linux/arch/mips/kernel/setup.c
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   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-map-ops.h>
  28#include <linux/decompress/generic.h>
  29#include <linux/of_fdt.h>
  30#include <linux/dmi.h>
  31#include <linux/crash_dump.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/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
  46char __section(".appended_dtb") __appended_dtb[0x100000];
  47#endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  48
  49struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  50
  51EXPORT_SYMBOL(cpu_data);
  52
  53#ifdef CONFIG_VT
  54struct screen_info screen_info;
  55#endif
  56
  57/*
  58 * Setup information
  59 *
  60 * These are initialized so they are in the .data section
  61 */
  62unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  63
  64EXPORT_SYMBOL(mips_machtype);
  65
  66static char __initdata command_line[COMMAND_LINE_SIZE];
  67char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  68
  69#ifdef CONFIG_CMDLINE_BOOL
  70static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
  71#else
  72static 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 */
  79unsigned long mips_io_port_base = -1;
  80EXPORT_SYMBOL(mips_io_port_base);
  81
  82static struct resource code_resource = { .name = "Kernel code", };
  83static struct resource data_resource = { .name = "Kernel data", };
  84static struct resource bss_resource = { .name = "Kernel bss", };
  85
  86unsigned long __kaslr_offset __ro_after_init;
  87EXPORT_SYMBOL(__kaslr_offset);
  88
  89static void *detect_magic __initdata = detect_memory_region;
  90
  91#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
  92unsigned long ARCH_PFN_OFFSET;
  93EXPORT_SYMBOL(ARCH_PFN_OFFSET);
  94#endif
  95
  96void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
  97{
  98        void *dm = &detect_magic;
  99        phys_addr_t size;
 100
 101        for (size = sz_min; size < sz_max; size <<= 1) {
 102                if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 103                        break;
 104        }
 105
 106        pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 107                ((unsigned long long) size) / SZ_1M,
 108                (unsigned long long) start,
 109                ((unsigned long long) sz_min) / SZ_1M,
 110                ((unsigned long long) sz_max) / SZ_1M);
 111
 112        memblock_add(start, size);
 113}
 114
 115/*
 116 * Manage initrd
 117 */
 118#ifdef CONFIG_BLK_DEV_INITRD
 119
 120static int __init rd_start_early(char *p)
 121{
 122        unsigned long start = memparse(p, &p);
 123
 124#ifdef CONFIG_64BIT
 125        /* Guess if the sign extension was forgotten by bootloader */
 126        if (start < XKPHYS)
 127                start = (int)start;
 128#endif
 129        initrd_start = start;
 130        initrd_end += start;
 131        return 0;
 132}
 133early_param("rd_start", rd_start_early);
 134
 135static int __init rd_size_early(char *p)
 136{
 137        initrd_end += memparse(p, &p);
 138        return 0;
 139}
 140early_param("rd_size", rd_size_early);
 141
 142/* it returns the next free pfn after initrd */
 143static unsigned long __init init_initrd(void)
 144{
 145        unsigned long end;
 146
 147        /*
 148         * Board specific code or command line parser should have
 149         * already set up initrd_start and initrd_end. In these cases
 150         * perfom sanity checks and use them if all looks good.
 151         */
 152        if (!initrd_start || initrd_end <= initrd_start)
 153                goto disable;
 154
 155        if (initrd_start & ~PAGE_MASK) {
 156                pr_err("initrd start must be page aligned\n");
 157                goto disable;
 158        }
 159        if (initrd_start < PAGE_OFFSET) {
 160                pr_err("initrd start < PAGE_OFFSET\n");
 161                goto disable;
 162        }
 163
 164        /*
 165         * Sanitize initrd addresses. For example firmware
 166         * can't guess if they need to pass them through
 167         * 64-bits values if the kernel has been built in pure
 168         * 32-bit. We need also to switch from KSEG0 to XKPHYS
 169         * addresses now, so the code can now safely use __pa().
