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 #include <linux/decompress/generic.h>
  30 #include <linux/of_fdt.h>
  31
  32 #include <asm/addrspace.h>
  33 #include <asm/bootinfo.h>
  34 #include <asm/bugs.h>
  35 #include <asm/cache.h>
  36 #include <asm/cdmm.h>
  37 #include <asm/cpu.h>
  38 #include <asm/debug.h>
  39 #include <asm/sections.h>
  40 #include <asm/setup.h>
  41 #include <asm/smp-ops.h>
  42 #include <asm/prom.h>
  43
  44 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  45 const char __section(.appended_dtb) __appended_dtb[0x100000];
  46 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  47
  48 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  49
  50 EXPORT_SYMBOL(cpu_data);
  51
  52 #ifdef CONFIG_VT
  53 struct screen_info screen_info;
  54 #endif
  55
  56 /*
  57  * Setup information
  58  *
  59  * These are initialized so they are in the .data section
  60  */
  61 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  62
  63 EXPORT_SYMBOL(mips_machtype);
  64
  65 struct boot_mem_map boot_mem_map;
  66
  67 static char __initdata command_line[COMMAND_LINE_SIZE];
  68 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  69
  70 #ifdef CONFIG_CMDLINE_BOOL
  71 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  72 #endif
  73
  74 /*
  75  * mips_io_port_base is the begin of the address space to which x86 style
  76  * I/O ports are mapped.
  77  */
  78 const unsigned long mips_io_port_base = -1;
  79 EXPORT_SYMBOL(mips_io_port_base);
  80
  81 static struct resource code_resource = { .name = "Kernel code", };
  82 static struct resource data_resource = { .name = "Kernel data", };
  83
  84 static void *detect_magic __initdata = detect_memory_region;
  85
  86 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
  87 {
  88         int x = boot_mem_map.nr_map;
  89         int i;
  90
  91         /*
  92          * If the region reaches the top of the physical address space, adjust
  93          * the size slightly so that (start + size) doesn't overflow
  94          */
  95         if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
  96                 --size;
  97
  98         /* Sanity check */
  99         if (start + size < start) {
 100                 pr_warn("Trying to add an invalid memory region, skipped\n");
 101                 return;
 102         }
 103
 104         /*
 105          * Try to merge with existing entry, if any.
 106          */
 107         for (i = 0; i < boot_mem_map.nr_map; i++) {
 108                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
 109                 unsigned long top;
 110
 111                 if (entry->type != type)
 112                         continue;
 113
 114                 if (start + size < entry->addr)
 115                         continue;                       /* no overlap */
 116
 117                 if (entry->addr + entry->size < start)
 118                         continue;                       /* no overlap */
 119
 120                 top = max(entry->addr + entry->size, start + size);
 121                 entry->addr = min(entry->addr, start);
 122                 entry->size = top - entry->addr;
 123
 124                 return;
 125         }
 126
 127         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 128                 pr_err("Ooops! Too many entries in the memory map!\n");
 129                 return;
 130         }
 131
 132         boot_mem_map.map[x].addr = start;
 133         boot_mem_map.map[x].size = size;
 134         boot_mem_map.map[x].type = type;
 135         boot_mem_map.nr_map++;
 136 }
 137
 138 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
 139 {
 140         void *dm = &detect_magic;
 141         phys_addr_t size;
 142
 143         for (size = sz_min; size < sz_max; size <<= 1) {
 144                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 145                         break;
 146         }
 147
 148         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 149                 ((unsigned long long) size) / SZ_1M,
 150                 (unsigned long long) start,
 151                 ((unsigned long long) sz_min) / SZ_1M,
 152                 ((unsigned long long) sz_max) / SZ_1M);
 153
