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 *cache_types[16] = {
 180         "write-through",
 181         "write-back",
 182         "write-back",
 183         "undefined 3",
 184         "undefined 4",
 185         "undefined 5",
 186         "write-back",
 187         "write-back",
 188         "undefined 8",
 189         "undefined 9",
 190         "undefined 10",
 191         "undefined 11",
 192         "undefined 12",
 193         "undefined 13",
 194         "write-back",
 195         "undefined 15",
 196 };
 197
 198 static const char *cache_clean[16] = {
 199         "not required",
 200         "read-block",
 201         "cp15 c7 ops",
 202         "undefined 3",
 203         "undefined 4",
 204         "undefined 5",
 205         "cp15 c7 ops",
 206         "cp15 c7 ops",
 207         "undefined 8",
 208         "undefined 9",
 209         "undefined 10",
 210         "undefined 11",
 211         "undefined 12",
 212         "undefined 13",
 213         "cp15 c7 ops",
 214         "undefined 15",
 215 };
 216
 217 static const char *cache_lockdown[16] = {
 218         "not supported",
 219         "not supported",
 220         "not supported",
 221         "undefined 3",
 222         "undefined 4",
 223         "undefined 5",
 224         "format A",
 225         "format B",
 226         "undefined 8",
 227         "undefined 9",
 228         "undefined 10",
 229         "undefined 11",
 230         "undefined 12",
 231         "undefined 13",
 232         "format C",
 233         "undefined 15",
 234 };
 235
 236 static const char *proc_arch[] = {
 237         "undefined/unknown",
 238         "3",
 239         "4",
 240         "4T",
 241         "5",
 242         "5T",
 243         "5TE",
 244         "5TEJ",
 245         "6TEJ",
 246         "7",
 247         "?(11)",
 248         "?(12)",
 249         "?(13)",
 250         "?(14)",
 251         "?(15)",
 252         "?(16)",
 253         "?(17)",
 254 };
 255
 256 #define CACHE_TYPE(x)   (((x) >> 25) & 15)
 257 #define CACHE_S(x)      ((x) & (1 << 24))
 258 #define CACHE_DSIZE(x)  (((x) >> 12) & 4095)    /* only if S=1 */
 259 #define CACHE_ISIZE(x)  ((x) & 4095)
 260
 261 #define CACHE_SIZE(y)   (((y) >> 6) & 7)
 262 #define CACHE_ASSOC(y)  (((y) >> 3) & 7)
 263 #define CACHE_M(y)      ((y) & (1 << 2))
 264 #define CACHE_LINE(y)   ((y) & 3)
 265
 266 static inline void dump_cache(const char *prefix, int cpu, unsigned int cache)
 267 {
 268         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 269
 270         printk("CPU%u: %s: %d bytes, associativity %d, %d byte lines, %d sets\n",
 271                 cpu, prefix,
 272                 mult << (8 + CACHE_SIZE(cache)),
 273                 (mult << CACHE_ASSOC(cache)) >> 1,
 274                 8 << CACHE_LINE(cache),
 275                 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 276                         CACHE_LINE(cache)));
 277 }
 278
 279 static void __init dump_cpu_info(int cpu)
 280 {
 281         unsigned int info = read_cpuid_cachetype();
 282
 283         if (info != read_cpuid_id()) {
 284                 printk("CPU%u: D %s %s cache\n", cpu, cache_is_vivt() ? "VIVT" : "VIPT",
 285                        cache_types[CACHE_TYPE(info)]);
 286                 if (CACHE_S(info)) {
 287                         dump_cache("I cache", cpu, CACHE_ISIZE(info));
 288                         dump_cache("D cache", cpu, CACHE_DSIZE(info));
 289                 } else {
 290                         dump_cache("cache", cpu, CACHE_ISIZE(info));
 291                 }
 292         }
 293
 294         if (arch_is_coherent())
 295                 printk("Cache coherency enabled\n");
 296 }
 297
 298 int cpu_architecture(void)
 299 {
 300         int cpu_arch;
 301
 302         if ((read_cpuid_id() & 0x0008f000) == 0) {
 303                 cpu_arch = CPU_ARCH_UNKNOWN;
 304         } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 305                 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 306         } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
 307                 cpu_arch = (read_cpuid_id() >> 16) & 7;
 308                 if (cpu_arch)
 309                         cpu_arch += CPU_ARCH_ARMv3;
 310         } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
 311                 unsigned int mmfr0;
 312
 313                 /* Revised CPUID format. Read the Memory Model Feature
 314                  * Register 0 and check for VMSAv7 or PMSAv7 */
 315                 asm("mrc        p15, 0, %0, c0, c1, 4"
 316                     : "=r" (mmfr0));
 317                 if ((mmfr0 & 0x0000000f) == 0x00000003 ||
 318                     (mmfr0 & 0x000000f0) == 0x00000030)
 319                         cpu_arch = CPU_ARCH_ARMv7;
 320                 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
 321                          (mmfr0 & 0x000000f0) == 0x00000020)
 322                         cpu_arch = CPU_ARCH_ARMv6;
 323                 else
 324                         cpu_arch = CPU_ARCH_UNKNOWN;
 325         } else
 326                 cpu_arch = CPU_ARCH_UNKNOWN;
 327
 328         return cpu_arch;
 329 }
 330
 331 /*
 332  * These functions re-use the assembly code in head.S, which
 333  * already provide the required functionality.
