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/bootmem.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-contiguous.h>
  29 #include <linux/decompress/generic.h>
  30
  31 #include <asm/addrspace.h>
  32 #include <asm/bootinfo.h>
  33 #include <asm/bugs.h>
  34 #include <asm/cache.h>
  35 #include <asm/cdmm.h>
  36 #include <asm/cpu.h>
  37 #include <asm/debug.h>
  38 #include <asm/sections.h>
  39 #include <asm/setup.h>
  40 #include <asm/smp-ops.h>
  41 #include <asm/prom.h>
  42
  43 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  44 const char __section(.appended_dtb) __appended_dtb[0x100000];
  45 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  46
  47 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  48
  49 EXPORT_SYMBOL(cpu_data);
  50
  51 #ifdef CONFIG_VT
  52 struct screen_info screen_info;
  53 #endif
  54
  55 /*
  56  * Setup information
  57  *
  58  * These are initialized so they are in the .data section
  59  */
  60 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  61
  62 EXPORT_SYMBOL(mips_machtype);
  63
  64 struct boot_mem_map boot_mem_map;
  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 char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  71 #endif
  72
  73 /*
  74  * mips_io_port_base is the begin of the address space to which x86 style
  75  * I/O ports are mapped.
  76  */
  77 const unsigned long mips_io_port_base = -1;
  78 EXPORT_SYMBOL(mips_io_port_base);
  79
  80 static struct resource code_resource = { .name = "Kernel code", };
  81 static struct resource data_resource = { .name = "Kernel data", };
  82
  83 static void *detect_magic __initdata = detect_memory_region;
  84
  85 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
  86 {
  87         int x = boot_mem_map.nr_map;
  88         int i;
  89
  90         /*
  91          * If the region reaches the top of the physical address space, adjust
  92          * the size slightly so that (start + size) doesn't overflow
  93          */
  94         if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
  95                 --size;
  96
  97         /* Sanity check */
  98         if (start + size < start) {
  99                 pr_warn("Trying to add an invalid memory region, skipped\n");
 100                 return;
 101         }
 102
 103         /*
 104          * Try to merge with existing entry, if any.
 105          */
 106         for (i = 0; i < boot_mem_map.nr_map; i++) {
 107                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
 108                 unsigned long top;
 109
 110                 if (entry->type != type)
 111                         continue;
 112
 113                 if (start + size < entry->addr)
 114                         continue;                       /* no overlap */
 115
 116                 if (entry->addr + entry->size < start)
 117                         continue;                       /* no overlap */
 118
 119                 top = max(entry->addr + entry->size, start + size);
 120                 entry->addr = min(entry->addr, start);
 121                 entry->size = top - entry->addr;
 122
 123                 return;
 124         }
 125
 126         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 127                 pr_err("Ooops! Too many entries in the memory map!\n");
 128                 return;
 129         }
 130
 131         boot_mem_map.map[x].addr = start;
 132         boot_mem_map.map[x].size = size;
 133         boot_mem_map.map[x].type = type;
 134         boot_mem_map.nr_map++;
 135 }
 136
 137 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
 138 {
 139         void *dm = &detect_magic;
 140         phys_addr_t size;
 141
 142         for (size = sz_min; size < sz_max; size <<= 1) {
 143                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 144                         break;
 145         }
 146
 147         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 148                 ((unsigned long long) size) / SZ_1M,
 149                 (unsigned long long) start,
 150                 ((unsigned long long) sz_min) / SZ_1M,
 151                 ((unsigned long long) sz_max) / SZ_1M);
 152
 153         add_memory_region(start, size, BOOT_MEM_RAM);
 154 }
 155
 156 static void __init print_memory_map(void)
 157 {
 158         int i;
 159         const int field = 2 * sizeof(unsigned long);
 160
 161         for (i = 0; i < boot_mem_map.nr_map; i++) {
 162                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 163                        field, (unsigned long long) boot_mem_map.map[i].size,
 164                        field, (unsigned long long) boot_mem_map.map[i].addr);
 165
 166                 switch (boot_mem_map.map[i].type) {
 167                 case BOOT_MEM_RAM:
 168                         printk(KERN_CONT "(usable)\n");
 169                         break;
 170                 case BOOT_MEM_INIT_RAM:
 171                         printk(KERN_CONT "(usable after init)\n");
