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 #include <linux/of_reserved_mem.h> 31 32 #include <asm/addrspace.h> 33 #include <asm/bootinfo.h> 34 #include <asm/bugs.h> 35 #include <asm/cache.h> 36 #include <asm/cdmm.h> 37 #include <asm/cpu.h> 38 #include <asm/debug.h> 39 #include <asm/dma-coherence.h> 40 #include <asm/sections.h> 41 #include <asm/setup.h> 42 #include <asm/smp-ops.h> 43 #include <asm/prom.h> 44 45 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB 46 const char __section(.appended_dtb) __appended_dtb[0x100000]; 47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ 48 49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 50 51 EXPORT_SYMBOL(cpu_data); 52 53 #ifdef CONFIG_VT 54 struct screen_info screen_info; 55 #endif 56 57 /* 58 * Setup information 59 * 60 * These are initialized so they are in the .data section 61 */ 62 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; 63 64 EXPORT_SYMBOL(mips_machtype); 65 66 static char __initdata command_line[COMMAND_LINE_SIZE]; 67 char __initdata arcs_cmdline[COMMAND_LINE_SIZE]; 68 69 #ifdef CONFIG_CMDLINE_BOOL 70 static char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE; 71 #endif 72 73 /* 74 * mips_io_port_base is the begin of the address space to which x86 style 75 * I/O ports are mapped. 76 */ 77 unsigned long mips_io_port_base = -1; 78 EXPORT_SYMBOL(mips_io_port_base); 79 80 static struct resource code_resource = { .name = "Kernel code", }; 81 static struct resource data_resource = { .name = "Kernel data", }; 82 static struct resource bss_resource = { .name = "Kernel bss", }; 83 84 static void *detect_magic __initdata = detect_memory_region; 85 86 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 87 unsigned long ARCH_PFN_OFFSET; 88 EXPORT_SYMBOL(ARCH_PFN_OFFSET); 89 #endif 90 91 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type) 92 { 93 /* 94 * Note: This function only exists for historical reason, 95 * new code should use memblock_add or memblock_add_node instead. 96 */ 97 98 /* 99 * If the region reaches the top of the physical address space, adjust 100 * the size slightly so that (start + size) doesn't overflow 101 */ 102 if (start + size - 1 == PHYS_ADDR_MAX) 103 --size; 104 105 /* Sanity check */ 106 if (start + size < start) { 107 pr_warn("Trying to add an invalid memory region, skipped\n"); 108 return; 109 } 110 111 memblock_add(start, size); 112 /* Reserve any memory except the ordinary RAM ranges. */ 113 switch (type) { 114 case BOOT_MEM_RAM: 115 break; 116 117 case BOOT_MEM_NOMAP: /* Discard the range from the system. */ 118 memblock_remove(start, size); 119 break; 120 121 default: /* Reserve the rest of the memory types at boot time */ 122 memblock_reserve(start, size); 123 break; 124 } 125 } 126 127 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 128 { 129 void *dm = &detect_magic; 130 phys_addr_t size; 131 132 for (size = sz_min; size < sz_max; size <<= 1) { 133 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 134 break; 135 } 136 137 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 138 ((unsigned long long) size) / SZ_1M, 139 (unsigned long long) start, 140 ((unsigned long long) sz_min) / SZ_1M, 141 ((unsigned long long) sz_max) / SZ_1M); 142 143 add_memory_region(start, size, BOOT_MEM_RAM); 144 } 145 146 /* 147 * Manage initrd 148 */ 149 #ifdef CONFIG_BLK_DEV_INITRD 150 151 static int __init rd_start_early(char *p) 152 { 153 unsigned long start = memparse(p, &p); 154 155 #ifdef CONFIG_64BIT 156 /* Guess if the sign extension was forgotten by bootloader */ 157 if (start < XKPHYS) 158 start = (int)start; 159 #endif 160 initrd_start = start; 161 initrd_end += start; 162 return 0; 163 } 164 early_param("rd_start", rd_start_early); 165 166 static int __init rd_size_early(char *p) 167 { 168 initrd_end += memparse(p, &p); 169 return 0; 170 } 171 early_param("rd_size", rd_size_early); 172 173 /* it returns the next free pfn after initrd */ 174 static unsigned long __init init_initrd(void) 175 { 176 unsigned long end; 177 178 /* 179 * Board specific code or command line parser should have 180 * already set up initrd_start and initrd_end. In these cases 181 * perfom sanity checks and use them if all looks good. 182 */ 183 if (!initrd_start || initrd_end <= initrd_start) 184 goto disable; 185 186 if (initrd_start & ~PAGE_MASK) { 187 pr_err("initrd start must be page aligned\n"); 188 goto disable; 189 } 190 if (initrd_start < PAGE_OFFSET) { 191 pr_err("initrd start < PAGE_OFFSET\n"); 192 goto disable; 193 } 194 195 /* 196 * Sanitize initrd addresses. For example firmware 197 * can't guess if they need to pass them through 198 * 64-bits values if the kernel has been built in pure 199 * 32-bit. We need also to switch from KSEG0 to XKPHYS 200 * addresses now, so the code can now safely use __pa(). 