 154         add_memory_region(start, size, BOOT_MEM_RAM);
 155 }
 156
 157 bool __init memory_region_available(phys_addr_t start, phys_addr_t size)
 158 {
 159         int i;
 160         bool in_ram = false, free = true;
 161
 162         for (i = 0; i < boot_mem_map.nr_map; i++) {
 163                 phys_addr_t start_, end_;
 164
 165                 start_ = boot_mem_map.map[i].addr;
 166                 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
 167
 168                 switch (boot_mem_map.map[i].type) {
 169                 case BOOT_MEM_RAM:
 170                         if (start >= start_ && start + size <= end_)
 171                                 in_ram = true;
 172                         break;
 173                 case BOOT_MEM_RESERVED:
 174                         if ((start >= start_ && start < end_) ||
 175                             (start < start_ && start + size >= start_))
 176                                 free = false;
 177                         break;
 178                 default:
 179                         continue;
 180                 }
 181         }
 182
 183         return in_ram && free;
 184 }
 185
 186 static void __init print_memory_map(void)
 187 {
 188         int i;
 189         const int field = 2 * sizeof(unsigned long);
 190
 191         for (i = 0; i < boot_mem_map.nr_map; i++) {
 192                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 193                        field, (unsigned long long) boot_mem_map.map[i].size,
 194                        field, (unsigned long long) boot_mem_map.map[i].addr);
 195
 196                 switch (boot_mem_map.map[i].type) {
 197                 case BOOT_MEM_RAM:
 198                         printk(KERN_CONT "(usable)\n");
 199                         break;
 200                 case BOOT_MEM_INIT_RAM:
 201                         printk(KERN_CONT "(usable after init)\n");
 202                         break;
 203                 case BOOT_MEM_ROM_DATA:
 204                         printk(KERN_CONT "(ROM data)\n");
 205                         break;
 206                 case BOOT_MEM_RESERVED:
 207                         printk(KERN_CONT "(reserved)\n");
 208                         break;
 209                 default:
 210                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 211                         break;
 212                 }
 213         }
 214 }
 215
 216 /*
 217  * Manage initrd
 218  */
 219 #ifdef CONFIG_BLK_DEV_INITRD
 220
 221 static int __init rd_start_early(char *p)
 222 {
 223         unsigned long start = memparse(p, &p);
 224
 225 #ifdef CONFIG_64BIT
 226         /* Guess if the sign extension was forgotten by bootloader */
 227         if (start < XKPHYS)
 228                 start = (int)start;
 229 #endif
 230         initrd_start = start;
 231         initrd_end += start;
 232         return 0;
 233 }
 234 early_param("rd_start", rd_start_early);
 235
 236 static int __init rd_size_early(char *p)
 237 {
 238         initrd_end += memparse(p, &p);
 239         return 0;
 240 }
 241 early_param("rd_size", rd_size_early);
 242
 243 /* it returns the next free pfn after initrd */
 244 static unsigned long __init init_initrd(void)
 245 {
 246         unsigned long end;
 247
 248         /*
 249          * Board specific code or command line parser should have
 250          * already set up initrd_start and initrd_end. In these cases
 251          * perfom sanity checks and use them if all looks good.
 252          */
 253         if (!initrd_start || initrd_end <= initrd_start)
 254                 goto disable;
 255
 256         if (initrd_start & ~PAGE_MASK) {
 257                 pr_err("initrd start must be page aligned\n");
 258                 goto disable;
 259         }
 260         if (initrd_start < PAGE_OFFSET) {
 261                 pr_err("initrd start < PAGE_OFFSET\n");
 262                 goto disable;
 263         }
 264
 265         /*
 266          * Sanitize initrd addresses. For example firmware
 267          * can't guess if they need to pass them through
 268          * 64-bits values if the kernel has been built in pure
 269          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 270          * addresses now, so the code can now safely use __pa().
