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