 172                         break;
 173                 case BOOT_MEM_ROM_DATA:
 174                         printk(KERN_CONT "(ROM data)\n");
 175                         break;
 176                 case BOOT_MEM_RESERVED:
 177                         printk(KERN_CONT "(reserved)\n");
 178                         break;
 179                 default:
 180                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 181                         break;
 182                 }
 183         }
 184 }
 185
 186 /*
 187  * Manage initrd
 188  */
 189 #ifdef CONFIG_BLK_DEV_INITRD
 190
 191 static int __init rd_start_early(char *p)
 192 {
 193         unsigned long start = memparse(p, &p);
 194
 195 #ifdef CONFIG_64BIT
 196         /* Guess if the sign extension was forgotten by bootloader */
 197         if (start < XKPHYS)
 198                 start = (int)start;
 199 #endif
 200         initrd_start = start;
 201         initrd_end += start;
 202         return 0;
 203 }
 204 early_param("rd_start", rd_start_early);
 205
 206 static int __init rd_size_early(char *p)
 207 {
 208         initrd_end += memparse(p, &p);
 209         return 0;
 210 }
 211 early_param("rd_size", rd_size_early);
 212
 213 /* it returns the next free pfn after initrd */
 214 static unsigned long __init init_initrd(void)
 215 {
 216         unsigned long end;
 217
 218         /*
 219          * Board specific code or command line parser should have
 220          * already set up initrd_start and initrd_end. In these cases
 221          * perfom sanity checks and use them if all looks good.
 222          */
 223         if (!initrd_start || initrd_end <= initrd_start)
 224                 goto disable;
 225
 226         if (initrd_start & ~PAGE_MASK) {
 227                 pr_err("initrd start must be page aligned\n");
 228                 goto disable;
 229         }
 230         if (initrd_start < PAGE_OFFSET) {
 231                 pr_err("initrd start < PAGE_OFFSET\n");
 232                 goto disable;
 233         }
 234
 235         /*
 236          * Sanitize initrd addresses. For example firmware
 237          * can't guess if they need to pass them through
 238          * 64-bits values if the kernel has been built in pure
 239          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 240          * addresses now, so the code can now safely use __pa().
 241          */
 242         end = __pa(initrd_end);
 243         initrd_end = (unsigned long)__va(end);
 244         initrd_start = (unsigned long)__va(__pa(initrd_start));
 245
 246         ROOT_DEV = Root_RAM0;
 247         return PFN_UP(end);
 248 disable:
 249         initrd_start = 0;
 250         initrd_end = 0;
 251         return 0;
 252 }
 253
 254 /* In some conditions (e.g. big endian bootloader with a little endian
 255    kernel), the initrd might appear byte swapped.  Try to detect this and
 256    byte swap it if needed.  */
 257 static void __init maybe_bswap_initrd(void)
 258 {
 259 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 260         u64 buf;
 261
 262         /* Check for CPIO signature */
 263         if (!memcmp((void *)initrd_start, "070701", 6))
 264                 return;
 265
 266         /* Check for compressed initrd */
 267         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 268                 return;
 269
 270         /* Try again with a byte swapped header */
 271         buf = swab64p((u64 *)initrd_start);
 272         if (!memcmp(&buf, "070701", 6) ||
 273             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 274                 unsigned long i;
 275
 276                 pr_info("Byteswapped initrd detected\n");
 277                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 278                         swab64s((u64 *)i);
 279         }
 280 #endif
 281 }
 282
 283 static void __init finalize_initrd(void)
 284 {
 285         unsigned long size = initrd_end - initrd_start;
 286
 287         if (size == 0) {
 288                 printk(KERN_INFO "Initrd not found or empty");
 289                 goto disable;
 290         }
 291         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 292                 printk(KERN_ERR "Initrd extends beyond end of memory");
 293                 goto disable;
 294         }
 295
 296         maybe_bswap_initrd();
 297
 298         reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
 299         initrd_below_start_ok = 1;
 300
 301         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 302                 initrd_start, size);
 303         return;
 304 disable:
 305         printk(KERN_CONT " - disabling initrd\n");
 306         initrd_start = 0;
 307         initrd_end = 0;
 308 }
 309
 310 #else  /* !CONFIG_BLK_DEV_INITRD */
 311
 312 static unsigned long __init init_initrd(void)
 313 {
 314         return 0;
 315 }
 316
 317 #define finalize_initrd()       do {} while (0)
 318
 319 #endif
 320
 321 /*
 322  * Initialize the bootmem allocator. It also setup initrd related data
 323  * if needed.
