arch/mips/kernel/setup.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 1995 Linus Torvalds
   7  * Copyright (C) 1995 Waldorf Electronics
   8  * Copyright (C) 1994, 95, 96, 97, 98, 99, 2000, 01, 02, 03  Ralf Baechle
   9  * Copyright (C) 1996 Stoned Elipot
  10  * Copyright (C) 1999 Silicon Graphics, Inc.
  11  * Copyright (C) 2000, 2001, 2002, 2007  Maciej W. Rozycki
  12  */
  13 #include <linux/init.h>
  14 #include <linux/ioport.h>
  15 #include <linux/export.h>
  16 #include <linux/screen_info.h>
  17 #include <linux/memblock.h>
  18 #include <linux/bootmem.h>
  19 #include <linux/initrd.h>
  20 #include <linux/root_dev.h>
  21 #include <linux/highmem.h>
  22 #include <linux/console.h>
  23 #include <linux/pfn.h>
  24 #include <linux/debugfs.h>
  25 #include <linux/kexec.h>
  26 #include <linux/sizes.h>
  27
  28 #include <asm/addrspace.h>
  29 #include <asm/bootinfo.h>
  30 #include <asm/bugs.h>
  31 #include <asm/cache.h>
  32 #include <asm/cpu.h>
  33 #include <asm/sections.h>
  34 #include <asm/setup.h>
  35 #include <asm/smp-ops.h>
  36 #include <asm/prom.h>
  37
  38 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  39
  40 EXPORT_SYMBOL(cpu_data);
  41
  42 #ifdef CONFIG_VT
  43 struct screen_info screen_info;
  44 #endif
  45
  46 /*
  47  * Despite it's name this variable is even if we don't have PCI
  48  */
  49 unsigned int PCI_DMA_BUS_IS_PHYS;
  50
  51 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  52
  53 /*
  54  * Setup information
  55  *
  56  * These are initialized so they are in the .data section
  57  */
  58 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  59
  60 EXPORT_SYMBOL(mips_machtype);
  61
  62 struct boot_mem_map boot_mem_map;
  63
  64 static char __initdata command_line[COMMAND_LINE_SIZE];
  65 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  66
  67 #ifdef CONFIG_CMDLINE_BOOL
  68 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  69 #endif
  70
  71 /*
  72  * mips_io_port_base is the begin of the address space to which x86 style
  73  * I/O ports are mapped.
  74  */
  75 const unsigned long mips_io_port_base = -1;
  76 EXPORT_SYMBOL(mips_io_port_base);
  77
  78 static struct resource code_resource = { .name = "Kernel code", };
  79 static struct resource data_resource = { .name = "Kernel data", };
  80
  81 static void *detect_magic __initdata = detect_memory_region;
  82
  83 void __init add_memory_region(phys_t start, phys_t size, long type)
  84 {
  85         int x = boot_mem_map.nr_map;
  86         int i;
  87
  88         /* Sanity check */
  89         if (start + size < start) {
  90                 pr_warning("Trying to add an invalid memory region, skipped\n");
  91                 return;
  92         }
  93
  94         /*
  95          * Try to merge with existing entry, if any.
