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