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/initrd.h>
  19 #include <linux/root_dev.h>
  20 #include <linux/highmem.h>
  21 #include <linux/console.h>
  22 #include <linux/pfn.h>
  23 #include <linux/debugfs.h>
  24 #include <linux/kexec.h>
  25 #include <linux/sizes.h>
  26 #include <linux/device.h>
  27 #include <linux/dma-contiguous.h>
  28 #include <linux/decompress/generic.h>
  29 #include <linux/of_fdt.h>
  30 #include <linux/of_reserved_mem.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/dma-coherence.h>
  40 #include <asm/sections.h>
  41 #include <asm/setup.h>
  42 #include <asm/smp-ops.h>
  43 #include <asm/prom.h>
  44
  45 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  46 const char __section(.appended_dtb) __appended_dtb[0x100000];
  47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  48
  49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  50
  51 EXPORT_SYMBOL(cpu_data);
  52
  53 #ifdef CONFIG_VT
  54 struct screen_info screen_info;
  55 #endif
  56
  57 /*
  58  * Setup information
  59  *
  60  * These are initialized so they are in the .data section
  61  */
  62 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  63
  64 EXPORT_SYMBOL(mips_machtype);
  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 const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
  71 #else
  72 static const char builtin_cmdline[] __initconst = "";
  73 #endif
  74
  75 /*
  76  * mips_io_port_base is the begin of the address space to which x86 style
  77  * I/O ports are mapped.
  78  */
  79 unsigned long mips_io_port_base = -1;
  80 EXPORT_SYMBOL(mips_io_port_base);
  81
  82 static struct resource code_resource = { .name = "Kernel code", };
  83 static struct resource data_resource = { .name = "Kernel data", };
  84 static struct resource bss_resource = { .name = "Kernel bss", };
  85
  86 static void *detect_magic __initdata = detect_memory_region;
  87
  88 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
  89 unsigned long ARCH_PFN_OFFSET;
  90 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
  91 #endif
  92
  93 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
  94 {
  95         /*
  96          * Note: This function only exists for historical reason,
  97          * new code should use memblock_add or memblock_add_node instead.
  98          */
  99
 100         /*
 101          * If the region reaches the top of the physical address space, adjust
 102          * the size slightly so that (start + size) doesn't overflow
 103          */
 104         if (start + size - 1 == PHYS_ADDR_MAX)
 105                 --size;
 106
 107         /* Sanity check */
 108         if (start + size < start) {
 109                 pr_warn("Trying to add an invalid memory region, skipped\n");
 110                 return;
 111         }
 112
 113         if (start < PHYS_OFFSET)
 114                 return;
 115
 116         memblock_add(start, size);
 117         /* Reserve any memory except the ordinary RAM ranges. */
 118         switch (type) {
 119         case BOOT_MEM_RAM:
 120                 break;
 121
 122         case BOOT_MEM_NOMAP: /* Discard the range from the system. */
 123                 memblock_remove(start, size);
 124                 break;
 125
 126         default: /* Reserve the rest of the memory types at boot time */
 127                 memblock_reserve(start, size);
 128                 break;
 129         }
 130 }
 131
 132 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
 133 {
 134         void *dm = &detect_magic;
 135         phys_addr_t size;
 136
 137         for (size = sz_min; size < sz_max; size <<= 1) {
 138                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 139                         break;
 140         }
 141
 142         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 143                 ((unsigned long long) size) / SZ_1M,
 144                 (unsigned long long) start,
 145                 ((unsigned long long) sz_min) / SZ_1M,
 146                 ((unsigned long long) sz_max) / SZ_1M);
 147
 148         add_memory_region(start, size, BOOT_MEM_RAM);
 149 }
 150
 151 /*
 152  * Manage initrd
 153  */
 154 #ifdef CONFIG_BLK_DEV_INITRD
 155
 156 static int __init rd_start_early(char *p)
 157 {
 158         unsigned long start = memparse(p, &p);
 159
 160 #ifdef CONFIG_64BIT
 161         /* Guess if the sign extension was forgotten by bootloader */
 162         if (start < XKPHYS)
 163                 start = (int)start;
 164 #endif
 165         initrd_start = start;
 166         initrd_end += start;
 167         return 0;
 168 }
 169 early_param("rd_start", rd_start_early);
 170
 171 static int __init rd_size_early(char *p)
 172 {
 173         initrd_end += memparse(p, &p);
 174         return 0;
 175 }
 176 early_param("rd_size", rd_size_early);
 177
 178 /* it returns the next free pfn after initrd */
 179 static unsigned long __init init_initrd(void)
 180 {
 181         unsigned long end;
 182
 183         /*
 184          * Board specific code or command line parser should have
 185          * already set up initrd_start and initrd_end. In these cases
 186          * perfom sanity checks and use them if all looks good.