  96          */
  97         for (i = 0; i < boot_mem_map.nr_map; i++) {
  98                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
  99                 unsigned long top;
 100
 101                 if (entry->type != type)
 102                         continue;
 103
 104                 if (start + size < entry->addr)
 105                         continue;                       /* no overlap */
 106
 107                 if (entry->addr + entry->size < start)
 108                         continue;                       /* no overlap */
 109
 110                 top = max(entry->addr + entry->size, start + size);
 111                 entry->addr = min(entry->addr, start);
 112                 entry->size = top - entry->addr;
 113
 114                 return;
 115         }
 116
 117         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 118                 pr_err("Ooops! Too many entries in the memory map!\n");
 119                 return;
 120         }
 121
 122         boot_mem_map.map[x].addr = start;
 123         boot_mem_map.map[x].size = size;
 124         boot_mem_map.map[x].type = type;
 125         boot_mem_map.nr_map++;
 126 }
 127
 128 void __init detect_memory_region(phys_t start, phys_t sz_min, phys_t sz_max)
 129 {
 130         void *dm = &detect_magic;
 131         phys_t size;
 132
 133         for (size = sz_min; size < sz_max; size <<= 1) {
 134                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 135                         break;
 136         }
 137
 138         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 139                 ((unsigned long long) size) / SZ_1M,
 140                 (unsigned long long) start,
 141                 ((unsigned long long) sz_min) / SZ_1M,
 142                 ((unsigned long long) sz_max) / SZ_1M);
 143
 144         add_memory_region(start, size, BOOT_MEM_RAM);
 145 }
 146
 147 static void __init print_memory_map(void)
 148 {
 149         int i;
 150         const int field = 2 * sizeof(unsigned long);
 151
 152         for (i = 0; i < boot_mem_map.nr_map; i++) {
 153                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 154                        field, (unsigned long long) boot_mem_map.map[i].size,
 155                        field, (unsigned long long) boot_mem_map.map[i].addr);
 156
 157                 switch (boot_mem_map.map[i].type) {
 158                 case BOOT_MEM_RAM:
 159                         printk(KERN_CONT "(usable)\n");
 160                         break;
 161                 case BOOT_MEM_INIT_RAM:
 162                         printk(KERN_CONT "(usable after init)\n");
 163                         break;
 164                 case BOOT_MEM_ROM_DATA:
 165                         printk(KERN_CONT "(ROM data)\n");
 166                         break;
 167                 case BOOT_MEM_RESERVED:
 168                         printk(KERN_CONT "(reserved)\n");
 169                         break;
 170                 default:
 171                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 172                         break;
 173                 }
 174         }
 175 }
 176
 177 /*
 178  * Manage initrd
 179  */
 180 #ifdef CONFIG_BLK_DEV_INITRD
 181
 182 static int __init rd_start_early(char *p)
 183 {
 184         unsigned long start = memparse(p, &p);
 185
 186 #ifdef CONFIG_64BIT
 187         /* Guess if the sign extension was forgotten by bootloader */
 188         if (start < XKPHYS)
 189                 start = (int)start;
 190 #endif
 191         initrd_start = start;
 192         initrd_end += start;
 193         return 0;
 194 }
 195 early_param("rd_start", rd_start_early);
 196
 197 static int __init rd_size_early(char *p)
 198 {
 199         initrd_end += memparse(p, &p);
 200         return 0;
 201 }
 202 early_param("rd_size", rd_size_early);
 203
 204 /* it returns the next free pfn after initrd */
 205 static unsigned long __init init_initrd(void)
 206 {
 207         unsigned long end;
 208
 209         /*
 210          * Board specific code or command line parser should have
 211          * already set up initrd_start and initrd_end. In these cases
 212          * perfom sanity checks and use them if all looks good.
 213          */
 214         if (!initrd_start || initrd_end <= initrd_start)
 215                 goto disable;
 216
 217         if (initrd_start & ~PAGE_MASK) {
 218                 pr_err("initrd start must be page aligned\n");
 219                 goto disable;
 220         }
 221         if (initrd_start < PAGE_OFFSET) {
 222                 pr_err("initrd start < PAGE_OFFSET\n");
 223                 goto disable;
 224         }
 225
 226         /*
 227          * Sanitize initrd addresses. For example firmware
 228          * can't guess if they need to pass them through
 229          * 64-bits values if the kernel has been built in pure
 230          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 231          * addresses now, so the code can now safely use __pa().
