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-map-ops.h> 28 #include <linux/decompress/generic.h> 29 #include <linux/of_fdt.h> 30 #include <linux/dmi.h> 31 #include <linux/crash_dump.h> 32 33 #include <asm/addrspace.h> 34 #include <asm/bootinfo.h> 35 #include <asm/bugs.h> 36 #include <asm/cache.h> 37 #include <asm/cdmm.h> 38 #include <asm/cpu.h> 39 #include <asm/debug.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 const char builtin_cmdline[] __initconst = CONFIG_CMDLINE; 71 #else 72 static const char builtin_cmdline[] __initconst = ""; 73 #endif 74 75 /* 76 * mips_io_port_base is the begin of the address space to which x86 style 77 * I/O ports are mapped. 78 */ 79 unsigned long mips_io_port_base = -1; 80 EXPORT_SYMBOL(mips_io_port_base); 81 82 static struct resource code_resource = { .name = "Kernel code", }; 83 static struct resource data_resource = { .name = "Kernel data", }; 84 static struct resource bss_resource = { .name = "Kernel bss", }; 85 86 unsigned long __kaslr_offset __ro_after_init; 87 EXPORT_SYMBOL(__kaslr_offset); 88 89 static void *detect_magic __initdata = detect_memory_region; 90 91 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 92 unsigned long ARCH_PFN_OFFSET; 93 EXPORT_SYMBOL(ARCH_PFN_OFFSET); 94 #endif 95 96 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 97 { 98 void *dm = &detect_magic; 99 phys_addr_t size; 100 101 for (size = sz_min; size < sz_max; size <<= 1) { 102 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 103 break; 104 } 105 106 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 107 ((unsigned long long) size) / SZ_1M, 108 (unsigned long long) start, 109 ((unsigned long long) sz_min) / SZ_1M, 110 ((unsigned long long) sz_max) / SZ_1M); 111 112 memblock_add(start, size); 113 } 114 115 /* 116 * Manage initrd 117 */ 118 #ifdef CONFIG_BLK_DEV_INITRD 119 120 static int __init rd_start_early(char *p) 121 { 122 unsigned long start = memparse(p, &p); 123 124 #ifdef CONFIG_64BIT 125 /* Guess if the sign extension was forgotten by bootloader */ 126 if (start < XKPHYS) 127 start = (int)start; 128 #endif 129 initrd_start = start; 130 initrd_end += start; 131 return 0; 132 } 133 early_param("rd_start", rd_start_early); 134 135 static int __init rd_size_early(char *p) 136 { 137 initrd_end += memparse(p, &p); 138 return 0; 139 } 140 early_param("rd_size", rd_size_early); 141 142 /* it returns the next free pfn after initrd */ 143 static unsigned long __init init_initrd(void) 144 { 145 unsigned long end; 146 147 /* 148 * Board specific code or command line parser should have 149 * already set up initrd_start and initrd_end. In these cases 150 * perfom sanity checks and use them if all looks good. 151 */ 152 if (!initrd_start || initrd_end <= initrd_start) 153 goto disable; 154 155 if (initrd_start & ~PAGE_MASK) { 156 pr_err("initrd start must be page aligned\n"); 157 goto disable; 158 } 159 if (initrd_start < PAGE_OFFSET) { 160 pr_err("initrd start < PAGE_OFFSET\n"); 161 goto disable; 162 } 163 164 /* 165 * Sanitize initrd addresses. For example firmware 166 * can't guess if they need to pass them through 167 * 64-bits values if the kernel has been built in pure 168 * 32-bit. We need also to switch from KSEG0 to XKPHYS 169 * addresses now, so the code can now safely use __pa(). 170 */ 171 end = __pa(initrd_end); 172 initrd_end = (unsigned long)__va(end); 173 initrd_start = (unsigned long)__va(__pa(initrd_start)); 174 175 ROOT_DEV = Root_RAM0; 176 return PFN_UP(end); 177 disable: 178 initrd_start = 0; 179 initrd_end = 0; 180 return 0; 181 } 182 183 /* In some conditions (e.g. big endian bootloader with a little endian 184 kernel), the initrd might appear byte swapped. Try to detect this and 185 byte swap it if needed. */ 186 static void __init maybe_bswap_initrd(void) 187 { 188 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 189 u64 buf; 190 191 /* Check for CPIO signature */ 192 if (!memcmp((void *)initrd_start, "070701", 6)) 193 return; 194 195 /* Check for compressed initrd */ 196 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 197 return; 198 199 /* Try again with a byte swapped header */ 200 buf = swab64p((u64 *)initrd_start); 201 if (!memcmp(&buf, "070701", 6) || 202 decompress_method((unsigned char *)(&buf), 8, NULL)) { 203 unsigned long i; 204 205 pr_info("Byteswapped initrd detected\n"); 206 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 207 swab64s((u64 *)i); 208 } 209 #endif 210 } 211 212 static void __init finalize_initrd(void) 213 { 214 unsigned long size = initrd_end - initrd_start; 215 216 if (size == 0) { 217 printk(KERN_INFO "Initrd not found or empty"); 218 goto disable; 219 } 220 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 221 printk(KERN_ERR "Initrd extends beyond end of memory"); 222 goto disable; 223 } 224 225 maybe_bswap_initrd(); 226 227 memblock_reserve(__pa(initrd_start), size); 228 initrd_below_start_ok = 1; 229 230 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 231 initrd_start, size); 232 return; 233 disable: 234 printk(KERN_CONT " - disabling initrd\n"); 235 initrd_start = 0; 236 initrd_end = 0; 237 } 238 239 #else /* !CONFIG_BLK_DEV_INITRD */ 240 241 static unsigned long __init init_initrd(void) 242 { 243 return 0; 244 } 245 246 #define finalize_initrd() do {} while (0) 247 248 #endif 249 250 /* 251 * Initialize the bootmem allocator. It also setup initrd related data 252 * if needed. 253 */ 254 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA)) 255 256 static void __init bootmem_init(void) 257 { 258 init_initrd(); 259 finalize_initrd(); 260 } 261 262 #else /* !CONFIG_SGI_IP27 */ 263 264 static void __init bootmem_init(void) 265 { 266 phys_addr_t ramstart, ramend; 267 unsigned long start, end; 268 int i; 269 270 ramstart = memblock_start_of_DRAM(); 271 ramend = memblock_end_of_DRAM(); 272 273 /* 274 * Sanity check any INITRD first. We don't take it into account 275 * for bootmem setup initially, rely on the end-of-kernel-code 276 * as our memory range starting point. Once bootmem is inited we 277 * will reserve the area used for the initrd. 278 */ 279 init_initrd(); 280 281 /* Reserve memory occupied by kernel. */ 282 memblock_reserve(__pa_symbol(&_text), 283 __pa_symbol(&_end) - __pa_symbol(&_text)); 284 285 /* max_low_pfn is not a number of pages but the end pfn of low mem */ 286 287 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 288 ARCH_PFN_OFFSET = PFN_UP(ramstart); 289 #else 290 /* 291 * Reserve any memory between the start of RAM and PHYS_OFFSET 292 */ 293 if (ramstart > PHYS_OFFSET) 294 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 295 296 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) { 297 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 298 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)), 299 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET)); 300 } 301 #endif 302 303 min_low_pfn = ARCH_PFN_OFFSET; 304 max_pfn = PFN_DOWN(ramend); 305 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) { 306 /* 307 * Skip highmem here so we get an accurate max_low_pfn if low 308 * memory stops short of high memory. 309 * If the region overlaps HIGHMEM_START, end is clipped so 310 * max_pfn excludes the highmem portion. 311 */ 312 if (start >= PFN_DOWN(HIGHMEM_START)) 313 continue; 314 if (end > PFN_DOWN(HIGHMEM_START)) 315 end = PFN_DOWN(HIGHMEM_START); 316 if (end > max_low_pfn) 317 max_low_pfn = end; 318 } 319 320 if (min_low_pfn >= max_low_pfn) 321 panic("Incorrect memory mapping !!!"); 322 323 if (max_pfn > PFN_DOWN(HIGHMEM_START)) { 324 #ifdef CONFIG_HIGHMEM 325 highstart_pfn = PFN_DOWN(HIGHMEM_START); 326 highend_pfn = max_pfn; 327 #else 328 max_low_pfn = PFN_DOWN(HIGHMEM_START); 329 max_pfn = max_low_pfn; 330 #endif 331 } 332 333 /* 334 * Reserve initrd memory if needed. 