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 #include <linux/dmi.h>
  32
  33 #include <asm/addrspace.h>
  34 #include <asm/bootinfo.h>
  35 #include <asm/bugs.h>
  36 #include <asm/cache.h>
  37 #include <asm/cdmm.h>
  38 #include <asm/cpu.h>
  39 #include <asm/debug.h>
  40 #include <asm/dma-coherence.h>
  41 #include <asm/sections.h>
  42 #include <asm/setup.h>
  43 #include <asm/smp-ops.h>
  44 #include <asm/prom.h>
  45
  46 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  47 const char __section(.appended_dtb) __appended_dtb[0x100000];
  48 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  49
  50 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  51
  52 EXPORT_SYMBOL(cpu_data);
  53
  54 #ifdef CONFIG_VT
  55 struct screen_info screen_info;
  56 #endif
  57
  58 /*
  59  * Setup information
  60  *
  61  * These are initialized so they are in the .data section
  62  */
  63 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  64
  65 EXPORT_SYMBOL(mips_machtype);
  66
  67 static char __initdata command_line[COMMAND_LINE_SIZE];
  68 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  69
  70 #ifdef CONFIG_CMDLINE_BOOL
  71 static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
  72 #else
  73 static const char builtin_cmdline[] __initconst = "";
  74 #endif
  75
  76 /*
  77  * mips_io_port_base is the begin of the address space to which x86 style
  78  * I/O ports are mapped.
  79  */
  80 unsigned long mips_io_port_base = -1;
  81 EXPORT_SYMBOL(mips_io_port_base);
  82
  83 static struct resource code_resource = { .name = "Kernel code", };
  84 static struct resource data_resource = { .name = "Kernel data", };
  85 static struct resource bss_resource = { .name = "Kernel bss", };
  86
  87 static void *detect_magic __initdata = detect_memory_region;
  88
  89 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
  90 unsigned long ARCH_PFN_OFFSET;
  91 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
  92 #endif
  93
  94 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
  95 {
  96         /*
  97          * Note: This function only exists for historical reason,
  98          * new code should use memblock_add or memblock_add_node instead.
  99          */
 100
 101         /*
 102          * If the region reaches the top of the physical address space, adjust
 103          * the size slightly so that (start + size) doesn't overflow
 104          */
 105         if (start + size - 1 == PHYS_ADDR_MAX)
 106                 --size;
 107
 108         /* Sanity check */
 109         if (start + size < start) {
 110                 pr_warn("Trying to add an invalid memory region, skipped\n");
 111                 return;
 112         }
 113
 114         if (start < PHYS_OFFSET)
 115                 return;
 116
 117         memblock_add(start, size);
 118         /* Reserve any memory except the ordinary RAM ranges. */
 119         switch (type) {
 120         case BOOT_MEM_RAM:
 121                 break;
 122
 123         case BOOT_MEM_NOMAP: /* Discard the range from the system. */
 124                 memblock_remove(start, size);
 125                 break;
 126
 127         default: /* Reserve the rest of the memory types at boot time */
 128                 memblock_reserve(start, size);
 129                 break;
 130         }
 131 }
 132
 133 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
 134 {
 135         void *dm = &detect_magic;
 136         phys_addr_t size;
 137
 138         for (size = sz_min; size < sz_max; size <<= 1) {
 139                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 140                         break;
 141         }
 142
 143         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 144                 ((unsigned long long) size) / SZ_1M,
 145                 (unsigned long long) start,
 146                 ((unsigned long long) sz_min) / SZ_1M,
 147                 ((unsigned long long) sz_max) / SZ_1M);
 148
 149         add_memory_region(start, size, BOOT_MEM_RAM);
 150 }
 151
 152 /*
 153  * Manage initrd
 154  */
 155 #ifdef CONFIG_BLK_DEV_INITRD
 156
 157 static int __init rd_start_early(char *p)
 158 {
 159         unsigned long start = memparse(p, &p);
 160
 161 #ifdef CONFIG_64BIT
 162         /* Guess if the sign extension was forgotten by bootloader */
 163         if (start < XKPHYS)
 164                 start = (int)start;
 165 #endif
 166         initrd_start = start;
 167         initrd_end += start;
 168         return 0;
 169 }
 170 early_param("rd_start", rd_start_early);
 171
 172 static int __init rd_size_early(char *p)
 173 {
 174         initrd_end += memparse(p, &p);
 175         return 0;
 176 }
 177 early_param("rd_size", rd_size_early);
 178
 179 /* it returns the next free pfn after initrd */
 180 static unsigned long __init init_initrd(void)
 181 {
 182         unsigned long end;
 183
 184         /*
 185          * Board specific code or command line parser should have
 186          * already set up initrd_start and initrd_end. In these cases
 187          * perfom sanity checks and use them if all looks good.
