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-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/mmzone.h>
  41 #include <asm/sections.h>
  42 #include <asm/setup.h>
  43 #include <asm/smp-ops.h>
  44 #include <asm/prom.h>
  45 #include <asm/fw/fw.h>
  46
  47 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  48 char __section(".appended_dtb") __appended_dtb[0x100000];
  49 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  50
  51 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  52
  53 EXPORT_SYMBOL(cpu_data);
  54
  55 #ifdef CONFIG_VT
  56 struct screen_info screen_info;
  57 #endif
  58
  59 /*
  60  * Setup information
  61  *
  62  * These are initialized so they are in the .data section
  63  */
  64 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  65
  66 EXPORT_SYMBOL(mips_machtype);
  67
  68 static char __initdata command_line[COMMAND_LINE_SIZE];
  69 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  70
  71 #ifdef CONFIG_CMDLINE_BOOL
  72 static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
  73 #else
  74 static const char builtin_cmdline[] __initconst = "";
  75 #endif
  76
  77 /*
  78  * mips_io_port_base is the begin of the address space to which x86 style
  79  * I/O ports are mapped.
  80  */
  81 unsigned long mips_io_port_base = -1;
  82 EXPORT_SYMBOL(mips_io_port_base);
  83
  84 static struct resource code_resource = { .name = "Kernel code", };
  85 static struct resource data_resource = { .name = "Kernel data", };
  86 static struct resource bss_resource = { .name = "Kernel bss", };
  87
  88 unsigned long __kaslr_offset __ro_after_init;
  89 EXPORT_SYMBOL(__kaslr_offset);
  90
  91 static void *detect_magic __initdata = detect_memory_region;
  92
  93 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
  94 unsigned long ARCH_PFN_OFFSET;
  95 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
  96 #endif
  97
  98 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
  99 {
 100         void *dm = &detect_magic;
 101         phys_addr_t size;
 102
 103         for (size = sz_min; size < sz_max; size <<= 1) {
 104                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 105                         break;
 106         }
 107
 108         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 109                 ((unsigned long long) size) / SZ_1M,
 110                 (unsigned long long) start,
 111                 ((unsigned long long) sz_min) / SZ_1M,
 112                 ((unsigned long long) sz_max) / SZ_1M);
 113
 114         memblock_add(start, size);
 115 }
 116
 117 /*
 118  * Manage initrd
 119  */
 120 #ifdef CONFIG_BLK_DEV_INITRD
 121
 122 static int __init rd_start_early(char *p)
 123 {
 124         unsigned long start = memparse(p, &p);
 125
 126 #ifdef CONFIG_64BIT
 127         /* Guess if the sign extension was forgotten by bootloader */
 128         if (start < XKPHYS)
 129                 start = (int)start;
 130 #endif
 131         initrd_start = start;
 132         initrd_end += start;
 133         return 0;
 134 }
 135 early_param("rd_start", rd_start_early);
 136
 137 static int __init rd_size_early(char *p)
 138 {
 139         initrd_end += memparse(p, &p);
 140         return 0;
 141 }
 142 early_param("rd_size", rd_size_early);
 143
 144 /* it returns the next free pfn after initrd */
 145 static unsigned long __init init_initrd(void)
 146 {
 147         unsigned long end;
 148
 149         /*
 150          * Board specific code or command line parser should have
 151          * already set up initrd_start and initrd_end. In these cases
 152          * perfom sanity checks and use them if all looks good.
 153          */
 154         if (!initrd_start || initrd_end <= initrd_start)
 155                 goto disable;
 156
 157         if (initrd_start & ~PAGE_MASK) {
 158                 pr_err("initrd start must be page aligned\n");
 159                 goto disable;
 160         }
 161         if (initrd_start < PAGE_OFFSET) {
 162                 pr_err("initrd start < PAGE_OFFSET\n");
 163                 goto disable;
 164         }
 165
 166         /*
 167          * Sanitize initrd addresses. For example firmware
 168          * can't guess if they need to pass them through
 169          * 64-bits values if the kernel has been built in pure
 170          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 171          * addresses now, so the code can now safely use __pa().