 232          */
 233         end = __pa(initrd_end);
 234         initrd_end = (unsigned long)__va(end);
 235         initrd_start = (unsigned long)__va(__pa(initrd_start));
 236
 237         ROOT_DEV = Root_RAM0;
 238         return PFN_UP(end);
 239 disable:
 240         initrd_start = 0;
 241         initrd_end = 0;
 242         return 0;
 243 }
 244
 245 static void __init finalize_initrd(void)
 246 {
 247         unsigned long size = initrd_end - initrd_start;
 248
 249         if (size == 0) {
 250                 printk(KERN_INFO "Initrd not found or empty");
 251                 goto disable;
 252         }
 253         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 254                 printk(KERN_ERR "Initrd extends beyond end of memory");
 255                 goto disable;
 256         }
 257
 258         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 259         initrd_below_start_ok = 1;
 260
 261         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 262                 initrd_start, size);
 263         return;
 264 disable:
 265         printk(KERN_CONT " - disabling initrd\n");
 266         initrd_start = 0;
 267         initrd_end = 0;
 268 }
 269
 270 #else  /* !CONFIG_BLK_DEV_INITRD */
 271
 272 static unsigned long __init init_initrd(void)
 273 {
 274         return 0;
 275 }
 276
 277 #define finalize_initrd()       do {} while (0)
 278
 279 #endif
 280
 281 /*
 282  * Initialize the bootmem allocator. It also setup initrd related data
 283  * if needed.
 284  */
 285 #ifdef CONFIG_SGI_IP27
 286
 287 static void __init bootmem_init(void)
 288 {
 289         init_initrd();
 290         finalize_initrd();
 291 }
 292
 293 #else  /* !CONFIG_SGI_IP27 */
 294
 295 static void __init bootmem_init(void)
 296 {
 297         unsigned long reserved_end;
 298         unsigned long mapstart = ~0UL;
 299         unsigned long bootmap_size;
 300         int i;
 301
 302         /*
 303          * Sanity check any INITRD first. We don't take it into account
 304          * for bootmem setup initially, rely on the end-of-kernel-code
 305          * as our memory range starting point. Once bootmem is inited we
 306          * will reserve the area used for the initrd.
 307          */
 308         init_initrd();
 309         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 310
 311         /*
 312          * max_low_pfn is not a number of pages. The number of pages
 313          * of the system is given by 'max_low_pfn - min_low_pfn'.
 314          */
 315         min_low_pfn = ~0UL;
 316         max_low_pfn = 0;
 317
 318         /*
 319          * Find the highest page frame number we have available.
 320          */
 321         for (i = 0; i < boot_mem_map.nr_map; i++) {
 322                 unsigned long start, end;
 323
 324                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 325                         continue;
 326
 327                 start = PFN_UP(boot_mem_map.map[i].addr);
 328                 end = PFN_DOWN(boot_mem_map.map[i].addr
 329                                 + boot_mem_map.map[i].size);
 330
 331                 if (end > max_low_pfn)
 332                         max_low_pfn = end;
 333                 if (start < min_low_pfn)
 334                         min_low_pfn = start;
 335                 if (end <= reserved_end)
 336                         continue;
 337                 if (start >= mapstart)
 338                         continue;
 339                 mapstart = max(reserved_end, start);
 340         }
 341
 342         if (min_low_pfn >= max_low_pfn)
 343                 panic("Incorrect memory mapping !!!");
 344         if (min_low_pfn > ARCH_PFN_OFFSET) {
 345                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 346                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 347                         min_low_pfn - ARCH_PFN_OFFSET);
 348         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 349                 pr_info("%lu free pages won't be used\n",
 350                         ARCH_PFN_OFFSET - min_low_pfn);
 351         }
 352         min_low_pfn = ARCH_PFN_OFFSET;
 353
 354         /*
 355          * Determine low and high memory ranges
 356          */
 357         max_pfn = max_low_pfn;
 358         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 359 #ifdef CONFIG_HIGHMEM
 360                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 361                 highend_pfn = max_low_pfn;
 362 #endif
 363                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 364         }
 365
 366 #ifdef CONFIG_BLK_DEV_INITRD
 367         /*
 368          * mapstart should be after initrd_end
 369          */
 370         if (initrd_end)
 371                 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
 372 #endif
 373
 374         /*
 375          * Initialize the boot-time allocator with low memory only.
