1/* 2 * linux/arch/arm26/kernel/setup.c 3 * 4 * Copyright (C) 1995-2001 Russell King 5 * Copyright (C) 2003 Ian Molton 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License version 2 as 9 * published by the Free Software Foundation. 10 */ 11#include <linux/kernel.h> 12#include <linux/stddef.h> 13#include <linux/ioport.h> 14#include <linux/delay.h> 15#include <linux/utsname.h> 16#include <linux/blkdev.h> 17#include <linux/console.h> 18#include <linux/bootmem.h> 19#include <linux/seq_file.h> 20#include <linux/screen_info.h> 21#include <linux/init.h> 22#include <linux/root_dev.h> 23 24#include <asm/elf.h> 25#include <asm/hardware.h> 26#include <asm/io.h> 27#include <asm/procinfo.h> 28#include <asm/setup.h> 29#include <asm/mach-types.h> 30#include <asm/tlbflush.h> 31 32#include <asm/irqchip.h> 33 34#ifndef MEM_SIZE 35#define MEM_SIZE (16*1024*1024) 36#endif 37 38#ifdef CONFIG_PREEMPT 39DEFINE_SPINLOCK(kernel_flag); 40#endif 41 42#if defined(CONFIG_FPE_NWFPE) 43char fpe_type[8]; 44 45static int __init fpe_setup(char *line) 46{ 47 memcpy(fpe_type, line, 8); 48 return 1; 49} 50 51__setup("fpe=", fpe_setup); 52#endif 53 54extern void paging_init(struct meminfo *); 55extern void convert_to_tag_list(struct tag *tags); 56extern void squash_mem_tags(struct tag *tag); 57extern void bootmem_init(struct meminfo *); 58extern int root_mountflags; 59extern int _stext, _text, _etext, _edata, _end; 60#ifdef CONFIG_XIP_KERNEL 61extern int _endtext, _sdata; 62#endif 63 64 65unsigned int processor_id; 66unsigned int __machine_arch_type; 67unsigned int system_rev; 68unsigned int system_serial_low; 69unsigned int system_serial_high; 70unsigned int elf_hwcap; 71unsigned int memc_ctrl_reg; 72unsigned int number_mfm_drives; 73 74struct processor processor; 75 76char elf_platform[ELF_PLATFORM_SIZE]; 77 78unsigned long phys_initrd_start __initdata = 0; 79unsigned long phys_initrd_size __initdata = 0; 80static struct meminfo meminfo __initdata = { 0, }; 81static struct proc_info_item proc_info; 82static const char *machine_name; 83static char __initdata command_line[COMMAND_LINE_SIZE]; 84 85static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; 86 87/* 88 * Standard memory resources 89 */ 90static struct resource mem_res[] = { 91 { "Video RAM", 0, 0, IORESOURCE_MEM }, 92 { "Kernel code", 0, 0, IORESOURCE_MEM }, 93 { "Kernel data", 0, 0, IORESOURCE_MEM } 94}; 95 96#define video_ram mem_res[0] 97#define kernel_code mem_res[1] 98#define kernel_data mem_res[2] 99 100static struct resource io_res[] = { 101 { "reserved", 0x3bc, 0x3be, IORESOURCE_IO | IORESOURCE_BUSY }, 102 { "reserved", 0x378, 0x37f, IORESOURCE_IO | IORESOURCE_BUSY }, 103 { "reserved", 0x278, 0x27f, IORESOURCE_IO | IORESOURCE_BUSY } 104}; 105 106#define lp0 io_res[0] 107#define lp1 io_res[1] 108#define lp2 io_res[2] 109 110#define dump_cpu_info() do { } while (0) 111 112static void __init setup_processor(void) 113{ 114 extern struct proc_info_list __proc_info_begin, __proc_info_end; 115 struct proc_info_list *list; 116 117 /* 118 * locate processor in the list of supported processor 119 * types. The linker builds this table for us from the 120 * entries in arch/arm26/mm/proc-*.S 121 */ 122 for (list = &__proc_info_begin; list < &__proc_info_end ; list++) 123 if ((processor_id & list->cpu_mask) == list->cpu_val) 124 break; 125 126 /* 127 * If processor type is unrecognised, then we 128 * can do nothing... 129 */ 130 if (list >= &__proc_info_end) { 131 printk("CPU configuration botched (ID %08x), unable " 132 "to continue.