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-contiguous.h>
  28 #include <linux/decompress/generic.h>
  29 #include <linux/of_fdt.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/dma-coherence.h>
  39 #include <asm/sections.h>
  40 #include <asm/setup.h>
  41 #include <asm/smp-ops.h>
  42 #include <asm/prom.h>
  43
  44 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
  45 const char __section(.appended_dtb) __appended_dtb[0x100000];
  46 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
  47
  48 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
  49
  50 EXPORT_SYMBOL(cpu_data);
  51
  52 #ifdef CONFIG_VT
  53 struct screen_info screen_info;
  54 #endif
  55
  56 /*
  57  * Setup information
  58  *
  59  * These are initialized so they are in the .data section
  60  */
  61 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
  62
  63 EXPORT_SYMBOL(mips_machtype);
  64
  65 struct boot_mem_map boot_mem_map;
  66
  67 static char __initdata command_line[COMMAND_LINE_SIZE];
  68 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
  69
  70 #ifdef CONFIG_CMDLINE_BOOL
  71 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
  72 #endif
  73
  74 /*
  75  * mips_io_port_base is the begin of the address space to which x86 style
  76  * I/O ports are mapped.
  77  */
  78 const unsigned long mips_io_port_base = -1;
  79 EXPORT_SYMBOL(mips_io_port_base);
  80
  81 static struct resource code_resource = { .name = "Kernel code", };
  82 static struct resource data_resource = { .name = "Kernel data", };
  83 static struct resource bss_resource = { .name = "Kernel bss", };
  84
  85 static void *detect_magic __initdata = detect_memory_region;
  86
  87 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
  88 unsigned long ARCH_PFN_OFFSET;
  89 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
  90 #endif
  91
  92 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
  93 {
  94         int x = boot_mem_map.nr_map;
  95         int i;
  96
  97         /*
  98          * If the region reaches the top of the physical address space, adjust
  99          * the size slightly so that (start + size) doesn't overflow
 100          */
 101         if (start + size - 1 == PHYS_ADDR_MAX)
 102                 --size;
 103
 104         /* Sanity check */
 105         if (start + size < start) {
 106                 pr_warn("Trying to add an invalid memory region, skipped\n");
 107                 return;
 108         }
 109
 110         /*
 111          * Try to merge with existing entry, if any.
 112          */
 113         for (i = 0; i < boot_mem_map.nr_map; i++) {
 114                 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
 115                 unsigned long top;
 116
 117                 if (entry->type != type)
 118                         continue;
 119
 120                 if (start + size < entry->addr)
 121                         continue;                       /* no overlap */
 122
 123                 if (entry->addr + entry->size < start)
 124                         continue;                       /* no overlap */
 125
 126                 top = max(entry->addr + entry->size, start + size);
 127                 entry->addr = min(entry->addr, start);
 128                 entry->size = top - entry->addr;
 129
 130                 return;
 131         }
 132
 133         if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
 134                 pr_err("Ooops! Too many entries in the memory map!\n");
 135                 return;
 136         }
 137
 138         boot_mem_map.map[x].addr = start;
 139         boot_mem_map.map[x].size = size;
 140         boot_mem_map.map[x].type = type;
 141         boot_mem_map.nr_map++;
 142 }
 143
 144 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
 145 {
 146         void *dm = &detect_magic;
 147         phys_addr_t size;
 148
 149         for (size = sz_min; size < sz_max; size <<= 1) {
 150                 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
 151                         break;
 152         }
 153
 154         pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
 155                 ((unsigned long long) size) / SZ_1M,
 156                 (unsigned long long) start,
 157                 ((unsigned long long) sz_min) / SZ_1M,
 158                 ((unsigned long long) sz_max) / SZ_1M);
 159