 170         */
 171        end = __pa(initrd_end);
 172        initrd_end = (unsigned long)__va(end);
 173        initrd_start = (unsigned long)__va(__pa(initrd_start));
 174
 175        ROOT_DEV = Root_RAM0;
 176        return PFN_UP(end);
 177disable:
 178        initrd_start = 0;
 179        initrd_end = 0;
 180        return 0;
 181}
 182
 183/* In some conditions (e.g. big endian bootloader with a little endian
 184   kernel), the initrd might appear byte swapped.  Try to detect this and
 185   byte swap it if needed.  */
 186static void __init maybe_bswap_initrd(void)
 187{
 188#if defined(CONFIG_CPU_CAVIUM_OCTEON)
 189        u64 buf;
 190
 191        /* Check for CPIO signature */
 192        if (!memcmp((void *)initrd_start, "070701", 6))
 193                return;
 194
 195        /* Check for compressed initrd */
 196        if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 197                return;
 198
 199        /* Try again with a byte swapped header */
 200        buf = swab64p((u64 *)initrd_start);
 201        if (!memcmp(&buf, "070701", 6) ||
 202            decompress_method((unsigned char *)(&buf), 8, NULL)) {
 203                unsigned long i;
 204
 205                pr_info("Byteswapped initrd detected\n");
 206                for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 207                        swab64s((u64 *)i);
 208        }
 209#endif
 210}
 211
 212static void __init finalize_initrd(void)
 213{
 214        unsigned long size = initrd_end - initrd_start;
 215
 216        if (size == 0) {
 217                printk(KERN_INFO "Initrd not found or empty");
 218                goto disable;
 219        }
 220        if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 221                printk(KERN_ERR "Initrd extends beyond end of memory");
 222                goto disable;
 223        }
 224
 225        maybe_bswap_initrd();
 226
 227        memblock_reserve(__pa(initrd_start), size);
 228        initrd_below_start_ok = 1;
 229
 230        pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 231                initrd_start, size);
 232        return;
 233disable:
 234        printk(KERN_CONT " - disabling initrd\n");
 235        initrd_start = 0;
 236        initrd_end = 0;
 237}
 238
 239#else  /* !CONFIG_BLK_DEV_INITRD */
 240
 241static unsigned long __init init_initrd(void)
 242{
 243        return 0;
 244}
 245
 246#define finalize_initrd()       do {} while (0)
 247
 248#endif
 249
 250/*
 251 * Initialize the bootmem allocator. It also setup initrd related data
 252 * if needed.
 253 */
 254#if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
 255
 256static void __init bootmem_init(void)
 257{
 258        init_initrd();
 259        finalize_initrd();
 260}
 261
 262#else  /* !CONFIG_SGI_IP27 */
 263
 264static void __init bootmem_init(void)
 265{
 266        phys_addr_t ramstart, ramend;
 267        unsigned long start, end;
 268        int i;
 269
 270        ramstart = memblock_start_of_DRAM();
 271        ramend = memblock_end_of_DRAM();
 272
 273        /*
 274         * Sanity check any INITRD first. We don't take it into account
 275         * for bootmem setup initially, rely on the end-of-kernel-code
 276         * as our memory range starting point. Once bootmem is inited we
 277         * will reserve the area used for the initrd.
 278         */
 279        init_initrd();
 280
 281        /* Reserve memory occupied by kernel. */
 282        memblock_reserve(__pa_symbol(&_text),
 283                        __pa_symbol(&_end) - __pa_symbol(&_text));
 284
 285        /* max_low_pfn is not a number of pages but the end pfn of low mem */
 286
 287#ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 288        ARCH_PFN_OFFSET = PFN_UP(ramstart);
 289#else
 290        /*
 291         * Reserve any memory between the start of RAM and PHYS_OFFSET
 292         */
 293        if (ramstart > PHYS_OFFSET)
 294                memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
 295
 296        if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
 297                pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 298                        (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
 299                        (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
 300        }
 301#endif
 302
 303        min_low_pfn = ARCH_PFN_OFFSET;
 304        max_pfn = PFN_DOWN(ramend);
 305        for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
 306                /*
 307                 * Skip highmem here so we get an accurate max_low_pfn if low
 308                 * memory stops short of high memory.
