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/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 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type) 88 { 89 int x = boot_mem_map.nr_map; 90 int i; 91 92 /* 93 * If the region reaches the top of the physical address space, adjust 94 * the size slightly so that (start + size) doesn't overflow 95 */ 96 if (start + size - 1 == PHYS_ADDR_MAX) 97 --size; 98 99 /* Sanity check */ 100 if (start + size < start) { 101 pr_warn("Trying to add an invalid memory region, skipped\n"); 102 return; 103 } 104 105 /* 106 * Try to merge with existing entry, if any. 107 */ 108 for (i = 0; i < boot_mem_map.nr_map; i++) { 109 struct boot_mem_map_entry *entry = boot_mem_map.map + i; 110 unsigned long top; 111 112 if (entry->type != type) 113 continue; 114 115 if (start + size < entry->addr) 116 continue; /* no overlap */ 117 118 if (entry->addr + entry->size < start) 119 continue; /* no overlap */ 120 121 top = max(entry->addr + entry->size, start + size); 122 entry->addr = min(entry->addr, start); 123 entry->size = top - entry->addr; 124 125 return; 126 } 127 128 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) { 129 pr_err("Ooops! Too many entries in the memory map!\n"); 130 return; 131 } 132 133 boot_mem_map.map[x].addr = start; 134 boot_mem_map.map[x].size = size; 135 boot_mem_map.map[x].type = type; 136 boot_mem_map.nr_map++; 137 } 138 139 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 140 { 141 void *dm = &detect_magic; 142 phys_addr_t size; 143 144 for (size = sz_min; size < sz_max; size <<= 1) { 145 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 146 break; 147 } 148 149 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 150 ((unsigned long long) size) / SZ_1M, 151 (unsigned long long) start, 152 ((unsigned long long) sz_min) / SZ_1M, 153 ((unsigned long long) sz_max) / SZ_1M); 154 155 add_memory_region(start, size, BOOT_MEM_RAM); 156 } 157 158 static bool __init __maybe_unused memory_region_available(phys_addr_t start, 159 phys_addr_t size) 160 { 161 int i; 162 bool in_ram = false, free = true; 163 164 for (i = 0; i < boot_mem_map.nr_map; i++) { 165 phys_addr_t start_, end_; 166 167 start_ = boot_mem_map.map[i].addr; 168 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size; 169 170 switch (boot_mem_map.map[i].type) { 171 case BOOT_MEM_RAM: 172 if (start >= start_ && start + size <= end_) 173 in_ram = true; 174 break; 175 case BOOT_MEM_RESERVED: 176 if ((start >= start_ && start < end_) || 177 (start < start_ && start + size >= start_)) 178 free = false; 179 break; 180 default: 181 continue; 182 } 183 } 184 185 return in_ram && free; 186 } 187 188 static void __init print_memory_map(void) 189 { 190 int i; 191 const int field = 2 * sizeof(unsigned long); 192 193 for (i = 0; i < boot_mem_map.nr_map; i++) { 194 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ", 195 field, (unsigned long long) boot_mem_map.map[i].size, 196 field, (unsigned long long) boot_mem_map.map[i].addr); 197 198 switch (boot_mem_map.map[i].type) { 199 case BOOT_MEM_RAM: 200 printk(KERN_CONT "(usable)\n"); 201 break; 202 case BOOT_MEM_INIT_RAM: 203 printk(KERN_CONT "(usable after init)\n"); 204 break; 205 case BOOT_MEM_ROM_DATA: 206 printk(KERN_CONT "(ROM data)\n"); 207 break; 208 case BOOT_MEM_RESERVED: 209 printk(KERN_CONT "(reserved)\n"); 210 break; 211 default: 212 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type); 213 break; 214 } 215 } 216 } 217 218 /* 219 * Manage initrd 220 */ 221 #ifdef CONFIG_BLK_DEV_INITRD 222 223 static int __init rd_start_early(char *p) 224 { 225 unsigned long start = memparse(p, &p); 226 227 #ifdef CONFIG_64BIT 228 /* Guess if the sign extension was forgotten by bootloader */ 229 if (start < XKPHYS) 230 start = (int)start; 231 #endif 232 initrd_start = start; 233 initrd_end += start; 234 return 0; 235 } 236 early_param("rd_start", rd_start_early); 237 238 static int __init rd_size_early(char *p) 239 { 240 initrd_end += memparse(p, &p); 241 return 0; 242 } 243 early_param("rd_size", rd_size_early); 244 245 /* it returns the next free pfn after initrd */ 246 static unsigned long __init init_initrd(void) 247 { 248 unsigned long end; 249 250 /* 251 * Board specific code or command line parser should have 252 * already set up initrd_start and initrd_end. In these cases 253 * perfom sanity checks and use them if all looks good. 254 */ 255 if (!initrd_start || initrd_end <= initrd_start) 256 goto disable; 257 258 if (initrd_start & ~PAGE_MASK) { 259 pr_err("initrd start must be page aligned\n"); 260 goto disable; 261 } 262 if (initrd_start < PAGE_OFFSET) { 263 pr_err("initrd start < PAGE_OFFSET\n"); 264 goto disable; 265 } 266 267 /* 268 * Sanitize initrd addresses. For example firmware 269 * can't guess if they need to pass them through 270 * 64-bits values if the kernel has been built in pure 271 * 32-bit. We need also to switch from KSEG0 to XKPHYS 272 * addresses now, so the code can now safely use __pa(). 273 */ 274 end = __pa(initrd_end); 275 initrd_end = (unsigned long)__va(end); 276 initrd_start = (unsigned long)__va(__pa(initrd_start)); 277 278 ROOT_DEV = Root_RAM0; 279 return PFN_UP(end); 280 disable: 281 initrd_start = 0; 282 initrd_end = 0; 283 return 0; 284 } 285 286 /* In some conditions (e.g. big endian bootloader with a little endian 287 kernel), the initrd might appear byte swapped. Try to detect this and 288 byte swap it if needed. */ 289 static void __init maybe_bswap_initrd(void) 290 { 291 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 292 u64 buf; 293 294 /* Check for CPIO signature */ 295 if (!memcmp((void *)initrd_start, "070701", 6)) 296 return; 297 298 /* Check for compressed initrd */ 299 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 300 return; 301 302 /* Try again with a byte swapped header */ 303 buf = swab64p((u64 *)initrd_start); 304 if (!memcmp(&buf, "070701", 6) || 305 decompress_method((unsigned char *)(&buf), 8, NULL)) { 306 unsigned long i; 307 308 pr_info("Byteswapped initrd detected\n"); 309 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 310 swab64s((u64 *)i); 311 } 312 #endif 313 } 314 315 static void __init finalize_initrd(void) 316 { 317 unsigned long size = initrd_end - initrd_start; 318 319 if (size == 0) { 320 printk(KERN_INFO "Initrd not found or empty"); 321 goto disable; 322 } 323 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 324 printk(KERN_ERR "Initrd extends beyond end of memory"); 325 goto disable; 326 } 327 328 maybe_bswap_initrd(); 329 330 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT); 331 initrd_below_start_ok = 1; 332 333 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 334 initrd_start, size); 335 return; 336 disable: 337 printk(KERN_CONT " - disabling initrd\n"); 338 initrd_start = 0; 339 initrd_end = 0; 340 } 341 342 #else /* !CONFIG_BLK_DEV_INITRD */ 343 344 static unsigned long __init init_initrd(void) 345 { 346 return 0; 347 } 348 349 #define finalize_initrd() do {} while (0) 350 351 #endif 352 353 /* 354 * Initialize the bootmem allocator. It also setup initrd related data 355 * if needed. 