arch/arm/kernel/setup.c

   1 /*
   2  *  linux/arch/arm/kernel/setup.c
   3  *
   4  *  Copyright (C) 1995-2001 Russell King
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10 #include <linux/module.h>
  11 #include <linux/kernel.h>
  12 #include <linux/stddef.h>
  13 #include <linux/ioport.h>
  14 #include <linux/delay.h>
  15 #include <linux/utsname.h>
  16 #include <linux/initrd.h>
  17 #include <linux/console.h>
  18 #include <linux/bootmem.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/screen_info.h>
  21 #include <linux/init.h>
  22 #include <linux/root_dev.h>
  23 #include <linux/cpu.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/smp.h>
  26 #include <linux/fs.h>
  27
  28 #include <asm/cpu.h>
  29 #include <asm/cputype.h>
  30 #include <asm/elf.h>
  31 #include <asm/procinfo.h>
  32 #include <asm/setup.h>
  33 #include <asm/mach-types.h>
  34 #include <asm/cacheflush.h>
  35 #include <asm/cachetype.h>
  36 #include <asm/tlbflush.h>
  37
  38 #include <asm/mach/arch.h>
  39 #include <asm/mach/irq.h>
  40 #include <asm/mach/time.h>
  41 #include <asm/traps.h>
  42
  43 #include "compat.h"
  44 #include "atags.h"
  45
  46 #ifndef MEM_SIZE
  47 #define MEM_SIZE        (16*1024*1024)
  48 #endif
  49
  50 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  51 char fpe_type[8];
  52
  53 static int __init fpe_setup(char *line)
  54 {
  55         memcpy(fpe_type, line, 8);
  56         return 1;
  57 }
  58
  59 __setup("fpe=", fpe_setup);
  60 #endif
  61
  62 extern void paging_init(struct meminfo *, struct machine_desc *desc);
  63 extern void reboot_setup(char *str);
  64 extern void _text, _etext, __data_start, _edata, _end;
  65
  66 unsigned int processor_id;
  67 EXPORT_SYMBOL(processor_id);
  68 unsigned int __machine_arch_type;
  69 EXPORT_SYMBOL(__machine_arch_type);
  70 unsigned int cacheid;
  71 EXPORT_SYMBOL(cacheid);
  72
  73 unsigned int __atags_pointer __initdata;
  74
  75 unsigned int system_rev;
  76 EXPORT_SYMBOL(system_rev);
  77
  78 unsigned int system_serial_low;
  79 EXPORT_SYMBOL(system_serial_low);
  80
  81 unsigned int system_serial_high;
  82 EXPORT_SYMBOL(system_serial_high);
  83
  84 unsigned int elf_hwcap;
  85 EXPORT_SYMBOL(elf_hwcap);
  86
  87 unsigned long __initdata vmalloc_reserve = 128 << 20;
  88
  89
  90 #ifdef MULTI_CPU
  91 struct processor processor;
  92 #endif
  93 #ifdef MULTI_TLB
  94 struct cpu_tlb_fns cpu_tlb;
  95 #endif
  96 #ifdef MULTI_USER
  97 struct cpu_user_fns cpu_user;
  98 #endif
  99 #ifdef MULTI_CACHE
 100 struct cpu_cache_fns cpu_cache;
 101 #endif
 102 #ifdef CONFIG_OUTER_CACHE
 103 struct outer_cache_fns outer_cache;
 104 #endif
 105
 106 struct stack {
 107         u32 irq[3];
 108         u32 abt[3];
 109         u32 und[3];
 110 } ____cacheline_aligned;
 111
 112 static struct stack stacks[NR_CPUS];
 113
 114 char elf_platform[ELF_PLATFORM_SIZE];
 115 EXPORT_SYMBOL(elf_platform);
 116
 117 static struct meminfo meminfo __initdata = { 0, };
 118 static const char *cpu_name;
 119 static const char *machine_name;
 120 static char __initdata command_line[COMMAND_LINE_SIZE];
 121
 122 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 123 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 124 #define ENDIANNESS ((char)endian_test.l)
 125
 126 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 127
 128 /*
 129  * Standard memory resources
 130  */
 131 static struct resource mem_res[] = {
 132         {
 133                 .name = "Video RAM",
 134                 .start = 0,
 135                 .end = 0,
 136                 .flags = IORESOURCE_MEM
 137         },
 138         {
 139                 .name = "Kernel text",
 140                 .start = 0,
 141                 .end = 0,
 142                 .flags = IORESOURCE_MEM
 143         },
 144         {
 145                 .name = "Kernel data",
 146                 .start = 0,
 147                 .end = 0,
 148                 .flags = IORESOURCE_MEM
 149         }
 150 };
 151
 152 #define video_ram   mem_res[0]
 153 #define kernel_code mem_res[1]