 334  */
 335 extern struct proc_info_list *lookup_processor_type(unsigned int);
 336 extern struct machine_desc *lookup_machine_type(unsigned int);
 337
 338 static void __init setup_processor(void)
 339 {
 340         struct proc_info_list *list;
 341
 342         /*
 343          * locate processor in the list of supported processor
 344          * types.  The linker builds this table for us from the
 345          * entries in arch/arm/mm/proc-*.S
 346          */
 347         list = lookup_processor_type(read_cpuid_id());
 348         if (!list) {
 349                 printk("CPU configuration botched (ID %08x), unable "
 350                        "to continue.\n", read_cpuid_id());
 351                 while (1);
 352         }
 353
 354         cpu_name = list->cpu_name;
 355
 356 #ifdef MULTI_CPU
 357         processor = *list->proc;
 358 #endif
 359 #ifdef MULTI_TLB
 360         cpu_tlb = *list->tlb;
 361 #endif
 362 #ifdef MULTI_USER
 363         cpu_user = *list->user;
 364 #endif
 365 #ifdef MULTI_CACHE
 366         cpu_cache = *list->cache;
 367 #endif
 368
 369         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 370                cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
 371                proc_arch[cpu_architecture()], cr_alignment);
 372
 373         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 374         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 375         elf_hwcap = list->elf_hwcap;
 376 #ifndef CONFIG_ARM_THUMB
 377         elf_hwcap &= ~HWCAP_THUMB;
 378 #endif
 379
 380         cpu_proc_init();
 381 }
 382
 383 /*
 384  * cpu_init - initialise one CPU.
 385  *
 386  * cpu_init dumps the cache information, initialises SMP specific
 387  * information, and sets up the per-CPU stacks.
 388  */
 389 void cpu_init(void)
 390 {
 391         unsigned int cpu = smp_processor_id();
 392         struct stack *stk = &stacks[cpu];
 393
 394         if (cpu >= NR_CPUS) {
 395                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 396                 BUG();
 397         }
 398
 399         if (system_state == SYSTEM_BOOTING)
 400                 dump_cpu_info(cpu);
 401
 402         /*
 403          * setup stacks for re-entrant exception handlers
 404          */
 405         __asm__ (
 406         "msr    cpsr_c, %1\n\t"
 407         "add    sp, %0, %2\n\t"
 408         "msr    cpsr_c, %3\n\t"
 409         "add    sp, %0, %4\n\t"
 410         "msr    cpsr_c, %5\n\t"
 411         "add    sp, %0, %6\n\t"
 412         "msr    cpsr_c, %7"
 413             :
 414             : "r" (stk),
 415               "I" (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 416               "I" (offsetof(struct stack, irq[0])),
 417               "I" (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 418               "I" (offsetof(struct stack, abt[0])),
 419               "I" (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 420               "I" (offsetof(struct stack, und[0])),
 421               "I" (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 422             : "r14");
 423 }
 424
 425 static struct machine_desc * __init setup_machine(unsigned int nr)
 426 {
 427         struct machine_desc *list;
 428
 429         /*
 430          * locate machine in the list of supported machines.