 271          */
 272         end = __pa(initrd_end);
 273         initrd_end = (unsigned long)__va(end);
 274         initrd_start = (unsigned long)__va(__pa(initrd_start));
 275
 276         ROOT_DEV = Root_RAM0;
 277         return PFN_UP(end);
 278 disable:
 279         initrd_start = 0;
 280         initrd_end = 0;
 281         return 0;
 282 }
 283
 284 /* In some conditions (e.g. big endian bootloader with a little endian
 285    kernel), the initrd might appear byte swapped.  Try to detect this and
 286    byte swap it if needed.  */
 287 static void __init maybe_bswap_initrd(void)
 288 {
 289 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 290         u64 buf;
 291
 292         /* Check for CPIO signature */
 293         if (!memcmp((void *)initrd_start, "070701", 6))
 294                 return;
 295
 296         /* Check for compressed initrd */
 297         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 298                 return;
 299
 300         /* Try again with a byte swapped header */
 301         buf = swab64p((u64 *)initrd_start);
 302         if (!memcmp(&buf, "070701", 6) ||
 303             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 304                 unsigned long i;
 305
 306                 pr_info("Byteswapped initrd detected\n");
 307                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 308                         swab64s((u64 *)i);
 309         }
 310 #endif
 311 }
 312
 313 static void __init finalize_initrd(void)
 314 {
 315         unsigned long size = initrd_end - initrd_start;
 316
 317         if (size == 0) {
 318                 printk(KERN_INFO "Initrd not found or empty");
 319                 goto disable;
 320         }
 321         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 322                 printk(KERN_ERR "Initrd extends beyond end of memory");
 323                 goto disable;
 324         }
 325
 326         maybe_bswap_initrd();
 327
 328         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 329         initrd_below_start_ok = 1;
 330
 331         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 332                 initrd_start, size);
 333         return;
 334 disable:
 335         printk(KERN_CONT " - disabling initrd\n");
 336         initrd_start = 0;
 337         initrd_end = 0;
 338 }
 339
 340 #else  /* !CONFIG_BLK_DEV_INITRD */
 341
 342 static unsigned long __init init_initrd(void)
 343 {
 344         return 0;
 345 }
 346
 347 #define finalize_initrd()       do {} while (0)
 348
 349 #endif
 350
 351 /*
 352  * Initialize the bootmem allocator. It also setup initrd related data
 353  * if needed.
 354  */
 355 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
 356
 357 static void __init bootmem_init(void)
 358 {
 359         init_initrd();
 360         finalize_initrd();
 361 }
 362
 363 #else  /* !CONFIG_SGI_IP27 */
 364
 365 static unsigned long __init bootmap_bytes(unsigned long pages)
 366 {
 367         unsigned long bytes = DIV_ROUND_UP(pages, 8);
 368
 369         return ALIGN(bytes, sizeof(long));
 370 }
 371
 372 static void __init bootmem_init(void)
 373 {
 374         unsigned long reserved_end;
 375         unsigned long mapstart = ~0UL;
 376         unsigned long bootmap_size;
 377         bool bootmap_valid = false;
 378         int i;
 379
 380         /*
 381          * Sanity check any INITRD first. We don't take it into account
 382          * for bootmem setup initially, rely on the end-of-kernel-code
 383          * as our memory range starting point. Once bootmem is inited we
 384          * will reserve the area used for the initrd.
 385          */
 386         init_initrd();
 387         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 388
 389         /*
 390          * max_low_pfn is not a number of pages. The number of pages
 391          * of the system is given by 'max_low_pfn - min_low_pfn'.
 392          */
 393         min_low_pfn = ~0UL;
 394         max_low_pfn = 0;
 395
 396         /*
 397          * Find the highest page frame number we have available.
 398          */
 399         for (i = 0; i < boot_mem_map.nr_map; i++) {
 400                 unsigned long start, end;
 401
 402                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 403                         continue;
 404
 405                 start = PFN_UP(boot_mem_map.map[i].addr);
 406                 end = PFN_DOWN(boot_mem_map.map[i].addr
 407                                 + boot_mem_map.map[i].size);
 408
 409 #ifndef CONFIG_HIGHMEM
 410                 /*
 411                  * Skip highmem here so we get an accurate max_low_pfn if low
 412                  * memory stops short of high memory.
 413                  * If the region overlaps HIGHMEM_START, end is clipped so
 414                  * max_pfn excludes the highmem portion.