 154 #define kernel_data mem_res[2]
 155
 156 static struct resource io_res[] = {
 157         {
 158                 .name = "reserved",
 159                 .start = 0x3bc,
 160                 .end = 0x3be,
 161                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 162         },
 163         {
 164                 .name = "reserved",
 165                 .start = 0x378,
 166                 .end = 0x37f,
 167                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 168         },
 169         {
 170                 .name = "reserved",
 171                 .start = 0x278,
 172                 .end = 0x27f,
 173                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 174         }
 175 };
 176
 177 #define lp0 io_res[0]
 178 #define lp1 io_res[1]
 179 #define lp2 io_res[2]
 180
 181 static const char *proc_arch[] = {
 182         "undefined/unknown",
 183         "3",
 184         "4",
 185         "4T",
 186         "5",
 187         "5T",
 188         "5TE",
 189         "5TEJ",
 190         "6TEJ",
 191         "7",
 192         "?(11)",
 193         "?(12)",
 194         "?(13)",
 195         "?(14)",
 196         "?(15)",
 197         "?(16)",
 198         "?(17)",
 199 };
 200
 201 int cpu_architecture(void)
 202 {
 203         int cpu_arch;
 204
 205         if ((read_cpuid_id() & 0x0008f000) == 0) {
 206                 cpu_arch = CPU_ARCH_UNKNOWN;
 207         } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 208                 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 209         } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
 210                 cpu_arch = (read_cpuid_id() >> 16) & 7;
 211                 if (cpu_arch)
 212                         cpu_arch += CPU_ARCH_ARMv3;
 213         } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
 214                 unsigned int mmfr0;
 215
 216                 /* Revised CPUID format. Read the Memory Model Feature
 217                  * Register 0 and check for VMSAv7 or PMSAv7 */
 218                 asm("mrc        p15, 0, %0, c0, c1, 4"
 219                     : "=r" (mmfr0));
 220                 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
 221                     (mmfr0 & 0x000000f0) == 0x00000030)
 222                         cpu_arch = CPU_ARCH_ARMv7;
 223                 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
 224                          (mmfr0 & 0x000000f0) == 0x00000020)
 225                         cpu_arch = CPU_ARCH_ARMv6;
 226                 else
 227                         cpu_arch = CPU_ARCH_UNKNOWN;
 228         } else
 229                 cpu_arch = CPU_ARCH_UNKNOWN;
 230
 231         return cpu_arch;
 232 }
 233
 234 static void __init cacheid_init(void)
 235 {
 236         unsigned int cachetype = read_cpuid_cachetype();
 237         unsigned int arch = cpu_architecture();
 238
 239         if (arch >= CPU_ARCH_ARMv7) {
 240                 cacheid = CACHEID_VIPT_NONALIASING;
 241                 if ((cachetype & (3 << 14)) == 1 << 14)
 242                         cacheid |= CACHEID_ASID_TAGGED;
 243         } else if (arch >= CPU_ARCH_ARMv6) {
 244                 if (cachetype & (1 << 23))
 245                         cacheid = CACHEID_VIPT_ALIASING;
 246                 else
 247                         cacheid = CACHEID_VIPT_NONALIASING;
 248         } else {
 249                 cacheid = CACHEID_VIVT;
 250         }
 251
 252         printk("CPU: %s data cache, %s instruction cache\n",
 253                 cache_is_vivt() ? "VIVT" :
 254                 cache_is_vipt_aliasing() ? "VIPT aliasing" :
 255                 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
 256                 cache_is_vivt() ? "VIVT" :
 257                 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
 258                 cache_is_vipt_aliasing() ? "VIPT aliasing" :
 259                 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
 260 }
 261
 262 /*
 263  * These functions re-use the assembly code in head.S, which
 264  * already provide the required functionality.