356 */ 357 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA)) 358 359 static void __init bootmem_init(void) 360 { 361 init_initrd(); 362 finalize_initrd(); 363 } 364 365 #else /* !CONFIG_SGI_IP27 */ 366 367 static unsigned long __init bootmap_bytes(unsigned long pages) 368 { 369 unsigned long bytes = DIV_ROUND_UP(pages, 8); 370 371 return ALIGN(bytes, sizeof(long)); 372 } 373 374 static void __init bootmem_init(void) 375 { 376 unsigned long reserved_end; 377 unsigned long mapstart = ~0UL; 378 unsigned long bootmap_size; 379 phys_addr_t ramstart = PHYS_ADDR_MAX; 380 bool bootmap_valid = false; 381 int i; 382 383 /* 384 * Sanity check any INITRD first. We don't take it into account 385 * for bootmem setup initially, rely on the end-of-kernel-code 386 * as our memory range starting point. Once bootmem is inited we 387 * will reserve the area used for the initrd. 388 */ 389 init_initrd(); 390 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end)); 391 392 /* 393 * max_low_pfn is not a number of pages. The number of pages 394 * of the system is given by 'max_low_pfn - min_low_pfn'. 395 */ 396 min_low_pfn = ~0UL; 397 max_low_pfn = 0; 398 399 /* 400 * Find the highest page frame number we have available 401 * and the lowest used RAM address 402 */ 403 for (i = 0; i < boot_mem_map.nr_map; i++) { 404 unsigned long start, end; 405 406 if (boot_mem_map.map[i].type != BOOT_MEM_RAM) 407 continue; 408 409 start = PFN_UP(boot_mem_map.map[i].addr); 410 end = PFN_DOWN(boot_mem_map.map[i].addr 411 + boot_mem_map.map[i].size); 412 413 ramstart = min(ramstart, boot_mem_map.map[i].addr); 414 415 #ifndef CONFIG_HIGHMEM 416 /* 417 * Skip highmem here so we get an accurate max_low_pfn if low 418 * memory stops short of high memory. 419 * If the region overlaps HIGHMEM_START, end is clipped so 420 * max_pfn excludes the highmem portion. 421 */ 422 if (start >= PFN_DOWN(HIGHMEM_START)) 423 continue; 424 if (end > PFN_DOWN(HIGHMEM_START)) 425 end = PFN_DOWN(HIGHMEM_START); 426 #endif 427 428 if (end > max_low_pfn) 429 max_low_pfn = end; 430 if (start < min_low_pfn) 431 min_low_pfn = start; 432 if (end <= reserved_end) 433 continue; 434 #ifdef CONFIG_BLK_DEV_INITRD 435 /* Skip zones before initrd and initrd itself */ 436 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end))) 437 continue; 438 #endif 439 if (start >= mapstart) 440 continue; 441 mapstart = max(reserved_end, start); 442 } 443 444 /* 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); 450 451 if (min_low_pfn >= max_low_pfn) 452 panic("Incorrect memory mapping !!!"); 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; 462 463 /* 464 * Determine low and high memory ranges 465 */ 466 max_pfn = max_low_pfn; 467 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) { 468 #ifdef CONFIG_HIGHMEM 469 highstart_pfn = PFN_DOWN(HIGHMEM_START); 470 highend_pfn = max_low_pfn; 471 #endif 472 max_low_pfn = PFN_DOWN(HIGHMEM_START); 473 } 474 475 #ifdef CONFIG_BLK_DEV_INITRD 476 /* 477 * mapstart should be after initrd_end 478 */ 479 if (initrd_end) 480 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end))); 481 #endif 482 483 /* 484 * check that mapstart doesn't overlap with any of 485 * memory regions that have been reserved through eg. DTB 486 */ 487 bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn); 488 489 bootmap_valid = memory_region_available(PFN_PHYS(mapstart), 490 bootmap_size); 491 for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) { 492 unsigned long mapstart_addr; 493 494 switch (boot_mem_map.map[i].type) { 495 case BOOT_MEM_RESERVED: 496 mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr + 497 boot_mem_map.map[i].size); 498 if (PHYS_PFN(mapstart_addr) < mapstart) 499 break; 500 501 bootmap_valid = memory_region_available(mapstart_addr, 502 bootmap_size); 503 if (bootmap_valid) 504 mapstart = PHYS_PFN(mapstart_addr); 505 break; 506 default: 507 break; 