\n", processor_id); 133 while (1); 134 } 135 136 proc_info = *list->info; 137 processor = *list->proc; 138 139 140 printk("CPU: %s %s revision %d\n", 141 proc_info.manufacturer, proc_info.cpu_name, 142 (int)processor_id & 15); 143 144 dump_cpu_info(); 145 146 sprintf(init_utsname()->machine, "%s", list->arch_name); 147 sprintf(elf_platform, "%s", list->elf_name); 148 elf_hwcap = list->elf_hwcap; 149 150 cpu_proc_init(); 151} 152 153/* 154 * Initial parsing of the command line. We need to pick out the 155 * memory size. We look for mem=size@start, where start and size 156 * are "size[KkMm]" 157 */ 158static void __init 159parse_cmdline(struct meminfo *mi, char **cmdline_p, char *from) 160{ 161 char c = ' ', *to = command_line; 162 int usermem = 0, len = 0; 163 164 for (;;) { 165 if (c == ' ' && !memcmp(from, "mem=", 4)) { 166 unsigned long size, start; 167 168 if (to != command_line) 169 to -= 1; 170 171 /* 172 * If the user specifies memory size, we 173 * blow away any automatically generated 174 * size. 175 */ 176 if (usermem == 0) { 177 usermem = 1; 178 mi->nr_banks = 0; 179 } 180 181 start = PHYS_OFFSET; 182 size = memparse(from + 4, &from); 183 if (*from == '@') 184 start = memparse(from + 1, &from); 185 186 mi->bank[mi->nr_banks].start = start; 187 mi->bank[mi->nr_banks].size = size; 188 mi->bank[mi->nr_banks].node = PHYS_TO_NID(start); 189 mi->nr_banks += 1; 190 } 191 c = *from++; 192 if (!c) 193 break; 194 if (COMMAND_LINE_SIZE <= ++len) 195 break; 196 *to++ = c; 197 } 198 *to = '\0'; 199 *cmdline_p = command_line; 200} 201 202static void __init 203setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz) 204{ 205#ifdef CONFIG_BLK_DEV_RAM 206 extern int rd_size, rd_image_start, rd_prompt, rd_doload; 207 208 rd_image_start = image_start; 209 rd_prompt = prompt; 210 rd_doload = doload; 211 212 if (rd_sz) 213 rd_size = rd_sz; 214#endif 215} 216 217static void __init 218request_standard_resources(struct meminfo *mi) 219{ 220 struct resource *res; 221 int i; 222 223 kernel_code.start = init_mm.start_code; 224 kernel_code.end = init_mm.end_code - 1; 225#ifdef CONFIG_XIP_KERNEL 226 kernel_data.start = init_mm.start_data; 227#else 228 kernel_data.start = init_mm.end_code; 229#endif 230 kernel_data.end = init_mm.brk - 1; 231 232 for (i = 0; i < mi->nr_banks; i++) { 233 unsigned long virt_start, virt_end; 234 235 if (mi->bank[i].size == 0) 236 continue; 237 238 virt_start = mi->bank[i].start; 239 virt_end = virt_start + mi->bank[i].size - 1; 240 241 res = alloc_bootmem_low(sizeof(*res)); 242 res->name = "System RAM"; 243 res->start = virt_start; 244 res->end = virt_end; 245 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 246 247 request_resource(&iomem_resource, res); 248 249 if (kernel_code.start >= res->start && 250 kernel_code.end <= res->end) 251 request_resource(res, &kernel_code); 252 if (kernel_data.start >= res->start && 253 kernel_data.end <= res->end) 254 request_resource(res, &kernel_data); 255 } 256 257 258 /* 259 * Some machines don't have the possibility of ever 260 * possessing lp1 or lp2 261 */ 262 if (0) 263 request_resource(&ioport_resource, &lp0); 264} 265 266/* 267 * Tag parsing. 268 * 269 * This is the new way of passing data to the kernel at boot time. Rather 270 * than passing a fixed inflexible structure to the kernel, we pass a list 271 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE 272 * tag for the list to be recognised (to distinguish the tagged list from 273 * a param_struct). The list is terminated with a zero-length tag (this tag 274 * is not parsed in any way). 