 309                 * If the region overlaps HIGHMEM_START, end is clipped so
 310                 * max_pfn excludes the highmem portion.
 311                 */
 312                if (start >= PFN_DOWN(HIGHMEM_START))
 313                        continue;
 314                if (end > PFN_DOWN(HIGHMEM_START))
 315                        end = PFN_DOWN(HIGHMEM_START);
 316                if (end > max_low_pfn)
 317                        max_low_pfn = end;
 318        }
 319
 320        if (min_low_pfn >= max_low_pfn)
 321                panic("Incorrect memory mapping !!!");
 322
 323        if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
 324#ifdef CONFIG_HIGHMEM
 325                highstart_pfn = PFN_DOWN(HIGHMEM_START);
 326                highend_pfn = max_pfn;
 327#else
 328                max_low_pfn = PFN_DOWN(HIGHMEM_START);
 329                max_pfn = max_low_pfn;
 330#endif
 331        }
 332
 333        /*
 334         * Reserve initrd memory if needed.
 335         */
 336        finalize_initrd();
 337}
 338
 339#endif  /* CONFIG_SGI_IP27 */
 340
 341static int usermem __initdata;
 342
 343static int __init early_parse_mem(char *p)
 344{
 345        phys_addr_t start, size;
 346
 347        /*
 348         * If a user specifies memory size, we
 349         * blow away any automatically generated
 350         * size.
 351         */
 352        if (usermem == 0) {
 353                usermem = 1;
 354                memblock_remove(memblock_start_of_DRAM(),
 355                        memblock_end_of_DRAM() - memblock_start_of_DRAM());
 356        }
 357        start = 0;
 358        size = memparse(p, &p);
 359        if (*p == '@')
 360                start = memparse(p + 1, &p);
 361
 362        memblock_add(start, size);
 363
 364        return 0;
 365}
 366early_param("mem", early_parse_mem);
 367
 368static int __init early_parse_memmap(char *p)
 369{
 370        char *oldp;
 371        u64 start_at, mem_size;
 372
 373        if (!p)
 374                return -EINVAL;
 375
 376        if (!strncmp(p, "exactmap", 8)) {
 377                pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 378                return 0;
 379        }
 380
 381        oldp = p;
 382        mem_size = memparse(p, &p);
 383        if (p == oldp)
 384                return -EINVAL;
 385
 386        if (*p == '@') {
 387                start_at = memparse(p+1, &p);
 388                memblock_add(start_at, mem_size);
 389        } else if (*p == '#') {
 390                pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 391                return -EINVAL;
 392        } else if (*p == '$') {
 393                start_at = memparse(p+1, &p);
 394                memblock_add(start_at, mem_size);
 395                memblock_reserve(start_at, mem_size);
 396        } else {
 397                pr_err("\"memmap\" invalid format!\n");
 398                return -EINVAL;
 399        }
 400
 401        if (*p == '\0') {
 402                usermem = 1;
 403                return 0;
 404        } else
 405                return -EINVAL;
 406}
 407early_param("memmap", early_parse_memmap);
 408
 409static void __init mips_reserve_vmcore(void)
 410{
 411#ifdef CONFIG_PROC_VMCORE
 412        phys_addr_t start, end;
 413        u64 i;
 414
 415        if (!elfcorehdr_size) {
 416                for_each_mem_range(i, &start, &end) {
 417                        if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
 418                                /*
 419                                 * Reserve from the elf core header to the end of
 420                                 * the memory segment, that should all be kdump
 421                                 * reserved memory.
