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 #include <linux/fs.h>
  27
  28 #include <asm/cpu.h>
  29 #include <asm/cputype.h>
  30 #include <asm/elf.h>
  31 #include <asm/procinfo.h>
  32 #include <asm/setup.h>
  33 #include <asm/mach-types.h>
  34 #include <asm/cacheflush.h>
  35 #include <asm/cachetype.h>
  36 #include <asm/tlbflush.h>
  37
  38 #include <asm/mach/arch.h>
  39 #include <asm/mach/irq.h>
  40 #include <asm/mach/time.h>
  41 #include <asm/traps.h>
  42
  43 #include "compat.h"
  44 #include "atags.h"
  45
  46 #ifndef MEM_SIZE
  47 #define MEM_SIZE        (16*1024*1024)
  48 #endif
  49
  50 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  51 char fpe_type[8];
  52
  53 static int __init fpe_setup(char *line)
  54 {
  55         memcpy(fpe_type, line, 8);
  56         return 1;
  57 }
  58
  59 __setup("fpe=", fpe_setup);
  60 #endif
  61
  62 extern void paging_init(struct meminfo *, struct machine_desc *desc);
  63 extern void reboot_setup(char *str);
  64 extern int root_mountflags;
  65 extern void _stext, _text, _etext, __data_start, _edata, _end;
  66
  67 unsigned int processor_id;
  68 EXPORT_SYMBOL(processor_id);
  69 unsigned int __machine_arch_type;
  70 EXPORT_SYMBOL(__machine_arch_type);
  71
  72 unsigned int __atags_pointer __initdata;
  73
  74 unsigned int system_rev;
  75 EXPORT_SYMBOL(system_rev);
  76
  77 unsigned int system_serial_low;
  78 EXPORT_SYMBOL(system_serial_low);
  79
  80 unsigned int system_serial_high;
  81 EXPORT_SYMBOL(system_serial_high);
  82
  83 unsigned int elf_hwcap;
  84 EXPORT_SYMBOL(elf_hwcap);
  85
  86 unsigned long __initdata vmalloc_reserve = 128 << 20;
  87
  88
  89 #ifdef MULTI_CPU
  90 struct processor processor;
  91 #endif
  92 #ifdef MULTI_TLB
  93 struct cpu_tlb_fns cpu_tlb;
  94 #endif
  95 #ifdef MULTI_USER
  96 struct cpu_user_fns cpu_user;
  97 #endif
  98 #ifdef MULTI_CACHE
  99 struct cpu_cache_fns cpu_cache;
 100 #endif
 101 #ifdef CONFIG_OUTER_CACHE
 102 struct outer_cache_fns outer_cache;
 103 #endif
 104
 105 struct stack {
 106         u32 irq[3];
 107         u32 abt[3];
 108         u32 und[3];
 109 } ____cacheline_aligned;
 110
 111 static struct stack stacks[NR_CPUS];
 112
 113 char elf_platform[ELF_PLATFORM_SIZE];
 114 EXPORT_SYMBOL(elf_platform);
 115
 116 unsigned long phys_initrd_start __initdata = 0;
 117 unsigned long phys_initrd_size __initdata = 0;
 118
 119 static struct meminfo meminfo __initdata = { 0, };
 120 static const char *cpu_name;
 121 static const char *machine_name;
 122 static char __initdata command_line[COMMAND_LINE_SIZE];
 123
 124 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 125 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 126 #define ENDIANNESS ((char)endian_test.l)
 127
 128 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 129
 130 /*
 131  * Standard memory resources
 132  */
 133 static struct resource mem_res[] = {
 134         {
 135                 .name = "Video RAM",
 136                 .start = 0,
 137                 .end = 0,
 138                 .flags = IORESOURCE_MEM
 139         },
 140         {
 141                 .name = "Kernel text",
 142                 .start = 0,
 143                 .end = 0,
 144                 .flags = IORESOURCE_MEM
 145         },
 146         {
 147                 .name = "Kernel data",
 148                 .start = 0,
 149                 .end = 0,
 150                 .flags = IORESOURCE_MEM
 151         }
 152 };
 153
 154 #define video_ram   mem_res[0]
 155 #define kernel_code mem_res[1]
 156 #define kernel_data mem_res[2]
 157
 158 static struct resource io_res[] = {
 159         {
 160                 .name = "reserved",
 161                 .start = 0x3bc,
 162                 .end = 0x3be,
