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
  92 struct stack {
  93         u32 irq[3];
  94         u32 abt[3];
  95         u32 und[3];
  96 } ____cacheline_aligned;
  97
  98 static struct stack stacks[NR_CPUS];
  99
 100 char elf_platform[ELF_PLATFORM_SIZE];
 101 EXPORT_SYMBOL(elf_platform);
 102
 103 unsigned long phys_initrd_start __initdata = 0;
 104 unsigned long phys_initrd_size __initdata = 0;
 105
 106 static struct meminfo meminfo __initdata = { 0, };
 107 static const char *cpu_name;
 108 static const char *machine_name;
 109 static char command_line[COMMAND_LINE_SIZE];
 110
 111 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 112 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 113 #define ENDIANNESS ((char)endian_test.l)
 114
 115 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 116
 117 /*
 118  * Standard memory resources
 119  */
 120 static struct resource mem_res[] = {
 121         {
 122                 .name = "Video RAM",
 123                 .start = 0,
 124                 .end = 0,
 125                 .flags = IORESOURCE_MEM
 126         },
 127         {
 128                 .name = "Kernel text",
 129                 .start = 0,
 130                 .end = 0,
 131                 .flags = IORESOURCE_MEM
 132         },
 133         {
 134                 .name = "Kernel data",
 135                 .start = 0,
 136                 .end = 0,
 137                 .flags = IORESOURCE_MEM
 138         }
 139 };
 140
 141 #define video_ram   mem_res[0]
 142 #define kernel_code mem_res[1]
 143 #define kernel_data mem_res[2]
 144
 145 static struct resource io_res[] = {
 146         {
 147                 .name = "reserved",
 148                 .start = 0x3bc,
 149                 .end = 0x3be,
 150                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 151         },
 152         {
 153                 .name = "reserved",
 154                 .start = 0x378,
 155                 .end = 0x37f,
 156                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 157         },
 158         {
 159                 .name = "reserved",
 160                 .start = 0x278,
 161                 .end = 0x27f,
 162                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 163         }
 164 };
 165
 166 #define lp0 io_res[0]
 167 #define lp1 io_res[1]
 168 #define lp2 io_res[2]
 169
 170 static const char *cache_types[16] = {
 171         "write-through",
 172         "write-back",
 173         "write-back",
 174         "undefined 3",
 175         "undefined 4",
 176         "undefined 5",
 177         "write-back",
 178         "write-back",
 179         "undefined 8",
 180         "undefined 9",
 181         "undefined 10",
 182         "undefined 11",
 183         "undefined 12",
 184         "undefined 13",
 185         "write-back",
 186         "undefined 15",
 187 };
 188
 189 static const char *cache_clean[16] = {
 190         "not required",
 191         "read-block",
 192         "cp15 c7 ops",
 193         "undefined 3",
 194         "undefined 4",
 195         "undefined 5",
 196         "cp15 c7 ops",
 197         "cp15 c7 ops",
 198         "undefined 8",
 199         "undefined 9",
 200         "undefined 10",
 201         "undefined 11",
 202         "undefined 12",
 203         "undefined 13",
 204         "cp15 c7 ops",
 205         "undefined 15",
 206 };
 207
 208 static const char *cache_lockdown[16] = {
 209         "not supported",
 210         "not supported",
 211         "not supported",
 212         "undefined 3",
 213         "undefined 4",
 214         "undefined 5",
 215         "format A",
 216         "format B",
 217         "undefined 8",
 218         "undefined 9",
 219         "undefined 10",
 220         "undefined 11",
 221         "undefined 12",
 222         "undefined 13",
 223         "format C",
 224         "undefined 15",
 225 };
 226
 227 static const char *proc_arch[] = {
 228         "undefined/unknown",
 229         "3",
 230         "4",
 231         "4T",
 232         "5",
 233         "5T",
 234         "5TE",
 235         "5TEJ",
 236         "6TEJ",
 237         "7",
 238         "?(11)",
 239         "?(12)",
 240         "?(13)",
 241         "?(14)",
 242         "?(15)",
 243         "?(16)",
 244         "?(17)",
 245 };
 246
 247 #define CACHE_TYPE(x)   (((x) >> 25) & 15)
 248 #define CACHE_S(x)      ((x) & (1 << 24))
 249 #define CACHE_DSIZE(x)  (((x) >> 12) & 4095)    /* only if S=1 */
 250 #define CACHE_ISIZE(x)  ((x) & 4095)
 251
 252 #define CACHE_SIZE(y)   (((y) >> 6) & 7)
 253 #define CACHE_ASSOC(y)  (((y) >> 3) & 7)
 254 #define CACHE_M(y)      ((y) & (1 << 2))
 255 #define CACHE_LINE(y)   ((y) & 3)
 256
 257 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
 258 {
 259         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 260
 261         printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
