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 #include <linux/proc_fs.h>
  28
  29 #include <asm/unified.h>
  30 #include <asm/cpu.h>
  31 #include <asm/cputype.h>
  32 #include <asm/elf.h>
  33 #include <asm/procinfo.h>
  34 #include <asm/sections.h>
  35 #include <asm/setup.h>
  36 #include <asm/mach-types.h>
  37 #include <asm/cacheflush.h>
  38 #include <asm/cachetype.h>
  39 #include <asm/tlbflush.h>
  40
  41 #include <asm/mach/arch.h>
  42 #include <asm/mach/irq.h>
  43 #include <asm/mach/time.h>
  44 #include <asm/traps.h>
  45 #include <asm/unwind.h>
  46
  47 #include "compat.h"
  48 #include "atags.h"
  49 #include "tcm.h"
  50
  51 #ifndef MEM_SIZE
  52 #define MEM_SIZE        (16*1024*1024)
  53 #endif
  54
  55 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  56 char fpe_type[8];
  57
  58 static int __init fpe_setup(char *line)
  59 {
  60         memcpy(fpe_type, line, 8);
  61         return 1;
  62 }
  63
  64 __setup("fpe=", fpe_setup);
  65 #endif
  66
  67 extern void paging_init(struct machine_desc *desc);
  68 extern void reboot_setup(char *str);
  69
  70 unsigned int processor_id;
  71 EXPORT_SYMBOL(processor_id);
  72 unsigned int __machine_arch_type;
  73 EXPORT_SYMBOL(__machine_arch_type);
  74 unsigned int cacheid;
  75 EXPORT_SYMBOL(cacheid);
  76
  77 unsigned int __atags_pointer __initdata;
  78
  79 unsigned int system_rev;
  80 EXPORT_SYMBOL(system_rev);
  81
  82 unsigned int system_serial_low;
  83 EXPORT_SYMBOL(system_serial_low);
  84
  85 unsigned int system_serial_high;
  86 EXPORT_SYMBOL(system_serial_high);
  87
  88 unsigned int elf_hwcap;
  89 EXPORT_SYMBOL(elf_hwcap);
  90
  91
  92 #ifdef MULTI_CPU
  93 struct processor processor;
  94 #endif
  95 #ifdef MULTI_TLB
  96 struct cpu_tlb_fns cpu_tlb;
  97 #endif
  98 #ifdef MULTI_USER
  99 struct cpu_user_fns cpu_user;
 100 #endif
 101 #ifdef MULTI_CACHE
 102 struct cpu_cache_fns cpu_cache;
 103 #endif
 104 #ifdef CONFIG_OUTER_CACHE
 105 struct outer_cache_fns outer_cache;
 106 EXPORT_SYMBOL(outer_cache);
 107 #endif
 108
 109 struct stack {
 110         u32 irq[3];
 111         u32 abt[3];
 112         u32 und[3];
 113 } ____cacheline_aligned;
 114
 115 static struct stack stacks[NR_CPUS];
 116
 117 char elf_platform[ELF_PLATFORM_SIZE];
 118 EXPORT_SYMBOL(elf_platform);
 119
 120 static const char *cpu_name;
 121 static const char *machine_name;
 122 static char __initdata cmd_line[COMMAND_LINE_SIZE];
 123
 124 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 125 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 126 #define ENDIANNESS ((char)endian_test.l)
 127
 128 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 129
 130 /*
 131  * Standard memory resources
 132  */
 133 static struct resource mem_res[] = {
 134         {
 135                 .name = "Video RAM",
 136                 .start = 0,
 137                 .end = 0,
 138                 .flags = IORESOURCE_MEM
 139         },
 140         {
 141                 .name = "Kernel text",
 142                 .start = 0,
 143                 .end = 0,
 144                 .flags = IORESOURCE_MEM
 145         },
 146         {
 147                 .name = "Kernel data",
 148                 .start = 0,
 149                 .end = 0,
 150                 .flags = IORESOURCE_MEM
 151         }
 152 };
 153
 154 #define video_ram   mem_res[0]
 155 #define kernel_code mem_res[1]
 156 #define kernel_data mem_res[2]
 157
 158 static struct resource io_res[] = {
 159         {
 160                 .name = "reserved",
 161                 .start = 0x3bc,
 162                 .end = 0x3be,
 163                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 164         },
 165         {
 166                 .name = "reserved",
 167                 .start = 0x378,
