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/kexec.h>
  23 #include <linux/of_fdt.h>
  24 #include <linux/crash_dump.h>
  25 #include <linux/root_dev.h>
  26 #include <linux/cpu.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/smp.h>
  29 #include <linux/fs.h>
  30 #include <linux/proc_fs.h>
  31 #include <linux/memblock.h>
  32
  33 #include <asm/unified.h>
  34 #include <asm/cpu.h>
  35 #include <asm/cputype.h>
  36 #include <asm/elf.h>
  37 #include <asm/procinfo.h>
  38 #include <asm/sections.h>
  39 #include <asm/setup.h>
  40 #include <asm/smp_plat.h>
  41 #include <asm/mach-types.h>
  42 #include <asm/cacheflush.h>
  43 #include <asm/cachetype.h>
  44 #include <asm/tlbflush.h>
  45
  46 #include <asm/prom.h>
  47 #include <asm/mach/arch.h>
  48 #include <asm/mach/irq.h>
  49 #include <asm/mach/time.h>
  50 #include <asm/traps.h>
  51 #include <asm/unwind.h>
  52
  53 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
  54 #include "compat.h"
  55 #endif
  56 #include "atags.h"
  57 #include "tcm.h"
  58
  59 #ifndef MEM_SIZE
  60 #define MEM_SIZE        (16*1024*1024)
  61 #endif
  62
  63 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
  64 char fpe_type[8];
  65
  66 static int __init fpe_setup(char *line)
  67 {
  68         memcpy(fpe_type, line, 8);
  69         return 1;
  70 }
  71
  72 __setup("fpe=", fpe_setup);
  73 #endif
  74
  75 extern void paging_init(struct machine_desc *desc);
  76 extern void sanity_check_meminfo(void);
  77 extern void reboot_setup(char *str);
  78
  79 unsigned int processor_id;
  80 EXPORT_SYMBOL(processor_id);
  81 unsigned int __machine_arch_type __read_mostly;
  82 EXPORT_SYMBOL(__machine_arch_type);
  83 unsigned int cacheid __read_mostly;
  84 EXPORT_SYMBOL(cacheid);
  85
  86 unsigned int __atags_pointer __initdata;
  87
  88 unsigned int system_rev;
  89 EXPORT_SYMBOL(system_rev);
  90
  91 unsigned int system_serial_low;
  92 EXPORT_SYMBOL(system_serial_low);
  93
  94 unsigned int system_serial_high;
  95 EXPORT_SYMBOL(system_serial_high);
  96
  97 unsigned int elf_hwcap __read_mostly;
  98 EXPORT_SYMBOL(elf_hwcap);
  99
 100
 101 #ifdef MULTI_CPU
 102 struct processor processor __read_mostly;
 103 #endif
 104 #ifdef MULTI_TLB
 105 struct cpu_tlb_fns cpu_tlb __read_mostly;
 106 #endif
 107 #ifdef MULTI_USER
 108 struct cpu_user_fns cpu_user __read_mostly;
 109 #endif
 110 #ifdef MULTI_CACHE
 111 struct cpu_cache_fns cpu_cache __read_mostly;
 112 #endif
 113 #ifdef CONFIG_OUTER_CACHE
 114 struct outer_cache_fns outer_cache __read_mostly;
 115 EXPORT_SYMBOL(outer_cache);
 116 #endif
 117
 118 struct stack {
 119         u32 irq[3];
 120         u32 abt[3];
 121         u32 und[3];
 122 } ____cacheline_aligned;
 123
 124 static struct stack stacks[NR_CPUS];
 125
 126 char elf_platform[ELF_PLATFORM_SIZE];
 127 EXPORT_SYMBOL(elf_platform);
 128
 129 static const char *cpu_name;
 130 static const char *machine_name;
 131 static char __initdata cmd_line[COMMAND_LINE_SIZE];
 132 struct machine_desc *machine_desc __initdata;
 133
 134 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
 135 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
 136 #define ENDIANNESS ((char)endian_test.l)
 137
 138 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
 139
 140 /*
 141  * Standard memory resources
 142  */
 143 static struct resource mem_res[] = {
 144         {
 145                 .name = "Video RAM",
 146                 .start = 0,
 147                 .end = 0,
 148                 .flags = IORESOURCE_MEM
 149         },
 150         {
 151                 .name = "Kernel text",
 152                 .start = 0,
 153                 .end = 0,
 154                 .flags = IORESOURCE_MEM
 155         },
 156         {
 157                 .name = "Kernel data",
 158                 .start = 0,
 159                 .end = 0,
 160                 .flags = IORESOURCE_MEM
 161         }
 162 };
 163
 164 #define video_ram   mem_res[0]
 165 #define kernel_code mem_res[1]
 166 #define kernel_data mem_res[2]
 167
 168 static struct resource io_res[] = {
 169         {
 170                 .name = "reserved",
 171                 .start = 0x3bc,
 172                 .end = 0x3be,
 173                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 174         },
 175         {
 176                 .name = "reserved",
 177                 .start = 0x378,
 178                 .end = 0x37f,
 179                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 180         },
 181         {
 182                 .name = "reserved",
 183                 .start = 0x278,
 184                 .end = 0x27f,
 185                 .flags = IORESOURCE_IO | IORESOURCE_BUSY
 186         }
 187 };
 188
 189 #define lp0 io_res[0]
 190 #define lp1 io_res[1]
 191 #define lp2 io_res[2]
 192
 193 static const char *proc_arch[] = {