 163                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 164         },
 165         {
 166                 .name = "reserved",
 167                 .start = 0x378,
 168                 .end = 0x37f,
 169                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 170         },
 171         {
 172                 .name = "reserved",
 173                 .start = 0x278,
 174                 .end = 0x27f,
 175                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 176         }
 177 };
 178
 179 #define lp0 io_res[0]
 180 #define lp1 io_res[1]
 181 #define lp2 io_res[2]
 182
 183 static const char *cache_types[16] = {
 184         "write-through",
 185         "write-back",
 186         "write-back",
 187         "undefined 3",
 188         "undefined 4",
 189         "undefined 5",
 190         "write-back",
 191         "write-back",
 192         "undefined 8",
 193         "undefined 9",
 194         "undefined 10",
 195         "undefined 11",
 196         "undefined 12",
 197         "undefined 13",
 198         "write-back",
 199         "undefined 15",
 200 };
 201
 202 static const char *cache_clean[16] = {
 203         "not required",
 204         "read-block",
 205         "cp15 c7 ops",
 206         "undefined 3",
 207         "undefined 4",
 208         "undefined 5",
 209         "cp15 c7 ops",
 210         "cp15 c7 ops",
 211         "undefined 8",
 212         "undefined 9",
 213         "undefined 10",
 214         "undefined 11",
 215         "undefined 12",
 216         "undefined 13",
 217         "cp15 c7 ops",
 218         "undefined 15",
 219 };
 220
 221 static const char *cache_lockdown[16] = {
 222         "not supported",
 223         "not supported",
 224         "not supported",
 225         "undefined 3",
 226         "undefined 4",
 227         "undefined 5",
 228         "format A",
 229         "format B",
 230         "undefined 8",
 231         "undefined 9",
 232         "undefined 10",
 233         "undefined 11",
 234         "undefined 12",
 235         "undefined 13",
 236         "format C",
 237         "undefined 15",
 238 };
 239
 240 static const char *proc_arch[] = {
 241         "undefined/unknown",
 242         "3",
 243         "4",
 244         "4T",
 245         "5",
 246         "5T",
 247         "5TE",
 248         "5TEJ",
 249         "6TEJ",
 250         "7",
 251         "?(11)",
 252         "?(12)",
 253         "?(13)",
 254         "?(14)",
 255         "?(15)",
 256         "?(16)",
 257         "?(17)",
 258 };
 259
 260 #define CACHE_TYPE(x)   (((x) >> 25) & 15)
 261 #define CACHE_S(x)      ((x) & (1 << 24))
 262 #define CACHE_DSIZE(x)  (((x) >> 12) & 4095)    /* only if S=1 */
 263 #define CACHE_ISIZE(x)  ((x) & 4095)
 264
 265 #define CACHE_SIZE(y)   (((y) >> 6) & 7)
 266 #define CACHE_ASSOC(y)  (((y) >> 3) & 7)
 267 #define CACHE_M(y)      ((y) & (1 << 2))
 268 #define CACHE_LINE(y)   ((y) & 3)
 269
 270 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
 271 {
 272         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 273
 274         printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
 275                 cpu, prefix,
 276                 mult << (8 + CACHE_SIZE(cache)),
 277                 (mult << CACHE_ASSOC(cache)) >> 1,
 278                 8 << CACHE_LINE(cache),
 279                 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 280                         CACHE_LINE(cache)));
 281 }
 282
 283 static void __init dump_cpu_info(int cpu)
 284 {
 285         unsigned int info = read_cpuid_cachetype();
 286
 287         if (info != read_cpuid_id()) {
 288                 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
 289                        cache_types[CACHE_TYPE(info)]);
 290                 if (CACHE_S(info)) {
