arch/arm/kernel/setup.c

   1 /*
   2  *  linux/arch/arm/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995-2001 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/module.h>
  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/initrd.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 #include <linux/cpu.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/smp.h>
  26
  27 #include <asm/cpu.h>
  28 #include <asm/elf.h>
  29 #include <asm/procinfo.h>
  30 #include <asm/setup.h>
  31 #include <asm/mach-types.h>
  32 #include <asm/cacheflush.h>
  33 #include <asm/tlbflush.h>
  34
  35 #include <asm/mach/arch.h>
  36 #include <asm/mach/irq.h>
  37 #include <asm/mach/time.h>
  38
  39 #include "compat.h"
  40
  41 #ifndef MEM_SIZE
  42 #define MEM_SIZE        (16*1024*1024)
  43 #endif
  44
  45 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  46 char fpe_type[8];
  47
  48 static int __init fpe_setup(char *line)
  49 {
  50         memcpy(fpe_type, line, 8);
  51         return 1;
  52 }
  53
  54 __setup("fpe=", fpe_setup);
  55 #endif
  56
  57 extern void paging_init(struct meminfo *, struct machine_desc *desc);
  58 extern void reboot_setup(char *str);
  59 extern int root_mountflags;
  60 extern void _stext, _text, _etext, __data_start, _edata, _end;
  61
  62 unsigned int processor_id;
  63 unsigned int __machine_arch_type;
  64 EXPORT_SYMBOL(__machine_arch_type);
  65
  66 unsigned int system_rev;
  67 EXPORT_SYMBOL(system_rev);
  68
  69 unsigned int system_serial_low;
  70 EXPORT_SYMBOL(system_serial_low);
  71
  72 unsigned int system_serial_high;
  73 EXPORT_SYMBOL(system_serial_high);
  74
  75 unsigned int elf_hwcap;
  76 EXPORT_SYMBOL(elf_hwcap);
  77
  78
  79 #ifdef MULTI_CPU
  80 struct processor processor;
  81 #endif
  82 #ifdef MULTI_TLB
  83 struct cpu_tlb_fns cpu_tlb;
  84 #endif
  85 #ifdef MULTI_USER
  86 struct cpu_user_fns cpu_user;
  87 #endif
  88 #ifdef MULTI_CACHE
  89 struct cpu_cache_fns cpu_cache;
  90 #endif
  91 #ifdef CONFIG_OUTER_CACHE
  92 struct outer_cache_fns outer_cache;
  93 #endif
  94
  95 struct stack {
  96         u32 irq[3];
  97         u32 abt[3];
  98         u32 und[3];
  99 } ____cacheline_aligned;
 100
 101 static struct stack stacks[NR_CPUS];
 102
 103 char elf_platform[ELF_PLATFORM_SIZE];
 104 EXPORT_SYMBOL(elf_platform);
 105
 106 unsigned long phys_initrd_start __initdata = 0;
 107 unsigned long phys_initrd_size __initdata = 0;
 108
 109 static struct meminfo meminfo __initdata = { 0, };
 110 static const char *cpu_name;
 111 static const char *machine_name;
 112 static char __initdata command_line[COMMAND_LINE_SIZE];
 113
 114 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 115 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 116 #define ENDIANNESS ((char)endian_test.l)
 117
 118 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 119
 120 /*
 121  * Standard memory resources
 122  */
 123 static struct resource mem_res[] = {
 124         {
 125                 .name = "Video RAM",
 126                 .start = 0,
 127                 .end = 0,
 128                 .flags = IORESOURCE_MEM
 129         },
 130         {
 131                 .name = "Kernel text",
 132                 .start = 0,
 133                 .end = 0,
 134                 .flags = IORESOURCE_MEM
 135         },
 136         {
 137                 .name = "Kernel data",
 138                 .start = 0,
 139                 .end = 0,
 140                 .flags = IORESOURCE_MEM
 141         }
 142 };
 143
 144 #define video_ram   mem_res[0]
 145 #define kernel_code mem_res[1]
 146 #define kernel_data mem_res[2]
 147
 148 static struct resource io_res[] = {
 149         {
 150                 .name = "reserved",
 151                 .start = 0x3bc,
 152                 .end = 0x3be,
 153                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 154         },
 155         {
 156                 .name = "reserved",
 157                 .start = 0x378,
 158                 .end = 0x37f,
 159                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 160         },
 161         {
 162                 .name = "reserved",
 163                 .start = 0x278,
 164                 .end = 0x27f,
 165                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 166         }
 167 };
 168
 169 #define lp0 io_res[0]
 170 #define lp1 io_res[1]
 171 #define lp2 io_res[2]
 172
 173 static const char *cache_types[16] = {
