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 static struct resource bss_resource = { .name = "Kernel bss", };
  84
  85 static void *detect_magic __initdata = detect_memory_region;
  86
  87 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
  88 {
  89         int x = boot_mem_map.nr_map;
  90         int i;
  91
  92         /*
  93          * If the region reaches the top of the physical address space, adjust
  94          * the size slightly so that (start + size) doesn't overflow
  95          */
  96         if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
  97                 --size;
  98
  99         /* Sanity check */
 100         if (start + size < start) {
 101                 pr_warn("Trying to add an invalid memory region, skipped\n");
 102                 return;
 103         }
 104
 105         /*
 106          * Try to merge with existing entry, if any.
 107          */
 108         for (i = 0; i < boot_mem_map.nr_map; i++) {
 109                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
 110                 unsigned long top;
 111
 112                 if (entry->type != type)
 113                         continue;
 114
 115                 if (start + size < entry->addr)
 116                         continue;                       /* no overlap */
 117
 118                 if (entry->addr + entry->size < start)
 119                         continue;                       /* no overlap */
 120
 121                 top = max(entry->addr + entry->size, start + size);
 122                 entry->addr = min(entry->addr, start);
 123                 entry->size = top - entry->addr;
 124
 125                 return;
 126         }
 127
 128         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 129                 pr_err("Ooops! Too many entries in the memory map!\n");
 130                 return;
 131         }
 132
 133         boot_mem_map.map[x].addr = start;
 134         boot_mem_map.map[x].size = size;
 135         boot_mem_map.map[x].type = type;
 136         boot_mem_map.nr_map++;
 137 }
 138
 139 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
 140 {
 141         void *dm = &detect_magic;
 142         phys_addr_t size;
 143
 144         for (size = sz_min; size < sz_max; size <<= 1) {
 145                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 146                         break;
 147         }
 148
 149         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 150                 ((unsigned long long) size) / SZ_1M,
 151                 (unsigned long long) start,
 152                 ((unsigned long long) sz_min) / SZ_1M,
 153                 ((unsigned long long) sz_max) / SZ_1M);
 154
 155         add_memory_region(start, size, BOOT_MEM_RAM);
 156 }
 157
 158 bool __init memory_region_available(phys_addr_t start, phys_addr_t size)
 159 {
 160         int i;
 161         bool in_ram = false, free = true;
 162
 163         for (i = 0; i < boot_mem_map.nr_map; i++) {
 164                 phys_addr_t start_, end_;
 165
 166                 start_ = boot_mem_map.map[i].addr;
 167                 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
 168
 169                 switch (boot_mem_map.map[i].type) {
 170                 case BOOT_MEM_RAM:
 171                         if (start >= start_ && start + size <= end_)
 172                                 in_ram = true;
 173                         break;
 174                 case BOOT_MEM_RESERVED:
 175                         if ((start >= start_ && start < end_) ||
 176                             (start < start_ && start + size >= start_))
 177                                 free = false;
 178                         break;
 179                 default:
 180                         continue;
 181                 }
 182         }
 183
 184         return in_ram && free;
 185 }
 186
 187 static void __init print_memory_map(void)
 188 {
 189         int i;
 190         const int field = 2 * sizeof(unsigned long);
 191
 192         for (i = 0; i < boot_mem_map.nr_map; i++) {
 193                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 194                        field, (unsigned long long) boot_mem_map.map[i].size,
 195                        field, (unsigned long long) boot_mem_map.map[i].addr);
 196
 197                 switch (boot_mem_map.map[i].type) {
 198                 case BOOT_MEM_RAM:
 199                         printk(KERN_CONT "(usable)\n");
 200                         break;
 201                 case BOOT_MEM_INIT_RAM:
 202                         printk(KERN_CONT "(usable after init)\n");
 203                         break;
 204                 case BOOT_MEM_ROM_DATA:
 205                         printk(KERN_CONT "(ROM data)\n");
 206                         break;
 207                 case BOOT_MEM_RESERVED:
 208                         printk(KERN_CONT "(reserved)\n");
 209                         break;
 210                 default:
 211                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 212                         break;
 213                 }
 214         }
 215 }
 216
 217 /*
 218  * Manage initrd
 219  */
 220 #ifdef CONFIG_BLK_DEV_INITRD
 221
 222 static int __init rd_start_early(char *p)
 223 {
 224         unsigned long start = memparse(p, &p);
 225
 226 #ifdef CONFIG_64BIT
 227         /* Guess if the sign extension was forgotten by bootloader */
 228         if (start < XKPHYS)
 229                 start = (int)start;
 230 #endif
 231         initrd_start = start;
 232         initrd_end += start;
 233         return 0;
 234 }
 235 early_param("rd_start", rd_start_early);
 236
 237 static int __init rd_size_early(char *p)
 238 {
 239         initrd_end += memparse(p, &p);
 240         return 0;
 241 }
 242 early_param("rd_size", rd_size_early);
 243
 244 /* it returns the next free pfn after initrd */
 245 static unsigned long __init init_initrd(void)
 246 {
 247         unsigned long end;
 248
 249         /*
 250          * Board specific code or command line parser should have
 251          * already set up initrd_start and initrd_end. In these cases
 252          * perfom sanity checks and use them if all looks good.
