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
  31 #include <asm/addrspace.h>
  32 #include <asm/bootinfo.h>
  33 #include <asm/bugs.h>
  34 #include <asm/cache.h>
  35 #include <asm/cdmm.h>
  36 #include <asm/cpu.h>
  37 #include <asm/debug.h>
  38 #include <asm/sections.h>
  39 #include <asm/setup.h>
  40 #include <asm/smp-ops.h>
  41 #include <asm/prom.h>
  42
  43 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  44 const char __section(.appended_dtb) __appended_dtb[0x100000];
  45 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  46
  47 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  48
  49 EXPORT_SYMBOL(cpu_data);
  50
  51 #ifdef CONFIG_VT
  52 struct screen_info screen_info;
  53 #endif
  54
  55 /*
  56  * Setup information
  57  *
  58  * These are initialized so they are in the .data section
  59  */
  60 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  61
  62 EXPORT_SYMBOL(mips_machtype);
  63
  64 struct boot_mem_map boot_mem_map;
  65
  66 static char __initdata command_line[COMMAND_LINE_SIZE];
  67 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  68
  69 #ifdef CONFIG_CMDLINE_BOOL
  70 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  71 #endif
  72
  73 /*
  74  * mips_io_port_base is the begin of the address space to which x86 style
  75  * I/O ports are mapped.
  76  */
  77 const unsigned long mips_io_port_base = -1;
  78 EXPORT_SYMBOL(mips_io_port_base);
  79
  80 static struct resource code_resource = { .name = "Kernel code", };
  81 static struct resource data_resource = { .name = "Kernel data", };
  82
  83 static void *detect_magic __initdata = detect_memory_region;
  84
  85 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
  86 {
  87         int x = boot_mem_map.nr_map;
  88         int i;
  89
  90         /* Sanity check */
  91         if (start + size < start) {
  92                 pr_warn("Trying to add an invalid memory region, skipped\n");
  93                 return;
  94         }
  95
  96         /*
  97          * Try to merge with existing entry, if any.
  98          */
  99         for (i = 0; i < boot_mem_map.nr_map; i++) {
 100                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
 101                 unsigned long top;
 102
 103                 if (entry->type != type)
 104                         continue;
 105
 106                 if (start + size < entry->addr)
 107                         continue;                       /* no overlap */
 108
 109                 if (entry->addr + entry->size < start)
 110                         continue;                       /* no overlap */
 111
 112                 top = max(entry->addr + entry->size, start + size);
 113                 entry->addr = min(entry->addr, start);
 114                 entry->size = top - entry->addr;
 115
 116                 return;
 117         }
 118
 119         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 120                 pr_err("Ooops! Too many entries in the memory map!\n");
 121                 return;
 122         }
 123
 124         boot_mem_map.map[x].addr = start;
 125         boot_mem_map.map[x].size = size;
 126         boot_mem_map.map[x].type = type;
 127         boot_mem_map.nr_map++;
 128 }
 129
 130 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
 131 {
 132         void *dm = &detect_magic;
 133         phys_addr_t size;
 134
 135         for (size = sz_min; size < sz_max; size <<= 1) {
 136                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 137                         break;
 138         }
 139
 140         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 141                 ((unsigned long long) size) / SZ_1M,
 142                 (unsigned long long) start,
 143                 ((unsigned long long) sz_min) / SZ_1M,
 144                 ((unsigned long long) sz_max) / SZ_1M);
 145
 146         add_memory_region(start, size, BOOT_MEM_RAM);
 147 }
 148
 149 static void __init print_memory_map(void)
 150 {
 151         int i;
 152         const int field = 2 * sizeof(unsigned long);
 153
 154         for (i = 0; i < boot_mem_map.nr_map; i++) {
 155                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 156                        field, (unsigned long long) boot_mem_map.map[i].size,
 157                        field, (unsigned long long) boot_mem_map.map[i].addr);
 158
 159                 switch (boot_mem_map.map[i].type) {
 160                 case BOOT_MEM_RAM:
 161                         printk(KERN_CONT "(usable)\n");
 162                         break;
 163                 case BOOT_MEM_INIT_RAM:
 164                         printk(KERN_CONT "(usable after init)\n");
 165                         break;
 166                 case BOOT_MEM_ROM_DATA:
 167                         printk(KERN_CONT "(ROM data)\n");
 168                         break;
 169                 case BOOT_MEM_RESERVED:
 170                         printk(KERN_CONT "(reserved)\n");
 171                         break;
 172                 default:
 173                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 174                         break;
 175                 }
 176         }
 177 }
 178
 179 /*
 180  * Manage initrd
 181  */
 182 #ifdef CONFIG_BLK_DEV_INITRD
 183
 184 static int __init rd_start_early(char *p)
 185 {
 186         unsigned long start = memparse(p, &p);
 187
 188 #ifdef CONFIG_64BIT
 189         /* Guess if the sign extension was forgotten by bootloader */
 190         if (start < XKPHYS)
 191                 start = (int)start;
 192 #endif
 193         initrd_start = start;
 194         initrd_end += start;
 195         return 0;
 196 }
 197 early_param("rd_start", rd_start_early);
 198
 199 static int __init rd_size_early(char *p)
 200 {
 201         initrd_end += memparse(p, &p);
 202         return 0;
 203 }
 204 early_param("rd_size", rd_size_early);
 205
 206 /* it returns the next free pfn after initrd */
 207 static unsigned long __init init_initrd(void)
 208 {
 209         unsigned long end;
 210
 211         /*
 212          * Board specific code or command line parser should have
 213          * already set up initrd_start and initrd_end. In these cases
 214          * perfom sanity checks and use them if all looks good.
