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_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 static bool __init __maybe_unused memory_region_available(phys_addr_t start,
 159                                                           phys_addr_t size)
 160 {
 161         int i;
 162         bool in_ram = false, free = true;
 163
 164         for (i = 0; i < boot_mem_map.nr_map; i++) {
 165                 phys_addr_t start_, end_;
 166
 167                 start_ = boot_mem_map.map[i].addr;
 168                 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
 169
 170                 switch (boot_mem_map.map[i].type) {
 171                 case BOOT_MEM_RAM:
 172                         if (start >= start_ && start + size <= end_)
 173                                 in_ram = true;
 174                         break;
 175                 case BOOT_MEM_RESERVED:
 176                         if ((start >= start_ && start < end_) ||
 177                             (start < start_ && start + size >= start_))
 178                                 free = false;
 179                         break;
 180                 default:
 181                         continue;
 182                 }
 183         }
 184
 185         return in_ram && free;
 186 }
 187
 188 static void __init print_memory_map(void)
 189 {
 190         int i;
 191         const int field = 2 * sizeof(unsigned long);
 192
 193         for (i = 0; i < boot_mem_map.nr_map; i++) {
 194                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 195                        field, (unsigned long long) boot_mem_map.map[i].size,
 196                        field, (unsigned long long) boot_mem_map.map[i].addr);
 197
 198                 switch (boot_mem_map.map[i].type) {
 199                 case BOOT_MEM_RAM:
 200                         printk(KERN_CONT "(usable)\n");
 201                         break;
 202                 case BOOT_MEM_INIT_RAM:
 203                         printk(KERN_CONT "(usable after init)\n");
 204                         break;
 205                 case BOOT_MEM_ROM_DATA:
 206                         printk(KERN_CONT "(ROM data)\n");
 207                         break;
 208                 case BOOT_MEM_RESERVED:
 209                         printk(KERN_CONT "(reserved)\n");
 210                         break;
 211                 default:
 212                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 213                         break;
 214                 }
 215         }
 216 }
 217
 218 /*
 219  * Manage initrd
 220  */
 221 #ifdef CONFIG_BLK_DEV_INITRD
 222
 223 static int __init rd_start_early(char *p)
 224 {
 225         unsigned long start = memparse(p, &p);
 226
 227 #ifdef CONFIG_64BIT
 228         /* Guess if the sign extension was forgotten by bootloader */
 229         if (start < XKPHYS)
 230                 start = (int)start;
 231 #endif
 232         initrd_start = start;
 233         initrd_end += start;
 234         return 0;
 235 }
 236 early_param("rd_start", rd_start_early);
 237
 238 static int __init rd_size_early(char *p)
 239 {
 240         initrd_end += memparse(p, &p);
 241         return 0;
 242 }
 243 early_param("rd_size", rd_size_early);
 244
 245 /* it returns the next free pfn after initrd */
 246 static unsigned long __init init_initrd(void)
 247 {
 248         unsigned long end;
 249
 250         /*
 251          * Board specific code or command line parser should have
 252          * already set up initrd_start and initrd_end. In these cases
 253          * perfom sanity checks and use them if all looks good.
 254          */
 255         if (!initrd_start || initrd_end <= initrd_start)
 256                 goto disable;
 257
 258         if (initrd_start & ~PAGE_MASK) {
 259                 pr_err("initrd start must be page aligned\n");
 260                 goto disable;
 261         }
 262         if (initrd_start < PAGE_OFFSET) {
 263                 pr_err("initrd start < PAGE_OFFSET\n");
 264                 goto disable;
 265         }
 266
 267         /*
 268          * Sanitize initrd addresses. For example firmware
 269          * can't guess if they need to pass them through
 270          * 64-bits values if the kernel has been built in pure
 271          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 272          * addresses now, so the code can now safely use __pa().