201 */ 202 end = __pa(initrd_end); 203 initrd_end = (unsigned long)__va(end); 204 initrd_start = (unsigned long)__va(__pa(initrd_start)); 205 206 ROOT_DEV = Root_RAM0; 207 return PFN_UP(end); 208 disable: 209 initrd_start = 0; 210 initrd_end = 0; 211 return 0; 212 } 213 214 /* In some conditions (e.g. big endian bootloader with a little endian 215 kernel), the initrd might appear byte swapped. Try to detect this and 216 byte swap it if needed. */ 217 static void __init maybe_bswap_initrd(void) 218 { 219 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 220 u64 buf; 221 222 /* Check for CPIO signature */ 223 if (!memcmp((void *)initrd_start, "070701", 6)) 224 return; 225 226 /* Check for compressed initrd */ 227 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 228 return; 229 230 /* Try again with a byte swapped header */ 231 buf = swab64p((u64 *)initrd_start); 232 if (!memcmp(&buf, "070701", 6) || 233 decompress_method((unsigned char *)(&buf), 8, NULL)) { 234 unsigned long i; 235 236 pr_info("Byteswapped initrd detected\n"); 237 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 238 swab64s((u64 *)i); 239 } 240 #endif 241 } 242 243 static void __init finalize_initrd(void) 244 { 245 unsigned long size = initrd_end - initrd_start; 246 247 if (size == 0) { 248 printk(KERN_INFO "Initrd not found or empty"); 249 goto disable; 250 } 251 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 252 printk(KERN_ERR "Initrd extends beyond end of memory"); 253 goto disable; 254 } 255 256 maybe_bswap_initrd(); 257 258 memblock_reserve(__pa(initrd_start), size); 259 initrd_below_start_ok = 1; 260 261 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 262 initrd_start, size); 263 return; 264 disable: 265 printk(KERN_CONT " - disabling initrd\n"); 266 initrd_start = 0; 267 initrd_end = 0; 268 } 269 270 #else /* !CONFIG_BLK_DEV_INITRD */ 271 272 static unsigned long __init init_initrd(void) 273 { 274 return 0; 275 } 276 277 #define finalize_initrd() do {} while (0) 278 279 #endif 280 281 /* 282 * Initialize the bootmem allocator. It also setup initrd related data 283 * if needed. 284 */ 285 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA)) 286 287 static void __init bootmem_init(void) 288 { 289 init_initrd(); 290 finalize_initrd(); 291 } 292 293 #else /* !CONFIG_SGI_IP27 */ 294 295 static void __init bootmem_init(void) 296 { 297 struct memblock_region *mem; 298 phys_addr_t ramstart, ramend; 299 300 ramstart = memblock_start_of_DRAM(); 301 ramend = memblock_end_of_DRAM(); 302 303 /* 304 * Sanity check any INITRD first. We don't take it into account 305 * for bootmem setup initially, rely on the end-of-kernel-code 306 * as our memory range starting point. Once bootmem is inited we 307 * will reserve the area used for the initrd. 308 */ 309 init_initrd(); 310 311 /* Reserve memory occupied by kernel. */ 312 memblock_reserve(__pa_symbol(&_text), 313 __pa_symbol(&_end) - __pa_symbol(&_text)); 314 315 /* max_low_pfn is not a number of pages but the end pfn of low mem */ 316 317 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 318 ARCH_PFN_OFFSET = PFN_UP(ramstart); 319 #else 320 /* 321 * Reserve any memory between the start of RAM and PHYS_OFFSET 322 */ 323 if (ramstart > PHYS_OFFSET) 324 memblock_reserve(PHYS_OFFSET, PFN_UP(ramstart) - PHYS_OFFSET); 325 326 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) { 327 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 328 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)), 329 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET)); 330 } 331 #endif 332 333 min_low_pfn = ARCH_PFN_OFFSET; 334 max_pfn = PFN_DOWN(ramend); 335 for_each_memblock(memory, mem) { 336 unsigned long start = memblock_region_memory_base_pfn(mem); 337 unsigned long end = memblock_region_memory_end_pfn(mem); 338 339 /* 340 * Skip highmem here so we get an accurate max_low_pfn if low 341 * memory stops short of high memory. 