(ph, "class-code", prop, sizeof(u32)); 2212 if (rc == sizeof(u32)) { 2213 prop[0] &= ~0x5; 2214 prom_setprop(ph, name, "class-code", prop, sizeof(u32)); 2215 } 2216 } 2217} 2218#else 2219#define fixup_device_tree_chrp() 2220#endif 2221 2222#if defined(CONFIG_PPC64) && defined(CONFIG_PPC_PMAC) 2223static void __init fixup_device_tree_pmac(void) 2224{ 2225 phandle u3, i2c, mpic; 2226 u32 u3_rev; 2227 u32 interrupts[2]; 2228 u32 parent; 2229 2230 /* Some G5s have a missing interrupt definition, fix it up here */ 2231 u3 = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000")); 2232 if (!PHANDLE_VALID(u3)) 2233 return; 2234 i2c = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/i2c@f8001000")); 2235 if (!PHANDLE_VALID(i2c)) 2236 return; 2237 mpic = call_prom("finddevice", 1, 1, ADDR("/u3@0,f8000000/mpic@f8040000")); 2238 if (!PHANDLE_VALID(mpic)) 2239 return; 2240 2241 /* check if proper rev of u3 */ 2242 if (prom_getprop(u3, "device-rev", &u3_rev, sizeof(u3_rev)) 2243 == PROM_ERROR) 2244 return; 2245 if (u3_rev < 0x35 || u3_rev > 0x39) 2246 return; 2247 /* does it need fixup ? */ 2248 if (prom_getproplen(i2c, "interrupts") > 0) 2249 return; 2250 2251 prom_printf("fixing up bogus interrupts for u3 i2c...\n"); 2252 2253 /* interrupt on this revision of u3 is number 0 and level */ 2254 interrupts[0] = 0; 2255 interrupts[1] = 1; 2256 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupts", 2257 &interrupts, sizeof(interrupts)); 2258 parent = (u32)mpic; 2259 prom_setprop(i2c, "/u3@0,f8000000/i2c@f8001000", "interrupt-parent", 2260 &parent, sizeof(parent)); 2261} 2262#else 2263#define fixup_device_tree_pmac() 2264#endif 2265 2266#ifdef CONFIG_PPC_EFIKA 2267/* 2268 * The MPC5200 FEC driver requires an phy-handle property to tell it how 2269 * to talk to the phy. If the phy-handle property is missing, then this 2270 * function is called to add the appropriate nodes and link it to the 2271 * ethernet node. 2272 */ 2273static void __init fixup_device_tree_efika_add_phy(void) 2274{ 2275 u32 node; 2276 char prop[64]; 2277 int rv; 2278 2279 /* Check if /builtin/ethernet exists - bail if it doesn't */ 2280 node = call_prom("finddevice", 1, 1, ADDR("/builtin/ethernet")); 2281 if (!PHANDLE_VALID(node)) 2282 return; 2283 2284 /* Check if the phy-handle property exists - bail if it does */ 2285 rv = prom_getprop(node, "phy-handle", prop, sizeof(prop)); 2286 if (!rv) 2287 return; 2288 2289 /* 2290 * At this point the ethernet device doesn't have a phy described. 2291 * Now we need to add the missing phy node and linkage 2292 */ 2293 2294 /* Check for an MDIO bus node - if missing then create one */ 2295 node = call_prom("finddevice", 1, 1, ADDR("/builtin/mdio")); 2296 if (!PHANDLE_VALID(node)) { 2297 prom_printf("Adding Ethernet MDIO node\n"); 2298 call_prom("interpret", 1, 1, 2299 " s\" /builtin\" find-device" 2300 " new-device" 2301 " 1 encode-int s\" #address-cells\" property" 2302 " 0 encode-int s\" #size-cells\" property" 2303 " s\" mdio\" device-name" 2304 " s\" fsl,mpc5200b-mdio\" encode-string" 2305 " s\" compatible\" property" 2306 " 0xf0003000 0x400 reg" 2307 " 0x2 encode-int" 2308 " 0x5 encode-int encode+" 2309 " 0x3 encode-int encode+" 2310 " s\" interrupts\" property" 2311 " finish-device"); 2312 }; 2313 2314 /* Check for a PHY device node - if missing then create one and 2315 * give it's phandle to the ethernet node */ 2316 node = call_prom("finddevice", 1, 1, 2317 ADDR("/builtin/mdio/ethernet-phy")); 2318 if (!PHANDLE_VALID(node)) { 2319 prom_printf("Adding Ethernet PHY node\n"); 2320 call_prom("interpret", 1, 1, 2321 " s\" /builtin/mdio\" find-device" 2322 " new-device" 2323 " s\" ethernet-phy\" device-name" 2324 " 0x10 encode-int s\" reg\" property" 2325 " my-self" 2326 " ihandle>phandle" 2327 " finish-device" 2328 " s\" /builtin/ethernet\" find-device" 2329 " encode-int" 2330 " s\" phy-handle\" property" 2331 " device-end"); 2332 } 2333} 2334 2335static void __init fixup_device_tree_efika(void) 2336{ 2337 int sound_irq[3] = { 2, 2, 0 }; 2338 int bcomm_irq[3*16] = { 3,0,0, 3,1,0, 3,2,0, 3,3,0, 2339 3,4,0, 3,5,0, 3,6,0, 3,7,0, 2340 3,8,0, 3,9,0, 3,10,0, 3,11,0, 2341 3,12,0, 3,13,0, 3,14,0, 3,15,0 }; 2342 u32 node; 2343 char prop[64]; 2344 int rv, len; 2345 2346 /* Check if we're really running on a EFIKA */ 2347 node = call_prom("finddevice", 1, 1, ADDR("/")); 2348 if (!PHANDLE_VALID(node)) 2349 return; 2350 2351 rv = prom_getprop(node, "model", prop, sizeof(prop)); 2352 if (rv == PROM_ERROR) 2353 return; 2354 if (strcmp(prop, "EFIKA5K2")) 2355 return; 2356 2357 prom_printf("Applying EFIKA device tree fixups\n"); 2358 2359 /* Claiming to be 'chrp' is death */ 2360 node = call_prom("finddevice", 1, 1, ADDR("/")); 2361 rv = prom_getprop(node, "device_type", prop, sizeof(prop)); 2362 if (rv != PROM_ERROR && (strcmp(prop, "chrp") == 0)) 2363 prom_setprop(node, "/", "device_type", "efika", sizeof("efika")); 2364 2365 /* CODEGEN,description is exposed in /proc/cpuinfo so 2366 fix that too */ 2367 rv = prom_getprop(node, "CODEGEN,description", prop, sizeof(prop)); 2368 if (rv != PROM_ERROR && (strstr(prop, "CHRP"))) 2369 prom_setprop(node, "/", "CODEGEN,description", 2370 "Efika 5200B PowerPC System", 2371 sizeof("Efika 5200B PowerPC System")); 2372 2373 /* Fixup bestcomm interrupts property */ 2374 node = call_prom("finddevice", 1, 1, ADDR("/builtin/bestcomm")); 2375 if (PHANDLE_VALID(node)) { 2376 len = prom_getproplen(node, "interrupts"); 2377 if (len == 12) { 2378 prom_printf("Fixing bestcomm interrupts property\n"); 2379 prom_setprop(node, "/builtin/bestcom", "interrupts", 2380 bcomm_irq, sizeof(bcomm_irq)); 2381 } 2382 } 2383 2384 /* Fixup sound interrupts property */ 2385 node = call_prom("finddevice", 1, 1, ADDR("/builtin/sound")); 2386 if (PHANDLE_VALID(node)) { 2387 rv = prom_getprop(node, "interrupts", prop, sizeof(prop)); 2388 if (rv == PROM_ERROR) { 2389 prom_printf("Adding sound interrupts property\n"); 2390 prom_setprop(node, "/builtin/sound", "interrupts", 2391 sound_irq, sizeof(sound_irq)); 2392 } 2393 } 2394 2395 /* Make sure ethernet phy-handle property exists */ 2396 fixup_device_tree_efika_add_phy(); 2397} 2398#else 2399#define fixup_device_tree_efika() 2400#endif 2401 2402static void __init fixup_device_tree(void) 2403{ 2404 fixup_device_tree_maple(); 2405 fixup_device_tree_maple_memory_controller(); 2406 fixup_device_tree_chrp(); 2407 fixup_device_tree_pmac(); 2408 