 168                 .end = 0x37f,
 169                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 170         },
 171         {
 172                 .name = "reserved",
 173                 .start = 0x278,
 174                 .end = 0x27f,
 175                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 176         }
 177 };
 178
 179 #define lp0 io_res[0]
 180 #define lp1 io_res[1]
 181 #define lp2 io_res[2]
 182
 183 static const char *proc_arch[] = {
 184         "undefined/unknown",
 185         "3",
 186         "4",
 187         "4T",
 188         "5",
 189         "5T",
 190         "5TE",
 191         "5TEJ",
 192         "6TEJ",
 193         "7",
 194         "?(11)",
 195         "?(12)",
 196         "?(13)",
 197         "?(14)",
 198         "?(15)",
 199         "?(16)",
 200         "?(17)",
 201 };
 202
 203 int cpu_architecture(void)
 204 {
 205         int cpu_arch;
 206
 207         if ((read_cpuid_id() & 0x0008f000) == 0) {
 208                 cpu_arch = CPU_ARCH_UNKNOWN;
 209         } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 210                 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 211         } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
 212                 cpu_arch = (read_cpuid_id() >> 16) & 7;
 213                 if (cpu_arch)
 214                         cpu_arch += CPU_ARCH_ARMv3;
 215         } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
 216                 unsigned int mmfr0;
 217
 218                 /* Revised CPUID format. Read the Memory Model Feature
 219                  * Register 0 and check for VMSAv7 or PMSAv7 */
 220                 asm("mrc        p15, 0, %0, c0, c1, 4"
 221                     : "=r" (mmfr0));
 222                 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
 223                     (mmfr0 & 0x000000f0) == 0x00000030)
 224                         cpu_arch = CPU_ARCH_ARMv7;
 225                 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
 226                          (mmfr0 & 0x000000f0) == 0x00000020)
 227                         cpu_arch = CPU_ARCH_ARMv6;
 228                 else
 229                         cpu_arch = CPU_ARCH_UNKNOWN;
 230         } else
 231                 cpu_arch = CPU_ARCH_UNKNOWN;
 232
 233         return cpu_arch;
 234 }
 235
 236 static void __init cacheid_init(void)
 237 {
 238         unsigned int cachetype = read_cpuid_cachetype();
 239         unsigned int arch = cpu_architecture();
 240
 241         if (arch >= CPU_ARCH_ARMv6) {
 242                 if ((cachetype & (7 << 29)) == 4 << 29) {
 243                         /* ARMv7 register format */
 244                         cacheid = CACHEID_VIPT_NONALIASING;
 245                         if ((cachetype & (3 << 14)) == 1 << 14)
 246                                 cacheid |= CACHEID_ASID_TAGGED;
 247                 } else if (cachetype & (1 << 23))
 248                         cacheid = CACHEID_VIPT_ALIASING;
 249                 else
 250                         cacheid = CACHEID_VIPT_NONALIASING;
 251         } else {
 252                 cacheid = CACHEID_VIVT;
 253         }
 254
 255         printk("CPU: %s data cache, %s instruction cache\n",
 256                 cache_is_vivt() ? "VIVT" :
 257                 cache_is_vipt_aliasing() ? "VIPT aliasing" :
 258                 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
 259                 cache_is_vivt() ? "VIVT" :
 260                 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
 261                 cache_is_vipt_aliasing() ? "VIPT aliasing" :
 262                 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
 263 }
 264
 265 /*
 266  * These functions re-use the assembly code in head.S, which
 267  * already provide the required functionality.