 262                 cpu, prefix,
 263                 mult << (8 + CACHE_SIZE(cache)),
 264                 (mult << CACHE_ASSOC(cache)) >> 1,
 265                 8 << CACHE_LINE(cache),
 266                 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 267                         CACHE_LINE(cache)));
 268 }
 269
 270 static void __init dump_cpu_info(int cpu)
 271 {
 272         unsigned int info = read_cpuid(CPUID_CACHETYPE);
 273
 274         if (info != processor_id) {
 275                 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
 276                        cache_types[CACHE_TYPE(info)]);
 277                 if (CACHE_S(info)) {
 278                         dump_cache("I cache", cpu, CACHE_ISIZE(info));
 279                         dump_cache("D cache", cpu, CACHE_DSIZE(info));
 280                 } else {
 281                         dump_cache("cache", cpu, CACHE_ISIZE(info));
 282                 }
 283         }
 284
 285         if (arch_is_coherent())
 286                 printk("Cache coherency enabled\n");
 287 }
 288
 289 int cpu_architecture(void)
 290 {
 291         int cpu_arch;
 292
 293         if ((processor_id & 0x0008f000) == 0) {
 294                 cpu_arch = CPU_ARCH_UNKNOWN;
 295         } else if ((processor_id & 0x0008f000) == 0x00007000) {
 296                 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 297         } else if ((processor_id & 0x00080000) == 0x00000000) {
 298                 cpu_arch = (processor_id >> 16) & 7;
 299                 if (cpu_arch)
 300                         cpu_arch += CPU_ARCH_ARMv3;
 301         } else {
 302                 /* the revised CPUID */
 303                 cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
 304         }
 305
 306         return cpu_arch;
 307 }
 308
 309 /*
 310  * These functions re-use the assembly code in head.S, which
 311  * already provide the required functionality.
 312  */
 313 extern struct proc_info_list *lookup_processor_type(unsigned int);
 314 extern struct machine_desc *lookup_machine_type(unsigned int);
 315
 316 static void __init setup_processor(void)
 317 {
 318         struct proc_info_list *list;
 319
 320         /*
 321          * locate processor in the list of supported processor
 322          * types.  The linker builds this table for us from the
 323          * entries in arch/arm/mm/proc-*.S
 324          */
 325         list = lookup_processor_type(processor_id);
 326         if (!list) {
 327                 printk("CPU configuration botched (ID %08x), unable "
 328                        "to continue.\n", processor_id);
 329                 while (1);
 330         }
 331
 332         cpu_name = list->cpu_name;
 333
 334 #ifdef MULTI_CPU
 335         processor = *list->proc;
 336 #endif
 337 #ifdef MULTI_TLB
 338         cpu_tlb = *list->tlb;
 339 #endif
 340 #ifdef MULTI_USER
 341         cpu_user = *list->user;
 342 #endif
 343 #ifdef MULTI_CACHE
 344         cpu_cache = *list->cache;
 345 #endif
 346
 347         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 348                cpu_name, processor_id, (int)processor_id & 15,
 349                proc_arch[cpu_architecture()], cr_alignment);
 350
 351         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 352         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 353         elf_hwcap = list->elf_hwcap;
 354 #ifndef CONFIG_ARM_THUMB
 355         elf_hwcap &= ~HWCAP_THUMB;
 356 #endif
 357 #ifndef CONFIG_VFP
 358         elf_hwcap &= ~HWCAP_VFP;
 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(saved_command_line, from, COMMAND_LINE_SIZE);
 810         saved_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         NULL
 862 };
 863
 864 static void
 865 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
 866 {
 867         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 868
 869         seq_printf(m, "%s size\t\t: %d\n"
 870                       "%s assoc\t\t: %d\n"
 871                       "%s line length\t: %d\n"
 872                       "%s sets\t\t: %d\n",
 873                 type, mult << (8 + CACHE_SIZE(cache)),
 874                 type, (mult << CACHE_ASSOC(cache)) >> 1,
 875                 type, 8 << CACHE_LINE(cache),
 876                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 877                             CACHE_LINE(cache)));
 878 }
 879
 880 static int c_show(struct seq_file *m, void *v)
 881 {
 882         int i;
 883
 884         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 885                    cpu_name, (int)processor_id & 15, elf_platform);
 886
 887 #if defined(CONFIG_SMP)
 888         for_each_online_cpu(i) {
 889                 /*
 890                  * glibc reads /proc/cpuinfo to determine the number of
 891                  * online processors, looking for lines beginning with
 892                  * "processor".  Give glibc what it expects.