 160         add_memory_region(start, size, BOOT_MEM_RAM);
 161 }
 162
 163 static bool __init __maybe_unused memory_region_available(phys_addr_t start,
 164                                                           phys_addr_t size)
 165 {
 166         int i;
 167         bool in_ram = false, free = true;
 168
 169         for (i = 0; i < boot_mem_map.nr_map; i++) {
 170                 phys_addr_t start_, end_;
 171
 172                 start_ = boot_mem_map.map[i].addr;
 173                 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
 174
 175                 switch (boot_mem_map.map[i].type) {
 176                 case BOOT_MEM_RAM:
 177                         if (start >= start_ && start + size <= end_)
 178                                 in_ram = true;
 179                         break;
 180                 case BOOT_MEM_RESERVED:
 181                         if ((start >= start_ && start < end_) ||
 182                             (start < start_ && start + size >= start_))
 183                                 free = false;
 184                         break;
 185                 default:
 186                         continue;
 187                 }
 188         }
 189
 190         return in_ram && free;
 191 }
 192
 193 static void __init print_memory_map(void)
 194 {
 195         int i;
 196         const int field = 2 * sizeof(unsigned long);
 197
 198         for (i = 0; i < boot_mem_map.nr_map; i++) {
 199                 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
 200                        field, (unsigned long long) boot_mem_map.map[i].size,
 201                        field, (unsigned long long) boot_mem_map.map[i].addr);
 202
 203                 switch (boot_mem_map.map[i].type) {
 204                 case BOOT_MEM_RAM:
 205                         printk(KERN_CONT "(usable)\n");
 206                         break;
 207                 case BOOT_MEM_INIT_RAM:
 208                         printk(KERN_CONT "(usable after init)\n");
 209                         break;
 210                 case BOOT_MEM_ROM_DATA:
 211                         printk(KERN_CONT "(ROM data)\n");
 212                         break;
 213                 case BOOT_MEM_RESERVED:
 214                         printk(KERN_CONT "(reserved)\n");
 215                         break;
 216                 default:
 217                         printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
 218                         break;
 219                 }
 220         }
 221 }
 222
 223 /*
 224  * Manage initrd
 225  */
 226 #ifdef CONFIG_BLK_DEV_INITRD
 227
 228 static int __init rd_start_early(char *p)
 229 {
 230         unsigned long start = memparse(p, &p);
 231
 232 #ifdef CONFIG_64BIT
 233         /* Guess if the sign extension was forgotten by bootloader */
 234         if (start < XKPHYS)
 235                 start = (int)start;
 236 #endif
 237         initrd_start = start;
 238         initrd_end += start;
 239         return 0;
 240 }
 241 early_param("rd_start", rd_start_early);
 242
 243 static int __init rd_size_early(char *p)
 244 {
 245         initrd_end += memparse(p, &p);
 246         return 0;
 247 }
 248 early_param("rd_size", rd_size_early);
 249
 250 /* it returns the next free pfn after initrd */
 251 static unsigned long __init init_initrd(void)
 252 {
 253         unsigned long end;
 254
 255         /*
 256          * Board specific code or command line parser should have
 257          * already set up initrd_start and initrd_end. In these cases
 258          * perfom sanity checks and use them if all looks good.
 259          */
 260         if (!initrd_start || initrd_end <= initrd_start)
 261                 goto disable;
 262
 263         if (initrd_start & ~PAGE_MASK) {
 264                 pr_err("initrd start must be page aligned\n");
 265                 goto disable;
 266         }
 267         if (initrd_start < PAGE_OFFSET) {
 268                 pr_err("initrd start < PAGE_OFFSET\n");
 269                 goto disable;
 270         }
 271
 272         /*
 273          * Sanitize initrd addresses. For example firmware
 274          * can't guess if they need to pass them through
 275          * 64-bits values if the kernel has been built in pure
 276          * 32-bit. We need also to switch from KSEG0 to XKPHYS
 277          * addresses now, so the code can now safely use __pa().
