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 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
 261         /*
 262          * Sanitize initrd addresses. For example firmware
 263          * can't guess if they need to pass them through
 264          * 64-bits values if the kernel has been built in pure
 265          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 266          * addresses now, so the code can now safely use __pa().
 267          */
 268         end = __pa(initrd_end);
 269         initrd_end = (unsigned long)__va(end);
 270         initrd_start = (unsigned long)__va(__pa(initrd_start));
 271
 272         if (initrd_start < PAGE_OFFSET) {
 273                 pr_err("initrd start < PAGE_OFFSET\n");
 274                 goto disable;
 275         }
 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         phys_addr_t ramstart = (phys_addr_t)ULLONG_MAX;
 379         bool bootmap_valid = false;
 380         int i;
 381
 382         /*
 383          * Sanity check any INITRD first. We don't take it into account
 384          * for bootmem setup initially, rely on the end-of-kernel-code
 385          * as our memory range starting point. Once bootmem is inited we
 386          * will reserve the area used for the initrd.
 387          */
 388         init_initrd();
 389         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 390
 391         /*
 392          * max_low_pfn is not a number of pages. The number of pages
 393          * of the system is given by 'max_low_pfn - min_low_pfn'.
 394          */
 395         min_low_pfn = ~0UL;
 396         max_low_pfn = 0;
 397
 398         /*
 399          * Find the highest page frame number we have available
 400          * and the lowest used RAM address
 401          */
 402         for (i = 0; i < boot_mem_map.nr_map; i++) {
 403                 unsigned long start, end;
 404
 405                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 406                         continue;
 407
 408                 start = PFN_UP(boot_mem_map.map[i].addr);
 409                 end = PFN_DOWN(boot_mem_map.map[i].addr
 410                                 + boot_mem_map.map[i].size);
 411
 412                 ramstart = min(ramstart, boot_mem_map.map[i].addr);
 413
 414 #ifndef CONFIG_HIGHMEM
 415                 /*
 416                  * Skip highmem here so we get an accurate max_low_pfn if low
 417                  * memory stops short of high memory.
 418                  * If the region overlaps HIGHMEM_START, end is clipped so
 419                  * max_pfn excludes the highmem portion.
 420                  */
 421                 if (start >= PFN_DOWN(HIGHMEM_START))
 422                         continue;
 423                 if (end > PFN_DOWN(HIGHMEM_START))
 424                         end = PFN_DOWN(HIGHMEM_START);
 425 #endif
 426
 427                 if (end > max_low_pfn)
 428                         max_low_pfn = end;
 429                 if (start < min_low_pfn)
 430                         min_low_pfn = start;
 431                 if (end <= reserved_end)
 432                         continue;
 433 #ifdef CONFIG_BLK_DEV_INITRD
 434                 /* Skip zones before initrd and initrd itself */
 435                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
 436                         continue;
 437 #endif
 438                 if (start >= mapstart)
 439                         continue;
 440                 mapstart = max(reserved_end, start);
 441         }
 442
 443         /*
 444          * Reserve any memory between the start of RAM and PHYS_OFFSET
 445          */
 446         if (ramstart > PHYS_OFFSET)
 447                 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
 448                                   BOOT_MEM_RESERVED);
 449
 450         if (min_low_pfn >= max_low_pfn)
 451                 panic("Incorrect memory mapping !!!");
 452         if (min_low_pfn > ARCH_PFN_OFFSET) {
 453                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 454                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 455                         min_low_pfn - ARCH_PFN_OFFSET);
 456         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 457                 pr_info("%lu free pages won't be used\n",
 458                         ARCH_PFN_OFFSET - min_low_pfn);
 459         }
 460         min_low_pfn = ARCH_PFN_OFFSET;
 461
 462         /*
 463          * Determine low and high memory ranges
 464          */
 465         max_pfn = max_low_pfn;
 466         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 467 #ifdef CONFIG_HIGHMEM
 468                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 469                 highend_pfn = max_low_pfn;
 470 #endif
 471                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 472         }
 473
 474 #ifdef CONFIG_BLK_DEV_INITRD
 475         /*
 476          * mapstart should be after initrd_end
 477          */
 478         if (initrd_end)
 479                 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
 480 #endif
 481
 482         /*
 483          * check that mapstart doesn't overlap with any of
 484          * memory regions that have been reserved through eg. DTB
 485          */
 486         bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
 487
 488         bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
 489                                                 bootmap_size);
 490         for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
 491                 unsigned long mapstart_addr;
 492
 493                 switch (boot_mem_map.map[i].type) {
 494                 case BOOT_MEM_RESERVED:
 495                         mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
 496                                                 boot_mem_map.map[i].size);
 497                         if (PHYS_PFN(mapstart_addr) < mapstart)
 498                                 break;
 499
 500                         bootmap_valid = memory_region_available(mapstart_addr,
 501                                                                 bootmap_size);
 502                         if (bootmap_valid)
 503                                 mapstart = PHYS_PFN(mapstart_addr);
 504                         break;
 505                 default:
 506                         break;
 507                 }
 508         }
 509
 510         if (!bootmap_valid)
 511                 panic("No memory area to place a bootmap bitmap");
 512
 513         /*
 514          * Initialize the boot-time allocator with low memory only.
