git.oblomov.eu Git - linux-2.6/blob - 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/elf.h>
  30 #include <asm/procinfo.h>
  31 #include <asm/setup.h>
  32 #include <asm/mach-types.h>
  33 #include <asm/cacheflush.h>
  34 #include <asm/tlbflush.h>
  35
  36 #include <asm/mach/arch.h>
  37 #include <asm/mach/irq.h>
  38 #include <asm/mach/time.h>
  39
  40 #include "compat.h"
  41
  42 #ifndef MEM_SIZE
  43 #define MEM_SIZE        (16*1024*1024)
  44 #endif
  45
  46 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  47 char fpe_type[8];
  48
  49 static int __init fpe_setup(char *line)
  50 {
  51         memcpy(fpe_type, line, 8);
  52         return 1;
  53 }
  54
  55 __setup("fpe=", fpe_setup);
  56 #endif
  57
  58 extern void paging_init(struct meminfo *, struct machine_desc *desc);
  59 extern void reboot_setup(char *str);
  60 extern int root_mountflags;
  61 extern void _stext, _text, _etext, __data_start, _edata, _end;
  62
  63 unsigned int processor_id;
  64 unsigned int __machine_arch_type;
  65 EXPORT_SYMBOL(__machine_arch_type);
  66
  67 unsigned int __atags_pointer __initdata;
  68
  69 unsigned int system_rev;
  70 EXPORT_SYMBOL(system_rev);
  71
  72 unsigned int system_serial_low;
  73 EXPORT_SYMBOL(system_serial_low);
  74
  75 unsigned int system_serial_high;
  76 EXPORT_SYMBOL(system_serial_high);
  77
  78 unsigned int elf_hwcap;
  79 EXPORT_SYMBOL(elf_hwcap);
  80
  81
  82 #ifdef MULTI_CPU
  83 struct processor processor;
  84 #endif
  85 #ifdef MULTI_TLB
  86 struct cpu_tlb_fns cpu_tlb;
  87 #endif
  88 #ifdef MULTI_USER
  89 struct cpu_user_fns cpu_user;
  90 #endif
  91 #ifdef MULTI_CACHE
  92 struct cpu_cache_fns cpu_cache;
  93 #endif
  94 #ifdef CONFIG_OUTER_CACHE
  95 struct outer_cache_fns outer_cache;
  96 #endif
  97
  98 struct stack {
  99         u32 irq[3];
 100         u32 abt[3];
 101         u32 und[3];
 102 } ____cacheline_aligned;
 103
 104 static struct stack stacks[NR_CPUS];
 105
 106 char elf_platform[ELF_PLATFORM_SIZE];
 107 EXPORT_SYMBOL(elf_platform);
 108
 109 unsigned long phys_initrd_start __initdata = 0;
 110 unsigned long phys_initrd_size __initdata = 0;
 111
 112 static struct meminfo meminfo __initdata = { 0, };
 113 static const char *cpu_name;
 114 static const char *machine_name;
 115 static char __initdata command_line[COMMAND_LINE_SIZE];
 116
 117 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 118 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 119 #define ENDIANNESS ((char)endian_test.l)
 120
 121 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 122
 123 /*
 124  * Standard memory resources
 125  */
 126 static struct resource mem_res[] = {
 127         {
 128                 .name = "Video RAM",
 129                 .start = 0,
 130                 .end = 0,
 131                 .flags = IORESOURCE_MEM
 132         },
 133         {
 134                 .name = "Kernel text",
 135                 .start = 0,
 136                 .end = 0,
 137                 .flags = IORESOURCE_MEM
 138         },
 139         {
 140                 .name = "Kernel data",
 141                 .start = 0,
 142                 .end = 0,
 143                 .flags = IORESOURCE_MEM
 144         }
 145 };
 146
 147 #define video_ram   mem_res[0]
 148 #define kernel_code mem_res[1]
 149 #define kernel_data mem_res[2]
 150
 151 static struct resource io_res[] = {
 152         {
 153                 .name = "reserved",
 154                 .start = 0x3bc,
 155                 .end = 0x3be,
 156                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 157         },
 158         {
 159                 .name = "reserved",
 160                 .start = 0x378,
 161                 .end = 0x37f,
 162                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 163         },
 164         {
 165                 .name = "reserved",
 166                 .start = 0x278,
 167                 .end = 0x27f,
 168                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 169         }
 170 };
 171
 172 #define lp0 io_res[0]
 173 #define lp1 io_res[1]
 174 #define lp2 io_res[2]
 175
 176 static const char *cache_types[16] = {
 177         "write-through",
 178         "write-back",
 179         "write-back",
 180         "undefined 3",
 181         "undefined 4",