 278          */
 279         end = __pa(initrd_end);
 280         initrd_end = (unsigned long)__va(end);
 281         initrd_start = (unsigned long)__va(__pa(initrd_start));
 282
 283         ROOT_DEV = Root_RAM0;
 284         return PFN_UP(end);
 285 disable:
 286         initrd_start = 0;
 287         initrd_end = 0;
 288         return 0;
 289 }
 290
 291 /* In some conditions (e.g. big endian bootloader with a little endian
 292    kernel), the initrd might appear byte swapped.  Try to detect this and
 293    byte swap it if needed.  */
 294 static void __init maybe_bswap_initrd(void)
 295 {
 296 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
 297         u64 buf;
 298
 299         /* Check for CPIO signature */
 300         if (!memcmp((void *)initrd_start, "070701", 6))
 301                 return;
 302
 303         /* Check for compressed initrd */
 304         if (decompress_method((unsigned char *)initrd_start, 8, NULL))
 305                 return;
 306
 307         /* Try again with a byte swapped header */
 308         buf = swab64p((u64 *)initrd_start);
 309         if (!memcmp(&buf, "070701", 6) ||
 310             decompress_method((unsigned char *)(&buf), 8, NULL)) {
 311                 unsigned long i;
 312
 313                 pr_info("Byteswapped initrd detected\n");
 314                 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
 315                         swab64s((u64 *)i);
 316         }
 317 #endif
 318 }
 319
 320 static void __init finalize_initrd(void)
 321 {
 322         unsigned long size = initrd_end - initrd_start;
 323
 324         if (size == 0) {
 325                 printk(KERN_INFO "Initrd not found or empty");
 326                 goto disable;
 327         }
 328         if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
 329                 printk(KERN_ERR "Initrd extends beyond end of memory");
 330                 goto disable;
 331         }
 332
 333         maybe_bswap_initrd();
 334
 335         memblock_reserve(__pa(initrd_start), size);
 336         initrd_below_start_ok = 1;
 337
 338         pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
 339                 initrd_start, size);
 340         return;
 341 disable:
 342         printk(KERN_CONT " - disabling initrd\n");
 343         initrd_start = 0;
 344         initrd_end = 0;
 345 }
 346
 347 #else  /* !CONFIG_BLK_DEV_INITRD */
 348
 349 static unsigned long __init init_initrd(void)
 350 {
 351         return 0;
 352 }
 353
 354 #define finalize_initrd()       do {} while (0)
 355
 356 #endif
 357
 358 /*
 359  * Initialize the bootmem allocator. It also setup initrd related data
 360  * if needed.
 361  */
 362 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
 363
 364 static void __init bootmem_init(void)
 365 {
 366         init_initrd();
 367         finalize_initrd();
 368 }
 369
 370 #else  /* !CONFIG_SGI_IP27 */
 371
 372 static void __init bootmem_init(void)
 373 {
 374         unsigned long reserved_end;
 375         phys_addr_t ramstart = PHYS_ADDR_MAX;
 376         int i;
 377
 378         /*
 379          * Sanity check any INITRD first. We don't take it into account
 380          * for bootmem setup initially, rely on the end-of-kernel-code
 381          * as our memory range starting point. Once bootmem is inited we
 382          * will reserve the area used for the initrd.
 383          */
 384         init_initrd();
 385         reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
 386
 387         memblock_reserve(PHYS_OFFSET, reserved_end << PAGE_SHIFT);
 388
 389         /*
 390          * max_low_pfn is not a number of pages. The number of pages
 391          * of the system is given by 'max_low_pfn - min_low_pfn'.
 392          */
 393         min_low_pfn = ~0UL;
 394         max_low_pfn = 0;
 395
 396         /*
 397          * Find the highest page frame number we have available
 398          * and the lowest used RAM address
 399          */
 400         for (i = 0; i < boot_mem_map.nr_map; i++) {
 401                 unsigned long start, end;
 402
 403                 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
 404                         continue;
 405
 406                 start = PFN_UP(boot_mem_map.map[i].addr);
 407                 end = PFN_DOWN(boot_mem_map.map[i].addr
 408                                 + boot_mem_map.map[i].size);
 409
 410                 ramstart = min(ramstart, boot_mem_map.map[i].addr);
 411
 412 #ifndef CONFIG_HIGHMEM
 413                 /*
 414                  * Skip highmem here so we get an accurate max_low_pfn if low
 415                  * memory stops short of high memory.
 416                  * If the region overlaps HIGHMEM_START, end is clipped so
 417                  * max_pfn excludes the highmem portion.
