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/of_reserved_mem.h> 31 #include <linux/dmi.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/dma-coherence.h> 41 #include <asm/sections.h> 42 #include <asm/setup.h> 43 #include <asm/smp-ops.h> 44 #include <asm/prom.h> 45 46 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB 47 const char __section(".appended_dtb") __appended_dtb[0x100000]; 48 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ 49 50 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 51 52 EXPORT_SYMBOL(cpu_data); 53 54 #ifdef CONFIG_VT 55 struct screen_info screen_info; 56 #endif 57 58 /* 59 * Setup information 60 * 61 * These are initialized so they are in the .data section 62 */ 63 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN; 64 65 EXPORT_SYMBOL(mips_machtype); 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 const char builtin_cmdline[] __initconst = CONFIG_CMDLINE; 72 #else 73 static const char builtin_cmdline[] __initconst = ""; 74 #endif 75 76 /* 77 * mips_io_port_base is the begin of the address space to which x86 style 78 * I/O ports are mapped. 79 */ 80 unsigned long mips_io_port_base = -1; 81 EXPORT_SYMBOL(mips_io_port_base); 82 83 static struct resource code_resource = { .name = "Kernel code", }; 84 static struct resource data_resource = { .name = "Kernel data", }; 85 static struct resource bss_resource = { .name = "Kernel bss", }; 86 87 static void *detect_magic __initdata = detect_memory_region; 88 89 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 90 unsigned long ARCH_PFN_OFFSET; 91 EXPORT_SYMBOL(ARCH_PFN_OFFSET); 92 #endif 93 94 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 95 { 96 void *dm = &detect_magic; 97 phys_addr_t size; 98 99 for (size = sz_min; size < sz_max; size <<= 1) { 100 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 101 break; 102 } 103 104 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 105 ((unsigned long long) size) / SZ_1M, 106 (unsigned long long) start, 107 ((unsigned long long) sz_min) / SZ_1M, 108 ((unsigned long long) sz_max) / SZ_1M); 109 110 memblock_add(start, size); 111 } 112 113 /* 114 * Manage initrd 115 */ 116 #ifdef CONFIG_BLK_DEV_INITRD 117 118 static int __init rd_start_early(char *p) 119 { 120 unsigned long start = memparse(p, &p); 121 122 #ifdef CONFIG_64BIT 123 /* Guess if the sign extension was forgotten by bootloader */ 124 if (start < XKPHYS) 125 start = (int)start; 126 #endif 127 initrd_start = start; 128 initrd_end += start; 129 return 0; 130 } 131 early_param("rd_start", rd_start_early); 132 133 static int __init rd_size_early(char *p) 134 { 135 initrd_end += memparse(p, &p); 136 return 0; 137 } 138 early_param("rd_size", rd_size_early); 139 140 /* it returns the next free pfn after initrd */ 141 static unsigned long __init init_initrd(void) 142 { 143 unsigned long end; 144 145 /* 146 * Board specific code or command line parser should have 147 * already set up initrd_start and initrd_end. In these cases 148 * perfom sanity checks and use them if all looks good. 149 */ 150 if (!initrd_start || initrd_end <= initrd_start) 151 goto disable; 152 153 if (initrd_start & ~PAGE_MASK) { 154 pr_err("initrd start must be page aligned\n"); 155 goto disable; 156 } 157 if (initrd_start < PAGE_OFFSET) { 158 pr_err("initrd start < PAGE_OFFSET\n"); 159 goto disable; 160 } 161 162 /* 163 * Sanitize initrd addresses. For example firmware 164 * can't guess if they need to pass them through 165 * 64-bits values if the kernel has been built in pure 166 * 32-bit. We need also to switch from KSEG0 to XKPHYS 167 * addresses now, so the code can now safely use __pa(). 