 188          */
 189         if (!initrd_start || initrd_end <= initrd_start)
 190                 goto disable;
 191
 192         if (initrd_start & ~PAGE_MASK) {
 193                 pr_err("initrd start must be page aligned\n");
 194                 goto disable;
 195         }
 196         if (initrd_start < PAGE_OFFSET) {
 197                 pr_err("initrd start < PAGE_OFFSET\n");
 198                 goto disable;
 199         }
 200
 201         /*
 202          * Sanitize initrd addresses. For example firmware
 203          * can't guess if they need to pass them through
 204          * 64-bits values if the kernel has been built in pure
 205          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 206          * addresses now, so the code can now safely use __pa().
 207          */
 208         end = __pa(initrd_end);
 209         initrd_end = (unsigned long)__va(end);
 210         initrd_start = (unsigned long)__va(__pa(initrd_start));
 211
 212         ROOT_DEV = Root_RAM0;
 213         return PFN_UP(end);
 214 disable:
 215         initrd_start = 0;
 216         initrd_end = 0;
 217         return 0;
 218 }
 219
 220 /* In some conditions (e.g. big endian bootloader with a little endian
 221    kernel), the initrd might appear byte swapped.  Try to detect this and
 222    byte swap it if needed.  */
 223 static void __init maybe_bswap_initrd(void)
 224 {
 225 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 226         u64 buf;
 227
 228         /* Check for CPIO signature */
 229         if (!memcmp((void *)initrd_start, "070701", 6))
 230                 return;
 231
 232         /* Check for compressed initrd */
 233         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 234                 return;
 235
 236         /* Try again with a byte swapped header */
 237         buf = swab64p((u64 *)initrd_start);
 238         if (!memcmp(&buf, "070701", 6) ||
 239             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 240                 unsigned long i;
 241
 242                 pr_info("Byteswapped initrd detected\n");
 243                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 244                         swab64s((u64 *)i);
 245         }
 246 #endif
 247 }
 248
 249 static void __init finalize_initrd(void)
 250 {
 251         unsigned long size = initrd_end - initrd_start;
 252
 253         if (size == 0) {
 254                 printk(KERN_INFO "Initrd not found or empty");
 255                 goto disable;
 256         }
 257         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 258                 printk(KERN_ERR "Initrd extends beyond end of memory");
 259                 goto disable;
 260         }
 261
 262         maybe_bswap_initrd();
 263
 264         memblock_reserve(__pa(initrd_start), size);
 265         initrd_below_start_ok = 1;
 266
 267         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 268                 initrd_start, size);
 269         return;
 270 disable:
 271         printk(KERN_CONT " - disabling initrd\n");
 272         initrd_start = 0;
 273         initrd_end = 0;
 274 }
 275
 276 #else  /* !CONFIG_BLK_DEV_INITRD */
 277
 278 static unsigned long __init init_initrd(void)
 279 {
 280         return 0;
 281 }
 282
 283 #define finalize_initrd()       do {} while (0)
 284
 285 #endif
 286
 287 /*
 288  * Initialize the bootmem allocator. It also setup initrd related data
 289  * if needed.
 290  */
 291 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
 292
 293 static void __init bootmem_init(void)
 294 {
 295         init_initrd();
 296         finalize_initrd();
 297 }
 298
 299 #else  /* !CONFIG_SGI_IP27 */
 300
 301 static void __init bootmem_init(void)
 302 {
 303         struct memblock_region *mem;
 304         phys_addr_t ramstart, ramend;
 305
 306         ramstart = memblock_start_of_DRAM();
 307         ramend = memblock_end_of_DRAM();
 308
 309         /*
 310          * Sanity check any INITRD first. We don't take it into account
 311          * for bootmem setup initially, rely on the end-of-kernel-code
 312          * as our memory range starting point. Once bootmem is inited we
 313          * will reserve the area used for the initrd.
