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 if ((processor_id & 0x000f0000) == 0x000f0000) {
 308                 unsigned int mmfr0;
 309
 310                 /* Revised CPUID format. Read the Memory Model Feature
 311                  * Register 0 and check for VMSAv7 or PMSAv7 */
 312                 asm("mrc        p15, 0, %0, c0, c1, 4"
 313                     : "=r" (mmfr0));
 314                 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
 315                     (mmfr0 & 0x000000f0) == 0x00000030)
 316                         cpu_arch = CPU_ARCH_ARMv7;
 317                 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
 318                          (mmfr0 & 0x000000f0) == 0x00000020)
 319                         cpu_arch = CPU_ARCH_ARMv6;
 320                 else
 321                         cpu_arch = CPU_ARCH_UNKNOWN;
 322         } else
 323                 cpu_arch = CPU_ARCH_UNKNOWN;
 324
 325         return cpu_arch;
 326 }
 327
 328 /*
 329  * These functions re-use the assembly code in head.S, which
 330  * already provide the required functionality.
 331  */
 332 extern struct proc_info_list *lookup_processor_type(unsigned int);
 333 extern struct machine_desc *lookup_machine_type(unsigned int);
 334
 335 static void __init setup_processor(void)
 336 {
 337         struct proc_info_list *list;
 338
 339         /*
 340          * locate processor in the list of supported processor
 341          * types.  The linker builds this table for us from the
 342          * entries in arch/arm/mm/proc-*.S
 343          */
 344         list = lookup_processor_type(processor_id);
 345         if (!list) {
 346                 printk("CPU configuration botched (ID %08x), unable "
 347                        "to continue.\n", processor_id);
 348                 while (1);
 349         }
 350
 351         cpu_name = list->cpu_name;
 352
 353 #ifdef MULTI_CPU
 354         processor = *list->proc;
 355 #endif
 356 #ifdef MULTI_TLB
 357         cpu_tlb = *list->tlb;
 358 #endif
 359 #ifdef MULTI_USER
 360         cpu_user = *list->user;
 361 #endif
 362 #ifdef MULTI_CACHE
 363         cpu_cache = *list->cache;
 364 #endif
 365
 366         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 367                cpu_name, processor_id, (int)processor_id & 15,
 368                proc_arch[cpu_architecture()], cr_alignment);
 369
 370         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 371         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 372         elf_hwcap = list->elf_hwcap;
 373 #ifndef CONFIG_ARM_THUMB
 374         elf_hwcap &= ~HWCAP_THUMB;
 375 #endif
 376
 377         cpu_proc_init();
 378 }
 379
 380 /*
 381  * cpu_init - initialise one CPU.
 382  *
 383  * cpu_init dumps the cache information, initialises SMP specific
 384  * information, and sets up the per-CPU stacks.
 385  */
 386 void cpu_init(void)
 387 {
 388         unsigned int cpu = smp_processor_id();
 389         struct stack *stk = &stacks[cpu];
 390
 391         if (cpu >= NR_CPUS) {
 392                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 393                 BUG();
 394         }
 395
 396         if (system_state == SYSTEM_BOOTING)
 397                 dump_cpu_info(cpu);
 398
 399         /*
 400          * setup stacks for re-entrant exception handlers
 401          */
 402         __asm__ (
 403         "msr    cpsr_c, %1\n\t"
 404         "add    sp, %0, %2\n\t"
 405         "msr    cpsr_c, %3\n\t"
 406         "add    sp, %0, %4\n\t"
 407         "msr    cpsr_c, %5\n\t"
 408         "add    sp, %0, %6\n\t"
 409         "msr    cpsr_c, %7"
 410             :
 411             : "r" (stk),
 412               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 413               "I" (offsetof(struct stack, irq[0])),
 414               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 415               "I" (offsetof(struct stack, abt[0])),
 416               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 417               "I" (offsetof(struct stack, und[0])),
 418               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 419             : "r14");
 420 }
 421
 422 static struct machine_desc * __init setup_machine(unsigned int nr)
 423 {
 424         struct machine_desc *list;
 425
 426         /*
 427          * locate machine in the list of supported machines.