 291                         dump_cache("I cache", cpu, CACHE_ISIZE(info));
 292                         dump_cache("D cache", cpu, CACHE_DSIZE(info));
 293                 } else {
 294                         dump_cache("cache", cpu, CACHE_ISIZE(info));
 295                 }
 296         }
 297
 298         if (arch_is_coherent())
 299                 printk("Cache coherency enabled\n");
 300 }
 301
 302 int cpu_architecture(void)
 303 {
 304         int cpu_arch;
 305
 306         if ((read_cpuid_id() & 0x0008f000) == 0) {
 307                 cpu_arch = CPU_ARCH_UNKNOWN;
 308         } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 309                 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 310         } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
 311                 cpu_arch = (read_cpuid_id() >> 16) & 7;
 312                 if (cpu_arch)
 313                         cpu_arch += CPU_ARCH_ARMv3;
 314         } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
 315                 unsigned int mmfr0;
 316
 317                 /* Revised CPUID format. Read the Memory Model Feature
 318                  * Register 0 and check for VMSAv7 or PMSAv7 */
 319                 asm("mrc        p15, 0, %0, c0, c1, 4"
 320                     : "=r" (mmfr0));
 321                 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
 322                     (mmfr0 & 0x000000f0) == 0x00000030)
 323                         cpu_arch = CPU_ARCH_ARMv7;
 324                 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
 325                          (mmfr0 & 0x000000f0) == 0x00000020)
 326                         cpu_arch = CPU_ARCH_ARMv6;
 327                 else
 328                         cpu_arch = CPU_ARCH_UNKNOWN;
 329         } else
 330                 cpu_arch = CPU_ARCH_UNKNOWN;
 331
 332         return cpu_arch;
 333 }
 334
 335 /*
 336  * These functions re-use the assembly code in head.S, which
 337  * already provide the required functionality.
 338  */
 339 extern struct proc_info_list *lookup_processor_type(unsigned int);
 340 extern struct machine_desc *lookup_machine_type(unsigned int);
 341
 342 static void __init setup_processor(void)
 343 {
 344         struct proc_info_list *list;
 345
 346         /*
 347          * locate processor in the list of supported processor
 348          * types.  The linker builds this table for us from the
 349          * entries in arch/arm/mm/proc-*.S
 350          */
 351         list = lookup_processor_type(read_cpuid_id());
 352         if (!list) {
 353                 printk("CPU configuration botched (ID %08x), unable "
 354                        "to continue.\n", read_cpuid_id());
 355                 while (1);
 356         }
 357
 358         cpu_name = list->cpu_name;
 359
 360 #ifdef MULTI_CPU
 361         processor = *list->proc;
 362 #endif
 363 #ifdef MULTI_TLB
 364         cpu_tlb = *list->tlb;
 365 #endif
 366 #ifdef MULTI_USER
 367         cpu_user = *list->user;
 368 #endif
 369 #ifdef MULTI_CACHE
 370         cpu_cache = *list->cache;
 371 #endif
 372
 373         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 374                cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
 375                proc_arch[cpu_architecture()], cr_alignment);
 376
 377         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 378         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 379         elf_hwcap = list->elf_hwcap;
 380 #ifndef CONFIG_ARM_THUMB
 381         elf_hwcap &= ~HWCAP_THUMB;
 382 #endif
 383
 384         cpu_proc_init();
 385 }
 386
 387 /*
 388  * cpu_init - initialise one CPU.
 389  *
 390  * cpu_init dumps the cache information, initialises SMP specific
 391  * information, and sets up the per-CPU stacks.