 194         "undefined/unknown",
 195         "3",
 196         "4",
 197         "4T",
 198         "5",
 199         "5T",
 200         "5TE",
 201         "5TEJ",
 202         "6TEJ",
 203         "7",
 204         "?(11)",
 205         "?(12)",
 206         "?(13)",
 207         "?(14)",
 208         "?(15)",
 209         "?(16)",
 210         "?(17)",
 211 };
 212
 213 int cpu_architecture(void)
 214 {
 215         int cpu_arch;
 216
 217         if ((read_cpuid_id() & 0x0008f000) == 0) {
 218                 cpu_arch = CPU_ARCH_UNKNOWN;
 219         } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
 220                 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
 221         } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
 222                 cpu_arch = (read_cpuid_id() >> 16) & 7;
 223                 if (cpu_arch)
 224                         cpu_arch += CPU_ARCH_ARMv3;
 225         } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
 226                 unsigned int mmfr0;
 227
 228                 /* Revised CPUID format. Read the Memory Model Feature
 229                  * Register 0 and check for VMSAv7 or PMSAv7 */
 230                 asm("mrc        p15, 0, %0, c0, c1, 4"
 231                     : "=r" (mmfr0));
 232                 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
 233                     (mmfr0 & 0x000000f0) >= 0x00000030)
 234                         cpu_arch = CPU_ARCH_ARMv7;
 235                 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
 236                          (mmfr0 & 0x000000f0) == 0x00000020)
 237                         cpu_arch = CPU_ARCH_ARMv6;
 238                 else
 239                         cpu_arch = CPU_ARCH_UNKNOWN;
 240         } else
 241                 cpu_arch = CPU_ARCH_UNKNOWN;
 242
 243         return cpu_arch;
 244 }
 245
 246 static int cpu_has_aliasing_icache(unsigned int arch)
 247 {
 248         int aliasing_icache;
 249         unsigned int id_reg, num_sets, line_size;
 250
 251         /* arch specifies the register format */
 252         switch (arch) {
 253         case CPU_ARCH_ARMv7:
 254                 asm("mcr        p15, 2, %0, c0, c0, 0 @ set CSSELR"
 255                     : /* No output operands */
 256                     : "r" (1));
 257                 isb();
 258                 asm("mrc        p15, 1, %0, c0, c0, 0 @ read CCSIDR"
 259                     : "=r" (id_reg));
 260                 line_size = 4 << ((id_reg & 0x7) + 2);
 261                 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
 262                 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
 263                 break;
 264         case CPU_ARCH_ARMv6:
 265                 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
 266                 break;
 267         default:
 268                 /* I-cache aliases will be handled by D-cache aliasing code */
 269                 aliasing_icache = 0;
 270         }
 271
 272         return aliasing_icache;
 273 }
 274
 275 static void __init cacheid_init(void)
 276 {
 277         unsigned int cachetype = read_cpuid_cachetype();
 278         unsigned int arch = cpu_architecture();
 279
 280         if (arch >= CPU_ARCH_ARMv6) {
 281                 if ((cachetype & (7 << 29)) == 4 << 29) {
 282                         /* ARMv7 register format */
 283                         arch = CPU_ARCH_ARMv7;
 284                         cacheid = CACHEID_VIPT_NONALIASING;
 285                         if ((cachetype & (3 << 14)) == 1 << 14)
 286                                 cacheid |= CACHEID_ASID_TAGGED;
 287                 } else {
 288                         arch = CPU_ARCH_ARMv6;
 289                         if (cachetype & (1 << 23))
 290                                 cacheid = CACHEID_VIPT_ALIASING;
 291                         else
 292                                 cacheid = CACHEID_VIPT_NONALIASING;
 293                 }
 294                 if (cpu_has_aliasing_icache(arch))
 295                         cacheid |= CACHEID_VIPT_I_ALIASING;
 296         } else {
 297                 cacheid = CACHEID_VIVT;
 298         }
 299
 300         printk("CPU: %s data cache, %s instruction cache\n",
 301                 cache_is_vivt() ? "VIVT" :
 302                 cache_is_vipt_aliasing() ? "VIPT aliasing" :
 303                 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown",
 304                 cache_is_vivt() ? "VIVT" :
 305                 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
 306                 icache_is_vipt_aliasing() ? "VIPT aliasing" :
 307                 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
 308 }
 309
 310 /*
 311  * These functions re-use the assembly code in head.S, which
 312  * already provide the required functionality.