 174         "write-through",
 175         "write-back",
 176         "write-back",
 177         "undefined 3",
 178         "undefined 4",
 179         "undefined 5",
 180         "write-back",
 181         "write-back",
 182         "undefined 8",
 183         "undefined 9",
 184         "undefined 10",
 185         "undefined 11",
 186         "undefined 12",
 187         "undefined 13",
 188         "write-back",
 189         "undefined 15",
 190 };
 191
 192 static const char *cache_clean[16] = {
 193         "not required",
 194         "read-block",
 195         "cp15 c7 ops",
 196         "undefined 3",
 197         "undefined 4",
 198         "undefined 5",
 199         "cp15 c7 ops",
 200         "cp15 c7 ops",
 201         "undefined 8",
 202         "undefined 9",
 203         "undefined 10",
 204         "undefined 11",
 205         "undefined 12",
 206         "undefined 13",
 207         "cp15 c7 ops",
 208         "undefined 15",
 209 };
 210
 211 static const char *cache_lockdown[16] = {
 212         "not supported",
 213         "not supported",
 214         "not supported",
 215         "undefined 3",
 216         "undefined 4",
 217         "undefined 5",
 218         "format A",
 219         "format B",
 220         "undefined 8",
 221         "undefined 9",
 222         "undefined 10",
 223         "undefined 11",
 224         "undefined 12",
 225         "undefined 13",
 226         "format C",
 227         "undefined 15",
 228 };
 229
 230 static const char *proc_arch[] = {
 231         "undefined/unknown",
 232         "3",
 233         "4",
 234         "4T",
 235         "5",
 236         "5T",
 237         "5TE",
 238         "5TEJ",
 239         "6TEJ",
 240         "7",
 241         "?(11)",
 242         "?(12)",
 243         "?(13)",
 244         "?(14)",
 245         "?(15)",
 246         "?(16)",
 247         "?(17)",
 248 };
 249
 250 #define CACHE_TYPE(x)   (((x) >> 25) & 15)
 251 #define CACHE_S(x)      ((x) & (1 << 24))
 252 #define CACHE_DSIZE(x)  (((x) >> 12) & 4095)    /* only if S=1 */
 253 #define CACHE_ISIZE(x)  ((x) & 4095)
 254
 255 #define CACHE_SIZE(y)   (((y) >> 6) & 7)
 256 #define CACHE_ASSOC(y)  (((y) >> 3) & 7)
 257 #define CACHE_M(y)      ((y) & (1 << 2))
 258 #define CACHE_LINE(y)   ((y) & 3)
 259
 260 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
 261 {
 262         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 263
 264         printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
 265                 cpu, prefix,
 266                 mult << (8 + CACHE_SIZE(cache)),
 267                 (mult << CACHE_ASSOC(cache)) >> 1,
 268                 8 << CACHE_LINE(cache),
 269                 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 270                         CACHE_LINE(cache)));
 271 }
 272
 273 static void __init dump_cpu_info(int cpu)
 274 {
 275         unsigned int info = read_cpuid(CPUID_CACHETYPE);
 276
 277         if (info != processor_id) {
 278                 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
 279                        cache_types[CACHE_TYPE(info)]);
 280                 if (CACHE_S(info)) {
 281                         dump_cache("I cache", cpu, CACHE_ISIZE(info));
 282                         dump_cache("D cache", cpu, CACHE_DSIZE(info));
 283                 } else {
 284                         dump_cache("cache", cpu, CACHE_ISIZE(info));
 285                 }
 286         }
 287
 288         if (arch_is_coherent())
 289                 printk("Cache coherency enabled\n");
 290 }
 291
 292 int cpu_architecture(void)
 293 {
 294         int cpu_arch;
 295
 296         if ((processor_id & 0x0008f000) == 0) {
 297                 cpu_arch = CPU_ARCH_UNKNOWN;
 298         } else if ((processor_id & 0x0008f000) == 0x00007000) {
 299                 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 300         } else if ((processor_id & 0x00080000) == 0x00000000) {
 301                 cpu_arch = (processor_id >> 16) & 7;
 302                 if (cpu_arch)
 303                         cpu_arch += CPU_ARCH_ARMv3;
 304         } else {
 305                 /* the revised CPUID */
 306                 cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
 307         }
 308
 309         return cpu_arch;
 310 }
 311
 312 /*
 313  * These functions re-use the assembly code in head.S, which
 314  * already provide the required functionality.