508 } 509 } 510 511 if (!bootmap_valid) 512 panic("No memory area to place a bootmap bitmap"); 513 514 /* 515 * Initialize the boot-time allocator with low memory only. 516 */ 517 if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart, 518 min_low_pfn, max_low_pfn)) 519 panic("Unexpected memory size required for bootmap"); 520 521 for (i = 0; i < boot_mem_map.nr_map; i++) { 522 unsigned long start, end; 523 524 start = PFN_UP(boot_mem_map.map[i].addr); 525 end = PFN_DOWN(boot_mem_map.map[i].addr 526 + boot_mem_map.map[i].size); 527 528 if (start <= min_low_pfn) 529 start = min_low_pfn; 530 if (start >= end) 531 continue; 532 533 #ifndef CONFIG_HIGHMEM 534 if (end > max_low_pfn) 535 end = max_low_pfn; 536 537 /* 538 * ... finally, is the area going away? 539 */ 540 if (end <= start) 541 continue; 542 #endif 543 544 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0); 545 } 546 547 /* 548 * Register fully available low RAM pages with the bootmem allocator. 549 */ 550 for (i = 0; i < boot_mem_map.nr_map; i++) { 551 unsigned long start, end, size; 552 553 start = PFN_UP(boot_mem_map.map[i].addr); 554 end = PFN_DOWN(boot_mem_map.map[i].addr 555 + boot_mem_map.map[i].size); 556 557 /* 558 * Reserve usable memory. 559 */ 560 switch (boot_mem_map.map[i].type) { 561 case BOOT_MEM_RAM: 562 break; 563 case BOOT_MEM_INIT_RAM: 564 memory_present(0, start, end); 565 continue; 566 default: 567 /* Not usable memory */ 568 if (start > min_low_pfn && end < max_low_pfn) 569 reserve_bootmem(boot_mem_map.map[i].addr, 570 boot_mem_map.map[i].size, 571 BOOTMEM_DEFAULT); 572 continue; 573 } 574 575 /* 576 * We are rounding up the start address of usable memory 577 * and at the end of the usable range downwards. 578 */ 579 if (start >= max_low_pfn) 580 continue; 581 if (start < reserved_end) 582 start = reserved_end; 583 if (end > max_low_pfn) 584 end = max_low_pfn; 585 586 /* 587 * ... finally, is the area going away? 588 */ 589 if (end <= start) 590 continue; 591 size = end - start; 592 593 /* Register lowmem ranges */ 594 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT); 595 memory_present(0, start, end); 596 } 597 598 /* 599 * Reserve the bootmap memory. 600 */ 601 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT); 602 603 #ifdef CONFIG_RELOCATABLE 604 /* 605 * The kernel reserves all memory below its _end symbol as bootmem, 606 * but the kernel may now be at a much higher address. The memory 607 * between the original and new locations may be returned to the system. 608 */ 609 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) { 610 unsigned long offset; 611 extern void show_kernel_relocation(const char *level); 612 613 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS); 614 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset); 615 616 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO) 617 /* 618 * This information is necessary when debugging the kernel 619 * But is a security vulnerability otherwise! 620 */ 621 show_kernel_relocation(KERN_INFO); 622 #endif 623 } 624 #endif 625 626 /* 627 * Reserve initrd memory if needed. 628 */ 629 finalize_initrd(); 630 } 631 632 #endif /* CONFIG_SGI_IP27 */ 633 634 /* 635 * arch_mem_init - initialize memory management subsystem 636 * 637 * o plat_mem_setup() detects the memory configuration and will record detected 638 * memory areas using add_memory_region. 639 * 640 * At this stage the memory configuration of the system is known to the 641 * kernel but generic memory management system is still entirely uninitialized. 