 422                                 */
 423                                elfcorehdr_size = end - elfcorehdr_addr;
 424                                break;
 425                        }
 426                }
 427        }
 428
 429        pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
 430                (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
 431
 432        memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
 433#endif
 434}
 435
 436#ifdef CONFIG_KEXEC
 437
 438/* 64M alignment for crash kernel regions */
 439#define CRASH_ALIGN     SZ_64M
 440#define CRASH_ADDR_MAX  SZ_512M
 441
 442static void __init mips_parse_crashkernel(void)
 443{
 444        unsigned long long total_mem;
 445        unsigned long long crash_size, crash_base;
 446        int ret;
 447
 448        total_mem = memblock_phys_mem_size();
 449        ret = parse_crashkernel(boot_command_line, total_mem,
 450                                &crash_size, &crash_base);
 451        if (ret != 0 || crash_size <= 0)
 452                return;
 453
 454        if (crash_base <= 0) {
 455                crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX,
 456                                                        crash_size, CRASH_ALIGN);
 457                if (!crash_base) {
 458                        pr_warn("crashkernel reservation failed - No suitable area found.\n");
 459                        return;
 460                }
 461        } else {
 462                unsigned long long start;
 463
 464                start = memblock_find_in_range(crash_base, crash_base + crash_size,
 465                                                crash_size, 1);
 466                if (start != crash_base) {
 467                        pr_warn("Invalid memory region reserved for crash kernel\n");
 468                        return;
 469                }
 470        }
 471
 472        crashk_res.start = crash_base;
 473        crashk_res.end   = crash_base + crash_size - 1;
 474}
 475
 476static void __init request_crashkernel(struct resource *res)
 477{
 478        int ret;
 479
 480        if (crashk_res.start == crashk_res.end)
 481                return;
 482
 483        ret = request_resource(res, &crashk_res);
 484        if (!ret)
 485                pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 486                        (unsigned long)(resource_size(&crashk_res) >> 20),
 487                        (unsigned long)(crashk_res.start  >> 20));
 488}
 489#else /* !defined(CONFIG_KEXEC)         */
 490static void __init mips_parse_crashkernel(void)
 491{
 492}
 493
 494static void __init request_crashkernel(struct resource *res)
 495{
 496}
 497#endif /* !defined(CONFIG_KEXEC)  */
 498
 499static void __init check_kernel_sections_mem(void)
 500{
 501        phys_addr_t start = __pa_symbol(&_text);
 502        phys_addr_t size = __pa_symbol(&_end) - start;
 503
 504        if (!memblock_is_region_memory(start, size)) {
 505                pr_info("Kernel sections are not in the memory maps\n");
 506                memblock_add(start, size);
 507        }
 508}
 509
 510static void __init bootcmdline_append(const char *s, size_t max)
 511{
 512        if (!s[0] || !max)
 513                return;
 514
 515        if (boot_command_line[0])
 516                strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 517
 518        strlcat(boot_command_line, s, max);
 519}
 520
 521#ifdef CONFIG_OF_EARLY_FLATTREE
 522
 523static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
 524                                          int depth, void *data)
 525{
 526        bool *dt_bootargs = data;
 527        const char *p;
 528        int l;
 529
 530        if (depth != 1 || !data ||
 531            (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
 532                return 0;
 533
 534        p = of_get_flat_dt_prop(node, "bootargs", &l);
 535        if (p != NULL && l > 0) {
 536                bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
 537                *dt_bootargs = true;
 538        }
 539
 540        return 1;
 541}
 542
 543#endif /* CONFIG_OF_EARLY_FLATTREE */
 544
 545static void __init bootcmdline_init(void)
 546{
 547        bool dt_bootargs = false;
 548
 549        /*
 550         * If CMDLINE_OVERRIDE is enabled then initializing the command line is
 551         * trivial - we simply use the built-in command line unconditionally &
 552         * unmodified.
