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 #include <linux/device.h>
  28 #include <linux/dma-contiguous.h>
  29
  30 #include <asm/addrspace.h>
  31 #include <asm/bootinfo.h>
  32 #include <asm/bugs.h>
  33 #include <asm/cache.h>
  34 #include <asm/cdmm.h>
  35 #include <asm/cpu.h>
  36 #include <asm/debug.h>
  37 #include <asm/sections.h>
  38 #include <asm/setup.h>
  39 #include <asm/smp-ops.h>
  40 #include <asm/prom.h>
  41
  42 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  43 const char __section(.appended_dtb) __appended_dtb[0x100000];
  44 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  45
  46 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  47
  48 EXPORT_SYMBOL(cpu_data);
  49
  50 #ifdef CONFIG_VT
  51 struct screen_info screen_info;
  52 #endif
  53
  54 /*
  55  * Despite it's name this variable is even if we don't have PCI
  56  */
  57 unsigned int PCI_DMA_BUS_IS_PHYS;
  58
  59 EXPORT_SYMBOL(PCI_DMA_BUS_IS_PHYS);
  60
  61 /*
  62  * Setup information
  63  *
  64  * These are initialized so they are in the .data section
  65  */
  66 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  67
  68 EXPORT_SYMBOL(mips_machtype);
  69
  70 struct boot_mem_map boot_mem_map;
  71
  72 static char __initdata command_line[COMMAND_LINE_SIZE];
  73 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  74
  75 #ifdef CONFIG_CMDLINE_BOOL
  76 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  77 #endif
  78
  79 /*
  80  * mips_io_port_base is the begin of the address space to which x86 style
  81  * I/O ports are mapped.
  82  */
  83 const unsigned long mips_io_port_base = -1;
  84 EXPORT_SYMBOL(mips_io_port_base);
  85
  86 static struct resource code_resource = { .name = "Kernel code", };
  87 static struct resource data_resource = { .name = "Kernel data", };
  88
  89 static void *detect_magic __initdata = detect_memory_region;
  90
  91 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
  92 {
  93         int x = boot_mem_map.nr_map;
  94         int i;
  95
  96         /* Sanity check */
  97         if (start + size < start) {
  98                 pr_warn("Trying to add an invalid memory region, skipped\n");
  99                 return;
 100         }
 101
 102         /*
 103          * Try to merge with existing entry, if any.
 104          */
 105         for (i = 0; i < boot_mem_map.nr_map; i++) {
 106                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
 107                 unsigned long top;
 108
 109                 if (entry->type != type)
 110                         continue;
 111
 112                 if (start + size < entry->addr)
 113                         continue;                       /* no overlap */
 114
 115                 if (entry->addr + entry->size < start)
 116                         continue;                       /* no overlap */
 117
 118                 top = max(entry->addr + entry->size, start + size);
 119                 entry->addr = min(entry->addr, start);
 120                 entry->size = top - entry->addr;
 121
 122                 return;
 123         }
 124
 125         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 126                 pr_err("Ooops! Too many entries in the memory map!\n");
 127                 return;
 128         }
 129
 130         boot_mem_map.map[x].addr = start;
 131         boot_mem_map.map[x].size = size;
 132         boot_mem_map.map[x].type = type;
 133         boot_mem_map.nr_map++;
 134 }
 135
 136 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
 137 {
 138         void *dm = &detect_magic;
 139         phys_addr_t size;
 140
 141         for (size = sz_min; size < sz_max; size <<= 1) {
 142                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 143                         break;
 144         }
 145
 146         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 147                 ((unsigned long long) size) / SZ_1M,
 148                 (unsigned long long) start,
 149                 ((unsigned long long) sz_min) / SZ_1M,
 150                 ((unsigned long long) sz_max) / SZ_1M);
 151
 152         add_memory_region(start, size, BOOT_MEM_RAM);
 153 }
 154
 155 static void __init print_memory_map(void)
 156 {
 157         int i;
 158         const int field = 2 * sizeof(unsigned long);
 159
 160         for (i = 0; i < boot_mem_map.nr_map; i++) {