 428          */
 429         list = lookup_machine_type(nr);
 430         if (!list) {
 431                 printk("Machine configuration botched (nr %d), unable "
 432                        "to continue.\n", nr);
 433                 while (1);
 434         }
 435
 436         printk("Machine: %s\n", list->name);
 437
 438         return list;
 439 }
 440
 441 static void __init early_initrd(char **p)
 442 {
 443         unsigned long start, size;
 444
 445         start = memparse(*p, p);
 446         if (**p == ',') {
 447                 size = memparse((*p) + 1, p);
 448
 449                 phys_initrd_start = start;
 450                 phys_initrd_size = size;
 451         }
 452 }
 453 __early_param("initrd=", early_initrd);
 454
 455 static void __init arm_add_memory(unsigned long start, unsigned long size)
 456 {
 457         struct membank *bank;
 458
 459         /*
 460          * Ensure that start/size are aligned to a page boundary.
 461          * Size is appropriately rounded down, start is rounded up.
 462          */
 463         size -= start & ~PAGE_MASK;
 464
 465         bank = &meminfo.bank[meminfo.nr_banks++];
 466
 467         bank->start = PAGE_ALIGN(start);
 468         bank->size  = size & PAGE_MASK;
 469         bank->node  = PHYS_TO_NID(start);
 470 }
 471
 472 /*
 473  * Pick out the memory size.  We look for mem=size@start,
 474  * where start and size are "size[KkMm]"
 475  */
 476 static void __init early_mem(char **p)
 477 {
 478         static int usermem __initdata = 0;
 479         unsigned long size, start;
 480
 481         /*
 482          * If the user specifies memory size, we
 483          * blow away any automatically generated
 484          * size.
 485          */
 486         if (usermem == 0) {
 487                 usermem = 1;
 488                 meminfo.nr_banks = 0;
 489         }
 490
 491         start = PHYS_OFFSET;
 492         size  = memparse(*p, p);
 493         if (**p == '@')
 494                 start = memparse(*p + 1, p);
 495
 496         arm_add_memory(start, size);
 497 }
 498 __early_param("mem=", early_mem);
 499
 500 /*
 501  * Initial parsing of the command line.
 502  */
 503 static void __init parse_cmdline(char **cmdline_p, char *from)
 504 {
 505         char c = ' ', *to = command_line;
 506         int len = 0;
 507
 508         for (;;) {
 509                 if (c == ' ') {
 510                         extern struct early_params __early_begin, __early_end;
 511                         struct early_params *p;
 512
 513                         for (p = &__early_begin; p < &__early_end; p++) {
 514                                 int len = strlen(p->arg);
 515
 516                                 if (memcmp(from, p->arg, len) == 0) {
 517                                         if (to != command_line)
 518                                                 to -= 1;
 519                                         from += len;
 520                                         p->fn(&from);
 521
 522                                         while (*from != ' ' && *from != '\0')
 523                                                 from++;
 524                                         break;
 525                                 }
 526                         }
 527                 }
 528                 c = *from++;
 529                 if (!c)
 530                         break;
 531                 if (COMMAND_LINE_SIZE <= ++len)
 532                         break;
 533                 *to++ = c;
 534         }
 535         *to = '\0';
 536         *cmdline_p = command_line;
 537 }
 538
 539 static void __init
 540 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 541 {
 542 #ifdef CONFIG_BLK_DEV_RAM
 543         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 544
 545         rd_image_start = image_start;
 546         rd_prompt = prompt;
 547         rd_doload = doload;
 548
 549         if (rd_sz)
 550                 rd_size = rd_sz;
 551 #endif
 552 }
 553
 554 static void __init
 555 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
 556 {
 557         struct resource *res;
 558         int i;
 559
 560         kernel_code.start   = virt_to_phys(&_text);
 561         kernel_code.end     = virt_to_phys(&_etext - 1);
 562         kernel_data.start   = virt_to_phys(&__data_start);
 563         kernel_data.end     = virt_to_phys(&_end - 1);
 564
 565         for (i = 0; i < mi->nr_banks; i++) {
 566                 unsigned long virt_start, virt_end;
 567
 568                 if (mi->bank[i].size == 0)
 569                         continue;
 570
 571                 virt_start = __phys_to_virt(mi->bank[i].start);
 572                 virt_end   = virt_start + mi->bank[i].size - 1;
 573
 574                 res = alloc_bootmem_low(sizeof(*res));
 575                 res->name  = "System RAM";
 576                 res->start = __virt_to_phys(virt_start);
 577                 res->end   = __virt_to_phys(virt_end);
 578                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 579
 580                 request_resource(&iomem_resource, res);
 581
 582                 if (kernel_code.start >= res->start &&
 583                     kernel_code.end <= res->end)
 584                         request_resource(res, &kernel_code);
 585                 if (kernel_data.start >= res->start &&
 586                     kernel_data.end <= res->end)
 587                         request_resource(res, &kernel_data);
 588         }
 589
 590         if (mdesc->video_start) {
 591                 video_ram.start = mdesc->video_start;
 592                 video_ram.end   = mdesc->video_end;
 593                 request_resource(&iomem_resource, &video_ram);
 594         }
 595
 596         /*
 597          * Some machines don't have the possibility of ever
 598          * possessing lp0, lp1 or lp2
 599          */
 600         if (mdesc->reserve_lp0)
 601                 request_resource(&ioport_resource, &lp0);
 602         if (mdesc->reserve_lp1)
 603                 request_resource(&ioport_resource, &lp1);
 604         if (mdesc->reserve_lp2)
 605                 request_resource(&ioport_resource, &lp2);
 606 }
 607
 608 /*
 609  *  Tag parsing.