 215          */
 216         if (!initrd_start || initrd_end <= initrd_start)
 217                 goto disable;
 218
 219         if (initrd_start & ~PAGE_MASK) {
 220                 pr_err("initrd start must be page aligned\n");
 221                 goto disable;
 222         }
 223         if (initrd_start < PAGE_OFFSET) {
 224                 pr_err("initrd start < PAGE_OFFSET\n");
 225                 goto disable;
 226         }
 227
 228         /*
 229          * Sanitize initrd addresses. For example firmware
 230          * can't guess if they need to pass them through
 231          * 64-bits values if the kernel has been built in pure
 232          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 233          * addresses now, so the code can now safely use __pa().
 234          */
 235         end = __pa(initrd_end);
 236         initrd_end = (unsigned long)__va(end);
 237         initrd_start = (unsigned long)__va(__pa(initrd_start));
 238
 239         ROOT_DEV = Root_RAM0;
 240         return PFN_UP(end);
 241 disable:
 242         initrd_start = 0;
 243         initrd_end = 0;
 244         return 0;
 245 }
 246
 247 /* In some conditions (e.g. big endian bootloader with a little endian
 248    kernel), the initrd might appear byte swapped.  Try to detect this and
 249    byte swap it if needed.  */
 250 static void __init maybe_bswap_initrd(void)
 251 {
 252 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 253         u64 buf;
 254
 255         /* Check for CPIO signature */
 256         if (!memcmp((void *)initrd_start, "070701", 6))
 257                 return;
 258
 259         /* Check for compressed initrd */
 260         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 261                 return;
 262
 263         /* Try again with a byte swapped header */
 264         buf = swab64p((u64 *)initrd_start);
 265         if (!memcmp(&buf, "070701", 6) ||
 266             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 267                 unsigned long i;
 268
 269                 pr_info("Byteswapped initrd detected\n");
 270                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 271                         swab64s((u64 *)i);
 272         }
 273 #endif
 274 }
 275
 276 static void __init finalize_initrd(void)
 277 {
 278         unsigned long size = initrd_end - initrd_start;
 279
 280         if (size == 0) {
 281                 printk(KERN_INFO "Initrd not found or empty");
 282                 goto disable;
 283         }
 284         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 285                 printk(KERN_ERR "Initrd extends beyond end of memory");
 286                 goto disable;
 287         }
 288
 289         maybe_bswap_initrd();
 290
 291         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 292         initrd_below_start_ok = 1;
 293
 294         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 295                 initrd_start, size);
 296         return;
 297 disable:
 298         printk(KERN_CONT " - disabling initrd\n");
 299         initrd_start = 0;
 300         initrd_end = 0;
 301 }
 302
 303 #else  /* !CONFIG_BLK_DEV_INITRD */
 304
 305 static unsigned long __init init_initrd(void)
 306 {
 307         return 0;
 308 }
 309
 310 #define finalize_initrd()       do {} while (0)
 311
 312 #endif
 313
 314 /*
 315  * Initialize the bootmem allocator. It also setup initrd related data
 316  * if needed.