168 */ 169 end = __pa(initrd_end); 170 initrd_end = (unsigned long)__va(end); 171 initrd_start = (unsigned long)__va(__pa(initrd_start)); 172 173 ROOT_DEV = Root_RAM0; 174 return PFN_UP(end); 175 disable: 176 initrd_start = 0; 177 initrd_end = 0; 178 return 0; 179 } 180 181 /* In some conditions (e.g. big endian bootloader with a little endian 182 kernel), the initrd might appear byte swapped. Try to detect this and 183 byte swap it if needed. */ 184 static void __init maybe_bswap_initrd(void) 185 { 186 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 187 u64 buf; 188 189 /* Check for CPIO signature */ 190 if (!memcmp((void *)initrd_start, "070701", 6)) 191 return; 192 193 /* Check for compressed initrd */ 194 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 195 return; 196 197 /* Try again with a byte swapped header */ 198 buf = swab64p((u64 *)initrd_start); 199 if (!memcmp(&buf, "070701", 6) || 200 decompress_method((unsigned char *)(&buf), 8, NULL)) { 201 unsigned long i; 202 203 pr_info("Byteswapped initrd detected\n"); 204 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 205 swab64s((u64 *)i); 206 } 207 #endif 208 } 209 210 static void __init finalize_initrd(void) 211 { 212 unsigned long size = initrd_end - initrd_start; 213 214 if (size == 0) { 215 printk(KERN_INFO "Initrd not found or empty"); 216 goto disable; 217 } 218 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 219 printk(KERN_ERR "Initrd extends beyond end of memory"); 220 goto disable; 221 } 222 223 maybe_bswap_initrd(); 224 225 memblock_reserve(__pa(initrd_start), size); 226 initrd_below_start_ok = 1; 227 228 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 229 initrd_start, size); 230 return; 231 disable: 232 printk(KERN_CONT " - disabling initrd\n"); 233 initrd_start = 0; 234 initrd_end = 0; 235 } 236 237 #else /* !CONFIG_BLK_DEV_INITRD */ 238 239 static unsigned long __init init_initrd(void) 240 { 241 return 0; 242 } 243 244 #define finalize_initrd() do {} while (0) 245 246 #endif 247 248 /* 249 * Initialize the bootmem allocator. It also setup initrd related data 250 * if needed. 251 */ 252 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA)) 253 254 static void __init bootmem_init(void) 255 { 256 init_initrd(); 257 finalize_initrd(); 258 } 259 260 #else /* !CONFIG_SGI_IP27 */ 261 262 static void __init bootmem_init(void) 263 { 264 phys_addr_t ramstart, ramend; 265 unsigned long start, end; 266 int i; 267 268 ramstart = memblock_start_of_DRAM(); 269 ramend = memblock_end_of_DRAM(); 270 271 /* 272 * Sanity check any INITRD first. We don't take it into account 273 * for bootmem setup initially, rely on the end-of-kernel-code 274 * as our memory range starting point. Once bootmem is inited we 275 * will reserve the area used for the initrd. 276 */ 277 init_initrd(); 278 279 /* Reserve memory occupied by kernel. */ 280 memblock_reserve(__pa_symbol(&_text), 281 __pa_symbol(&_end) - __pa_symbol(&_text)); 282 283 /* max_low_pfn is not a number of pages but the end pfn of low mem */ 284 285 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 286 ARCH_PFN_OFFSET = PFN_UP(ramstart); 287 #else 288 /* 289 * Reserve any memory between the start of RAM and PHYS_OFFSET 290 */ 291 if (ramstart > PHYS_OFFSET) 292 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 293 294 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) { 295 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 296 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)), 297 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET)); 298 } 299 #endif 300 301 min_low_pfn = ARCH_PFN_OFFSET; 302 max_pfn = PFN_DOWN(ramend); 303 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) { 304 /* 305 * Skip highmem here so we get an accurate max_low_pfn if low 306 * memory stops short of high memory. 307 * If the region overlaps HIGHMEM_START, end is clipped so 308 * max_pfn excludes the highmem portion. 