fixup_device_tree_efika(); 2409} 2410 2411static void __init prom_find_boot_cpu(void) 2412{ 2413 struct prom_t *_prom = &RELOC(prom); 2414 u32 getprop_rval; 2415 ihandle prom_cpu; 2416 phandle cpu_pkg; 2417 2418 _prom->cpu = 0; 2419 if (prom_getprop(_prom->chosen, "cpu", &prom_cpu, sizeof(prom_cpu)) <= 0) 2420 return; 2421 2422 cpu_pkg = call_prom("instance-to-package", 1, 1, prom_cpu); 2423 2424 prom_getprop(cpu_pkg, "reg", &getprop_rval, sizeof(getprop_rval)); 2425 _prom->cpu = getprop_rval; 2426 2427 prom_debug("Booting CPU hw index = %lu\n", _prom->cpu); 2428} 2429 2430static void __init prom_check_initrd(unsigned long r3, unsigned long r4) 2431{ 2432#ifdef CONFIG_BLK_DEV_INITRD 2433 struct prom_t *_prom = &RELOC(prom); 2434 2435 if (r3 && r4 && r4 != 0xdeadbeef) { 2436 unsigned long val; 2437 2438 RELOC(prom_initrd_start) = is_kernel_addr(r3) ? __pa(r3) : r3; 2439 RELOC(prom_initrd_end) = RELOC(prom_initrd_start) + r4; 2440 2441 val = RELOC(prom_initrd_start); 2442 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-start", 2443 &val, sizeof(val)); 2444 val = RELOC(prom_initrd_end); 2445 prom_setprop(_prom->chosen, "/chosen", "linux,initrd-end", 2446 &val, sizeof(val)); 2447 2448 reserve_mem(RELOC(prom_initrd_start), 2449 RELOC(prom_initrd_end) - RELOC(prom_initrd_start)); 2450 2451 prom_debug("initrd_start=0x%x\n", RELOC(prom_initrd_start)); 2452 prom_debug("initrd_end=0x%x\n", RELOC(prom_initrd_end)); 2453 } 2454#endif /* CONFIG_BLK_DEV_INITRD */ 2455} 2456 2457/* 2458 * We enter here early on, when the Open Firmware prom is still 2459 * handling exceptions and the MMU hash table for us. 2460 */ 2461 2462unsigned long __init prom_init(unsigned long r3, unsigned long r4, 2463 unsigned long pp, 2464 unsigned long r6, unsigned long r7, 2465 unsigned long kbase) 2466{ 2467 struct prom_t *_prom; 2468 unsigned long hdr; 2469 2470#ifdef CONFIG_PPC32 2471 unsigned long offset = reloc_offset(); 2472 reloc_got2(offset); 2473#endif 2474 2475 _prom = &RELOC(prom); 2476 2477 /* 2478 * First zero the BSS 2479 */ 2480 memset(&RELOC(__bss_start), 0, __bss_stop - __bss_start); 2481 2482 /* 2483 * Init interface to Open Firmware, get some node references, 2484 * like /chosen 2485 */ 2486 prom_init_client_services(pp); 2487 2488 /* 2489 * See if this OF is old enough that we need to do explicit maps 2490 * and other workarounds 2491 */ 2492 prom_find_mmu(); 2493 2494 /* 2495 * Init prom stdout device 2496 */ 2497 prom_init_stdout(); 2498 2499 prom_printf("Preparing to boot %s", RELOC(linux_banner)); 2500 2501 /* 2502 * Get default machine type. At this point, we do not differentiate 2503 * between pSeries SMP and pSeries LPAR 2504 */ 2505 RELOC(of_platform) = prom_find_machine_type(); 2506 2507#ifndef CONFIG_RELOCATABLE 2508 /* Bail if this is a kdump kernel. */ 2509 if (PHYSICAL_START > 0) 2510 prom_panic("Error: You can't boot a kdump kernel from OF!