 273          */
 274         end = __pa(initrd_end);
 275         initrd_end = (unsigned long)__va(end);
 276         initrd_start = (unsigned long)__va(__pa(initrd_start));
 277
 278         ROOT_DEV = Root_RAM0;
 279         return PFN_UP(end);
 280 disable:
 281         initrd_start = 0;
 282         initrd_end = 0;
 283         return 0;
 284 }
 285
 286 /* In some conditions (e.g. big endian bootloader with a little endian
 287    kernel), the initrd might appear byte swapped.  Try to detect this and
 288    byte swap it if needed.  */
 289 static void __init maybe_bswap_initrd(void)
 290 {
 291 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 292         u64 buf;
 293
 294         /* Check for CPIO signature */
 295         if (!memcmp((void *)initrd_start, "070701", 6))
 296                 return;
 297
 298         /* Check for compressed initrd */
 299         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 300                 return;
 301
 302         /* Try again with a byte swapped header */
 303         buf = swab64p((u64 *)initrd_start);
 304         if (!memcmp(&buf, "070701", 6) ||
 305             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 306                 unsigned long i;
 307
 308                 pr_info("Byteswapped initrd detected\n");
 309                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 310                         swab64s((u64 *)i);
 311         }
 312 #endif
 313 }
 314
 315 static void __init finalize_initrd(void)
 316 {
 317         unsigned long size = initrd_end - initrd_start;
 318
 319         if (size == 0) {
 320                 printk(KERN_INFO "Initrd not found or empty");
 321                 goto disable;
 322         }
 323         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 324                 printk(KERN_ERR "Initrd extends beyond end of memory");
 325                 goto disable;
 326         }
 327
 328         maybe_bswap_initrd();
 329
 330         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 331         initrd_below_start_ok = 1;
 332
 333         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 334                 initrd_start, size);
 335         return;
 336 disable:
 337         printk(KERN_CONT " - disabling initrd\n");
 338         initrd_start = 0;
 339         initrd_end = 0;
 340 }
 341
 342 #else  /* !CONFIG_BLK_DEV_INITRD */
 343
 344 static unsigned long __init init_initrd(void)
 345 {
 346         return 0;
 347 }
 348
 349 #define finalize_initrd()       do {} while (0)
 350
 351 #endif
 352
 353 /*
 354  * Initialize the bootmem allocator. It also setup initrd related data
 355  * if needed.
 356  */
 357 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
 358
 359 static void __init bootmem_init(void)
 360 {
 361         init_initrd();
 362         finalize_initrd();
 363 }
 364
 365 #else  /* !CONFIG_SGI_IP27 */
 366
 367 static unsigned long __init bootmap_bytes(unsigned long pages)
 368 {
 369         unsigned long bytes = DIV_ROUND_UP(pages, 8);
 370
 371         return ALIGN(bytes, sizeof(long));
 372 }
 373
 374 static void __init bootmem_init(void)
 375 {
 376         unsigned long reserved_end;
 377         unsigned long mapstart = ~0UL;
 378         unsigned long bootmap_size;
 379         phys_addr_t ramstart = PHYS_ADDR_MAX;
 380         bool bootmap_valid = false;
 381         int i;
 382
 383         /*
 384          * Sanity check any INITRD first. We don't take it into account
 385          * for bootmem setup initially, rely on the end-of-kernel-code
 386          * as our memory range starting point. Once bootmem is inited we
 387          * will reserve the area used for the initrd.
 388          */
 389         init_initrd();
 390         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 391
 392         /*
 393          * max_low_pfn is not a number of pages. The number of pages
 394          * of the system is given by 'max_low_pfn - min_low_pfn'.
 395          */
 396         min_low_pfn = ~0UL;
 397         max_low_pfn = 0;
 398
 399         /*
 400          * Find the highest page frame number we have available
 401          * and the lowest used RAM address
 402          */
 403         for (i = 0; i < boot_mem_map.nr_map; i++) {
 404                 unsigned long start, end;
 405
 406                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 407                         continue;
 408
 409                 start = PFN_UP(boot_mem_map.map[i].addr);
 410                 end = PFN_DOWN(boot_mem_map.map[i].addr
 411                                 + boot_mem_map.map[i].size);
 412
 413                 ramstart = min(ramstart, boot_mem_map.map[i].addr);
 414
 415 #ifndef CONFIG_HIGHMEM
 416                 /*
 417                  * Skip highmem here so we get an accurate max_low_pfn if low
 418                  * memory stops short of high memory.