 253          */
 254         if (!initrd_start || initrd_end <= initrd_start)
 255                 goto disable;
 256
 257         if (initrd_start & ~PAGE_MASK) {
 258                 pr_err("initrd start must be page aligned\n");
 259                 goto disable;
 260         }
 261         if (initrd_start < PAGE_OFFSET) {
 262                 pr_err("initrd start < PAGE_OFFSET\n");
 263                 goto disable;
 264         }
 265
 266         /*
 267          * Sanitize initrd addresses. For example firmware
 268          * can't guess if they need to pass them through
 269          * 64-bits values if the kernel has been built in pure
 270          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 271          * addresses now, so the code can now safely use __pa().
 272          */
 273         end = __pa(initrd_end);
 274         initrd_end = (unsigned long)__va(end);
 275         initrd_start = (unsigned long)__va(__pa(initrd_start));
 276
 277         ROOT_DEV = Root_RAM0;
 278         return PFN_UP(end);
 279 disable:
 280         initrd_start = 0;
 281         initrd_end = 0;
 282         return 0;
 283 }
 284
 285 /* In some conditions (e.g. big endian bootloader with a little endian
 286    kernel), the initrd might appear byte swapped.  Try to detect this and
 287    byte swap it if needed.  */
 288 static void __init maybe_bswap_initrd(void)
 289 {
 290 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 291         u64 buf;
 292
 293         /* Check for CPIO signature */
 294         if (!memcmp((void *)initrd_start, "070701", 6))
 295                 return;
 296
 297         /* Check for compressed initrd */
 298         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 299                 return;
 300
 301         /* Try again with a byte swapped header */
 302         buf = swab64p((u64 *)initrd_start);
 303         if (!memcmp(&buf, "070701", 6) ||
 304             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 305                 unsigned long i;
 306
 307                 pr_info("Byteswapped initrd detected\n");
 308                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 309                         swab64s((u64 *)i);
 310         }
 311 #endif
 312 }
 313
 314 static void __init finalize_initrd(void)
 315 {
 316         unsigned long size = initrd_end - initrd_start;
 317
 318         if (size == 0) {
 319                 printk(KERN_INFO "Initrd not found or empty");
 320                 goto disable;
 321         }
 322         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 323                 printk(KERN_ERR "Initrd extends beyond end of memory");
 324                 goto disable;
 325         }
 326
 327         maybe_bswap_initrd();
 328
 329         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 330         initrd_below_start_ok = 1;
 331
 332         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 333                 initrd_start, size);
 334         return;
 335 disable:
 336         printk(KERN_CONT " - disabling initrd\n");
 337         initrd_start = 0;
 338         initrd_end = 0;
 339 }
 340
 341 #else  /* !CONFIG_BLK_DEV_INITRD */
 342
 343 static unsigned long __init init_initrd(void)
 344 {
 345         return 0;
 346 }
 347
 348 #define finalize_initrd()       do {} while (0)
 349
 350 #endif
 351
 352 /*
 353  * Initialize the bootmem allocator. It also setup initrd related data
 354  * if needed.