 313  */
 314 extern struct proc_info_list *lookup_processor_type(unsigned int);
 315
 316 void __init early_print(const char *str, ...)
 317 {
 318         extern void printascii(const char *);
 319         char buf[256];
 320         va_list ap;
 321
 322         va_start(ap, str);
 323         vsnprintf(buf, sizeof(buf), str, ap);
 324         va_end(ap);
 325
 326 #ifdef CONFIG_DEBUG_LL
 327         printascii(buf);
 328 #endif
 329         printk("%s", buf);
 330 }
 331
 332 static void __init feat_v6_fixup(void)
 333 {
 334         int id = read_cpuid_id();
 335
 336         if ((id & 0xff0f0000) != 0x41070000)
 337                 return;
 338
 339         /*
 340          * HWCAP_TLS is available only on 1136 r1p0 and later,
 341          * see also kuser_get_tls_init.
 342          */
 343         if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0))
 344                 elf_hwcap &= ~HWCAP_TLS;
 345 }
 346
 347 /*
 348  * cpu_init - initialise one CPU.
 349  *
 350  * cpu_init sets up the per-CPU stacks.
 351  */
 352 void cpu_init(void)
 353 {
 354         unsigned int cpu = smp_processor_id();
 355         struct stack *stk = &stacks[cpu];
 356
 357         if (cpu >= NR_CPUS) {
 358                 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu);
 359                 BUG();
 360         }
 361
 362         cpu_proc_init();
 363
 364         /*
 365          * Define the placement constraint for the inline asm directive below.
 366          * In Thumb-2, msr with an immediate value is not allowed.
 367          */
 368 #ifdef CONFIG_THUMB2_KERNEL
 369 #define PLC     "r"
 370 #else
 371 #define PLC     "I"
 372 #endif
 373
 374         /*
 375          * setup stacks for re-entrant exception handlers
 376          */
 377         __asm__ (
 378         "msr    cpsr_c, %1\n\t"
 379         "add    r14, %0, %2\n\t"
 380         "mov    sp, r14\n\t"
 381         "msr    cpsr_c, %3\n\t"
 382         "add    r14, %0, %4\n\t"
 383         "mov    sp, r14\n\t"
 384         "msr    cpsr_c, %5\n\t"
 385         "add    r14, %0, %6\n\t"
 386         "mov    sp, r14\n\t"
 387         "msr    cpsr_c, %7"
 388             :
 389             : "r" (stk),
 390               PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
 391               "I" (offsetof(struct stack, irq[0])),
 392               PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
 393               "I" (offsetof(struct stack, abt[0])),
 394               PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE),
 395               "I" (offsetof(struct stack, und[0])),
 396               PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
 397             : "r14");
 398 }
 399
 400 static void __init setup_processor(void)
 401 {
 402         struct proc_info_list *list;
 403
 404         /*
 405          * locate processor in the list of supported processor
 406          * types.  The linker builds this table for us from the
 407          * entries in arch/arm/mm/proc-*.S
 408          */
 409         list = lookup_processor_type(read_cpuid_id());
 410         if (!list) {
 411                 printk("CPU configuration botched (ID %08x), unable "
 412                        "to continue.\n", read_cpuid_id());
 413                 while (1);
 414         }
 415
 416         cpu_name = list->cpu_name;
 417
 418 #ifdef MULTI_CPU
 419         processor = *list->proc;
 420 #endif
 421 #ifdef MULTI_TLB
 422         cpu_tlb = *list->tlb;
 423 #endif
 424 #ifdef MULTI_USER
 425         cpu_user = *list->user;
 426 #endif
 427 #ifdef MULTI_CACHE
 428         cpu_cache = *list->cache;
 429 #endif
 430
 431         printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
 432                cpu_name, read_cpuid_id(), read_cpuid_id() & 15,
 433                proc_arch[cpu_architecture()], cr_alignment);
 434
 435         sprintf(init_utsname()->machine, "%s%c", list->arch_name, ENDIANNESS);
 436         sprintf(elf_platform, "%s%c", list->elf_name, ENDIANNESS);
 437         elf_hwcap = list->elf_hwcap;
 438 #ifndef CONFIG_ARM_THUMB
 439         elf_hwcap &= ~HWCAP_THUMB;
 440 #endif
 441
 442         feat_v6_fixup();
 443
 444         cacheid_init();
 445         cpu_init();
 446 }
 447
 448 void __init dump_machine_table(void)
 449 {
 450         struct machine_desc *p;
 451
 452         early_print("Available machine support:\n\nID (hex)\tNAME\n");
 453         for_each_machine_desc(p)
 454                 early_print("%08x\t%s\n", p->nr, p->name);