 265  */
 266 extern struct proc_info_list *lookup_processor_type(unsigned int);
 267 extern struct machine_desc *lookup_machine_type(unsigned int);
 268
 269 static void __init setup_processor(void)
 270 {
 271         struct proc_info_list *list;
 272
 273         /*
 274          * locate processor in the list of supported processor
 275          * types.  The linker builds this table for us from the
 276          * entries in arch/arm/mm/proc-*.S
 277          */
 278         list = lookup_processor_type(read_cpuid_id());
 279         if (!list) {
 280                 printk("CPU configuration botched (ID %08x), unable "
 281                        "to continue.\n", read_cpuid_id());
 282                 while (1);
 283         }
 284
 285         cpu_name = list->cpu_name;
 286
 287 #ifdef MULTI_CPU
 288         processor = *list->proc;
 289 #endif
 290 #ifdef MULTI_TLB
 291         cpu_tlb = *list->tlb;
 292 #endif
 293 #ifdef MULTI_USER
 294         cpu_user = *list->user;
 295 #endif
 296 #ifdef MULTI_CACHE
 297         cpu_cache = *list->cache;
 298 #endif
 299
 300         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 301                cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
 302                proc_arch[cpu_architecture()], cr_alignment);
 303
 304         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 305         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 306         elf_hwcap = list->elf_hwcap;
 307 #ifndef CONFIG_ARM_THUMB
 308         elf_hwcap &= ~HWCAP_THUMB;
 309 #endif
 310
 311         cacheid_init();
 312         cpu_proc_init();
 313 }
 314
 315 /*
 316  * cpu_init - initialise one CPU.
 317  *
 318  * cpu_init sets up the per-CPU stacks.
 319  */
 320 void cpu_init(void)
 321 {
 322         unsigned int cpu = smp_processor_id();
 323         struct stack *stk = &stacks[cpu];
 324
 325         if (cpu >= NR_CPUS) {
 326                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 327                 BUG();
 328         }
 329
 330         /*
 331          * setup stacks for re-entrant exception handlers
 332          */
 333         __asm__ (
 334         "msr    cpsr_c, %1\n\t"
 335         "add    sp, %0, %2\n\t"
 336         "msr    cpsr_c, %3\n\t"
 337         "add    sp, %0, %4\n\t"
 338         "msr    cpsr_c, %5\n\t"
 339         "add    sp, %0, %6\n\t"
 340         "msr    cpsr_c, %7"
 341             :
 342             : "r" (stk),
 343               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 344               "I" (offsetof(struct stack, irq[0])),
 345               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 346               "I" (offsetof(struct stack, abt[0])),
 347               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 348               "I" (offsetof(struct stack, und[0])),
 349               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 350             : "r14");
 351 }
 352
 353 static struct machine_desc * __init setup_machine(unsigned int nr)
 354 {
 355         struct machine_desc *list;
 356
 357         /*
 358          * locate machine in the list of supported machines.
 359          */
 360         list = lookup_machine_type(nr);
 361         if (!list) {
 362                 printk("Machine configuration botched (nr %d), unable "
 363                        "to continue.\n", nr);
 364                 while (1);
 365         }
 366
 367         printk("Machine: %s\n", list->name);
 368
 369         return list;
 370 }
 371
 372 static void __init arm_add_memory(unsigned long start, unsigned long size)
 373 {
 374         struct membank *bank;
 375
 376         /*
 377          * Ensure that start/size are aligned to a page boundary.