 161                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 162                        field, (unsigned long long) boot_mem_map.map[i].size,
 163                        field, (unsigned long long) boot_mem_map.map[i].addr);
 164
 165                 switch (boot_mem_map.map[i].type) {
 166                 case BOOT_MEM_RAM:
 167                         printk(KERN_CONT "(usable)\n");
 168                         break;
 169                 case BOOT_MEM_INIT_RAM:
 170                         printk(KERN_CONT "(usable after init)\n");
 171                         break;
 172                 case BOOT_MEM_ROM_DATA:
 173                         printk(KERN_CONT "(ROM data)\n");
 174                         break;
 175                 case BOOT_MEM_RESERVED:
 176                         printk(KERN_CONT "(reserved)\n");
 177                         break;
 178                 default:
 179                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 180                         break;
 181                 }
 182         }
 183 }
 184
 185 /*
 186  * Manage initrd
 187  */
 188 #ifdef CONFIG_BLK_DEV_INITRD
 189
 190 static int __init rd_start_early(char *p)
 191 {
 192         unsigned long start = memparse(p, &p);
 193
 194 #ifdef CONFIG_64BIT
 195         /* Guess if the sign extension was forgotten by bootloader */
 196         if (start < XKPHYS)
 197                 start = (int)start;
 198 #endif
 199         initrd_start = start;
 200         initrd_end += start;
 201         return 0;
 202 }
 203 early_param("rd_start", rd_start_early);
 204
 205 static int __init rd_size_early(char *p)
 206 {
 207         initrd_end += memparse(p, &p);
 208         return 0;
 209 }
 210 early_param("rd_size", rd_size_early);
 211
 212 /* it returns the next free pfn after initrd */
 213 static unsigned long __init init_initrd(void)
 214 {
 215         unsigned long end;
 216
 217         /*
 218          * Board specific code or command line parser should have
 219          * already set up initrd_start and initrd_end. In these cases
 220          * perfom sanity checks and use them if all looks good.
 221          */
 222         if (!initrd_start || initrd_end <= initrd_start)
 223                 goto disable;
 224
 225         if (initrd_start & ~PAGE_MASK) {
 226                 pr_err("initrd start must be page aligned\n");
 227                 goto disable;
 228         }
 229         if (initrd_start < PAGE_OFFSET) {
 230                 pr_err("initrd start < PAGE_OFFSET\n");
 231                 goto disable;
 232         }
 233
 234         /*
 235          * Sanitize initrd addresses. For example firmware
 236          * can't guess if they need to pass them through
 237          * 64-bits values if the kernel has been built in pure
 238          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 239          * addresses now, so the code can now safely use __pa().
 240          */
 241         end = __pa(initrd_end);
 242         initrd_end = (unsigned long)__va(end);
 243         initrd_start = (unsigned long)__va(__pa(initrd_start));
 244
 245         ROOT_DEV = Root_RAM0;
 246         return PFN_UP(end);
 247 disable:
 248         initrd_start = 0;
 249         initrd_end = 0;
 250         return 0;
 251 }
 252
 253 static void __init finalize_initrd(void)
 254 {
 255         unsigned long size = initrd_end - initrd_start;
 256
 257         if (size == 0) {
 258                 printk(KERN_INFO "Initrd not found or empty");
 259                 goto disable;
 260         }
 261         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 262                 printk(KERN_ERR "Initrd extends beyond end of memory");
 263                 goto disable;
 264         }
 265
 266         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 267         initrd_below_start_ok = 1;
 268
 269         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 270                 initrd_start, size);
 271         return;
 272 disable:
 273         printk(KERN_CONT " - disabling initrd\n");
 274         initrd_start = 0;
 275         initrd_end = 0;
 276 }
 277
 278 #else  /* !CONFIG_BLK_DEV_INITRD */
 279
 280 static unsigned long __init init_initrd(void)
 281 {
 282         return 0;
 283 }
 284
 285 #define finalize_initrd()       do {} while (0)
 286
 287 #endif
 288
 289 /*
 290  * Initialize the bootmem allocator. It also setup initrd related data
 291  * if needed.
