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 #include <linux/of_fdt.h>
  31
  32 #include <asm/addrspace.h>
  33 #include <asm/bootinfo.h>
  34 #include <asm/bugs.h>
  35 #include <asm/cache.h>
  36 #include <asm/cdmm.h>
  37 #include <asm/cpu.h>
  38 #include <asm/debug.h>
  39 #include <asm/dma-coherence.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
  46 const char __section(.appended_dtb) __appended_dtb[0x100000];
  47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  48
  49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  50
  51 EXPORT_SYMBOL(cpu_data);
  52
  53 #ifdef CONFIG_VT
  54 struct screen_info screen_info;
  55 #endif
  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 struct boot_mem_map boot_mem_map;
  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 char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  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 const 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 static void *detect_magic __initdata = detect_memory_region;
  87
  88 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
  89 unsigned long ARCH_PFN_OFFSET;
  90 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
  91 #endif
  92
  93 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
  94 {
  95         int x = boot_mem_map.nr_map;
  96         int i;
  97
  98         /*
  99          * If the region reaches the top of the physical address space, adjust
 100          * the size slightly so that (start + size) doesn't overflow
 101          */
 102         if (start + size - 1 == PHYS_ADDR_MAX)
 103                 --size;
 104
 105         /* Sanity check */
 106         if (start + size < start) {
 107                 pr_warn("Trying to add an invalid memory region, skipped\n");
 108                 return;
 109         }
 110
 111         /*
 112          * Try to merge with existing entry, if any.
 113          */
 114         for (i = 0; i < boot_mem_map.nr_map; i++) {
 115                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
 116                 unsigned long top;
 117
 118                 if (entry->type != type)
 119                         continue;
 120
 121                 if (start + size < entry->addr)
 122                         continue;                       /* no overlap */
 123
 124                 if (entry->addr + entry->size < start)
 125                         continue;                       /* no overlap */
 126
 127                 top = max(entry->addr + entry->size, start + size);
 128                 entry->addr = min(entry->addr, start);
 129                 entry->size = top - entry->addr;
 130
 131                 return;
 132         }
 133
 134         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 135                 pr_err("Ooops! Too many entries in the memory map!\n");
 136                 return;
 137         }
 138
 139         boot_mem_map.map[x].addr = start;
 140         boot_mem_map.map[x].size = size;
 141         boot_mem_map.map[x].type = type;
 142         boot_mem_map.nr_map++;
 143 }
 144
 145 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
 146 {
 147         void *dm = &detect_magic;
 148         phys_addr_t size;
 149
 150         for (size = sz_min; size < sz_max; size <<= 1) {
 151                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 152                         break;
 153         }
 154
 155         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 156                 ((unsigned long long) size) / SZ_1M,
 157                 (unsigned long long) start,
 158                 ((unsigned long long) sz_min) / SZ_1M,
 159                 ((unsigned long long) sz_max) / SZ_1M);
 160
 161         add_memory_region(start, size, BOOT_MEM_RAM);
 162 }
 163
 164 static bool __init __maybe_unused memory_region_available(phys_addr_t start,
 165                                                           phys_addr_t size)
 166 {
 167         int i;
 168         bool in_ram = false, free = true;
 169