 515          */
 516         if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
 517                                          min_low_pfn, max_low_pfn))
 518                 panic("Unexpected memory size required for bootmap");
 519
 520         for (i = 0; i < boot_mem_map.nr_map; i++) {
 521                 unsigned long start, end;
 522
 523                 start = PFN_UP(boot_mem_map.map[i].addr);
 524                 end = PFN_DOWN(boot_mem_map.map[i].addr
 525                                 + boot_mem_map.map[i].size);
 526
 527                 if (start <= min_low_pfn)
 528                         start = min_low_pfn;
 529                 if (start >= end)
 530                         continue;
 531
 532 #ifndef CONFIG_HIGHMEM
 533                 if (end > max_low_pfn)
 534                         end = max_low_pfn;
 535
 536                 /*
 537                  * ... finally, is the area going away?
 538                  */
 539                 if (end <= start)
 540                         continue;
 541 #endif
 542
 543                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 544         }
 545
 546         /*
 547          * Register fully available low RAM pages with the bootmem allocator.
 548          */
 549         for (i = 0; i < boot_mem_map.nr_map; i++) {
 550                 unsigned long start, end, size;
 551
 552                 start = PFN_UP(boot_mem_map.map[i].addr);
 553                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 554                                     + boot_mem_map.map[i].size);
 555
 556                 /*
 557                  * Reserve usable memory.
 558                  */
 559                 switch (boot_mem_map.map[i].type) {
 560                 case BOOT_MEM_RAM:
 561                         break;
 562                 case BOOT_MEM_INIT_RAM:
 563                         memory_present(0, start, end);
 564                         continue;
 565                 default:
 566                         /* Not usable memory */
 567                         if (start > min_low_pfn && end < max_low_pfn)
 568                                 reserve_bootmem(boot_mem_map.map[i].addr,
 569                                                 boot_mem_map.map[i].size,
 570                                                 BOOTMEM_DEFAULT);
 571                         continue;
 572                 }
 573
 574                 /*
 575                  * We are rounding up the start address of usable memory
 576                  * and at the end of the usable range downwards.
 577                  */
 578                 if (start >= max_low_pfn)
 579                         continue;
 580                 if (start < reserved_end)
 581                         start = reserved_end;
 582                 if (end > max_low_pfn)
 583                         end = max_low_pfn;
 584
 585                 /*
 586                  * ... finally, is the area going away?
 587                  */
 588                 if (end <= start)
 589                         continue;
 590                 size = end - start;
 591
 592                 /* Register lowmem ranges */
 593                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 594                 memory_present(0, start, end);
 595         }
 596
 597         /*
 598          * Reserve the bootmap memory.
 599          */
 600         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 601
 602 #ifdef CONFIG_RELOCATABLE
 603         /*
 604          * The kernel reserves all memory below its _end symbol as bootmem,
 605          * but the kernel may now be at a much higher address. The memory
 606          * between the original and new locations may be returned to the system.
 607          */
 608         if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
 609                 unsigned long offset;
 610                 extern void show_kernel_relocation(const char *level);
 611
 612                 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
 613                 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
 614
 615 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
 616                 /*
 617                  * This information is necessary when debugging the kernel
 618                  * But is a security vulnerability otherwise!
 619                  */
 620                 show_kernel_relocation(KERN_INFO);
 621 #endif
 622         }
 623 #endif
 624
 625         /*
 626          * Reserve initrd memory if needed.