 187          */
 188         if (!initrd_start || initrd_end <= initrd_start)
 189                 goto disable;
 190
 191         if (initrd_start & ~PAGE_MASK) {
 192                 pr_err("initrd start must be page aligned\n");
 193                 goto disable;
 194         }
 195         if (initrd_start < PAGE_OFFSET) {
 196                 pr_err("initrd start < PAGE_OFFSET\n");
 197                 goto disable;
 198         }
 199
 200         /*
 201          * Sanitize initrd addresses. For example firmware
 202          * can't guess if they need to pass them through
 203          * 64-bits values if the kernel has been built in pure
 204          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 205          * addresses now, so the code can now safely use __pa().
 206          */
 207         end = __pa(initrd_end);
 208         initrd_end = (unsigned long)__va(end);
 209         initrd_start = (unsigned long)__va(__pa(initrd_start));
 210
 211         ROOT_DEV = Root_RAM0;
 212         return PFN_UP(end);
 213 disable:
 214         initrd_start = 0;
 215         initrd_end = 0;
 216         return 0;
 217 }
 218
 219 /* In some conditions (e.g. big endian bootloader with a little endian
 220    kernel), the initrd might appear byte swapped.  Try to detect this and
 221    byte swap it if needed.  */
 222 static void __init maybe_bswap_initrd(void)
 223 {
 224 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 225         u64 buf;
 226
 227         /* Check for CPIO signature */
 228         if (!memcmp((void *)initrd_start, "070701", 6))
 229                 return;
 230
 231         /* Check for compressed initrd */
 232         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 233                 return;
 234
 235         /* Try again with a byte swapped header */
 236         buf = swab64p((u64 *)initrd_start);
 237         if (!memcmp(&buf, "070701", 6) ||
 238             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 239                 unsigned long i;
 240
 241                 pr_info("Byteswapped initrd detected\n");
 242                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 243                         swab64s((u64 *)i);
 244         }
 245 #endif
 246 }
 247
 248 static void __init finalize_initrd(void)
 249 {
 250         unsigned long size = initrd_end - initrd_start;
 251
 252         if (size == 0) {
 253                 printk(KERN_INFO "Initrd not found or empty");
 254                 goto disable;
 255         }
 256         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 257                 printk(KERN_ERR "Initrd extends beyond end of memory");
 258                 goto disable;
 259         }
 260
 261         maybe_bswap_initrd();
 262
 263         memblock_reserve(__pa(initrd_start), size);
 264         initrd_below_start_ok = 1;
 265
 266         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 267                 initrd_start, size);
 268         return;
 269 disable:
 270         printk(KERN_CONT " - disabling initrd\n");
 271         initrd_start = 0;
 272         initrd_end = 0;
 273 }
 274
 275 #else  /* !CONFIG_BLK_DEV_INITRD */
 276
 277 static unsigned long __init init_initrd(void)
 278 {
 279         return 0;
 280 }
 281
 282 #define finalize_initrd()       do {} while (0)
 283
 284 #endif
 285
 286 /*
 287  * Initialize the bootmem allocator. It also setup initrd related data
 288  * if needed.
 289  */
 290 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
 291
 292 static void __init bootmem_init(void)
 293 {
 294         init_initrd();
 295         finalize_initrd();
 296 }
 297
 298 #else  /* !CONFIG_SGI_IP27 */
 299
 300 static void __init bootmem_init(void)
 301 {
 302         struct memblock_region *mem;
 303         phys_addr_t ramstart, ramend;
 304
 305         ramstart = memblock_start_of_DRAM();
 306         ramend = memblock_end_of_DRAM();
 307
 308         /*
 309          * Sanity check any INITRD first. We don't take it into account
 310          * for bootmem setup initially, rely on the end-of-kernel-code
 311          * as our memory range starting point. Once bootmem is inited we
 312          * will reserve the area used for the initrd.