309 */ 310 if (start >= PFN_DOWN(HIGHMEM_START)) 311 continue; 312 if (end > PFN_DOWN(HIGHMEM_START)) 313 end = PFN_DOWN(HIGHMEM_START); 314 if (end > max_low_pfn) 315 max_low_pfn = end; 316 } 317 318 if (min_low_pfn >= max_low_pfn) 319 panic("Incorrect memory mapping !!!"); 320 321 if (max_pfn > PFN_DOWN(HIGHMEM_START)) { 322 #ifdef CONFIG_HIGHMEM 323 highstart_pfn = PFN_DOWN(HIGHMEM_START); 324 highend_pfn = max_pfn; 325 #else 326 max_low_pfn = PFN_DOWN(HIGHMEM_START); 327 max_pfn = max_low_pfn; 328 #endif 329 } 330 331 /* 332 * Reserve initrd memory if needed. 333 */ 334 finalize_initrd(); 335 } 336 337 #endif /* CONFIG_SGI_IP27 */ 338 339 static int usermem __initdata; 340 341 static int __init early_parse_mem(char *p) 342 { 343 phys_addr_t start, size; 344 345 /* 346 * If a user specifies memory size, we 347 * blow away any automatically generated 348 * size. 349 */ 350 if (usermem == 0) { 351 usermem = 1; 352 memblock_remove(memblock_start_of_DRAM(), 353 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 354 } 355 start = 0; 356 size = memparse(p, &p); 357 if (*p == '@') 358 start = memparse(p + 1, &p); 359 360 memblock_add(start, size); 361 362 return 0; 363 } 364 early_param("mem", early_parse_mem); 365 366 static int __init early_parse_memmap(char *p) 367 { 368 char *oldp; 369 u64 start_at, mem_size; 370 371 if (!p) 372 return -EINVAL; 373 374 if (!strncmp(p, "exactmap", 8)) { 375 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 376 return 0; 377 } 378 379 oldp = p; 380 mem_size = memparse(p, &p); 381 if (p == oldp) 382 return -EINVAL; 383 384 if (*p == '@') { 385 start_at = memparse(p+1, &p); 386 memblock_add(start_at, mem_size); 387 } else if (*p == '#') { 388 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 389 return -EINVAL; 390 } else if (*p == '$') { 391 start_at = memparse(p+1, &p); 392 memblock_add(start_at, mem_size); 393 memblock_reserve(start_at, mem_size); 394 } else { 395 pr_err("\"memmap\" invalid format!\n"); 396 return -EINVAL; 397 } 398 399 if (*p == '\0') { 400 usermem = 1; 401 return 0; 402 } else 403 return -EINVAL; 404 } 405 early_param("memmap", early_parse_memmap); 406 407 #ifdef CONFIG_PROC_VMCORE 408 static unsigned long setup_elfcorehdr, setup_elfcorehdr_size; 409 static int __init early_parse_elfcorehdr(char *p) 410 { 411 phys_addr_t start, end; 412 u64 i; 413 414 setup_elfcorehdr = memparse(p, &p); 415 416 for_each_mem_range(i, &start, &end) { 417 if (setup_elfcorehdr >= start && setup_elfcorehdr < 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 setup_elfcorehdr_size = end - setup_elfcorehdr; 424 break; 425 } 426 } 427 /* 428 * If we don't find it in the memory map, then we shouldn't 429 * have to worry about it, as the new kernel won't use it. 430 */ 431 return 0; 432 } 433 early_param("elfcorehdr", early_parse_elfcorehdr); 434 #endif 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 #ifdef CONFIG_PROC_VMCORE 657 if (setup_elfcorehdr && setup_elfcorehdr_size) { 658 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n", 659 setup_elfcorehdr, setup_elfcorehdr_size); 660 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size); 661 } 662 #endif 663 664 mips_parse_crashkernel(); 665 #ifdef CONFIG_KEXEC 666 if (crashk_res.start != crashk_res.end) 667 memblock_reserve(crashk_res.start, resource_size(&crashk_res)); 668 #endif 669 device_tree_init(); 670 671 /* 672 * In order to reduce the possibility of kernel panic when failed to 673 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 674 * low memory as small as possible before plat_swiotlb_setup(), so 675 * make sparse_init() using top-down allocation. 