 418                  */
 419                 if (start >= PFN_DOWN(HIGHMEM_START))
 420                         continue;
 421                 if (end > PFN_DOWN(HIGHMEM_START))
 422                         end = PFN_DOWN(HIGHMEM_START);
 423 #endif
 424
 425                 if (end > max_low_pfn)
 426                         max_low_pfn = end;
 427                 if (start < min_low_pfn)
 428                         min_low_pfn = start;
 429                 if (end <= reserved_end)
 430                         continue;
 431 #ifdef CONFIG_BLK_DEV_INITRD
 432                 /* Skip zones before initrd and initrd itself */
 433                 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
 434                         continue;
 435 #endif
 436         }
 437
 438         if (min_low_pfn >= max_low_pfn)
 439                 panic("Incorrect memory mapping !!!");
 440
 441 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
 442         ARCH_PFN_OFFSET = PFN_UP(ramstart);
 443 #else
 444         /*
 445          * Reserve any memory between the start of RAM and PHYS_OFFSET
 446          */
 447         if (ramstart > PHYS_OFFSET) {
 448                 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
 449                                   BOOT_MEM_RESERVED);
 450                 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
 451         }
 452
 453         if (min_low_pfn > ARCH_PFN_OFFSET) {
 454                 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
 455                         (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
 456                         min_low_pfn - ARCH_PFN_OFFSET);
 457         } else if (ARCH_PFN_OFFSET - min_low_pfn > 0UL) {
 458                 pr_info("%lu free pages won't be used\n",
 459                         ARCH_PFN_OFFSET - min_low_pfn);
 460         }
 461         min_low_pfn = ARCH_PFN_OFFSET;
 462 #endif
 463
 464         /*
 465          * Determine low and high memory ranges
 466          */
 467         max_pfn = max_low_pfn;
 468         if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
 469 #ifdef CONFIG_HIGHMEM
 470                 highstart_pfn = PFN_DOWN(HIGHMEM_START);
 471                 highend_pfn = max_low_pfn;
 472 #endif
 473                 max_low_pfn = PFN_DOWN(HIGHMEM_START);
 474         }
 475
 476         for (i = 0; i < boot_mem_map.nr_map; i++) {
 477                 unsigned long start, end;
 478
 479                 start = PFN_UP(boot_mem_map.map[i].addr);
 480                 end = PFN_DOWN(boot_mem_map.map[i].addr
 481                                 + boot_mem_map.map[i].size);
 482
 483                 if (start <= min_low_pfn)
 484                         start = min_low_pfn;
 485                 if (start >= end)
 486                         continue;
 487
 488 #ifndef CONFIG_HIGHMEM
 489                 if (end > max_low_pfn)
 490                         end = max_low_pfn;
 491
 492                 /*
 493                  * ... finally, is the area going away?
 494                  */
 495                 if (end <= start)
 496                         continue;
 497 #endif
 498
 499                 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
 500         }
 501
 502         /*
 503          * Register fully available low RAM pages with the bootmem allocator.
 504          */
 505         for (i = 0; i < boot_mem_map.nr_map; i++) {
 506                 unsigned long start, end, size;
 507
 508                 start = PFN_UP(boot_mem_map.map[i].addr);
 509                 end   = PFN_DOWN(boot_mem_map.map[i].addr
 510                                     + boot_mem_map.map[i].size);
 511
 512                 /*
 513                  * Reserve usable memory.
 514                  */
 515                 switch (boot_mem_map.map[i].type) {
 516                 case BOOT_MEM_RAM:
 517                         break;
 518                 case BOOT_MEM_INIT_RAM:
 519                         memory_present(0, start, end);
 520                         continue;
 521                 default:
 522                         /* Not usable memory */
 523                         if (start > min_low_pfn && end < max_low_pfn)
 524                                 memblock_reserve(boot_mem_map.map[i].addr,
 525                                                 boot_mem_map.map[i].size);
 526
 527                         continue;
 528                 }
 529
 530                 /*
 531                  * We are rounding up the start address of usable memory
 532                  * and at the end of the usable range downwards.
 533                  */
 534                 if (start >= max_low_pfn)
 535                         continue;
 536                 if (start < reserved_end)
 537                         start = reserved_end;
 538                 if (end > max_low_pfn)
 539                         end = max_low_pfn;
 540
 541                 /*
 542                  * ... finally, is the area going away?