 610  *
 611  * This is the new way of passing data to the kernel at boot time.  Rather
 612  * than passing a fixed inflexible structure to the kernel, we pass a list
 613  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 614  * tag for the list to be recognised (to distinguish the tagged list from
 615  * a param_struct).  The list is terminated with a zero-length tag (this tag
 616  * is not parsed in any way).
 617  */
 618 static int __init parse_tag_core(const struct tag *tag)
 619 {
 620         if (tag->hdr.size > 2) {
 621                 if ((tag->u.core.flags & 1) == 0)
 622                         root_mountflags &= ~MS_RDONLY;
 623                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 624         }
 625         return 0;
 626 }
 627
 628 __tagtable(ATAG_CORE, parse_tag_core);
 629
 630 static int __init parse_tag_mem32(const struct tag *tag)
 631 {
 632         if (meminfo.nr_banks >= NR_BANKS) {
 633                 printk(KERN_WARNING
 634                        "Ignoring memory bank 0x%08x size %dKB\n",
 635                         tag->u.mem.start, tag->u.mem.size / 1024);
 636                 return -EINVAL;
 637         }
 638         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 639         return 0;
 640 }
 641
 642 __tagtable(ATAG_MEM, parse_tag_mem32);
 643
 644 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 645 struct screen_info screen_info = {
 646  .orig_video_lines      = 30,
 647  .orig_video_cols       = 80,
 648  .orig_video_mode       = 0,
 649  .orig_video_ega_bx     = 0,
 650  .orig_video_isVGA      = 1,
 651  .orig_video_points     = 8
 652 };
 653
 654 static int __init parse_tag_videotext(const struct tag *tag)
 655 {
 656         screen_info.orig_x            = tag->u.videotext.x;
 657         screen_info.orig_y            = tag->u.videotext.y;
 658         screen_info.orig_video_page   = tag->u.videotext.video_page;
 659         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 660         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 661         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 662         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 663         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 664         screen_info.orig_video_points = tag->u.videotext.video_points;
 665         return 0;
 666 }
 667
 668 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 669 #endif
 670
 671 static int __init parse_tag_ramdisk(const struct tag *tag)
 672 {
 673         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 674                       (tag->u.ramdisk.flags & 2) == 0,
 675                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 676         return 0;
 677 }
 678
 679 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 680
 681 static int __init parse_tag_initrd(const struct tag *tag)
 682 {
 683         printk(KERN_WARNING "ATAG_INITRD is deprecated; "
 684                 "please update your bootloader.\n");
 685         phys_initrd_start = __virt_to_phys(tag->u.initrd.start);
 686         phys_initrd_size = tag->u.initrd.size;
 687         return 0;
 688 }
 689
 690 __tagtable(ATAG_INITRD, parse_tag_initrd);
 691
 692 static int __init parse_tag_initrd2(const struct tag *tag)
 693 {
 694         phys_initrd_start = tag->u.initrd.start;
 695         phys_initrd_size = tag->u.initrd.size;
 696         return 0;
 697 }
 698
 699 __tagtable(ATAG_INITRD2, parse_tag_initrd2);
 700
 701 static int __init parse_tag_serialnr(const struct tag *tag)
 702 {
 703         system_serial_low = tag->u.serialnr.low;
 704         system_serial_high = tag->u.serialnr.high;
 705         return 0;
 706 }
 707
 708 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 709
 710 static int __init parse_tag_revision(const struct tag *tag)
 711 {
 712         system_rev = tag->u.revision.rev;
 713         return 0;
 714 }
 715
 716 __tagtable(ATAG_REVISION, parse_tag_revision);
 717
 718 static int __init parse_tag_cmdline(const struct tag *tag)
 719 {
 720         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 721         return 0;
 722 }
 723
 724 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 725
 726 /*
 727  * Scan the tag table for this tag, and call its parse function.