 431          */
 432         list = lookup_machine_type(nr);
 433         if (!list) {
 434                 printk("Machine configuration botched (nr %d), unable "
 435                        "to continue.\n", nr);
 436                 while (1);
 437         }
 438
 439         printk("Machine: %s\n", list->name);
 440
 441         return list;
 442 }
 443
 444 static void __init arm_add_memory(unsigned long start, unsigned long size)
 445 {
 446         struct membank *bank;
 447
 448         /*
 449          * Ensure that start/size are aligned to a page boundary.
 450          * Size is appropriately rounded down, start is rounded up.
 451          */
 452         size -= start & ~PAGE_MASK;
 453
 454         bank = &meminfo.bank[meminfo.nr_banks++];
 455
 456         bank->start = PAGE_ALIGN(start);
 457         bank->size  = size & PAGE_MASK;
 458         bank->node  = PHYS_TO_NID(start);
 459 }
 460
 461 /*
 462  * Pick out the memory size.  We look for mem=size@start,
 463  * where start and size are "size[KkMm]"
 464  */
 465 static void __init early_mem(char **p)
 466 {
 467         static int usermem __initdata = 0;
 468         unsigned long size, start;
 469
 470         /*
 471          * If the user specifies memory size, we
 472          * blow away any automatically generated
 473          * size.
 474          */
 475         if (usermem == 0) {
 476                 usermem = 1;
 477                 meminfo.nr_banks = 0;
 478         }
 479
 480         start = PHYS_OFFSET;
 481         size  = memparse(*p, p);
 482         if (**p == '@')
 483                 start = memparse(*p + 1, p);
 484
 485         arm_add_memory(start, size);
 486 }
 487 __early_param("mem=", early_mem);
 488
 489 /*
 490  * vmalloc=size forces the vmalloc area to be exactly 'size'
 491  * bytes. This can be used to increase (or decrease) the vmalloc
 492  * area - the default is 128m.
 493  */
 494 static void __init early_vmalloc(char **arg)
 495 {
 496         vmalloc_reserve = memparse(*arg, arg);
 497 }
 498 __early_param("vmalloc=", early_vmalloc);
 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 arglen = strlen(p->arg);
 515
 516                                 if (memcmp(from, p->arg, arglen) == 0) {
 517                                         if (to != command_line)
 518                                                 to -= 1;
 519                                         from += arglen;
 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_serialnr(const struct tag *tag)
 682 {
 683         system_serial_low = tag->u.serialnr.low;
 684         system_serial_high = tag->u.serialnr.high;
 685         return 0;
 686 }
 687
 688 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 689
 690 static int __init parse_tag_revision(const struct tag *tag)
 691 {
 692         system_rev = tag->u.revision.rev;
 693         return 0;
 694 }
 695
 696 __tagtable(ATAG_REVISION, parse_tag_revision);
 697
 698 static int __init parse_tag_cmdline(const struct tag *tag)
 699 {
 700         strlcpy(default_command_line, tag->u.cmdline.cmdline, COMMAND_LINE_SIZE);
 701         return 0;
 702 }
 703
 704 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 705
 706 /*
 707  * Scan the tag table for this tag, and call its parse function.
 708  * The tag table is built by the linker from all the __tagtable
 709  * declarations.
 710  */
 711 static int __init parse_tag(const struct tag *tag)
 712 {
 713         extern struct tagtable __tagtable_begin, __tagtable_end;
 714         struct tagtable *t;
 715
 716         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 717                 if (tag->hdr.tag == t->tag) {
 718                         t->parse(tag);
 719                         break;
 720                 }
 721
 722         return t < &__tagtable_end;
 723 }
 724
 725 /*
 726  * Parse all tags in the list, checking both the global and architecture
 727  * specific tag tables.
 728  */
 729 static void __init parse_tags(const struct tag *t)
 730 {
 731         for (; t->hdr.size; t = tag_next(t))
 732                 if (!parse_tag(t))
 733                         printk(KERN_WARNING
 734                                 "Ignoring unrecognised tag 0x%08x\n",
 735                                 t->hdr.tag);
 736 }
 737
 738 /*
 739  * This holds our defaults.