 315  */
 316 extern struct proc_info_list *lookup_processor_type(unsigned int);
 317 extern struct machine_desc *lookup_machine_type(unsigned int);
 318
 319 static void __init setup_processor(void)
 320 {
 321         struct proc_info_list *list;
 322
 323         /*
 324          * locate processor in the list of supported processor
 325          * types.  The linker builds this table for us from the
 326          * entries in arch/arm/mm/proc-*.S
 327          */
 328         list = lookup_processor_type(processor_id);
 329         if (!list) {
 330                 printk("CPU configuration botched (ID %08x), unable "
 331                        "to continue.\n", processor_id);
 332                 while (1);
 333         }
 334
 335         cpu_name = list->cpu_name;
 336
 337 #ifdef MULTI_CPU
 338         processor = *list->proc;
 339 #endif
 340 #ifdef MULTI_TLB
 341         cpu_tlb = *list->tlb;
 342 #endif
 343 #ifdef MULTI_USER
 344         cpu_user = *list->user;
 345 #endif
 346 #ifdef MULTI_CACHE
 347         cpu_cache = *list->cache;
 348 #endif
 349
 350         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 351                cpu_name, processor_id, (int)processor_id & 15,
 352                proc_arch[cpu_architecture()], cr_alignment);
 353
 354         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 355         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 356         elf_hwcap = list->elf_hwcap;
 357 #ifndef CONFIG_ARM_THUMB
 358         elf_hwcap &= ~HWCAP_THUMB;
 359 #endif
 360
 361         cpu_proc_init();
 362 }
 363
 364 /*
 365  * cpu_init - initialise one CPU.
 366  *
 367  * cpu_init dumps the cache information, initialises SMP specific
 368  * information, and sets up the per-CPU stacks.
 369  */
 370 void cpu_init(void)
 371 {
 372         unsigned int cpu = smp_processor_id();
 373         struct stack *stk = &stacks[cpu];
 374
 375         if (cpu >= NR_CPUS) {
 376                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 377                 BUG();
 378         }
 379
 380         if (system_state == SYSTEM_BOOTING)
 381                 dump_cpu_info(cpu);
 382
 383         /*
 384          * setup stacks for re-entrant exception handlers
 385          */
 386         __asm__ (
 387         "msr    cpsr_c, %1\n\t"
 388         "add    sp, %0, %2\n\t"
 389         "msr    cpsr_c, %3\n\t"
 390         "add    sp, %0, %4\n\t"
 391         "msr    cpsr_c, %5\n\t"
 392         "add    sp, %0, %6\n\t"
 393         "msr    cpsr_c, %7"
 394             :
 395             : "r" (stk),
 396               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 397               "I" (offsetof(struct stack, irq[0])),
 398               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 399               "I" (offsetof(struct stack, abt[0])),
 400               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 401               "I" (offsetof(struct stack, und[0])),
 402               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 403             : "r14");
 404 }
 405
 406 static struct machine_desc * __init setup_machine(unsigned int nr)
 407 {
 408         struct machine_desc *list;
 409
 410         /*
 411          * locate machine in the list of supported machines.
 412          */
 413         list = lookup_machine_type(nr);
 414         if (!list) {
 415                 printk("Machine configuration botched (nr %d), unable "
 416                        "to continue.\n", nr);
 417                 while (1);
 418         }
 419
 420         printk("Machine: %s\n", list->name);
 421
 422         return list;
 423 }
 424
 425 static void __init early_initrd(char **p)
 426 {
 427         unsigned long start, size;
 428
 429         start = memparse(*p, p);
 430         if (**p == ',') {
 431                 size = memparse((*p) + 1, p);
 432
 433                 phys_initrd_start = start;
 434                 phys_initrd_size = size;
 435         }
 436 }
 437 __early_param("initrd=", early_initrd);
 438
 439 static void __init arm_add_memory(unsigned long start, unsigned long size)
 440 {
 441         struct membank *bank;
 442
 443         /*
 444          * Ensure that start/size are aligned to a page boundary.