 355  */
 356 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
 357
 358 static void __init bootmem_init(void)
 359 {
 360         init_initrd();
 361         finalize_initrd();
 362 }
 363
 364 #else  /* !CONFIG_SGI_IP27 */
 365
 366 static unsigned long __init bootmap_bytes(unsigned long pages)
 367 {
 368         unsigned long bytes = DIV_ROUND_UP(pages, 8);
 369
 370         return ALIGN(bytes, sizeof(long));
 371 }
 372
 373 static void __init bootmem_init(void)
 374 {
 375         unsigned long reserved_end;
 376         unsigned long mapstart = ~0UL;
 377         unsigned long bootmap_size;
 378         bool bootmap_valid = false;
 379         int i;
 380
 381         /*
 382          * Sanity check any INITRD first. We don't take it into account
 383          * for bootmem setup initially, rely on the end-of-kernel-code
 384          * as our memory range starting point. Once bootmem is inited we
 385          * will reserve the area used for the initrd.
 386          */
 387         init_initrd();
 388         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 389
 390         /*
 391          * max_low_pfn is not a number of pages. The number of pages
 392          * of the system is given by 'max_low_pfn - min_low_pfn'.
 393          */
 394         min_low_pfn = ~0UL;
 395         max_low_pfn = 0;
 396
 397         /*
 398          * Find the highest page frame number we have available.
 399          */
 400         for (i = 0; i < boot_mem_map.nr_map; i++) {
 401                 unsigned long start, end;
 402
 403                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 404                         continue;
 405
 406                 start = PFN_UP(boot_mem_map.map[i].addr);
 407                 end = PFN_DOWN(boot_mem_map.map[i].addr
 408                                 + boot_mem_map.map[i].size);
 409
 410 #ifndef CONFIG_HIGHMEM
 411                 /*
 412                  * Skip highmem here so we get an accurate max_low_pfn if low
 413                  * memory stops short of high memory.
 414                  * If the region overlaps HIGHMEM_START, end is clipped so
 415                  * max_pfn excludes the highmem portion.
 416                  */
 417                 if (start >= PFN_DOWN(HIGHMEM_START))
 418                         continue;
 419                 if (end > PFN_DOWN(HIGHMEM_START))
 420                         end = PFN_DOWN(HIGHMEM_START);
 421 #endif
 422
 423                 if (end > max_low_pfn)
 424                         max_low_pfn = end;
 425                 if (start < min_low_pfn)
 426                         min_low_pfn = start;
 427                 if (end <= reserved_end)
 428                         continue;
 429 #ifdef CONFIG_BLK_DEV_INITRD
 430                 /* Skip zones before initrd and initrd itself */
 431                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
 432                         continue;
 433 #endif
 434                 if (start >= mapstart)
 435                         continue;
 436                 mapstart = max(reserved_end, start);
 437         }
 438
 439         if (min_low_pfn >= max_low_pfn)
 440                 panic("Incorrect memory mapping !!!");
 441         if (min_low_pfn > ARCH_PFN_OFFSET) {
 442                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 443                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 444                         min_low_pfn - ARCH_PFN_OFFSET);
 445         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 446                 pr_info("%lu free pages won't be used\n",
 447                         ARCH_PFN_OFFSET - min_low_pfn);
 448         }
 449         min_low_pfn = ARCH_PFN_OFFSET;
 450
 451         /*
 452          * Determine low and high memory ranges
 453          */
 454         max_pfn = max_low_pfn;
 455         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 456 #ifdef CONFIG_HIGHMEM
 457                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 458                 highend_pfn = max_low_pfn;
 459 #endif
 460                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 461         }
 462
 463 #ifdef CONFIG_BLK_DEV_INITRD
 464         /*
 465          * mapstart should be after initrd_end
 466          */
 467         if (initrd_end)
 468                 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
 469 #endif
 470
 471         /*
 472          * check that mapstart doesn't overlap with any of
 473          * memory regions that have been reserved through eg. DTB
 474          */
 475         bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
 476
 477         bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
 478                                                 bootmap_size);
 479         for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
 480                 unsigned long mapstart_addr;
 481
 482                 switch (boot_mem_map.map[i].type) {
 483                 case BOOT_MEM_RESERVED:
 484                         mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
 485                                                 boot_mem_map.map[i].size);
 486                         if (PHYS_PFN(mapstart_addr) < mapstart)
 487                                 break;
 488
 489                         bootmap_valid = memory_region_available(mapstart_addr,
 490                                                                 bootmap_size);
 491                         if (bootmap_valid)
 492                                 mapstart = PHYS_PFN(mapstart_addr);
 493                         break;
 494                 default:
 495                         break;
 496                 }
 497         }
 498
 499         if (!bootmap_valid)
 500                 panic("No memory area to place a bootmap bitmap");
 501
 502         /*
 503          * Initialize the boot-time allocator with low memory only.
