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_t)ULLONG_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 bool __init memory_region_available(phys_addr_t start, phys_addr_t size) 159 { 160 int i; 161 bool in_ram = false, free = true; 162 163 for (i = 0; i < boot_mem_map.nr_map; i++) { 164 phys_addr_t start_, end_; 165 166 start_ = boot_mem_map.map[i].addr; 167 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size; 168 169 switch (boot_mem_map.map[i].type) { 170 case BOOT_MEM_RAM: 171 if (start >= start_ && start + size <= end_) 172 in_ram = true; 173 break; 174 case BOOT_MEM_RESERVED: 175 if ((start >= start_ && start < end_) || 176 (start < start_ && start + size >= start_)) 177 free = false; 178 break; 179 default: 180 continue; 181 } 182 } 183 184 return in_ram && free; 185 } 186 187 static void __init print_memory_map(void) 188 { 189 int i; 190 const int field = 2 * sizeof(unsigned long); 191 192 for (i = 0; i < boot_mem_map.nr_map; i++) { 193 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ", 194 field, (unsigned long long) boot_mem_map.map[i].size, 195 field, (unsigned long long) boot_mem_map.map[i].addr); 196 197 switch (boot_mem_map.map[i].type) { 198 case BOOT_MEM_RAM: 199 printk(KERN_CONT "(usable)\n"); 200 break; 201 case BOOT_MEM_INIT_RAM: 202 printk(KERN_CONT "(usable after init)\n"); 203 break; 204 case BOOT_MEM_ROM_DATA: 205 printk(KERN_CONT "(ROM data)\n"); 206 break; 207 case BOOT_MEM_RESERVED: 208 printk(KERN_CONT "(reserved)\n"); 209 break; 210 default: 211 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type); 212 break; 213 } 214 } 215 } 216 217 /* 218 * Manage initrd 219 */ 220 #ifdef CONFIG_BLK_DEV_INITRD 221 222 static int __init rd_start_early(char *p) 223 { 224 unsigned long start = memparse(p, &p); 225 226 #ifdef CONFIG_64BIT 227 /* Guess if the sign extension was forgotten by bootloader */ 228 if (start < XKPHYS) 229 start = (int)start; 230 #endif 231 initrd_start = start; 232 initrd_end += start; 233 return 0; 234 } 235 early_param("rd_start", rd_start_early); 236 237 static int __init rd_size_early(char *p) 238 { 239 initrd_end += memparse(p, &p); 240 return 0; 241 } 242 early_param("rd_size", rd_size_early); 243 244 /* it returns the next free pfn after initrd */ 245 static unsigned long __init init_initrd(void) 246 { 247 unsigned long end; 248 249 /* 250 * Board specific code or command line parser should have 251 * already set up initrd_start and initrd_end. In these cases 252 * perfom sanity checks and use them if all looks good. 253 */ 254 if (!initrd_start || initrd_end <= initrd_start) 255 goto disable; 256 257 if (initrd_start & ~PAGE_MASK) { 258 pr_err("initrd start must be page aligned\n"); 259 goto disable; 260 } 261 if (initrd_start < PAGE_OFFSET) { 262 pr_err("initrd start < PAGE_OFFSET\n"); 263 goto disable; 264 } 265 266 /* 267 * Sanitize initrd addresses. For example firmware 268 * can't guess if they need to pass them through 269 * 64-bits values if the kernel has been built in pure 270 * 32-bit. We need also to switch from KSEG0 to XKPHYS 271 * addresses now, so the code can now safely use __pa(). 272 */ 273 end = __pa(initrd_end); 274 initrd_end = (unsigned long)__va(end); 275 initrd_start = (unsigned long)__va(__pa(initrd_start)); 276 277 ROOT_DEV = Root_RAM0; 278 return PFN_UP(end); 279 disable: 280 initrd_start = 0; 281 initrd_end = 0; 282 return 0; 283 } 284 285 /* In some conditions (e.g. big endian bootloader with a little endian 286 kernel), the initrd might appear byte swapped. Try to detect this and 287 byte swap it if needed. */ 288 static void __init maybe_bswap_initrd(void) 289 { 290 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 291 u64 buf; 292 293 /* Check for CPIO signature */ 294 if (!memcmp((void *)initrd_start, "070701", 6)) 295 return; 296 297 /* Check for compressed initrd */ 298 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 299 return; 300 301 /* Try