 313          */
 314         init_initrd();
 315
 316         /* Reserve memory occupied by kernel. */
 317         memblock_reserve(__pa_symbol(&_text),
 318                         __pa_symbol(&_end) - __pa_symbol(&_text));
 319
 320         /* max_low_pfn is not a number of pages but the end pfn of low mem */
 321
 322 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 323         ARCH_PFN_OFFSET = PFN_UP(ramstart);
 324 #else
 325         /*
 326          * Reserve any memory between the start of RAM and PHYS_OFFSET
 327          */
 328         if (ramstart > PHYS_OFFSET)
 329                 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
 330
 331         if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
 332                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 333                         (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
 334                         (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
 335         }
 336 #endif
 337
 338         min_low_pfn = ARCH_PFN_OFFSET;
 339         max_pfn = PFN_DOWN(ramend);
 340         for_each_memblock(memory, mem) {
 341                 unsigned long start = memblock_region_memory_base_pfn(mem);
 342                 unsigned long end = memblock_region_memory_end_pfn(mem);
 343
 344                 /*
 345                  * Skip highmem here so we get an accurate max_low_pfn if low
 346                  * memory stops short of high memory.
 347                  * If the region overlaps HIGHMEM_START, end is clipped so
 348                  * max_pfn excludes the highmem portion.
 349                  */
 350                 if (memblock_is_nomap(mem))
 351                         continue;
 352                 if (start >= PFN_DOWN(HIGHMEM_START))
 353                         continue;
 354                 if (end > PFN_DOWN(HIGHMEM_START))
 355                         end = PFN_DOWN(HIGHMEM_START);
 356                 if (end > max_low_pfn)
 357                         max_low_pfn = end;
 358         }
 359
 360         if (min_low_pfn >= max_low_pfn)
 361                 panic("Incorrect memory mapping !!!");
 362
 363         if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
 364 #ifdef CONFIG_HIGHMEM
 365                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 366                 highend_pfn = max_pfn;
 367 #else
 368                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 369                 max_pfn = max_low_pfn;
 370 #endif
 371         }
 372
 373
 374         /*
 375          * In any case the added to the memblock memory regions
 376          * (highmem/lowmem, available/reserved, etc) are considered
 377          * as present, so inform sparsemem about them.
 378          */
 379         memblocks_present();
 380
 381         /*
 382          * Reserve initrd memory if needed.
 383          */
 384         finalize_initrd();
 385 }
 386
 387 #endif  /* CONFIG_SGI_IP27 */
 388
 389 static int usermem __initdata;
 390
 391 static int __init early_parse_mem(char *p)
 392 {
 393         phys_addr_t start, size;
 394
 395         /*
 396          * If a user specifies memory size, we
 397          * blow away any automatically generated
 398          * size.
 399          */
 400         if (usermem == 0) {
 401                 usermem = 1;
 402                 memblock_remove(memblock_start_of_DRAM(),
 403                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
 404         }
 405         start = 0;
 406         size = memparse(p, &p);
 407         if (*p == '@')
 408                 start = memparse(p + 1, &p);
 409
 410         add_memory_region(start, size, BOOT_MEM_RAM);
 411
 412         return 0;
 413 }
 414 early_param("mem", early_parse_mem);
 415
 416 static int __init early_parse_memmap(char *p)
 417 {
 418         char *oldp;
 419         u64 start_at, mem_size;
 420
 421         if (!p)
 422                 return -EINVAL;
 423
 424         if (!strncmp(p, "exactmap", 8)) {
 425                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 426                 return 0;
 427         }
 428
 429         oldp = p;
 430         mem_size = memparse(p, &p);
 431         if (p == oldp)
 432                 return -EINVAL;
 433
 434         if (*p == '@') {
 435                 start_at = memparse(p+1, &p);
 436                 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 437         } else if (*p == '#') {
 438                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 439                 return -EINVAL;
 440         } else if (*p == '$') {
 441                 start_at = memparse(p+1, &p);
 442                 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
 443         } else {
 444                 pr_err("\"memmap\" invalid format!\n");
 445                 return -EINVAL;
 446         }
 447
 448         if (*p == '\0') {
 449                 usermem = 1;
 450                 return 0;
 451         } else
 452                 return -EINVAL;
 453 }
 454 early_param("memmap", early_parse_memmap);
 455
 456 #ifdef CONFIG_PROC_VMCORE
 457 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 458 static int __init early_parse_elfcorehdr(char *p)
 459 {
 460         struct memblock_region *mem;
 461
 462         setup_elfcorehdr = memparse(p, &p);
 463
 464          for_each_memblock(memory, mem) {
 465                 unsigned long start = mem->base;
 466                 unsigned long end = start + mem->size;
 467                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 468                         /*
 469                          * Reserve from the elf core header to the end of
 470                          * the memory segment, that should all be kdump
 471                          * reserved memory.