 553         */
 554        if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
 555                strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 556                return;
 557        }
 558
 559        /*
 560         * If the user specified a built-in command line &
 561         * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
 562         * prepended to arguments from the bootloader or DT so we'll copy them
 563         * to the start of boot_command_line here. Otherwise, empty
 564         * boot_command_line to undo anything early_init_dt_scan_chosen() did.
 565         */
 566        if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 567                strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 568        else
 569                boot_command_line[0] = 0;
 570
 571#ifdef CONFIG_OF_EARLY_FLATTREE
 572        /*
 573         * If we're configured to take boot arguments from DT, look for those
 574         * now.
 575         */
 576        if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
 577            IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
 578                of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
 579#endif
 580
 581        /*
 582         * If we didn't get any arguments from DT (regardless of whether that's
 583         * because we weren't configured to look for them, or because we looked
 584         * & found none) then we'll take arguments from the bootloader.
 585         * plat_mem_setup() should have filled arcs_cmdline with arguments from
 586         * the bootloader.
 587         */
 588        if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
 589                bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
 590
 591        /*
 592         * If the user specified a built-in command line & we didn't already
 593         * prepend it, we append it to boot_command_line here.
 594         */
 595        if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
 596            !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 597                bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
 598}
 599
 600/*
 601 * arch_mem_init - initialize memory management subsystem
 602 *
 603 *  o plat_mem_setup() detects the memory configuration and will record detected
 604 *    memory areas using memblock_add.
 605 *
 606 * At this stage the memory configuration of the system is known to the
 607 * kernel but generic memory management system is still entirely uninitialized.
 608 *
 609 *  o bootmem_init()
 610 *  o sparse_init()
 611 *  o paging_init()
 612 *  o dma_contiguous_reserve()
 613 *
 614 * At this stage the bootmem allocator is ready to use.
 615 *
 616 * NOTE: historically plat_mem_setup did the entire platform initialization.
 617 *       This was rather impractical because it meant plat_mem_setup had to
 618 * get away without any kind of memory allocator.  To keep old code from
 619 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 620 * initialization hook for anything else was introduced.
 621 */
 622static void __init arch_mem_init(char **cmdline_p)
 623{
 624        /* call board setup routine */
 625        plat_mem_setup();
 626        memblock_set_bottom_up(true);
 627
 628        bootcmdline_init();
 629        strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 630        *cmdline_p = command_line;
 631
 632        parse_early_param();
 633
 634        if (usermem)
 635                pr_info("User-defined physical RAM map overwrite\n");
 636
 637        check_kernel_sections_mem();
 638
 639        early_init_fdt_reserve_self();
 640        early_init_fdt_scan_reserved_mem();
 641
 642#ifndef CONFIG_NUMA
 643        memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
 644#endif
 645        bootmem_init();
 646
 647        /*
 648         * Prevent memblock from allocating high memory.
 649         * This cannot be done before max_low_pfn is detected, so up
 650         * to this point is possible to only reserve physical memory
 651         * with memblock_reserve; memblock_alloc* can be used
 652         * only after this point
 653         */
 654        memblock_set_current_limit(PFN_PHYS(max_low_pfn));
 655
 656        mips_reserve_vmcore();
 657
 658        mips_parse_crashkernel();
 659#ifdef CONFIG_KEXEC
 660        if (crashk_res.start != crashk_res.end)
 661                memblock_reserve(crashk_res.start, resource_size(&crashk_res));
 662#endif
 663        device_tree_init();
 664
 665        /*
 666         * In order to reduce the possibility of kernel panic when failed to
 667         * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
 668         * low memory as small as possible before plat_swiotlb_setup(), so
 669         * make sparse_init() using top-down allocation.