 455
 456         early_print("\nPlease check your kernel config and/or bootloader.\n");
 457
 458         while (true)
 459                 /* can't use cpu_relax() here as it may require MMU setup */;
 460 }
 461
 462 int __init arm_add_memory(phys_addr_t start, unsigned long size)
 463 {
 464         struct membank *bank = &meminfo.bank[meminfo.nr_banks];
 465
 466         if (meminfo.nr_banks >= NR_BANKS) {
 467                 printk(KERN_CRIT "NR_BANKS too low, "
 468                         "ignoring memory at 0x%08llx\n", (long long)start);
 469                 return -EINVAL;
 470         }
 471
 472         /*
 473          * Ensure that start/size are aligned to a page boundary.
 474          * Size is appropriately rounded down, start is rounded up.
 475          */
 476         size -= start & ~PAGE_MASK;
 477         bank->start = PAGE_ALIGN(start);
 478         bank->size  = size & PAGE_MASK;
 479
 480         /*
 481          * Check whether this memory region has non-zero size or
 482          * invalid node number.
 483          */
 484         if (bank->size == 0)
 485                 return -EINVAL;
 486
 487         meminfo.nr_banks++;
 488         return 0;
 489 }
 490
 491 /*
 492  * Pick out the memory size.  We look for mem=size@start,
 493  * where start and size are "size[KkMm]"
 494  */
 495 static int __init early_mem(char *p)
 496 {
 497         static int usermem __initdata = 0;
 498         unsigned long size;
 499         phys_addr_t start;
 500         char *endp;
 501
 502         /*
 503          * If the user specifies memory size, we
 504          * blow away any automatically generated
 505          * size.
 506          */
 507         if (usermem == 0) {
 508                 usermem = 1;
 509                 meminfo.nr_banks = 0;
 510         }
 511
 512         start = PHYS_OFFSET;
 513         size  = memparse(p, &endp);
 514         if (*endp == '@')
 515                 start = memparse(endp + 1, NULL);
 516
 517         arm_add_memory(start, size);
 518
 519         return 0;
 520 }
 521 early_param("mem", early_mem);
 522
 523 static void __init
 524 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz)
 525 {
 526 #ifdef CONFIG_BLK_DEV_RAM
 527         extern int rd_size, rd_image_start, rd_prompt, rd_doload;
 528
 529         rd_image_start = image_start;
 530         rd_prompt = prompt;
 531         rd_doload = doload;
 532
 533         if (rd_sz)
 534                 rd_size = rd_sz;
 535 #endif
 536 }
 537
 538 static void __init request_standard_resources(struct machine_desc *mdesc)
 539 {
 540         struct memblock_region *region;
 541         struct resource *res;
 542
 543         kernel_code.start   = virt_to_phys(_text);
 544         kernel_code.end     = virt_to_phys(_etext - 1);
 545         kernel_data.start   = virt_to_phys(_sdata);
 546         kernel_data.end     = virt_to_phys(_end - 1);
 547
 548         for_each_memblock(memory, region) {
 549                 res = alloc_bootmem_low(sizeof(*res));
 550                 res->name  = "System RAM";
 551                 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region));
 552                 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1;
 553                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 554
 555                 request_resource(&iomem_resource, res);
 556
 557                 if (kernel_code.start >= res->start &&
 558                     kernel_code.end <= res->end)
 559                         request_resource(res, &kernel_code);
 560                 if (kernel_data.start >= res->start &&
 561                     kernel_data.end <= res->end)
 562                         request_resource(res, &kernel_data);
 563         }
 564
 565         if (mdesc->video_start) {
 566                 video_ram.start = mdesc->video_start;
 567                 video_ram.end   = mdesc->video_end;
 568                 request_resource(&iomem_resource, &video_ram);
 569         }
 570
 571         /*
 572          * Some machines don't have the possibility of ever
 573          * possessing lp0, lp1 or lp2
 574          */
 575         if (mdesc->reserve_lp0)
 576                 request_resource(&ioport_resource, &lp0);
 577         if (mdesc->reserve_lp1)
 578                 request_resource(&ioport_resource, &lp1);
 579         if (mdesc->reserve_lp2)
 580                 request_resource(&ioport_resource, &lp2);
 581 }
 582
 583 /*
 584  *  Tag parsing.