 392  */
 393 void cpu_init(void)
 394 {
 395         unsigned int cpu = smp_processor_id();
 396         struct stack *stk = &stacks[cpu];
 397
 398         if (cpu >= NR_CPUS) {
 399                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 400                 BUG();
 401         }
 402
 403         if (system_state == SYSTEM_BOOTING)
 404                 dump_cpu_info(cpu);
 405
 406         /*
 407          * setup stacks for re-entrant exception handlers
 408          */
 409         __asm__ (
 410         "msr    cpsr_c, %1\n\t"
 411         "add    sp, %0, %2\n\t"
 412         "msr    cpsr_c, %3\n\t"
 413         "add    sp, %0, %4\n\t"
 414         "msr    cpsr_c, %5\n\t"
 415         "add    sp, %0, %6\n\t"
 416         "msr    cpsr_c, %7"
 417             :
 418             : "r" (stk),
 419               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 420               "I" (offsetof(struct stack, irq[0])),
 421               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 422               "I" (offsetof(struct stack, abt[0])),
 423               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 424               "I" (offsetof(struct stack, und[0])),
 425               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 426             : "r14");
 427 }
 428
 429 static struct machine_desc * __init setup_machine(unsigned int nr)
 430 {
 431         struct machine_desc *list;
 432
 433         /*
 434          * locate machine in the list of supported machines.
 435          */
 436         list = lookup_machine_type(nr);
 437         if (!list) {
 438                 printk("Machine configuration botched (nr %d), unable "
 439                        "to continue.\n", nr);
 440                 while (1);
 441         }
 442
 443         printk("Machine: %s\n", list->name);
 444
 445         return list;
 446 }
 447
 448 static void __init early_initrd(char **p)
 449 {
 450         unsigned long start, size;
 451
 452         start = memparse(*p, p);
 453         if (**p == ',') {
 454                 size = memparse((*p) + 1, p);
 455
 456                 phys_initrd_start = start;
 457                 phys_initrd_size = size;
 458         }
 459 }
 460 __early_param("initrd=", early_initrd);
 461
 462 static void __init arm_add_memory(unsigned long start, unsigned long size)
 463 {
 464         struct membank *bank;
 465
 466         /*
 467          * Ensure that start/size are aligned to a page boundary.
 468          * Size is appropriately rounded down, start is rounded up.
 469          */
 470         size -= start & ~PAGE_MASK;
 471
 472         bank = &meminfo.bank[meminfo.nr_banks++];
 473
 474         bank->start = PAGE_ALIGN(start);
 475         bank->size  = size & PAGE_MASK;
 476         bank->node  = PHYS_TO_NID(start);
 477 }
 478
 479 /*
 480  * Pick out the memory size.  We look for mem=size@start,
 481  * where start and size are "size[KkMm]"
 482  */
 483 static void __init early_mem(char **p)
 484 {
 485         static int usermem __initdata = 0;
 486         unsigned long size, start;
 487
 488         /*
 489          * If the user specifies memory size, we
 490          * blow away any automatically generated
 491          * size.
 492          */
 493         if (usermem == 0) {
 494                 usermem = 1;
 495                 meminfo.nr_banks = 0;
 496         }
 497
 498         start = PHYS_OFFSET;
 499         size  = memparse(*p, p);
 500         if (**p == '@')
 501                 start = memparse(*p + 1, p);
 502
 503         arm_add_memory(start, size);
 504 }
 505 __early_param("mem=", early_mem);
 506
 507 /*
 508  * vmalloc=size forces the vmalloc area to be exactly 'size'
 509  * bytes. This can be used to increase (or decrease) the vmalloc
 510  * area - the default is 128m.
 511  */
 512 static void __init early_vmalloc(char **arg)
 513 {
 514         vmalloc_reserve = memparse(*arg, arg);
 515 }
 516 __early_param("vmalloc=", early_vmalloc);
 517
 518 /*
 519  * Initial parsing of the command line.