 504          */
 505         if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
 506                                          min_low_pfn, max_low_pfn))
 507                 panic("Unexpected memory size required for bootmap");
 508
 509         for (i = 0; i < boot_mem_map.nr_map; i++) {
 510                 unsigned long start, end;
 511
 512                 start = PFN_UP(boot_mem_map.map[i].addr);
 513                 end = PFN_DOWN(boot_mem_map.map[i].addr
 514                                 + boot_mem_map.map[i].size);
 515
 516                 if (start <= min_low_pfn)
 517                         start = min_low_pfn;
 518                 if (start >= end)
 519                         continue;
 520
 521 #ifndef CONFIG_HIGHMEM
 522                 if (end > max_low_pfn)
 523                         end = max_low_pfn;
 524
 525                 /*
 526                  * ... finally, is the area going away?
 527                  */
 528                 if (end <= start)
 529                         continue;
 530 #endif
 531
 532                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 533         }
 534
 535         /*
 536          * Register fully available low RAM pages with the bootmem allocator.
 537          */
 538         for (i = 0; i < boot_mem_map.nr_map; i++) {
 539                 unsigned long start, end, size;
 540
 541                 start = PFN_UP(boot_mem_map.map[i].addr);
 542                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 543                                     + boot_mem_map.map[i].size);
 544
 545                 /*
 546                  * Reserve usable memory.
 547                  */
 548                 switch (boot_mem_map.map[i].type) {
 549                 case BOOT_MEM_RAM:
 550                         break;
 551                 case BOOT_MEM_INIT_RAM:
 552                         memory_present(0, start, end);
 553                         continue;
 554                 default:
 555                         /* Not usable memory */
 556                         if (start > min_low_pfn && end < max_low_pfn)
 557                                 reserve_bootmem(boot_mem_map.map[i].addr,
 558                                                 boot_mem_map.map[i].size,
 559                                                 BOOTMEM_DEFAULT);
 560                         continue;
 561                 }
 562
 563                 /*
 564                  * We are rounding up the start address of usable memory
 565                  * and at the end of the usable range downwards.
 566                  */
 567                 if (start >= max_low_pfn)
 568                         continue;
 569                 if (start < reserved_end)
 570                         start = reserved_end;
 571                 if (end > max_low_pfn)
 572                         end = max_low_pfn;
 573
 574                 /*
 575                  * ... finally, is the area going away?
 576                  */
 577                 if (end <= start)
 578                         continue;
 579                 size = end - start;
 580
 581                 /* Register lowmem ranges */
 582                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 583                 memory_present(0, start, end);
 584         }
 585
 586         /*
 587          * Reserve the bootmap memory.
 588          */
 589         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 590
 591 #ifdef CONFIG_RELOCATABLE
 592         /*
 593          * The kernel reserves all memory below its _end symbol as bootmem,
 594          * but the kernel may now be at a much higher address. The memory
 595          * between the original and new locations may be returned to the system.
 596          */
 597         if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
 598                 unsigned long offset;
 599                 extern void show_kernel_relocation(const char *level);
 600
 601                 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
 602                 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
 603
 604 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
 605                 /*
 606                  * This information is necessary when debugging the kernel
 607                  * But is a security vulnerability otherwise!
 608                  */
 609                 show_kernel_relocation(KERN_INFO);
 610 #endif
 611         }
 612 #endif
 613
 614         /*
 615          * Reserve initrd memory if needed.
 616          */
 617         finalize_initrd();
 618 }
 619
 620 #endif  /* CONFIG_SGI_IP27 */
 621
 622 /*
 623  * arch_mem_init - initialize memory management subsystem
 624  *
 625  *  o plat_mem_setup() detects the memory configuration and will record detected
 626  *    memory areas using add_memory_region.
 627  *
 628  * At this stage the memory configuration of the system is known to the
 629  * kernel but generic memory management system is still entirely uninitialized.