 415                  */
 416                 if (start >= PFN_DOWN(HIGHMEM_START))
 417                         continue;
 418                 if (end > PFN_DOWN(HIGHMEM_START))
 419                         end = PFN_DOWN(HIGHMEM_START);
 420 #endif
 421
 422                 if (end > max_low_pfn)
 423                         max_low_pfn = end;
 424                 if (start < min_low_pfn)
 425                         min_low_pfn = start;
 426                 if (end <= reserved_end)
 427                         continue;
 428 #ifdef CONFIG_BLK_DEV_INITRD
 429                 /* Skip zones before initrd and initrd itself */
 430                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
 431                         continue;
 432 #endif
 433                 if (start >= mapstart)
 434                         continue;
 435                 mapstart = max(reserved_end, start);
 436         }
 437
 438         if (min_low_pfn >= max_low_pfn)
 439                 panic("Incorrect memory mapping !!!");
 440         if (min_low_pfn > ARCH_PFN_OFFSET) {
 441                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 442                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 443                         min_low_pfn - ARCH_PFN_OFFSET);
 444         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 445                 pr_info("%lu free pages won't be used\n",
 446                         ARCH_PFN_OFFSET - min_low_pfn);
 447         }
 448         min_low_pfn = ARCH_PFN_OFFSET;
 449
 450         /*
 451          * Determine low and high memory ranges
 452          */
 453         max_pfn = max_low_pfn;
 454         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 455 #ifdef CONFIG_HIGHMEM
 456                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 457                 highend_pfn = max_low_pfn;
 458 #endif
 459                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 460         }
 461
 462 #ifdef CONFIG_BLK_DEV_INITRD
 463         /*
 464          * mapstart should be after initrd_end
 465          */
 466         if (initrd_end)
 467                 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
 468 #endif
 469
 470         /*
 471          * check that mapstart doesn't overlap with any of
 472          * memory regions that have been reserved through eg. DTB
 473          */
 474         bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
 475
 476         bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
 477                                                 bootmap_size);
 478         for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
 479                 unsigned long mapstart_addr;
 480
 481                 switch (boot_mem_map.map[i].type) {
 482                 case BOOT_MEM_RESERVED:
 483                         mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
 484                                                 boot_mem_map.map[i].size);
 485                         if (PHYS_PFN(mapstart_addr) < mapstart)
 486                                 break;
 487
 488                         bootmap_valid = memory_region_available(mapstart_addr,
 489                                                                 bootmap_size);
 490                         if (bootmap_valid)
 491                                 mapstart = PHYS_PFN(mapstart_addr);
 492                         break;
 493                 default:
 494                         break;
 495                 }
 496         }
 497
 498         if (!bootmap_valid)
 499                 panic("No memory area to place a bootmap bitmap");
 500
 501         /*
 502          * Initialize the boot-time allocator with low memory only.
 503          */
 504         if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
 505                                          min_low_pfn, max_low_pfn))
 506                 panic("Unexpected memory size required for bootmap");
 507
 508         for (i = 0; i < boot_mem_map.nr_map; i++) {
 509                 unsigned long start, end;
 510
 511                 start = PFN_UP(boot_mem_map.map[i].addr);
 512                 end = PFN_DOWN(boot_mem_map.map[i].addr
 513                                 + boot_mem_map.map[i].size);
 514
 515                 if (start <= min_low_pfn)
 516                         start = min_low_pfn;
 517                 if (start >= end)
 518                         continue;
 519
 520 #ifndef CONFIG_HIGHMEM
 521                 if (end > max_low_pfn)
 522                         end = max_low_pfn;
 523
 524                 /*
 525                  * ... finally, is the area going away?
 526                  */
 527                 if (end <= start)
 528                         continue;
 529 #endif
 530
 531                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 532         }
 533
 534         /*
 535          * Register fully available low RAM pages with the bootmem allocator.
 536          */
 537         for (i = 0; i < boot_mem_map.nr_map; i++) {
 538                 unsigned long start, end, size;
 539
 540                 start = PFN_UP(boot_mem_map.map[i].addr);
 541                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 542                                     + boot_mem_map.map[i].size);
 543
 544                 /*
 545                  * Reserve usable memory.
 546                  */
 547                 switch (boot_mem_map.map[i].type) {
 548                 case BOOT_MEM_RAM:
 549                         break;
 550                 case BOOT_MEM_INIT_RAM:
 551                         memory_present(0, start, end);
 552                         continue;
 553                 default:
 554                         /* Not usable memory */
 555                         if (start > min_low_pfn && end < max_low_pfn)
 556                                 reserve_bootmem(boot_mem_map.map[i].addr,
 557                                                 boot_mem_map.map[i].size,
 558                                                 BOOTMEM_DEFAULT);
 559                         continue;
 560                 }
 561
 562                 /*
 563                  * We are rounding up the start address of usable memory
 564                  * and at the end of the usable range downwards.
 565                  */
 566                 if (start >= max_low_pfn)
 567                         continue;
 568                 if (start < reserved_end)
 569                         start = reserved_end;
 570                 if (end > max_low_pfn)
 571                         end = max_low_pfn;
 572
 573                 /*
 574                  * ... finally, is the area going away?