 419                  * If the region overlaps HIGHMEM_START, end is clipped so
 420                  * max_pfn excludes the highmem portion.
 421                  */
 422                 if (start >= PFN_DOWN(HIGHMEM_START))
 423                         continue;
 424                 if (end > PFN_DOWN(HIGHMEM_START))
 425                         end = PFN_DOWN(HIGHMEM_START);
 426 #endif
 427
 428                 if (end > max_low_pfn)
 429                         max_low_pfn = end;
 430                 if (start < min_low_pfn)
 431                         min_low_pfn = start;
 432                 if (end <= reserved_end)
 433                         continue;
 434 #ifdef CONFIG_BLK_DEV_INITRD
 435                 /* Skip zones before initrd and initrd itself */
 436                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
 437                         continue;
 438 #endif
 439                 if (start >= mapstart)
 440                         continue;
 441                 mapstart = max(reserved_end, start);
 442         }
 443
 444         /*
 445          * Reserve any memory between the start of RAM and PHYS_OFFSET
 446          */
 447         if (ramstart > PHYS_OFFSET)
 448                 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
 449                                   BOOT_MEM_RESERVED);
 450
 451         if (min_low_pfn >= max_low_pfn)
 452                 panic("Incorrect memory mapping !!!");
 453         if (min_low_pfn > ARCH_PFN_OFFSET) {
 454                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 455                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 456                         min_low_pfn - ARCH_PFN_OFFSET);
 457         } else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) {
 458                 pr_info("%lu free pages won't be used\n",
 459                         ARCH_PFN_OFFSET - min_low_pfn);
 460         }
 461         min_low_pfn = ARCH_PFN_OFFSET;
 462
 463         /*
 464          * Determine low and high memory ranges
 465          */
 466         max_pfn = max_low_pfn;
 467         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 468 #ifdef CONFIG_HIGHMEM
 469                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 470                 highend_pfn = max_low_pfn;
 471 #endif
 472                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 473         }
 474
 475 #ifdef CONFIG_BLK_DEV_INITRD
 476         /*
 477          * mapstart should be after initrd_end
 478          */
 479         if (initrd_end)
 480                 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
 481 #endif
 482
 483         /*
 484          * check that mapstart doesn't overlap with any of
 485          * memory regions that have been reserved through eg. DTB
 486          */
 487         bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
 488
 489         bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
 490                                                 bootmap_size);
 491         for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
 492                 unsigned long mapstart_addr;
 493
 494                 switch (boot_mem_map.map[i].type) {
 495                 case BOOT_MEM_RESERVED:
 496                         mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
 497                                                 boot_mem_map.map[i].size);
 498                         if (PHYS_PFN(mapstart_addr) < mapstart)
 499                                 break;
 500
 501                         bootmap_valid = memory_region_available(mapstart_addr,
 502                                                                 bootmap_size);
 503                         if (bootmap_valid)
 504                                 mapstart = PHYS_PFN(mapstart_addr);
 505                         break;
 506                 default:
 507                         break;
 508                 }
 509         }
 510
 511         if (!bootmap_valid)
 512                 panic("No memory area to place a bootmap bitmap");
 513
 514         /*
 515          * Initialize the boot-time allocator with low memory only.
 516          */
 517         if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
 518                                          min_low_pfn, max_low_pfn))
 519                 panic("Unexpected memory size required for bootmap");
 520
 521         for (i = 0; i < boot_mem_map.nr_map; i++) {
 522                 unsigned long start, end;
 523
 524                 start = PFN_UP(boot_mem_map.map[i].addr);
 525                 end = PFN_DOWN(boot_mem_map.map[i].addr
 526                                 + boot_mem_map.map[i].size);
 527
 528                 if (start <= min_low_pfn)
 529                         start = min_low_pfn;
 530                 if (start >= end)
 531                         continue;
 532
 533 #ifndef CONFIG_HIGHMEM
 534                 if (end > max_low_pfn)
 535                         end = max_low_pfn;
 536
 537                 /*
 538                  * ... finally, is the area going away?