 172          */
 173         end = __pa(initrd_end);
 174         initrd_end = (unsigned long)__va(end);
 175         initrd_start = (unsigned long)__va(__pa(initrd_start));
 176
 177         ROOT_DEV = Root_RAM0;
 178         return PFN_UP(end);
 179 disable:
 180         initrd_start = 0;
 181         initrd_end = 0;
 182         return 0;
 183 }
 184
 185 /* In some conditions (e.g. big endian bootloader with a little endian
 186    kernel), the initrd might appear byte swapped.  Try to detect this and
 187    byte swap it if needed.  */
 188 static void __init maybe_bswap_initrd(void)
 189 {
 190 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 191         u64 buf;
 192
 193         /* Check for CPIO signature */
 194         if (!memcmp((void *)initrd_start, "070701", 6))
 195                 return;
 196
 197         /* Check for compressed initrd */
 198         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 199                 return;
 200
 201         /* Try again with a byte swapped header */
 202         buf = swab64p((u64 *)initrd_start);
 203         if (!memcmp(&buf, "070701", 6) ||
 204             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 205                 unsigned long i;
 206
 207                 pr_info("Byteswapped initrd detected\n");
 208                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 209                         swab64s((u64 *)i);
 210         }
 211 #endif
 212 }
 213
 214 static void __init finalize_initrd(void)
 215 {
 216         unsigned long size = initrd_end - initrd_start;
 217
 218         if (size == 0) {
 219                 printk(KERN_INFO "Initrd not found or empty");
 220                 goto disable;
 221         }
 222         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 223                 printk(KERN_ERR "Initrd extends beyond end of memory");
 224                 goto disable;
 225         }
 226
 227         maybe_bswap_initrd();
 228
 229         memblock_reserve(__pa(initrd_start), size);
 230         initrd_below_start_ok = 1;
 231
 232         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 233                 initrd_start, size);
 234         return;
 235 disable:
 236         printk(KERN_CONT " - disabling initrd\n");
 237         initrd_start = 0;
 238         initrd_end = 0;
 239 }
 240
 241 #else  /* !CONFIG_BLK_DEV_INITRD */
 242
 243 static unsigned long __init init_initrd(void)
 244 {
 245         return 0;
 246 }
 247
 248 #define finalize_initrd()       do {} while (0)
 249
 250 #endif
 251
 252 /*
 253  * Initialize the bootmem allocator. It also setup initrd related data
 254  * if needed.
 255  */
 256 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
 257
 258 static void __init bootmem_init(void)
 259 {
 260         init_initrd();
 261         finalize_initrd();
 262 }
 263
 264 #else  /* !CONFIG_SGI_IP27 */
 265
 266 static void __init bootmem_init(void)
 267 {
 268         phys_addr_t ramstart, ramend;
 269         unsigned long start, end;
 270         int i;
 271
 272         ramstart = memblock_start_of_DRAM();
 273         ramend = memblock_end_of_DRAM();
 274
 275         /*
 276          * Sanity check any INITRD first. We don't take it into account
 277          * for bootmem setup initially, rely on the end-of-kernel-code
 278          * as our memory range starting point. Once bootmem is inited we
 279          * will reserve the area used for the initrd.
 280          */
 281         init_initrd();
 282
 283         /* Reserve memory occupied by kernel. */
 284         memblock_reserve(__pa_symbol(&_text),
 285                         __pa_symbol(&_end) - __pa_symbol(&_text));
 286
 287         /* max_low_pfn is not a number of pages but the end pfn of low mem */
 288
 289 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 290         ARCH_PFN_OFFSET = PFN_UP(ramstart);
 291 #else
 292         /*
 293          * Reserve any memory between the start of RAM and PHYS_OFFSET
 294          */
 295         if (ramstart > PHYS_OFFSET)
 296                 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
 297
 298         if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
 299                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 300                         (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
 301                         (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
 302         }
 303 #endif
 304
 305         min_low_pfn = ARCH_PFN_OFFSET;
 306         max_pfn = PFN_DOWN(ramend);
 307         for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
 308                 /*
 309                  * Skip highmem here so we get an accurate max_low_pfn if low
 310                  * memory stops short of high memory.