275 */ 276static int __init parse_tag_core(const struct tag *tag) 277{ 278 if (tag->hdr.size > 2) { 279 if ((tag->u.core.flags & 1) == 0) 280 root_mountflags &= ~MS_RDONLY; 281 ROOT_DEV = old_decode_dev(tag->u.core.rootdev); 282 } 283 return 0; 284} 285 286__tagtable(ATAG_CORE, parse_tag_core); 287 288static int __init parse_tag_mem32(const struct tag *tag) 289{ 290 if (meminfo.nr_banks >= NR_BANKS) { 291 printk(KERN_WARNING 292 "Ignoring memory bank 0x%08x size %dKB\n", 293 tag->u.mem.start, tag->u.mem.size / 1024); 294 return -EINVAL; 295 } 296 meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start; 297 meminfo.bank[meminfo.nr_banks].size = tag->u.mem.size; 298 meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(tag->u.mem.start); 299 meminfo.nr_banks += 1; 300 301 return 0; 302} 303 304__tagtable(ATAG_MEM, parse_tag_mem32); 305 306#if defined(CONFIG_DUMMY_CONSOLE) 307struct screen_info screen_info = { 308 .orig_video_lines = 30, 309 .orig_video_cols = 80, 310 .orig_video_mode = 0, 311 .orig_video_ega_bx = 0, 312 .orig_video_isVGA = 1, 313 .orig_video_points = 8 314}; 315 316static int __init parse_tag_videotext(const struct tag *tag) 317{ 318 screen_info.orig_x = tag->u.videotext.x; 319 screen_info.orig_y = tag->u.videotext.y; 320 screen_info.orig_video_page = tag->u.videotext.video_page; 321 screen_info.orig_video_mode = tag->u.videotext.video_mode; 322 screen_info.orig_video_cols = tag->u.videotext.video_cols; 323 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx; 324 screen_info.orig_video_lines = tag->u.videotext.video_lines; 325 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga; 326 screen_info.orig_video_points = tag->u.videotext.video_points; 327 return 0; 328} 329 330__tagtable(ATAG_VIDEOTEXT, parse_tag_videotext); 331#endif 332 333static int __init parse_tag_acorn(const struct tag *tag) 334{ 335 memc_ctrl_reg = tag->u.acorn.memc_control_reg; 336 number_mfm_drives = tag->u.acorn.adfsdrives; 337 return 0; 338} 339 340__tagtable(ATAG_ACORN, parse_tag_acorn); 341 342static int __init parse_tag_ramdisk(const struct tag *tag) 343{ 344 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0, 345 (tag->u.ramdisk.flags & 2) == 0, 346 tag->u.ramdisk.start, tag->u.ramdisk.size); 347 return 0; 348} 349 350__tagtable(ATAG_RAMDISK, parse_tag_ramdisk); 351 352static int __init parse_tag_initrd(const struct tag *tag) 353{ 354 printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n"); 355 phys_initrd_start = (unsigned long)tag->u.initrd.start; 356 phys_initrd_size = (unsigned long)tag->u.initrd.size; 357 return 0; 358} 359 360__tagtable(ATAG_INITRD, parse_tag_initrd); 361 362static int __init parse_tag_initrd2(const struct tag *tag) 363{ 364 printk(KERN_WARNING "ATAG_INITRD is deprecated; please update your bootloader. \n"); 365 phys_initrd_start = (unsigned long)tag->u.initrd.start; 366 phys_initrd_size = (unsigned long)tag->u.initrd.size; 367 return 0; 368} 369 370__tagtable(ATAG_INITRD2, parse_tag_initrd2); 371 372static int __init parse_tag_serialnr(const struct tag *tag) 373{ 374 system_serial_low = tag->u.serialnr.low; 375 system_serial_high = tag->u.serialnr.high; 376 return 0; 377} 378 379__tagtable(ATAG_SERIAL, parse_tag_serialnr); 380 381static int __init parse_tag_revision(const struct tag *tag) 382{ 383 system_rev = tag->u.revision.rev; 384 return 0; 385} 386 387__tagtable(ATAG_REVISION, parse_tag_revision); 388 389static int __init parse_tag_cmdline(const struct tag *tag) 390{ 391 strncpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE); 392 default_command_line[COMMAND_LINE_SIZE - 1] = '\0'; 393 return 0; 394} 395 396__tagtable(ATAG_CMDLINE, parse_tag_cmdline); 397 398/* 399 * Scan the tag table for this tag, and call its parse function. 400 * The tag table is built by the linker from all the __tagtable 401 * declarations. 402 */ 403static int __init parse_tag(const struct tag *tag) 404{ 405 extern struct tagtable __tagtable_begin, __tagtable_end; 406 struct tagtable *t; 407 408 for (t = &__tagtable_begin; t < &__tagtable_end; t++) 409 if (tag->hdr.tag == t->tag) { 410 t->parse(tag); 411 break; 412 } 413 414 return t < &__tagtable_end; 415} 416 417/* 418 * Parse all tags in the list, checking both the global and architecture 419 * specific tag tables. 