 543                  */
 544                 if (end <= start)
 545                         continue;
 546                 size = end - start;
 547
 548                 /* Register lowmem ranges */
 549                 memory_present(0, start, end);
 550         }
 551
 552 #ifdef CONFIG_RELOCATABLE
 553         /*
 554          * The kernel reserves all memory below its _end symbol as bootmem,
 555          * but the kernel may now be at a much higher address. The memory
 556          * between the original and new locations may be returned to the system.
 557          */
 558         if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
 559                 unsigned long offset;
 560                 extern void show_kernel_relocation(const char *level);
 561
 562                 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
 563                 memblock_free(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
 564
 565 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
 566                 /*
 567                  * This information is necessary when debugging the kernel
 568                  * But is a security vulnerability otherwise!
 569                  */
 570                 show_kernel_relocation(KERN_INFO);
 571 #endif
 572         }
 573 #endif
 574
 575         /*
 576          * Reserve initrd memory if needed.
 577          */
 578         finalize_initrd();
 579 }
 580
 581 #endif  /* CONFIG_SGI_IP27 */
 582
 583 static int usermem __initdata;
 584
 585 static int __init early_parse_mem(char *p)
 586 {
 587         phys_addr_t start, size;
 588
 589         /*
 590          * If a user specifies memory size, we
 591          * blow away any automatically generated
 592          * size.
 593          */
 594         if (usermem == 0) {
 595                 boot_mem_map.nr_map = 0;
 596                 usermem = 1;
 597         }
 598         start = 0;
 599         size = memparse(p, &p);
 600         if (*p == '@')
 601                 start = memparse(p + 1, &p);
 602
 603         add_memory_region(start, size, BOOT_MEM_RAM);
 604
 605         return 0;
 606 }
 607 early_param("mem", early_parse_mem);
 608
 609 static int __init early_parse_memmap(char *p)
 610 {
 611         char *oldp;
 612         u64 start_at, mem_size;
 613
 614         if (!p)
 615                 return -EINVAL;
 616
 617         if (!strncmp(p, "exactmap", 8)) {
 618                 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
 619                 return 0;
 620         }
 621
 622         oldp = p;
 623         mem_size = memparse(p, &p);
 624         if (p == oldp)
 625                 return -EINVAL;
 626
 627         if (*p == '@') {
 628                 start_at = memparse(p+1, &p);
 629                 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
 630         } else if (*p == '#') {
 631                 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
 632                 return -EINVAL;
 633         } else if (*p == '$') {
 634                 start_at = memparse(p+1, &p);
 635                 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
 636         } else {
 637                 pr_err("\"memmap\" invalid format!\n");
 638                 return -EINVAL;
 639         }
 640
 641         if (*p == '\0') {
 642                 usermem = 1;
 643                 return 0;
 644         } else
 645                 return -EINVAL;
 646 }
 647 early_param("memmap", early_parse_memmap);
 648
 649 #ifdef CONFIG_PROC_VMCORE
 650 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
 651 static int __init early_parse_elfcorehdr(char *p)
 652 {
 653         int i;
 654
 655         setup_elfcorehdr = memparse(p, &p);
 656
 657         for (i = 0; i < boot_mem_map.nr_map; i++) {
 658                 unsigned long start = boot_mem_map.map[i].addr;
 659                 unsigned long end = (boot_mem_map.map[i].addr +
 660                                      boot_mem_map.map[i].size);
 661                 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
 662                         /*
 663                          * Reserve from the elf core header to the end of
 664                          * the memory segment, that should all be kdump
 665                          * reserved memory.
 666                          */
 667                         setup_elfcorehdr_size = end - setup_elfcorehdr;
 668                         break;
 669                 }
 670         }
 671         /*
 672          * If we don't find it in the memory map, then we shouldn't
 673          * have to worry about it, as the new kernel won't use it.