 311                  * If the region overlaps HIGHMEM_START, end is clipped so
 312                  * max_pfn excludes the highmem portion.
 313                  */
 314                 if (start >= PFN_DOWN(HIGHMEM_START))
 315                         continue;
 316                 if (end > PFN_DOWN(HIGHMEM_START))
 317                         end = PFN_DOWN(HIGHMEM_START);
 318                 if (end > max_low_pfn)
 319                         max_low_pfn = end;
 320         }
 321
 322         if (min_low_pfn >= max_low_pfn)
 323                 panic("Incorrect memory mapping !!!");
 324
 325         if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
 326 #ifdef CONFIG_HIGHMEM
 327                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 328                 highend_pfn = max_pfn;
 329 #else
 330                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 331                 max_pfn = max_low_pfn;
 332 #endif
 333         }
 334
 335         /*
 336          * Reserve initrd memory if needed.
 337          */
 338         finalize_initrd();
 339 }
 340
 341 #endif  /* CONFIG_SGI_IP27 */
 342
 343 static int usermem __initdata;
 344
 345 static int __init early_parse_mem(char *p)
 346 {
 347         phys_addr_t start, size;
 348
 349         if (!p) {
 350                 pr_err("mem parameter is empty, do nothing\n");
 351                 return -EINVAL;
 352         }
 353
 354         /*
 355          * If a user specifies memory size, we
 356          * blow away any automatically generated
 357          * size.
 358          */
 359         if (usermem == 0) {
 360                 usermem = 1;
 361                 memblock_remove(memblock_start_of_DRAM(),
 362                         memblock_end_of_DRAM() - memblock_start_of_DRAM());
 363         }
 364         start = 0;
 365         size = memparse(p, &p);
 366         if (*p == '@')
 367                 start = memparse(p + 1, &p);
 368
 369         if (IS_ENABLED(CONFIG_NUMA))
 370                 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
 371         else
 372                 memblock_add(start, size);
 373
 374         return 0;
 375 }
 376 early_param("mem", early_parse_mem);
 377
 378 static int __init early_parse_memmap(char *p)
 379 {
 380         char *oldp;
 381         u64 start_at, mem_size;
 382
 383         if (!p)
 384                 return -EINVAL;
 385
 386         if (!strncmp(p, "exactmap", 8)) {
 387                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 388                 return 0;
 389         }
 390
 391         oldp = p;
 392         mem_size = memparse(p, &p);
 393         if (p == oldp)
 394                 return -EINVAL;
 395
 396         if (*p == '@') {
 397                 start_at = memparse(p+1, &p);
 398                 memblock_add(start_at, mem_size);
 399         } else if (*p == '#') {
 400                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 401                 return -EINVAL;
 402         } else if (*p == '$') {
 403                 start_at = memparse(p+1, &p);
 404                 memblock_add(start_at, mem_size);
 405                 memblock_reserve(start_at, mem_size);
 406         } else {
 407                 pr_err("\"memmap\" invalid format!\n");
 408                 return -EINVAL;
 409         }
 410
 411         if (*p == '\0') {
 412                 usermem = 1;
 413                 return 0;
 414         } else
 415                 return -EINVAL;
 416 }
 417 early_param("memmap", early_parse_memmap);
 418
 419 static void __init mips_reserve_vmcore(void)
 420 {
 421 #ifdef CONFIG_PROC_VMCORE
 422         phys_addr_t start, end;
 423         u64 i;
 424
 425         if (!elfcorehdr_size) {
 426                 for_each_mem_range(i, &start, &end) {
 427                         if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
 428                                 /*
 429                                  * Reserve from the elf core header to the end of
 430                                  * the memory segment, that should all be kdump
 431                                  * reserved memory.