 182         "undefined 5",
 183         "write-back",
 184         "write-back",
 185         "undefined 8",
 186         "undefined 9",
 187         "undefined 10",
 188         "undefined 11",
 189         "undefined 12",
 190         "undefined 13",
 191         "write-back",
 192         "undefined 15",
 193 };
 194
 195 static const char *cache_clean[16] = {
 196         "not required",
 197         "read-block",
 198         "cp15 c7 ops",
 199         "undefined 3",
 200         "undefined 4",
 201         "undefined 5",
 202         "cp15 c7 ops",
 203         "cp15 c7 ops",
 204         "undefined 8",
 205         "undefined 9",
 206         "undefined 10",
 207         "undefined 11",
 208         "undefined 12",
 209         "undefined 13",
 210         "cp15 c7 ops",
 211         "undefined 15",
 212 };
 213
 214 static const char *cache_lockdown[16] = {
 215         "not supported",
 216         "not supported",
 217         "not supported",
 218         "undefined 3",
 219         "undefined 4",
 220         "undefined 5",
 221         "format A",
 222         "format B",
 223         "undefined 8",
 224         "undefined 9",
 225         "undefined 10",
 226         "undefined 11",
 227         "undefined 12",
 228         "undefined 13",
 229         "format C",
 230         "undefined 15",
 231 };
 232
 233 static const char *proc_arch[] = {
 234         "undefined/unknown",
 235         "3",
 236         "4",
 237         "4T",
 238         "5",
 239         "5T",
 240         "5TE",
 241         "5TEJ",
 242         "6TEJ",
 243         "7",
 244         "?(11)",
 245         "?(12)",
 246         "?(13)",
 247         "?(14)",
 248         "?(15)",
 249         "?(16)",
 250         "?(17)",
 251 };
 252
 253 #define CACHE_TYPE(x)   (((x) >> 25) & 15)
 254 #define CACHE_S(x)      ((x) & (1 << 24))
 255 #define CACHE_DSIZE(x)  (((x) >> 12) & 4095)    /* only if S=1 */
 256 #define CACHE_ISIZE(x)  ((x) & 4095)
 257
 258 #define CACHE_SIZE(y)   (((y) >> 6) & 7)
 259 #define CACHE_ASSOC(y)  (((y) >> 3) & 7)
 260 #define CACHE_M(y)      ((y) & (1 << 2))
 261 #define CACHE_LINE(y)   ((y) & 3)
 262
 263 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
 264 {
 265         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 266
 267         printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
 268                 cpu, prefix,
 269                 mult << (8 + CACHE_SIZE(cache)),
 270                 (mult << CACHE_ASSOC(cache)) >> 1,
 271                 8 << CACHE_LINE(cache),
 272                 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 273                         CACHE_LINE(cache)));
 274 }
 275
 276 static void __init dump_cpu_info(int cpu)
 277 {
 278         unsigned int info = read_cpuid(CPUID_CACHETYPE);
 279
 280         if (info != processor_id) {
 281                 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
 282                        cache_types[CACHE_TYPE(info)]);
 283                 if (CACHE_S(info)) {
 284                         dump_cache("I cache", cpu, CACHE_ISIZE(info));
 285                         dump_cache("D cache", cpu, CACHE_DSIZE(info));
 286                 } else {
 287                         dump_cache("cache", cpu, CACHE_ISIZE(info));
 288                 }
 289         }
 290
 291         if (arch_is_coherent())
 292                 printk("Cache coherency enabled\n");
 293 }
 294
 295 int cpu_architecture(void)
 296 {
 297         int cpu_arch;
 298
 299         if ((processor_id & 0x0008f000) == 0) {
 300                 cpu_arch = CPU_ARCH_UNKNOWN;
 301         } else if ((processor_id & 0x0008f000) == 0x00007000) {
 302                 cpu_arch = (processor_id & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 303         } else if ((processor_id & 0x00080000) == 0x00000000) {
 304                 cpu_arch = (processor_id >> 16) & 7;
 305                 if (cpu_arch)
 306                         cpu_arch += CPU_ARCH_ARMv3;
 307         } else {
 308                 /* the revised CPUID */
 309                 cpu_arch = ((processor_id >> 12) & 0xf) - 0xb + CPU_ARCH_ARMv6;
 310         }
 311
 312         return cpu_arch;
 313 }
 314
 315 /*
 316  * These functions re-use the assembly code in head.S, which
 317  * already provide the required functionality.
