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/cpu.h>
  15 #include <linux/delay.h>
  16 #include <linux/ioport.h>
  17 #include <linux/export.h>
  18 #include <linux/memblock.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-map-ops.h>
  29 #include <linux/decompress/generic.h>
  30 #include <linux/of_fdt.h>
  31 #include <linux/dmi.h>
  32 #include <linux/crash_dump.h>
  33
  34 #include <asm/addrspace.h>
  35 #include <asm/bootinfo.h>
  36 #include <asm/bugs.h>
  37 #include <asm/cache.h>
  38 #include <asm/cdmm.h>
  39 #include <asm/cpu.h>
  40 #include <asm/debug.h>
  41 #include <asm/mmzone.h>
  42 #include <asm/sections.h>
  43 #include <asm/setup.h>
  44 #include <asm/smp-ops.h>
  45 #include <asm/mips-cps.h>
  46 #include <asm/prom.h>
  47 #include <asm/fw/fw.h>
  48
  49 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  50 char __section(".appended_dtb") __appended_dtb[0x100000];
  51 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  52
  53 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  54
  55 EXPORT_SYMBOL(cpu_data);
  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 unsigned long __kaslr_offset __ro_after_init;
  87 EXPORT_SYMBOL(__kaslr_offset);
  88
  89 static void *detect_magic __initdata = detect_memory_region;
  90
  91 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
  92 unsigned long ARCH_PFN_OFFSET;
  93 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
  94 #endif
  95
  96 void __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
 120 static 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 }
 133 early_param("rd_start", rd_start_early);
 134
 135 static int __init rd_size_early(char *p)
 136 {
 137         initrd_end += memparse(p, &p);
 138         return 0;
 139 }
 140 early_param("rd_size", rd_size_early);
 141
 142 /* it returns the next free pfn after initrd */
 143 static 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          * perform 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
 160         /*
 161          * Sanitize initrd addresses. For example firmware
 162          * can't guess if they need to pass them through
 163          * 64-bits values if the kernel has been built in pure
 164          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 165          * addresses now, so the code can now safely use __pa().
 166          */
 167         end = __pa(initrd_end);
 168         initrd_end = (unsigned long)__va(end);
 169         initrd_start = (unsigned long)__va(__pa(initrd_start));
 170
 171         if (initrd_start < PAGE_OFFSET) {
 172                 pr_err("initrd start < PAGE_OFFSET\n");
 173                 goto disable;
 174         }
 175
 176         ROOT_DEV = Root_RAM0;
 177         return PFN_UP(end);
 178 disable:
 179         initrd_start = 0;
 180         initrd_end = 0;
 181         return 0;
 182 }
 183
 184 /* In some conditions (e.g. big endian bootloader with a little endian
 185    kernel), the initrd might appear byte swapped.  Try to detect this and
 186    byte swap it if needed.  */
 187 static void __init maybe_bswap_initrd(void)
 188 {
 189 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 190         u64 buf;
 191
 192         /* Check for CPIO signature */
 193         if (!memcmp((void *)initrd_start, "070701", 6))
 194                 return;
 195
 196         /* Check for compressed initrd */
 197         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 198                 return;
 199
 200         /* Try again with a byte swapped header */
 201         buf = swab64p((u64 *)initrd_start);
 202         if (!memcmp(&buf, "070701", 6) ||
 203             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 204                 unsigned long i;
 205
 206                 pr_info("Byteswapped initrd detected\n");
 207                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 208                         swab64s((u64 *)i);
 209         }
 210 #endif
 211 }
 212
 213 static void __init finalize_initrd(void)
 214 {
 215         unsigned long size = initrd_end - initrd_start;
 216
 217         if (size == 0) {
 218                 printk(KERN_INFO "Initrd not found or empty");
 219                 goto disable;
 220         }
 221         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 222                 printk(KERN_ERR "Initrd extends beyond end of memory");
 223                 goto disable;
 224         }
 225
 226         maybe_bswap_initrd();
 227
 228         memblock_reserve(__pa(initrd_start), size);
 229         initrd_below_start_ok = 1;
 230
 231         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 232                 initrd_start, size);
 233         return;
 234 disable:
 235         printk(KERN_CONT " - disabling initrd\n");
 236         initrd_start = 0;
 237         initrd_end = 0;
 238 }
 239
 240 #else  /* !CONFIG_BLK_DEV_INITRD */
 241
 242 static unsigned long __init init_initrd(void)
 243 {
 244         return 0;
 245 }
 246
 247 #define finalize_initrd()       do {} while (0)
 248
 249 #endif
 250
 251 /*
 252  * Initialize the bootmem allocator. It also setup initrd related data
 253  * if needed.