 432                                  */
 433                                 elfcorehdr_size = end - elfcorehdr_addr;
 434                                 break;
 435                         }
 436                 }
 437         }
 438
 439         pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
 440                 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
 441
 442         memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
 443 #endif
 444 }
 445
 446 #ifdef CONFIG_KEXEC
 447
 448 /* 64M alignment for crash kernel regions */
 449 #define CRASH_ALIGN     SZ_64M
 450 #define CRASH_ADDR_MAX  SZ_512M
 451
 452 static void __init mips_parse_crashkernel(void)
 453 {
 454         unsigned long long total_mem;
 455         unsigned long long crash_size, crash_base;
 456         int ret;
 457
 458         total_mem = memblock_phys_mem_size();
 459         ret = parse_crashkernel(boot_command_line, total_mem,
 460                                 &crash_size, &crash_base);
 461         if (ret != 0 || crash_size <= 0)
 462                 return;
 463
 464         if (crash_base <= 0) {
 465                 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
 466                                                        CRASH_ALIGN,
 467                                                        CRASH_ADDR_MAX);
 468                 if (!crash_base) {
 469                         pr_warn("crashkernel reservation failed - No suitable area found.\n");
 470                         return;
 471                 }
 472         } else {
 473                 unsigned long long start;
 474
 475                 start = memblock_phys_alloc_range(crash_size, 1,
 476                                                   crash_base,
 477                                                   crash_base + crash_size);
 478                 if (start != crash_base) {
 479                         pr_warn("Invalid memory region reserved for crash kernel\n");
 480                         return;
 481                 }
 482         }
 483
 484         crashk_res.start = crash_base;
 485         crashk_res.end   = crash_base + crash_size - 1;
 486 }
 487
 488 static void __init request_crashkernel(struct resource *res)
 489 {
 490         int ret;
 491
 492         if (crashk_res.start == crashk_res.end)
 493                 return;
 494
 495         ret = request_resource(res, &crashk_res);
 496         if (!ret)
 497                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 498                         (unsigned long)(resource_size(&crashk_res) >> 20),
 499                         (unsigned long)(crashk_res.start  >> 20));
 500 }
 501 #else /* !defined(CONFIG_KEXEC)         */
 502 static void __init mips_parse_crashkernel(void)
 503 {
 504 }
 505
 506 static void __init request_crashkernel(struct resource *res)
 507 {
 508 }
 509 #endif /* !defined(CONFIG_KEXEC)  */
 510
 511 static void __init check_kernel_sections_mem(void)
 512 {
 513         phys_addr_t start = __pa_symbol(&_text);
 514         phys_addr_t size = __pa_symbol(&_end) - start;
 515
 516         if (!memblock_is_region_memory(start, size)) {
 517                 pr_info("Kernel sections are not in the memory maps\n");
 518                 memblock_add(start, size);
 519         }
 520 }
 521
 522 static void __init bootcmdline_append(const char *s, size_t max)
 523 {
 524         if (!s[0] || !max)
 525                 return;
 526
 527         if (boot_command_line[0])
 528                 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 529
 530         strlcat(boot_command_line, s, max);
 531 }
 532
 533 #ifdef CONFIG_OF_EARLY_FLATTREE
 534
 535 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
 536                                           int depth, void *data)
 537 {
 538         bool *dt_bootargs = data;
 539         const char *p;
 540         int l;
 541
 542         if (depth != 1 || !data ||
 543             (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
 544                 return 0;
 545
 546         p = of_get_flat_dt_prop(node, "bootargs", &l);
 547         if (p != NULL && l > 0) {
 548                 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
 549                 *dt_bootargs = true;
 550         }
 551
 552         return 1;
 553 }
 554
 555 #endif /* CONFIG_OF_EARLY_FLATTREE */
 556
 557 static void __init bootcmdline_init(void)
 558 {
 559         bool dt_bootargs = false;
 560
 561         /*
 562          * If CMDLINE_OVERRIDE is enabled then initializing the command line is
 563          * trivial - we simply use the built-in command line unconditionally &
 564          * unmodified.
 565          */
 566         if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
 567                 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 568                 return;
 569         }
 570
 571         /*
 572          * If the user specified a built-in command line &
 573          * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
 574          * prepended to arguments from the bootloader or DT so we'll copy them
 575          * to the start of boot_command_line here. Otherwise, empty
 576          * boot_command_line to undo anything early_init_dt_scan_chosen() did.