 170         for (i = 0; i < boot_mem_map.nr_map; i++) {
 171                 phys_addr_t start_, end_;
 172
 173                 start_ = boot_mem_map.map[i].addr;
 174                 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
 175
 176                 switch (boot_mem_map.map[i].type) {
 177                 case BOOT_MEM_RAM:
 178                         if (start >= start_ && start + size <= end_)
 179                                 in_ram = true;
 180                         break;
 181                 case BOOT_MEM_RESERVED:
 182                         if ((start >= start_ && start < end_) ||
 183                             (start < start_ && start + size >= start_))
 184                                 free = false;
 185                         break;
 186                 default:
 187                         continue;
 188                 }
 189         }
 190
 191         return in_ram && free;
 192 }
 193
 194 static void __init print_memory_map(void)
 195 {
 196         int i;
 197         const int field = 2 * sizeof(unsigned long);
 198
 199         for (i = 0; i < boot_mem_map.nr_map; i++) {
 200                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 201                        field, (unsigned long long) boot_mem_map.map[i].size,
 202                        field, (unsigned long long) boot_mem_map.map[i].addr);
 203
 204                 switch (boot_mem_map.map[i].type) {
 205                 case BOOT_MEM_RAM:
 206                         printk(KERN_CONT "(usable)\n");
 207                         break;
 208                 case BOOT_MEM_INIT_RAM:
 209                         printk(KERN_CONT "(usable after init)\n");
 210                         break;
 211                 case BOOT_MEM_ROM_DATA:
 212                         printk(KERN_CONT "(ROM data)\n");
 213                         break;
 214                 case BOOT_MEM_RESERVED:
 215                         printk(KERN_CONT "(reserved)\n");
 216                         break;
 217                 default:
 218                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 219                         break;
 220                 }
 221         }
 222 }
 223
 224 /*
 225  * Manage initrd
 226  */
 227 #ifdef CONFIG_BLK_DEV_INITRD
 228
 229 static int __init rd_start_early(char *p)
 230 {
 231         unsigned long start = memparse(p, &p);
 232
 233 #ifdef CONFIG_64BIT
 234         /* Guess if the sign extension was forgotten by bootloader */
 235         if (start < XKPHYS)
 236                 start = (int)start;
 237 #endif
 238         initrd_start = start;
 239         initrd_end += start;
 240         return 0;
 241 }
 242 early_param("rd_start", rd_start_early);
 243
 244 static int __init rd_size_early(char *p)
 245 {
 246         initrd_end += memparse(p, &p);
 247         return 0;
 248 }
 249 early_param("rd_size", rd_size_early);
 250
 251 /* it returns the next free pfn after initrd */
 252 static unsigned long __init init_initrd(void)
 253 {
 254         unsigned long end;
 255
 256         /*
 257          * Board specific code or command line parser should have
 258          * already set up initrd_start and initrd_end. In these cases
 259          * perfom sanity checks and use them if all looks good.
 260          */
 261         if (!initrd_start || initrd_end <= initrd_start)
 262                 goto disable;
 263
 264         if (initrd_start & ~PAGE_MASK) {
 265                 pr_err("initrd start must be page aligned\n");
 266                 goto disable;
 267         }
 268         if (initrd_start < PAGE_OFFSET) {
 269                 pr_err("initrd start < PAGE_OFFSET\n");
 270                 goto disable;
 271         }
 272
 273         /*
 274          * Sanitize initrd addresses. For example firmware
 275          * can't guess if they need to pass them through
 276          * 64-bits values if the kernel has been built in pure
 277          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 278          * addresses now, so the code can now safely use __pa().