 539                  */
 540                 if (end <= start)
 541                         continue;
 542 #endif
 543
 544                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 545         }
 546
 547         /*
 548          * Register fully available low RAM pages with the bootmem allocator.
 549          */
 550         for (i = 0; i < boot_mem_map.nr_map; i++) {
 551                 unsigned long start, end, size;
 552
 553                 start = PFN_UP(boot_mem_map.map[i].addr);
 554                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 555                                     + boot_mem_map.map[i].size);
 556
 557                 /*
 558                  * Reserve usable memory.
 559                  */
 560                 switch (boot_mem_map.map[i].type) {
 561                 case BOOT_MEM_RAM:
 562                         break;
 563                 case BOOT_MEM_INIT_RAM:
 564                         memory_present(0, start, end);
 565                         continue;
 566                 default:
 567                         /* Not usable memory */
 568                         if (start > min_low_pfn && end < max_low_pfn)
 569                                 reserve_bootmem(boot_mem_map.map[i].addr,
 570                                                 boot_mem_map.map[i].size,
 571                                                 BOOTMEM_DEFAULT);
 572                         continue;
 573                 }
 574
 575                 /*
 576                  * We are rounding up the start address of usable memory
 577                  * and at the end of the usable range downwards.
 578                  */
 579                 if (start >= max_low_pfn)
 580                         continue;
 581                 if (start < reserved_end)
 582                         start = reserved_end;
 583                 if (end > max_low_pfn)
 584                         end = max_low_pfn;
 585
 586                 /*
 587                  * ... finally, is the area going away?
 588                  */
 589                 if (end <= start)
 590                         continue;
 591                 size = end - start;
 592
 593                 /* Register lowmem ranges */
 594                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 595                 memory_present(0, start, end);
 596         }
 597
 598         /*
 599          * Reserve the bootmap memory.
 600          */
 601         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 602
 603 #ifdef CONFIG_RELOCATABLE
 604         /*
 605          * The kernel reserves all memory below its _end symbol as bootmem,
 606          * but the kernel may now be at a much higher address. The memory
 607          * between the original and new locations may be returned to the system.
 608          */
 609         if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
 610                 unsigned long offset;
 611                 extern void show_kernel_relocation(const char *level);
 612
 613                 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
 614                 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
 615
 616 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
 617                 /*
 618                  * This information is necessary when debugging the kernel
 619                  * But is a security vulnerability otherwise!
 620                  */
 621                 show_kernel_relocation(KERN_INFO);
 622 #endif
 623         }
 624 #endif
 625
 626         /*
 627          * Reserve initrd memory if needed.
 628          */
 629         finalize_initrd();
 630 }
 631
 632 #endif  /* CONFIG_SGI_IP27 */
 633
 634 /*
 635  * arch_mem_init - initialize memory management subsystem
 636  *
 637  *  o plat_mem_setup() detects the memory configuration and will record detected
 638  *    memory areas using add_memory_region.
 639  *
 640  * At this stage the memory configuration of the system is known to the
 641  * kernel but generic memory management system is still entirely uninitialized.
 642  *
 643  *  o bootmem_init()
 644  *  o sparse_init()
 645  *  o paging_init()
 646  *  o dma_contiguous_reserve()
 647  *
 648  * At this stage the bootmem allocator is ready to use.
 649  *
 650  * NOTE: historically plat_mem_setup did the entire platform initialization.
 651  *       This was rather impractical because it meant plat_mem_setup had to
 652  * get away without any kind of memory allocator.  To keep old code from
 653  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 654  * initialization hook for anything else was introduced.