 292  */
 293 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
 294
 295 static void __init bootmem_init(void)
 296 {
 297         init_initrd();
 298         finalize_initrd();
 299 }
 300
 301 #else  /* !CONFIG_SGI_IP27 */
 302
 303 static void __init bootmem_init(void)
 304 {
 305         unsigned long reserved_end;
 306         unsigned long mapstart = ~0UL;
 307         unsigned long bootmap_size;
 308         int i;
 309
 310         /*
 311          * Sanity check any INITRD first. We don't take it into account
 312          * for bootmem setup initially, rely on the end-of-kernel-code
 313          * as our memory range starting point. Once bootmem is inited we
 314          * will reserve the area used for the initrd.
 315          */
 316         init_initrd();
 317         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 318
 319         /*
 320          * max_low_pfn is not a number of pages. The number of pages
 321          * of the system is given by 'max_low_pfn - min_low_pfn'.
 322          */
 323         min_low_pfn = ~0UL;
 324         max_low_pfn = 0;
 325
 326         /*
 327          * Find the highest page frame number we have available.
 328          */
 329         for (i = 0; i < boot_mem_map.nr_map; i++) {
 330                 unsigned long start, end;
 331
 332                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 333                         continue;
 334
 335                 start = PFN_UP(boot_mem_map.map[i].addr);
 336                 end = PFN_DOWN(boot_mem_map.map[i].addr
 337                                 + boot_mem_map.map[i].size);
 338
 339                 if (end > max_low_pfn)
 340                         max_low_pfn = end;
 341                 if (start < min_low_pfn)
 342                         min_low_pfn = start;
 343                 if (end <= reserved_end)
 344                         continue;
 345 #ifdef CONFIG_BLK_DEV_INITRD
 346                 /* Skip zones before initrd and initrd itself */
 347                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
 348                         continue;
 349 #endif
 350                 if (start >= mapstart)
 351                         continue;
 352                 mapstart = max(reserved_end, start);
 353         }
 354
 355         if (min_low_pfn >= max_low_pfn)
 356                 panic("Incorrect memory mapping !!!");
 357         if (min_low_pfn > ARCH_PFN_OFFSET) {
 358                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 359                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 360                         min_low_pfn - ARCH_PFN_OFFSET);
 361         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 362                 pr_info("%lu free pages won't be used\n",
 363                         ARCH_PFN_OFFSET - min_low_pfn);
 364         }
 365         min_low_pfn = ARCH_PFN_OFFSET;
 366
 367         /*
 368          * Determine low and high memory ranges
 369          */
 370         max_pfn = max_low_pfn;
 371         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 372 #ifdef CONFIG_HIGHMEM
 373                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 374                 highend_pfn = max_low_pfn;
 375 #endif
 376                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 377         }
 378
 379 #ifdef CONFIG_BLK_DEV_INITRD
 380         /*
 381          * mapstart should be after initrd_end
 382          */
 383         if (initrd_end)
 384                 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
 385 #endif
 386
 387         /*
 388          * Initialize the boot-time allocator with low memory only.
 389          */
 390         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 391                                          min_low_pfn, max_low_pfn);
 392
 393
 394         for (i = 0; i < boot_mem_map.nr_map; i++) {
 395                 unsigned long start, end;
 396
 397                 start = PFN_UP(boot_mem_map.map[i].addr);
 398                 end = PFN_DOWN(boot_mem_map.map[i].addr
 399                                 + boot_mem_map.map[i].size);
 400
 401                 if (start <= min_low_pfn)
 402                         start = min_low_pfn;
 403                 if (start >= end)
 404                         continue;
 405
 406 #ifndef CONFIG_HIGHMEM
 407                 if (end > max_low_pfn)
 408                         end = max_low_pfn;
 409
 410                 /*
 411                  * ... finally, is the area going away?
 412                  */
 413                 if (end <= start)
 414                         continue;
 415 #endif
 416
 417                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 418         }
 419
 420         /*
 421          * Register fully available low RAM pages with the bootmem allocator.