 314          */
 315         init_initrd();
 316
 317         /* Reserve memory occupied by kernel. */
 318         memblock_reserve(__pa_symbol(&_text),
 319                         __pa_symbol(&_end) - __pa_symbol(&_text));
 320
 321         /* max_low_pfn is not a number of pages but the end pfn of low mem */
 322
 323 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 324         ARCH_PFN_OFFSET = PFN_UP(ramstart);
 325 #else
 326         /*
 327          * Reserve any memory between the start of RAM and PHYS_OFFSET
 328          */
 329         if (ramstart > PHYS_OFFSET)
 330                 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
 331
 332         if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
 333                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 334                         (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
 335                         (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
 336         }
 337 #endif
 338
 339         min_low_pfn = ARCH_PFN_OFFSET;
 340         max_pfn = PFN_DOWN(ramend);
 341         for_each_memblock(memory, mem) {
 342                 unsigned long start = memblock_region_memory_base_pfn(mem);
 343                 unsigned long end = memblock_region_memory_end_pfn(mem);
 344
 345                 /*
 346                  * Skip highmem here so we get an accurate max_low_pfn if low
 347                  * memory stops short of high memory.
 348                  * If the region overlaps HIGHMEM_START, end is clipped so
 349                  * max_pfn excludes the highmem portion.
 350                  */
 351                 if (memblock_is_nomap(mem))
 352                         continue;
 353                 if (start >= PFN_DOWN(HIGHMEM_START))
 354                         continue;
 355                 if (end > PFN_DOWN(HIGHMEM_START))
 356                         end = PFN_DOWN(HIGHMEM_START);
 357                 if (end > max_low_pfn)
 358                         max_low_pfn = end;
 359         }
 360
 361         if (min_low_pfn >= max_low_pfn)
 362                 panic("Incorrect memory mapping !!!");
 363
 364         if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
 365 #ifdef CONFIG_HIGHMEM
 366                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 367                 highend_pfn = max_pfn;
 368 #else
 369                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 370                 max_pfn = max_low_pfn;
 371 #endif
 372         }
 373
 374
 375         /*
 376          * In any case the added to the memblock memory regions
 377          * (highmem/lowmem, available/reserved, etc) are considered
 378          * as present, so inform sparsemem about them.
 379          */
 380         memblocks_present();
 381
 382         /*
 383          * Reserve initrd memory if needed.
 384          */
 385         finalize_initrd();
 386 }
 387
 388 #endif  /* CONFIG_SGI_IP27 */
 389
 390 static int usermem __initdata;
 391
 392 static int __init early_parse_mem(char *p)
 393 {
 394         phys_addr_t start, size;
 395
 396         /*
 397          * If a user specifies memory size, we
 398          * blow away any automatically generated
 399          * size.
 400          */
 401         if (usermem == 0) {
 402                 usermem = 1;
 403                 memblock_remove(memblock_start_of_DRAM(),
 404                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
 405         }
 406         start = 0;
 407         size = memparse(p, &p);
 408         if (*p == '@')
 409                 start = memparse(p + 1, &p);
 410
 411         add_memory_region(start, size, BOOT_MEM_RAM);
 412
 413         return 0;
 414 }
 415 early_param("mem", early_parse_mem);
 416
 417 static int __init early_parse_memmap(char *p)
 418 {
 419         char *oldp;
 420         u64 start_at, mem_size;
 421
 422         if (!p)
 423                 return -EINVAL;
 424
 425         if (!strncmp(p, "exactmap", 8)) {
 426                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 427                 return 0;
 428         }
 429
 430         oldp = p;
 431         mem_size = memparse(p, &p);
 432         if (p == oldp)
 433                 return -EINVAL;
 434
 435         if (*p == '@') {
 436                 start_at = memparse(p+1, &p);
 437                 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 438         } else if (*p == '#') {
 439                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 440                 return -EINVAL;
 441         } else if (*p == '$') {
 442                 start_at = memparse(p+1, &p);
 443                 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
 444         } else {
 445                 pr_err("\"memmap\" invalid format!\n");
 446                 return -EINVAL;
 447         }
 448
 449         if (*p == '\0') {
 450                 usermem = 1;
 451                 return 0;
 452         } else
 453                 return -EINVAL;
 454 }
 455 early_param("memmap", early_parse_memmap);
 456
 457 #ifdef CONFIG_PROC_VMCORE
 458 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 459 static int __init early_parse_elfcorehdr(char *p)
 460 {
 461         struct memblock_region *mem;
 462
 463         setup_elfcorehdr = memparse(p, &p);
 464
 465          for_each_memblock(memory, mem) {
 466                 unsigned long start = mem->base;
 467                 unsigned long end = start + mem->size;
 468                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 469                         /*
 470                          * Reserve from the elf core header to the end of
 471                          * the memory segment, that should all be kdump
 472                          * reserved memory.
 473                          */
 474                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 475                         break;
 476                 }
 477         }
 478         /*
 479          * If we don't find it in the memory map, then we shouldn't
 480          * have to worry about it, as the new kernel won't use it.