 318  */
 319 extern struct proc_info_list *lookup_processor_type(unsigned int);
 320 extern struct machine_desc *lookup_machine_type(unsigned int);
 321
 322 static void __init setup_processor(void)
 323 {
 324         struct proc_info_list *list;
 325
 326         /*
 327          * locate processor in the list of supported processor
 328          * types.  The linker builds this table for us from the
 329          * entries in arch/arm/mm/proc-*.S
 330          */
 331         list = lookup_processor_type(processor_id);
 332         if (!list) {
 333                 printk("CPU configuration botched (ID %08x), unable "
 334                        "to continue.\n", processor_id);
 335                 while (1);
 336         }
 337
 338         cpu_name = list->cpu_name;
 339
 340 #ifdef MULTI_CPU
 341         processor = *list->proc;
 342 #endif
 343 #ifdef MULTI_TLB
 344         cpu_tlb = *list->tlb;
 345 #endif
 346 #ifdef MULTI_USER
 347         cpu_user = *list->user;
 348 #endif
 349 #ifdef MULTI_CACHE
 350         cpu_cache = *list->cache;
 351 #endif
 352
 353         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 354                cpu_name, processor_id, (int)processor_id & 15,
 355                proc_arch[cpu_architecture()], cr_alignment);
 356
 357         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 358         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 359         elf_hwcap = list->elf_hwcap;
 360 #ifndef CONFIG_ARM_THUMB
 361         elf_hwcap &= ~HWCAP_THUMB;
 362 #endif
 363
 364         cpu_proc_init();
 365 }
 366
 367 /*
 368  * cpu_init - initialise one CPU.
 369  *
 370  * cpu_init dumps the cache information, initialises SMP specific
 371  * information, and sets up the per-CPU stacks.
 372  */
 373 void cpu_init(void)
 374 {
 375         unsigned int cpu = smp_processor_id();
 376         struct stack *stk = &stacks[cpu];
 377
 378         if (cpu >= NR_CPUS) {
 379                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 380                 BUG();
 381         }
 382
 383         if (system_state == SYSTEM_BOOTING)
 384                 dump_cpu_info(cpu);
 385
 386         /*
 387          * setup stacks for re-entrant exception handlers
 388          */
 389         __asm__ (
 390         "msr    cpsr_c, %1\n\t"
 391         "add    sp, %0, %2\n\t"
 392         "msr    cpsr_c, %3\n\t"
 393         "add    sp, %0, %4\n\t"
 394         "msr    cpsr_c, %5\n\t"
 395         "add    sp, %0, %6\n\t"
 396         "msr    cpsr_c, %7"
 397             :
 398             : "r" (stk),
 399               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 400               "I" (offsetof(struct stack, irq[0])),
 401               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 402               "I" (offsetof(struct stack, abt[0])),
 403               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 404               "I" (offsetof(struct stack, und[0])),
 405               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 406             : "r14");
 407 }
 408
 409 static struct machine_desc * __init setup_machine(unsigned int nr)
 410 {
 411         struct machine_desc *list;
 412
 413         /*
 414          * locate machine in the list of supported machines.
 415          */
 416         list = lookup_machine_type(nr);
 417         if (!list) {
 418                 printk("Machine configuration botched (nr %d), unable "
 419                        "to continue.\n", nr);
 420                 while (1);
 421         }
 422
 423         printk("Machine: %s\n", list->name);
 424
 425         return list;
 426 }
 427
 428 static void __init early_initrd(char **p)
 429 {
 430         unsigned long start, size;
 431
 432         start = memparse(*p, p);
 433         if (**p == ',') {
 434                 size = memparse((*p) + 1, p);
 435
 436                 phys_initrd_start = start;
 437                 phys_initrd_size = size;
 438         }
 439 }
 440 __early_param("initrd=", early_initrd);
 441
 442 static void __init arm_add_memory(unsigned long start, unsigned long size)
 443 {
 444         struct membank *bank;
 445
 446         /*
 447          * Ensure that start/size are aligned to a page boundary.