342 * If the region overlaps HIGHMEM_START, end is clipped so 343 * max_pfn excludes the highmem portion. 344 */ 345 if (memblock_is_nomap(mem)) 346 continue; 347 if (start >= PFN_DOWN(HIGHMEM_START)) 348 continue; 349 if (end > PFN_DOWN(HIGHMEM_START)) 350 end = PFN_DOWN(HIGHMEM_START); 351 if (end > max_low_pfn) 352 max_low_pfn = end; 353 } 354 355 if (min_low_pfn >= max_low_pfn) 356 panic("Incorrect memory mapping !!!"); 357 358 if (max_pfn > PFN_DOWN(HIGHMEM_START)) { 359 #ifdef CONFIG_HIGHMEM 360 highstart_pfn = PFN_DOWN(HIGHMEM_START); 361 highend_pfn = max_pfn; 362 #else 363 max_low_pfn = PFN_DOWN(HIGHMEM_START); 364 max_pfn = max_low_pfn; 365 #endif 366 } 367 368 369 /* 370 * In any case the added to the memblock memory regions 371 * (highmem/lowmem, available/reserved, etc) are considered 372 * as present, so inform sparsemem about them. 373 */ 374 memblocks_present(); 375 376 /* 377 * Reserve initrd memory if needed. 378 */ 379 finalize_initrd(); 380 } 381 382 #endif /* CONFIG_SGI_IP27 */ 383 384 static int usermem __initdata; 385 386 static int __init early_parse_mem(char *p) 387 { 388 phys_addr_t start, size; 389 390 /* 391 * If a user specifies memory size, we 392 * blow away any automatically generated 393 * size. 394 */ 395 if (usermem == 0) { 396 usermem = 1; 397 memblock_remove(memblock_start_of_DRAM(), 398 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 399 } 400 start = 0; 401 size = memparse(p, &p); 402 if (*p == '@') 403 start = memparse(p + 1, &p); 404 405 add_memory_region(start, size, BOOT_MEM_RAM); 406 407 return 0; 408 } 409 early_param("mem", early_parse_mem); 410 411 static int __init early_parse_memmap(char *p) 412 { 413 char *oldp; 414 u64 start_at, mem_size; 415 416 if (!p) 417 return -EINVAL; 418 419 if (!strncmp(p, "exactmap", 8)) { 420 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 421 return 0; 422 } 423 424 oldp = p; 425 mem_size = memparse(p, &p); 426 if (p == oldp) 427 return -EINVAL; 428 429 if (*p == '@') { 430 start_at = memparse(p+1, &p); 431 add_memory_region(start_at, mem_size, BOOT_MEM_RAM); 432 } else if (*p == '#') { 433 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 434 return -EINVAL; 435 } else if (*p == '$') { 436 start_at = memparse(p+1, &p); 437 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED); 438 } else { 439 pr_err("\"memmap\" invalid format!\n"); 440 return -EINVAL; 441 } 442 443 if (*p == '\0') { 444 usermem = 1; 445 return 0; 446 } else 447 return -EINVAL; 448 } 449 early_param("memmap", early_parse_memmap); 450 451 #ifdef CONFIG_PROC_VMCORE 452 unsigned long setup_elfcorehdr, setup_elfcorehdr_size; 453 static int __init early_parse_elfcorehdr(char *p) 454 { 455 struct memblock_region *mem; 456 457 setup_elfcorehdr = memparse(p, &p); 458 459 for_each_memblock(memory, mem) { 460 unsigned long start = mem->base; 461 unsigned long end = start + mem->size; 462 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) { 463 /* 464 * Reserve from the elf core header to the end of 465 * the memory segment, that should all be kdump 466 * reserved memory. 467 */ 468 setup_elfcorehdr_size = end - setup_elfcorehdr; 469 break; 470 } 471 } 472 /* 473 * If we don't find it in the memory map, then we shouldn't 474 * have to worry about it, as the new kernel won't use it. 475 */ 476 return 0; 477 } 478 early_param("elfcorehdr", early_parse_elfcorehdr); 479 #endif 480 481 #ifdef CONFIG_KEXEC 482 static void __init mips_parse_crashkernel(void) 483 { 484 unsigned long long total_mem; 485 unsigned long long crash_size, crash_base; 486 int ret; 487 488 total_mem = memblock_phys_mem_size(); 489 ret = parse_crashkernel(boot_command_line, total_mem, 490 &crash_size, &crash_base); 491 if (ret != 0 || crash_size <= 0) 492 return; 493 494 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) { 495 pr_warn("Invalid memory region reserved for crash kernel\n"); 496 return; 497 } 498 499 crashk_res.start = crash_base; 500 crashk_res.end = crash_base + crash_size - 1; 501 } 502 503 static void __init request_crashkernel(struct resource *res) 504 { 505 int ret; 506 507 if (crashk_res.start == crashk_res.end) 508 return; 509 510 ret = request_resource(res, &crashk_res); 511 if (!ret) 512 