 279          */
 280         end = __pa(initrd_end);
 281         initrd_end = (unsigned long)__va(end);
 282         initrd_start = (unsigned long)__va(__pa(initrd_start));
 283
 284         ROOT_DEV = Root_RAM0;
 285         return PFN_UP(end);
 286 disable:
 287         initrd_start = 0;
 288         initrd_end = 0;
 289         return 0;
 290 }
 291
 292 /* In some conditions (e.g. big endian bootloader with a little endian
 293    kernel), the initrd might appear byte swapped.  Try to detect this and
 294    byte swap it if needed.  */
 295 static void __init maybe_bswap_initrd(void)
 296 {
 297 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 298         u64 buf;
 299
 300         /* Check for CPIO signature */
 301         if (!memcmp((void *)initrd_start, "070701", 6))
 302                 return;
 303
 304         /* Check for compressed initrd */
 305         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 306                 return;
 307
 308         /* Try again with a byte swapped header */
 309         buf = swab64p((u64 *)initrd_start);
 310         if (!memcmp(&buf, "070701", 6) ||
 311             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 312                 unsigned long i;
 313
 314                 pr_info("Byteswapped initrd detected\n");
 315                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 316                         swab64s((u64 *)i);
 317         }
 318 #endif
 319 }
 320
 321 static void __init finalize_initrd(void)
 322 {
 323         unsigned long size = initrd_end - initrd_start;
 324
 325         if (size == 0) {
 326                 printk(KERN_INFO "Initrd not found or empty");
 327                 goto disable;
 328         }
 329         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 330                 printk(KERN_ERR "Initrd extends beyond end of memory");
 331                 goto disable;
 332         }
 333
 334         maybe_bswap_initrd();
 335
 336         memblock_reserve(__pa(initrd_start), size);
 337         initrd_below_start_ok = 1;
 338
 339         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 340                 initrd_start, size);
 341         return;
 342 disable:
 343         printk(KERN_CONT " - disabling initrd\n");
 344         initrd_start = 0;
 345         initrd_end = 0;
 346 }
 347
 348 #else  /* !CONFIG_BLK_DEV_INITRD */
 349
 350 static unsigned long __init init_initrd(void)
 351 {
 352         return 0;
 353 }
 354
 355 #define finalize_initrd()       do {} while (0)
 356
 357 #endif
 358
 359 /*
 360  * Initialize the bootmem allocator. It also setup initrd related data
 361  * if needed.
 362  */
 363 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
 364
 365 static void __init bootmem_init(void)
 366 {
 367         init_initrd();
 368         finalize_initrd();
 369 }
 370
 371 #else  /* !CONFIG_SGI_IP27 */
 372
 373 static void __init bootmem_init(void)
 374 {
 375         unsigned long reserved_end;
 376         phys_addr_t ramstart = PHYS_ADDR_MAX;
 377         int i;
 378
 379         /*
 380          * Sanity check any INITRD first. We don't take it into account
 381          * for bootmem setup initially, rely on the end-of-kernel-code
 382          * as our memory range starting point. Once bootmem is inited we
 383          * will reserve the area used for the initrd.
 384          */
 385         init_initrd();
 386         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 387
 388         memblock_reserve(PHYS_OFFSET, reserved_end << PAGE_SHIFT);
 389
 390         /*
 391          * max_low_pfn is not a number of pages. The number of pages
 392          * of the system is given by 'max_low_pfn - min_low_pfn'.
 393          */
 394         min_low_pfn = ~0UL;
 395         max_low_pfn = 0;
 396
 397         /*
 398          * Find the highest page frame number we have available
 399          * and the lowest used RAM address
 400          */
 401         for (i = 0; i < boot_mem_map.nr_map; i++) {
 402                 unsigned long start, end;
 403
 404                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 405                         continue;
 406
 407                 start = PFN_UP(boot_mem_map.map[i].addr);
 408                 end = PFN_DOWN(boot_mem_map.map[i].addr
 409                                 + boot_mem_map.map[i].size);
 410
 411                 ramstart = min(ramstart, boot_mem_map.map[i].addr);
 412
 413 #ifndef CONFIG_HIGHMEM
 414                 /*
 415                  * Skip highmem here so we get an accurate max_low_pfn if low
 416                  * memory stops short of high memory.
 417                  * If the region overlaps HIGHMEM_START, end is clipped so
 418                  * max_pfn excludes the highmem portion.