 472                          */
 473                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 474                         break;
 475                 }
 476         }
 477         /*
 478          * If we don't find it in the memory map, then we shouldn't
 479          * have to worry about it, as the new kernel won't use it.
 480          */
 481         return 0;
 482 }
 483 early_param("elfcorehdr", early_parse_elfcorehdr);
 484 #endif
 485
 486 #ifdef CONFIG_KEXEC
 487 static void __init mips_parse_crashkernel(void)
 488 {
 489         unsigned long long total_mem;
 490         unsigned long long crash_size, crash_base;
 491         int ret;
 492
 493         total_mem = memblock_phys_mem_size();
 494         ret = parse_crashkernel(boot_command_line, total_mem,
 495                                 &crash_size, &crash_base);
 496         if (ret != 0 || crash_size <= 0)
 497                 return;
 498
 499         if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) {
 500                 pr_warn("Invalid memory region reserved for crash kernel\n");
 501                 return;
 502         }
 503
 504         crashk_res.start = crash_base;
 505         crashk_res.end   = crash_base + crash_size - 1;
 506 }
 507
 508 static void __init request_crashkernel(struct resource *res)
 509 {
 510         int ret;
 511
 512         if (crashk_res.start == crashk_res.end)
 513                 return;
 514
 515         ret = request_resource(res, &crashk_res);
 516         if (!ret)
 517                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 518                         (unsigned long)((crashk_res.end -
 519                                          crashk_res.start + 1) >> 20),
 520                         (unsigned long)(crashk_res.start  >> 20));
 521 }
 522 #else /* !defined(CONFIG_KEXEC)         */
 523 static void __init mips_parse_crashkernel(void)
 524 {
 525 }
 526
 527 static void __init request_crashkernel(struct resource *res)
 528 {
 529 }
 530 #endif /* !defined(CONFIG_KEXEC)  */
 531
 532 static void __init check_kernel_sections_mem(void)
 533 {
 534         phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text)));
 535         phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start;
 536
 537         if (!memblock_is_region_memory(start, size)) {
 538                 pr_info("Kernel sections are not in the memory maps\n");
 539                 memblock_add(start, size);
 540         }
 541 }
 542
 543 static void __init bootcmdline_append(const char *s, size_t max)
 544 {
 545         if (!s[0] || !max)
 546                 return;
 547
 548         if (boot_command_line[0])
 549                 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 550
 551         strlcat(boot_command_line, s, max);
 552 }
 553
 554 #ifdef CONFIG_OF_EARLY_FLATTREE
 555
 556 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
 557                                           int depth, void *data)
 558 {
 559         bool *dt_bootargs = data;
 560         const char *p;
 561         int l;
 562
 563         if (depth != 1 || !data ||
 564             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
 565                 return 0;
 566
 567         p = of_get_flat_dt_prop(node, "bootargs", &l);
 568         if (p != NULL && l > 0) {
 569                 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
 570                 *dt_bootargs = true;
 571         }
 572
 573         return 1;
 574 }
 575
 576 #endif /* CONFIG_OF_EARLY_FLATTREE */
 577
 578 static void __init bootcmdline_init(char **cmdline_p)
 579 {
 580         bool dt_bootargs = false;
 581
 582         /*
 583          * If CMDLINE_OVERRIDE is enabled then initializing the command line is
 584          * trivial - we simply use the built-in command line unconditionally &
 585          * unmodified.