again with a byte swapped header */ 302 buf = swab64p((u64 *)initrd_start); 303 if (!memcmp(&buf, "070701", 6) || 304 decompress_method((unsigned char *)(&buf), 8, NULL)) { 305 unsigned long i; 306 307 pr_info("Byteswapped initrd detected\n"); 308 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 309 swab64s((u64 *)i); 310 } 311 #endif 312 } 313 314 static void __init finalize_initrd(void) 315 { 316 unsigned long size = initrd_end - initrd_start; 317 318 if (size == 0) { 319 printk(KERN_INFO "Initrd not found or empty"); 320 goto disable; 321 } 322 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 323 printk(KERN_ERR "Initrd extends beyond end of memory"); 324 goto disable; 325 } 326 327 maybe_bswap_initrd(); 328 329 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT); 330 initrd_below_start_ok = 1; 331 332 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 333 initrd_start, size); 334 return; 335 disable: 336 printk(KERN_CONT " - disabling initrd\n"); 337 initrd_start = 0; 338 initrd_end = 0; 339 } 340 341 #else /* !CONFIG_BLK_DEV_INITRD */ 342 343 static unsigned long __init init_initrd(void) 344 { 345 return 0; 346 } 347 348 #define finalize_initrd() do {} while (0) 349 350 #endif 351 352 /* 353 * Initialize the bootmem allocator. It also setup initrd related data 354 * if needed. 355 */ 356 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA)) 357 358 static void __init bootmem_init(void) 359 { 360 init_initrd(); 361 finalize_initrd(); 362 } 363 364 #else /* !CONFIG_SGI_IP27 */ 365 366 static unsigned long __init bootmap_bytes(unsigned long pages) 367 { 368 unsigned long bytes = DIV_ROUND_UP(pages, 8); 369 370 return ALIGN(bytes, sizeof(long)); 371 } 372 373 static void __init bootmem_init(void) 374 { 375 unsigned long reserved_end; 376 unsigned long mapstart = ~0UL; 377 unsigned long bootmap_size; 378 bool bootmap_valid = false; 379 int i; 380 381 /* 382 * Sanity check any INITRD first. We don't take it into account 383 * for bootmem setup initially, rely on the end-of-kernel-code 384 * as our memory range starting point. Once bootmem is inited we 385 * will reserve the area used for the initrd. 386 */ 387 init_initrd(); 388 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end)); 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 */ 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 #ifndef CONFIG_HIGHMEM 411 /* 412 * Skip highmem here so we get an accurate max_low_pfn if low 413 * memory stops short of high memory. 414 * If the region overlaps HIGHMEM_START, end is clipped so 415 * max_pfn excludes the highmem portion. 416 */ 417 if (start >= PFN_DOWN(HIGHMEM_START)) 418 continue; 419 if (end > PFN_DOWN(HIGHMEM_START)) 420 end = PFN_DOWN(HIGHMEM_START); 421 #endif 422 423 if (end > max_low_pfn) 424 max_low_pfn = end; 425 if (start < min_low_pfn) 426 min_low_pfn = start; 427 if (end <= reserved_end) 428 continue; 429 #ifdef CONFIG_BLK_DEV_INITRD 430 /* Skip zones before initrd and initrd itself */ 431 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end))) 432 continue; 433 #endif 434 if (start >= mapstart) 435 continue; 436 mapstart = max(reserved_end, start); 437 } 438 439 if (min_low_pfn >= max_low_pfn) 440 panic("Incorrect memory mapping !!!"); 441 if (min_low_pfn > ARCH_PFN_OFFSET) { 442 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 443 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page), 444 min_low_pfn - ARCH_PFN_OFFSET); 445 } else if (min_low_pfn < ARCH_PFN_OFFSET) { 446 pr_info("%lu free pages won't be used\n", 447 ARCH_PFN_OFFSET - min_low_pfn); 448 } 449 min_low_pfn = ARCH_PFN_OFFSET; 450 451 /* 452 * Determine low and high memory ranges 453 */ 454 max_pfn = max_low_pfn; 455 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) { 456 #ifdef CONFIG_HIGHMEM 457 highstart_pfn = PFN_DOWN(HIGHMEM_START); 458 highend_pfn = max_low_pfn; 459 #endif 460 max_low_pfn = PFN_DOWN(HIGHMEM_START); 461 } 462 463 #ifdef CONFIG_BLK_DEV_INITRD 464 /* 465 * mapstart should be after initrd_end 466 */ 467 if (initrd_end) 468 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end))); 469 #endif 470 471 /* 472 * check that mapstart doesn't overlap with any of 473 * memory regions that have been reserved through eg. DTB 474 */ 475 bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn); 476 477 bootmap_valid = memory_region_available(PFN_PHYS(mapstart), 478 bootmap_size); 479 for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) { 480 unsigned long mapstart_addr; 481 482 switch (boot_mem_map.map[i].type) { 483 case BOOT_MEM_RESERVED: 484 mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr + 485 boot_mem_map.map[i].size); 486 if (PHYS_PFN(mapstart_addr) < mapstart) 487 break; 488 489 bootmap_valid = memory_region_available(mapstart_addr, 490 bootmap_size); 491 if (bootmap_valid) 492 mapstart = PHYS_PFN(mapstart_addr); 493 break; 494 default: 495 break; 496 } 497 } 498 499 if (!bootmap_valid) 500 panic("No memory area to place a bootmap bitmap"); 501 502 /* 503 * Initialize the boot-time allocator with low memory only. 504 */ 505 if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart, 506 min_low_pfn, max_low_pfn)) 507 panic("Unexpected memory size required for bootmap"); 508 509 for (i = 0; i < boot_mem_map.nr_map; i++) { 510 unsigned long start, end; 511 512 start = PFN_UP(boot_mem_map.map[i].addr); 513 end = PFN_DOWN(boot_mem_map.map[i].addr 514 + boot_mem_map.map[i].size); 515 516 if (start <= min_low_pfn) 517 start = min_low_pfn; 518 if (start >= end) 519 continue; 520 521 #ifndef CONFIG_HIGHMEM 522 if (end > max_low_pfn) 523 end = max_low_pfn; 524 525 /* 526 * ... finally, is the area going away? 527 */ 528 if (end <= start) 529 continue; 530 #endif 531 532 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0); 533 } 534 535 /* 536 * Register fully available low RAM pages with the bootmem allocator. 537 */ 538 for (i = 0; i < boot_mem_map.nr_map; i++) { 539 unsigned long start, end, size; 540 541 start = PFN_UP(boot_mem_map.map[i].addr); 542 end = PFN_DOWN(boot_mem_map.map[i].addr 543 + boot_mem_map.map[i].size); 544 545 /* 546 * Reserve usable memory. 547 */ 548 switch (boot_mem_map.map[i].type) { 549 case BOOT_MEM_RAM: 550 break; 551 case BOOT_MEM_INIT_RAM: 552 memory_present(0, start, end); 553 continue; 554 default: 555 /* Not usable memory */ 556 if (start > min_low_pfn && end < max_low_pfn) 557 reserve_bootmem(boot_mem_map.map[i].addr, 558 boot_mem_map.map[i].size, 559 BOOTMEM_DEFAULT); 560 continue; 561 } 562 563 /* 564 * We are rounding up the start address of usable memory 565 * and at the end of the usable range downwards. 566 */ 567 if (start >= max_low_pfn) 568 continue; 569 if (start < reserved_end) 570 start = reserved_end; 571 if (end > max_low_pfn) 572 end = max_low_pfn; 573 574 /* 575 * ... finally, is the area going away? 576 */ 577 if (end <= start) 578 continue; 579 size = end - start; 580 581 /* Register lowmem ranges */ 582 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT); 583 memory_present(0, start, end); 584 } 585 586 /* 587 * Reserve the bootmap memory. 588 */ 589 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT); 590 591 #ifdef CONFIG_RELOCATABLE 592 /* 593 * The kernel reserves all memory below its _end symbol as bootmem, 594 * but the kernel may now be at a much higher address. The memory 595 * between the original and new locations may be returned to the system. 596 */ 597 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) { 598 unsigned long offset; 599 extern void show_kernel_relocation(const char *level); 600 601 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS); 602 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset); 603 604 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO) 605 /* 606 * This information is necessary when debugging the kernel 607 * But is a security vulnerability otherwise! 