 268  */
 269 extern struct proc_info_list *lookup_processor_type(unsigned int);
 270 extern struct machine_desc *lookup_machine_type(unsigned int);
 271
 272 static void __init setup_processor(void)
 273 {
 274         struct proc_info_list *list;
 275
 276         /*
 277          * locate processor in the list of supported processor
 278          * types.  The linker builds this table for us from the
 279          * entries in arch/arm/mm/proc-*.S
 280          */
 281         list = lookup_processor_type(read_cpuid_id());
 282         if (!list) {
 283                 printk("CPU configuration botched (ID %08x), unable "
 284                        "to continue.\n", read_cpuid_id());
 285                 while (1);
 286         }
 287
 288         cpu_name = list->cpu_name;
 289
 290 #ifdef MULTI_CPU
 291         processor = *list->proc;
 292 #endif
 293 #ifdef MULTI_TLB
 294         cpu_tlb = *list->tlb;
 295 #endif
 296 #ifdef MULTI_USER
 297         cpu_user = *list->user;
 298 #endif
 299 #ifdef MULTI_CACHE
 300         cpu_cache = *list->cache;
 301 #endif
 302
 303         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 304                cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
 305                proc_arch[cpu_architecture()], cr_alignment);
 306
 307         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 308         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 309         elf_hwcap = list->elf_hwcap;
 310 #ifndef CONFIG_ARM_THUMB
 311         elf_hwcap &= ~HWCAP_THUMB;
 312 #endif
 313
 314         cacheid_init();
 315         cpu_proc_init();
 316 }
 317
 318 /*
 319  * cpu_init - initialise one CPU.
 320  *
 321  * cpu_init sets up the per-CPU stacks.
 322  */
 323 void cpu_init(void)
 324 {
 325         unsigned int cpu = smp_processor_id();
 326         struct stack *stk = &stacks[cpu];
 327
 328         if (cpu >= NR_CPUS) {
 329                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 330                 BUG();
 331         }
 332
 333         /*
 334          * Define the placement constraint for the inline asm directive below.
 335          * In Thumb-2, msr with an immediate value is not allowed.
 336          */
 337 #ifdef CONFIG_THUMB2_KERNEL
 338 #define PLC     "r"
 339 #else
 340 #define PLC     "I"
 341 #endif
 342
 343         /*
 344          * setup stacks for re-entrant exception handlers
 345          */
 346         __asm__ (
 347         "msr    cpsr_c, %1\n\t"
 348         "add    r14, %0, %2\n\t"
 349         "mov    sp, r14\n\t"
 350         "msr    cpsr_c, %3\n\t"
 351         "add    r14, %0, %4\n\t"
 352         "mov    sp, r14\n\t"
 353         "msr    cpsr_c, %5\n\t"
 354         "add    r14, %0, %6\n\t"
 355         "mov    sp, r14\n\t"
 356         "msr    cpsr_c, %7"
 357             :
 358             : "r" (stk),
 359               PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 360               "I" (offsetof(struct stack, irq[0])),
 361               PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 362               "I" (offsetof(struct stack, abt[0])),
 363               PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 364               "I" (offsetof(struct stack, und[0])),
 365               PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 366             : "r14");
 367 }
 368
 369 static struct machine_desc * __init setup_machine(unsigned int nr)
 370 {
 371         struct machine_desc *list;
 372
 373         /*
 374          * locate machine in the list of supported machines.