 577          */
 578         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 579                 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 580         else
 581                 boot_command_line[0] = 0;
 582
 583 #ifdef CONFIG_OF_EARLY_FLATTREE
 584         /*
 585          * If we're configured to take boot arguments from DT, look for those
 586          * now.
 587          */
 588         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
 589             IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
 590                 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
 591 #endif
 592
 593         /*
 594          * If we didn't get any arguments from DT (regardless of whether that's
 595          * because we weren't configured to look for them, or because we looked
 596          * & found none) then we'll take arguments from the bootloader.
 597          * plat_mem_setup() should have filled arcs_cmdline with arguments from
 598          * the bootloader.
 599          */
 600         if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
 601                 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
 602
 603         /*
 604          * If the user specified a built-in command line & we didn't already
 605          * prepend it, we append it to boot_command_line here.
 606          */
 607         if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
 608             !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
 609                 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
 610 }
 611
 612 /*
 613  * arch_mem_init - initialize memory management subsystem
 614  *
 615  *  o plat_mem_setup() detects the memory configuration and will record detected
 616  *    memory areas using memblock_add.
 617  *
 618  * At this stage the memory configuration of the system is known to the
 619  * kernel but generic memory management system is still entirely uninitialized.
 620  *
 621  *  o bootmem_init()
 622  *  o sparse_init()
 623  *  o paging_init()
 624  *  o dma_contiguous_reserve()
 625  *
 626  * At this stage the bootmem allocator is ready to use.
 627  *
 628  * NOTE: historically plat_mem_setup did the entire platform initialization.
 629  *       This was rather impractical because it meant plat_mem_setup had to
 630  * get away without any kind of memory allocator.  To keep old code from
 631  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 632  * initialization hook for anything else was introduced.
 633  */
 634 static void __init arch_mem_init(char **cmdline_p)
 635 {
 636         /* call board setup routine */
 637         plat_mem_setup();
 638         memblock_set_bottom_up(true);
 639
 640         bootcmdline_init();
 641         strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 642         *cmdline_p = command_line;
 643
 644         parse_early_param();
 645
 646         if (usermem)
 647                 pr_info("User-defined physical RAM map overwrite\n");
 648
 649         check_kernel_sections_mem();
 650
 651         early_init_fdt_reserve_self();
 652         early_init_fdt_scan_reserved_mem();
 653
 654 #ifndef CONFIG_NUMA
 655         memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
 656 #endif
 657         bootmem_init();
 658
 659         /*
 660          * Prevent memblock from allocating high memory.
 661          * This cannot be done before max_low_pfn is detected, so up
 662          * to this point is possible to only reserve physical memory
 663          * with memblock_reserve; memblock_alloc* can be used
 664          * only after this point
 665          */
 666         memblock_set_current_limit(PFN_PHYS(max_low_pfn));
 667
 668         mips_reserve_vmcore();
 669
 670         mips_parse_crashkernel();
 671         device_tree_init();
 672
 673         /*
 674          * In order to reduce the possibility of kernel panic when failed to
 675          * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
 676          * low memory as small as possible before plat_swiotlb_setup(), so
 677          * make sparse_init() using top-down allocation.
 678          */
 679         memblock_set_bottom_up(false);
 680         sparse_init();
 681         memblock_set_bottom_up(true);
 682
 683         plat_swiotlb_setup();
 684
 685         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 686
 687         /* Reserve for hibernation. */
 688         memblock_reserve(__pa_symbol(&__nosave_begin),
 689                 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
 690
 691         early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
 692 }
 693
 694 static void __init resource_init(void)
 695 {
 696         phys_addr_t start, end;
 697         u64 i;
 698
 699         if (UNCAC_BASE != IO_BASE)
 700                 return;
 701
 702         code_resource.start = __pa_symbol(&_text);
 703         code_resource.end = __pa_symbol(&_etext) - 1;
 704         data_resource.start = __pa_symbol(&_etext);
 705         data_resource.end = __pa_symbol(&_edata) - 1;
 706         bss_resource.start = __pa_symbol(&__bss_start);
 707         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 708
 709         for_each_mem_range(i, &start, &end) {
 710                 struct resource *res;
 711
 712                 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
 713                 if (!res)
 714                         panic("%s: Failed to allocate %zu bytes\n", __func__,
 715                               sizeof(struct resource));
 716
 717                 res->start = start;
 718                 /*
 719                  * In memblock, end points to the first byte after the
 720                  * range while in resourses, end points to the last byte in
 721                  * the range.