 586          */
 587         if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
 588                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 589                 return;
 590         }
 591
 592         /*
 593          * If the user specified a built-in command line &
 594          * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
 595          * prepended to arguments from the bootloader or DT so we'll copy them
 596          * to the start of boot_command_line here. Otherwise, empty
 597          * boot_command_line to undo anything early_init_dt_scan_chosen() did.
 598          */
 599         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 600                 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 601         else
 602                 boot_command_line[0] = 0;
 603
 604 #ifdef CONFIG_OF_EARLY_FLATTREE
 605         /*
 606          * If we're configured to take boot arguments from DT, look for those
 607          * now.
 608          */
 609         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB))
 610                 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
 611 #endif
 612
 613         /*
 614          * If we didn't get any arguments from DT (regardless of whether that's
 615          * because we weren't configured to look for them, or because we looked
 616          * & found none) then we'll take arguments from the bootloader.
 617          * plat_mem_setup() should have filled arcs_cmdline with arguments from
 618          * the bootloader.
 619          */
 620         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
 621                 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
 622
 623         /*
 624          * If the user specified a built-in command line & we didn't already
 625          * prepend it, we append it to boot_command_line here.
 626          */
 627         if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
 628             !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 629                 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
 630 }
 631
 632 /*
 633  * arch_mem_init - initialize memory management subsystem
 634  *
 635  *  o plat_mem_setup() detects the memory configuration and will record detected
 636  *    memory areas using add_memory_region.
 637  *
 638  * At this stage the memory configuration of the system is known to the
 639  * kernel but generic memory management system is still entirely uninitialized.
 640  *
 641  *  o bootmem_init()
 642  *  o sparse_init()
 643  *  o paging_init()
 644  *  o dma_contiguous_reserve()
 645  *
 646  * At this stage the bootmem allocator is ready to use.
 647  *
 648  * NOTE: historically plat_mem_setup did the entire platform initialization.
 649  *       This was rather impractical because it meant plat_mem_setup had to
 650  * get away without any kind of memory allocator.  To keep old code from
 651  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 652  * initialization hook for anything else was introduced.
 653  */
 654 static void __init arch_mem_init(char **cmdline_p)
 655 {
 656         extern void plat_mem_setup(void);
 657
 658         /* call board setup routine */
 659         plat_mem_setup();
 660         memblock_set_bottom_up(true);
 661
 662         bootcmdline_init(cmdline_p);
 663         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 664         *cmdline_p = command_line;
 665
 666         parse_early_param();
 667
 668         if (usermem)
 669                 pr_info("User-defined physical RAM map overwrite\n");
 670
 671         check_kernel_sections_mem();
 672
 673         early_init_fdt_reserve_self();
 674         early_init_fdt_scan_reserved_mem();
 675
 676 #ifndef CONFIG_NUMA
 677         memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
 678 #endif
 679         bootmem_init();
 680
 681         /*
 682          * Prevent memblock from allocating high memory.
 683          * This cannot be done before max_low_pfn is detected, so up
 684          * to this point is possible to only reserve physical memory
 685          * with memblock_reserve; memblock_alloc* can be used
 686          * only after this point
 687          */
 688         memblock_set_current_limit(PFN_PHYS(max_low_pfn));
 689
 690 #ifdef CONFIG_PROC_VMCORE
 691         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 692                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 693                        setup_elfcorehdr, setup_elfcorehdr_size);
 694                 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
 695         }
 696 #endif
 697
 698         mips_parse_crashkernel();
 699 #ifdef CONFIG_KEXEC
 700         if (crashk_res.start != crashk_res.end)
 701                 memblock_reserve(crashk_res.start,
 702                                  crashk_res.end - crashk_res.start + 1);
 703 #endif
 704         device_tree_init();
 705         sparse_init();
 706         plat_swiotlb_setup();
 707
 708         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 709
 710         /* Reserve for hibernation. */
 711         memblock_reserve(__pa_symbol(&__nosave_begin),
 712                 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
 713
 714         fdt_init_reserved_mem();
 715
 716         memblock_dump_all();
 717
 718         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 719 }
 720
 721 static void __init resource_init(void)
 722 {
 723         struct memblock_region *region;
 724
 725         if (UNCAC_BASE != IO_BASE)
 726                 return;
 727
 728         code_resource.start = __pa_symbol(&_text);
 729         code_resource.end = __pa_symbol(&_etext) - 1;
 730         data_resource.start = __pa_symbol(&_etext);
 731         data_resource.end = __pa_symbol(&_edata) - 1;
 732         bss_resource.start = __pa_symbol(&__bss_start);
 733         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 734
 735         for_each_memblock(memory, region) {
 736                 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
 737                 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
 738                 struct resource *res;
 739
 740                 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
 741                 if (!res)
 742                         panic("%s: Failed to allocate %zu bytes\n", __func__,
 743                               sizeof(struct resource));
 744
 745                 res->start = start;
 746                 res->end = end;
 747                 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 748                 res->name = "System RAM";
 749
 750                 request_resource(&iomem_resource, res);
 751
 752                 /*
 753                  *  We don't know which RAM region contains kernel data,
 754                  *  so we try it repeatedly and let the resource manager
 755                  *  test it.