642 * 643 * o bootmem_init() 644 * o sparse_init() 645 * o paging_init() 646 * o dma_contiguous_reserve() 647 * 648 * At this stage the bootmem allocator is ready to use. 649 * 650 * NOTE: historically plat_mem_setup did the entire platform initialization. 651 * This was rather impractical because it meant plat_mem_setup had to 652 * get away without any kind of memory allocator. To keep old code from 653 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 654 * initialization hook for anything else was introduced. 655 */ 656 657 static int usermem __initdata; 658 659 static int __init early_parse_mem(char *p) 660 { 661 phys_addr_t start, size; 662 663 /* 664 * If a user specifies memory size, we 665 * blow away any automatically generated 666 * size. 667 */ 668 if (usermem == 0) { 669 boot_mem_map.nr_map = 0; 670 usermem = 1; 671 } 672 start = 0; 673 size = memparse(p, &p); 674 if (*p == '@') 675 start = memparse(p + 1, &p); 676 677 add_memory_region(start, size, BOOT_MEM_RAM); 678 679 return 0; 680 } 681 early_param("mem", early_parse_mem); 682 683 static int __init early_parse_memmap(char *p) 684 { 685 char *oldp; 686 u64 start_at, mem_size; 687 688 if (!p) 689 return -EINVAL; 690 691 if (!strncmp(p, "exactmap", 8)) { 692 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 693 return 0; 694 } 695 696 oldp = p; 697 mem_size = memparse(p, &p); 698 if (p == oldp) 699 return -EINVAL; 700 701 if (*p == '@') { 702 start_at = memparse(p+1, &p); 703 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 704 } else if (*p == '#') { 705 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 706 return -EINVAL; 707 } else if (*p == '$') { 708 start_at = memparse(p+1, &p); 709 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED); 710 } else { 711 pr_err("\"memmap\" invalid format!\n"); 712 return -EINVAL; 713 } 714 715 if (*p == '\0') { 716 usermem = 1; 717 return 0; 718 } else 719 return -EINVAL; 720 } 721 early_param("memmap", early_parse_memmap); 722 723 #ifdef CONFIG_PROC_VMCORE 724 unsigned long setup_elfcorehdr, setup_elfcorehdr_size; 725 static int __init early_parse_elfcorehdr(char *p) 726 { 727 int i; 728 729 setup_elfcorehdr = memparse(p, &p); 730 731 for (i = 0; i < boot_mem_map.nr_map; i++) { 732 unsigned long start = boot_mem_map.map[i].addr; 733 unsigned long end = (boot_mem_map.map[i].addr + 734 boot_mem_map.map[i].size); 735 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) { 736 /* 737 * Reserve from the elf core header to the end of 738 * the memory segment, that should all be kdump 739 * reserved memory. 740 */ 741 setup_elfcorehdr_size = end - setup_elfcorehdr; 742 break; 743 } 744 } 745 /* 746 * If we don't find it in the memory map, then we shouldn't 747 * have to worry about it, as the new kernel won't use it. 748 */ 749 return 0; 750 } 751 early_param("elfcorehdr", early_parse_elfcorehdr); 752 #endif 753 754 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type) 755 { 756 phys_addr_t size; 757 int i; 758 759 size = end - mem; 760 if (!size) 761 return; 762 763 /* Make sure it is in the boot_mem_map */ 764 for (i = 0; i < boot_mem_map.nr_map; i++) { 765 if (mem >= boot_mem_map.map[i].addr && 766 mem < (boot_mem_map.map[i].addr + 767 boot_mem_map.map[i].size)) 768 return; 769 } 770 add_memory_region(mem, size, type); 771 } 772 773 #ifdef CONFIG_KEXEC 774 static inline unsigned long long get_total_mem(void) 775 { 776 unsigned long long total; 777 778 total = max_pfn - min_low_pfn; 779 return total << PAGE_SHIFT; 780 } 781 782 static void __init mips_parse_crashkernel(void) 783 { 784 unsigned long long total_mem; 785 unsigned long long crash_size, crash_base; 786 int ret; 787 788 total_mem = get_total_mem(); 789 ret = parse_crashkernel(boot_command_line, total_mem, 790 &crash_size, &crash_base); 791 