608 */ 609 show_kernel_relocation(KERN_INFO); 610 #endif 611 } 612 #endif 613 614 /* 615 * Reserve initrd memory if needed. 616 */ 617 finalize_initrd(); 618 } 619 620 #endif /* CONFIG_SGI_IP27 */ 621 622 /* 623 * arch_mem_init - initialize memory management subsystem 624 * 625 * o plat_mem_setup() detects the memory configuration and will record detected 626 * memory areas using add_memory_region. 627 * 628 * At this stage the memory configuration of the system is known to the 629 * kernel but generic memory management system is still entirely uninitialized. 630 * 631 * o bootmem_init() 632 * o sparse_init() 633 * o paging_init() 634 * o dma_contiguous_reserve() 635 * 636 * At this stage the bootmem allocator is ready to use. 637 * 638 * NOTE: historically plat_mem_setup did the entire platform initialization. 639 * This was rather impractical because it meant plat_mem_setup had to 640 * get away without any kind of memory allocator. To keep old code from 641 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 642 * initialization hook for anything else was introduced. 643 */ 644 645 static int usermem __initdata; 646 647 static int __init early_parse_mem(char *p) 648 { 649 phys_addr_t start, size; 650 651 /* 652 * If a user specifies memory size, we 653 * blow away any automatically generated 654 * size. 655 */ 656 if (usermem == 0) { 657 boot_mem_map.nr_map = 0; 658 usermem = 1; 659 } 660 start = 0; 661 size = memparse(p, &p); 662 if (*p == '@') 663 start = memparse(p + 1, &p); 664 665 add_memory_region(start, size, BOOT_MEM_RAM); 666 667 if (start && start > PHYS_OFFSET) 668 add_memory_region(PHYS_OFFSET, start - PHYS_OFFSET, 669 BOOT_MEM_RESERVED); 670 return 0; 671 } 672 early_param("mem", early_parse_mem); 673 674 static int __init early_parse_memmap(char *p) 675 { 676 char *oldp; 677 u64 start_at, mem_size; 678 679 if (!p) 680 return -EINVAL; 681 682 if (!strncmp(p, "exactmap", 8)) { 683 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 684 return 0; 685 } 686 687 oldp = p; 688 mem_size = memparse(p, &p); 689 if (p == oldp) 690 return -EINVAL; 691 692 if (*p == '@') { 693 start_at = memparse(p+1, &p); 694 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 695 } else if (*p == '#') { 696 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 697 return -EINVAL; 698 } else if (*p == '$') { 699 start_at = memparse(p+1, &p); 700 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED); 701 } else { 702 pr_err("\"memmap\" invalid format!\n"); 703 return -EINVAL; 704 } 705 706 if (*p == '\0') { 707 usermem = 1; 708 return 0; 709 } else 710 return -EINVAL; 711 } 712 early_param("memmap", early_parse_memmap); 713 714 #ifdef CONFIG_PROC_VMCORE 715 unsigned long setup_elfcorehdr, setup_elfcorehdr_size; 716 static int __init early_parse_elfcorehdr(char *p) 717 { 718 int i; 719 720 setup_elfcorehdr = memparse(p, &p); 721 722 for (i = 0; i < boot_mem_map.nr_map; i++) { 723 unsigned long start = boot_mem_map.map[i].addr; 724 unsigned long end = (boot_mem_map.map[i].addr + 725 boot_mem_map.map[i].size); 726 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) { 727 /* 728 * Reserve from the elf core header to the end of 729 * the memory segment, that should all be kdump 730 * reserved memory. 731 */ 732 setup_elfcorehdr_size = end - setup_elfcorehdr; 733 break; 734 } 735 } 736 /* 737 * If we don't find it in the memory map, then we shouldn't 738 * have to worry about it, as the new kernel won't use it. 739 */ 740 return 0; 741 } 742 early_param("elfcorehdr", early_parse_elfcorehdr); 743 #endif 744 745 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type) 746 { 747 phys_addr_t size; 748 int i; 749 750 size = end - mem; 751 if (!size) 752 return; 753 754 /* Make sure it is in the boot_mem_map */ 755 for (i = 0; i < boot_mem_map.nr_map; i++) { 756 if (mem >= boot_mem_map.map[i].addr && 757 mem < (boot_mem_map.map[i].addr + 758 boot_mem_map.map[i].size)) 759 