 448          * Size is appropriately rounded down, start is rounded up.
 449          */
 450         size -= start & ~PAGE_MASK;
 451
 452         bank = &meminfo.bank[meminfo.nr_banks++];
 453
 454         bank->start = PAGE_ALIGN(start);
 455         bank->size  = size & PAGE_MASK;
 456         bank->node  = PHYS_TO_NID(start);
 457 }
 458
 459 /*
 460  * Pick out the memory size.  We look for mem=size@start,
 461  * where start and size are "size[KkMm]"
 462  */
 463 static void __init early_mem(char **p)
 464 {
 465         static int usermem __initdata = 0;
 466         unsigned long size, start;
 467
 468         /*
 469          * If the user specifies memory size, we
 470          * blow away any automatically generated
 471          * size.
 472          */
 473         if (usermem == 0) {
 474                 usermem = 1;
 475                 meminfo.nr_banks = 0;
 476         }
 477
 478         start = PHYS_OFFSET;
 479         size  = memparse(*p, p);
 480         if (**p == '@')
 481                 start = memparse(*p + 1, p);
 482
 483         arm_add_memory(start, size);
 484 }
 485 __early_param("mem=", early_mem);
 486
 487 /*
 488  * Initial parsing of the command line.
 489  */
 490 static void __init parse_cmdline(char **cmdline_p, char *from)
 491 {
 492         char c = ' ', *to = command_line;
 493         int len = 0;
 494
 495         for (;;) {
 496                 if (c == ' ') {
 497                         extern struct early_params __early_begin, __early_end;
 498                         struct early_params *p;
 499
 500                         for (p = &__early_begin; p < &__early_end; p++) {
 501                                 int len = strlen(p->arg);
 502
 503                                 if (memcmp(from, p->arg, len) == 0) {
 504                                         if (to != command_line)
 505                                                 to -= 1;
 506                                         from += len;
 507                                         p->fn(&from);
 508
 509                                         while (*from != ' ' && *from != '\0')
 510                                                 from++;
 511                                         break;
 512                                 }
 513                         }
 514                 }
 515                 c = *from++;
 516                 if (!c)
 517                         break;
 518                 if (COMMAND_LINE_SIZE <= ++len)
 519                         break;
 520                 *to++ = c;
 521         }
 522         *to = '\0';
 523         *cmdline_p = command_line;
 524 }
 525
 526 static void __init
 527 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 528 {
 529 #ifdef CONFIG_BLK_DEV_RAM
 530         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 531
 532         rd_image_start = image_start;
 533         rd_prompt = prompt;
 534         rd_doload = doload;
 535
 536         if (rd_sz)
 537                 rd_size = rd_sz;
 538 #endif
 539 }
 540
 541 static void __init
 542 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
 543 {
 544         struct resource *res;
 545         int i;
 546
 547         kernel_code.start   = virt_to_phys(&_text);
 548         kernel_code.end     = virt_to_phys(&_etext - 1);
 549         kernel_data.start   = virt_to_phys(&__data_start);
 550         kernel_data.end     = virt_to_phys(&_end - 1);
 551
 552         for (i = 0; i < mi->nr_banks; i++) {
 553                 unsigned long virt_start, virt_end;
 554
 555                 if (mi->bank[i].size == 0)
 556                         continue;
 557
 558                 virt_start = __phys_to_virt(mi->bank[i].start);
 559                 virt_end   = virt_start + mi->bank[i].size - 1;
 560
 561                 res = alloc_bootmem_low(sizeof(*res));
 562                 res->name  = "System RAM";
 563                 res->start = __virt_to_phys(virt_start);
 564                 res->end   = __virt_to_phys(virt_end);
 565                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 566
 567                 request_resource(&iomem_resource, res);
 568
 569                 if (kernel_code.start >= res->start &&
 570                     kernel_code.end <= res->end)
 571                         request_resource(res, &kernel_code);
 572                 if (kernel_data.start >= res->start &&
 573                     kernel_data.end <= res->end)
 574                         request_resource(res, &kernel_data);
 575         }
 576
 577         if (mdesc->video_start) {
 578                 video_ram.start = mdesc->video_start;
 579                 video_ram.end   = mdesc->video_end;
 580                 request_resource(&iomem_resource, &video_ram);
 581         }
 582
 583         /*
 584          * Some machines don't have the possibility of ever
 585          * possessing lp0, lp1 or lp2
 586          */
 587         if (mdesc->reserve_lp0)
 588                 request_resource(&ioport_resource, &lp0);
 589         if (mdesc->reserve_lp1)
 590                 request_resource(&ioport_resource, &lp1);
 591         if (mdesc->reserve_lp2)
 592                 request_resource(&ioport_resource, &lp2);
 593 }
 594
 595 /*
 596  *  Tag parsing.