 378          * Size is appropriately rounded down, start is rounded up.
 379          */
 380         size -= start & ~PAGE_MASK;
 381
 382         bank = &meminfo.bank[meminfo.nr_banks++];
 383
 384         bank->start = PAGE_ALIGN(start);
 385         bank->size  = size & PAGE_MASK;
 386         bank->node  = PHYS_TO_NID(start);
 387 }
 388
 389 /*
 390  * Pick out the memory size.  We look for mem=size@start,
 391  * where start and size are "size[KkMm]"
 392  */
 393 static void __init early_mem(char **p)
 394 {
 395         static int usermem __initdata = 0;
 396         unsigned long size, start;
 397
 398         /*
 399          * If the user specifies memory size, we
 400          * blow away any automatically generated
 401          * size.
 402          */
 403         if (usermem == 0) {
 404                 usermem = 1;
 405                 meminfo.nr_banks = 0;
 406         }
 407
 408         start = PHYS_OFFSET;
 409         size  = memparse(*p, p);
 410         if (**p == '@')
 411                 start = memparse(*p + 1, p);
 412
 413         arm_add_memory(start, size);
 414 }
 415 __early_param("mem=", early_mem);
 416
 417 /*
 418  * vmalloc=size forces the vmalloc area to be exactly 'size'
 419  * bytes. This can be used to increase (or decrease) the vmalloc
 420  * area - the default is 128m.
 421  */
 422 static void __init early_vmalloc(char **arg)
 423 {
 424         vmalloc_reserve = memparse(*arg, arg);
 425 }
 426 __early_param("vmalloc=", early_vmalloc);
 427
 428 /*
 429  * Initial parsing of the command line.
 430  */
 431 static void __init parse_cmdline(char **cmdline_p, char *from)
 432 {
 433         char c = ' ', *to = command_line;
 434         int len = 0;
 435
 436         for (;;) {
 437                 if (c == ' ') {
 438                         extern struct early_params __early_begin, __early_end;
 439                         struct early_params *p;
 440
 441                         for (p = &__early_begin; p < &__early_end; p++) {
 442                                 int arglen = strlen(p->arg);
 443
 444                                 if (memcmp(from, p->arg, arglen) == 0) {
 445                                         if (to != command_line)
 446                                                 to -= 1;
 447                                         from += arglen;
 448                                         p->fn(&from);
 449
 450                                         while (*from != ' ' && *from != '\0')
 451                                                 from++;
 452                                         break;
 453                                 }
 454                         }
 455                 }
 456                 c = *from++;
 457                 if (!c)
 458                         break;
 459                 if (COMMAND_LINE_SIZE <= ++len)
 460                         break;
 461                 *to++ = c;
 462         }
 463         *to = '\0';
 464         *cmdline_p = command_line;
 465 }
 466
 467 static void __init
 468 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 469 {
 470 #ifdef CONFIG_BLK_DEV_RAM
 471         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 472
 473         rd_image_start = image_start;
 474         rd_prompt = prompt;
 475         rd_doload = doload;
 476
 477         if (rd_sz)
 478                 rd_size = rd_sz;
 479 #endif
 480 }
 481
 482 static void __init
 483 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
 484 {
 485         struct resource *res;
 486         int i;
 487
 488         kernel_code.start   = virt_to_phys(&_text);
 489         kernel_code.end     = virt_to_phys(&_etext - 1);
 490         kernel_data.start   = virt_to_phys(&__data_start);
 491         kernel_data.end     = virt_to_phys(&_end - 1);
 492
 493         for (i = 0; i < mi->nr_banks; i++) {
 494                 unsigned long virt_start, virt_end;
 495
 496                 if (mi->bank[i].size == 0)
 497                         continue;
 498
 499                 virt_start = __phys_to_virt(mi->bank[i].start);
 500                 virt_end   = virt_start + mi->bank[i].size - 1;
 501
 502                 res = alloc_bootmem_low(sizeof(*res));
 503                 res->name  = "System RAM";
 504                 res->start = __virt_to_phys(virt_start);
 505                 res->end   = __virt_to_phys(virt_end);
 506                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 507
 508                 request_resource(&iomem_resource, res);
 509
 510                 if (kernel_code.start >= res->start &&
 511                     kernel_code.end <= res->end)