 585  *
 586  * This is the new way of passing data to the kernel at boot time.  Rather
 587  * than passing a fixed inflexible structure to the kernel, we pass a list
 588  * of variable-sized tags to the kernel.  The first tag must be a ATAG_CORE
 589  * tag for the list to be recognised (to distinguish the tagged list from
 590  * a param_struct).  The list is terminated with a zero-length tag (this tag
 591  * is not parsed in any way).
 592  */
 593 static int __init parse_tag_core(const struct tag *tag)
 594 {
 595         if (tag->hdr.size > 2) {
 596                 if ((tag->u.core.flags & 1) == 0)
 597                         root_mountflags &= ~MS_RDONLY;
 598                 ROOT_DEV = old_decode_dev(tag->u.core.rootdev);
 599         }
 600         return 0;
 601 }
 602
 603 __tagtable(ATAG_CORE, parse_tag_core);
 604
 605 static int __init parse_tag_mem32(const struct tag *tag)
 606 {
 607         return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
 608 }
 609
 610 __tagtable(ATAG_MEM, parse_tag_mem32);
 611
 612 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
 613 struct screen_info screen_info = {
 614  .orig_video_lines      = 30,
 615  .orig_video_cols       = 80,
 616  .orig_video_mode       = 0,
 617  .orig_video_ega_bx     = 0,
 618  .orig_video_isVGA      = 1,
 619  .orig_video_points     = 8
 620 };
 621
 622 static int __init parse_tag_videotext(const struct tag *tag)
 623 {
 624         screen_info.orig_x            = tag->u.videotext.x;
 625         screen_info.orig_y            = tag->u.videotext.y;
 626         screen_info.orig_video_page   = tag->u.videotext.video_page;
 627         screen_info.orig_video_mode   = tag->u.videotext.video_mode;
 628         screen_info.orig_video_cols   = tag->u.videotext.video_cols;
 629         screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx;
 630         screen_info.orig_video_lines  = tag->u.videotext.video_lines;
 631         screen_info.orig_video_isVGA  = tag->u.videotext.video_isvga;
 632         screen_info.orig_video_points = tag->u.videotext.video_points;
 633         return 0;
 634 }
 635
 636 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext);
 637 #endif
 638
 639 static int __init parse_tag_ramdisk(const struct tag *tag)
 640 {
 641         setup_ramdisk((tag->u.ramdisk.flags & 1) == 0,
 642                       (tag->u.ramdisk.flags & 2) == 0,
 643                       tag->u.ramdisk.start, tag->u.ramdisk.size);
 644         return 0;
 645 }
 646
 647 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk);
 648
 649 static int __init parse_tag_serialnr(const struct tag *tag)
 650 {
 651         system_serial_low = tag->u.serialnr.low;
 652         system_serial_high = tag->u.serialnr.high;
 653         return 0;
 654 }
 655
 656 __tagtable(ATAG_SERIAL, parse_tag_serialnr);
 657
 658 static int __init parse_tag_revision(const struct tag *tag)
 659 {
 660         system_rev = tag->u.revision.rev;
 661         return 0;
 662 }
 663
 664 __tagtable(ATAG_REVISION, parse_tag_revision);
 665
 666 static int __init parse_tag_cmdline(const struct tag *tag)
 667 {
 668 #if defined(CONFIG_CMDLINE_EXTEND)
 669         strlcat(default_command_line, " ", COMMAND_LINE_SIZE);
 670         strlcat(default_command_line, tag->u.cmdline.cmdline,
 671                 COMMAND_LINE_SIZE);
 672 #elif defined(CONFIG_CMDLINE_FORCE)
 673         pr_warning("Ignoring tag cmdline (using the default kernel command line)\n");
 674 #else
 675         strlcpy(default_command_line, tag->u.cmdline.cmdline,
 676                 COMMAND_LINE_SIZE);
 677 #endif
 678         return 0;
 679 }
 680
 681 __tagtable(ATAG_CMDLINE, parse_tag_cmdline);
 682
 683 /*
 684  * Scan the tag table for this tag, and call its parse function.