 375          */
 376         list = lookup_machine_type(nr);
 377         if (!list) {
 378                 printk("Machine configuration botched (nr %d), unable "
 379                        "to continue.\n", nr);
 380                 while (1);
 381         }
 382
 383         printk("Machine: %s\n", list->name);
 384
 385         return list;
 386 }
 387
 388 static int __init arm_add_memory(unsigned long start, unsigned long size)
 389 {
 390         struct membank *bank = &meminfo.bank[meminfo.nr_banks];
 391
 392         if (meminfo.nr_banks >= NR_BANKS) {
 393                 printk(KERN_CRIT "NR_BANKS too low, "
 394                         "ignoring memory at %#lx\n", start);
 395                 return -EINVAL;
 396         }
 397
 398         /*
 399          * Ensure that start/size are aligned to a page boundary.
 400          * Size is appropriately rounded down, start is rounded up.
 401          */
 402         size -= start & ~PAGE_MASK;
 403         bank->start = PAGE_ALIGN(start);
 404         bank->size  = size & PAGE_MASK;
 405         bank->node  = PHYS_TO_NID(start);
 406
 407         /*
 408          * Check whether this memory region has non-zero size or
 409          * invalid node number.
 410          */
 411         if (bank->size == 0 || bank->node >= MAX_NUMNODES)
 412                 return -EINVAL;
 413
 414         meminfo.nr_banks++;
 415         return 0;
 416 }
 417
 418 /*
 419  * Pick out the memory size.  We look for mem=size@start,
 420  * where start and size are "size[KkMm]"
 421  */
 422 static int __init early_mem(char *p)
 423 {
 424         static int usermem __initdata = 0;
 425         unsigned long size, start;
 426         char *endp;
 427
 428         /*
 429          * If the user specifies memory size, we
 430          * blow away any automatically generated
 431          * size.
 432          */
 433         if (usermem == 0) {
 434                 usermem = 1;
 435                 meminfo.nr_banks = 0;
 436         }
 437
 438         start = PHYS_OFFSET;
 439         size  = memparse(p, &endp);
 440         if (*endp == '@')
 441                 start = memparse(endp + 1, NULL);
 442
 443         arm_add_memory(start, size);
 444
 445         return 0;
 446 }
 447 early_param("mem", early_mem);
 448
 449 static void __init
 450 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 451 {
 452 #ifdef CONFIG_BLK_DEV_RAM
 453         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 454
 455         rd_image_start = image_start;
 456         rd_prompt = prompt;
 457         rd_doload = doload;
 458
 459         if (rd_sz)
 460                 rd_size = rd_sz;
 461 #endif
 462 }
 463
 464 static void __init
 465 request_standard_resources(struct meminfo *mi, struct machine_desc *mdesc)
 466 {
 467         struct resource *res;
 468         int i;
 469
 470         kernel_code.start   = virt_to_phys(_text);
 471         kernel_code.end     = virt_to_phys(_etext - 1);
 472         kernel_data.start   = virt_to_phys(_data);
 473         kernel_data.end     = virt_to_phys(_end - 1);
 474
 475         for (i = 0; i < mi->nr_banks; i++) {
 476                 if (mi->bank[i].size == 0)
 477                         continue;
 478
 479                 res = alloc_bootmem_low(sizeof(*res));
 480                 res->name  = "System RAM";
 481                 res->start = mi->bank[i].start;
 482                 res->end   = mi->bank[i].start + mi->bank[i].size - 1;
 483                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 484
 485                 request_resource(&iomem_resource, res);
 486
 487                 if (kernel_code.start >= res->start &&
 488                     kernel_code.end <= res->end)
 489                         request_resource(res, &kernel_code);
 490                 if (kernel_data.start >= res->start &&
 491                     kernel_data.end <= res->end)
 492                         request_resource(res, &kernel_data);
 493         }
 494
 495         if (mdesc->video_start) {
 496                 video_ram.start = mdesc->video_start;
 497                 video_ram.end   = mdesc->video_end;
 498                 request_resource(&iomem_resource, &video_ram);
 499         }
 500
 501         /*
 502          * Some machines don't have the possibility of ever
 503          * possessing lp0, lp1 or lp2
 504          */
 505         if (mdesc->reserve_lp0)
 506                 request_resource(&ioport_resource, &lp0);
 507         if (mdesc->reserve_lp1)
 508                 request_resource(&ioport_resource, &lp1);
 509         if (mdesc->reserve_lp2)
 510                 request_resource(&ioport_resource, &lp2);
 511 }
 512
 513 /*
 514  *  Tag parsing.