335 */ 336 finalize_initrd(); 337 } 338 339 #endif /* CONFIG_SGI_IP27 */ 340 341 static int usermem __initdata; 342 343 static int __init early_parse_mem(char *p) 344 { 345 phys_addr_t start, size; 346 347 /* 348 * If a user specifies memory size, we 349 * blow away any automatically generated 350 * size. 351 */ 352 if (usermem == 0) { 353 usermem = 1; 354 memblock_remove(memblock_start_of_DRAM(), 355 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 356 } 357 start = 0; 358 size = memparse(p, &p); 359 if (*p == '@') 360 start = memparse(p + 1, &p); 361 362 memblock_add(start, size); 363 364 return 0; 365 } 366 early_param("mem", early_parse_mem); 367 368 static int __init early_parse_memmap(char *p) 369 { 370 char *oldp; 371 u64 start_at, mem_size; 372 373 if (!p) 374 return -EINVAL; 375 376 if (!strncmp(p, "exactmap", 8)) { 377 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 378 return 0; 379 } 380 381 oldp = p; 382 mem_size = memparse(p, &p); 383 if (p == oldp) 384 return -EINVAL; 385 386 if (*p == '@') { 387 start_at = memparse(p+1, &p); 388 memblock_add(start_at, mem_size); 389 } else if (*p == '#') { 390 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 391 return -EINVAL; 392 } else if (*p == '$') { 393 start_at = memparse(p+1, &p); 394 memblock_add(start_at, mem_size); 395 memblock_reserve(start_at, mem_size); 396 } else { 397 pr_err("\"memmap\" invalid format!\n"); 398 return -EINVAL; 399 } 400 401 if (*p == '\0') { 402 usermem = 1; 403 return 0; 404 } else 405 return -EINVAL; 406 } 407 early_param("memmap", early_parse_memmap); 408 409 static void __init mips_reserve_vmcore(void) 410 { 411 #ifdef CONFIG_PROC_VMCORE 412 phys_addr_t start, end; 413 u64 i; 414 415 if (!elfcorehdr_size) { 416 for_each_mem_range(i, &start, &end) { 417 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) { 418 /* 419 * Reserve from the elf core header to the end of 420 * the memory segment, that should all be kdump 421 * reserved memory. 422 */ 423 elfcorehdr_size = end - elfcorehdr_addr; 424 break; 425 } 426 } 427 } 428 429 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n", 430 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10); 431 432 memblock_reserve(elfcorehdr_addr, elfcorehdr_size); 433 #endif 434 } 435 436 #ifdef CONFIG_KEXEC 437 438 /* 64M alignment for crash kernel regions */ 439 #define CRASH_ALIGN SZ_64M 440 #define CRASH_ADDR_MAX SZ_512M 441 442 static void __init mips_parse_crashkernel(void) 443 { 444 unsigned long long total_mem; 445 unsigned long long crash_size, crash_base; 446 int ret; 447 448 total_mem = memblock_phys_mem_size(); 449 ret = parse_crashkernel(boot_command_line, total_mem, 450 &crash_size, &crash_base); 451 if (ret != 0 || crash_size <= 0) 452 return; 453 454 if (crash_base <= 0) { 455 crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX, 456 crash_size, CRASH_ALIGN); 457 if (!crash_base) { 458 pr_warn("crashkernel reservation failed - No suitable area found.\n"); 459 return; 460 } 461 } else { 462 unsigned long long start; 463 464 start = memblock_find_in_range(crash_base, crash_base + crash_size, 465 crash_size, 1); 466 if (start != crash_base) { 467 pr_warn("Invalid memory region reserved for crash kernel\n"); 468 return; 469 } 470 } 471 472 crashk_res.start = crash_base; 473 crashk_res.end = crash_base + crash_size - 1; 474 } 475 476 static void __init request_crashkernel(struct resource *res) 477 { 478 int ret; 479 480 if (crashk_res.start == crashk_res.end) 481 return; 482 483 ret = request_resource(res, &crashk_res); 484 if (!ret) 485 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 486 (unsigned long)(resource_size(&crashk_res) >> 20), 487 (unsigned long)(crashk_res.start >> 20)); 488 } 489 #else /* !defined(CONFIG_KEXEC) */ 490 static void __init mips_parse_crashkernel(void) 491 { 492 } 493 494 static void __init request_crashkernel(struct resource *res) 495 { 496 } 497 #endif /* !defined(CONFIG_KEXEC) */ 498 499 static void __init check_kernel_sections_mem(void) 500 { 501 phys_addr_t start = __pa_symbol(&_text); 502 phys_addr_t size = __pa_symbol(&_end) - start; 503 504 if (!memblock_is_region_memory(start, size)) { 505 pr_info("Kernel sections are not in the memory maps\n"); 506 memblock_add(start, size); 507 } 508 } 509 510 static void __init bootcmdline_append(const char *s, size_t max) 511 { 512 if (!s[0] || !max) 513 return; 514 515 if (boot_command_line[0]) 516 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 517 518 strlcat(boot_command_line, s, max); 519 } 520 521 #ifdef CONFIG_OF_EARLY_FLATTREE 522 523 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname, 524 int depth, void *data) 525 { 526 bool *dt_bootargs = data; 527 