 419                  */
 420                 if (start >= PFN_DOWN(HIGHMEM_START))
 421                         continue;
 422                 if (end > PFN_DOWN(HIGHMEM_START))
 423                         end = PFN_DOWN(HIGHMEM_START);
 424 #endif
 425
 426                 if (end > max_low_pfn)
 427                         max_low_pfn = end;
 428                 if (start < min_low_pfn)
 429                         min_low_pfn = start;
 430                 if (end <= reserved_end)
 431                         continue;
 432 #ifdef CONFIG_BLK_DEV_INITRD
 433                 /* Skip zones before initrd and initrd itself */
 434                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
 435                         continue;
 436 #endif
 437         }
 438
 439         if (min_low_pfn >= max_low_pfn)
 440                 panic("Incorrect memory mapping !!!");
 441
 442 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 443         ARCH_PFN_OFFSET = PFN_UP(ramstart);
 444 #else
 445         /*
 446          * Reserve any memory between the start of RAM and PHYS_OFFSET
 447          */
 448         if (ramstart > PHYS_OFFSET) {
 449                 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
 450                                   BOOT_MEM_RESERVED);
 451                 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
 452         }
 453
 454         if (min_low_pfn > ARCH_PFN_OFFSET) {
 455                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 456                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 457                         min_low_pfn - ARCH_PFN_OFFSET);
 458         } else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) {
 459                 pr_info("%lu free pages won't be used\n",
 460                         ARCH_PFN_OFFSET - min_low_pfn);
 461         }
 462         min_low_pfn = ARCH_PFN_OFFSET;
 463 #endif
 464
 465         /*
 466          * Determine low and high memory ranges
 467          */
 468         max_pfn = max_low_pfn;
 469         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 470 #ifdef CONFIG_HIGHMEM
 471                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 472                 highend_pfn = max_low_pfn;
 473 #endif
 474                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 475         }
 476
 477         for (i = 0; i < boot_mem_map.nr_map; i++) {
 478                 unsigned long start, end;
 479
 480                 start = PFN_UP(boot_mem_map.map[i].addr);
 481                 end = PFN_DOWN(boot_mem_map.map[i].addr
 482                                 + boot_mem_map.map[i].size);
 483
 484                 if (start <= min_low_pfn)
 485                         start = min_low_pfn;
 486                 if (start >= end)
 487                         continue;
 488
 489 #ifndef CONFIG_HIGHMEM
 490                 if (end > max_low_pfn)
 491                         end = max_low_pfn;
 492
 493                 /*
 494                  * ... finally, is the area going away?
 495                  */
 496                 if (end <= start)
 497                         continue;
 498 #endif
 499
 500                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 501         }
 502
 503         /*
 504          * Register fully available low RAM pages with the bootmem allocator.
 505          */
 506         for (i = 0; i < boot_mem_map.nr_map; i++) {
 507                 unsigned long start, end, size;
 508
 509                 start = PFN_UP(boot_mem_map.map[i].addr);
 510                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 511                                     + boot_mem_map.map[i].size);
 512
 513                 /*
 514                  * Reserve usable memory.
 515                  */
 516                 switch (boot_mem_map.map[i].type) {
 517                 case BOOT_MEM_RAM:
 518                         break;
 519                 case BOOT_MEM_INIT_RAM:
 520                         memory_present(0, start, end);
 521                         continue;
 522                 default:
 523                         /* Not usable memory */
 524                         if (start > min_low_pfn && end < max_low_pfn)
 525                                 memblock_reserve(boot_mem_map.map[i].addr,
 526                                                 boot_mem_map.map[i].size);
 527
 528                         continue;
 529                 }
 530
 531                 /*
 532                  * We are rounding up the start address of usable memory
 533                  * and at the end of the usable range downwards.
 534                  */
 535                 if (start >= max_low_pfn)
 536                         continue;
 537                 if (start < reserved_end)
 538                         start = reserved_end;
 539                 if (end > max_low_pfn)
 540                         end = max_low_pfn;
 541
 542                 /*
 543                  * ... finally, is the area going away?
 544                  */
 545                 if (end <= start)
 546                         continue;
 547                 size = end - start;
 548
 549                 /* Register lowmem ranges */
 550                 memory_present(0, start, end);
 551         }
 552
 553 #ifdef CONFIG_RELOCATABLE
 554         /*
 555          * The kernel reserves all memory below its _end symbol as bootmem,
 556          * but the kernel may now be at a much higher address. The memory
 557          * between the original and new locations may be returned to the system.