 422          */
 423         for (i = 0; i < boot_mem_map.nr_map; i++) {
 424                 unsigned long start, end, size;
 425
 426                 start = PFN_UP(boot_mem_map.map[i].addr);
 427                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 428                                     + boot_mem_map.map[i].size);
 429
 430                 /*
 431                  * Reserve usable memory.
 432                  */
 433                 switch (boot_mem_map.map[i].type) {
 434                 case BOOT_MEM_RAM:
 435                         break;
 436                 case BOOT_MEM_INIT_RAM:
 437                         memory_present(0, start, end);
 438                         continue;
 439                 default:
 440                         /* Not usable memory */
 441                         continue;
 442                 }
 443
 444                 /*
 445                  * We are rounding up the start address of usable memory
 446                  * and at the end of the usable range downwards.
 447                  */
 448                 if (start >= max_low_pfn)
 449                         continue;
 450                 if (start < reserved_end)
 451                         start = reserved_end;
 452                 if (end > max_low_pfn)
 453                         end = max_low_pfn;
 454
 455                 /*
 456                  * ... finally, is the area going away?
 457                  */
 458                 if (end <= start)
 459                         continue;
 460                 size = end - start;
 461
 462                 /* Register lowmem ranges */
 463                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 464                 memory_present(0, start, end);
 465         }
 466
 467         /*
 468          * Reserve the bootmap memory.
 469          */
 470         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 471
 472         /*
 473          * Reserve initrd memory if needed.
 474          */
 475         finalize_initrd();
 476 }
 477
 478 #endif  /* CONFIG_SGI_IP27 */
 479
 480 /*
 481  * arch_mem_init - initialize memory management subsystem
 482  *
 483  *  o plat_mem_setup() detects the memory configuration and will record detected
 484  *    memory areas using add_memory_region.
 485  *
 486  * At this stage the memory configuration of the system is known to the
 487  * kernel but generic memory management system is still entirely uninitialized.
 488  *
 489  *  o bootmem_init()
 490  *  o sparse_init()
 491  *  o paging_init()
 492  *  o dma_contiguous_reserve()
 493  *
 494  * At this stage the bootmem allocator is ready to use.
 495  *
 496  * NOTE: historically plat_mem_setup did the entire platform initialization.
 497  *       This was rather impractical because it meant plat_mem_setup had to
 498  * get away without any kind of memory allocator.  To keep old code from
 499  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 500  * initialization hook for anything else was introduced.
 501  */
 502
 503 static int usermem __initdata;
 504
 505 static int __init early_parse_mem(char *p)
 506 {
 507         phys_addr_t start, size;
 508
 509         /*
 510          * If a user specifies memory size, we
 511          * blow away any automatically generated
 512          * size.
 513          */
 514         if (usermem == 0) {
 515                 boot_mem_map.nr_map = 0;
 516                 usermem = 1;
 517         }
 518         start = 0;
 519         size = memparse(p, &p);
 520         if (*p == '@')
 521                 start = memparse(p + 1, &p);
 522
 523         add_memory_region(start, size, BOOT_MEM_RAM);
 524         return 0;
 525 }
 526 early_param("mem", early_parse_mem);
 527
 528 #ifdef CONFIG_PROC_VMCORE
 529 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 530 static int __init early_parse_elfcorehdr(char *p)
 531 {
 532         int i;
 533
 534         setup_elfcorehdr = memparse(p, &p);
 535
 536         for (i = 0; i < boot_mem_map.nr_map; i++) {
 537                 unsigned long start = boot_mem_map.map[i].addr;
 538                 unsigned long end = (boot_mem_map.map[i].addr +
 539                                      boot_mem_map.map[i].size);
 540                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 541                         /*
 542                          * Reserve from the elf core header to the end of
 543                          * the memory segment, that should all be kdump
 544                          * reserved memory.
 545                          */
 546                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 547                         break;
 548                 }
 549         }
 550         /*
 551          * If we don't find it in the memory map, then we shouldn't
 552          * have to worry about it, as the new kernel won't use it.