const char *p; 528 int l; 529 530 if (depth != 1 || !data || 531 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) 532 return 0; 533 534 p = of_get_flat_dt_prop(node, "bootargs", &l); 535 if (p != NULL && l > 0) { 536 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE)); 537 *dt_bootargs = true; 538 } 539 540 return 1; 541 } 542 543 #endif /* CONFIG_OF_EARLY_FLATTREE */ 544 545 static void __init bootcmdline_init(void) 546 { 547 bool dt_bootargs = false; 548 549 /* 550 * If CMDLINE_OVERRIDE is enabled then initializing the command line is 551 * trivial - we simply use the built-in command line unconditionally & 552 * unmodified. 553 */ 554 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 555 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 556 return; 557 } 558 559 /* 560 * If the user specified a built-in command line & 561 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is 562 * prepended to arguments from the bootloader or DT so we'll copy them 563 * to the start of boot_command_line here. Otherwise, empty 564 * boot_command_line to undo anything early_init_dt_scan_chosen() did. 565 */ 566 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 567 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 568 else 569 boot_command_line[0] = 0; 570 571 #ifdef CONFIG_OF_EARLY_FLATTREE 572 /* 573 * If we're configured to take boot arguments from DT, look for those 574 * now. 575 */ 576 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) || 577 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)) 578 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs); 579 #endif 580 581 /* 582 * If we didn't get any arguments from DT (regardless of whether that's 583 * because we weren't configured to look for them, or because we looked 584 * & found none) then we'll take arguments from the bootloader. 585 * plat_mem_setup() should have filled arcs_cmdline with arguments from 586 * the bootloader. 587 */ 588 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs) 589 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE); 590 591 /* 592 * If the user specified a built-in command line & we didn't already 593 * prepend it, we append it to boot_command_line here. 594 */ 595 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && 596 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 597 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE); 598 } 599 600 /* 601 * arch_mem_init - initialize memory management subsystem 602 * 603 * o plat_mem_setup() detects the memory configuration and will record detected 604 * memory areas using memblock_add. 605 * 606 * At this stage the memory configuration of the system is known to the 607 * kernel but generic memory management system is still entirely uninitialized. 608 * 609 * o bootmem_init() 610 * o sparse_init() 611 * o paging_init() 612 * o dma_contiguous_reserve() 613 * 614 * At this stage the bootmem allocator is ready to use. 615 * 616 * NOTE: historically plat_mem_setup did the entire platform initialization. 617 * This was rather impractical because it meant plat_mem_setup had to 618 * get away without any kind of memory allocator. To keep old code from 619 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 620 * initialization hook for anything else was introduced. 621 */ 622 static void __init arch_mem_init(char **cmdline_p) 623 { 624 /* call board setup routine */ 625 plat_mem_setup(); 626 memblock_set_bottom_up(true); 627 628 bootcmdline_init(); 629 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 630 *cmdline_p = command_line; 631 632 parse_early_param(); 633 634 if (usermem) 635 pr_info("User-defined physical RAM map overwrite\n"); 636 637 check_kernel_sections_mem(); 638 639 early_init_fdt_reserve_self(); 640 early_init_fdt_scan_reserved_mem(); 641 642 #ifndef CONFIG_NUMA 643 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); 644 #endif 645 bootmem_init(); 646 647 /* 648 * Prevent memblock from allocating high memory. 