 515  *
 516  * This is the new way of passing data to the kernel at boot time.  Rather
 517  * than passing a fixed inflexible structure to the kernel, we pass a list
 518  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 519  * tag for the list to be recognised (to distinguish the tagged list from
 520  * a param_struct).  The list is terminated with a zero-length tag (this tag
 521  * is not parsed in any way).
 522  */
 523 static int __init parse_tag_core(const struct tag *tag)
 524 {
 525         if (tag->hdr.size > 2) {
 526                 if ((tag->u.core.flags & 1) == 0)
 527                         root_mountflags &= ~MS_RDONLY;
 528                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 529         }
 530         return 0;
 531 }
 532
 533 __tagtable(ATAG_CORE, parse_tag_core);
 534
 535 static int __init parse_tag_mem32(const struct tag *tag)
 536 {
 537         return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 538 }
 539
 540 __tagtable(ATAG_MEM, parse_tag_mem32);
 541
 542 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 543 struct screen_info screen_info = {
 544  .orig_video_lines      = 30,
 545  .orig_video_cols       = 80,
 546  .orig_video_mode       = 0,
 547  .orig_video_ega_bx     = 0,
 548  .orig_video_isVGA      = 1,
 549  .orig_video_points     = 8
 550 };
 551
 552 static int __init parse_tag_videotext(const struct tag *tag)
 553 {
 554         screen_info.orig_x            = tag->u.videotext.x;
 555         screen_info.orig_y            = tag->u.videotext.y;
 556         screen_info.orig_video_page   = tag->u.videotext.video_page;
 557         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 558         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 559         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 560         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 561         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 562         screen_info.orig_video_points = tag->u.videotext.video_points;
 563         return 0;
 564 }
 565
 566 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 567 #endif
 568
 569 static int __init parse_tag_ramdisk(const struct tag *tag)
 570 {
 571         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 572                       (tag->u.ramdisk.flags & 2) == 0,
 573                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 574         return 0;
 575 }
 576
 577 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 578
 579 static int __init parse_tag_serialnr(const struct tag *tag)
 580 {
 581         system_serial_low = tag->u.serialnr.low;
 582         system_serial_high = tag->u.serialnr.high;
 583         return 0;
 584 }
 585
 586 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 587
 588 static int __init parse_tag_revision(const struct tag *tag)
 589 {
 590         system_rev = tag->u.revision.rev;
 591         return 0;
 592 }
 593
 594 __tagtable(ATAG_REVISION, parse_tag_revision);
 595
 596 #ifndef CONFIG_CMDLINE_FORCE
 597 static int __init parse_tag_cmdline(const struct tag *tag)
 598 {
 599         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 600         return 0;
 601 }
 602
 603 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 604 #endif /* CONFIG_CMDLINE_FORCE */
 605
 606 /*
 607  * Scan the tag table for this tag, and call its parse function.
 608  * The tag table is built by the linker from all the __tagtable
 609  * declarations.
 610  */
 611 static int __init parse_tag(const struct tag *tag)
 612 {
 613         extern struct tagtable __tagtable_begin, __tagtable_end;
 614         struct tagtable *t;
 615
 616         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 617                 if (tag->hdr.tag == t->tag) {
 618                         t->parse(tag);
 619                         break;
 620                 }
 621
 622         return t < &__tagtable_end;
 623 }
 624
 625 /*
 626  * Parse all tags in the list, checking both the global and architecture
 627  * specific tag tables.