 627          */
 628         finalize_initrd();
 629 }
 630
 631 #endif  /* CONFIG_SGI_IP27 */
 632
 633 /*
 634  * arch_mem_init - initialize memory management subsystem
 635  *
 636  *  o plat_mem_setup() detects the memory configuration and will record detected
 637  *    memory areas using add_memory_region.
 638  *
 639  * At this stage the memory configuration of the system is known to the
 640  * kernel but generic memory management system is still entirely uninitialized.
 641  *
 642  *  o bootmem_init()
 643  *  o sparse_init()
 644  *  o paging_init()
 645  *  o dma_contiguous_reserve()
 646  *
 647  * At this stage the bootmem allocator is ready to use.
 648  *
 649  * NOTE: historically plat_mem_setup did the entire platform initialization.
 650  *       This was rather impractical because it meant plat_mem_setup had to
 651  * get away without any kind of memory allocator.  To keep old code from
 652  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 653  * initialization hook for anything else was introduced.
 654  */
 655
 656 static int usermem __initdata;
 657
 658 static int __init early_parse_mem(char *p)
 659 {
 660         phys_addr_t start, size;
 661
 662         /*
 663          * If a user specifies memory size, we
 664          * blow away any automatically generated
 665          * size.
 666          */
 667         if (usermem == 0) {
 668                 boot_mem_map.nr_map = 0;
 669                 usermem = 1;
 670         }
 671         start = 0;
 672         size = memparse(p, &p);
 673         if (*p == '@')
 674                 start = memparse(p + 1, &p);
 675
 676         add_memory_region(start, size, BOOT_MEM_RAM);
 677
 678         return 0;
 679 }
 680 early_param("mem", early_parse_mem);
 681
 682 static int __init early_parse_memmap(char *p)
 683 {
 684         char *oldp;
 685         u64 start_at, mem_size;
 686
 687         if (!p)
 688                 return -EINVAL;
 689
 690         if (!strncmp(p, "exactmap", 8)) {
 691                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 692                 return 0;
 693         }
 694
 695         oldp = p;
 696         mem_size = memparse(p, &p);
 697         if (p == oldp)
 698                 return -EINVAL;
 699
 700         if (*p == '@') {
 701                 start_at = memparse(p+1, &p);
 702                 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 703         } else if (*p == '#') {
 704                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 705                 return -EINVAL;
 706         } else if (*p == '$') {
 707                 start_at = memparse(p+1, &p);
 708                 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
 709         } else {
 710                 pr_err("\"memmap\" invalid format!\n");
 711                 return -EINVAL;
 712         }
 713
 714         if (*p == '\0') {
 715                 usermem = 1;
 716                 return 0;
 717         } else
 718                 return -EINVAL;
 719 }
 720 early_param("memmap", early_parse_memmap);
 721
 722 #ifdef CONFIG_PROC_VMCORE
 723 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 724 static int __init early_parse_elfcorehdr(char *p)
 725 {
 726         int i;
 727
 728         setup_elfcorehdr = memparse(p, &p);
 729
 730         for (i = 0; i < boot_mem_map.nr_map; i++) {
 731                 unsigned long start = boot_mem_map.map[i].addr;
 732                 unsigned long end = (boot_mem_map.map[i].addr +
 733                                      boot_mem_map.map[i].size);
 734                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 735                         /*
 736                          * Reserve from the elf core header to the end of
 737                          * the memory segment, that should all be kdump
 738                          * reserved memory.
 739                          */
 740                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 741                         break;
 742                 }
 743         }
 744         /*
 745          * If we don't find it in the memory map, then we shouldn't
 746          * have to worry about it, as the new kernel won't use it.
