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