 628  */
 629 static void __init parse_tags(const struct tag *t)
 630 {
 631         for (; t->hdr.size; t = tag_next(t))
 632                 if (!parse_tag(t))
 633                         printk(KERN_WARNING
 634                                 "Ignoring unrecognised tag 0x%08x\n",
 635                                 t->hdr.tag);
 636 }
 637
 638 /*
 639  * This holds our defaults.
 640  */
 641 static struct init_tags {
 642         struct tag_header hdr1;
 643         struct tag_core   core;
 644         struct tag_header hdr2;
 645         struct tag_mem32  mem;
 646         struct tag_header hdr3;
 647 } init_tags __initdata = {
 648         { tag_size(tag_core), ATAG_CORE },
 649         { 1, PAGE_SIZE, 0xff },
 650         { tag_size(tag_mem32), ATAG_MEM },
 651         { MEM_SIZE, PHYS_OFFSET },
 652         { 0, ATAG_NONE }
 653 };
 654
 655 static void (*init_machine)(void) __initdata;
 656
 657 static int __init customize_machine(void)
 658 {
 659         /* customizes platform devices, or adds new ones */
 660         if (init_machine)
 661                 init_machine();
 662         return 0;
 663 }
 664 arch_initcall(customize_machine);
 665
 666 void __init setup_arch(char **cmdline_p)
 667 {
 668         struct tag *tags = (struct tag *)&init_tags;
 669         struct machine_desc *mdesc;
 670         char *from = default_command_line;
 671
 672         unwind_init();
 673
 674         setup_processor();
 675         mdesc = setup_machine(machine_arch_type);
 676         machine_name = mdesc->name;
 677
 678         if (mdesc->soft_reboot)
 679                 reboot_setup("s");
 680
 681         if (__atags_pointer)
 682                 tags = phys_to_virt(__atags_pointer);
 683         else if (mdesc->boot_params)
 684                 tags = phys_to_virt(mdesc->boot_params);
 685
 686         /*
 687          * If we have the old style parameters, convert them to
 688          * a tag list.
 689          */
 690         if (tags->hdr.tag != ATAG_CORE)
 691                 convert_to_tag_list(tags);
 692         if (tags->hdr.tag != ATAG_CORE)
 693                 tags = (struct tag *)&init_tags;
 694
 695         if (mdesc->fixup)
 696                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 697
 698         if (tags->hdr.tag == ATAG_CORE) {
 699                 if (meminfo.nr_banks != 0)
 700                         squash_mem_tags(tags);
 701                 save_atags(tags);
 702                 parse_tags(tags);
 703         }
 704
 705         init_mm.start_code = (unsigned long) _text;
 706         init_mm.end_code   = (unsigned long) _etext;
 707         init_mm.end_data   = (unsigned long) _edata;
 708         init_mm.brk        = (unsigned long) _end;
 709
 710         /* parse_early_param needs a boot_command_line */
 711         strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 712
 713         /* populate cmd_line too for later use, preserving boot_command_line */
 714         strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
 715         *cmdline_p = cmd_line;
 716
 717         parse_early_param();
 718
 719         paging_init(mdesc);
 720         request_standard_resources(&meminfo, mdesc);
 721
 722 #ifdef CONFIG_SMP
 723         smp_init_cpus();
 724 #endif
 725
 726         cpu_init();
 727         tcm_init();
 728
 729         /*
 730          * Set up various architecture-specific pointers
 731          */
 732         init_arch_irq = mdesc->init_irq;
 733         system_timer = mdesc->timer;
 734         init_machine = mdesc->init_machine;
 735
 736 #ifdef CONFIG_VT
 737 #if defined(CONFIG_VGA_CONSOLE)
 738         conswitchp = &vga_con;
 739 #elif defined(CONFIG_DUMMY_CONSOLE)
 740         conswitchp = &dummy_con;
 741 #endif
 742 #endif
 743         early_trap_init();
 744 }
 745
 746
 747 static int __init topology_init(void)
 748 {
 749         int cpu;
 750
 751         for_each_possible_cpu(cpu) {
 752                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 753                 cpuinfo->cpu.hotpluggable = 1;