\n"); 2511#endif 2512 2513 /* 2514 * Check for an initrd 2515 */ 2516 prom_check_initrd(r3, r4); 2517 2518#ifdef CONFIG_PPC_PSERIES 2519 /* 2520 * On pSeries, inform the firmware about our capabilities 2521 */ 2522 if (RELOC(of_platform) == PLATFORM_PSERIES || 2523 RELOC(of_platform) == PLATFORM_PSERIES_LPAR) 2524 prom_send_capabilities(); 2525#endif 2526 2527 /* 2528 * Copy the CPU hold code 2529 */ 2530 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2531 copy_and_flush(0, kbase, 0x100, 0); 2532 2533 /* 2534 * Do early parsing of command line 2535 */ 2536 early_cmdline_parse(); 2537 2538 /* 2539 * Initialize memory management within prom_init 2540 */ 2541 prom_init_mem(); 2542 2543 /* 2544 * Determine which cpu is actually running right _now_ 2545 */ 2546 prom_find_boot_cpu(); 2547 2548 /* 2549 * Initialize display devices 2550 */ 2551 prom_check_displays(); 2552 2553#ifdef CONFIG_PPC64 2554 /* 2555 * Initialize IOMMU (TCE tables) on pSeries. Do that before anything else 2556 * that uses the allocator, we need to make sure we get the top of memory 2557 * available for us here... 2558 */ 2559 if (RELOC(of_platform) == PLATFORM_PSERIES) 2560 prom_initialize_tce_table(); 2561#endif 2562 2563 /* 2564 * On non-powermacs, try to instantiate RTAS and puts all CPUs 2565 * in spin-loops. PowerMacs don't have a working RTAS and use 2566 * a different way to spin CPUs 2567 */ 2568 if (RELOC(of_platform) != PLATFORM_POWERMAC) { 2569 prom_instantiate_rtas(); 2570 prom_hold_cpus(); 2571 } 2572 2573 /* 2574 * Fill in some infos for use by the kernel later on 2575 */ 2576 if (RELOC(prom_memory_limit)) 2577 prom_setprop(_prom->chosen, "/chosen", "linux,memory-limit", 2578 &RELOC(prom_memory_limit), 2579 sizeof(prom_memory_limit)); 2580#ifdef CONFIG_PPC64 2581 if (RELOC(prom_iommu_off)) 2582 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-off", 2583 NULL, 0); 2584 2585 if (RELOC(prom_iommu_force_on)) 2586 prom_setprop(_prom->chosen, "/chosen", "linux,iommu-force-on", 2587 NULL, 0); 2588 2589 if (RELOC(prom_tce_alloc_start)) { 2590 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-start", 2591 &RELOC(prom_tce_alloc_start), 2592 sizeof(prom_tce_alloc_start)); 2593 prom_setprop(_prom->chosen, "/chosen", "linux,tce-alloc-end", 2594 &RELOC(prom_tce_alloc_end), 2595 sizeof(prom_tce_alloc_end)); 2596 } 2597#endif 2598 2599 /* 2600 * Fixup any known bugs in the device-tree 2601 */ 2602 fixup_device_tree(); 2603 2604 /* 2605 * Now finally create the flattened device-tree 2606 */ 2607 prom_printf("copying OF device tree...\n"); 2608 flatten_device_tree(); 2609 2610 /* 2611 * in case stdin is USB and still active on IBM machines... 2612 * Unfortunately quiesce crashes on some powermacs if we have 2613 * closed stdin already (in particular the powerbook 101). 2614 */ 2615 if (RELOC(of_platform) != PLATFORM_POWERMAC) 2616 prom_close_stdin(); 2617 2618 /* 2619 * Call OF "quiesce" method to shut down pending DMA's from 2620 * devices etc... 2621 */ 2622 prom_printf("Calling quiesce...\n"); 2623 call_prom("quiesce", 0, 0); 2624 2625 /* 2626 * And finally, call the kernel passing it the flattened device 2627 * tree and NULL as r5, thus triggering the new entry point which 2628 * is common to us and kexec 2629 */ 2630 hdr = RELOC(dt_header_start); 2631 prom_printf("returning from prom_init\n"); 2632 prom_debug("->dt_header_start=0x%x\n", hdr); 2633 2634#ifdef CONFIG_PPC32 2635 reloc_got2(-offset); 2636#endif 2637 2638 __start(hdr, kbase, 0); 2639 2640 return 0; 2641} 2642