 575                  */
 576                 if (end <= start)
 577                         continue;
 578                 size = end - start;
 579
 580                 /* Register lowmem ranges */
 581                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 582                 memory_present(0, start, end);
 583         }
 584
 585         /*
 586          * Reserve the bootmap memory.
 587          */
 588         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 589
 590 #ifdef CONFIG_RELOCATABLE
 591         /*
 592          * The kernel reserves all memory below its _end symbol as bootmem,
 593          * but the kernel may now be at a much higher address. The memory
 594          * between the original and new locations may be returned to the system.
 595          */
 596         if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
 597                 unsigned long offset;
 598                 extern void show_kernel_relocation(const char *level);
 599
 600                 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
 601                 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
 602
 603 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
 604                 /*
 605                  * This information is necessary when debugging the kernel
 606                  * But is a security vulnerability otherwise!
 607                  */
 608                 show_kernel_relocation(KERN_INFO);
 609 #endif
 610         }
 611 #endif
 612
 613         /*
 614          * Reserve initrd memory if needed.
 615          */
 616         finalize_initrd();
 617 }
 618
 619 #endif  /* CONFIG_SGI_IP27 */
 620
 621 /*
 622  * arch_mem_init - initialize memory management subsystem
 623  *
 624  *  o plat_mem_setup() detects the memory configuration and will record detected
 625  *    memory areas using add_memory_region.
 626  *
 627  * At this stage the memory configuration of the system is known to the
 628  * kernel but generic memory management system is still entirely uninitialized.
 629  *
 630  *  o bootmem_init()
 631  *  o sparse_init()
 632  *  o paging_init()
 633  *  o dma_contiguous_reserve()
 634  *
 635  * At this stage the bootmem allocator is ready to use.
 636  *
 637  * NOTE: historically plat_mem_setup did the entire platform initialization.
 638  *       This was rather impractical because it meant plat_mem_setup had to
 639  * get away without any kind of memory allocator.  To keep old code from
 640  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 641  * initialization hook for anything else was introduced.
 642  */
 643
 644 static int usermem __initdata;
 645
 646 static int __init early_parse_mem(char *p)
 647 {
 648         phys_addr_t start, size;
 649
 650         /*
 651          * If a user specifies memory size, we
 652          * blow away any automatically generated
 653          * size.
 654          */
 655         if (usermem == 0) {
 656                 boot_mem_map.nr_map = 0;
 657                 usermem = 1;
 658         }
 659         start = 0;
 660         size = memparse(p, &p);
 661         if (*p == '@')
 662                 start = memparse(p + 1, &p);
 663
 664         add_memory_region(start, size, BOOT_MEM_RAM);
 665
 666         if (start && start > PHYS_OFFSET)
 667                 add_memory_region(PHYS_OFFSET, start - PHYS_OFFSET,
 668                                 BOOT_MEM_RESERVED);
 669         return 0;
 670 }
 671 early_param("mem", early_parse_mem);
 672
 673 #ifdef CONFIG_PROC_VMCORE
 674 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 675 static int __init early_parse_elfcorehdr(char *p)
 676 {
 677         int i;
 678
 679         setup_elfcorehdr = memparse(p, &p);
 680
 681         for (i = 0; i < boot_mem_map.nr_map; i++) {
 682                 unsigned long start = boot_mem_map.map[i].addr;
 683                 unsigned long end = (boot_mem_map.map[i].addr +
 684                                      boot_mem_map.map[i].size);
 685                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 686                         /*
 687                          * Reserve from the elf core header to the end of
 688                          * the memory segment, that should all be kdump
 689                          * reserved memory.
 690                          */
 691                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 692                         break;
 693                 }
 694         }
 695         /*
 696          * If we don't find it in the memory map, then we shouldn't
 697          * have to worry about it, as the new kernel won't use it.