 655  */
 656
 657 static int usermem __initdata;
 658
 659 static int __init early_parse_mem(char *p)
 660 {
 661         phys_addr_t start, size;
 662
 663         /*
 664          * If a user specifies memory size, we
 665          * blow away any automatically generated
 666          * size.
 667          */
 668         if (usermem == 0) {
 669                 boot_mem_map.nr_map = 0;
 670                 usermem = 1;
 671         }
 672         start = 0;
 673         size = memparse(p, &p);
 674         if (*p == '@')
 675                 start = memparse(p + 1, &p);
 676
 677         add_memory_region(start, size, BOOT_MEM_RAM);
 678
 679         return 0;
 680 }
 681 early_param("mem", early_parse_mem);
 682
 683 static int __init early_parse_memmap(char *p)
 684 {
 685         char *oldp;
 686         u64 start_at, mem_size;
 687
 688         if (!p)
 689                 return -EINVAL;
 690
 691         if (!strncmp(p, "exactmap", 8)) {
 692                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 693                 return 0;
 694         }
 695
 696         oldp = p;
 697         mem_size = memparse(p, &p);
 698         if (p == oldp)
 699                 return -EINVAL;
 700
 701         if (*p == '@') {
 702                 start_at = memparse(p+1, &p);
 703                 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 704         } else if (*p == '#') {
 705                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 706                 return -EINVAL;
 707         } else if (*p == '$') {
 708                 start_at = memparse(p+1, &p);
 709                 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
 710         } else {
 711                 pr_err("\"memmap\" invalid format!\n");
 712                 return -EINVAL;
 713         }
 714
 715         if (*p == '\0') {
 716                 usermem = 1;
 717                 return 0;
 718         } else
 719                 return -EINVAL;
 720 }
 721 early_param("memmap", early_parse_memmap);
 722
 723 #ifdef CONFIG_PROC_VMCORE
 724 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 725 static int __init early_parse_elfcorehdr(char *p)
 726 {
 727         int i;
 728
 729         setup_elfcorehdr = memparse(p, &p);
 730
 731         for (i = 0; i < boot_mem_map.nr_map; i++) {
 732                 unsigned long start = boot_mem_map.map[i].addr;
 733                 unsigned long end = (boot_mem_map.map[i].addr +
 734                                      boot_mem_map.map[i].size);
 735                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 736                         /*
 737                          * Reserve from the elf core header to the end of
 738                          * the memory segment, that should all be kdump
 739                          * reserved memory.
 740                          */
 741                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 742                         break;
 743                 }
 744         }
 745         /*
 746          * If we don't find it in the memory map, then we shouldn't
 747          * have to worry about it, as the new kernel won't use it.
 748          */
 749         return 0;
 750 }
 751 early_param("elfcorehdr", early_parse_elfcorehdr);
 752 #endif
 753
 754 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
 755 {
 756         phys_addr_t size;
 757         int i;
 758
 759         size = end - mem;
 760         if (!size)
 761                 return;
 762
 763         /* Make sure it is in the boot_mem_map */
 764         for (i = 0; i < boot_mem_map.nr_map; i++) {
 765                 if (mem >= boot_mem_map.map[i].addr &&
 766                     mem < (boot_mem_map.map[i].addr +
 767                            boot_mem_map.map[i].size))
 768                         return;
 769         }
 770         add_memory_region(mem, size, type);
 771 }
 772
 773 #ifdef CONFIG_KEXEC
 774 static inline unsigned long long get_total_mem(void)
 775 {
 776         unsigned long long total;
 777
 778         total = max_pfn - min_low_pfn;
 779         return total << PAGE_SHIFT;
 780 }
 781
 782 static void __init mips_parse_crashkernel(void)
 783 {
 784         unsigned long long total_mem;
 785         unsigned long long crash_size, crash_base;
 786         int ret;
 787
 788         total_mem = get_total_mem();
 789         ret = parse_crashkernel(boot_command_line, total_mem,
 790                                 &crash_size, &crash_base);
 791         if (ret != 0 || crash_size <= 0)
 792                 return;
 793
 794         if (!memory_region_available(crash_base, crash_size)) {