 728  * The tag table is built by the linker from all the __tagtable
 729  * declarations.
 730  */
 731 static int __init parse_tag(const struct tag *tag)
 732 {
 733         extern struct tagtable __tagtable_begin, __tagtable_end;
 734         struct tagtable *t;
 735
 736         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 737                 if (tag->hdr.tag == t->tag) {
 738                         t->parse(tag);
 739                         break;
 740                 }
 741
 742         return t < &__tagtable_end;
 743 }
 744
 745 /*
 746  * Parse all tags in the list, checking both the global and architecture
 747  * specific tag tables.
 748  */
 749 static void __init parse_tags(const struct tag *t)
 750 {
 751         for (; t->hdr.size; t = tag_next(t))
 752                 if (!parse_tag(t))
 753                         printk(KERN_WARNING
 754                                 "Ignoring unrecognised tag 0x%08x\n",
 755                                 t->hdr.tag);
 756 }
 757
 758 /*
 759  * This holds our defaults.
 760  */
 761 static struct init_tags {
 762         struct tag_header hdr1;
 763         struct tag_core   core;
 764         struct tag_header hdr2;
 765         struct tag_mem32  mem;
 766         struct tag_header hdr3;
 767 } init_tags __initdata = {
 768         { tag_size(tag_core), ATAG_CORE },
 769         { 1, PAGE_SIZE, 0xff },
 770         { tag_size(tag_mem32), ATAG_MEM },
 771         { MEM_SIZE, PHYS_OFFSET },
 772         { 0, ATAG_NONE }
 773 };
 774
 775 static void (*init_machine)(void) __initdata;
 776
 777 static int __init customize_machine(void)
 778 {
 779         /* customizes platform devices, or adds new ones */
 780         if (init_machine)
 781                 init_machine();
 782         return 0;
 783 }
 784 arch_initcall(customize_machine);
 785
 786 void __init setup_arch(char **cmdline_p)
 787 {
 788         struct tag *tags = (struct tag *)&init_tags;
 789         struct machine_desc *mdesc;
 790         char *from = default_command_line;
 791
 792         setup_processor();
 793         mdesc = setup_machine(machine_arch_type);
 794         machine_name = mdesc->name;
 795
 796         if (mdesc->soft_reboot)
 797                 reboot_setup("s");
 798
 799         if (__atags_pointer)
 800                 tags = phys_to_virt(__atags_pointer);
 801         else if (mdesc->boot_params)
 802                 tags = phys_to_virt(mdesc->boot_params);
 803
 804         /*
 805          * If we have the old style parameters, convert them to
 806          * a tag list.
 807          */
 808         if (tags->hdr.tag != ATAG_CORE)
 809                 convert_to_tag_list(tags);
 810         if (tags->hdr.tag != ATAG_CORE)
 811                 tags = (struct tag *)&init_tags;
 812
 813         if (mdesc->fixup)
 814                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 815
 816         if (tags->hdr.tag == ATAG_CORE) {
 817                 if (meminfo.nr_banks != 0)
 818                         squash_mem_tags(tags);
 819                 parse_tags(tags);
 820         }
 821
 822         init_mm.start_code = (unsigned long) &_text;
 823         init_mm.end_code   = (unsigned long) &_etext;
 824         init_mm.end_data   = (unsigned long) &_edata;
 825         init_mm.brk        = (unsigned long) &_end;
 826
 827         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 828         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 829         parse_cmdline(cmdline_p, from);
 830         paging_init(&meminfo, mdesc);
 831         request_standard_resources(&meminfo, mdesc);
 832
 833 #ifdef CONFIG_SMP
 834         smp_init_cpus();
 835 #endif
 836
 837         cpu_init();
 838
 839         /*
 840          * Set up various architecture-specific pointers
 841          */
 842         init_arch_irq = mdesc->init_irq;
 843         system_timer = mdesc->timer;
 844         init_machine = mdesc->init_machine;
 845
 846 #ifdef CONFIG_VT
 847 #if defined(CONFIG_VGA_CONSOLE)
 848         conswitchp = &vga_con;
 849 #elif defined(CONFIG_DUMMY_CONSOLE)
 850         conswitchp = &dummy_con;
 851 #endif
 852 #endif
 853 }
 854
 855
 856 static int __init topology_init(void)
 857 {
 858         int cpu;
 859
 860         for_each_possible_cpu(cpu) {
 861                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 862                 cpuinfo->cpu.hotpluggable = 1;
 863                 register_cpu(&cpuinfo->cpu, cpu);
 864         }
 865
 866         return 0;
 867 }
 868
 869 subsys_initcall(topology_init);
 870
 871 static const char *hwcap_str[] = {
 872         "swp",
 873         "half",
 874         "thumb",
 875         "26bit",
 876         "fastmult",
 877         "fpa",
 878         "vfp",
 879         "edsp",
 880         "java",
 881         "iwmmxt",
 882         "crunch",
 883         NULL
 884 };
 885
 886 static void
 887 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