 698          */
 699         return 0;
 700 }
 701 early_param("elfcorehdr", early_parse_elfcorehdr);
 702 #endif
 703
 704 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
 705 {
 706         phys_addr_t size;
 707         int i;
 708
 709         size = end - mem;
 710         if (!size)
 711                 return;
 712
 713         /* Make sure it is in the boot_mem_map */
 714         for (i = 0; i < boot_mem_map.nr_map; i++) {
 715                 if (mem >= boot_mem_map.map[i].addr &&
 716                     mem < (boot_mem_map.map[i].addr +
 717                            boot_mem_map.map[i].size))
 718                         return;
 719         }
 720         add_memory_region(mem, size, type);
 721 }
 722
 723 #ifdef CONFIG_KEXEC
 724 static inline unsigned long long get_total_mem(void)
 725 {
 726         unsigned long long total;
 727
 728         total = max_pfn - min_low_pfn;
 729         return total << PAGE_SHIFT;
 730 }
 731
 732 static void __init mips_parse_crashkernel(void)
 733 {
 734         unsigned long long total_mem;
 735         unsigned long long crash_size, crash_base;
 736         int ret;
 737
 738         total_mem = get_total_mem();
 739         ret = parse_crashkernel(boot_command_line, total_mem,
 740                                 &crash_size, &crash_base);
 741         if (ret != 0 || crash_size <= 0)
 742                 return;
 743
 744         if (!memory_region_available(crash_base, crash_size)) {
 745                 pr_warn("Invalid memory region reserved for crash kernel\n");
 746                 return;
 747         }
 748
 749         crashk_res.start = crash_base;
 750         crashk_res.end   = crash_base + crash_size - 1;
 751 }
 752
 753 static void __init request_crashkernel(struct resource *res)
 754 {
 755         int ret;
 756
 757         if (crashk_res.start == crashk_res.end)
 758                 return;
 759
 760         ret = request_resource(res, &crashk_res);
 761         if (!ret)
 762                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 763                         (unsigned long)((crashk_res.end -
 764                                          crashk_res.start + 1) >> 20),
 765                         (unsigned long)(crashk_res.start  >> 20));
 766 }
 767 #else /* !defined(CONFIG_KEXEC)         */
 768 static void __init mips_parse_crashkernel(void)
 769 {
 770 }
 771
 772 static void __init request_crashkernel(struct resource *res)
 773 {
 774 }
 775 #endif /* !defined(CONFIG_KEXEC)  */
 776
 777 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
 778 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
 779 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
 780 #define BUILTIN_EXTEND_WITH_PROM        \
 781         IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
 782
 783 static void __init arch_mem_init(char **cmdline_p)
 784 {
 785         struct memblock_region *reg;
 786         extern void plat_mem_setup(void);
 787
 788         /* call board setup routine */
 789         plat_mem_setup();
 790
 791         /*
 792          * Make sure all kernel memory is in the maps.  The "UP" and
 793          * "DOWN" are opposite for initdata since if it crosses over
 794          * into another memory section you don't want that to be
 795          * freed when the initdata is freed.
 796          */
 797         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
 798                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
 799                          BOOT_MEM_RAM);
 800         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
 801                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
 802                          BOOT_MEM_INIT_RAM);
 803
 804         pr_info("Determined physical RAM map:\n");
 805         print_memory_map();
 806
 807 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
 808         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 809 #else
 810         if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
 811             (USE_DTB_CMDLINE && !boot_command_line[0]))
 812                 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 813
 814         if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
 815                 if (boot_command_line[0])
 816                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 817                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 818         }
 819
 820 #if defined(CONFIG_CMDLINE_BOOL)
 821         if (builtin_cmdline[0]) {
 822                 if (boot_command_line[0])
 823                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 824                 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 825         }
 826
 827         if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
 828                 if (boot_command_line[0])
 829                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 830                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 831         }
 832 #endif
 833 #endif
 834         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 835
 836         *cmdline_p = command_line;
 837
 838         parse_early_param();
 839
 840         if (usermem) {
 841                 pr_info("User-defined physical RAM map:\n");
 842                 print_memory_map();