 317  */
 318 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
 319
 320 static void __init bootmem_init(void)
 321 {
 322         init_initrd();
 323         finalize_initrd();
 324 }
 325
 326 #else  /* !CONFIG_SGI_IP27 */
 327
 328 static void __init bootmem_init(void)
 329 {
 330         unsigned long reserved_end;
 331         unsigned long mapstart = ~0UL;
 332         unsigned long bootmap_size;
 333         int i;
 334
 335         /*
 336          * Sanity check any INITRD first. We don't take it into account
 337          * for bootmem setup initially, rely on the end-of-kernel-code
 338          * as our memory range starting point. Once bootmem is inited we
 339          * will reserve the area used for the initrd.
 340          */
 341         init_initrd();
 342         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 343
 344         /*
 345          * max_low_pfn is not a number of pages. The number of pages
 346          * of the system is given by 'max_low_pfn - min_low_pfn'.
 347          */
 348         min_low_pfn = ~0UL;
 349         max_low_pfn = 0;
 350
 351         /*
 352          * Find the highest page frame number we have available.
 353          */
 354         for (i = 0; i < boot_mem_map.nr_map; i++) {
 355                 unsigned long start, end;
 356
 357                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 358                         continue;
 359
 360                 start = PFN_UP(boot_mem_map.map[i].addr);
 361                 end = PFN_DOWN(boot_mem_map.map[i].addr
 362                                 + boot_mem_map.map[i].size);
 363
 364                 if (end > max_low_pfn)
 365                         max_low_pfn = end;
 366                 if (start < min_low_pfn)
 367                         min_low_pfn = start;
 368                 if (end <= reserved_end)
 369                         continue;
 370 #ifdef CONFIG_BLK_DEV_INITRD
 371                 /* Skip zones before initrd and initrd itself */
 372                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
 373                         continue;
 374 #endif
 375                 if (start >= mapstart)
 376                         continue;
 377                 mapstart = max(reserved_end, start);
 378         }
 379
 380         if (min_low_pfn >= max_low_pfn)
 381                 panic("Incorrect memory mapping !!!");
 382         if (min_low_pfn > ARCH_PFN_OFFSET) {
 383                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 384                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 385                         min_low_pfn - ARCH_PFN_OFFSET);
 386         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 387                 pr_info("%lu free pages won't be used\n",
 388                         ARCH_PFN_OFFSET - min_low_pfn);
 389         }
 390         min_low_pfn = ARCH_PFN_OFFSET;
 391
 392         /*
 393          * Determine low and high memory ranges
 394          */
 395         max_pfn = max_low_pfn;
 396         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 397 #ifdef CONFIG_HIGHMEM
 398                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 399                 highend_pfn = max_low_pfn;
 400 #endif
 401                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 402         }
 403
 404 #ifdef CONFIG_BLK_DEV_INITRD
 405         /*
 406          * mapstart should be after initrd_end
 407          */
 408         if (initrd_end)
 409                 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
 410 #endif
 411
 412         /*
 413          * Initialize the boot-time allocator with low memory only.
 414          */
 415         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 416                                          min_low_pfn, max_low_pfn);
 417
 418
 419         for (i = 0; i < boot_mem_map.nr_map; i++) {
 420                 unsigned long start, end;
 421
 422                 start = PFN_UP(boot_mem_map.map[i].addr);
 423                 end = PFN_DOWN(boot_mem_map.map[i].addr
 424                                 + boot_mem_map.map[i].size);
 425
 426                 if (start <= min_low_pfn)
 427                         start = min_low_pfn;
 428                 if (start >= end)
 429                         continue;
 430
 431 #ifndef CONFIG_HIGHMEM
 432                 if (end > max_low_pfn)
 433                         end = max_low_pfn;
 434
 435                 /*
 436                  * ... finally, is the area going away?
 437                  */
 438                 if (end <= start)
 439                         continue;
 440 #endif
 441
 442                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 443         }
 444
 445         /*
 446          * Register fully available low RAM pages with the bootmem allocator.
 447          */
 448         for (i = 0; i < boot_mem_map.nr_map; i++) {
 449                 unsigned long start, end, size;
 450
 451                 start = PFN_UP(boot_mem_map.map[i].addr);
 452                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 453                                     + boot_mem_map.map[i].size);
 454
 455                 /*
 456                  * Reserve usable memory.