 254  */
 255 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
 256
 257 static void __init bootmem_init(void)
 258 {
 259         init_initrd();
 260         finalize_initrd();
 261 }
 262
 263 #else  /* !CONFIG_SGI_IP27 */
 264
 265 static void __init bootmem_init(void)
 266 {
 267         phys_addr_t ramstart, ramend;
 268         unsigned long start, end;
 269         int i;
 270
 271         ramstart = memblock_start_of_DRAM();
 272         ramend = memblock_end_of_DRAM();
 273
 274         /*
 275          * Sanity check any INITRD first. We don't take it into account
 276          * for bootmem setup initially, rely on the end-of-kernel-code
 277          * as our memory range starting point. Once bootmem is inited we
 278          * will reserve the area used for the initrd.
 279          */
 280         init_initrd();
 281
 282         /* Reserve memory occupied by kernel. */
 283         memblock_reserve(__pa_symbol(&_text),
 284                         __pa_symbol(&_end) - __pa_symbol(&_text));
 285
 286         /* max_low_pfn is not a number of pages but the end pfn of low mem */
 287
 288 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 289         ARCH_PFN_OFFSET = PFN_UP(ramstart);
 290 #else
 291         /*
 292          * Reserve any memory between the start of RAM and PHYS_OFFSET
 293          */
 294         if (ramstart > PHYS_OFFSET)
 295                 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
 296
 297         if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
 298                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 299                         (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
 300                         (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
 301         }
 302 #endif
 303
 304         min_low_pfn = ARCH_PFN_OFFSET;
 305         max_pfn = PFN_DOWN(ramend);
 306         for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
 307                 /*
 308                  * Skip highmem here so we get an accurate max_low_pfn if low
 309                  * memory stops short of high memory.
 310                  * If the region overlaps HIGHMEM_START, end is clipped so
 311                  * max_pfn excludes the highmem portion.
 312                  */
 313                 if (start >= PFN_DOWN(HIGHMEM_START))
 314                         continue;
 315                 if (end > PFN_DOWN(HIGHMEM_START))
 316                         end = PFN_DOWN(HIGHMEM_START);
 317                 if (end > max_low_pfn)
 318                         max_low_pfn = end;
 319         }
 320
 321         if (min_low_pfn >= max_low_pfn)
 322                 panic("Incorrect memory mapping !!!");
 323
 324         if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
 325                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 326 #ifdef CONFIG_HIGHMEM
 327                 highstart_pfn = max_low_pfn;
 328                 highend_pfn = max_pfn;
 329 #else
 330                 max_pfn = max_low_pfn;
 331 #endif
 332         }
 333
 334         /*
 335          * Reserve initrd memory if needed.
 336          */
 337         finalize_initrd();
 338 }
 339
 340 #endif  /* CONFIG_SGI_IP27 */
 341
 342 static int usermem __initdata;
 343
 344 static int __init early_parse_mem(char *p)
 345 {
 346         phys_addr_t start, size;
 347
 348         if (!p) {
 349                 pr_err("mem parameter is empty, do nothing\n");
 350                 return -EINVAL;
 351         }
 352
 353         /*
 354          * If a user specifies memory size, we
 355          * blow away any automatically generated
 356          * size.
 357          */
 358         if (usermem == 0) {
 359                 usermem = 1;
 360                 memblock_remove(memblock_start_of_DRAM(),
 361                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
 362         }
 363         start = 0;
 364         size = memparse(p, &p);
 365         if (*p == '@')
 366                 start = memparse(p + 1, &p);
 367
 368         if (IS_ENABLED(CONFIG_NUMA))
 369                 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
 370         else
 371                 memblock_add(start, size);
 372
 373         return 0;
 374 }
 375 early_param("mem", early_parse_mem);
 376
 377 static int __init early_parse_memmap(char *p)
 378 {
 379         char *oldp;
 380         u64 start_at, mem_size;
 381
 382         if (!p)
 383                 return -EINVAL;
 384
 385         if (!strncmp(p, "exactmap", 8)) {
 386                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 387                 return 0;
 388         }
 389
 390         oldp = p;
 391         mem_size = memparse(p, &p);
 392         if (p == oldp)
 393                 return -EINVAL;
 394
 395         if (*p == '@') {
 396                 start_at = memparse(p+1, &p);
 397                 memblock_add(start_at, mem_size);
 398         } else if (*p == '#') {
 399                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 400                 return -EINVAL;
 401         } else if (*p == '$') {
 402                 start_at = memparse(p+1, &p);
 403                 memblock_add(start_at, mem_size);
 404                 memblock_reserve(start_at, mem_size);
 405         } else {
 406                 pr_err("\"memmap\" invalid format!\n");
 407                 return -EINVAL;
 408         }
 409
 410         if (*p == '\0') {
 411                 usermem = 1;
 412                 return 0;
 413         } else
 414                 return -EINVAL;
 415 }
 416 early_param("memmap", early_parse_memmap);
 417
 418 static void __init mips_reserve_vmcore(void)
 419 {
 420 #ifdef CONFIG_PROC_VMCORE
 421         phys_addr_t start, end;
 422         u64 i;
 423
 424         if (!elfcorehdr_size) {
 425                 for_each_mem_range(i, &start, &end) {
 426                         if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
 427                                 /*
 428                                  * Reserve from the elf core header to the end of
 429                                  * the memory segment, that should all be kdump
 430                                  * reserved memory.