 445          * Size is appropriately rounded down, start is rounded up.
 446          */
 447         size -= start & ~PAGE_MASK;
 448
 449         bank = &meminfo.bank[meminfo.nr_banks++];
 450
 451         bank->start = PAGE_ALIGN(start);
 452         bank->size  = size & PAGE_MASK;
 453         bank->node  = PHYS_TO_NID(start);
 454 }
 455
 456 /*
 457  * Pick out the memory size.  We look for mem=size@start,
 458  * where start and size are "size[KkMm]"
 459  */
 460 static void __init early_mem(char **p)
 461 {
 462         static int usermem __initdata = 0;
 463         unsigned long size, start;
 464
 465         /*
 466          * If the user specifies memory size, we
 467          * blow away any automatically generated
 468          * size.
 469          */
 470         if (usermem == 0) {
 471                 usermem = 1;
 472                 meminfo.nr_banks = 0;
 473         }
 474
 475         start = PHYS_OFFSET;
 476         size  = memparse(*p, p);
 477         if (**p == '@')
 478                 start = memparse(*p + 1, p);
 479
 480         arm_add_memory(start, size);
 481 }
 482 __early_param("mem=", early_mem);
 483
 484 /*
 485  * Initial parsing of the command line.
 486  */
 487 static void __init parse_cmdline(char **cmdline_p, char *from)
 488 {
 489         char c = ' ', *to = command_line;
 490         int len = 0;
 491
 492         for (;;) {
 493                 if (c == ' ') {
 494                         extern struct early_params __early_begin, __early_end;
 495                         struct early_params *p;
 496
 497                         for (p = &__early_begin; p < &__early_end; p++) {
 498                                 int len = strlen(p->arg);
 499
 500                                 if (memcmp(from, p->arg, len) == 0) {
 501                                         if (to != command_line)
 502                                                 to -= 1;
 503                                         from += len;
 504                                         p->fn(&from);
 505
 506                                         while (*from != ' ' && *from != '\0')
 507                                                 from++;
 508                                         break;
 509                                 }
 510                         }
 511                 }
 512                 c = *from++;
 513                 if (!c)
 514                         break;
 515                 if (COMMAND_LINE_SIZE <= ++len)
 516                         break;
 517                 *to++ = c;
 518         }
 519         *to = '\0';
 520         *cmdline_p = command_line;
 521 }
 522
 523 static void __init
 524 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 525 {
 526 #ifdef CONFIG_BLK_DEV_RAM
 527         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 528
 529         rd_image_start = image_start;
 530         rd_prompt = prompt;
 531         rd_doload = doload;
 532
 533         if (rd_sz)
 534                 rd_size = rd_sz;
 535 #endif
 536 }
 537
 538 static void __init
 539 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
 540 {
 541         struct resource *res;
 542         int i;
 543
 544         kernel_code.start   = virt_to_phys(&_text);
 545         kernel_code.end     = virt_to_phys(&_etext - 1);
 546         kernel_data.start   = virt_to_phys(&__data_start);
 547         kernel_data.end     = virt_to_phys(&_end - 1);
 548
 549         for (i = 0; i < mi->nr_banks; i++) {
 550                 unsigned long virt_start, virt_end;
 551
 552                 if (mi->bank[i].size == 0)
 553                         continue;
 554
 555                 virt_start = __phys_to_virt(mi->bank[i].start);
 556                 virt_end   = virt_start + mi->bank[i].size - 1;
 557
 558                 res = alloc_bootmem_low(sizeof(*res));
 559                 res->name  = "System RAM";
 560                 res->start = __virt_to_phys(virt_start);
 561                 res->end   = __virt_to_phys(virt_end);
 562                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 563
 564                 request_resource(&iomem_resource, res);
 565
 566                 if (kernel_code.start >= res->start &&
 567                     kernel_code.end <= res->end)
 568                         request_resource(res, &kernel_code);
 569                 if (kernel_data.start >= res->start &&
 570                     kernel_data.end <= res->end)
 571                         request_resource(res, &kernel_data);
 572         }
 573
 574         if (mdesc->video_start) {
 575                 video_ram.start = mdesc->video_start;
 576                 video_ram.end   = mdesc->video_end;
 577                 request_resource(&iomem_resource, &video_ram);
 578         }
 579
 580         /*
 581          * Some machines don't have the possibility of ever
 582          * possessing lp0, lp1 or lp2
 583          */
 584         if (mdesc->reserve_lp0)
 585                 request_resource(&ioport_resource, &lp0);
 586         if (mdesc->reserve_lp1)
 587                 request_resource(&ioport_resource, &lp1);
 588         if (mdesc->reserve_lp2)
 589                 request_resource(&ioport_resource, &lp2);
 590 }
 591
 592 /*
 593  *  Tag parsing.