 457                  */
 458                 switch (boot_mem_map.map[i].type) {
 459                 case BOOT_MEM_RAM:
 460                         break;
 461                 case BOOT_MEM_INIT_RAM:
 462                         memory_present(0, start, end);
 463                         continue;
 464                 default:
 465                         /* Not usable memory */
 466                         continue;
 467                 }
 468
 469                 /*
 470                  * We are rounding up the start address of usable memory
 471                  * and at the end of the usable range downwards.
 472                  */
 473                 if (start >= max_low_pfn)
 474                         continue;
 475                 if (start < reserved_end)
 476                         start = reserved_end;
 477                 if (end > max_low_pfn)
 478                         end = max_low_pfn;
 479
 480                 /*
 481                  * ... finally, is the area going away?
 482                  */
 483                 if (end <= start)
 484                         continue;
 485                 size = end - start;
 486
 487                 /* Register lowmem ranges */
 488                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 489                 memory_present(0, start, end);
 490         }
 491
 492         /*
 493          * Reserve the bootmap memory.
 494          */
 495         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 496
 497 #ifdef CONFIG_RELOCATABLE
 498         /*
 499          * The kernel reserves all memory below its _end symbol as bootmem,
 500          * but the kernel may now be at a much higher address. The memory
 501          * between the original and new locations may be returned to the system.
 502          */
 503         if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
 504                 unsigned long offset;
 505                 extern void show_kernel_relocation(const char *level);
 506
 507                 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
 508                 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
 509
 510 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
 511                 /*
 512                  * This information is necessary when debugging the kernel
 513                  * But is a security vulnerability otherwise!
 514                  */
 515                 show_kernel_relocation(KERN_INFO);
 516 #endif
 517         }
 518 #endif
 519
 520         /*
 521          * Reserve initrd memory if needed.
 522          */
 523         finalize_initrd();
 524 }
 525
 526 #endif  /* CONFIG_SGI_IP27 */
 527
 528 /*
 529  * arch_mem_init - initialize memory management subsystem
 530  *
 531  *  o plat_mem_setup() detects the memory configuration and will record detected
 532  *    memory areas using add_memory_region.
 533  *
 534  * At this stage the memory configuration of the system is known to the
 535  * kernel but generic memory management system is still entirely uninitialized.
 536  *
 537  *  o bootmem_init()
 538  *  o sparse_init()
 539  *  o paging_init()
 540  *  o dma_contiguous_reserve()
 541  *
 542  * At this stage the bootmem allocator is ready to use.
 543  *
 544  * NOTE: historically plat_mem_setup did the entire platform initialization.
 545  *       This was rather impractical because it meant plat_mem_setup had to
 546  * get away without any kind of memory allocator.  To keep old code from
 547  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 548  * initialization hook for anything else was introduced.
 549  */
 550
 551 static int usermem __initdata;
 552
 553 static int __init early_parse_mem(char *p)
 554 {
 555         phys_addr_t start, size;
 556
 557         /*
 558          * If a user specifies memory size, we
 559          * blow away any automatically generated
 560          * size.
 561          */
 562         if (usermem == 0) {
 563                 boot_mem_map.nr_map = 0;
 564                 usermem = 1;
 565         }
 566         start = 0;
 567         size = memparse(p, &p);
 568         if (*p == '@')
 569                 start = memparse(p + 1, &p);
 570
 571         add_memory_region(start, size, BOOT_MEM_RAM);
 572         return 0;
 573 }
 574 early_param("mem", early_parse_mem);
 575
 576 #ifdef CONFIG_PROC_VMCORE
 577 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 578 static int __init early_parse_elfcorehdr(char *p)
 579 {
 580         int i;
 581
 582         setup_elfcorehdr = memparse(p, &p);
 583
 584         for (i = 0; i < boot_mem_map.nr_map; i++) {
 585                 unsigned long start = boot_mem_map.map[i].addr;
 586                 unsigned long end = (boot_mem_map.map[i].addr +
 587                                      boot_mem_map.map[i].size);
 588                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 589                         /*
 590                          * Reserve from the elf core header to the end of
 591                          * the memory segment, that should all be kdump
 592                          * reserved memory.
 593                          */
 594                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 595                         break;
 596                 }
 597         }
 598         /*
 599          * If we don't find it in the memory map, then we shouldn't
 600          * have to worry about it, as the new kernel won't use it.