 597  *
 598  * This is the new way of passing data to the kernel at boot time.  Rather
 599  * than passing a fixed inflexible structure to the kernel, we pass a list
 600  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 601  * tag for the list to be recognised (to distinguish the tagged list from
 602  * a param_struct).  The list is terminated with a zero-length tag (this tag
 603  * is not parsed in any way).
 604  */
 605 static int __init parse_tag_core(const struct tag *tag)
 606 {
 607         if (tag->hdr.size > 2) {
 608                 if ((tag->u.core.flags & 1) == 0)
 609                         root_mountflags &= ~MS_RDONLY;
 610                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 611         }
 612         return 0;
 613 }
 614
 615 __tagtable(ATAG_CORE, parse_tag_core);
 616
 617 static int __init parse_tag_mem32(const struct tag *tag)
 618 {
 619         if (meminfo.nr_banks >= NR_BANKS) {
 620                 printk(KERN_WARNING
 621                        "Ignoring memory bank 0x%08x size %dKB\n",
 622                         tag->u.mem.start, tag->u.mem.size / 1024);
 623                 return -EINVAL;
 624         }
 625         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 626         return 0;
 627 }
 628
 629 __tagtable(ATAG_MEM, parse_tag_mem32);
 630
 631 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 632 struct screen_info screen_info = {
 633  .orig_video_lines      = 30,
 634  .orig_video_cols       = 80,
 635  .orig_video_mode       = 0,
 636  .orig_video_ega_bx     = 0,
 637  .orig_video_isVGA      = 1,
 638  .orig_video_points     = 8
 639 };
 640
 641 static int __init parse_tag_videotext(const struct tag *tag)
 642 {
 643         screen_info.orig_x            = tag->u.videotext.x;
 644         screen_info.orig_y            = tag->u.videotext.y;
 645         screen_info.orig_video_page   = tag->u.videotext.video_page;
 646         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 647         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 648         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 649         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 650         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 651         screen_info.orig_video_points = tag->u.videotext.video_points;
 652         return 0;
 653 }
 654
 655 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 656 #endif
 657
 658 static int __init parse_tag_ramdisk(const struct tag *tag)
 659 {
 660         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 661                       (tag->u.ramdisk.flags & 2) == 0,
 662                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 663         return 0;
 664 }
 665
 666 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 667
 668 static int __init parse_tag_initrd(const struct tag *tag)
 669 {
 670         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
 671                 "please update your bootloader.\n");
 672         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
 673         phys_initrd_size = tag->u.initrd.size;
 674         return 0;
 675 }
 676
 677 __tagtable(ATAG_INITRD, parse_tag_initrd);
 678
 679 static int __init parse_tag_initrd2(const struct tag *tag)
 680 {
 681         phys_initrd_start = tag->u.initrd.start;
 682         phys_initrd_size = tag->u.initrd.size;
 683         return 0;
 684 }
 685
 686 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 687
 688 static int __init parse_tag_serialnr(const struct tag *tag)
 689 {
 690         system_serial_low = tag->u.serialnr.low;
 691         system_serial_high = tag->u.serialnr.high;
 692         return 0;
 693 }
 694
 695 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 696
 697 static int __init parse_tag_revision(const struct tag *tag)
 698 {
 699         system_rev = tag->u.revision.rev;
 700         return 0;
 701 }
 702
 703 __tagtable(ATAG_REVISION, parse_tag_revision);
 704
 705 static int __init parse_tag_cmdline(const struct tag *tag)
 706 {
 707         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 708         return 0;
 709 }
 710
 711 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 712
 713 /*
 714  * Scan the tag table for this tag, and call its parse function.
 715  * The tag table is built by the linker from all the __tagtable
 716  * declarations.