 558          */
 559         if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
 560                 unsigned long offset;
 561                 extern void show_kernel_relocation(const char *level);
 562
 563                 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
 564                 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
 565
 566 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
 567                 /*
 568                  * This information is necessary when debugging the kernel
 569                  * But is a security vulnerability otherwise!
 570                  */
 571                 show_kernel_relocation(KERN_INFO);
 572 #endif
 573         }
 574 #endif
 575
 576         /*
 577          * Reserve initrd memory if needed.
 578          */
 579         finalize_initrd();
 580 }
 581
 582 #endif  /* CONFIG_SGI_IP27 */
 583
 584 static int usermem __initdata;
 585
 586 static int __init early_parse_mem(char *p)
 587 {
 588         phys_addr_t start, size;
 589
 590         /*
 591          * If a user specifies memory size, we
 592          * blow away any automatically generated
 593          * size.
 594          */
 595         if (usermem == 0) {
 596                 boot_mem_map.nr_map = 0;
 597                 usermem = 1;
 598         }
 599         start = 0;
 600         size = memparse(p, &p);
 601         if (*p == '@')
 602                 start = memparse(p + 1, &p);
 603
 604         add_memory_region(start, size, BOOT_MEM_RAM);
 605
 606         return 0;
 607 }
 608 early_param("mem", early_parse_mem);
 609
 610 static int __init early_parse_memmap(char *p)
 611 {
 612         char *oldp;
 613         u64 start_at, mem_size;
 614
 615         if (!p)
 616                 return -EINVAL;
 617
 618         if (!strncmp(p, "exactmap", 8)) {
 619                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 620                 return 0;
 621         }
 622
 623         oldp = p;
 624         mem_size = memparse(p, &p);
 625         if (p == oldp)
 626                 return -EINVAL;
 627
 628         if (*p == '@') {
 629                 start_at = memparse(p+1, &p);
 630                 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 631         } else if (*p == '#') {
 632                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 633                 return -EINVAL;
 634         } else if (*p == '$') {
 635                 start_at = memparse(p+1, &p);
 636                 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
 637         } else {
 638                 pr_err("\"memmap\" invalid format!\n");
 639                 return -EINVAL;
 640         }
 641
 642         if (*p == '\0') {
 643                 usermem = 1;
 644                 return 0;
 645         } else
 646                 return -EINVAL;
 647 }
 648 early_param("memmap", early_parse_memmap);
 649
 650 #ifdef CONFIG_PROC_VMCORE
 651 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 652 static int __init early_parse_elfcorehdr(char *p)
 653 {
 654         int i;
 655
 656         setup_elfcorehdr = memparse(p, &p);
 657
 658         for (i = 0; i < boot_mem_map.nr_map; i++) {
 659                 unsigned long start = boot_mem_map.map[i].addr;
 660                 unsigned long end = (boot_mem_map.map[i].addr +
 661                                      boot_mem_map.map[i].size);
 662                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 663                         /*
 664                          * Reserve from the elf core header to the end of
 665                          * the memory segment, that should all be kdump
 666                          * reserved memory.
 667                          */
 668                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 669                         break;
 670                 }
 671         }
 672         /*
 673          * If we don't find it in the memory map, then we shouldn't
 674          * have to worry about it, as the new kernel won't use it.