 795                 pr_warn("Invalid memory region reserved for crash kernel\n");
 796                 return;
 797         }
 798
 799         crashk_res.start = crash_base;
 800         crashk_res.end   = crash_base + crash_size - 1;
 801 }
 802
 803 static void __init request_crashkernel(struct resource *res)
 804 {
 805         int ret;
 806
 807         if (crashk_res.start == crashk_res.end)
 808                 return;
 809
 810         ret = request_resource(res, &crashk_res);
 811         if (!ret)
 812                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 813                         (unsigned long)((crashk_res.end -
 814                                          crashk_res.start + 1) >> 20),
 815                         (unsigned long)(crashk_res.start  >> 20));
 816 }
 817 #else /* !defined(CONFIG_KEXEC)         */
 818 static void __init mips_parse_crashkernel(void)
 819 {
 820 }
 821
 822 static void __init request_crashkernel(struct resource *res)
 823 {
 824 }
 825 #endif /* !defined(CONFIG_KEXEC)  */
 826
 827 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
 828 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
 829 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
 830 #define BUILTIN_EXTEND_WITH_PROM        \
 831         IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
 832
 833 static void __init arch_mem_init(char **cmdline_p)
 834 {
 835         struct memblock_region *reg;
 836         extern void plat_mem_setup(void);
 837
 838 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
 839         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 840 #else
 841         if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
 842             (USE_DTB_CMDLINE && !boot_command_line[0]))
 843                 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 844
 845         if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
 846                 if (boot_command_line[0])
 847                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 848                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 849         }
 850
 851 #if defined(CONFIG_CMDLINE_BOOL)
 852         if (builtin_cmdline[0]) {
 853                 if (boot_command_line[0])
 854                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 855                 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 856         }
 857
 858         if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
 859                 if (boot_command_line[0])
 860                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 861                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 862         }
 863 #endif
 864 #endif
 865
 866         /* call board setup routine */
 867         plat_mem_setup();
 868
 869         /*
 870          * Make sure all kernel memory is in the maps.  The "UP" and
 871          * "DOWN" are opposite for initdata since if it crosses over
 872          * into another memory section you don't want that to be
 873          * freed when the initdata is freed.
 874          */
 875         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
 876                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
 877                          BOOT_MEM_RAM);
 878         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
 879                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
 880                          BOOT_MEM_INIT_RAM);
 881
 882         pr_info("Determined physical RAM map:\n");
 883         print_memory_map();
 884
 885         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 886
 887         *cmdline_p = command_line;
 888
 889         parse_early_param();
 890
 891         if (usermem) {
 892                 pr_info("User-defined physical RAM map:\n");
 893                 print_memory_map();
 894         }
 895
 896         early_init_fdt_reserve_self();
 897         early_init_fdt_scan_reserved_mem();
 898
 899         bootmem_init();
 900 #ifdef CONFIG_PROC_VMCORE
 901         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 902                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 903                        setup_elfcorehdr, setup_elfcorehdr_size);
 904                 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
 905                                 BOOTMEM_DEFAULT);
 906         }
 907 #endif
 908
 909         mips_parse_crashkernel();
 910 #ifdef CONFIG_KEXEC
 911         if (crashk_res.start != crashk_res.end)
 912                 reserve_bootmem(crashk_res.start,
 913                                 crashk_res.end - crashk_res.start + 1,
 914                                 BOOTMEM_DEFAULT);