 674          */
 675         return 0;
 676 }
 677 early_param("elfcorehdr", early_parse_elfcorehdr);
 678 #endif
 679
 680 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
 681 {
 682         phys_addr_t size;
 683         int i;
 684
 685         size = end - mem;
 686         if (!size)
 687                 return;
 688
 689         /* Make sure it is in the boot_mem_map */
 690         for (i = 0; i < boot_mem_map.nr_map; i++) {
 691                 if (mem >= boot_mem_map.map[i].addr &&
 692                     mem < (boot_mem_map.map[i].addr +
 693                            boot_mem_map.map[i].size))
 694                         return;
 695         }
 696         add_memory_region(mem, size, type);
 697 }
 698
 699 #ifdef CONFIG_KEXEC
 700 static inline unsigned long long get_total_mem(void)
 701 {
 702         unsigned long long total;
 703
 704         total = max_pfn - min_low_pfn;
 705         return total << PAGE_SHIFT;
 706 }
 707
 708 static void __init mips_parse_crashkernel(void)
 709 {
 710         unsigned long long total_mem;
 711         unsigned long long crash_size, crash_base;
 712         int ret;
 713
 714         total_mem = get_total_mem();
 715         ret = parse_crashkernel(boot_command_line, total_mem,
 716                                 &crash_size, &crash_base);
 717         if (ret != 0 || crash_size <= 0)
 718                 return;
 719
 720         if (!memory_region_available(crash_base, crash_size)) {
 721                 pr_warn("Invalid memory region reserved for crash kernel\n");
 722                 return;
 723         }
 724
 725         crashk_res.start = crash_base;
 726         crashk_res.end   = crash_base + crash_size - 1;
 727 }
 728
 729 static void __init request_crashkernel(struct resource *res)
 730 {
 731         int ret;
 732
 733         if (crashk_res.start == crashk_res.end)
 734                 return;
 735
 736         ret = request_resource(res, &crashk_res);
 737         if (!ret)
 738                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
 739                         (unsigned long)((crashk_res.end -
 740                                          crashk_res.start + 1) >> 20),
 741                         (unsigned long)(crashk_res.start  >> 20));
 742 }
 743 #else /* !defined(CONFIG_KEXEC)         */
 744 static void __init mips_parse_crashkernel(void)
 745 {
 746 }
 747
 748 static void __init request_crashkernel(struct resource *res)
 749 {
 750 }
 751 #endif /* !defined(CONFIG_KEXEC)  */
 752
 753 #define USE_PROM_CMDLINE        IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
 754 #define USE_DTB_CMDLINE         IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
 755 #define EXTEND_WITH_PROM        IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
 756 #define BUILTIN_EXTEND_WITH_PROM        \
 757         IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
 758
 759 /*
 760  * arch_mem_init - initialize memory management subsystem
 761  *
 762  *  o plat_mem_setup() detects the memory configuration and will record detected
 763  *    memory areas using add_memory_region.
 764  *
 765  * At this stage the memory configuration of the system is known to the
 766  * kernel but generic memory management system is still entirely uninitialized.
 767  *
 768  *  o bootmem_init()
 769  *  o sparse_init()
 770  *  o paging_init()
 771  *  o dma_contiguous_reserve()
 772  *
 773  * At this stage the bootmem allocator is ready to use.
 774  *
 775  * NOTE: historically plat_mem_setup did the entire platform initialization.
 776  *       This was rather impractical because it meant plat_mem_setup had to
 777  * get away without any kind of memory allocator.  To keep old code from
 778  * breaking plat_setup was just renamed to plat_mem_setup and a second platform
 779  * initialization hook for anything else was introduced.
 780  */
 781 static void __init arch_mem_init(char **cmdline_p)
 782 {
 783         struct memblock_region *reg;
 784         extern void plat_mem_setup(void);
 785
 786         /*
 787          * Initialize boot_command_line to an innocuous but non-empty string in
 788          * order to prevent early_init_dt_scan_chosen() from copying
 789          * CONFIG_CMDLINE into it without our knowledge. We handle
 790          * CONFIG_CMDLINE ourselves below & don't want to duplicate its
 791          * content because repeating arguments can be problematic.
 792          */
 793         strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE);
 794
 795         /* call board setup routine */
 796         plat_mem_setup();
 797         memblock_set_bottom_up(true);
 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 = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
 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