 601          */
 602         return 0;
 603 }
 604 early_param("elfcorehdr", early_parse_elfcorehdr);
 605 #endif
 606
 607 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
 608 {
 609         phys_addr_t size;
 610         int i;
 611
 612         size = end - mem;
 613         if (!size)
 614                 return;
 615
 616         /* Make sure it is in the boot_mem_map */
 617         for (i = 0; i < boot_mem_map.nr_map; i++) {
 618                 if (mem >= boot_mem_map.map[i].addr &&
 619                     mem < (boot_mem_map.map[i].addr +
 620                            boot_mem_map.map[i].size))
 621                         return;
 622         }
 623         add_memory_region(mem, size, type);
 624 }
 625
 626 #ifdef CONFIG_KEXEC
 627 static inline unsigned long long get_total_mem(void)
 628 {
 629         unsigned long long total;
 630
 631         total = max_pfn - min_low_pfn;
 632         return total << PAGE_SHIFT;
 633 }
 634
 635 static void __init mips_parse_crashkernel(void)
 636 {
 637         unsigned long long total_mem;
 638         unsigned long long crash_size, crash_base;
 639         int ret;
 640
 641         total_mem = get_total_mem();
 642         ret = parse_crashkernel(boot_command_line, total_mem,
 643                                 &crash_size, &crash_base);
 644         if (ret != 0 || crash_size <= 0)
 645                 return;
 646
 647         crashk_res.start = crash_base;
 648         crashk_res.end   = crash_base + crash_size - 1;
 649 }
 650
 651 static void __init request_crashkernel(struct resource *res)
 652 {
 653         int ret;
 654
 655         ret = request_resource(res, &crashk_res);
 656         if (!ret)
 657                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 658                         (unsigned long)((crashk_res.end -
 659                                          crashk_res.start + 1) >> 20),
 660                         (unsigned long)(crashk_res.start  >> 20));
 661 }
 662 #else /* !defined(CONFIG_KEXEC)         */
 663 static void __init mips_parse_crashkernel(void)
 664 {
 665 }
 666
 667 static void __init request_crashkernel(struct resource *res)
 668 {
 669 }
 670 #endif /* !defined(CONFIG_KEXEC)  */
 671
 672 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
 673 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
 674 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
 675 #define BUILTIN_EXTEND_WITH_PROM        \
 676         IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
 677
 678 static void __init arch_mem_init(char **cmdline_p)
 679 {
 680         struct memblock_region *reg;
 681         extern void plat_mem_setup(void);
 682
 683         /* call board setup routine */
 684         plat_mem_setup();
 685
 686         /*
 687          * Make sure all kernel memory is in the maps.  The "UP" and
 688          * "DOWN" are opposite for initdata since if it crosses over
 689          * into another memory section you don't want that to be
 690          * freed when the initdata is freed.
 691          */
 692         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
 693                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
 694                          BOOT_MEM_RAM);
 695         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
 696                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
 697                          BOOT_MEM_INIT_RAM);
 698
 699         pr_info("Determined physical RAM map:\n");
 700         print_memory_map();
 701
 702 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
 703         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 704 #else
 705         if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
 706             (USE_DTB_CMDLINE && !boot_command_line[0]))
 707                 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 708
 709         if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
 710                 if (boot_command_line[0])
 711                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 712                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 713         }
 714
 715 #if defined(CONFIG_CMDLINE_BOOL)
 716         if (builtin_cmdline[0]) {
 717                 if (boot_command_line[0])
 718                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 719                 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 720         }
 721
 722         if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
 723                 if (boot_command_line[0])
 724                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 725                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 726         }
 727 #endif
 728 #endif
 729         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 730
 731         *cmdline_p = command_line;
 732
 733         parse_early_param();
 734
 735         if (usermem) {
 736                 pr_info("User-defined physical RAM map:\n");
 737                 print_memory_map();
 738         }
 739
 740         bootmem_init();
 741 #ifdef CONFIG_PROC_VMCORE