 740  */
 741 static struct init_tags {
 742         struct tag_header hdr1;
 743         struct tag_core   core;
 744         struct tag_header hdr2;
 745         struct tag_mem32  mem;
 746         struct tag_header hdr3;
 747 } init_tags __initdata = {
 748         { tag_size(tag_core), ATAG_CORE },
 749         { 1, PAGE_SIZE, 0xff },
 750         { tag_size(tag_mem32), ATAG_MEM },
 751         { MEM_SIZE, PHYS_OFFSET },
 752         { 0, ATAG_NONE }
 753 };
 754
 755 static void (*init_machine)(void) __initdata;
 756
 757 static int __init customize_machine(void)
 758 {
 759         /* customizes platform devices, or adds new ones */
 760         if (init_machine)
 761                 init_machine();
 762         return 0;
 763 }
 764 arch_initcall(customize_machine);
 765
 766 void __init setup_arch(char **cmdline_p)
 767 {
 768         struct tag *tags = (struct tag *)&init_tags;
 769         struct machine_desc *mdesc;
 770         char *from = default_command_line;
 771
 772         setup_processor();
 773         mdesc = setup_machine(machine_arch_type);
 774         machine_name = mdesc->name;
 775
 776         if (mdesc->soft_reboot)
 777                 reboot_setup("s");
 778
 779         if (__atags_pointer)
 780                 tags = phys_to_virt(__atags_pointer);
 781         else if (mdesc->boot_params)
 782                 tags = phys_to_virt(mdesc->boot_params);
 783
 784         /*
 785          * If we have the old style parameters, convert them to
 786          * a tag list.
 787          */
 788         if (tags->hdr.tag != ATAG_CORE)
 789                 convert_to_tag_list(tags);
 790         if (tags->hdr.tag != ATAG_CORE)
 791                 tags = (struct tag *)&init_tags;
 792
 793         if (mdesc->fixup)
 794                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 795
 796         if (tags->hdr.tag == ATAG_CORE) {
 797                 if (meminfo.nr_banks != 0)
 798                         squash_mem_tags(tags);
 799                 save_atags(tags);
 800                 parse_tags(tags);
 801         }
 802
 803         init_mm.start_code = (unsigned long) &_text;
 804         init_mm.end_code   = (unsigned long) &_etext;
 805         init_mm.end_data   = (unsigned long) &_edata;
 806         init_mm.brk        = (unsigned long) &_end;
 807
 808         memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 809         boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
 810         parse_cmdline(cmdline_p, from);
 811         paging_init(&meminfo, mdesc);
 812         request_standard_resources(&meminfo, mdesc);
 813
 814 #ifdef CONFIG_SMP
 815         smp_init_cpus();
 816 #endif
 817
 818         cpu_init();
 819
 820         /*
 821          * Set up various architecture-specific pointers
 822          */
 823         init_arch_irq = mdesc->init_irq;
 824         system_timer = mdesc->timer;
 825         init_machine = mdesc->init_machine;
 826
 827 #ifdef CONFIG_VT
 828 #if defined(CONFIG_VGA_CONSOLE)
 829         conswitchp = &vga_con;
 830 #elif defined(CONFIG_DUMMY_CONSOLE)
 831         conswitchp = &dummy_con;
 832 #endif
 833 #endif
 834         early_trap_init();
 835 }
 836
 837
 838 static int __init topology_init(void)
 839 {
 840         int cpu;
 841
 842         for_each_possible_cpu(cpu) {
 843                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 844                 cpuinfo->cpu.hotpluggable = 1;
 845                 register_cpu(&cpuinfo->cpu, cpu);
 846         }
 847
 848         return 0;
 849 }
 850
 851 subsys_initcall(topology_init);
 852
 853 static const char *hwcap_str[] = {
 854         "swp",
 855         "half",
 856         "thumb",
 857         "26bit",
 858         "fastmult",
 859         "fpa",
 860         "vfp",
 861         "edsp",
 862         "java",
 863         "iwmmxt",
 864         "crunch",
 865         NULL
 866 };
 867
 868 static void
 869 c_show_cache(struct seq_file *m, const char *type, unsigned int cache)
 870 {
 871         unsigned int mult = 2 + (CACHE_M(cache) ? 1 : 0);
 872
 873         seq_printf(m, "%s size\t\t: %d\n"
 874                       "%s assoc\t\t: %d\n"
 875                       "%s line length\t: %d\n"
 876                       "%s sets\t\t: %d\n",
 877                 type, mult << (8 + CACHE_SIZE(cache)),
 878                 type, (mult << CACHE_ASSOC(cache)) >> 1,
 879                 type, 8 << CACHE_LINE(cache),
 880                 type, 1 << (6 + CACHE_SIZE(cache) - CACHE_ASSOC(cache) -
 881                             CACHE_LINE(cache)));
 882 }
 883
 884 static int c_show(struct seq_file *m, void *v)
 885 {
 886         int i;
 887
 888         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
 889                    cpu_name, read_cpuid_id() & 15, elf_platform);
 890
 891 #if defined(CONFIG_SMP)
 892         for_each_online_cpu(i) {
 893                 /*
 894                  * glibc reads /proc/cpuinfo to determine the number of
 895                  * online processors, looking for lines beginning with
 896                  * "processor".  Give glibc what it expects.