 670         */
 671        memblock_set_bottom_up(false);
 672        sparse_init();
 673        memblock_set_bottom_up(true);
 674
 675        plat_swiotlb_setup();
 676
 677        dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 678
 679        /* Reserve for hibernation. */
 680        memblock_reserve(__pa_symbol(&__nosave_begin),
 681                __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
 682
 683        early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 684}
 685
 686static void __init resource_init(void)
 687{
 688        phys_addr_t start, end;
 689        u64 i;
 690
 691        if (UNCAC_BASE != IO_BASE)
 692                return;
 693
 694        code_resource.start = __pa_symbol(&_text);
 695        code_resource.end = __pa_symbol(&_etext) - 1;
 696        data_resource.start = __pa_symbol(&_etext);
 697        data_resource.end = __pa_symbol(&_edata) - 1;
 698        bss_resource.start = __pa_symbol(&__bss_start);
 699        bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 700
 701        for_each_mem_range(i, &start, &end) {
 702                struct resource *res;
 703
 704                res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
 705                if (!res)
 706                        panic("%s: Failed to allocate %zu bytes\n", __func__,
 707                              sizeof(struct resource));
 708
 709                res->start = start;
 710                /*
 711                 * In memblock, end points to the first byte after the
 712                 * range while in resourses, end points to the last byte in
 713                 * the range.
 714                 */
 715                res->end = end - 1;
 716                res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 717                res->name = "System RAM";
 718
 719                request_resource(&iomem_resource, res);
 720
 721                /*
 722                 *  We don't know which RAM region contains kernel data,
 723                 *  so we try it repeatedly and let the resource manager
 724                 *  test it.
 725                 */
 726                request_resource(res, &code_resource);
 727                request_resource(res, &data_resource);
 728                request_resource(res, &bss_resource);
 729                request_crashkernel(res);
 730        }
 731}
 732
 733#ifdef CONFIG_SMP
 734static void __init prefill_possible_map(void)
 735{
 736        int i, possible = num_possible_cpus();
 737
 738        if (possible > nr_cpu_ids)
 739                possible = nr_cpu_ids;
 740
 741        for (i = 0; i < possible; i++)
 742                set_cpu_possible(i, true);
 743        for (; i < NR_CPUS; i++)
 744                set_cpu_possible(i, false);
 745
 746        nr_cpu_ids = possible;
 747}
 748#else
 749static inline void prefill_possible_map(void) {}
 750#endif
 751
 752void __init setup_arch(char **cmdline_p)
 753{
 754        cpu_probe();
 755        mips_cm_probe();
 756        prom_init();
 757
 758        setup_early_fdc_console();
 759#ifdef CONFIG_EARLY_PRINTK
 760        setup_early_printk();
 761#endif
 762        cpu_report();
 763        check_bugs_early();
 764
 765#if defined(CONFIG_VT)
 766#if defined(CONFIG_VGA_CONSOLE)
 767        conswitchp = &vga_con;
 768#endif
 769#endif
 770
 771        arch_mem_init(cmdline_p);
 772        dmi_setup();
 773
 774        resource_init();
 775        plat_smp_setup();
 776        prefill_possible_map();
 777
 778        cpu_cache_init();
 779        paging_init();
 780
 781        memblock_dump_all();
 782}
 783
 784unsigned long kernelsp[NR_CPUS];
 785unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 786
 787#ifdef CONFIG_DEBUG_FS
 788struct dentry *mips_debugfs_dir;
 789static int __init debugfs_mips(void)
 790{
 791        mips_debugfs_dir = debugfs_create_dir("mips", NULL);
 792        return 0;
 793}
 794arch_initcall(debugfs_mips);
 795#endif
 796
 797#ifdef CONFIG_DMA_NONCOHERENT
 798static int __init setcoherentio(char *str)
 799{
 800        dma_default_coherent = true;
 801        pr_info("Hardware DMA cache coherency (command line)\n");
 802        return 0;
 803}
 804early_param("coherentio", setcoherentio);
 805
 806static int __init setnocoherentio(char *str)
 807{
 808        dma_default_coherent = true;
 809        pr_info("Software DMA cache coherency (command line)\n");
 810        return 0;
 811}
 812early_param("nocoherentio", setnocoherentio);
 813#endif
 814