 553          */
 554         return 0;
 555 }
 556 early_param("elfcorehdr", early_parse_elfcorehdr);
 557 #endif
 558
 559 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
 560 {
 561         phys_addr_t size;
 562         int i;
 563
 564         size = end - mem;
 565         if (!size)
 566                 return;
 567
 568         /* Make sure it is in the boot_mem_map */
 569         for (i = 0; i < boot_mem_map.nr_map; i++) {
 570                 if (mem >= boot_mem_map.map[i].addr &&
 571                     mem < (boot_mem_map.map[i].addr +
 572                            boot_mem_map.map[i].size))
 573                         return;
 574         }
 575         add_memory_region(mem, size, type);
 576 }
 577
 578 #ifdef CONFIG_KEXEC
 579 static inline unsigned long long get_total_mem(void)
 580 {
 581         unsigned long long total;
 582
 583         total = max_pfn - min_low_pfn;
 584         return total << PAGE_SHIFT;
 585 }
 586
 587 static void __init mips_parse_crashkernel(void)
 588 {
 589         unsigned long long total_mem;
 590         unsigned long long crash_size, crash_base;
 591         int ret;
 592
 593         total_mem = get_total_mem();
 594         ret = parse_crashkernel(boot_command_line, total_mem,
 595                                 &crash_size, &crash_base);
 596         if (ret != 0 || crash_size <= 0)
 597                 return;
 598
 599         crashk_res.start = crash_base;
 600         crashk_res.end   = crash_base + crash_size - 1;
 601 }
 602
 603 static void __init request_crashkernel(struct resource *res)
 604 {
 605         int ret;
 606
 607         ret = request_resource(res, &crashk_res);
 608         if (!ret)
 609                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 610                         (unsigned long)((crashk_res.end -
 611                                          crashk_res.start + 1) >> 20),
 612                         (unsigned long)(crashk_res.start  >> 20));
 613 }
 614 #else /* !defined(CONFIG_KEXEC)         */
 615 static void __init mips_parse_crashkernel(void)
 616 {
 617 }
 618
 619 static void __init request_crashkernel(struct resource *res)
 620 {
 621 }
 622 #endif /* !defined(CONFIG_KEXEC)  */
 623
 624 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
 625 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
 626 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
 627
 628 static void __init arch_mem_init(char **cmdline_p)
 629 {
 630         struct memblock_region *reg;
 631         extern void plat_mem_setup(void);
 632
 633         /* call board setup routine */
 634         plat_mem_setup();
 635
 636         /*
 637          * Make sure all kernel memory is in the maps.  The "UP" and
 638          * "DOWN" are opposite for initdata since if it crosses over
 639          * into another memory section you don't want that to be
 640          * freed when the initdata is freed.
 641          */
 642         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
 643                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
 644                          BOOT_MEM_RAM);
 645         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
 646                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
 647                          BOOT_MEM_INIT_RAM);
 648
 649         pr_info("Determined physical RAM map:\n");
 650         print_memory_map();
 651
 652 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
 653         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 654 #else
 655         if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
 656             (USE_DTB_CMDLINE && !boot_command_line[0]))
 657                 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 658
 659         if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
 660                 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 661                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 662         }
 663
 664 #if defined(CONFIG_CMDLINE_BOOL)
 665         if (builtin_cmdline[0]) {
 666                 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 667                 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 668         }
 669 #endif
 670 #endif
 671         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 672
 673         *cmdline_p = command_line;
 674
 675         parse_early_param();
 676
 677         if (usermem) {
 678                 pr_info("User-defined physical RAM map:\n");
 679                 print_memory_map();
 680         }
 681
 682         bootmem_init();
 683 #ifdef CONFIG_PROC_VMCORE
 684         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 685                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 686                        setup_elfcorehdr, setup_elfcorehdr_size);