 897                  */
 898                 seq_printf(m, "processor\t: %d\n", i);
 899                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
 900                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
 901                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
 902         }
 903 #else /* CONFIG_SMP */
 904         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
 905                    loops_per_jiffy / (500000/HZ),
 906                    (loops_per_jiffy / (5000/HZ)) % 100);
 907 #endif
 908
 909         /* dump out the processor features */
 910         seq_puts(m, "Features\t: ");
 911
 912         for (i = 0; hwcap_str[i]; i++)
 913                 if (elf_hwcap & (1 << i))
 914                         seq_printf(m, "%s ", hwcap_str[i]);
 915
 916         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
 917         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
 918
 919         if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
 920                 /* pre-ARM7 */
 921                 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
 922         } else {
 923                 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 924                         /* ARM7 */
 925                         seq_printf(m, "CPU variant\t: 0x%02x\n",
 926                                    (read_cpuid_id() >> 16) & 127);
 927                 } else {
 928                         /* post-ARM7 */
 929                         seq_printf(m, "CPU variant\t: 0x%x\n",
 930                                    (read_cpuid_id() >> 20) & 15);
 931                 }
 932                 seq_printf(m, "CPU part\t: 0x%03x\n",
 933                            (read_cpuid_id() >> 4) & 0xfff);
 934         }
 935         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
 936
 937         {
 938                 unsigned int cache_info = read_cpuid_cachetype();
 939                 if (cache_info != read_cpuid_id()) {
 940                         seq_printf(m, "Cache type\t: %s\n"
 941                                       "Cache clean\t: %s\n"
 942                                       "Cache lockdown\t: %s\n"
 943                                       "Cache format\t: %s\n",
 944                                    cache_types[CACHE_TYPE(cache_info)],
 945                                    cache_clean[CACHE_TYPE(cache_info)],
 946                                    cache_lockdown[CACHE_TYPE(cache_info)],
 947                                    CACHE_S(cache_info) ? "Harvard" : "Unified");
 948
 949                         if (CACHE_S(cache_info)) {
 950                                 c_show_cache(m, "I", CACHE_ISIZE(cache_info));
 951                                 c_show_cache(m, "D", CACHE_DSIZE(cache_info));
 952                         } else {
 953                                 c_show_cache(m, "Cache", CACHE_ISIZE(cache_info));
 954                         }
 955                 }
 956         }
 957
 958         seq_puts(m, "\n");
 959
 960         seq_printf(m, "Hardware\t: %s\n", machine_name);
 961         seq_printf(m, "Revision\t: %04x\n", system_rev);
 962         seq_printf(m, "Serial\t\t: %08x%08x\n",
 963                    system_serial_high, system_serial_low);
 964
 965         return 0;
 966 }
 967
 968 static void *c_start(struct seq_file *m, loff_t *pos)
 969 {
 970         return *pos < 1 ? (void *)1 : NULL;
 971 }
 972
 973 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 974 {
 975         ++*pos;
 976         return NULL;
 977 }
 978
 979 static void c_stop(struct seq_file *m, void *v)
 980 {
 981 }
 982
 983 const struct seq_operations cpuinfo_op = {
 984         .start  = c_start,
 985         .next   = c_next,
 986         .stop   = c_stop,
 987         .show   = c_show
 988 };