 675          */
 676         return 0;
 677 }
 678 early_param("elfcorehdr", early_parse_elfcorehdr);
 679 #endif
 680
 681 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
 682 {
 683         phys_addr_t size;
 684         int i;
 685
 686         size = end - mem;
 687         if (!size)
 688                 return;
 689
 690         /* Make sure it is in the boot_mem_map */
 691         for (i = 0; i < boot_mem_map.nr_map; i++) {
 692                 if (mem >= boot_mem_map.map[i].addr &&
 693                     mem < (boot_mem_map.map[i].addr +
 694                            boot_mem_map.map[i].size))
 695                         return;
 696         }
 697         add_memory_region(mem, size, type);
 698 }
 699
 700 #ifdef CONFIG_KEXEC
 701 static inline unsigned long long get_total_mem(void)
 702 {
 703         unsigned long long total;
 704
 705         total = max_pfn - min_low_pfn;
 706         return total << PAGE_SHIFT;
 707 }
 708
 709 static void __init mips_parse_crashkernel(void)
 710 {
 711         unsigned long long total_mem;
 712         unsigned long long crash_size, crash_base;
 713         int ret;
 714
 715         total_mem = get_total_mem();
 716         ret = parse_crashkernel(boot_command_line, total_mem,
 717                                 &crash_size, &crash_base);
 718         if (ret != 0 || crash_size <= 0)
 719                 return;
 720
 721         if (!memory_region_available(crash_base, crash_size)) {
 722                 pr_warn("Invalid memory region reserved for crash kernel\n");
 723                 return;
 724         }
 725
 726         crashk_res.start = crash_base;
 727         crashk_res.end   = crash_base + crash_size - 1;
 728 }
 729
 730 static void __init request_crashkernel(struct resource *res)
 731 {
 732         int ret;
 733
 734         if (crashk_res.start == crashk_res.end)
 735                 return;
 736
 737         ret = request_resource(res, &crashk_res);
 738         if (!ret)
 739                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 740                         (unsigned long)((crashk_res.end -
 741                                          crashk_res.start + 1) >> 20),
 742                         (unsigned long)(crashk_res.start  >> 20));
 743 }
 744 #else /* !defined(CONFIG_KEXEC)         */
 745 static void __init mips_parse_crashkernel(void)
 746 {
 747 }
 748
 749 static void __init request_crashkernel(struct resource *res)
 750 {
 751 }
 752 #endif /* !defined(CONFIG_KEXEC)  */
 753
 754 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
 755 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
 756 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
 757 #define BUILTIN_EXTEND_WITH_PROM        \
 758         IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
 759
 760 /*
 761  * arch_mem_init - initialize memory management subsystem
 762  *
 763  *  o plat_mem_setup() detects the memory configuration and will record detected
 764  *    memory areas using add_memory_region.
 765  *
 766  * At this stage the memory configuration of the system is known to the
 767  * kernel but generic memory management system is still entirely uninitialized.
 768  *
 769  *  o bootmem_init()
 770  *  o sparse_init()
 771  *  o paging_init()
 772  *  o dma_contiguous_reserve()
 773  *
 774  * At this stage the bootmem allocator is ready to use.
 775  *
 776  * NOTE: historically plat_mem_setup did the entire platform initialization.
 777  *       This was rather impractical because it meant plat_mem_setup had to
 778  * get away without any kind of memory allocator.  To keep old code from
 779  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 780  * initialization hook for anything else was introduced.
 781  */
 782 static void __init arch_mem_init(char **cmdline_p)
 783 {
 784         struct memblock_region *reg;
 785         extern void plat_mem_setup(void);
 786
 787         /*
 788          * Initialize boot_command_line to an innocuous but non-empty string in
 789          * order to prevent early_init_dt_scan_chosen() from copying
 790          * CONFIG_CMDLINE into it without our knowledge. We handle
 791          * CONFIG_CMDLINE ourselves below & don't want to duplicate its
 792          * content because repeating arguments can be problematic.
 793          */
 794         strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
 795
 796         /* call board setup routine */
 797         plat_mem_setup();
 798
 799         /*
 800          * Make sure all kernel memory is in the maps.  The "UP" and
 801          * "DOWN" are opposite for initdata since if it crosses over
 802          * into another memory section you don't want that to be
 803          * freed when the initdata is freed.