 687                 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
 688                                 BOOTMEM_DEFAULT);
 689         }
 690 #endif
 691
 692         mips_parse_crashkernel();
 693 #ifdef CONFIG_KEXEC
 694         if (crashk_res.start != crashk_res.end)
 695                 reserve_bootmem(crashk_res.start,
 696                                 crashk_res.end - crashk_res.start + 1,
 697                                 BOOTMEM_DEFAULT);
 698 #endif
 699         device_tree_init();
 700         sparse_init();
 701         plat_swiotlb_setup();
 702         paging_init();
 703
 704         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 705         /* Tell bootmem about cma reserved memblock section */
 706         for_each_memblock(reserved, reg)
 707                 if (reg->size != 0)
 708                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 709 }
 710
 711 static void __init resource_init(void)
 712 {
 713         int i;
 714
 715         if (UNCAC_BASE != IO_BASE)
 716                 return;
 717
 718         code_resource.start = __pa_symbol(&_text);
 719         code_resource.end = __pa_symbol(&_etext) - 1;
 720         data_resource.start = __pa_symbol(&_etext);
 721         data_resource.end = __pa_symbol(&_edata) - 1;
 722
 723         for (i = 0; i < boot_mem_map.nr_map; i++) {
 724                 struct resource *res;
 725                 unsigned long start, end;
 726
 727                 start = boot_mem_map.map[i].addr;
 728                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 729                 if (start >= HIGHMEM_START)
 730                         continue;
 731                 if (end >= HIGHMEM_START)
 732                         end = HIGHMEM_START - 1;
 733
 734                 res = alloc_bootmem(sizeof(struct resource));
 735
 736                 res->start = start;
 737                 res->end = end;
 738                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 739
 740                 switch (boot_mem_map.map[i].type) {
 741                 case BOOT_MEM_RAM:
 742                 case BOOT_MEM_INIT_RAM:
 743                 case BOOT_MEM_ROM_DATA:
 744                         res->name = "System RAM";
 745                         res->flags |= IORESOURCE_SYSRAM;
 746                         break;
 747                 case BOOT_MEM_RESERVED:
 748                 default:
 749                         res->name = "reserved";
 750                 }
 751
 752                 request_resource(&iomem_resource, res);
 753
 754                 /*
 755                  *  We don't know which RAM region contains kernel data,
 756                  *  so we try it repeatedly and let the resource manager
 757                  *  test it.
 758                  */
 759                 request_resource(res, &code_resource);
 760                 request_resource(res, &data_resource);
 761                 request_crashkernel(res);
 762         }
 763 }
 764
 765 #ifdef CONFIG_SMP
 766 static void __init prefill_possible_map(void)
 767 {
 768         int i, possible = num_possible_cpus();
 769
 770         if (possible > nr_cpu_ids)
 771                 possible = nr_cpu_ids;
 772
 773         for (i = 0; i < possible; i++)
 774                 set_cpu_possible(i, true);
 775         for (; i < NR_CPUS; i++)
 776                 set_cpu_possible(i, false);
 777
 778         nr_cpu_ids = possible;
 779 }
 780 #else
 781 static inline void prefill_possible_map(void) {}
 782 #endif
 783
 784 void __init setup_arch(char **cmdline_p)
 785 {
 786         cpu_probe();
 787         mips_cm_probe();
 788         prom_init();
 789
 790         setup_early_fdc_console();
 791 #ifdef CONFIG_EARLY_PRINTK
 792         setup_early_printk();
 793 #endif
 794         cpu_report();
 795         check_bugs_early();
 796
 797 #if defined(CONFIG_VT)
 798 #if defined(CONFIG_VGA_CONSOLE)
 799         conswitchp = &vga_con;
 800 #elif defined(CONFIG_DUMMY_CONSOLE)
 801         conswitchp = &dummy_con;
 802 #endif
 803 #endif
 804
 805         arch_mem_init(cmdline_p);
 806
 807         resource_init();
 808         plat_smp_setup();
 809         prefill_possible_map();
 810
 811         cpu_cache_init();
 812 }
 813
 814 unsigned long kernelsp[NR_CPUS];
 815 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 816
 817 #ifdef CONFIG_DEBUG_FS
 818 struct dentry *mips_debugfs_dir;
 819 static int __init debugfs_mips(void)
 820 {
 821         struct dentry *d;
 822
 823         d = debugfs_create_dir("mips", NULL);
 824         if (!d)
 825                 return -ENOMEM;
 826         mips_debugfs_dir = d;
 827         return 0;
 828 }
 829 arch_initcall(debugfs_mips);
 830 #endif