 685  * The tag table is built by the linker from all the __tagtable
 686  * declarations.
 687  */
 688 static int __init parse_tag(const struct tag *tag)
 689 {
 690         extern struct tagtable __tagtable_begin, __tagtable_end;
 691         struct tagtable *t;
 692
 693         for (t = &__tagtable_begin; t < &__tagtable_end; t++)
 694                 if (tag->hdr.tag == t->tag) {
 695                         t->parse(tag);
 696                         break;
 697                 }
 698
 699         return t < &__tagtable_end;
 700 }
 701
 702 /*
 703  * Parse all tags in the list, checking both the global and architecture
 704  * specific tag tables.
 705  */
 706 static void __init parse_tags(const struct tag *t)
 707 {
 708         for (; t->hdr.size; t = tag_next(t))
 709                 if (!parse_tag(t))
 710                         printk(KERN_WARNING
 711                                 "Ignoring unrecognised tag 0x%08x\n",
 712                                 t->hdr.tag);
 713 }
 714
 715 /*
 716  * This holds our defaults.
 717  */
 718 static struct init_tags {
 719         struct tag_header hdr1;
 720         struct tag_core   core;
 721         struct tag_header hdr2;
 722         struct tag_mem32  mem;
 723         struct tag_header hdr3;
 724 } init_tags __initdata = {
 725         { tag_size(tag_core), ATAG_CORE },
 726         { 1, PAGE_SIZE, 0xff },
 727         { tag_size(tag_mem32), ATAG_MEM },
 728         { MEM_SIZE },
 729         { 0, ATAG_NONE }
 730 };
 731
 732 static int __init customize_machine(void)
 733 {
 734         /* customizes platform devices, or adds new ones */
 735         if (machine_desc->init_machine)
 736                 machine_desc->init_machine();
 737         return 0;
 738 }
 739 arch_initcall(customize_machine);
 740
 741 #ifdef CONFIG_KEXEC
 742 static inline unsigned long long get_total_mem(void)
 743 {
 744         unsigned long total;
 745
 746         total = max_low_pfn - min_low_pfn;
 747         return total << PAGE_SHIFT;
 748 }
 749
 750 /**
 751  * reserve_crashkernel() - reserves memory are for crash kernel
 752  *
 753  * This function reserves memory area given in "crashkernel=" kernel command
 754  * line parameter. The memory reserved is used by a dump capture kernel when
 755  * primary kernel is crashing.
 756  */
 757 static void __init reserve_crashkernel(void)
 758 {
 759         unsigned long long crash_size, crash_base;
 760         unsigned long long total_mem;
 761         int ret;
 762
 763         total_mem = get_total_mem();
 764         ret = parse_crashkernel(boot_command_line, total_mem,
 765                                 &crash_size, &crash_base);
 766         if (ret)
 767                 return;
 768
 769         ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE);
 770         if (ret < 0) {
 771                 printk(KERN_WARNING "crashkernel reservation failed - "
 772                        "memory is in use (0x%lx)\n", (unsigned long)crash_base);
 773                 return;
 774         }
 775
 776         printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
 777                "for crashkernel (System RAM: %ldMB)\n",
 778                (unsigned long)(crash_size >> 20),
 779                (unsigned long)(crash_base >> 20),
 780                (unsigned long)(total_mem >> 20));
 781
 782         crashk_res.start = crash_base;
 783         crashk_res.end = crash_base + crash_size - 1;
 784         insert_resource(&iomem_resource, &crashk_res);
 785 }
 786 #else
 787 static inline void reserve_crashkernel(void) {}
 788 #endif /* CONFIG_KEXEC */
 789
 790 static void __init squash_mem_tags(struct tag *tag)
 791 {
 792         for (; tag->hdr.size; tag = tag_next(tag))
 793                 if (tag->hdr.tag == ATAG_MEM)
 794                         tag->hdr.tag = ATAG_NONE;
 795 }
 796
 797 static struct machine_desc * __init setup_machine_tags(unsigned int nr)
 798 {
 799         struct tag *tags = (struct tag *)&init_tags;
 800         struct machine_desc *mdesc = NULL, *p;
 801         char *from = default_command_line;
 802
 803         init_tags.mem.start = PHYS_OFFSET;
 804
 805         /*
 806          * locate machine in the list of supported machines.