 376          */
 377         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 378                                          min_low_pfn, max_low_pfn);
 379
 380
 381         for (i = 0; i < boot_mem_map.nr_map; i++) {
 382                 unsigned long start, end;
 383
 384                 start = PFN_UP(boot_mem_map.map[i].addr);
 385                 end = PFN_DOWN(boot_mem_map.map[i].addr
 386                                 + boot_mem_map.map[i].size);
 387
 388                 if (start <= min_low_pfn)
 389                         start = min_low_pfn;
 390                 if (start >= end)
 391                         continue;
 392
 393 #ifndef CONFIG_HIGHMEM
 394                 if (end > max_low_pfn)
 395                         end = max_low_pfn;
 396
 397                 /*
 398                  * ... finally, is the area going away?
 399                  */
 400                 if (end <= start)
 401                         continue;
 402 #endif
 403
 404                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 405         }
 406
 407         /*
 408          * Register fully available low RAM pages with the bootmem allocator.
 409          */
 410         for (i = 0; i < boot_mem_map.nr_map; i++) {
 411                 unsigned long start, end, size;
 412
 413                 start = PFN_UP(boot_mem_map.map[i].addr);
 414                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 415                                     + boot_mem_map.map[i].size);
 416
 417                 /*
 418                  * Reserve usable memory.
 419                  */
 420                 switch (boot_mem_map.map[i].type) {
 421                 case BOOT_MEM_RAM:
 422                         break;
 423                 case BOOT_MEM_INIT_RAM:
 424                         memory_present(0, start, end);
 425                         continue;
 426                 default:
 427                         /* Not usable memory */
 428                         continue;
 429                 }
 430
 431                 /*
 432                  * We are rounding up the start address of usable memory
 433                  * and at the end of the usable range downwards.
 434                  */
 435                 if (start >= max_low_pfn)
 436                         continue;
 437                 if (start < reserved_end)
 438                         start = reserved_end;
 439                 if (end > max_low_pfn)
 440                         end = max_low_pfn;
 441
 442                 /*
 443                  * ... finally, is the area going away?
 444                  */
 445                 if (end <= start)
 446                         continue;
 447                 size = end - start;
 448
 449                 /* Register lowmem ranges */
 450                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 451                 memory_present(0, start, end);
 452         }
 453
 454         /*
 455          * Reserve the bootmap memory.
 456          */
 457         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 458
 459         /*
 460          * Reserve initrd memory if needed.
 461          */
 462         finalize_initrd();
 463 }
 464
 465 #endif  /* CONFIG_SGI_IP27 */
 466
 467 /*
 468  * arch_mem_init - initialize memory management subsystem
 469  *
 470  *  o plat_mem_setup() detects the memory configuration and will record detected
 471  *    memory areas using add_memory_region.
 472  *
 473  * At this stage the memory configuration of the system is known to the
 474  * kernel but generic memory management system is still entirely uninitialized.
 475  *
 476  *  o bootmem_init()
 477  *  o sparse_init()
 478  *  o paging_init()
 479  *
 480  * At this stage the bootmem allocator is ready to use.
 481  *
 482  * NOTE: historically plat_mem_setup did the entire platform initialization.
 483  *       This was rather impractical because it meant plat_mem_setup had to
 484  * get away without any kind of memory allocator.  To keep old code from
 485  * breaking plat_setup was just renamed to plat_setup and a second platform
 486  * initialization hook for anything else was introduced.
 487  */
 488
 489 static int usermem __initdata;
 490
 491 static int __init early_parse_mem(char *p)
 492 {
 493         unsigned long start, size;
 494
 495         /*
 496          * If a user specifies memory size, we
 497          * blow away any automatically generated
 498          * size.
 499          */
 500         if (usermem == 0) {
 501                 boot_mem_map.nr_map = 0;
 502                 usermem = 1;
 503         }
 504         start = 0;
 505         size = memparse(p, &p);
 506         if (*p == '@')
 507                 start = memparse(p + 1, &p);
 508
 509         add_memory_region(start, size, BOOT_MEM_RAM);
 510         return 0;
 511 }
 512 early_param("mem", early_parse_mem);
 513
 514 #ifdef CONFIG_PROC_VMCORE
 515 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 516 static int __init early_parse_elfcorehdr(char *p)
 517 {
 518         int i;
 519
 520         setup_elfcorehdr = memparse(p, &p);
 521
 522         for (i = 0; i < boot_mem_map.nr_map; i++) {
 523                 unsigned long start = boot_mem_map.map[i].addr;
 524                 unsigned long end = (boot_mem_map.map[i].addr +
 525                                      boot_mem_map.map[i].size);
 526                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 527                         /*
 528                          * Reserve from the elf core header to the end of
 529                          * the memory segment, that should all be kdump
 530                          * reserved memory.