 512                         request_resource(res, &kernel_code);
 513                 if (kernel_data.start >= res->start &&
 514                     kernel_data.end <= res->end)
 515                         request_resource(res, &kernel_data);
 516         }
 517
 518         if (mdesc->video_start) {
 519                 video_ram.start = mdesc->video_start;
 520                 video_ram.end   = mdesc->video_end;
 521                 request_resource(&iomem_resource, &video_ram);
 522         }
 523
 524         /*
 525          * Some machines don't have the possibility of ever
 526          * possessing lp0, lp1 or lp2
 527          */
 528         if (mdesc->reserve_lp0)
 529                 request_resource(&ioport_resource, &lp0);
 530         if (mdesc->reserve_lp1)
 531                 request_resource(&ioport_resource, &lp1);
 532         if (mdesc->reserve_lp2)
 533                 request_resource(&ioport_resource, &lp2);
 534 }
 535
 536 /*
 537  *  Tag parsing.
 538  *
 539  * This is the new way of passing data to the kernel at boot time.  Rather
 540  * than passing a fixed inflexible structure to the kernel, we pass a list
 541  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 542  * tag for the list to be recognised (to distinguish the tagged list from
 543  * a param_struct).  The list is terminated with a zero-length tag (this tag
 544  * is not parsed in any way).
 545  */
 546 static int __init parse_tag_core(const struct tag *tag)
 547 {
 548         if (tag->hdr.size > 2) {
 549                 if ((tag->u.core.flags & 1) == 0)
 550                         root_mountflags &= ~MS_RDONLY;
 551                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 552         }
 553         return 0;
 554 }
 555
 556 __tagtable(ATAG_CORE, parse_tag_core);
 557
 558 static int __init parse_tag_mem32(const struct tag *tag)
 559 {
 560         if (meminfo.nr_banks >= NR_BANKS) {
 561                 printk(KERN_WARNING
 562                        "Ignoring memory bank 0x%08x size %dKB\n",
 563                         tag->u.mem.start, tag->u.mem.size / 1024);
 564                 return -EINVAL;
 565         }
 566         arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 567         return 0;
 568 }
 569
 570 __tagtable(ATAG_MEM, parse_tag_mem32);
 571
 572 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 573 struct screen_info screen_info = {
 574  .orig_video_lines      = 30,
 575  .orig_video_cols       = 80,
 576  .orig_video_mode       = 0,
 577  .orig_video_ega_bx     = 0,
 578  .orig_video_isVGA      = 1,
 579  .orig_video_points     = 8
 580 };
 581
 582 static int __init parse_tag_videotext(const struct tag *tag)
 583 {
 584         screen_info.orig_x            = tag->u.videotext.x;
 585         screen_info.orig_y            = tag->u.videotext.y;
 586         screen_info.orig_video_page   = tag->u.videotext.video_page;
 587         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 588         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 589         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 590         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 591         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 592         screen_info.orig_video_points = tag->u.videotext.video_points;
 593         return 0;
 594 }
 595
 596 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 597 #endif
 598
 599 static int __init parse_tag_ramdisk(const struct tag *tag)
 600 {
 601         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 602                       (tag->u.ramdisk.flags & 2) == 0,
 603                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 604         return 0;
 605 }
 606
 607 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 608
 609 static int __init parse_tag_serialnr(const struct tag *tag)
 610 {
 611         system_serial_low = tag->u.serialnr.low;
 612         system_serial_high = tag->u.serialnr.high;
 613         return 0;
 614 }
 615
 616 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 617
 618 static int __init parse_tag_revision(const struct tag *tag)
 619 {
 620         system_rev = tag->u.revision.rev;
 621         return 0;
 622 }
 623
 624 __tagtable(ATAG_REVISION, parse_tag_revision);
 625
 626 static int __init parse_tag_cmdline(const struct tag *tag)
 627 {
 628         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 629         return 0;
 630 }
 631
 632 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 633
 634 /*
 635  * Scan the tag table for this tag, and call its parse function.