649 * This cannot be done before max_low_pfn is detected, so up 650 * to this point is possible to only reserve physical memory 651 * with memblock_reserve; memblock_alloc* can be used 652 * only after this point 653 */ 654 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 655 656 mips_reserve_vmcore(); 657 658 mips_parse_crashkernel(); 659 #ifdef CONFIG_KEXEC 660 if (crashk_res.start != crashk_res.end) 661 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 662 #endif 663 device_tree_init(); 664 665 /* 666 * In order to reduce the possibility of kernel panic when failed to 667 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 668 * low memory as small as possible before plat_swiotlb_setup(), so 669 * make sparse_init() using top-down allocation. 670 */ 671 memblock_set_bottom_up(false); 672 sparse_init(); 673 memblock_set_bottom_up(true); 674 675 plat_swiotlb_setup(); 676 677 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 678 679 /* Reserve for hibernation. */ 680 memblock_reserve(__pa_symbol(&__nosave_begin), 681 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); 682 683 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 684 } 685 686 static void __init resource_init(void) 687 { 688 phys_addr_t start, end; 689 u64 i; 690 691 if (UNCAC_BASE != IO_BASE) 692 return; 693 694 code_resource.start = __pa_symbol(&_text); 695 code_resource.end = __pa_symbol(&_etext) - 1; 696 data_resource.start = __pa_symbol(&_etext); 697 data_resource.end = __pa_symbol(&_edata) - 1; 698 bss_resource.start = __pa_symbol(&__bss_start); 699 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 700 701 for_each_mem_range(i, &start, &end) { 702 struct resource *res; 703 704 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 705 if (!res) 706 panic("%s: Failed to allocate %zu bytes\n", __func__, 707 sizeof(struct resource)); 708 709 res->start = start; 710 /* 711 * In memblock, end points to the first byte after the 712 * range while in resourses, end points to the last byte in 713 * the range. 714 */ 715 res->end = end - 1; 716 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 717 res->name = "System RAM"; 718 719 request_resource(&iomem_resource, res); 720 721 /* 722 * We don't know which RAM region contains kernel data, 723 * so we try it repeatedly and let the resource manager 724 * test it. 725 */ 726 request_resource(res, &code_resource); 727 request_resource(res, &data_resource); 728 request_resource(res, &bss_resource); 729 request_crashkernel(res); 730 } 731 } 732 733 #ifdef CONFIG_SMP 734 static void __init prefill_possible_map(void) 735 { 736 int i, possible = num_possible_cpus(); 737 738 if (possible > nr_cpu_ids) 739 possible = nr_cpu_ids; 740 741 for (i = 0; i < possible; i++) 742 set_cpu_possible(i, true); 743 for (; i < NR_CPUS; i++) 744 set_cpu_possible(i, false); 745 746 nr_cpu_ids = possible; 747 } 748 #else 749 static inline void prefill_possible_map(void) {} 750 #endif 751 752 void __init setup_arch(char **cmdline_p) 753 { 754 cpu_probe(); 755 mips_cm_probe(); 756 prom_init(); 757 758 setup_early_fdc_console(); 759 #ifdef CONFIG_EARLY_PRINTK 760 setup_early_printk(); 761 #endif 762 cpu_report(); 763 check_bugs_early(); 764 765 #if defined(CONFIG_VT) 766 #if defined(CONFIG_VGA_CONSOLE) 767 conswitchp = &vga_con; 768 #endif 769 #endif 770 771 arch_mem_init(cmdline_p); 772 dmi_setup(); 773 774 resource_init(); 775 plat_smp_setup(); 776 prefill_possible_map(); 777 778 cpu_cache_init(); 779 paging_init(); 780 781 memblock_dump_all(); 782 } 783 784 unsigned long kernelsp[NR_CPUS]; 785 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 786 787 #ifdef CONFIG_DEBUG_FS 788 struct dentry *mips_debugfs_dir; 789 static int __init debugfs_mips(void) 790 { 791 mips_debugfs_dir = debugfs_create_dir("mips", NULL); 792 return 0; 793 } 794 arch_initcall(debugfs_mips); 795 #endif 796 797 #ifdef CONFIG_DMA_NONCOHERENT 798 static int __init setcoherentio(char *str) 799 { 800 dma_default_coherent = true; 801 pr_info("Hardware DMA cache coherency (command line)\n"); 802 return 0; 803 } 804 early_param("coherentio", setcoherentio); 805 806 static int __init setnocoherentio(char *str) 807 { 808 dma_default_coherent = true; 809 pr_info("Software DMA cache coherency (command line)\n"); 810 return 0; 811 } 812 early_param("nocoherentio", setnocoherentio); 813 #endif 814