 531                          */
 532                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 533                         break;
 534                 }
 535         }
 536         /*
 537          * If we don't find it in the memory map, then we shouldn't
 538          * have to worry about it, as the new kernel won't use it.
 539          */
 540         return 0;
 541 }
 542 early_param("elfcorehdr", early_parse_elfcorehdr);
 543 #endif
 544
 545 static void __init arch_mem_addpart(phys_t mem, phys_t end, int type)
 546 {
 547         phys_t size;
 548         int i;
 549
 550         size = end - mem;
 551         if (!size)
 552                 return;
 553
 554         /* Make sure it is in the boot_mem_map */
 555         for (i = 0; i < boot_mem_map.nr_map; i++) {
 556                 if (mem >= boot_mem_map.map[i].addr &&
 557                     mem < (boot_mem_map.map[i].addr +
 558                            boot_mem_map.map[i].size))
 559                         return;
 560         }
 561         add_memory_region(mem, size, type);
 562 }
 563
 564 #ifdef CONFIG_KEXEC
 565 static inline unsigned long long get_total_mem(void)
 566 {
 567         unsigned long long total;
 568
 569         total = max_pfn - min_low_pfn;
 570         return total << PAGE_SHIFT;
 571 }
 572
 573 static void __init mips_parse_crashkernel(void)
 574 {
 575         unsigned long long total_mem;
 576         unsigned long long crash_size, crash_base;
 577         int ret;
 578
 579         total_mem = get_total_mem();
 580         ret = parse_crashkernel(boot_command_line, total_mem,
 581                                 &crash_size, &crash_base);
 582         if (ret != 0 || crash_size <= 0)
 583                 return;
 584
 585         crashk_res.start = crash_base;
 586         crashk_res.end   = crash_base + crash_size - 1;
 587 }
 588
 589 static void __init request_crashkernel(struct resource *res)
 590 {
 591         int ret;
 592
 593         ret = request_resource(res, &crashk_res);
 594         if (!ret)
 595                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 596                         (unsigned long)((crashk_res.end -
 597                                          crashk_res.start + 1) >> 20),
 598                         (unsigned long)(crashk_res.start  >> 20));
 599 }
 600 #else /* !defined(CONFIG_KEXEC)         */
 601 static void __init mips_parse_crashkernel(void)
 602 {
 603 }
 604
 605 static void __init request_crashkernel(struct resource *res)
 606 {
 607 }
 608 #endif /* !defined(CONFIG_KEXEC)  */
 609
 610 static void __init arch_mem_init(char **cmdline_p)
 611 {
 612         extern void plat_mem_setup(void);
 613
 614         /* call board setup routine */
 615         plat_mem_setup();
 616
 617         /*
 618          * Make sure all kernel memory is in the maps.  The "UP" and
 619          * "DOWN" are opposite for initdata since if it crosses over
 620          * into another memory section you don't want that to be
 621          * freed when the initdata is freed.