 843         }
 844
 845         early_init_fdt_reserve_self();
 846         early_init_fdt_scan_reserved_mem();
 847
 848         bootmem_init();
 849 #ifdef CONFIG_PROC_VMCORE
 850         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 851                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 852                        setup_elfcorehdr, setup_elfcorehdr_size);
 853                 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
 854                                 BOOTMEM_DEFAULT);
 855         }
 856 #endif
 857
 858         mips_parse_crashkernel();
 859 #ifdef CONFIG_KEXEC
 860         if (crashk_res.start != crashk_res.end)
 861                 reserve_bootmem(crashk_res.start,
 862                                 crashk_res.end - crashk_res.start + 1,
 863                                 BOOTMEM_DEFAULT);
 864 #endif
 865         device_tree_init();
 866         sparse_init();
 867         plat_swiotlb_setup();
 868
 869         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 870         /* Tell bootmem about cma reserved memblock section */
 871         for_each_memblock(reserved, reg)
 872                 if (reg->size != 0)
 873                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 874
 875         reserve_bootmem_region(__pa_symbol(&__nosave_begin),
 876                         __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
 877 }
 878
 879 static void __init resource_init(void)
 880 {
 881         int i;
 882
 883         if (UNCAC_BASE != IO_BASE)
 884                 return;
 885
 886         code_resource.start = __pa_symbol(&_text);
 887         code_resource.end = __pa_symbol(&_etext) - 1;
 888         data_resource.start = __pa_symbol(&_etext);
 889         data_resource.end = __pa_symbol(&_edata) - 1;
 890
 891         for (i = 0; i < boot_mem_map.nr_map; i++) {
 892                 struct resource *res;
 893                 unsigned long start, end;
 894
 895                 start = boot_mem_map.map[i].addr;
 896                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 897                 if (start >= HIGHMEM_START)
 898                         continue;
 899                 if (end >= HIGHMEM_START)
 900                         end = HIGHMEM_START - 1;
 901
 902                 res = alloc_bootmem(sizeof(struct resource));
 903
 904                 res->start = start;
 905                 res->end = end;
 906                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 907
 908                 switch (boot_mem_map.map[i].type) {
 909                 case BOOT_MEM_RAM:
 910                 case BOOT_MEM_INIT_RAM:
 911                 case BOOT_MEM_ROM_DATA:
 912                         res->name = "System RAM";
 913                         res->flags |= IORESOURCE_SYSRAM;
 914                         break;
 915                 case BOOT_MEM_RESERVED:
 916                 default:
 917                         res->name = "reserved";
 918                 }
 919
 920                 request_resource(&iomem_resource, res);
 921
 922                 /*
 923                  *  We don't know which RAM region contains kernel data,
 924                  *  so we try it repeatedly and let the resource manager
 925                  *  test it.
 926                  */
 927                 request_resource(res, &code_resource);
 928                 request_resource(res, &data_resource);
 929                 request_crashkernel(res);
 930         }
 931 }
 932
 933 #ifdef CONFIG_SMP
 934 static void __init prefill_possible_map(void)
 935 {
 936         int i, possible = num_possible_cpus();
 937
 938         if (possible > nr_cpu_ids)
 939                 possible = nr_cpu_ids;
 940
 941         for (i = 0; i < possible; i++)
 942                 set_cpu_possible(i, true);
 943         for (; i < NR_CPUS; i++)
 944                 set_cpu_possible(i, false);
 945
 946         nr_cpu_ids = possible;
 947 }
 948 #else
 949 static inline void prefill_possible_map(void) {}
 950 #endif
 951
 952 void __init setup_arch(char **cmdline_p)
 953 {
 954         cpu_probe();
 955         mips_cm_probe();
 956         prom_init();
 957
 958         setup_early_fdc_console();
 959 #ifdef CONFIG_EARLY_PRINTK
 960         setup_early_printk();
 961 #endif
 962         cpu_report();
 963         check_bugs_early();
 964
 965 #if defined(CONFIG_VT)
 966 #if defined(CONFIG_VGA_CONSOLE)
 967         conswitchp = &vga_con;
 968 #elif defined(CONFIG_DUMMY_CONSOLE)
 969         conswitchp = &dummy_con;
 970 #endif
 971 #endif
 972
 973         arch_mem_init(cmdline_p);
 974
 975         resource_init();
 976         plat_smp_setup();
 977         prefill_possible_map();
 978
 979         cpu_cache_init();
 980         paging_init();
 981 }
 982
 983 unsigned long kernelsp[NR_CPUS];
 984 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 985
 986 #ifdef CONFIG_USE_OF
 987 unsigned long fw_passed_dtb;
 988 #endif
 989
 990 #ifdef CONFIG_DEBUG_FS
 991 struct dentry *mips_debugfs_dir;
 992 static int __init debugfs_mips(void)
 993 {
 994         struct dentry *d;
 995
 996         d = debugfs_create_dir("mips", NULL);
 997         if (!d)
 998                 return -ENOMEM;
 999         mips_debugfs_dir = d;
1000         return 0;
1001 }
1002 arch_initcall(debugfs_mips);
1003 #endif