if (ret != 0 || crash_size <= 0) 792 return; 793 794 if (!memory_region_available(crash_base, crash_size)) { 795 pr_warn("Invalid memory region reserved for crash kernel\n"); 796 return; 797 } 798 799 crashk_res.start = crash_base; 800 crashk_res.end = crash_base + crash_size - 1; 801 } 802 803 static void __init request_crashkernel(struct resource *res) 804 { 805 int ret; 806 807 if (crashk_res.start == crashk_res.end) 808 return; 809 810 ret = request_resource(res, &crashk_res); 811 if (!ret) 812 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 813 (unsigned long)((crashk_res.end - 814 crashk_res.start + 1) >> 20), 815 (unsigned long)(crashk_res.start >> 20)); 816 } 817 #else /* !defined(CONFIG_KEXEC) */ 818 static void __init mips_parse_crashkernel(void) 819 { 820 } 821 822 static void __init request_crashkernel(struct resource *res) 823 { 824 } 825 #endif /* !defined(CONFIG_KEXEC) */ 826 827 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER) 828 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) 829 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) 830 #define BUILTIN_EXTEND_WITH_PROM \ 831 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND) 832 833 static void __init arch_mem_init(char **cmdline_p) 834 { 835 struct memblock_region *reg; 836 extern void plat_mem_setup(void); 837 838 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE) 839 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 840 #else 841 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) || 842 (USE_DTB_CMDLINE && !boot_command_line[0])) 843 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 844 845 if (EXTEND_WITH_PROM && arcs_cmdline[0]) { 846 if (boot_command_line[0]) 847 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 848 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 849 } 850 851 #if defined(CONFIG_CMDLINE_BOOL) 852 if (builtin_cmdline[0]) { 853 if (boot_command_line[0]) 854 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 855 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 856 } 857 858 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) { 859 if (boot_command_line[0]) 860 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 861 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 862 } 863 #endif 864 #endif 865 866 /* call board setup routine */ 867 plat_mem_setup(); 868 869 /* 870 * Make sure all kernel memory is in the maps. The "UP" and 871 * "DOWN" are opposite for initdata since if it crosses over 872 * into another memory section you don't want that to be 873 * freed when the initdata is freed. 874 */ 875 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT, 876 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT, 877 BOOT_MEM_RAM); 878 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT, 879 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT, 880 BOOT_MEM_INIT_RAM); 881 882 pr_info("Determined physical RAM map:\n"); 883 print_memory_map(); 884 885 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 886 887 *cmdline_p = command_line; 888 889 parse_early_param(); 890 891 if (usermem) { 892 pr_info("User-defined physical RAM map:\n"); 893 print_memory_map(); 894 } 895 896 early_init_fdt_reserve_self(); 897 early_init_fdt_scan_reserved_mem(); 898 899 bootmem_init(); 900 #ifdef CONFIG_PROC_VMCORE 901 if (setup_elfcorehdr && setup_elfcorehdr_size) { 902 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", 903 setup_elfcorehdr, setup_elfcorehdr_size); 904 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size, 905 BOOTMEM_DEFAULT); 906 } 907 #endif 908 909 mips_parse_crashkernel(); 910 #ifdef CONFIG_KEXEC 911 if (crashk_res.start != crashk_res.end) 912 reserve_bootmem(crashk_res.start, 913 crashk_res.end - crashk_res.start + 1, 914 BOOTMEM_DEFAULT); 915 #endif 916 device_tree_init(); 917 sparse_init(); 918 plat_swiotlb_setup(); 919 920 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 921 /* Tell bootmem about cma reserved memblock section */ 922 for_each_memblock(reserved, reg) 923 if (reg->size != 0) 924 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); 925 926 reserve_bootmem_region(__pa_symbol(&__nosave_begin), 927 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */ 928 } 929 930 static void __init resource_init(void) 931 { 932 int i; 933 934 if (UNCAC_BASE != IO_BASE) 935 return; 936 937 code_resource.start = __pa_symbol(&_text); 938 code_resource.end = __pa_symbol(&_etext) - 1; 939 data_resource.start = __pa_symbol(&_etext); 940 data_resource.end = __pa_symbol(&_edata) - 1; 941 bss_resource.start = __pa_symbol(&__bss_start); 942 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 943 944 for (i = 0; i < boot_mem_map.nr_map; i++) { 945 struct resource *res; 946 unsigned long start, end; 947 948 start = boot_mem_map.map[i].addr; 949 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; 950 if (start >= HIGHMEM_START) 951 continue; 952 if (end >= HIGHMEM_START) 953 end = HIGHMEM_START - 1; 954 955 res = alloc_bootmem(sizeof(struct resource)); 956 957 res->start = start; 958 res->end = end; 959 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 960 961 switch (boot_mem_map.map[i].type) { 962 case BOOT_MEM_RAM: 963 case BOOT_MEM_INIT_RAM: 964 case BOOT_MEM_ROM_DATA: 965 res->name = "System RAM"; 966 res->flags |= IORESOURCE_SYSRAM; 967 break; 968 case BOOT_MEM_RESERVED: 969 default: 970 res->name = "reserved"; 971 } 972 973 request_resource(&iomem_resource, res); 974 975 /* 976 * We don't know which RAM region contains kernel data, 977 * so we try it repeatedly and let the resource manager 978 * test it. 979 */ 980 request_resource(res, &code_resource); 981 request_resource(res, &data_resource); 982 request_resource(res, &bss_resource); 983 request_crashkernel(res); 984 } 985 } 986 987 #ifdef CONFIG_SMP 988 static void __init prefill_possible_map(void) 989 { 990 int i, possible = num_possible_cpus(); 991 992 if (possible > nr_cpu_ids) 993 possible = nr_cpu_ids; 994 995 for (i = 0; i < possible; i++) 996 set_cpu_possible(i, true); 997 for (; i < NR_CPUS; i++) 998 set_cpu_possible(i, false); 999 1000 nr_cpu_ids = possible; 1001 } 1002 #else 1003 static inline void prefill_possible_map(void) {} 1004 #endif 1005 1006 void __init setup_arch(char **cmdline_p) 1007 { 1008 cpu_probe(); 1009 mips_cm_probe(); 1010 prom_init(); 1011 1012 setup_early_fdc_console(); 1013 #ifdef CONFIG_EARLY_PRINTK 1014 setup_early_printk(); 1015 #endif 1016 cpu_report(); 1017 check_bugs_early(); 1018 1019 #if defined(CONFIG_VT) 1020 #if defined(CONFIG_VGA_CONSOLE) 1021 conswitchp = &vga_con; 1022 #elif defined(CONFIG_DUMMY_CONSOLE) 1023 conswitchp = &dummy_con; 1024 #endif 1025 #endif 1026 1027 arch_mem_init(cmdline_p); 1028 1029 resource_init(); 1030 plat_smp_setup(); 1031 prefill_possible_map(); 1032 1033 cpu_cache_init(); 1034 paging_init(); 1035 } 1036 1037 unsigned long kernelsp[NR_CPUS]; 1038 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 1039 1040 #ifdef CONFIG_USE_OF 1041 unsigned long fw_passed_dtb; 1042 #endif 1043 1044 #ifdef CONFIG_DEBUG_FS 1045 struct dentry *mips_debugfs_dir; 1046 static int __init debugfs_mips(void) 1047 { 1048 struct dentry *d; 1049 1050 d = debugfs_create_dir("mips", NULL); 1051 if (!d) 1052 return -ENOMEM; 1053 mips_debugfs_dir = d; 1054 return 0; 1055 } 1056 arch_initcall(debugfs_mips); 1057 #endif 1058