 717  */
 718 static int __init parse_tag(const struct tag *tag)
 719 {
 720         extern struct tagtable __tagtable_begin, __tagtable_end;
 721         struct tagtable *t;
 722
 723         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 724                 if (tag->hdr.tag == t->tag) {
 725                         t->parse(tag);
 726                         break;
 727                 }
 728
 729         return t < &__tagtable_end;
 730 }
 731
 732 /*
 733  * Parse all tags in the list, checking both the global and architecture
 734  * specific tag tables.
 735  */
 736 static void __init parse_tags(const struct tag *t)
 737 {
 738         for (; t->hdr.size; t = tag_next(t))
 739                 if (!parse_tag(t))
 740                         printk(KERN_WARNING
 741                                 "Ignoring unrecognised tag 0x%08x\n",
 742                                 t->hdr.tag);
 743 }
 744
 745 /*
 746  * This holds our defaults.
 747  */
 748 static struct init_tags {
 749         struct tag_header hdr1;
 750         struct tag_core   core;
 751         struct tag_header hdr2;
 752         struct tag_mem32  mem;
 753         struct tag_header hdr3;
 754 } init_tags __initdata = {
 755         { tag_size(tag_core), ATAG_CORE },
 756         { 1, PAGE_SIZE, 0xff },
 757         { tag_size(tag_mem32), ATAG_MEM },
 758         { MEM_SIZE, PHYS_OFFSET },
 759         { 0, ATAG_NONE }
 760 };
 761
 762 static void (*init_machine)(void) __initdata;
 763
 764 static int __init customize_machine(void)
 765 {
 766         /* customizes platform devices, or adds new ones */
 767         if (init_machine)
 768                 init_machine();
 769         return 0;
 770 }
 771 arch_initcall(customize_machine);
 772
 773 void __init setup_arch(char **cmdline_p)
 774 {
 775         struct tag *tags = (struct tag *)&init_tags;
 776         struct machine_desc *mdesc;
 777         char *from = default_command_line;
 778
 779         setup_processor();
 780         mdesc = setup_machine(machine_arch_type);
 781         machine_name = mdesc->name;
 782
 783         if (mdesc->soft_reboot)
 784                 reboot_setup("s");
 785
 786         if (__atags_pointer)
 787                 tags = phys_to_virt(__atags_pointer);
 788         else if (mdesc->boot_params)
 789                 tags = phys_to_virt(mdesc->boot_params);
 790
 791         /*
 792          * If we have the old style parameters, convert them to
 793          * a tag list.
 794          */
 795         if (tags->hdr.tag != ATAG_CORE)
 796                 convert_to_tag_list(tags);
 797         if (tags->hdr.tag != ATAG_CORE)
 798                 tags = (struct tag *)&init_tags;
 799
 800         if (mdesc->fixup)
 801                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 802
 803         if (tags->hdr.tag == ATAG_CORE) {
 804                 if (meminfo.nr_banks != 0)
 805                         squash_mem_tags(tags);
 806                 parse_tags(tags);
 807         }
 808
 809         init_mm.start_code = (unsigned long) &_text;
 810         init_mm.end_code   = (unsigned long) &_etext;
 811         init_mm.end_data   = (unsigned long) &_edata;
 812         init_mm.brk        = (unsigned long) &_end;
 813
 814         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 815         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 816         parse_cmdline(cmdline_p, from);
 817         paging_init(&meminfo, mdesc);
 818         request_standard_resources(&meminfo, mdesc);
 819
 820 #ifdef CONFIG_SMP
 821         smp_init_cpus();
 822 #endif
 823
 824         cpu_init();
 825
 826         /*
 827          * Set up various architecture-specific pointers
 828          */
 829         init_arch_irq = mdesc->init_irq;
 830         system_timer = mdesc->timer;
 831         init_machine = mdesc->init_machine;
 832
 833 #ifdef CONFIG_VT
 834 #if defined(CONFIG_VGA_CONSOLE)
 835         conswitchp = &vga_con;
 836 #elif defined(CONFIG_DUMMY_CONSOLE)
 837         conswitchp = &dummy_con;
 838 #endif
 839 #endif
 840 }
 841
 842
 843 static int __init topology_init(void)
 844 {
 845         int cpu;
 846
 847         for_each_possible_cpu(cpu) {
 848                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 849                 cpuinfo->cpu.hotpluggable = 1;
 850                 register_cpu(&cpuinfo->cpu, cpu);
 851         }
 852
 853         return 0;
 854 }
 855
 856 subsys_initcall(topology_init);
 857
 858 static const char *hwcap_str[] = {
 859         "swp",
 860         "half",
 861         "thumb",
 862         "26bit",
 863         "fastmult",
 864         "fpa",
 865         "vfp",
 866         "edsp",
 867         "java",
 868         "iwmmxt",
 869         "crunch",
 870         NULL
 871 };
 872
 873 static void
 874 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
 875 {