 481          */
 482         return 0;
 483 }
 484 early_param("elfcorehdr", early_parse_elfcorehdr);
 485 #endif
 486
 487 #ifdef CONFIG_KEXEC
 488 static void __init mips_parse_crashkernel(void)
 489 {
 490         unsigned long long total_mem;
 491         unsigned long long crash_size, crash_base;
 492         int ret;
 493
 494         total_mem = memblock_phys_mem_size();
 495         ret = parse_crashkernel(boot_command_line, total_mem,
 496                                 &crash_size, &crash_base);
 497         if (ret != 0 || crash_size <= 0)
 498                 return;
 499
 500         if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) {
 501                 pr_warn("Invalid memory region reserved for crash kernel\n");
 502                 return;
 503         }
 504
 505         crashk_res.start = crash_base;
 506         crashk_res.end   = crash_base + crash_size - 1;
 507 }
 508
 509 static void __init request_crashkernel(struct resource *res)
 510 {
 511         int ret;
 512
 513         if (crashk_res.start == crashk_res.end)
 514                 return;
 515
 516         ret = request_resource(res, &crashk_res);
 517         if (!ret)
 518                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 519                         (unsigned long)(resource_size(&crashk_res) >> 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             IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
 611                 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
 612 #endif
 613
 614         /*
 615          * If we didn't get any arguments from DT (regardless of whether that's
 616          * because we weren't configured to look for them, or because we looked
 617          * & found none) then we'll take arguments from the bootloader.
 618          * plat_mem_setup() should have filled arcs_cmdline with arguments from
 619          * the bootloader.
 620          */
 621         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
 622                 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
 623
 624         /*
 625          * If the user specified a built-in command line & we didn't already
 626          * prepend it, we append it to boot_command_line here.
 627          */
 628         if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
 629             !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 630                 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
 631 }
 632
 633 /*
 634  * arch_mem_init - initialize memory management subsystem
 635  *
 636  *  o plat_mem_setup() detects the memory configuration and will record detected
 637  *    memory areas using add_memory_region.
 638  *
 639  * At this stage the memory configuration of the system is known to the
 640  * kernel but generic memory management system is still entirely uninitialized.
 641  *
 642  *  o bootmem_init()
 643  *  o sparse_init()
 644  *  o paging_init()
 645  *  o dma_contiguous_reserve()
 646  *
 647  * At this stage the bootmem allocator is ready to use.
 648  *
 649  * NOTE: historically plat_mem_setup did the entire platform initialization.
 650  *       This was rather impractical because it meant plat_mem_setup had to
 651  * get away without any kind of memory allocator.  To keep old code from
 652  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 653  * initialization hook for anything else was introduced.
 654  */
 655 static void __init arch_mem_init(char **cmdline_p)
 656 {
 657         extern void plat_mem_setup(void);
 658
 659         /* call board setup routine */
 660         plat_mem_setup();
 661         memblock_set_bottom_up(true);
 662
 663         bootcmdline_init(cmdline_p);
 664         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 665         *cmdline_p = command_line;
 666
 667         parse_early_param();
 668
 669         if (usermem)
 670                 pr_info("User-defined physical RAM map overwrite\n");
 671
 672         check_kernel_sections_mem();
 673
 674         early_init_fdt_reserve_self();
 675         early_init_fdt_scan_reserved_mem();
 676
 677 #ifndef CONFIG_NUMA
 678         memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
 679 #endif
 680         bootmem_init();
 681
 682         /*
 683          * Prevent memblock from allocating high memory.
 684          * This cannot be done before max_low_pfn is detected, so up
 685          * to this point is possible to only reserve physical memory
 686          * with memblock_reserve; memblock_alloc* can be used
 687          * only after this point
 688          */
 689         memblock_set_current_limit(PFN_PHYS(max_low_pfn));
 690
 691 #ifdef CONFIG_PROC_VMCORE
 692         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 693                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 694                        setup_elfcorehdr, setup_elfcorehdr_size);
 695                 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
 696         }
 697 #endif
 698
 699         mips_parse_crashkernel();
 700 #ifdef CONFIG_KEXEC
 701         if (crashk_res.start != crashk_res.end)
 702                 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
 703 #endif
 704         device_tree_init();
 705
 706         /*
 707          * In order to reduce the possibility of kernel panic when failed to
 708          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
 709          * low memory as small as possible before plat_swiotlb_setup(), so
 710          * make sparse_init() using top-down allocation.