 756                  */
 757                 request_resource(res, &code_resource);
 758                 request_resource(res, &data_resource);
 759                 request_resource(res, &bss_resource);
 760                 request_crashkernel(res);
 761         }
 762 }
 763
 764 #ifdef CONFIG_SMP
 765 static void __init prefill_possible_map(void)
 766 {
 767         int i, possible = num_possible_cpus();
 768
 769         if (possible > nr_cpu_ids)
 770                 possible = nr_cpu_ids;
 771
 772         for (i = 0; i < possible; i++)
 773                 set_cpu_possible(i, true);
 774         for (; i < NR_CPUS; i++)
 775                 set_cpu_possible(i, false);
 776
 777         nr_cpu_ids = possible;
 778 }
 779 #else
 780 static inline void prefill_possible_map(void) {}
 781 #endif
 782
 783 void __init setup_arch(char **cmdline_p)
 784 {
 785         cpu_probe();
 786         mips_cm_probe();
 787         prom_init();
 788
 789         setup_early_fdc_console();
 790 #ifdef CONFIG_EARLY_PRINTK
 791         setup_early_printk();
 792 #endif
 793         cpu_report();
 794         check_bugs_early();
 795
 796 #if defined(CONFIG_VT)
 797 #if defined(CONFIG_VGA_CONSOLE)
 798         conswitchp = &vga_con;
 799 #elif defined(CONFIG_DUMMY_CONSOLE)
 800         conswitchp = &dummy_con;
 801 #endif
 802 #endif
 803
 804         arch_mem_init(cmdline_p);
 805
 806         resource_init();
 807         plat_smp_setup();
 808         prefill_possible_map();
 809
 810         cpu_cache_init();
 811         paging_init();
 812 }
 813
 814 unsigned long kernelsp[NR_CPUS];
 815 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 816
 817 #ifdef CONFIG_USE_OF
 818 unsigned long fw_passed_dtb;
 819 #endif
 820
 821 #ifdef CONFIG_DEBUG_FS
 822 struct dentry *mips_debugfs_dir;
 823 static int __init debugfs_mips(void)
 824 {
 825         mips_debugfs_dir = debugfs_create_dir("mips", NULL);
 826         return 0;
 827 }
 828 arch_initcall(debugfs_mips);
 829 #endif
 830
 831 #ifdef CONFIG_DMA_MAYBE_COHERENT
 832 /* User defined DMA coherency from command line. */
 833 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
 834 EXPORT_SYMBOL_GPL(coherentio);
 835 int hw_coherentio = 0;  /* Actual hardware supported DMA coherency setting. */
 836
 837 static int __init setcoherentio(char *str)
 838 {
 839         coherentio = IO_COHERENCE_ENABLED;
 840         pr_info("Hardware DMA cache coherency (command line)\n");
 841         return 0;
 842 }
 843 early_param("coherentio", setcoherentio);
 844
 845 static int __init setnocoherentio(char *str)
 846 {
 847         coherentio = IO_COHERENCE_DISABLED;
 848         pr_info("Software DMA cache coherency (command line)\n");
 849         return 0;
 850 }
 851 early_param("nocoherentio", setnocoherentio);
 852 #endif