 747          */
 748         return 0;
 749 }
 750 early_param("elfcorehdr", early_parse_elfcorehdr);
 751 #endif
 752
 753 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
 754 {
 755         phys_addr_t size;
 756         int i;
 757
 758         size = end - mem;
 759         if (!size)
 760                 return;
 761
 762         /* Make sure it is in the boot_mem_map */
 763         for (i = 0; i < boot_mem_map.nr_map; i++) {
 764                 if (mem >= boot_mem_map.map[i].addr &&
 765                     mem < (boot_mem_map.map[i].addr +
 766                            boot_mem_map.map[i].size))
 767                         return;
 768         }
 769         add_memory_region(mem, size, type);
 770 }
 771
 772 #ifdef CONFIG_KEXEC
 773 static inline unsigned long long get_total_mem(void)
 774 {
 775         unsigned long long total;
 776
 777         total = max_pfn - min_low_pfn;
 778         return total << PAGE_SHIFT;
 779 }
 780
 781 static void __init mips_parse_crashkernel(void)
 782 {
 783         unsigned long long total_mem;
 784         unsigned long long crash_size, crash_base;
 785         int ret;
 786
 787         total_mem = get_total_mem();
 788         ret = parse_crashkernel(boot_command_line, total_mem,
 789                                 &crash_size, &crash_base);
 790         if (ret != 0 || crash_size <= 0)
 791                 return;
 792
 793         if (!memory_region_available(crash_base, crash_size)) {
 794                 pr_warn("Invalid memory region reserved for crash kernel\n");
 795                 return;
 796         }
 797
 798         crashk_res.start = crash_base;
 799         crashk_res.end   = crash_base + crash_size - 1;
 800 }
 801
 802 static void __init request_crashkernel(struct resource *res)
 803 {
 804         int ret;
 805
 806         if (crashk_res.start == crashk_res.end)
 807                 return;
 808
 809         ret = request_resource(res, &crashk_res);
 810         if (!ret)
 811                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 812                         (unsigned long)((crashk_res.end -
 813                                          crashk_res.start + 1) >> 20),
 814                         (unsigned long)(crashk_res.start  >> 20));
 815 }
 816 #else /* !defined(CONFIG_KEXEC)         */
 817 static void __init mips_parse_crashkernel(void)
 818 {
 819 }
 820
 821 static void __init request_crashkernel(struct resource *res)
 822 {
 823 }
 824 #endif /* !defined(CONFIG_KEXEC)  */
 825
 826 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
 827 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
 828 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
 829 #define BUILTIN_EXTEND_WITH_PROM        \
 830         IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
 831
 832 static void __init arch_mem_init(char **cmdline_p)
 833 {
 834         struct memblock_region *reg;
 835         extern void plat_mem_setup(void);
 836
 837         /* call board setup routine */
 838         plat_mem_setup();
 839
 840         /*
 841          * Make sure all kernel memory is in the maps.  The "UP" and
 842          * "DOWN" are opposite for initdata since if it crosses over
 843          * into another memory section you don't want that to be
 844          * freed when the initdata is freed.
 845          */
 846         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
 847                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
 848                          BOOT_MEM_RAM);
 849         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
 850                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
 851                          BOOT_MEM_INIT_RAM);
 852
 853         pr_info("Determined physical RAM map:\n");
 854         print_memory_map();
 855
 856 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
 857         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 858 #else
 859         if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
 860             (USE_DTB_CMDLINE && !boot_command_line[0]))
 861                 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 862
 863         if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
 864                 if (boot_command_line[0])
 865                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 866                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 867         }
 868
 869 #if defined(CONFIG_CMDLINE_BOOL)
 870         if (builtin_cmdline[0]) {
 871                 if (boot_command_line[0])
 872                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 873                 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 874         }
 875
 876         if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
 877                 if (boot_command_line[0])
 878                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 879                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 880         }
 881 #endif
 882 #endif
 883         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 884
 885         *cmdline_p = command_line;
 886
 887         parse_early_param();
 888
 889         if (usermem) {
 890                 pr_info("User-defined physical RAM map:\n");
 891                 print_memory_map();
 892         }
 893
 894         early_init_fdt_reserve_self();
 895         early_init_fdt_scan_reserved_mem();
 896
 897         bootmem_init();
 898 #ifdef CONFIG_PROC_VMCORE
 899         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 900                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 901                        setup_elfcorehdr, setup_elfcorehdr_size);
 902                 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
 903                                 BOOTMEM_DEFAULT);
 904         }
 905 #endif
 906
 907         mips_parse_crashkernel();
 908 #ifdef CONFIG_KEXEC
 909         if (crashk_res.start != crashk_res.end)
 910                 reserve_bootmem(crashk_res.start,
 911                                 crashk_res.end - crashk_res.start + 1,
 912                                 BOOTMEM_DEFAULT);
 913 #endif
 914         device_tree_init();
 915
 916         /*
 917          * In order to reduce the possibility of kernel panic when failed to
 918          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
 919          * low memory as small as possible before plat_swiotlb_setup(), so
 920          * make sparse_init() using top-down allocation.