 630  *
 631  *  o bootmem_init()
 632  *  o sparse_init()
 633  *  o paging_init()
 634  *  o dma_contiguous_reserve()
 635  *
 636  * At this stage the bootmem allocator is ready to use.
 637  *
 638  * NOTE: historically plat_mem_setup did the entire platform initialization.
 639  *       This was rather impractical because it meant plat_mem_setup had to
 640  * get away without any kind of memory allocator.  To keep old code from
 641  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 642  * initialization hook for anything else was introduced.
 643  */
 644
 645 static int usermem __initdata;
 646
 647 static int __init early_parse_mem(char *p)
 648 {
 649         phys_addr_t start, size;
 650
 651         /*
 652          * If a user specifies memory size, we
 653          * blow away any automatically generated
 654          * size.
 655          */
 656         if (usermem == 0) {
 657                 boot_mem_map.nr_map = 0;
 658                 usermem = 1;
 659         }
 660         start = 0;
 661         size = memparse(p, &p);
 662         if (*p == '@')
 663                 start = memparse(p + 1, &p);
 664
 665         add_memory_region(start, size, BOOT_MEM_RAM);
 666
 667         if (start && start > PHYS_OFFSET)
 668                 add_memory_region(PHYS_OFFSET, start - PHYS_OFFSET,
 669                                 BOOT_MEM_RESERVED);
 670         return 0;
 671 }
 672 early_param("mem", early_parse_mem);
 673
 674 static int __init early_parse_memmap(char *p)
 675 {
 676         char *oldp;
 677         u64 start_at, mem_size;
 678
 679         if (!p)
 680                 return -EINVAL;
 681
 682         if (!strncmp(p, "exactmap", 8)) {
 683                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 684                 return 0;
 685         }
 686
 687         oldp = p;
 688         mem_size = memparse(p, &p);
 689         if (p == oldp)
 690                 return -EINVAL;
 691
 692         if (*p == '@') {
 693                 start_at = memparse(p+1, &p);
 694                 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 695         } else if (*p == '#') {
 696                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 697                 return -EINVAL;
 698         } else if (*p == '$') {
 699                 start_at = memparse(p+1, &p);
 700                 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
 701         } else {
 702                 pr_err("\"memmap\" invalid format!\n");
 703                 return -EINVAL;
 704         }
 705
 706         if (*p == '\0') {
 707                 usermem = 1;
 708                 return 0;
 709         } else
 710                 return -EINVAL;
 711 }
 712 early_param("memmap", early_parse_memmap);
 713
 714 #ifdef CONFIG_PROC_VMCORE
 715 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 716 static int __init early_parse_elfcorehdr(char *p)
 717 {
 718         int i;
 719
 720         setup_elfcorehdr = memparse(p, &p);
 721
 722         for (i = 0; i < boot_mem_map.nr_map; i++) {
 723                 unsigned long start = boot_mem_map.map[i].addr;
 724                 unsigned long end = (boot_mem_map.map[i].addr +
 725                                      boot_mem_map.map[i].size);
 726                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 727                         /*
 728                          * Reserve from the elf core header to the end of
 729                          * the memory segment, that should all be kdump
 730                          * reserved memory.
 731                          */
 732                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 733                         break;
 734                 }
 735         }
 736         /*
 737          * If we don't find it in the memory map, then we shouldn't
 738          * have to worry about it, as the new kernel won't use it.