420 */ 421static void __init parse_tags(const struct tag *t) 422{ 423 for (; t->hdr.size; t = tag_next(t)) 424 if (!parse_tag(t)) 425 printk(KERN_WARNING 426 "Ignoring unrecognised tag 0x%08x\n", 427 t->hdr.tag); 428} 429 430/* 431 * This holds our defaults. 432 */ 433static struct init_tags { 434 struct tag_header hdr1; 435 struct tag_core core; 436 struct tag_header hdr2; 437 struct tag_mem32 mem; 438 struct tag_header hdr3; 439} init_tags __initdata = { 440 { tag_size(tag_core), ATAG_CORE }, 441 { 1, PAGE_SIZE, 0xff }, 442 { tag_size(tag_mem32), ATAG_MEM }, 443 { MEM_SIZE, PHYS_OFFSET }, 444 { 0, ATAG_NONE } 445}; 446 447void __init setup_arch(char **cmdline_p) 448{ 449 struct tag *tags = (struct tag *)&init_tags; 450 char *from = default_command_line; 451 452 setup_processor(); 453 if(machine_arch_type == MACH_TYPE_A5K) 454 machine_name = "A5000"; 455 else if(machine_arch_type == MACH_TYPE_ARCHIMEDES) 456 machine_name = "Archimedes"; 457 else 458 machine_name = "UNKNOWN"; 459 460 // of RAM that is accidentally reserved along with video RAM. perhaps 461 // it would be a good idea to explicitly reserve this? 462 463 tags = (struct tag *)0x0207c000; 464 465 /* 466 * If we have the old style parameters, convert them to 467 * a tag list. 468 */ 469 if (tags->hdr.tag != ATAG_CORE) 470 convert_to_tag_list(tags); 471 if (tags->hdr.tag != ATAG_CORE) 472 tags = (struct tag *)&init_tags; 473 if (tags->hdr.tag == ATAG_CORE) { 474 if (meminfo.nr_banks != 0) 475 squash_mem_tags(tags); 476 parse_tags(tags); 477 } 478 479 init_mm.start_code = (unsigned long) &_text; 480#ifndef CONFIG_XIP_KERNEL 481 init_mm.end_code = (unsigned long) &_etext; 482#else 483 init_mm.end_code = (unsigned long) &_endtext; 484 init_mm.start_data = (unsigned long) &_sdata; 485#endif 486 init_mm.end_data = (unsigned long) &_edata; 487 init_mm.brk = (unsigned long) &_end; 488 489 memcpy(boot_command_line, from, COMMAND_LINE_SIZE); 490 boot_command_line[COMMAND_LINE_SIZE-1] = '\0'; 491 parse_cmdline(&meminfo, cmdline_p, from); 492 bootmem_init(&meminfo); 493 paging_init(&meminfo); 494 request_standard_resources(&meminfo); 495 496#ifdef CONFIG_VT 497#if defined(CONFIG_DUMMY_CONSOLE) 498 conswitchp = &dummy_con; 499#endif 500#endif 501} 502 503static const char *hwcap_str[] = { 504 "swp", 505 "half", 506 "thumb", 507 "26bit", 508 "fastmult", 509 "fpa", 510 "vfp", 511 "edsp", 512 NULL 513}; 514 515static int c_show(struct seq_file *m, void *v) 516{ 517 int i; 518 519 seq_printf(m, "Processor\t: %s %s rev %d (%s)\n", 520 proc_info.manufacturer, proc_info.cpu_name, 521 (int)processor_id & 15, elf_platform); 522 523 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", 524 loops_per_jiffy / (500000/HZ), 525 (loops_per_jiffy / (5000/HZ)) % 100); 526 527 /* dump out the processor features */ 528 seq_puts(m, "Features\t: "); 529 530 for (i = 0; hwcap_str[i]; i++) 531 if (elf_hwcap & (1 << i)) 532 seq_printf(m, "%s ", hwcap_str[i]); 533 534 seq_puts(m, "\n"); 535 536 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4); 537 seq_printf(m, "CPU revision\t: %d\n\n", processor_id & 15); 538 seq_printf(m, "Hardware\t: %s\n", machine_name); 539 seq_printf(m, "Revision\t: %04x\n", system_rev); 540 seq_printf(m, "Serial\t\t: %08x%08x\n", 541 system_serial_high, system_serial_low); 542 543 return 0; 544} 545 546static void *c_start(struct seq_file *m, loff_t *pos) 547{ 548 return *pos < 1 ? (void *)1 : NULL; 549} 550 551static void *c_next(struct seq_file *m, void *v, loff_t *pos) 552{ 553 ++*pos; 554 return NULL; 555} 556 557static void c_stop(struct seq_file *m, void *v) 558{ 559} 560 561struct seq_operations cpuinfo_op = { 562 .start = c_start, 563 .next = c_next, 564 .stop = c_stop, 565 .show = c_show 566}; 567