 324  */
 325 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
 326
 327 static void __init bootmem_init(void)
 328 {
 329         init_initrd();
 330         finalize_initrd();
 331 }
 332
 333 #else  /* !CONFIG_SGI_IP27 */
 334
 335 static void __init bootmem_init(void)
 336 {
 337         unsigned long reserved_end;
 338         unsigned long mapstart = ~0UL;
 339         unsigned long bootmap_size;
 340         int i;
 341
 342         /*
 343          * Sanity check any INITRD first. We don't take it into account
 344          * for bootmem setup initially, rely on the end-of-kernel-code
 345          * as our memory range starting point. Once bootmem is inited we
 346          * will reserve the area used for the initrd.
 347          */
 348         init_initrd();
 349         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 350
 351         /*
 352          * max_low_pfn is not a number of pages. The number of pages
 353          * of the system is given by 'max_low_pfn - min_low_pfn'.
 354          */
 355         min_low_pfn = ~0UL;
 356         max_low_pfn = 0;
 357
 358         /*
 359          * Find the highest page frame number we have available.
 360          */
 361         for (i = 0; i < boot_mem_map.nr_map; i++) {
 362                 unsigned long start, end;
 363
 364                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 365                         continue;
 366
 367                 start = PFN_UP(boot_mem_map.map[i].addr);
 368                 end = PFN_DOWN(boot_mem_map.map[i].addr
 369                                 + boot_mem_map.map[i].size);
 370
 371                 if (end > max_low_pfn)
 372                         max_low_pfn = end;
 373                 if (start < min_low_pfn)
 374                         min_low_pfn = start;
 375                 if (end <= reserved_end)
 376                         continue;
 377 #ifdef CONFIG_BLK_DEV_INITRD
 378                 /* Skip zones before initrd and initrd itself */
 379                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
 380                         continue;
 381 #endif
 382                 if (start >= mapstart)
 383                         continue;
 384                 mapstart = max(reserved_end, start);
 385         }
 386
 387         if (min_low_pfn >= max_low_pfn)
 388                 panic("Incorrect memory mapping !!!");
 389         if (min_low_pfn > ARCH_PFN_OFFSET) {
 390                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 391                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 392                         min_low_pfn - ARCH_PFN_OFFSET);
 393         } else if (min_low_pfn < ARCH_PFN_OFFSET) {
 394                 pr_info("%lu free pages won't be used\n",
 395                         ARCH_PFN_OFFSET - min_low_pfn);
 396         }
 397         min_low_pfn = ARCH_PFN_OFFSET;
 398
 399         /*
 400          * Determine low and high memory ranges
 401          */
 402         max_pfn = max_low_pfn;
 403         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 404 #ifdef CONFIG_HIGHMEM
 405                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 406                 highend_pfn = max_low_pfn;
 407 #endif
 408                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 409         }
 410
 411 #ifdef CONFIG_BLK_DEV_INITRD
 412         /*
 413          * mapstart should be after initrd_end
 414          */
 415         if (initrd_end)
 416                 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
 417 #endif
 418
 419         /*
 420          * Initialize the boot-time allocator with low memory only.
 421          */
 422         bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
 423                                          min_low_pfn, max_low_pfn);
 424
 425
 426         for (i = 0; i < boot_mem_map.nr_map; i++) {
 427                 unsigned long start, end;
 428
 429                 start = PFN_UP(boot_mem_map.map[i].addr);
 430                 end = PFN_DOWN(boot_mem_map.map[i].addr
 431                                 + boot_mem_map.map[i].size);
 432
 433                 if (start <= min_low_pfn)
 434                         start = min_low_pfn;
 435                 if (start >= end)
 436                         continue;
 437
 438 #ifndef CONFIG_HIGHMEM
 439                 if (end > max_low_pfn)
 440                         end = max_low_pfn;
 441
 442                 /*
 443                  * ... finally, is the area going away?
 444                  */
 445                 if (end <= start)
 446                         continue;
 447 #endif
 448
 449                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 450         }
 451
 452         /*
 453          * Register fully available low RAM pages with the bootmem allocator.
 454          */
 455         for (i = 0; i < boot_mem_map.nr_map; i++) {
 456                 unsigned long start, end, size;
 457
 458                 start = PFN_UP(boot_mem_map.map[i].addr);
 459                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 460                                     + boot_mem_map.map[i].size);
 461
 462                 /*
 463                  * Reserve usable memory.