 915 #endif
 916         device_tree_init();
 917         sparse_init();
 918         plat_swiotlb_setup();
 919
 920         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 921         /* Tell bootmem about cma reserved memblock section */
 922         for_each_memblock(reserved, reg)
 923                 if (reg->size != 0)
 924                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 925
 926         reserve_bootmem_region(__pa_symbol(&__nosave_begin),
 927                         __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
 928 }
 929
 930 static void __init resource_init(void)
 931 {
 932         int i;
 933
 934         if (UNCAC_BASE != IO_BASE)
 935                 return;
 936
 937         code_resource.start = __pa_symbol(&_text);
 938         code_resource.end = __pa_symbol(&_etext) - 1;
 939         data_resource.start = __pa_symbol(&_etext);
 940         data_resource.end = __pa_symbol(&_edata) - 1;
 941         bss_resource.start = __pa_symbol(&__bss_start);
 942         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 943
 944         for (i = 0; i < boot_mem_map.nr_map; i++) {
 945                 struct resource *res;
 946                 unsigned long start, end;
 947
 948                 start = boot_mem_map.map[i].addr;
 949                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 950                 if (start >= HIGHMEM_START)
 951                         continue;
 952                 if (end >= HIGHMEM_START)
 953                         end = HIGHMEM_START - 1;
 954
 955                 res = alloc_bootmem(sizeof(struct resource));
 956
 957                 res->start = start;
 958                 res->end = end;
 959                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 960
 961                 switch (boot_mem_map.map[i].type) {
 962                 case BOOT_MEM_RAM:
 963                 case BOOT_MEM_INIT_RAM:
 964                 case BOOT_MEM_ROM_DATA:
 965                         res->name = "System RAM";
 966                         res->flags |= IORESOURCE_SYSRAM;
 967                         break;
 968                 case BOOT_MEM_RESERVED:
 969                 default:
 970                         res->name = "reserved";
 971                 }
 972
 973                 request_resource(&iomem_resource, res);
 974
 975                 /*
 976                  *  We don't know which RAM region contains kernel data,
 977                  *  so we try it repeatedly and let the resource manager
 978                  *  test it.
 979                  */
 980                 request_resource(res, &code_resource);
 981                 request_resource(res, &data_resource);
 982                 request_resource(res, &bss_resource);
 983                 request_crashkernel(res);
 984         }
 985 }
 986
 987 #ifdef CONFIG_SMP
 988 static void __init prefill_possible_map(void)
 989 {
 990         int i, possible = num_possible_cpus();
 991
 992         if (possible > nr_cpu_ids)
 993                 possible = nr_cpu_ids;
 994
 995         for (i = 0; i < possible; i++)
 996                 set_cpu_possible(i, true);
 997         for (; i < NR_CPUS; i++)
 998                 set_cpu_possible(i, false);
 999
1000         nr_cpu_ids = possible;
1001 }
1002 #else
1003 static inline void prefill_possible_map(void) {}
1004 #endif
1005
1006 void __init setup_arch(char **cmdline_p)
1007 {
1008         cpu_probe();
1009         mips_cm_probe();
1010         prom_init();
1011
1012         setup_early_fdc_console();
1013 #ifdef CONFIG_EARLY_PRINTK
1014         setup_early_printk();
1015 #endif
1016         cpu_report();
1017         check_bugs_early();
1018
1019 #if defined(CONFIG_VT)
1020 #if defined(CONFIG_VGA_CONSOLE)
1021         conswitchp = &vga_con;
1022 #elif defined(CONFIG_DUMMY_CONSOLE)
1023         conswitchp = &dummy_con;
1024 #endif
1025 #endif
1026
1027         arch_mem_init(cmdline_p);
1028
1029         resource_init();
1030         plat_smp_setup();
1031         prefill_possible_map();
1032
1033         cpu_cache_init();
1034         paging_init();
1035 }
1036
1037 unsigned long kernelsp[NR_CPUS];
1038 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
1039
1040 #ifdef CONFIG_USE_OF
1041 unsigned long fw_passed_dtb;
1042 #endif
1043
1044 #ifdef CONFIG_DEBUG_FS
1045 struct dentry *mips_debugfs_dir;
1046 static int __init debugfs_mips(void)
1047 {
1048         struct dentry *d;
1049
1050         d = debugfs_create_dir("mips", NULL);
1051         if (!d)
1052                 return -ENOMEM;
1053         mips_debugfs_dir = d;
1054         return 0;
1055 }
1056 arch_initcall(debugfs_mips);
1057 #endif