 804          */
 805         arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
 806                          PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
 807                          BOOT_MEM_RAM);
 808         arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
 809                          PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
 810                          BOOT_MEM_INIT_RAM);
 811
 812         pr_info("Determined physical RAM map:\n");
 813         print_memory_map();
 814
 815 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
 816         strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 817 #else
 818         if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
 819             (USE_DTB_CMDLINE && !boot_command_line[0]))
 820                 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 821
 822         if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
 823                 if (boot_command_line[0])
 824                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 825                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 826         }
 827
 828 #if defined(CONFIG_CMDLINE_BOOL)
 829         if (builtin_cmdline[0]) {
 830                 if (boot_command_line[0])
 831                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 832                 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
 833         }
 834
 835         if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
 836                 if (boot_command_line[0])
 837                         strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 838                 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
 839         }
 840 #endif
 841 #endif
 842         strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 843
 844         *cmdline_p = command_line;
 845
 846         parse_early_param();
 847
 848         if (usermem) {
 849                 pr_info("User-defined physical RAM map:\n");
 850                 print_memory_map();
 851         }
 852
 853         early_init_fdt_reserve_self();
 854         early_init_fdt_scan_reserved_mem();
 855
 856         bootmem_init();
 857
 858         /*
 859          * Prevent memblock from allocating high memory.
 860          * This cannot be done before max_low_pfn is detected, so up
 861          * to this point is possible to only reserve physical memory
 862          * with memblock_reserve; memblock_alloc* can be used
 863          * only after this point
 864          */
 865         memblock_set_current_limit(PFN_PHYS(max_low_pfn));
 866
 867 #ifdef CONFIG_PROC_VMCORE
 868         if (setup_elfcorehdr && setup_elfcorehdr_size) {
 869                 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
 870                        setup_elfcorehdr, setup_elfcorehdr_size);
 871                 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
 872         }
 873 #endif
 874
 875         mips_parse_crashkernel();
 876 #ifdef CONFIG_KEXEC
 877         if (crashk_res.start != crashk_res.end)
 878                 memblock_reserve(crashk_res.start,
 879                                  crashk_res.end - crashk_res.start + 1);
 880 #endif
 881         device_tree_init();
 882         sparse_init();
 883         plat_swiotlb_setup();
 884
 885         dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
 886         /* Tell bootmem about cma reserved memblock section */
 887         for_each_memblock(reserved, reg)
 888                 if (reg->size != 0)
 889                         memblock_reserve(reg->base, reg->size);
 890
 891         reserve_bootmem_region(__pa_symbol(&__nosave_begin),
 892                         __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
 893 }
 894
 895 static void __init resource_init(void)
 896 {
 897         int i;
 898
 899         if (UNCAC_BASE != IO_BASE)
 900                 return;
 901
 902         code_resource.start = __pa_symbol(&_text);
 903         code_resource.end = __pa_symbol(&_etext) - 1;
 904         data_resource.start = __pa_symbol(&_etext);
 905         data_resource.end = __pa_symbol(&_edata) - 1;
 906         bss_resource.start = __pa_symbol(&__bss_start);
 907         bss_resource.end = __pa_symbol(&__bss_stop) - 1;
 908
 909         for (i = 0; i < boot_mem_map.nr_map; i++) {
 910                 struct resource *res;
 911                 unsigned long start, end;
 912
 913                 start = boot_mem_map.map[i].addr;
 914                 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
 915                 if (start >= HIGHMEM_START)
 916                         continue;
 917                 if (end >= HIGHMEM_START)
 918                         end = HIGHMEM_START - 1;
 919
 920                 res = alloc_bootmem(sizeof(struct resource));
 921
 922                 res->start = start;
 923                 res->end = end;
 924                 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 925
 926                 switch (boot_mem_map.map[i].type) {
 927                 case BOOT_MEM_RAM:
 928                 case BOOT_MEM_INIT_RAM:
 929                 case BOOT_MEM_ROM_DATA:
 930                         res->name = "System RAM";
 931                         res->flags |= IORESOURCE_SYSRAM;
 932                         break;
 933                 case BOOT_MEM_RESERVED:
 934                 default:
 935                         res->name = "reserved";
 936                 }
 937
 938                 request_resource(&iomem_resource, res);
 939
 940                 /*
 941                  *  We don't know which RAM region contains kernel data,
 942                  *  so we try it repeatedly and let the resource manager
 943                  *  test it.