676 */ 677 memblock_set_bottom_up(false); 678 sparse_init(); 679 memblock_set_bottom_up(true); 680 681 plat_swiotlb_setup(); 682 683 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 684 685 /* Reserve for hibernation. */ 686 memblock_reserve(__pa_symbol(&__nosave_begin), 687 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); 688 689 fdt_init_reserved_mem(); 690 691 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 692 } 693 694 static void __init resource_init(void) 695 { 696 phys_addr_t start, end; 697 u64 i; 698 699 if (UNCAC_BASE != IO_BASE) 700 return; 701 702 code_resource.start = __pa_symbol(&_text); 703 code_resource.end = __pa_symbol(&_etext) - 1; 704 data_resource.start = __pa_symbol(&_etext); 705 data_resource.end = __pa_symbol(&_edata) - 1; 706 bss_resource.start = __pa_symbol(&__bss_start); 707 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 708 709 for_each_mem_range(i, &start, &end) { 710 struct resource *res; 711 712 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 713 if (!res) 714 panic("%s: Failed to allocate %zu bytes\n", __func__, 715 sizeof(struct resource)); 716 717 res->start = start; 718 /* 719 * In memblock, end points to the first byte after the 720 * range while in resourses, end points to the last byte in 721 * the range. 722 */ 723 res->end = end - 1; 724 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 725 res->name = "System RAM"; 726 727 request_resource(&iomem_resource, res); 728 729 /* 730 * We don't know which RAM region contains kernel data, 731 * so we try it repeatedly and let the resource manager 732 * test it. 733 */ 734 request_resource(res, &code_resource); 735 request_resource(res, &data_resource); 736 request_resource(res, &bss_resource); 737 request_crashkernel(res); 738 } 739 } 740 741 #ifdef CONFIG_SMP 742 static void __init prefill_possible_map(void) 743 { 744 int i, possible = num_possible_cpus(); 745 746 if (possible > nr_cpu_ids) 747 possible = nr_cpu_ids; 748 749 for (i = 0; i < possible; i++) 750 set_cpu_possible(i, true); 751 for (; i < NR_CPUS; i++) 752 set_cpu_possible(i, false); 753 754 nr_cpu_ids = possible; 755 } 756 #else 757 static inline void prefill_possible_map(void) {} 758 #endif 759 760 void __init setup_arch(char **cmdline_p) 761 { 762 cpu_probe(); 763 mips_cm_probe(); 764 prom_init(); 765 766 setup_early_fdc_console(); 767 #ifdef CONFIG_EARLY_PRINTK 768 setup_early_printk(); 769 #endif 770 cpu_report(); 771 check_bugs_early(); 772 773 #if defined(CONFIG_VT) 774 #if defined(CONFIG_VGA_CONSOLE) 775 conswitchp = &vga_con; 776 #endif 777 #endif 778 779 arch_mem_init(cmdline_p); 780 dmi_setup(); 781 782 resource_init(); 783 plat_smp_setup(); 784 prefill_possible_map(); 785 786 cpu_cache_init(); 787 paging_init(); 788 789 memblock_dump_all(); 790 } 791 792 unsigned long kernelsp[NR_CPUS]; 793 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 794 795 #ifdef CONFIG_USE_OF 796 unsigned long fw_passed_dtb; 797 #endif 798 799 #ifdef CONFIG_DEBUG_FS 800 struct dentry *mips_debugfs_dir; 801 static int __init debugfs_mips(void) 802 { 803 mips_debugfs_dir = debugfs_create_dir("mips", NULL); 804 return 0; 805 } 806 arch_initcall(debugfs_mips); 807 #endif 808 809 #ifdef CONFIG_DMA_MAYBE_COHERENT 810 /* User defined DMA coherency from command line. */ 811 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT; 812 EXPORT_SYMBOL_GPL(coherentio); 813 int hw_coherentio; /* Actual hardware supported DMA coherency setting. */ 814 815 static int __init setcoherentio(char *str) 816 { 817 coherentio = IO_COHERENCE_ENABLED; 818 pr_info("Hardware DMA cache coherency (command line)\n"); 819 return 0; 820 } 821 early_param("coherentio", setcoherentio); 822 823 static int __init setnocoherentio(char *str) 824 { 825 coherentio = IO_COHERENCE_DISABLED; 826 pr_info("Software DMA cache coherency (command line)\n"); 827 return 0; 828 } 829 early_param("nocoherentio", setnocoherentio); 830 #endif 831