 520  */
 521 static void __init parse_cmdline(char **cmdline_p, char *from)
 522 {
 523         char c = ' ', *to = command_line;
 524         int len = 0;
 525
 526         for (;;) {
 527                 if (c == ' ') {
 528                         extern struct early_params __early_begin, __early_end;
 529                         struct early_params *p;
 530
 531                         for (p = &__early_begin; p < &__early_end; p++) {
 532                                 int len = strlen(p->arg);
 533
 534                                 if (memcmp(from, p->arg, len) == 0) {
 535                                         if (to != command_line)
 536                                                 to -= 1;
 537                                         from += len;
 538                                         p->fn(&from);
 539
 540                                         while (*from != ' ' && *from != '\0')
 541                                                 from++;
 542                                         break;
 543                                 }
 544                         }
 545                 }
 546                 c = *from++;
 547                 if (!c)
 548                         break;
 549                 if (COMMAND_LINE_SIZE <= ++len)
 550                         break;
 551                 *to++ = c;
 552         }
 553         *to = '\0';
 554         *cmdline_p = command_line;
 555 }
 556
 557 static void __init
 558 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 559 {
 560 #ifdef CONFIG_BLK_DEV_RAM
 561         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 562
 563         rd_image_start = image_start;
 564         rd_prompt = prompt;
 565         rd_doload = doload;
 566
 567         if (rd_sz)
 568                 rd_size = rd_sz;
 569 #endif
 570 }
 571
 572 static void __init
 573 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
 574 {
 575         struct resource *res;
 576         int i;
 577
 578         kernel_code.start   = virt_to_phys(&_text);
 579         kernel_code.end     = virt_to_phys(&_etext - 1);
 580         kernel_data.start   = virt_to_phys(&__data_start);
 581         kernel_data.end     = virt_to_phys(&_end - 1);
 582
 583         for (i = 0; i < mi->nr_banks; i++) {
 584                 unsigned long virt_start, virt_end;
 585
 586                 if (mi->bank[i].size == 0)
 587                         continue;
 588
 589                 virt_start = __phys_to_virt(mi->bank[i].start);
 590                 virt_end   = virt_start + mi->bank[i].size - 1;
 591
 592                 res = alloc_bootmem_low(sizeof(*res));
 593                 res->name  = "System RAM";
 594                 res->start = __virt_to_phys(virt_start);
 595                 res->end   = __virt_to_phys(virt_end);
 596                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 597
 598                 request_resource(&iomem_resource, res);
 599
 600                 if (kernel_code.start >= res->start &&
 601                     kernel_code.end <= res->end)
 602                         request_resource(res, &kernel_code);
 603                 if (kernel_data.start >= res->start &&
 604                     kernel_data.end <= res->end)
 605                         request_resource(res, &kernel_data);
 606         }
 607
 608         if (mdesc->video_start) {
 609                 video_ram.start = mdesc->video_start;
 610                 video_ram.end   = mdesc->video_end;
 611                 request_resource(&iomem_resource, &video_ram);
 612         }
 613
 614         /*
 615          * Some machines don't have the possibility of ever
 616          * possessing lp0, lp1 or lp2
 617          */
 618         if (mdesc->reserve_lp0)
 619                 request_resource(&ioport_resource, &lp0);
 620         if (mdesc->reserve_lp1)
 621                 request_resource(&ioport_resource, &lp1);
 622         if (mdesc->reserve_lp2)
 623                 request_resource(&ioport_resource, &lp2);
 624 }
 625
 626 /*
 627  *  Tag parsing.
 628  *
 629  * This is the new way of passing data to the kernel at boot time.  Rather
 630  * than passing a fixed inflexible structure to the kernel, we pass a list
 631  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 632  * tag for the list to be recognised (to distinguish the tagged list from
 633  * a param_struct).  The list is terminated with a zero-length tag (this tag
 634  * is not parsed in any way).