 464                  */
 465                 switch (boot_mem_map.map[i].type) {
 466                 case BOOT_MEM_RAM:
 467                         break;
 468                 case BOOT_MEM_INIT_RAM:
 469                         memory_present(0, start, end);
 470                         continue;
 471                 default:
 472                         /* Not usable memory */
 473                         continue;
 474                 }
 475
 476                 /*
 477                  * We are rounding up the start address of usable memory
 478                  * and at the end of the usable range downwards.
 479                  */
 480                 if (start >= max_low_pfn)
 481                         continue;
 482                 if (start < reserved_end)
 483                         start = reserved_end;
 484                 if (end > max_low_pfn)
 485                         end = max_low_pfn;
 486
 487                 /*
 488                  * ... finally, is the area going away?
 489                  */
 490                 if (end <= start)
 491                         continue;
 492                 size = end - start;
 493
 494                 /* Register lowmem ranges */
 495                 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
 496                 memory_present(0, start, end);
 497         }
 498
 499         /*
 500          * Reserve the bootmap memory.
 501          */
 502         reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
 503
 504 #ifdef CONFIG_RELOCATABLE
 505         /*
 506          * The kernel reserves all memory below its _end symbol as bootmem,
 507          * but the kernel may now be at a much higher address. The memory
 508          * between the original and new locations may be returned to the system.
 509          */
 510         if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
 511                 unsigned long offset;
 512                 extern void show_kernel_relocation(const char *level);
 513
 514                 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
 515                 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
 516
 517 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
 518                 /*
 519                  * This information is necessary when debugging the kernel
 520                  * But is a security vulnerability otherwise!
 521                  */
 522                 show_kernel_relocation(KERN_INFO);
 523 #endif
 524         }
 525 #endif
 526
 527         /*
 528          * Reserve initrd memory if needed.
 529          */
 530         finalize_initrd();
 531 }
 532
 533 #endif  /* CONFIG_SGI_IP27 */
 534
 535 /*
 536  * arch_mem_init - initialize memory management subsystem
 537  *
 538  *  o plat_mem_setup() detects the memory configuration and will record detected
 539  *    memory areas using add_memory_region.
 540  *
 541  * At this stage the memory configuration of the system is known to the
 542  * kernel but generic memory management system is still entirely uninitialized.
 543  *
 544  *  o bootmem_init()
 545  *  o sparse_init()
 546  *  o paging_init()
 547  *  o dma_contiguous_reserve()
 548  *
 549  * At this stage the bootmem allocator is ready to use.
 550  *
 551  * NOTE: historically plat_mem_setup did the entire platform initialization.
 552  *       This was rather impractical because it meant plat_mem_setup had to
 553  * get away without any kind of memory allocator.  To keep old code from
 554  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 555  * initialization hook for anything else was introduced.
 556  */
 557
 558 static int usermem __initdata;
 559
 560 static int __init early_parse_mem(char *p)
 561 {
 562         phys_addr_t start, size;
 563
 564         /*
 565          * If a user specifies memory size, we
 566          * blow away any automatically generated
 567          * size.
 568          */
 569         if (usermem == 0) {
 570                 boot_mem_map.nr_map = 0;
 571                 usermem = 1;
 572         }
 573         start = 0;
 574         size = memparse(p, &p);
 575         if (*p == '@')
 576                 start = memparse(p + 1, &p);
 577
 578         add_memory_region(start, size, BOOT_MEM_RAM);
 579         return 0;
 580 }
 581 early_param("mem", early_parse_mem);
 582
 583 #ifdef CONFIG_PROC_VMCORE
 584 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 585 static int __init early_parse_elfcorehdr(char *p)
 586 {
 587         int i;
 588
 589         setup_elfcorehdr = memparse(p, &p);
 590
 591         for (i = 0; i < boot_mem_map.nr_map; i++) {
 592                 unsigned long start = boot_mem_map.map[i].addr;
 593                 unsigned long end = (boot_mem_map.map[i].addr +
 594                                      boot_mem_map.map[i].size);
 595                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 596                         /*
 597                          * Reserve from the elf core header to the end of
 598                          * the memory segment, that should all be kdump
 599                          * reserved memory.
 600                          */
 601                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 602                         break;
 603                 }
 604         }
 605         /*
 606          * If we don't find it in the memory map, then we shouldn't
 607          * have to worry about it, as the new kernel won't use it.