 944                  */
 945                 request_resource(res, &code_resource);
 946                 request_resource(res, &data_resource);
 947                 request_resource(res, &bss_resource);
 948                 request_crashkernel(res);
 949         }
 950 }
 951
 952 #ifdef CONFIG_SMP
 953 static void __init prefill_possible_map(void)
 954 {
 955         int i, possible = num_possible_cpus();
 956
 957         if (possible > nr_cpu_ids)
 958                 possible = nr_cpu_ids;
 959
 960         for (i = 0; i < possible; i++)
 961                 set_cpu_possible(i, true);
 962         for (; i < NR_CPUS; i++)
 963                 set_cpu_possible(i, false);
 964
 965         nr_cpu_ids = possible;
 966 }
 967 #else
 968 static inline void prefill_possible_map(void) {}
 969 #endif
 970
 971 void __init setup_arch(char **cmdline_p)
 972 {
 973         cpu_probe();
 974         mips_cm_probe();
 975         prom_init();
 976
 977         setup_early_fdc_console();
 978 #ifdef CONFIG_EARLY_PRINTK
 979         setup_early_printk();
 980 #endif
 981         cpu_report();
 982         check_bugs_early();
 983
 984 #if defined(CONFIG_VT)
 985 #if defined(CONFIG_VGA_CONSOLE)
 986         conswitchp = &vga_con;
 987 #elif defined(CONFIG_DUMMY_CONSOLE)
 988         conswitchp = &dummy_con;
 989 #endif
 990 #endif
 991
 992         arch_mem_init(cmdline_p);
 993
 994         resource_init();
 995         plat_smp_setup();
 996         prefill_possible_map();
 997
 998         cpu_cache_init();
 999         paging_init();
1000 }
1001
1002 unsigned long kernelsp[NR_CPUS];
1003 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
1004
1005 #ifdef CONFIG_USE_OF
1006 unsigned long fw_passed_dtb;
1007 #endif
1008
1009 #ifdef CONFIG_DEBUG_FS
1010 struct dentry *mips_debugfs_dir;
1011 static int __init debugfs_mips(void)
1012 {
1013         struct dentry *d;
1014
1015         d = debugfs_create_dir("mips", NULL);
1016         if (!d)
1017                 return -ENOMEM;
1018         mips_debugfs_dir = d;
1019         return 0;
1020 }
1021 arch_initcall(debugfs_mips);
1022 #endif
1023
1024 #ifdef CONFIG_DMA_MAYBE_COHERENT
1025 /* User defined DMA coherency from command line. */
1026 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
1027 EXPORT_SYMBOL_GPL(coherentio);
1028 int hw_coherentio = 0;  /* Actual hardware supported DMA coherency setting. */
1029
1030 static int __init setcoherentio(char *str)
1031 {
1032         coherentio = IO_COHERENCE_ENABLED;
1033         pr_info("Hardware DMA cache coherency (command line)\n");
1034         return 0;
1035 }
1036 early_param("coherentio", setcoherentio);
1037
1038 static int __init setnocoherentio(char *str)
1039 {
1040         coherentio = IO_COHERENCE_DISABLED;
1041         pr_info("Software DMA cache coherency (command line)\n");
1042         return 0;
1043 }
1044 early_param("nocoherentio", setnocoherentio);
1045 #endif