 635  */
 636 static int __init parse_tag_core(const struct tag *tag)
 637 {
 638         if (tag->hdr.size > 2) {
 639                 if ((tag->u.core.flags & 1) == 0)
 640                         root_mountflags &= ~MS_RDONLY;
 641                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 642         }
 643         return 0;
 644 }
 645
 646 __tagtable(ATAG_CORE, parse_tag_core);
 647
 648 static int __init parse_tag_mem32(const struct tag *tag)
 649 {
 650         if (meminfo.nr_banks >= NR_BANKS) {
 651                 printk(KERN_WARNING
 652                        "Ignoring memory bank 0x%08x size %dKB\n",
 653                         tag->u.mem.start, tag->u.mem.size / 1024);
 654                 return -EINVAL;
 655         }
 656         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 657         return 0;
 658 }
 659
 660 __tagtable(ATAG_MEM, parse_tag_mem32);
 661
 662 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 663 struct screen_info screen_info = {
 664  .orig_video_lines      = 30,
 665  .orig_video_cols       = 80,
 666  .orig_video_mode       = 0,
 667  .orig_video_ega_bx     = 0,
 668  .orig_video_isVGA      = 1,
 669  .orig_video_points     = 8
 670 };
 671
 672 static int __init parse_tag_videotext(const struct tag *tag)
 673 {
 674         screen_info.orig_x            = tag->u.videotext.x;
 675         screen_info.orig_y            = tag->u.videotext.y;
 676         screen_info.orig_video_page   = tag->u.videotext.video_page;
 677         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 678         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 679         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 680         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 681         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 682         screen_info.orig_video_points = tag->u.videotext.video_points;
 683         return 0;
 684 }
 685
 686 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 687 #endif
 688
 689 static int __init parse_tag_ramdisk(const struct tag *tag)
 690 {
 691         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 692                       (tag->u.ramdisk.flags & 2) == 0,
 693                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 694         return 0;
 695 }
 696
 697 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 698
 699 static int __init parse_tag_initrd(const struct tag *tag)
 700 {
 701         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
 702                 "please update your bootloader.\n");
 703         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
 704         phys_initrd_size = tag->u.initrd.size;
 705         return 0;
 706 }
 707
 708 __tagtable(ATAG_INITRD, parse_tag_initrd);
 709
 710 static int __init parse_tag_initrd2(const struct tag *tag)
 711 {
 712         phys_initrd_start = tag->u.initrd.start;
 713         phys_initrd_size = tag->u.initrd.size;
 714         return 0;
 715 }
 716
 717 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 718
 719 static int __init parse_tag_serialnr(const struct tag *tag)
 720 {
 721         system_serial_low = tag->u.serialnr.low;
 722         system_serial_high = tag->u.serialnr.high;
 723         return 0;
 724 }
 725
 726 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 727
 728 static int __init parse_tag_revision(const struct tag *tag)
 729 {
 730         system_rev = tag->u.revision.rev;
 731         return 0;
 732 }
 733
 734 __tagtable(ATAG_REVISION, parse_tag_revision);
 735
 736 static int __init parse_tag_cmdline(const struct tag *tag)
 737 {
 738         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 739         return 0;
 740 }
 741
 742 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 743
 744 /*
 745  * Scan the tag table for this tag, and call its parse function.
 746  * The tag table is built by the linker from all the __tagtable
 747  * declarations.
 748  */
 749 static int __init parse_tag(const struct tag *tag)
 750 {
 751         extern struct tagtable __tagtable_begin, __tagtable_end;
 752         struct tagtable *t;
 753
 754         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 755                 if (tag->hdr.tag == t->tag) {
 756                         t->parse(tag);
 757                         break;
 758                 }
 759
 760         return t < &__tagtable_end;
 761 }
 762
 763 /*
 764  * Parse all tags in the list, checking both the global and architecture
 765  * specific tag tables.
 766  */
 767 static void __init parse_tags(const struct tag *t)
 768 {
 769         for (; t->hdr.size; t = tag_next(t))
 770                 if (!parse_tag(t))
 771                         printk(KERN_WARNING
 772                                 "Ignoring unrecognised tag 0x%08x\n",
 773                                 t->hdr.tag);
 774 }
 775
 776 /*
 777  * This holds our defaults.