 608          */
 609         return 0;
 610 }
 611 early_param("elfcorehdr", early_parse_elfcorehdr);
 612 #endif
 613
 614 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
 615 {
 616         phys_addr_t size;
 617         int i;
 618
 619         size = end - mem;
 620         if (!size)
 621                 return;
 622
 623         /* Make sure it is in the boot_mem_map */
 624         for (i = 0; i < boot_mem_map.nr_map; i++) {
 625                 if (mem >= boot_mem_map.map[i].addr &&
 626                     mem < (boot_mem_map.map[i].addr +
 627                            boot_mem_map.map[i].size))
 628                         return;
 629         }
 630         add_memory_region(mem, size, type);
 631 }
 632
 633 #ifdef CONFIG_KEXEC
 634 static inline unsigned long long get_total_mem(void)
 635 {
 636         unsigned long long total;
 637
 638         total = max_pfn - min_low_pfn;
 639         return total << PAGE_SHIFT;
 640 }
 641
 642 static void __init mips_parse_crashkernel(void)
 643 {
 644         unsigned long long total_mem;
 645         unsigned long long crash_size, crash_base;
 646         int ret;
 647
 648         total_mem = get_total_mem();
 649         ret = parse_crashkernel(boot_command_line, total_mem,
 650                                 &crash_size, &crash_base);
 651         if (ret != 0 || crash_size <= 0)
 652                 return;
 653
 654         crashk_res.start = crash_base;
 655         crashk_res.end   = crash_base + crash_size - 1;
 656 }
 657
 658 static void __init request_crashkernel(struct resource *res)
 659 {
 660         int ret;
 661
 662         ret = request_resource(res, &crashk_res);
 663         if (!ret)
 664                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 665                         (unsigned long)((crashk_res.end -
 666                                          crashk_res.start + 1) >> 20),
 667                         (unsigned long)(crashk_res.start  >> 20));
 668 }
 669 #else /* !defined(CONFIG_KEXEC)         */
 670 static void __init mips_parse_crashkernel(void)
 671 {
 672 }
 673
 674 static void __init request_crashkernel(struct resource *res)
 675 {
 676 }
 677 #endif /* !defined(CONFIG_KEXEC)  */
 678
 679 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
 680 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
 681 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
 682 #define BUILTIN_EXTEND_WITH_PROM        \
 683         IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
 684
 685 static void __init arch_mem_init(char **cmdline_p)
 686 {
 687         struct memblock_region *reg;
 688         extern void plat_mem_setup(void);
 689
 690         /* call board setup routine */
 691         plat_mem_setup();
 692
 693         /*
 694          * Make sure all kernel memory is in the maps.  The "UP" and
 695          * "DOWN" are opposite for initdata since if it crosses over
 696          * into another memory section you don't want that to be
 697          * freed when the initdata is freed.
 698          */
 699         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
 700                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
 701                          BOOT_MEM_RAM);
 702         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
 703                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
 704                          BOOT_MEM_INIT_RAM);
 705
 706         pr_info("Determined physical RAM map:\n");
 707         print_memory_map();
 708
 709 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
 710         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 711 #else
 712         if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
 713             (USE_DTB_CMDLINE && !boot_command_line[0]))
 714                 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 715
 716         if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
 717                 if (boot_command_line[0])
 718                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 719                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 720         }
 721
 722 #if defined(CONFIG_CMDLINE_BOOL)
 723         if (builtin_cmdline[0]) {
 724                 if (boot_command_line[0])
 725                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 726                 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 727         }
 728
 729         if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
 730                 if (boot_command_line[0])
 731                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 732                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 733         }
 734 #endif
 735 #endif
 736         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 737
 738         *cmdline_p = command_line;
 739
 740         parse_early_param();
 741
 742         if (usermem) {
 743                 pr_info("User-defined physical RAM map:\n");
 744                 print_memory_map();
 745         }
 746
 747         bootmem_init();
 748 #ifdef CONFIG_PROC_VMCORE