 742         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 743                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 744                        setup_elfcorehdr, setup_elfcorehdr_size);
 745                 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
 746                                 BOOTMEM_DEFAULT);
 747         }
 748 #endif
 749
 750         mips_parse_crashkernel();
 751 #ifdef CONFIG_KEXEC
 752         if (crashk_res.start != crashk_res.end)
 753                 reserve_bootmem(crashk_res.start,
 754                                 crashk_res.end - crashk_res.start + 1,
 755                                 BOOTMEM_DEFAULT);
 756 #endif
 757         device_tree_init();
 758         sparse_init();
 759         plat_swiotlb_setup();
 760         paging_init();
 761
 762         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 763         /* Tell bootmem about cma reserved memblock section */
 764         for_each_memblock(reserved, reg)
 765                 if (reg->size != 0)
 766                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 767
 768         reserve_bootmem_region(__pa_symbol(&__nosave_begin),
 769                         __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
 770 }
 771
 772 static void __init resource_init(void)
 773 {
 774         int i;
 775
 776         if (UNCAC_BASE != IO_BASE)
 777                 return;
 778
 779         code_resource.start = __pa_symbol(&_text);
 780         code_resource.end = __pa_symbol(&_etext) - 1;
 781         data_resource.start = __pa_symbol(&_etext);
 782         data_resource.end = __pa_symbol(&_edata) - 1;
 783
 784         for (i = 0; i < boot_mem_map.nr_map; i++) {
 785                 struct resource *res;
 786                 unsigned long start, end;
 787
 788                 start = boot_mem_map.map[i].addr;
 789                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 790                 if (start >= HIGHMEM_START)
 791                         continue;
 792                 if (end >= HIGHMEM_START)
 793                         end = HIGHMEM_START - 1;
 794
 795                 res = alloc_bootmem(sizeof(struct resource));
 796
 797                 res->start = start;
 798                 res->end = end;
 799                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 800
 801                 switch (boot_mem_map.map[i].type) {
 802                 case BOOT_MEM_RAM:
 803                 case BOOT_MEM_INIT_RAM:
 804                 case BOOT_MEM_ROM_DATA:
 805                         res->name = "System RAM";
 806                         res->flags |= IORESOURCE_SYSRAM;
 807                         break;
 808                 case BOOT_MEM_RESERVED:
 809                 default:
 810                         res->name = "reserved";
 811                 }
 812
 813                 request_resource(&iomem_resource, res);
 814
 815                 /*
 816                  *  We don't know which RAM region contains kernel data,
 817                  *  so we try it repeatedly and let the resource manager
 818                  *  test it.
 819                  */
 820                 request_resource(res, &code_resource);
 821                 request_resource(res, &data_resource);
 822                 request_crashkernel(res);
 823         }
 824 }
 825
 826 #ifdef CONFIG_SMP
 827 static void __init prefill_possible_map(void)
 828 {
 829         int i, possible = num_possible_cpus();
 830
 831         if (possible > nr_cpu_ids)
 832                 possible = nr_cpu_ids;
 833
 834         for (i = 0; i < possible; i++)
 835                 set_cpu_possible(i, true);
 836         for (; i < NR_CPUS; i++)
 837                 set_cpu_possible(i, false);
 838
 839         nr_cpu_ids = possible;
 840 }
 841 #else
 842 static inline void prefill_possible_map(void) {}
 843 #endif
 844
 845 void __init setup_arch(char **cmdline_p)
 846 {
 847         cpu_probe();
 848         mips_cm_probe();
 849         prom_init();
 850
 851         setup_early_fdc_console();
 852 #ifdef CONFIG_EARLY_PRINTK
 853         setup_early_printk();
 854 #endif
 855         cpu_report();
 856         check_bugs_early();
 857
 858 #if defined(CONFIG_VT)
 859 #if defined(CONFIG_VGA_CONSOLE)
 860         conswitchp = &vga_con;
 861 #elif defined(CONFIG_DUMMY_CONSOLE)
 862         conswitchp = &dummy_con;
 863 #endif
 864 #endif
 865
 866         arch_mem_init(cmdline_p);
 867
 868         resource_init();
 869         plat_smp_setup();
 870         prefill_possible_map();
 871
 872         cpu_cache_init();
 873 }
 874
 875 unsigned long kernelsp[NR_CPUS];
 876 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 877
 878 #ifdef CONFIG_USE_OF
 879 unsigned long fw_passed_dtb;
 880 #endif
 881
 882 #ifdef CONFIG_DEBUG_FS
 883 struct dentry *mips_debugfs_dir;
 884 static int __init debugfs_mips(void)
 885 {
 886         struct dentry *d;
 887
 888         d = debugfs_create_dir("mips", NULL);
 889         if (!d)
 890                 return -ENOMEM;
 891         mips_debugfs_dir = d;
 892         return 0;
 893 }
 894 arch_initcall(debugfs_mips);
 895 #endif