 893                  */
 894                 seq_printf(m, "processor\t: %d\n", i);
 895                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 896                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 897                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 898         }
 899 #else /* CONFIG_SMP */
 900         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 901                    loops_per_jiffy / (500000/HZ),
 902                    (loops_per_jiffy / (5000/HZ)) % 100);
 903 #endif
 904
 905         /* dump out the processor features */
 906         seq_puts(m, "Features\t: ");
 907
 908         for (i = 0; hwcap_str[i]; i++)
 909                 if (elf_hwcap & (1 << i))
 910                         seq_printf(m, "%s ", hwcap_str[i]);
 911
 912         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
 913         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 914
 915         if ((processor_id & 0x0008f000) == 0x00000000) {
 916                 /* pre-ARM7 */
 917                 seq_printf(m, "CPU part\t\t: %07x\n", processor_id >> 4);
 918         } else {
 919                 if ((processor_id & 0x0008f000) == 0x00007000) {
 920                         /* ARM7 */
 921                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 922                                    (processor_id >> 16) & 127);
 923                 } else {
 924                         /* post-ARM7 */
 925                         seq_printf(m, "CPU variant\t: 0x%x\n",
 926                                    (processor_id >> 20) & 15);
 927                 }
 928                 seq_printf(m, "CPU part\t: 0x%03x\n",
 929                            (processor_id >> 4) & 0xfff);
 930         }
 931         seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
 932
 933         {
 934                 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
 935                 if (cache_info != processor_id) {
 936                         seq_printf(m, "Cache type\t: %s\n"
 937                                       "Cache clean\t: %s\n"
 938                                       "Cache lockdown\t: %s\n"
 939                                       "Cache format\t: %s\n",
 940                                    cache_types[CACHE_TYPE(cache_info)],
 941                                    cache_clean[CACHE_TYPE(cache_info)],
 942                                    cache_lockdown[CACHE_TYPE(cache_info)],
 943                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
 944
 945                         if (CACHE_S(cache_info)) {
 946                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
 947                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
 948                         } else {
 949                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
 950                         }
 951                 }
 952         }
 953
 954         seq_puts(m, "\n");
 955
 956         seq_printf(m, "Hardware\t: %s\n", machine_name);
 957         seq_printf(m, "Revision\t: %04x\n", system_rev);
 958         seq_printf(m, "Serial\t\t: %08x%08x\n",
 959                    system_serial_high, system_serial_low);
 960
 961         return 0;
 962 }
 963
 964 static void *c_start(struct seq_file *m, loff_t *pos)
 965 {
 966         return *pos < 1 ? (void *)1 : NULL;
 967 }
 968
 969 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 970 {
 971         ++*pos;
 972         return NULL;
 973 }
 974
 975 static void c_stop(struct seq_file *m, void *v)
 976 {
 977 }
 978
 979 struct seq_operations cpuinfo_op = {
 980         .start  = c_start,
 981         .next   = c_next,
 982         .stop   = c_stop,
 983         .show   = c_show
 984 };