return; 760 } 761 add_memory_region(mem, size, type); 762 } 763 764 #ifdef CONFIG_KEXEC 765 static inline unsigned long long get_total_mem(void) 766 { 767 unsigned long long total; 768 769 total = max_pfn - min_low_pfn; 770 return total << PAGE_SHIFT; 771 } 772 773 static void __init mips_parse_crashkernel(void) 774 { 775 unsigned long long total_mem; 776 unsigned long long crash_size, crash_base; 777 int ret; 778 779 total_mem = get_total_mem(); 780 ret = parse_crashkernel(boot_command_line, total_mem, 781 &crash_size, &crash_base); 782 if (ret != 0 || crash_size <= 0) 783 return; 784 785 if (!memory_region_available(crash_base, crash_size)) { 786 pr_warn("Invalid memory region reserved for crash kernel\n"); 787 return; 788 } 789 790 crashk_res.start = crash_base; 791 crashk_res.end = crash_base + crash_size - 1; 792 } 793 794 static void __init request_crashkernel(struct resource *res) 795 { 796 int ret; 797 798 if (crashk_res.start == crashk_res.end) 799 return; 800 801 ret = request_resource(res, &crashk_res); 802 if (!ret) 803 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 804 (unsigned long)((crashk_res.end - 805 crashk_res.start + 1) >> 20), 806 (unsigned long)(crashk_res.start >> 20)); 807 } 808 #else /* !defined(CONFIG_KEXEC) */ 809 static void __init mips_parse_crashkernel(void) 810 { 811 } 812 813 static void __init request_crashkernel(struct resource *res) 814 { 815 } 816 #endif /* !defined(CONFIG_KEXEC) */ 817 818 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER) 819 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) 820 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) 821 #define BUILTIN_EXTEND_WITH_PROM \ 822 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND) 823 824 static void __init arch_mem_init(char **cmdline_p) 825 { 826 struct memblock_region *reg; 827 extern void plat_mem_setup(void); 828 829 /* call board setup routine */ 830 plat_mem_setup(); 831 832 /* 833 * Make sure all kernel memory is in the maps. The "UP" and 834 * "DOWN" are opposite for initdata since if it crosses over 835 * into another memory section you don't want that to be 836 * freed when the initdata is freed. 837 */ 838 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT, 839 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT, 840 BOOT_MEM_RAM); 841 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT, 842 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT, 843 BOOT_MEM_INIT_RAM); 844 845 pr_info("Determined physical RAM map:\n"); 846 print_memory_map(); 847 848 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE) 849 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 850 #else 851 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) || 852 (USE_DTB_CMDLINE && !boot_command_line[0])) 853 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 854 855 if (EXTEND_WITH_PROM && arcs_cmdline[0]) { 856 if (boot_command_line[0]) 857 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 858 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 859 } 860 861 #if defined(CONFIG_CMDLINE_BOOL) 862 if (builtin_cmdline[0]) { 863 if (boot_command_line[0]) 864 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 865 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 866 } 867 868 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) { 869 if (boot_command_line[0]) 870 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 871 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 872 } 873 #endif 874 #endif 875 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 876 877 *cmdline_p = command_line; 878 879 parse_early_param(); 880 881 if (usermem) { 882 pr_info("User-defined physical RAM map:\n"); 883 print_memory_map(); 884 } 885 886 early_init_fdt_reserve_self(); 887 early_init_fdt_scan_reserved_mem(); 888 889 bootmem_init(); 890 #ifdef CONFIG_PROC_VMCORE 891 if (setup_elfcorehdr && setup_elfcorehdr_size) { 892 