 431                                  */
 432                                 elfcorehdr_size = end - elfcorehdr_addr;
 433                                 break;
 434                         }
 435                 }
 436         }
 437
 438         pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
 439                 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
 440
 441         memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
 442 #endif
 443 }
 444
 445 /* 64M alignment for crash kernel regions */
 446 #define CRASH_ALIGN     SZ_64M
 447 #define CRASH_ADDR_MAX  SZ_512M
 448
 449 static void __init mips_parse_crashkernel(void)
 450 {
 451         unsigned long long total_mem;
 452         unsigned long long crash_size, crash_base;
 453         int ret;
 454
 455         if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
 456                 return;
 457
 458         total_mem = memblock_phys_mem_size();
 459         ret = parse_crashkernel(boot_command_line, total_mem,
 460                                 &crash_size, &crash_base,
 461                                 NULL, NULL);
 462         if (ret != 0 || crash_size <= 0)
 463                 return;
 464
 465         if (crash_base <= 0) {
 466                 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
 467                                                        CRASH_ALIGN,
 468                                                        CRASH_ADDR_MAX);
 469                 if (!crash_base) {
 470                         pr_warn("crashkernel reservation failed - No suitable area found.\n");
 471                         return;
 472                 }
 473         } else {
 474                 unsigned long long start;
 475
 476                 start = memblock_phys_alloc_range(crash_size, 1,
 477                                                   crash_base,
 478                                                   crash_base + crash_size);
 479                 if (start != crash_base) {
 480                         pr_warn("Invalid memory region reserved for crash kernel\n");
 481                         return;
 482                 }
 483         }
 484
 485         crashk_res.start = crash_base;
 486         crashk_res.end   = crash_base + crash_size - 1;
 487 }
 488
 489 static void __init request_crashkernel(struct resource *res)
 490 {
 491         int ret;
 492
 493         if (!IS_ENABLED(CONFIG_CRASH_RESERVE))
 494                 return;
 495
 496         if (crashk_res.start == crashk_res.end)
 497                 return;
 498
 499         ret = request_resource(res, &crashk_res);
 500         if (!ret)
 501                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 502                         (unsigned long)(resource_size(&crashk_res) >> 20),
 503                         (unsigned long)(crashk_res.start  >> 20));
 504 }
 505
 506 static void __init check_kernel_sections_mem(void)
 507 {
 508         phys_addr_t start = __pa_symbol(&_text);
 509         phys_addr_t size = __pa_symbol(&_end) - start;
 510
 511         if (!memblock_is_region_memory(start, size)) {
 512                 pr_info("Kernel sections are not in the memory maps\n");
 513                 memblock_add(start, size);
 514         }
 515 }
 516
 517 static void __init bootcmdline_append(const char *s, size_t max)
 518 {
 519         if (!s[0] || !max)
 520                 return;
 521
 522         if (boot_command_line[0])
 523                 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 524
 525         strlcat(boot_command_line, s, max);
 526 }
 527
 528 #ifdef CONFIG_OF_EARLY_FLATTREE
 529
 530 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
 531                                           int depth, void *data)
 532 {
 533         bool *dt_bootargs = data;
 534         const char *p;
 535         int l;
 536
 537         if (depth != 1 || !data ||
 538             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
 539                 return 0;
 540
 541         p = of_get_flat_dt_prop(node, "bootargs", &l);
 542         if (p != NULL && l > 0) {
 543                 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
 544                 *dt_bootargs = true;
 545         }
 546
 547         return 1;
 548 }
 549
 550 #endif /* CONFIG_OF_EARLY_FLATTREE */
 551
 552 static void __init bootcmdline_init(void)
 553 {
 554         bool dt_bootargs = false;
 555
 556         /*
 557          * If CMDLINE_OVERRIDE is enabled then initializing the command line is
 558          * trivial - we simply use the built-in command line unconditionally &
 559          * unmodified.