 778  */
 779 static struct init_tags {
 780         struct tag_header hdr1;
 781         struct tag_core   core;
 782         struct tag_header hdr2;
 783         struct tag_mem32  mem;
 784         struct tag_header hdr3;
 785 } init_tags __initdata = {
 786         { tag_size(tag_core), ATAG_CORE },
 787         { 1, PAGE_SIZE, 0xff },
 788         { tag_size(tag_mem32), ATAG_MEM },
 789         { MEM_SIZE, PHYS_OFFSET },
 790         { 0, ATAG_NONE }
 791 };
 792
 793 static void (*init_machine)(void) __initdata;
 794
 795 static int __init customize_machine(void)
 796 {
 797         /* customizes platform devices, or adds new ones */
 798         if (init_machine)
 799                 init_machine();
 800         return 0;
 801 }
 802 arch_initcall(customize_machine);
 803
 804 void __init setup_arch(char **cmdline_p)
 805 {
 806         struct tag *tags = (struct tag *)&init_tags;
 807         struct machine_desc *mdesc;
 808         char *from = default_command_line;
 809
 810         setup_processor();
 811         mdesc = setup_machine(machine_arch_type);
 812         machine_name = mdesc->name;
 813
 814         if (mdesc->soft_reboot)
 815                 reboot_setup("s");
 816
 817         if (__atags_pointer)
 818                 tags = phys_to_virt(__atags_pointer);
 819         else if (mdesc->boot_params)
 820                 tags = phys_to_virt(mdesc->boot_params);
 821
 822         /*
 823          * If we have the old style parameters, convert them to
 824          * a tag list.
 825          */
 826         if (tags->hdr.tag != ATAG_CORE)
 827                 convert_to_tag_list(tags);
 828         if (tags->hdr.tag != ATAG_CORE)
 829                 tags = (struct tag *)&init_tags;
 830
 831         if (mdesc->fixup)
 832                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 833
 834         if (tags->hdr.tag == ATAG_CORE) {
 835                 if (meminfo.nr_banks != 0)
 836                         squash_mem_tags(tags);
 837                 save_atags(tags);
 838                 parse_tags(tags);
 839         }
 840
 841         init_mm.start_code = (unsigned long) &_text;
 842         init_mm.end_code   = (unsigned long) &_etext;
 843         init_mm.end_data   = (unsigned long) &_edata;
 844         init_mm.brk        = (unsigned long) &_end;
 845
 846         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 847         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 848         parse_cmdline(cmdline_p, from);
 849         paging_init(&meminfo, mdesc);
 850         request_standard_resources(&meminfo, mdesc);
 851
 852 #ifdef CONFIG_SMP
 853         smp_init_cpus();
 854 #endif
 855
 856         cpu_init();
 857
 858         /*
 859          * Set up various architecture-specific pointers
 860          */
 861         init_arch_irq = mdesc->init_irq;
 862         system_timer = mdesc->timer;
 863         init_machine = mdesc->init_machine;
 864
 865 #ifdef CONFIG_VT
 866 #if defined(CONFIG_VGA_CONSOLE)
 867         conswitchp = &vga_con;
 868 #elif defined(CONFIG_DUMMY_CONSOLE)
 869         conswitchp = &dummy_con;
 870 #endif
 871 #endif
 872         early_trap_init();
 873 }
 874
 875
 876 static int __init topology_init(void)
 877 {
 878         int cpu;
 879
 880         for_each_possible_cpu(cpu) {
 881                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 882                 cpuinfo->cpu.hotpluggable = 1;
 883                 register_cpu(&cpuinfo->cpu, cpu);
 884         }
 885
 886         return 0;
 887 }
 888
 889 subsys_initcall(topology_init);
 890
 891 static const char *hwcap_str[] = {
 892         "swp",
 893         "half",
 894         "thumb",
 895         "26bit",
 896         "fastmult",
 897         "fpa",
 898         "vfp",
 899         "edsp",
 900         "java",
 901         "iwmmxt",
 902         "crunch",
 903         NULL
 904 };
 905
 906 static void
 907 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
 908 {
 909         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 910
 911         seq_printf(m, "%s size\t\t: %d\n"
 912                       "%s assoc\t\t: %d\n"
 913                       "%s line length\t: %d\n"
 914                       "%s sets\t\t: %d\n",
 915                 type, mult << (8 + CACHE_SIZE(cache)),
 916                 type, (mult << CACHE_ASSOC(cache)) >> 1,
 917                 type, 8 << CACHE_LINE(cache),
 918                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 919                             CACHE_LINE(cache)));
 920 }
 921
 922 static int c_show(struct seq_file *m, void *v)
 923 {
 924         int i;
 925
 926         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 927                    cpu_name, read_cpuid_id() & 15, elf_platform);
 928
 929 #if defined(CONFIG_SMP)
 930         for_each_online_cpu(i) {
 931                 /*
 932                  * glibc reads /proc/cpuinfo to determine the number of
 933                  * online processors, looking for lines beginning with
 934                  * "processor".  Give glibc what it expects.