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 513 (unsigned long)((crashk_res.end - 514 crashk_res.start + 1) >> 20), 515 (unsigned long)(crashk_res.start >> 20)); 516 } 517 #else /* !defined(CONFIG_KEXEC) */ 518 static void __init mips_parse_crashkernel(void) 519 { 520 } 521 522 static void __init request_crashkernel(struct resource *res) 523 { 524 } 525 #endif /* !defined(CONFIG_KEXEC) */ 526 527 static void __init check_kernel_sections_mem(void) 528 { 529 phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text))); 530 phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start; 531 532 if (!memblock_is_region_memory(start, size)) { 533 pr_info("Kernel sections are not in the memory maps\n"); 534 memblock_add(start, size); 535 } 536 } 537 538 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER) 539 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) 540 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) 541 #define BUILTIN_EXTEND_WITH_PROM \ 542 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND) 543 544 /* 545 * arch_mem_init - initialize memory management subsystem 546 * 547 * o plat_mem_setup() detects the memory configuration and will record detected 548 * memory areas using add_memory_region. 549 * 550 * At this stage the memory configuration of the system is known to the 551 * kernel but generic memory management system is still entirely uninitialized. 552 * 553 * o bootmem_init() 554 * o sparse_init() 555 * o paging_init() 556 * o dma_contiguous_reserve() 557 * 558 * At this stage the bootmem allocator is ready to use. 559 * 560 * NOTE: historically plat_mem_setup did the entire platform initialization. 561 * This was rather impractical because it meant plat_mem_setup had to 562 * get away without any kind of memory allocator. To keep old code from 563 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 564 * initialization hook for anything else was introduced. 565 */ 566 static void __init arch_mem_init(char **cmdline_p) 567 { 568 extern void plat_mem_setup(void); 569 570 /* 571 * Initialize boot_command_line to an innocuous but non-empty string in 572 * order to prevent early_init_dt_scan_chosen() from copying 573 * CONFIG_CMDLINE into it without our knowledge. We handle 574 * CONFIG_CMDLINE ourselves below & don't want to duplicate its 575 * content because repeating arguments can be problematic. 576 */ 577 strlcpy(boot_command_line, " ", COMMAND_LINE_SIZE); 578 579 /* call board setup routine */ 580 plat_mem_setup(); 581 memblock_set_bottom_up(true); 582 583 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE) 584 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 585 #else 586 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) || 587 (USE_DTB_CMDLINE && !boot_command_line[0])) 588 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 589 590 if (EXTEND_WITH_PROM && arcs_cmdline[0]) { 591 if (boot_command_line[0]) 592 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 593 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 594 } 595 596 #if defined(CONFIG_CMDLINE_BOOL) 597 if (builtin_cmdline[0]) { 598 if (boot_command_line[0]) 599 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 600 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 601 } 602 603 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) { 604 if (boot_command_line[0]) 605 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 606 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE); 607 } 608 #endif 609 #endif 610 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 611 612 *cmdline_p = command_line; 613 614 parse_early_param(); 615 616 if (usermem) 617 pr_info("User-defined physical RAM map overwrite\n"); 618 619 check_kernel_sections_mem(); 620 621 early_init_fdt_reserve_self(); 622 early_init_fdt_scan_reserved_mem(); 623 624 #ifndef CONFIG_NUMA 625 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); 626 #endif 627 bootmem_init(); 628 629 /* 630 * Prevent memblock from allocating high memory. 