 560          */
 561         if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
 562                 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 563                 return;
 564         }
 565
 566         /*
 567          * If the user specified a built-in command line &
 568          * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
 569          * prepended to arguments from the bootloader or DT so we'll copy them
 570          * to the start of boot_command_line here. Otherwise, empty
 571          * boot_command_line to undo anything early_init_dt_scan_chosen() did.
 572          */
 573         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 574                 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 575         else
 576                 boot_command_line[0] = 0;
 577
 578 #ifdef CONFIG_OF_EARLY_FLATTREE
 579         /*
 580          * If we're configured to take boot arguments from DT, look for those
 581          * now.
 582          */
 583         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
 584             IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
 585                 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
 586 #endif
 587
 588         /*
 589          * If we didn't get any arguments from DT (regardless of whether that's
 590          * because we weren't configured to look for them, or because we looked
 591          * & found none) then we'll take arguments from the bootloader.
 592          * plat_mem_setup() should have filled arcs_cmdline with arguments from
 593          * the bootloader.
 594          */
 595         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
 596                 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
 597
 598         /*
 599          * If the user specified a built-in command line & we didn't already
 600          * prepend it, we append it to boot_command_line here.
 601          */
 602         if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
 603             !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 604                 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
 605 }
 606
 607 /*
 608  * arch_mem_init - initialize memory management subsystem
 609  *
 610  *  o plat_mem_setup() detects the memory configuration and will record detected
 611  *    memory areas using memblock_add.
 612  *
 613  * At this stage the memory configuration of the system is known to the
 614  * kernel but generic memory management system is still entirely uninitialized.
 615  *
 616  *  o bootmem_init()
 617  *  o sparse_init()
 618  *  o paging_init()
 619  *  o dma_contiguous_reserve()
 620  *
 621  * At this stage the bootmem allocator is ready to use.
 622  *
 623  * NOTE: historically plat_mem_setup did the entire platform initialization.
 624  *       This was rather impractical because it meant plat_mem_setup had to
 625  * get away without any kind of memory allocator.  To keep old code from
 626  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 627  * initialization hook for anything else was introduced.
 628  */
 629 static void __init arch_mem_init(char **cmdline_p)
 630 {
 631         /* call board setup routine */
 632         plat_mem_setup();
 633         memblock_set_bottom_up(true);
 634
 635         bootcmdline_init();
 636         strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 637         *cmdline_p = command_line;
 638
 639         parse_early_param();
 640
 641         if (usermem)
 642                 pr_info("User-defined physical RAM map overwrite\n");
 643
 644         check_kernel_sections_mem();
 645
 646         early_init_fdt_reserve_self();
 647         early_init_fdt_scan_reserved_mem();
 648
 649 #ifndef CONFIG_NUMA
 650         memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
 651 #endif
 652         bootmem_init();
 653
 654         /*
 655          * Prevent memblock from allocating high memory.
 656          * This cannot be done before max_low_pfn is detected, so up
 657          * to this point is possible to only reserve physical memory
 658          * with memblock_reserve; memblock_alloc* can be used
 659          * only after this point
 660          */
 661         memblock_set_current_limit(PFN_PHYS(max_low_pfn));
 662
 663         mips_reserve_vmcore();
 664
 665         mips_parse_crashkernel();
 666         device_tree_init();
 667
 668         /*
 669          * In order to reduce the possibility of kernel panic when failed to
 670          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
 671          * low memory as small as possible before plat_swiotlb_setup(), so
 672          * make sparse_init() using top-down allocation.