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", 893 setup_elfcorehdr, setup_elfcorehdr_size); 894 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size, 895 BOOTMEM_DEFAULT); 896 } 897 #endif 898 899 mips_parse_crashkernel(); 900 #ifdef CONFIG_KEXEC 901 if (crashk_res.start != crashk_res.end) 902 reserve_bootmem(crashk_res.start, 903 crashk_res.end - crashk_res.start + 1, 904 BOOTMEM_DEFAULT); 905 #endif 906 device_tree_init(); 907 sparse_init(); 908 plat_swiotlb_setup(); 909 910 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 911 /* Tell bootmem about cma reserved memblock section */ 912 for_each_memblock(reserved, reg) 913 if (reg->size != 0) 914 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT); 915 916 reserve_bootmem_region(__pa_symbol(&__nosave_begin), 917 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */ 918 } 919 920 static void __init resource_init(void) 921 { 922 int i; 923 924 if (UNCAC_BASE != IO_BASE) 925 return; 926 927 code_resource.start = __pa_symbol(&_text); 928 code_resource.end = __pa_symbol(&_etext) - 1; 929 data_resource.start = __pa_symbol(&_etext); 930 data_resource.end = __pa_symbol(&_edata) - 1; 931 bss_resource.start = __pa_symbol(&__bss_start); 932 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 933 934 for (i = 0; i < boot_mem_map.nr_map; i++) { 935 struct resource *res; 936 unsigned long start, end; 937 938 start = boot_mem_map.map[i].addr; 939 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1; 940 if (start >= HIGHMEM_START) 941 continue; 942 if (end >= HIGHMEM_START) 943 end = HIGHMEM_START - 1; 944 945 res = alloc_bootmem(sizeof(struct resource)); 946 947 res->start = start; 948 res->end = end; 949 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 950 951 switch (boot_mem_map.map[i].type) { 952 case BOOT_MEM_RAM: 953 case BOOT_MEM_INIT_RAM: 954 case BOOT_MEM_ROM_DATA: 955 res->name = "System RAM"; 956 res->flags |= IORESOURCE_SYSRAM; 957 break; 958 case BOOT_MEM_RESERVED: 959 default: 960 res->name = "reserved"; 961 } 962 963 request_resource(&iomem_resource, res); 964 965 /* 966 * We don't know which RAM region contains kernel data, 967 * so we try it repeatedly and let the resource manager 968 * test it. 969 */ 970 request_resource(res, &code_resource); 971 request_resource(res, &data_resource); 972 request_resource(res, &bss_resource); 973 request_crashkernel(res); 974 } 975 } 976 977 #ifdef CONFIG_SMP 978 static void __init prefill_possible_map(void) 979 { 980 int i, possible = num_possible_cpus(); 981 982 if (possible > nr_cpu_ids) 983 possible = nr_cpu_ids; 984 985 for (i = 0; i < possible; i++) 986 set_cpu_possible(i, true); 987 for (; i < NR_CPUS; i++) 988 set_cpu_possible(i, false); 989 990 nr_cpu_ids = possible; 991 } 992 #else 993 static inline void prefill_possible_map(void) {} 994 #endif 995 996 void __init setup_arch(char **cmdline_p) 997 { 998 cpu_probe(); 999 mips_cm_probe(); 1000 prom_init(); 1001 1002 setup_early_fdc_console(); 1003 #ifdef CONFIG_EARLY_PRINTK 1004 setup_early_printk(); 1005 #endif 1006 cpu_report(); 1007 check_bugs_early(); 1008 1009 #if defined(CONFIG_VT) 1010 #if defined(CONFIG_VGA_CONSOLE) 1011 conswitchp = &vga_con; 1012 #elif defined(CONFIG_DUMMY_CONSOLE) 1013 conswitchp = &dummy_con; 1014 #endif 1015 #endif 1016 1017 arch_mem_init(cmdline_p); 1018 1019 resource_init(); 1020 plat_smp_setup(); 1021 prefill_possible_map(); 1022 1023 cpu_cache_init(); 1024 paging_init(); 1025 } 1026 1027 unsigned long kernelsp[NR_CPUS]; 1028 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 1029 1030 #ifdef CONFIG_USE_OF 1031 unsigned long fw_passed_dtb; 1032 #endif 1033 1034 #ifdef CONFIG_DEBUG_FS 1035 struct dentry *mips_debugfs_dir; 1036 static int __init debugfs_mips(void) 1037 { 1038 struct dentry *d; 1039 1040 d = debugfs_create_dir("mips", NULL); 1041 if (!d) 1042 return -ENOMEM; 1043 mips_debugfs_dir = d; 1044 return 0; 1045 } 1046 arch_initcall(debugfs_mips); 1047 #endif 1048