 749         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 750                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 751                        setup_elfcorehdr, setup_elfcorehdr_size);
 752                 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
 753                                 BOOTMEM_DEFAULT);
 754         }
 755 #endif
 756
 757         mips_parse_crashkernel();
 758 #ifdef CONFIG_KEXEC
 759         if (crashk_res.start != crashk_res.end)
 760                 reserve_bootmem(crashk_res.start,
 761                                 crashk_res.end - crashk_res.start + 1,
 762                                 BOOTMEM_DEFAULT);
 763 #endif
 764         device_tree_init();
 765         sparse_init();
 766         plat_swiotlb_setup();
 767
 768         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 769         /* Tell bootmem about cma reserved memblock section */
 770         for_each_memblock(reserved, reg)
 771                 if (reg->size != 0)
 772                         reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
 773
 774         reserve_bootmem_region(__pa_symbol(&__nosave_begin),
 775                         __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
 776 }
 777
 778 static void __init resource_init(void)
 779 {
 780         int i;
 781
 782         if (UNCAC_BASE != IO_BASE)
 783                 return;
 784
 785         code_resource.start = __pa_symbol(&_text);
 786         code_resource.end = __pa_symbol(&_etext) - 1;
 787         data_resource.start = __pa_symbol(&_etext);
 788         data_resource.end = __pa_symbol(&_edata) - 1;
 789
 790         for (i = 0; i < boot_mem_map.nr_map; i++) {
 791                 struct resource *res;
 792                 unsigned long start, end;
 793
 794                 start = boot_mem_map.map[i].addr;
 795                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 796                 if (start >= HIGHMEM_START)
 797                         continue;
 798                 if (end >= HIGHMEM_START)
 799                         end = HIGHMEM_START - 1;
 800
 801                 res = alloc_bootmem(sizeof(struct resource));
 802
 803                 res->start = start;
 804                 res->end = end;
 805                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 806
 807                 switch (boot_mem_map.map[i].type) {
 808                 case BOOT_MEM_RAM:
 809                 case BOOT_MEM_INIT_RAM:
 810                 case BOOT_MEM_ROM_DATA:
 811                         res->name = "System RAM";
 812                         res->flags |= IORESOURCE_SYSRAM;
 813                         break;
 814                 case BOOT_MEM_RESERVED:
 815                 default:
 816                         res->name = "reserved";
 817                 }
 818
 819                 request_resource(&iomem_resource, res);
 820
 821                 /*
 822                  *  We don't know which RAM region contains kernel data,
 823                  *  so we try it repeatedly and let the resource manager
 824                  *  test it.
 825                  */
 826                 request_resource(res, &code_resource);
 827                 request_resource(res, &data_resource);
 828                 request_crashkernel(res);
 829         }
 830 }
 831
 832 #ifdef CONFIG_SMP
 833 static void __init prefill_possible_map(void)
 834 {
 835         int i, possible = num_possible_cpus();
 836
 837         if (possible > nr_cpu_ids)
 838                 possible = nr_cpu_ids;
 839
 840         for (i = 0; i < possible; i++)
 841                 set_cpu_possible(i, true);
 842         for (; i < NR_CPUS; i++)
 843                 set_cpu_possible(i, false);
 844
 845         nr_cpu_ids = possible;
 846 }
 847 #else
 848 static inline void prefill_possible_map(void) {}
 849 #endif
 850
 851 void __init setup_arch(char **cmdline_p)
 852 {
 853         cpu_probe();
 854         mips_cm_probe();
 855         prom_init();
 856
 857         setup_early_fdc_console();
 858 #ifdef CONFIG_EARLY_PRINTK
 859         setup_early_printk();
 860 #endif
 861         cpu_report();
 862         check_bugs_early();
 863
 864 #if defined(CONFIG_VT)
 865 #if defined(CONFIG_VGA_CONSOLE)
 866         conswitchp = &vga_con;
 867 #elif defined(CONFIG_DUMMY_CONSOLE)
 868         conswitchp = &dummy_con;
 869 #endif
 870 #endif
 871
 872         arch_mem_init(cmdline_p);
 873
 874         resource_init();
 875         plat_smp_setup();
 876         prefill_possible_map();
 877
 878         cpu_cache_init();
 879         paging_init();
 880 }
 881
 882 unsigned long kernelsp[NR_CPUS];
 883 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
 884
 885 #ifdef CONFIG_USE_OF
 886 unsigned long fw_passed_dtb;
 887 #endif
 888
 889 #ifdef CONFIG_DEBUG_FS
 890 struct dentry *mips_debugfs_dir;
 891 static int __init debugfs_mips(void)
 892 {
 893         struct dentry *d;
 894
 895         d = debugfs_create_dir("mips", NULL);
 896         if (!d)
 897                 return -ENOMEM;
 898         mips_debugfs_dir = d;
 899         return 0;
 900 }
 901 arch_initcall(debugfs_mips);
 902 #endif