 876         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 877
 878         seq_printf(m, "%s size\t\t: %d\n"
 879                       "%s assoc\t\t: %d\n"
 880                       "%s line length\t: %d\n"
 881                       "%s sets\t\t: %d\n",
 882                 type, mult << (8 + CACHE_SIZE(cache)),
 883                 type, (mult << CACHE_ASSOC(cache)) >> 1,
 884                 type, 8 << CACHE_LINE(cache),
 885                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 886                             CACHE_LINE(cache)));
 887 }
 888
 889 static int c_show(struct seq_file *m, void *v)
 890 {
 891         int i;
 892
 893         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 894                    cpu_name, (int)processor_id & 15, elf_platform);
 895
 896 #if defined(CONFIG_SMP)
 897         for_each_online_cpu(i) {
 898                 /*
 899                  * glibc reads /proc/cpuinfo to determine the number of
 900                  * online processors, looking for lines beginning with
 901                  * "processor".  Give glibc what it expects.
 902                  */
 903                 seq_printf(m, "processor\t: %d\n", i);
 904                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 905                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 906                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 907         }
 908 #else /* CONFIG_SMP */
 909         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 910                    loops_per_jiffy / (500000/HZ),
 911                    (loops_per_jiffy / (5000/HZ)) % 100);
 912 #endif
 913
 914         /* dump out the processor features */
 915         seq_puts(m, "Features\t: ");
 916
 917         for (i = 0; hwcap_str[i]; i++)
 918                 if (elf_hwcap & (1 << i))
 919                         seq_printf(m, "%s ", hwcap_str[i]);
 920
 921         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
 922         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 923
 924         if ((processor_id & 0x0008f000) == 0x00000000) {
 925                 /* pre-ARM7 */
 926                 seq_printf(m, "CPU part\t: %07x\n", processor_id >> 4);
 927         } else {
 928                 if ((processor_id & 0x0008f000) == 0x00007000) {
 929                         /* ARM7 */
 930                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 931                                    (processor_id >> 16) & 127);
 932                 } else {
 933                         /* post-ARM7 */
 934                         seq_printf(m, "CPU variant\t: 0x%x\n",
 935                                    (processor_id >> 20) & 15);
 936                 }
 937                 seq_printf(m, "CPU part\t: 0x%03x\n",
 938                            (processor_id >> 4) & 0xfff);
 939         }
 940         seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
 941
 942         {
 943                 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
 944                 if (cache_info != processor_id) {
 945                         seq_printf(m, "Cache type\t: %s\n"
 946                                       "Cache clean\t: %s\n"
 947                                       "Cache lockdown\t: %s\n"
 948                                       "Cache format\t: %s\n",
 949                                    cache_types[CACHE_TYPE(cache_info)],
 950                                    cache_clean[CACHE_TYPE(cache_info)],
 951                                    cache_lockdown[CACHE_TYPE(cache_info)],
 952                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
 953
 954                         if (CACHE_S(cache_info)) {
 955                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
 956                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
 957                         } else {
 958                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
 959                         }
 960                 }
 961         }
 962
 963         seq_puts(m, "\n");
 964
 965         seq_printf(m, "Hardware\t: %s\n", machine_name);
 966         seq_printf(m, "Revision\t: %04x\n", system_rev);
 967         seq_printf(m, "Serial\t\t: %08x%08x\n",
 968                    system_serial_high, system_serial_low);
 969
 970         return 0;
 971 }
 972
 973 static void *c_start(struct seq_file *m, loff_t *pos)
 974 {
 975         return *pos < 1 ? (void *)1 : NULL;
 976 }
 977
 978 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 979 {
 980         ++*pos;
 981         return NULL;
 982 }
 983
 984 static void c_stop(struct seq_file *m, void *v)
 985 {
 986 }
 987
 988 struct seq_operations cpuinfo_op = {
 989         .start  = c_start,
 990         .next   = c_next,
 991         .stop   = c_stop,
 992         .show   = c_show
 993 };