 739          */
 740         return 0;
 741 }
 742 early_param("elfcorehdr", early_parse_elfcorehdr);
 743 #endif
 744
 745 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
 746 {
 747         phys_addr_t size;
 748         int i;
 749
 750         size = end - mem;
 751         if (!size)
 752                 return;
 753
 754         /* Make sure it is in the boot_mem_map */
 755         for (i = 0; i < boot_mem_map.nr_map; i++) {
 756                 if (mem >= boot_mem_map.map[i].addr &&
 757                     mem < (boot_mem_map.map[i].addr +
 758                            boot_mem_map.map[i].size))
 759                         return;
 760         }
 761         add_memory_region(mem, size, type);
 762 }
 763
 764 #ifdef CONFIG_KEXEC
 765 static inline unsigned long long get_total_mem(void)
 766 {
 767         unsigned long long total;
 768
 769         total = max_pfn - min_low_pfn;
 770         return total << PAGE_SHIFT;
 771 }
 772
 773 static void __init mips_parse_crashkernel(void)
 774 {
 775         unsigned long long total_mem;
 776         unsigned long long crash_size, crash_base;
 777         int ret;
 778
 779         total_mem = get_total_mem();
 780         ret = parse_crashkernel(boot_command_line, total_mem,
 781                                 &crash_size, &crash_base);
 782         if (ret != 0 || crash_size <= 0)
 783                 return;
 784
 785         if (!memory_region_available(crash_base, crash_size)) {
 786                 pr_warn("Invalid memory region reserved for crash kernel\n");
 787                 return;
 788         }
 789
 790         crashk_res.start = crash_base;
 791         crashk_res.end   = crash_base + crash_size - 1;
 792 }
 793
 794 static void __init request_crashkernel(struct resource *res)
 795 {
 796         int ret;
 797
 798         if (crashk_res.start == crashk_res.end)
 799                 return;
 800
 801         ret = request_resource(res, &crashk_res);
 802         if (!ret)
 803                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 804                         (unsigned long)((crashk_res.end -
 805                                          crashk_res.start + 1) >> 20),
 806                         (unsigned long)(crashk_res.start  >> 20));
 807 }
 808 #else /* !defined(CONFIG_KEXEC)         */
 809 static void __init mips_parse_crashkernel(void)
 810 {
 811 }
 812
 813 static void __init request_crashkernel(struct resource *res)
 814 {
 815 }
 816 #endif /* !defined(CONFIG_KEXEC)  */
 817
 818 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
 819 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
 820 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
 821 #define BUILTIN_EXTEND_WITH_PROM        \
 822         IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
 823
 824 static void __init arch_mem_init(char **cmdline_p)
 825 {
 826         struct memblock_region *reg;
 827         extern void plat_mem_setup(void);
 828
 829         /* call board setup routine */
 830         plat_mem_setup();
 831
 832         /*
 833          * Make sure all kernel memory is in the maps.  The "UP" and
 834          * "DOWN" are opposite for initdata since if it crosses over
 835          * into another memory section you don't want that to be
 836          * freed when the initdata is freed.
 837          */
 838         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
 839                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
 840                          BOOT_MEM_RAM);
 841         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
 842                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
 843                          BOOT_MEM_INIT_RAM);
 844
 845         pr_info("Determined physical RAM map:\n");
 846         print_memory_map();
 847
 848 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
 849         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 850 #else
 851         if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
 852             (USE_DTB_CMDLINE && !boot_command_line[0]))
 853                 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 854
 855         if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
 856                 if (boot_command_line[0])
 857                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 858                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 859         }
 860
 861 #if defined(CONFIG_CMDLINE_BOOL)
 862         if (builtin_cmdline[0]) {
 863                 if (boot_command_line[0])
 864                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 865                 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 866         }
 867
 868         if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
 869                 if (boot_command_line[0])
 870                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 871                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 872         }
 873 #endif
 874 #endif
 875         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 876
 877         *cmdline_p = command_line;
 878
 879         parse_early_param();
 880
 881         if (usermem) {
 882                 pr_info("User-defined physical RAM map:\n");
 883                 print_memory_map();
 884         }
 885
 886         early_init_fdt_reserve_self();
 887         early_init_fdt_scan_reserved_mem();
