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