 594  *
 595  * This is the new way of passing data to the kernel at boot time.  Rather
 596  * than passing a fixed inflexible structure to the kernel, we pass a list
 597  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 598  * tag for the list to be recognised (to distinguish the tagged list from
 599  * a param_struct).  The list is terminated with a zero-length tag (this tag
 600  * is not parsed in any way).
 601  */
 602 static int __init parse_tag_core(const struct tag *tag)
 603 {
 604         if (tag->hdr.size > 2) {
 605                 if ((tag->u.core.flags & 1) == 0)
 606                         root_mountflags &= ~MS_RDONLY;
 607                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 608         }
 609         return 0;
 610 }
 611
 612 __tagtable(ATAG_CORE, parse_tag_core);
 613
 614 static int __init parse_tag_mem32(const struct tag *tag)
 615 {
 616         if (meminfo.nr_banks >= NR_BANKS) {
 617                 printk(KERN_WARNING
 618                        "Ignoring memory bank 0x%08x size %dKB\n",
 619                         tag->u.mem.start, tag->u.mem.size / 1024);
 620                 return -EINVAL;
 621         }
 622         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 623         return 0;
 624 }
 625
 626 __tagtable(ATAG_MEM, parse_tag_mem32);
 627
 628 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 629 struct screen_info screen_info = {
 630  .orig_video_lines      = 30,
 631  .orig_video_cols       = 80,
 632  .orig_video_mode       = 0,
 633  .orig_video_ega_bx     = 0,
 634  .orig_video_isVGA      = 1,
 635  .orig_video_points     = 8
 636 };
 637
 638 static int __init parse_tag_videotext(const struct tag *tag)
 639 {
 640         screen_info.orig_x            = tag->u.videotext.x;
 641         screen_info.orig_y            = tag->u.videotext.y;
 642         screen_info.orig_video_page   = tag->u.videotext.video_page;
 643         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 644         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 645         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 646         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 647         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 648         screen_info.orig_video_points = tag->u.videotext.video_points;
 649         return 0;
 650 }
 651
 652 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 653 #endif
 654
 655 static int __init parse_tag_ramdisk(const struct tag *tag)
 656 {
 657         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 658                       (tag->u.ramdisk.flags & 2) == 0,
 659                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 660         return 0;
 661 }
 662
 663 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 664
 665 static int __init parse_tag_initrd(const struct tag *tag)
 666 {
 667         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
 668                 "please update your bootloader.\n");
 669         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
 670         phys_initrd_size = tag->u.initrd.size;
 671         return 0;
 672 }
 673
 674 __tagtable(ATAG_INITRD, parse_tag_initrd);
 675
 676 static int __init parse_tag_initrd2(const struct tag *tag)
 677 {
 678         phys_initrd_start = tag->u.initrd.start;
 679         phys_initrd_size = tag->u.initrd.size;
 680         return 0;
 681 }
 682
 683 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 684
 685 static int __init parse_tag_serialnr(const struct tag *tag)
 686 {
 687         system_serial_low = tag->u.serialnr.low;
 688         system_serial_high = tag->u.serialnr.high;
 689         return 0;
 690 }
 691
 692 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 693
 694 static int __init parse_tag_revision(const struct tag *tag)
 695 {
 696         system_rev = tag->u.revision.rev;
 697         return 0;
 698 }
 699
 700 __tagtable(ATAG_REVISION, parse_tag_revision);
 701
 702 static int __init parse_tag_cmdline(const struct tag *tag)
 703 {
 704         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 705         return 0;
 706 }
 707
 708 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 709
 710 /*
 711  * Scan the tag table for this tag, and call its parse function.
 712  * The tag table is built by the linker from all the __tagtable
 713  * declarations.