 888 {
 889         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 890
 891         seq_printf(m, "%s size\t\t: %d\n"
 892                       "%s assoc\t\t: %d\n"
 893                       "%s line length\t: %d\n"
 894                       "%s sets\t\t: %d\n",
 895                 type, mult << (8 + CACHE_SIZE(cache)),
 896                 type, (mult << CACHE_ASSOC(cache)) >> 1,
 897                 type, 8 << CACHE_LINE(cache),
 898                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 899                             CACHE_LINE(cache)));
 900 }
 901
 902 static int c_show(struct seq_file *m, void *v)
 903 {
 904         int i;
 905
 906         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 907                    cpu_name, (int)processor_id & 15, elf_platform);
 908
 909 #if defined(CONFIG_SMP)
 910         for_each_online_cpu(i) {
 911                 /*
 912                  * glibc reads /proc/cpuinfo to determine the number of
 913                  * online processors, looking for lines beginning with
 914                  * "processor".  Give glibc what it expects.
 915                  */
 916                 seq_printf(m, "processor\t: %d\n", i);
 917                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 918                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 919                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 920         }
 921 #else /* CONFIG_SMP */
 922         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 923                    loops_per_jiffy / (500000/HZ),
 924                    (loops_per_jiffy / (5000/HZ)) % 100);
 925 #endif
 926
 927         /* dump out the processor features */
 928         seq_puts(m, "Features\t: ");
 929
 930         for (i = 0; hwcap_str[i]; i++)
 931                 if (elf_hwcap & (1 << i))
 932                         seq_printf(m, "%s ", hwcap_str[i]);
 933
 934         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", processor_id >> 24);
 935         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 936
 937         if ((processor_id & 0x0008f000) == 0x00000000) {
 938                 /* pre-ARM7 */
 939                 seq_printf(m, "CPU part\t: %07x\n", processor_id >> 4);
 940         } else {
 941                 if ((processor_id & 0x0008f000) == 0x00007000) {
 942                         /* ARM7 */
 943                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 944                                    (processor_id >> 16) & 127);
 945                 } else {
 946                         /* post-ARM7 */
 947                         seq_printf(m, "CPU variant\t: 0x%x\n",
 948                                    (processor_id >> 20) & 15);
 949                 }
 950                 seq_printf(m, "CPU part\t: 0x%03x\n",
 951                            (processor_id >> 4) & 0xfff);
 952         }
 953         seq_printf(m, "CPU revision\t: %d\n", processor_id & 15);
 954
 955         {
 956                 unsigned int cache_info = read_cpuid(CPUID_CACHETYPE);
 957                 if (cache_info != processor_id) {
 958                         seq_printf(m, "Cache type\t: %s\n"
 959                                       "Cache clean\t: %s\n"
 960                                       "Cache lockdown\t: %s\n"
 961                                       "Cache format\t: %s\n",
 962                                    cache_types[CACHE_TYPE(cache_info)],
 963                                    cache_clean[CACHE_TYPE(cache_info)],
 964                                    cache_lockdown[CACHE_TYPE(cache_info)],
 965                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
 966
 967                         if (CACHE_S(cache_info)) {
 968                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
 969                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
 970                         } else {
 971                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
 972                         }
 973                 }
 974         }
 975
 976         seq_puts(m, "\n");
 977
 978         seq_printf(m, "Hardware\t: %s\n", machine_name);
 979         seq_printf(m, "Revision\t: %04x\n", system_rev);
 980         seq_printf(m, "Serial\t\t: %08x%08x\n",
 981                    system_serial_high, system_serial_low);
 982
 983         return 0;
 984 }
 985
 986 static void *c_start(struct seq_file *m, loff_t *pos)
 987 {
 988         return *pos < 1 ? (void *)1 : NULL;
 989 }
 990
 991 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 992 {
 993         ++*pos;
 994         return NULL;
 995 }
 996
 997 static void c_stop(struct seq_file *m, void *v)
 998 {
 999 }
1000
1001 struct seq_operations cpuinfo_op = {
1002         .start  = c_start,
1003         .next   = c_next,
1004         .stop   = c_stop,
1005         .show   = c_show
1006 };