 722                  */
 723                 res->end = end - 1;
 724                 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
 725                 res->name = "System RAM";
 726
 727                 request_resource(&iomem_resource, res);
 728
 729                 /*
 730                  *  We don't know which RAM region contains kernel data,
 731                  *  so we try it repeatedly and let the resource manager
 732                  *  test it.
 733                  */
 734                 request_resource(res, &code_resource);
 735                 request_resource(res, &data_resource);
 736                 request_resource(res, &bss_resource);
 737                 request_crashkernel(res);
 738         }
 739 }
 740
 741 #ifdef CONFIG_SMP
 742 static void __init prefill_possible_map(void)
 743 {
 744         int i, possible = num_possible_cpus();
 745
 746         if (possible > nr_cpu_ids)
 747                 possible = nr_cpu_ids;
 748
 749         for (i = 0; i < possible; i++)
 750                 set_cpu_possible(i, true);
 751         for (; i < NR_CPUS; i++)
 752                 set_cpu_possible(i, false);
 753
 754         set_nr_cpu_ids(possible);
 755 }
 756 #else
 757 static inline void prefill_possible_map(void) {}
 758 #endif
 759
 760 static void __init setup_rng_seed(void)
 761 {
 762         char *rng_seed_hex = fw_getenv("rngseed");
 763         u8 rng_seed[512];
 764         size_t len;
 765
 766         if (!rng_seed_hex)
 767                 return;
 768
 769         len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2);
 770         if (hex2bin(rng_seed, rng_seed_hex, len))
 771                 return;
 772
 773         add_bootloader_randomness(rng_seed, len);
 774         memzero_explicit(rng_seed, len);
 775         memzero_explicit(rng_seed_hex, len * 2);
 776 }
 777
 778 void __init setup_arch(char **cmdline_p)
 779 {
 780         cpu_probe();
 781         mips_cm_probe();
 782         prom_init();
 783
 784         setup_early_fdc_console();
 785 #ifdef CONFIG_EARLY_PRINTK
 786         setup_early_printk();
 787 #endif
 788         cpu_report();
 789         check_bugs_early();
 790
 791 #if defined(CONFIG_VT)
 792 #if defined(CONFIG_VGA_CONSOLE)
 793         conswitchp = &vga_con;
 794 #endif
 795 #endif
 796
 797         arch_mem_init(cmdline_p);
 798         dmi_setup();
 799
 800         resource_init();
 801         plat_smp_setup();
 802         prefill_possible_map();
 803
 804         cpu_cache_init();
 805         paging_init();
 806
 807         memblock_dump_all();
 808
 809         setup_rng_seed();
 810 }
 811
 812 unsigned long kernelsp[NR_CPUS];
 813 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 814
 815 #ifdef CONFIG_DEBUG_FS
 816 struct dentry *mips_debugfs_dir;
 817 static int __init debugfs_mips(void)
 818 {
 819         mips_debugfs_dir = debugfs_create_dir("mips", NULL);
 820         return 0;
 821 }
 822 arch_initcall(debugfs_mips);
 823 #endif
 824
 825 #ifdef CONFIG_DMA_NONCOHERENT
 826 static int __init setcoherentio(char *str)
 827 {
 828         dma_default_coherent = true;
 829         pr_info("Hardware DMA cache coherency (command line)\n");
 830         return 0;
 831 }
 832 early_param("coherentio", setcoherentio);
 833
 834 static int __init setnocoherentio(char *str)
 835 {
 836         dma_default_coherent = false;
 837         pr_info("Software DMA cache coherency (command line)\n");
 838         return 0;
 839 }
 840 early_param("nocoherentio", setnocoherentio);
 841 #endif