 714  */
 715 static int __init parse_tag(const struct tag *tag)
 716 {
 717         extern struct tagtable __tagtable_begin, __tagtable_end;
 718         struct tagtable *t;
 719
 720         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 721                 if (tag->hdr.tag == t->tag) {
 722                         t->parse(tag);
 723                         break;
 724                 }
 725
 726         return t < &__tagtable_end;
 727 }
 728
 729 /*
 730  * Parse all tags in the list, checking both the global and architecture
 731  * specific tag tables.
 732  */
 733 static void __init parse_tags(const struct tag *t)
 734 {
 735         for (; t->hdr.size; t = tag_next(t))
 736                 if (!parse_tag(t))
 737                         printk(KERN_WARNING
 738                                 "Ignoring unrecognised tag 0x%08x\n",
 739                                 t->hdr.tag);
 740 }
 741
 742 /*
 743  * This holds our defaults.
 744  */
 745 static struct init_tags {
 746         struct tag_header hdr1;
 747         struct tag_core   core;
 748         struct tag_header hdr2;
 749         struct tag_mem32  mem;
 750         struct tag_header hdr3;
 751 } init_tags __initdata = {
 752         { tag_size(tag_core), ATAG_CORE },
 753         { 1, PAGE_SIZE, 0xff },
 754         { tag_size(tag_mem32), ATAG_MEM },
 755         { MEM_SIZE, PHYS_OFFSET },
 756         { 0, ATAG_NONE }
 757 };
 758
 759 static void (*init_machine)(void) __initdata;
 760
 761 static int __init customize_machine(void)
 762 {
 763         /* customizes platform devices, or adds new ones */
 764         if (init_machine)
 765                 init_machine();
 766         return 0;
 767 }
 768 arch_initcall(customize_machine);
 769
 770 void __init setup_arch(char **cmdline_p)
 771 {
 772         struct tag *tags = (struct tag *)&init_tags;
 773         struct machine_desc *mdesc;
 774         char *from = default_command_line;
 775
 776         setup_processor();
 777         mdesc = setup_machine(machine_arch_type);
 778         machine_name = mdesc->name;
 779
 780         if (mdesc->soft_reboot)
 781                 reboot_setup("s");
 782
 783         if (mdesc->boot_params)
 784                 tags = phys_to_virt(mdesc->boot_params);
 785
 786         /*
 787          * If we have the old style parameters, convert them to
 788          * a tag list.
 789          */
 790         if (tags->hdr.tag != ATAG_CORE)
 791                 convert_to_tag_list(tags);
 792         if (tags->hdr.tag != ATAG_CORE)
 793                 tags = (struct tag *)&init_tags;
 794
 795         if (mdesc->fixup)
 796                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 797
 798         if (tags->hdr.tag == ATAG_CORE) {
 799                 if (meminfo.nr_banks != 0)
 800                         squash_mem_tags(tags);
 801                 parse_tags(tags);
 802         }
 803
 804         init_mm.start_code = (unsigned long) &_text;
 805         init_mm.end_code   = (unsigned long) &_etext;
 806         init_mm.end_data   = (unsigned long) &_edata;
 807         init_mm.brk        = (unsigned long) &_end;
 808
 809         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 810         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 811         parse_cmdline(cmdline_p, from);
 812         paging_init(&meminfo, mdesc);
 813         request_standard_resources(&meminfo, mdesc);
 814
 815 #ifdef CONFIG_SMP
 816         smp_init_cpus();
 817 #endif
 818
 819         cpu_init();
 820
 821         /*
 822          * Set up various architecture-specific pointers
 823          */
 824         init_arch_irq = mdesc->init_irq;
 825         system_timer = mdesc->timer;
 826         init_machine = mdesc->init_machine;
 827
 828 #ifdef CONFIG_VT
 829 #if defined(CONFIG_VGA_CONSOLE)
 830         conswitchp = &vga_con;
 831 #elif defined(CONFIG_DUMMY_CONSOLE)
 832         conswitchp = &dummy_con;
 833 #endif
 834 #endif
 835 }
 836
 837
 838 static int __init topology_init(void)
 839 {
 840         int cpu;
 841
 842         for_each_possible_cpu(cpu)
 843                 register_cpu(&per_cpu(cpu_data, cpu).cpu, cpu);
 844
 845         return 0;
 846 }
 847
 848 subsys_initcall(topology_init);
 849
 850 static const char *hwcap_str[] = {
 851         "swp",
 852         "half",
 853         "thumb",
 854         "26bit",
 855         "fastmult",
 856         "fpa",
 857         "vfp",
 858         "edsp",
 859         "java",
 860         "iwmmxt",
 861         "crunch",
 862         NULL
 863 };
 864
 865 static void
 866 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
 867 {
 868         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 869
 870         seq_printf(m, "%s size\t\t: %d\n"