 921          */
 922         memblock_set_bottom_up(false);
 923         sparse_init();
 924         memblock_set_bottom_up(true);
 925
 926         plat_swiotlb_setup();
 927
 928         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 929         /* Tell bootmem about cma reserved memblock section */
 930         for_each_memblock(reserved, reg)
 931                 if (reg->size != 0)
 932                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 933
 934         reserve_bootmem_region(__pa_symbol(&__nosave_begin),
 935                         __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
 936 }
 937
 938 static void __init resource_init(void)
 939 {
 940         int i;
 941
 942         if (UNCAC_BASE != IO_BASE)
 943                 return;
 944
 945         code_resource.start = __pa_symbol(&_text);
 946         code_resource.end = __pa_symbol(&_etext) - 1;
 947         data_resource.start = __pa_symbol(&_etext);
 948         data_resource.end = __pa_symbol(&_edata) - 1;
 949
 950         for (i = 0; i < boot_mem_map.nr_map; i++) {
 951                 struct resource *res;
 952                 unsigned long start, end;
 953
 954                 start = boot_mem_map.map[i].addr;
 955                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 956                 if (start >= HIGHMEM_START)
 957                         continue;
 958                 if (end >= HIGHMEM_START)
 959                         end = HIGHMEM_START - 1;
 960
 961                 res = alloc_bootmem(sizeof(struct resource));
 962
 963                 res->start = start;
 964                 res->end = end;
 965                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 966
 967                 switch (boot_mem_map.map[i].type) {
 968                 case BOOT_MEM_RAM:
 969                 case BOOT_MEM_INIT_RAM:
 970                 case BOOT_MEM_ROM_DATA:
 971                         res->name = "System RAM";
 972                         res->flags |= IORESOURCE_SYSRAM;
 973                         break;
 974                 case BOOT_MEM_RESERVED:
 975                 default:
 976                         res->name = "reserved";
 977                 }
 978
 979                 request_resource(&iomem_resource, res);
 980
 981                 /*
 982                  *  We don't know which RAM region contains kernel data,
 983                  *  so we try it repeatedly and let the resource manager
 984                  *  test it.
 985                  */
 986                 request_resource(res, &code_resource);
 987                 request_resource(res, &data_resource);
 988                 request_crashkernel(res);
 989         }
 990 }
 991
 992 #ifdef CONFIG_SMP
 993 static void __init prefill_possible_map(void)
 994 {
 995         int i, possible = num_possible_cpus();
 996
 997         if (possible > nr_cpu_ids)
 998                 possible = nr_cpu_ids;
 999
1000         for (i = 0; i < possible; i++)
1001                 set_cpu_possible(i, true);
1002         for (; i < NR_CPUS; i++)
1003                 set_cpu_possible(i, false);
1004
1005         nr_cpu_ids = possible;
1006 }
1007 #else
1008 static inline void prefill_possible_map(void) {}
1009 #endif
1010
1011 void __init setup_arch(char **cmdline_p)
1012 {
1013         cpu_probe();
1014         mips_cm_probe();
1015         prom_init();
1016
1017         setup_early_fdc_console();
1018 #ifdef CONFIG_EARLY_PRINTK
1019         setup_early_printk();
1020 #endif
1021         cpu_report();
1022         check_bugs_early();
1023
1024 #if defined(CONFIG_VT)
1025 #if defined(CONFIG_VGA_CONSOLE)
1026         conswitchp = &vga_con;
1027 #elif defined(CONFIG_DUMMY_CONSOLE)
1028         conswitchp = &dummy_con;
1029 #endif
1030 #endif
1031
1032         arch_mem_init(cmdline_p);
1033
1034         resource_init();
1035         plat_smp_setup();
1036         prefill_possible_map();
1037
1038         cpu_cache_init();
1039         paging_init();
1040 }
1041
1042 unsigned long kernelsp[NR_CPUS];
1043 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
1044
1045 #ifdef CONFIG_USE_OF
1046 unsigned long fw_passed_dtb;
1047 #endif
1048
1049 #ifdef CONFIG_DEBUG_FS
1050 struct dentry *mips_debugfs_dir;
1051 static int __init debugfs_mips(void)
1052 {
1053         struct dentry *d;
1054
1055         d = debugfs_create_dir("mips", NULL);
1056         if (!d)
1057                 return -ENOMEM;
1058         mips_debugfs_dir = d;
1059         return 0;
1060 }
1061 arch_initcall(debugfs_mips);
1062 #endif