 807          */
 808         for_each_machine_desc(p)
 809                 if (nr == p->nr) {
 810                         printk("Machine: %s\n", p->name);
 811                         mdesc = p;
 812                         break;
 813                 }
 814
 815         if (!mdesc) {
 816                 early_print("\nError: unrecognized/unsupported machine ID"
 817                         " (r1 = 0x%08x).\n\n", nr);
 818                 dump_machine_table(); /* does not return */
 819         }
 820
 821         if (__atags_pointer)
 822                 tags = phys_to_virt(__atags_pointer);
 823         else if (mdesc->boot_params) {
 824 #ifdef CONFIG_MMU
 825                 /*
 826                  * We still are executing with a minimal MMU mapping created
 827                  * with the presumption that the machine default for this
 828                  * is located in the first MB of RAM.  Anything else will
 829                  * fault and silently hang the kernel at this point.
 830                  */
 831                 if (mdesc->boot_params < PHYS_OFFSET ||
 832                     mdesc->boot_params >= PHYS_OFFSET + SZ_1M) {
 833                         printk(KERN_WARNING
 834                                "Default boot params at physical 0x%08lx out of reach\n",
 835                                mdesc->boot_params);
 836                 } else
 837 #endif
 838                 {
 839                         tags = phys_to_virt(mdesc->boot_params);
 840                 }
 841         }
 842
 843 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
 844         /*
 845          * If we have the old style parameters, convert them to
 846          * a tag list.
 847          */
 848         if (tags->hdr.tag != ATAG_CORE)
 849                 convert_to_tag_list(tags);
 850 #endif
 851
 852         if (tags->hdr.tag != ATAG_CORE) {
 853 #if defined(CONFIG_OF)
 854                 /*
 855                  * If CONFIG_OF is set, then assume this is a reasonably
 856                  * modern system that should pass boot parameters
 857                  */
 858                 early_print("Warning: Neither atags nor dtb found\n");
 859 #endif
 860                 tags = (struct tag *)&init_tags;
 861         }
 862
 863         if (mdesc->fixup)
 864                 mdesc->fixup(mdesc, tags, &from, &meminfo);
 865
 866         if (tags->hdr.tag == ATAG_CORE) {
 867                 if (meminfo.nr_banks != 0)
 868                         squash_mem_tags(tags);
 869                 save_atags(tags);
 870                 parse_tags(tags);
 871         }
 872
 873         /* parse_early_param needs a boot_command_line */
 874         strlcpy(boot_command_line, from, COMMAND_LINE_SIZE);
 875
 876         return mdesc;
 877 }
 878
 879
 880 void __init setup_arch(char **cmdline_p)
 881 {
 882         struct machine_desc *mdesc;
 883
 884         unwind_init();
 885
 886         setup_processor();
 887         mdesc = setup_machine_fdt(__atags_pointer);
 888         if (!mdesc)
 889                 mdesc = setup_machine_tags(machine_arch_type);
 890         machine_desc = mdesc;
 891         machine_name = mdesc->name;
 892
 893         if (mdesc->soft_reboot)
 894                 reboot_setup("s");
 895
 896         init_mm.start_code = (unsigned long) _text;
 897         init_mm.end_code   = (unsigned long) _etext;
 898         init_mm.end_data   = (unsigned long) _edata;
 899         init_mm.brk        = (unsigned long) _end;
 900
 901         /* populate cmd_line too for later use, preserving boot_command_line */
 902         strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
 903         *cmdline_p = cmd_line;
 904
 905         parse_early_param();
 906
 907         sanity_check_meminfo();
 908         arm_memblock_init(&meminfo, mdesc);
 909
 910         paging_init(mdesc);
 911         request_standard_resources(mdesc);
 912
 913         unflatten_device_tree();
 914
 915 #ifdef CONFIG_SMP
 916         if (is_smp())
 917                 smp_init_cpus();
 918 #endif
 919         reserve_crashkernel();
 920
 921         tcm_init();
 922
 923 #ifdef CONFIG_ZONE_DMA
 924         if (mdesc->dma_zone_size) {
 925                 extern unsigned long arm_dma_zone_size;
 926                 arm_dma_zone_size = mdesc->dma_zone_size;
 927         }
 928 #endif
 929 #ifdef CONFIG_MULTI_IRQ_HANDLER
 930         handle_arch_irq = mdesc->handle_irq;
 931 #endif
 932
 933 #ifdef CONFIG_VT
 934 #if defined(CONFIG_VGA_CONSOLE)
 935         conswitchp = &vga_con;
 936 #elif defined(CONFIG_DUMMY_CONSOLE)
 937         conswitchp = &dummy_con;