631 * This cannot be done before max_low_pfn is detected, so up 632 * to this point is possible to only reserve physical memory 633 * with memblock_reserve; memblock_alloc* can be used 634 * only after this point 635 */ 636 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 637 638 #ifdef CONFIG_PROC_VMCORE 639 if (setup_elfcorehdr && setup_elfcorehdr_size) { 640 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", 641 setup_elfcorehdr, setup_elfcorehdr_size); 642 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size); 643 } 644 #endif 645 646 mips_parse_crashkernel(); 647 #ifdef CONFIG_KEXEC 648 if (crashk_res.start != crashk_res.end) 649 memblock_reserve(crashk_res.start, 650 crashk_res.end - crashk_res.start + 1); 651 #endif 652 device_tree_init(); 653 sparse_init(); 654 plat_swiotlb_setup(); 655 656 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 657 658 /* Reserve for hibernation. */ 659 memblock_reserve(__pa_symbol(&__nosave_begin), 660 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); 661 662 fdt_init_reserved_mem(); 663 664 memblock_dump_all(); 665 666 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 667 } 668 669 static void __init resource_init(void) 670 { 671 struct memblock_region *region; 672 673 if (UNCAC_BASE != IO_BASE) 674 return; 675 676 code_resource.start = __pa_symbol(&_text); 677 code_resource.end = __pa_symbol(&_etext) - 1; 678 data_resource.start = __pa_symbol(&_etext); 679 data_resource.end = __pa_symbol(&_edata) - 1; 680 bss_resource.start = __pa_symbol(&__bss_start); 681 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 682 683 for_each_memblock(memory, region) { 684 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region)); 685 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1; 686 struct resource *res; 687 688 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 689 if (!res) 690 panic("%s: Failed to allocate %zu bytes\n", __func__, 691 sizeof(struct resource)); 692 693 res->start = start; 694 res->end = end; 695 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 696 res->name = "System RAM"; 697 698 request_resource(&iomem_resource, res); 699 700 /* 701 * We don't know which RAM region contains kernel data, 702 * so we try it repeatedly and let the resource manager 703 * test it. 704 */ 705 request_resource(res, &code_resource); 706 request_resource(res, &data_resource); 707 request_resource(res, &bss_resource); 708 request_crashkernel(res); 709 } 710 } 711 712 #ifdef CONFIG_SMP 713 static void __init prefill_possible_map(void) 714 { 715 int i, possible = num_possible_cpus(); 716 717 if (possible > nr_cpu_ids) 718 possible = nr_cpu_ids; 719 720 for (i = 0; i < possible; i++) 721 set_cpu_possible(i, true); 722 for (; i < NR_CPUS; i++) 723 set_cpu_possible(i, false); 724 725 nr_cpu_ids = possible; 726 } 727 #else 728 static inline void prefill_possible_map(void) {} 729 #endif 730 731 void __init setup_arch(char **cmdline_p) 732 { 733 cpu_probe(); 734 mips_cm_probe(); 735 prom_init(); 736 737 setup_early_fdc_console(); 738 #ifdef CONFIG_EARLY_PRINTK 739 setup_early_printk(); 740 #endif 741 cpu_report(); 742 check_bugs_early(); 743 744 #if defined(CONFIG_VT) 745 #if defined(CONFIG_VGA_CONSOLE) 746 conswitchp = &vga_con; 747 #elif defined(CONFIG_DUMMY_CONSOLE) 748 conswitchp = &dummy_con; 749 #endif 750 #endif 751 752 arch_mem_init(cmdline_p); 753 754 resource_init(); 755 plat_smp_setup(); 756 prefill_possible_map(); 757 758 cpu_cache_init(); 759 paging_init(); 760 } 761 762 unsigned long kernelsp[NR_CPUS]; 763 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 764 765 #ifdef CONFIG_USE_OF 766 unsigned long fw_passed_dtb; 767 #endif 768 769 #ifdef CONFIG_DEBUG_FS 770 struct dentry *mips_debugfs_dir; 771 static int __init debugfs_mips(void) 772 { 773 mips_debugfs_dir = debugfs_create_dir("mips", NULL); 774 return 0; 775 } 776 arch_initcall(debugfs_mips); 777 #endif 778 779 #ifdef CONFIG_DMA_MAYBE_COHERENT 780 /* User defined DMA coherency from command line. */ 781 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT; 782 EXPORT_SYMBOL_GPL(coherentio); 783 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */ 784 785 static int __init setcoherentio(char *str) 786 { 787 coherentio = IO_COHERENCE_ENABLED; 788 pr_info("Hardware DMA cache coherency (command line)\n"); 789 return 0; 790 } 791 early_param("coherentio", setcoherentio); 792 793 static int __init setnocoherentio(char *str) 794 { 795 coherentio = IO_COHERENCE_DISABLED; 796 pr_info("Software DMA cache coherency (command line)\n"); 797 return 0; 798 } 799 early_param("nocoherentio", setnocoherentio); 800 #endif 801