 711          */
 712         memblock_set_bottom_up(false);
 713         sparse_init();
 714         memblock_set_bottom_up(true);
 715
 716         plat_swiotlb_setup();
 717
 718         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 719
 720         /* Reserve for hibernation. */
 721         memblock_reserve(__pa_symbol(&__nosave_begin),
 722                 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
 723
 724         fdt_init_reserved_mem();
 725
 726         memblock_dump_all();
 727
 728         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 729 }
 730
 731 static void __init resource_init(void)
 732 {
 733         struct memblock_region *region;
 734
 735         if (UNCAC_BASE != IO_BASE)
 736                 return;
 737
 738         code_resource.start = __pa_symbol(&_text);
 739         code_resource.end = __pa_symbol(&_etext) - 1;
 740         data_resource.start = __pa_symbol(&_etext);
 741         data_resource.end = __pa_symbol(&_edata) - 1;
 742         bss_resource.start = __pa_symbol(&__bss_start);
 743         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 744
 745         for_each_memblock(memory, region) {
 746                 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
 747                 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
 748                 struct resource *res;
 749
 750                 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
 751                 if (!res)
 752                         panic("%s: Failed to allocate %zu bytes\n", __func__,
 753                               sizeof(struct resource));
 754
 755                 res->start = start;
 756                 res->end = end;
 757                 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 758                 res->name = "System RAM";
 759
 760                 request_resource(&iomem_resource, res);
 761
 762                 /*
 763                  *  We don't know which RAM region contains kernel data,
 764                  *  so we try it repeatedly and let the resource manager
 765                  *  test it.
 766                  */
 767                 request_resource(res, &code_resource);
 768                 request_resource(res, &data_resource);
 769                 request_resource(res, &bss_resource);
 770                 request_crashkernel(res);
 771         }
 772 }
 773
 774 #ifdef CONFIG_SMP
 775 static void __init prefill_possible_map(void)
 776 {
 777         int i, possible = num_possible_cpus();
 778
 779         if (possible > nr_cpu_ids)
 780                 possible = nr_cpu_ids;
 781
 782         for (i = 0; i < possible; i++)
 783                 set_cpu_possible(i, true);
 784         for (; i < NR_CPUS; i++)
 785                 set_cpu_possible(i, false);
 786
 787         nr_cpu_ids = possible;
 788 }
 789 #else
 790 static inline void prefill_possible_map(void) {}
 791 #endif
 792
 793 void __init setup_arch(char **cmdline_p)
 794 {
 795         cpu_probe();
 796         mips_cm_probe();
 797         prom_init();
 798
 799         setup_early_fdc_console();
 800 #ifdef CONFIG_EARLY_PRINTK
 801         setup_early_printk();
 802 #endif
 803         cpu_report();
 804         check_bugs_early();
 805
 806 #if defined(CONFIG_VT)
 807 #if defined(CONFIG_VGA_CONSOLE)
 808         conswitchp = &vga_con;
 809 #endif
 810 #endif
 811
 812         arch_mem_init(cmdline_p);
 813         dmi_setup();
 814
 815         resource_init();
 816         plat_smp_setup();
 817         prefill_possible_map();
 818
 819         cpu_cache_init();
 820         paging_init();
 821 }
 822
 823 unsigned long kernelsp[NR_CPUS];
 824 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 825
 826 #ifdef CONFIG_USE_OF
 827 unsigned long fw_passed_dtb;
 828 #endif
 829
 830 #ifdef CONFIG_DEBUG_FS
 831 struct dentry *mips_debugfs_dir;
 832 static int __init debugfs_mips(void)
 833 {
 834         mips_debugfs_dir = debugfs_create_dir("mips", NULL);
 835         return 0;
 836 }
 837 arch_initcall(debugfs_mips);
 838 #endif
 839
 840 #ifdef CONFIG_DMA_MAYBE_COHERENT
 841 /* User defined DMA coherency from command line. */
 842 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
 843 EXPORT_SYMBOL_GPL(coherentio);
 844 int hw_coherentio = 0;  /* Actual hardware supported DMA coherency setting. */
 845
 846 static int __init setcoherentio(char *str)
 847 {
 848         coherentio = IO_COHERENCE_ENABLED;
 849         pr_info("Hardware DMA cache coherency (command line)\n");
 850         return 0;
 851 }
 852 early_param("coherentio", setcoherentio);
 853
 854 static int __init setnocoherentio(char *str)
 855 {
 856         coherentio = IO_COHERENCE_DISABLED;
 857         pr_info("Software DMA cache coherency (command line)\n");
 858         return 0;
 859 }
 860 early_param("nocoherentio", setnocoherentio);
 861 #endif