 636  * The tag table is built by the linker from all the __tagtable
 637  * declarations.
 638  */
 639 static int __init parse_tag(const struct tag *tag)
 640 {
 641         extern struct tagtable __tagtable_begin, __tagtable_end;
 642         struct tagtable *t;
 643
 644         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 645                 if (tag->hdr.tag == t->tag) {
 646                         t->parse(tag);
 647                         break;
 648                 }
 649
 650         return t < &__tagtable_end;
 651 }
 652
 653 /*
 654  * Parse all tags in the list, checking both the global and architecture
 655  * specific tag tables.
 656  */
 657 static void __init parse_tags(const struct tag *t)
 658 {
 659         for (; t->hdr.size; t = tag_next(t))
 660                 if (!parse_tag(t))
 661                         printk(KERN_WARNING
 662                                 "Ignoring unrecognised tag 0x%08x\n",
 663                                 t->hdr.tag);
 664 }
 665
 666 /*
 667  * This holds our defaults.
 668  */
 669 static struct init_tags {
 670         struct tag_header hdr1;
 671         struct tag_core   core;
 672         struct tag_header hdr2;
 673         struct tag_mem32  mem;
 674         struct tag_header hdr3;
 675 } init_tags __initdata = {
 676         { tag_size(tag_core), ATAG_CORE },
 677         { 1, PAGE_SIZE, 0xff },
 678         { tag_size(tag_mem32), ATAG_MEM },
 679         { MEM_SIZE, PHYS_OFFSET },
 680         { 0, ATAG_NONE }
 681 };
 682
 683 static void (*init_machine)(void) __initdata;
 684
 685 static int __init customize_machine(void)
 686 {
 687         /* customizes platform devices, or adds new ones */
 688         if (init_machine)
 689                 init_machine();
 690         return 0;
 691 }
 692 arch_initcall(customize_machine);
 693
 694 void __init setup_arch(char **cmdline_p)
 695 {
 696         struct tag *tags = (struct tag *)&init_tags;
 697         struct machine_desc *mdesc;
 698         char *from = default_command_line;
 699
 700         setup_processor();
 701         mdesc = setup_machine(machine_arch_type);
 702         machine_name = mdesc->name;
 703
 704         if (mdesc->soft_reboot)
 705                 reboot_setup("s");
 706
 707         if (__atags_pointer)
 708                 tags = phys_to_virt(__atags_pointer);
 709         else if (mdesc->boot_params)
 710                 tags = phys_to_virt(mdesc->boot_params);
 711
 712         /*
 713          * If we have the old style parameters, convert them to
 714          * a tag list.