 938 #endif
 939 #endif
 940         early_trap_init();
 941
 942         if (mdesc->init_early)
 943                 mdesc->init_early();
 944 }
 945
 946
 947 static int __init topology_init(void)
 948 {
 949         int cpu;
 950
 951         for_each_possible_cpu(cpu) {
 952                 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu);
 953                 cpuinfo->cpu.hotpluggable = 1;
 954                 register_cpu(&cpuinfo->cpu, cpu);
 955         }
 956
 957         return 0;
 958 }
 959 subsys_initcall(topology_init);
 960
 961 #ifdef CONFIG_HAVE_PROC_CPU
 962 static int __init proc_cpu_init(void)
 963 {
 964         struct proc_dir_entry *res;
 965
 966         res = proc_mkdir("cpu", NULL);
 967         if (!res)
 968                 return -ENOMEM;
 969         return 0;
 970 }
 971 fs_initcall(proc_cpu_init);
 972 #endif
 973
 974 static const char *hwcap_str[] = {
 975         "swp",
 976         "half",
 977         "thumb",
 978         "26bit",
 979         "fastmult",
 980         "fpa",
 981         "vfp",
 982         "edsp",
 983         "java",
 984         "iwmmxt",
 985         "crunch",
 986         "thumbee",
 987         "neon",
 988         "vfpv3",
 989         "vfpv3d16",
 990         "tls",
 991         "vfpv4",
 992         "idiva",
 993         "idivt",
 994         NULL
 995 };
 996
 997 static int c_show(struct seq_file *m, void *v)
 998 {
 999         int i;
1000
1001         seq_printf(m, "Processor\t: %s rev %d (%s)\n",
1002                    cpu_name, read_cpuid_id() & 15, elf_platform);
1003
1004 #if defined(CONFIG_SMP)
1005         for_each_online_cpu(i) {
1006                 /*
1007                  * glibc reads /proc/cpuinfo to determine the number of
1008                  * online processors, looking for lines beginning with
1009                  * "processor".  Give glibc what it expects.
1010                  */
1011                 seq_printf(m, "processor\t: %d\n", i);
1012                 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n",
1013                            per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1014                            (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1015         }
1016 #else /* CONFIG_SMP */
1017         seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1018                    loops_per_jiffy / (500000/HZ),
1019                    (loops_per_jiffy / (5000/HZ)) % 100);
1020 #endif
1021
1022         /* dump out the processor features */
1023         seq_puts(m, "Features\t: ");
1024
1025         for (i = 0; hwcap_str[i]; i++)
1026                 if (elf_hwcap & (1 << i))
1027                         seq_printf(m, "%s ", hwcap_str[i]);
1028
1029         seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24);
1030         seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]);
1031
1032         if ((read_cpuid_id() & 0x0008f000) == 0x00000000) {
1033                 /* pre-ARM7 */
1034                 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4);
1035         } else {
1036                 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
1037                         /* ARM7 */
1038                         seq_printf(m, "CPU variant\t: 0x%02x\n",
1039                                    (read_cpuid_id() >> 16) & 127);
1040                 } else {
1041                         /* post-ARM7 */
1042                         seq_printf(m, "CPU variant\t: 0x%x\n",
1043                                    (read_cpuid_id() >> 20) & 15);
1044                 }
1045                 seq_printf(m, "CPU part\t: 0x%03x\n",
1046                            (read_cpuid_id() >> 4) & 0xfff);
1047         }
1048         seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15);
1049
1050         seq_puts(m, "\n");
1051
1052         seq_printf(m, "Hardware\t: %s\n", machine_name);
1053         seq_printf(m, "Revision\t: %04x\n", system_rev);
1054         seq_printf(m, "Serial\t\t: %08x%08x\n",
1055                    system_serial_high, system_serial_low);
1056
1057         return 0;
1058 }
1059
1060 static void *c_start(struct seq_file *m, loff_t *pos)
1061 {
1062         return *pos < 1 ? (void *)1 : NULL;
1063 }
1064
1065 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1066 {
1067         ++*pos;
1068         return NULL;
1069 }
1070
1071 static void c_stop(struct seq_file *m, void *v)
1072 {
1073 }
1074
1075 const struct seq_operations cpuinfo_op = {
1076         .start  = c_start,
1077         .next   = c_next,
1078         .stop   = c_stop,
1079         .show   = c_show
1080 };