 871                       "%s assoc\t\t: %d\n"
 872                       "%s line length\t: %d\n"
 873                       "%s sets\t\t: %d\n",
 874                 type, mult << (8 + CACHE_SIZE(cache)),
 875                 type, (mult << CACHE_ASSOC(cache)) >> 1,
 876                 type, 8 << CACHE_LINE(cache),
 877                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 878                             CACHE_LINE(cache)));
 879 }
 880
 881 static int c_show(struct seq_file *m, void *v)
 882 {
 883         int i;
 884
 885         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 886                    cpu_name, (int)processor_id & 15, elf_platform);
 887
 888 #if defined(CONFIG_SMP)
 889         for_each_online_cpu(i) {
 890                 /*
 891                  * glibc reads /proc/cpuinfo to determine the number of
 892                  * online processors, looking for lines beginning with
 893                  * "processor".  Give glibc what it expects.
 894                  */
 895                 seq_printf(m, "processor\t: %d\n", i);
 896                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 897                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 898                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 899         }
 900 #else /* CONFIG_SMP */
 901         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 902                    loops_per_jiffy / (500000/HZ),
 903                    (loops_per_jiffy / (5000/HZ)) % 100);
 904 #endif
 905
 906         /* dump out the processor features */
 907         seq_puts(m, "Features\t: ");
 908
 909         for (i = 0; hwcap_str[i]; i++)
 910                 if (elf_hwcap & (1 << i))
 911                         seq_printf(m, "%s ", hwcap_str[i]);
 912
 913         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
 914         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 915
 916         if ((processor_id & 0x0008f000) == 0x00000000) {
 917                 /* pre-ARM7 */
 918                 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
 919         } else {
 920                 if ((processor_id & 0x0008f000) == 0x00007000) {
 921                         /* ARM7 */
 922                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 923                                    (processor_id >> 16) & 127);
 924                 } else {
 925                         /* post-ARM7 */
 926                         seq_printf(m, "CPU variant\t: 0x%x\n",
 927                                    (processor_id >> 20) & 15);
 928                 }
 929                 seq_printf(m, "CPU part\t: 0x%03x\n",
 930                            (processor_id >> 4) & 0xfff);
 931         }
 932         seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
 933
 934         {
 935                 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
 936                 if (cache_info != processor_id) {
 937                         seq_printf(m, "Cache type\t: %s\n"
 938                                       "Cache clean\t: %s\n"
 939                                       "Cache lockdown\t: %s\n"
 940                                       "Cache format\t: %s\n",
 941                                    cache_types[CACHE_TYPE(cache_info)],
 942                                    cache_clean[CACHE_TYPE(cache_info)],
 943                                    cache_lockdown[CACHE_TYPE(cache_info)],
 944                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
 945
 946                         if (CACHE_S(cache_info)) {
 947                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
 948                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
 949                         } else {
 950                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
 951                         }
 952                 }
 953         }
 954
 955         seq_puts(m, "\n");
 956
 957         seq_printf(m, "Hardware\t: %s\n", machine_name);
 958         seq_printf(m, "Revision\t: %04x\n", system_rev);
 959         seq_printf(m, "Serial\t\t: %08x%08x\n",
 960                    system_serial_high, system_serial_low);
 961
 962         return 0;
 963 }
 964
 965 static void *c_start(struct seq_file *m, loff_t *pos)
 966 {
 967         return *pos < 1 ? (void *)1 : NULL;
 968 }
 969
 970 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 971 {
 972         ++*pos;
 973         return NULL;
 974 }
 975
 976 static void c_stop(struct seq_file *m, void *v)
 977 {
 978 }
 979
 980 struct seq_operations cpuinfo_op = {
 981         .start  = c_start,
 982         .next   = c_next,
 983         .stop   = c_stop,
 984         .show   = c_show
 985 };