 715          */
 716         if (tags->hdr.tag != ATAG_CORE)
 717                 convert_to_tag_list(tags);
 718         if (tags->hdr.tag != ATAG_CORE)
 719                 tags = (struct tag *)&init_tags;
 720
 721         if (mdesc->fixup)
 722                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 723
 724         if (tags->hdr.tag == ATAG_CORE) {
 725                 if (meminfo.nr_banks != 0)
 726                         squash_mem_tags(tags);
 727                 save_atags(tags);
 728                 parse_tags(tags);
 729         }
 730
 731         init_mm.start_code = (unsigned long) &_text;
 732         init_mm.end_code   = (unsigned long) &_etext;
 733         init_mm.end_data   = (unsigned long) &_edata;
 734         init_mm.brk        = (unsigned long) &_end;
 735
 736         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 737         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 738         parse_cmdline(cmdline_p, from);
 739         paging_init(&meminfo, mdesc);
 740         request_standard_resources(&meminfo, mdesc);
 741
 742 #ifdef CONFIG_SMP
 743         smp_init_cpus();
 744 #endif
 745
 746         cpu_init();
 747
 748         /*
 749          * Set up various architecture-specific pointers
 750          */
 751         init_arch_irq = mdesc->init_irq;
 752         system_timer = mdesc->timer;
 753         init_machine = mdesc->init_machine;
 754
 755 #ifdef CONFIG_VT
 756 #if defined(CONFIG_VGA_CONSOLE)
 757         conswitchp = &vga_con;
 758 #elif defined(CONFIG_DUMMY_CONSOLE)
 759         conswitchp = &dummy_con;
 760 #endif
 761 #endif
 762         early_trap_init();
 763 }
 764
 765
 766 static int __init topology_init(void)
 767 {
 768         int cpu;
 769
 770         for_each_possible_cpu(cpu) {
 771                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 772                 cpuinfo->cpu.hotpluggable = 1;
 773                 register_cpu(&cpuinfo->cpu, cpu);
 774         }
 775
 776         return 0;
 777 }
 778
 779 subsys_initcall(topology_init);
 780
 781 static const char *hwcap_str[] = {
 782         "swp",
 783         "half",
 784         "thumb",
 785         "26bit",
 786         "fastmult",
 787         "fpa",
 788         "vfp",
 789         "edsp",
 790         "java",
 791         "iwmmxt",
 792         "crunch",
 793         NULL
 794 };
 795
 796 static int c_show(struct seq_file *m, void *v)
 797 {
 798         int i;
 799
 800         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 801                    cpu_name, read_cpuid_id() & 15, elf_platform);
 802
 803 #if defined(CONFIG_SMP)
 804         for_each_online_cpu(i) {
 805                 /*
 806                  * glibc reads /proc/cpuinfo to determine the number of
 807                  * online processors, looking for lines beginning with
 808                  * "processor".  Give glibc what it expects.
 809                  */
 810                 seq_printf(m, "processor\t: %d\n", i);
 811                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 812                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 813                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 814         }
 815 #else /* CONFIG_SMP */
 816         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 817                    loops_per_jiffy / (500000/HZ),
 818                    (loops_per_jiffy / (5000/HZ)) % 100);
 819 #endif
 820
 821         /* dump out the processor features */
 822         seq_puts(m, "Features\t: ");
 823
 824         for (i = 0; hwcap_str[i]; i++)
 825                 if (elf_hwcap & (1 << i))
 826                         seq_printf(m, "%s ", hwcap_str[i]);
 827
 828         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 829         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 830
 831         if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
 832                 /* pre-ARM7 */
 833                 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
 834         } else {
 835                 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 836                         /* ARM7 */
 837                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 838                                    (read_cpuid_id() >> 16) & 127);
 839                 } else {
 840                         /* post-ARM7 */
 841                         seq_printf(m, "CPU variant\t: 0x%x\n",
 842                                    (read_cpuid_id() >> 20) & 15);
 843                 }
 844                 seq_printf(m, "CPU part\t: 0x%03x\n",
 845                            (read_cpuid_id() >> 4) & 0xfff);
 846         }
 847         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 848
 849         seq_puts(m, "\n");
 850
 851         seq_printf(m, "Hardware\t: %s\n", machine_name);
 852         seq_printf(m, "Revision\t: %04x\n", system_rev);
 853         seq_printf(m, "Serial\t\t: %08x%08x\n",
 854                    system_serial_high, system_serial_low);
 855
 856         return 0;
 857 }
 858
 859 static void *c_start(struct seq_file *m, loff_t *pos)
 860 {
 861         return *pos < 1 ? (void *)1 : NULL;
 862 }
 863
 864 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 865 {
 866         ++*pos;
 867         return NULL;
 868 }
 869
 870 static void c_stop(struct seq_file *m, void *v)
 871 {
 872 }
 873
 874 const struct seq_operations cpuinfo_op = {
 875         .start  = c_start,
 876         .next   = c_next,
 877         .stop   = c_stop,
 878         .show   = c_show
 879 };