 888
 889         bootmem_init();
 890 #ifdef CONFIG_PROC_VMCORE
 891         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 892                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 893                        setup_elfcorehdr, setup_elfcorehdr_size);
 894                 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
 895                                 BOOTMEM_DEFAULT);
 896         }
 897 #endif
 898
 899         mips_parse_crashkernel();
 900 #ifdef CONFIG_KEXEC
 901         if (crashk_res.start != crashk_res.end)
 902                 reserve_bootmem(crashk_res.start,
 903                                 crashk_res.end - crashk_res.start + 1,
 904                                 BOOTMEM_DEFAULT);
 905 #endif
 906         device_tree_init();
 907         sparse_init();
 908         plat_swiotlb_setup();
 909
 910         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 911         /* Tell bootmem about cma reserved memblock section */
 912         for_each_memblock(reserved, reg)
 913                 if (reg->size != 0)
 914                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 915
 916         reserve_bootmem_region(__pa_symbol(&__nosave_begin),
 917                         __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
 918 }
 919
 920 static void __init resource_init(void)
 921 {
 922         int i;
 923
 924         if (UNCAC_BASE != IO_BASE)
 925                 return;
 926
 927         code_resource.start = __pa_symbol(&_text);
 928         code_resource.end = __pa_symbol(&_etext) - 1;
 929         data_resource.start = __pa_symbol(&_etext);
 930         data_resource.end = __pa_symbol(&_edata) - 1;
 931         bss_resource.start = __pa_symbol(&__bss_start);
 932         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 933
 934         for (i = 0; i < boot_mem_map.nr_map; i++) {
 935                 struct resource *res;
 936                 unsigned long start, end;
 937
 938                 start = boot_mem_map.map[i].addr;
 939                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 940                 if (start >= HIGHMEM_START)
 941                         continue;
 942                 if (end >= HIGHMEM_START)
 943                         end = HIGHMEM_START - 1;
 944
 945                 res = alloc_bootmem(sizeof(struct resource));
 946
 947                 res->start = start;
 948                 res->end = end;
 949                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 950
 951                 switch (boot_mem_map.map[i].type) {
 952                 case BOOT_MEM_RAM:
 953                 case BOOT_MEM_INIT_RAM:
 954                 case BOOT_MEM_ROM_DATA:
 955                         res->name = "System RAM";
 956                         res->flags |= IORESOURCE_SYSRAM;
 957                         break;
 958                 case BOOT_MEM_RESERVED:
 959                 default:
 960                         res->name = "reserved";
 961                 }
 962
 963                 request_resource(&iomem_resource, res);
 964
 965                 /*
 966                  *  We don't know which RAM region contains kernel data,
 967                  *  so we try it repeatedly and let the resource manager
 968                  *  test it.
 969                  */
 970                 request_resource(res, &code_resource);
 971                 request_resource(res, &data_resource);
 972                 request_resource(res, &bss_resource);
 973                 request_crashkernel(res);
 974         }
 975 }
 976
 977 #ifdef CONFIG_SMP
 978 static void __init prefill_possible_map(void)
 979 {
 980         int i, possible = num_possible_cpus();
 981
 982         if (possible > nr_cpu_ids)
 983                 possible = nr_cpu_ids;
 984
 985         for (i = 0; i < possible; i++)
 986                 set_cpu_possible(i, true);
 987         for (; i < NR_CPUS; i++)
 988                 set_cpu_possible(i, false);
 989
 990         nr_cpu_ids = possible;
 991 }
 992 #else
 993 static inline void prefill_possible_map(void) {}
 994 #endif
 995
 996 void __init setup_arch(char **cmdline_p)
 997 {
 998         cpu_probe();
 999         mips_cm_probe();
1000         prom_init();
1001
1002         setup_early_fdc_console();
1003 #ifdef CONFIG_EARLY_PRINTK
1004         setup_early_printk();
1005 #endif
1006         cpu_report();
1007         check_bugs_early();
1008
1009 #if defined(CONFIG_VT)
1010 #if defined(CONFIG_VGA_CONSOLE)
1011         conswitchp = &vga_con;
1012 #elif defined(CONFIG_DUMMY_CONSOLE)
1013         conswitchp = &dummy_con;
1014 #endif
1015 #endif
1016
1017         arch_mem_init(cmdline_p);
1018
1019         resource_init();
1020         plat_smp_setup();
1021         prefill_possible_map();
1022
1023         cpu_cache_init();
1024         paging_init();
1025 }
1026
1027 unsigned long kernelsp[NR_CPUS];
1028 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
1029
1030 #ifdef CONFIG_USE_OF
1031 unsigned long fw_passed_dtb;
1032 #endif
1033
1034 #ifdef CONFIG_DEBUG_FS
1035 struct dentry *mips_debugfs_dir;
1036 static int __init debugfs_mips(void)
1037 {
1038         struct dentry *d;
1039
1040         d = debugfs_create_dir("mips", NULL);
1041         if (!d)
1042                 return -ENOMEM;
1043         mips_debugfs_dir = d;
1044         return 0;
1045 }
1046 arch_initcall(debugfs_mips);
1047 #endif