 935                  */
 936                 seq_printf(m, "processor\t: %d\n", i);
 937                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 938                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 939                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 940         }
 941 #else /* CONFIG_SMP */
 942         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 943                    loops_per_jiffy / (500000/HZ),
 944                    (loops_per_jiffy / (5000/HZ)) % 100);
 945 #endif
 946
 947         /* dump out the processor features */
 948         seq_puts(m, "Features\t: ");
 949
 950         for (i = 0; hwcap_str[i]; i++)
 951                 if (elf_hwcap & (1 << i))
 952                         seq_printf(m, "%s ", hwcap_str[i]);
 953
 954         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 955         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 956
 957         if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
 958                 /* pre-ARM7 */
 959                 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
 960         } else {
 961                 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 962                         /* ARM7 */
 963                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 964                                    (read_cpuid_id() >> 16) & 127);
 965                 } else {
 966                         /* post-ARM7 */
 967                         seq_printf(m, "CPU variant\t: 0x%x\n",
 968                                    (read_cpuid_id() >> 20) & 15);
 969                 }
 970                 seq_printf(m, "CPU part\t: 0x%03x\n",
 971                            (read_cpuid_id() >> 4) & 0xfff);
 972         }
 973         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 974
 975         {
 976                 unsigned int cache_info = read_cpuid_cachetype();
 977                 if (cache_info != read_cpuid_id()) {
 978                         seq_printf(m, "Cache type\t: %s\n"
 979                                       "Cache clean\t: %s\n"
 980                                       "Cache lockdown\t: %s\n"
 981                                       "Cache format\t: %s\n",
 982                                    cache_types[CACHE_TYPE(cache_info)],
 983                                    cache_clean[CACHE_TYPE(cache_info)],
 984                                    cache_lockdown[CACHE_TYPE(cache_info)],
 985                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
 986
 987                         if (CACHE_S(cache_info)) {
 988                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
 989                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
 990                         } else {
 991                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
 992                         }
 993                 }
 994         }
 995
 996         seq_puts(m, "\n");
 997
 998         seq_printf(m, "Hardware\t: %s\n", machine_name);
 999         seq_printf(m, "Revision\t: %04x\n", system_rev);
1000         seq_printf(m, "Serial\t\t: %08x%08x\n",
1001                    system_serial_high, system_serial_low);
1002
1003         return 0;
1004 }
1005
1006 static void *c_start(struct seq_file *m, loff_t *pos)
1007 {
1008         return *pos < 1 ? (void *)1 : NULL;
1009 }
1010
1011 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1012 {
1013         ++*pos;
1014         return NULL;
1015 }
1016
1017 static void c_stop(struct seq_file *m, void *v)
1018 {
1019 }
1020
1021 const struct seq_operations cpuinfo_op = {
1022         .start  = c_start,
1023         .next   = c_next,
1024         .stop   = c_stop,
1025         .show   = c_show
1026 };