 754                 register_cpu(&cpuinfo->cpu, cpu);
 755         }
 756
 757         return 0;
 758 }
 759 subsys_initcall(topology_init);
 760
 761 #ifdef CONFIG_HAVE_PROC_CPU
 762 static int __init proc_cpu_init(void)
 763 {
 764         struct proc_dir_entry *res;
 765
 766         res = proc_mkdir("cpu", NULL);
 767         if (!res)
 768                 return -ENOMEM;
 769         return 0;
 770 }
 771 fs_initcall(proc_cpu_init);
 772 #endif
 773
 774 static const char *hwcap_str[] = {
 775         "swp",
 776         "half",
 777         "thumb",
 778         "26bit",
 779         "fastmult",
 780         "fpa",
 781         "vfp",
 782         "edsp",
 783         "java",
 784         "iwmmxt",
 785         "crunch",
 786         "thumbee",
 787         "neon",
 788         "vfpv3",
 789         "vfpv3d16",
 790         NULL
 791 };
 792
 793 static int c_show(struct seq_file *m, void *v)
 794 {
 795         int i;
 796
 797         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 798                    cpu_name, read_cpuid_id() & 15, elf_platform);
 799
 800 #if defined(CONFIG_SMP)
 801         for_each_online_cpu(i) {
 802                 /*
 803                  * glibc reads /proc/cpuinfo to determine the number of
 804                  * online processors, looking for lines beginning with
 805                  * "processor".  Give glibc what it expects.
 806                  */
 807                 seq_printf(m, "processor\t: %d\n", i);
 808                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 809                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 810                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 811         }
 812 #else /* CONFIG_SMP */
 813         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 814                    loops_per_jiffy / (500000/HZ),
 815                    (loops_per_jiffy / (5000/HZ)) % 100);
 816 #endif
 817
 818         /* dump out the processor features */
 819         seq_puts(m, "Features\t: ");
 820
 821         for (i = 0; hwcap_str[i]; i++)
 822                 if (elf_hwcap & (1 << i))
 823                         seq_printf(m, "%s ", hwcap_str[i]);
 824
 825         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 826         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 827
 828         if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
 829                 /* pre-ARM7 */
 830                 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
 831         } else {
 832                 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 833                         /* ARM7 */
 834                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 835                                    (read_cpuid_id() >> 16) & 127);
 836                 } else {
 837                         /* post-ARM7 */
 838                         seq_printf(m, "CPU variant\t: 0x%x\n",
 839                                    (read_cpuid_id() >> 20) & 15);
 840                 }
 841                 seq_printf(m, "CPU part\t: 0x%03x\n",
 842                            (read_cpuid_id() >> 4) & 0xfff);
 843         }
 844         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 845
 846         seq_puts(m, "\n");
 847
 848         seq_printf(m, "Hardware\t: %s\n", machine_name);
 849         seq_printf(m, "Revision\t: %04x\n", system_rev);
 850         seq_printf(m, "Serial\t\t: %08x%08x\n",
 851                    system_serial_high, system_serial_low);
 852
 853         return 0;
 854 }
 855
 856 static void *c_start(struct seq_file *m, loff_t *pos)
 857 {
 858         return *pos < 1 ? (void *)1 : NULL;
 859 }
 860
 861 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 862 {
 863         ++*pos;
 864         return NULL;
 865 }
 866
 867 static void c_stop(struct seq_file *m, void *v)
 868 {
 869 }
 870
 871 const struct seq_operations cpuinfo_op = {
 872         .start  = c_start,
 873         .next   = c_next,
 874         .stop   = c_stop,
 875         .show   = c_show
 876 };