 673          */
 674         memblock_set_bottom_up(false);
 675         sparse_init();
 676         memblock_set_bottom_up(true);
 677
 678         plat_swiotlb_setup();
 679
 680         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 681
 682         /* Reserve for hibernation. */
 683         memblock_reserve(__pa_symbol(&__nosave_begin),
 684                 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
 685
 686         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 687 }
 688
 689 static void __init resource_init(void)
 690 {
 691         phys_addr_t start, end;
 692         u64 i;
 693
 694         if (UNCAC_BASE != IO_BASE)
 695                 return;
 696
 697         code_resource.start = __pa_symbol(&_text);
 698         code_resource.end = __pa_symbol(&_etext) - 1;
 699         data_resource.start = __pa_symbol(&_etext);
 700         data_resource.end = __pa_symbol(&_edata) - 1;
 701         bss_resource.start = __pa_symbol(&__bss_start);
 702         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 703
 704         for_each_mem_range(i, &start, &end) {
 705                 struct resource *res;
 706
 707                 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
 708                 if (!res)
 709                         panic("%s: Failed to allocate %zu bytes\n", __func__,
 710                               sizeof(struct resource));
 711
 712                 res->start = start;
 713                 /*
 714                  * In memblock, end points to the first byte after the
 715                  * range while in resourses, end points to the last byte in
 716                  * the range.
 717                  */
 718                 res->end = end - 1;
 719                 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 720                 res->name = "System RAM";
 721
 722                 request_resource(&iomem_resource, res);
 723
 724                 /*
 725                  *  We don't know which RAM region contains kernel data,
 726                  *  so we try it repeatedly and let the resource manager
 727                  *  test it.
 728                  */
 729                 request_resource(res, &code_resource);
 730                 request_resource(res, &data_resource);
 731                 request_resource(res, &bss_resource);
 732                 request_crashkernel(res);
 733         }
 734 }
 735
 736 #ifdef CONFIG_SMP
 737 static void __init prefill_possible_map(void)
 738 {
 739         int i, possible = num_possible_cpus();
 740
 741         if (possible > nr_cpu_ids)
 742                 possible = nr_cpu_ids;
 743
 744         for (i = 0; i < possible; i++)
 745                 set_cpu_possible(i, true);
 746         for (; i < NR_CPUS; i++)
 747                 set_cpu_possible(i, false);
 748
 749         set_nr_cpu_ids(possible);
 750 }
 751 #else
 752 static inline void prefill_possible_map(void) {}
 753 #endif
 754
 755 static void __init setup_rng_seed(void)
 756 {
 757         char *rng_seed_hex = fw_getenv("rngseed");
 758         u8 rng_seed[512];
 759         size_t len;
 760
 761         if (!rng_seed_hex)
 762                 return;
 763
 764         len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2);
 765         if (hex2bin(rng_seed, rng_seed_hex, len))
 766                 return;
 767
 768         add_bootloader_randomness(rng_seed, len);
 769         memzero_explicit(rng_seed, len);
 770         memzero_explicit(rng_seed_hex, len * 2);
 771 }
 772
 773 void __init setup_arch(char **cmdline_p)
 774 {
 775         cpu_probe();
 776         mips_cm_probe();
 777         prom_init();
 778
 779         setup_early_fdc_console();
 780 #ifdef CONFIG_EARLY_PRINTK
 781         setup_early_printk();
 782 #endif
 783         cpu_report();
 784         if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
 785                 check_bugs64_early();
 786
 787         arch_mem_init(cmdline_p);
 788         dmi_setup();
 789
 790         resource_init();
 791         plat_smp_setup();
 792         prefill_possible_map();
 793
 794         cpu_cache_init();
 795         paging_init();
 796
 797         memblock_dump_all();
 798
 799         setup_rng_seed();
 800 }
 801
 802 unsigned long kernelsp[NR_CPUS];
 803 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 804
 805 #ifdef CONFIG_DEBUG_FS
 806 struct dentry *mips_debugfs_dir;
 807 static int __init debugfs_mips(void)
 808 {
 809         mips_debugfs_dir = debugfs_create_dir("mips", NULL);
 810         return 0;
 811 }
 812 arch_initcall(debugfs_mips);
 813 #endif
 814
 815 #ifdef CONFIG_DMA_NONCOHERENT
 816 static int __init setcoherentio(char *str)
 817 {
 818         dma_default_coherent = true;
 819         pr_info("Hardware DMA cache coherency (command line)\n");
 820         return 0;
 821 }
 822 early_param("coherentio", setcoherentio);
 823
 824 static int __init setnocoherentio(char *str)
 825 {
 826         dma_default_coherent = false;
 827         pr_info("Software DMA cache coherency (command line)\n");
 828         return 0;
 829 }
 830 early_param("nocoherentio", setnocoherentio);
 831 #endif
 832
 833 void __init arch_cpu_finalize_init(void)
 834 {
 835         unsigned int cpu = smp_processor_id();
 836
 837         cpu_data[cpu].udelay_val = loops_per_jiffy;
 838         check_bugs32();
 839
 840         if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
 841                 check_bugs64();
 842 }