 622          */
 623         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
 624                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
 625                          BOOT_MEM_RAM);
 626         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
 627                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
 628                          BOOT_MEM_INIT_RAM);
 629
 630         pr_info("Determined physical RAM map:\n");
 631         print_memory_map();
 632
 633 #ifdef CONFIG_CMDLINE_BOOL
 634 #ifdef CONFIG_CMDLINE_OVERRIDE
 635         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 636 #else
 637         if (builtin_cmdline[0]) {
 638                 strlcat(arcs_cmdline, " ", COMMAND_LINE_SIZE);
 639                 strlcat(arcs_cmdline, builtin_cmdline, COMMAND_LINE_SIZE);
 640         }
 641         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 642 #endif
 643 #else
 644         strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 645 #endif
 646         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 647
 648         *cmdline_p = command_line;
 649
 650         parse_early_param();
 651
 652         if (usermem) {
 653                 pr_info("User-defined physical RAM map:\n");
 654                 print_memory_map();
 655         }
 656
 657         bootmem_init();
 658 #ifdef CONFIG_PROC_VMCORE
 659         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 660                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 661                        setup_elfcorehdr, setup_elfcorehdr_size);
 662                 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
 663                                 BOOTMEM_DEFAULT);
 664         }
 665 #endif
 666
 667         mips_parse_crashkernel();
 668 #ifdef CONFIG_KEXEC
 669         if (crashk_res.start != crashk_res.end)
 670                 reserve_bootmem(crashk_res.start,
 671                                 crashk_res.end - crashk_res.start + 1,
 672                                 BOOTMEM_DEFAULT);
 673 #endif
 674         device_tree_init();
 675         sparse_init();
 676         plat_swiotlb_setup();
 677         paging_init();
 678 }
 679
 680 static void __init resource_init(void)
 681 {
 682         int i;
 683
 684         if (UNCAC_BASE != IO_BASE)
 685                 return;
 686
 687         code_resource.start = __pa_symbol(&_text);
 688         code_resource.end = __pa_symbol(&_etext) - 1;
 689         data_resource.start = __pa_symbol(&_etext);
 690         data_resource.end = __pa_symbol(&_edata) - 1;
 691
 692         for (i = 0; i < boot_mem_map.nr_map; i++) {
 693                 struct resource *res;
 694                 unsigned long start, end;
 695
 696                 start = boot_mem_map.map[i].addr;
 697                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 698                 if (start >= HIGHMEM_START)
 699                         continue;
 700                 if (end >= HIGHMEM_START)
 701                         end = HIGHMEM_START - 1;
 702
 703                 res = alloc_bootmem(sizeof(struct resource));
 704                 switch (boot_mem_map.map[i].type) {
 705                 case BOOT_MEM_RAM:
 706                 case BOOT_MEM_INIT_RAM:
 707                 case BOOT_MEM_ROM_DATA:
 708                         res->name = "System RAM";
 709                         break;
 710                 case BOOT_MEM_RESERVED:
 711                 default:
 712                         res->name = "reserved";
 713                 }
 714
 715                 res->start = start;
 716                 res->end = end;
 717
 718                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 719                 request_resource(&iomem_resource, res);
 720
 721                 /*
 722                  *  We don't know which RAM region contains kernel data,
 723                  *  so we try it repeatedly and let the resource manager
 724                  *  test it.
 725                  */
 726                 request_resource(res, &code_resource);
 727                 request_resource(res, &data_resource);
 728                 request_crashkernel(res);
 729         }
 730 }
 731
 732 void __init setup_arch(char **cmdline_p)
 733 {
 734         cpu_probe();
 735         prom_init();
 736
 737 #ifdef CONFIG_EARLY_PRINTK
 738         setup_early_printk();
 739 #endif
 740         cpu_report();
 741         check_bugs_early();
 742
 743 #if defined(CONFIG_VT)
 744 #if defined(CONFIG_VGA_CONSOLE)
 745         conswitchp = &vga_con;
 746 #elif defined(CONFIG_DUMMY_CONSOLE)
 747         conswitchp = &dummy_con;
 748 #endif
 749 #endif
 750
 751         arch_mem_init(cmdline_p);
 752
 753         resource_init();
 754         plat_smp_setup();
 755
 756         cpu_cache_init();
 757 }
 758
 759 unsigned long kernelsp[NR_CPUS];
 760 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 761
 762 #ifdef CONFIG_DEBUG_FS
 763 struct dentry *mips_debugfs_dir;
 764 static int __init debugfs_mips(void)
 765 {
 766         struct dentry *d;
 767
 768         d = debugfs_create_dir("mips", NULL);
 769         if (!d)
 770                 return -ENOMEM;
 771         mips_debugfs_dir = d;
 772         return 0;
 773 }
 774 arch_initcall(debugfs_mips);
 775 #endif