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/cpu.h> 15 #include <linux/delay.h> 16 #include <linux/hex.h> 17 #include <linux/ioport.h> 18 #include <linux/export.h> 19 #include <linux/memblock.h> 20 #include <linux/initrd.h> 21 #include <linux/root_dev.h> 22 #include <linux/highmem.h> 23 #include <linux/console.h> 24 #include <linux/pfn.h> 25 #include <linux/debugfs.h> 26 #include <linux/kexec.h> 27 #include <linux/sizes.h> 28 #include <linux/device.h> 29 #include <linux/dma-map-ops.h> 30 #include <linux/decompress/generic.h> 31 #include <linux/of_fdt.h> 32 #include <linux/dmi.h> 33 #include <linux/crash_dump.h> 34 35 #include <asm/addrspace.h> 36 #include <asm/bootinfo.h> 37 #include <asm/bugs.h> 38 #include <asm/cache.h> 39 #include <asm/cdmm.h> 40 #include <asm/cpu.h> 41 #include <asm/debug.h> 42 #include <asm/mmzone.h> 43 #include <asm/sections.h> 44 #include <asm/setup.h> 45 #include <asm/smp-ops.h> 46 #include <asm/mips-cps.h> 47 #include <asm/prom.h> 48 #include <asm/fw/fw.h> 49 50 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB 51 char __section(".appended_dtb") __appended_dtb[0x100000]; 52 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ 53 54 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 55 56 EXPORT_SYMBOL(cpu_data); 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 unsigned long __kaslr_offset __ro_after_init; 88 EXPORT_SYMBOL(__kaslr_offset); 89 90 static void *detect_magic __initdata = detect_memory_region; 91 92 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 93 unsigned long ARCH_PFN_OFFSET; 94 EXPORT_SYMBOL(ARCH_PFN_OFFSET); 95 #endif 96 97 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max) 98 { 99 void *dm = &detect_magic; 100 phys_addr_t size; 101 102 for (size = sz_min; size < sz_max; size <<= 1) { 103 if (!memcmp(dm, dm + size, sizeof(detect_magic))) 104 break; 105 } 106 107 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n", 108 ((unsigned long long) size) / SZ_1M, 109 (unsigned long long) start, 110 ((unsigned long long) sz_min) / SZ_1M, 111 ((unsigned long long) sz_max) / SZ_1M); 112 113 memblock_add(start, size); 114 } 115 116 /* 117 * Manage initrd 118 */ 119 #ifdef CONFIG_BLK_DEV_INITRD 120 121 static int __init rd_start_early(char *p) 122 { 123 unsigned long start = memparse(p, &p); 124 125 #ifdef CONFIG_64BIT 126 /* Guess if the sign extension was forgotten by bootloader */ 127 if (start < XKPHYS) 128 start = (int)start; 129 #endif 130 initrd_start = start; 131 initrd_end += start; 132 return 0; 133 } 134 early_param("rd_start", rd_start_early); 135 136 static int __init rd_size_early(char *p) 137 { 138 initrd_end += memparse(p, &p); 139 return 0; 140 } 141 early_param("rd_size", rd_size_early); 142 143 /* it returns the next free pfn after initrd */ 144 static unsigned long __init init_initrd(void) 145 { 146 unsigned long end; 147 148 /* 149 * Board specific code or command line parser should have 150 * already set up initrd_start and initrd_end. In these cases 151 * perform sanity checks and use them if all looks good. 152 */ 153 if (!initrd_start || initrd_end <= initrd_start) 154 goto disable; 155 156 if (initrd_start & ~PAGE_MASK) { 157 pr_err("initrd start must be page aligned\n"); 158 goto disable; 159 } 160 161 /* 162 * Sanitize initrd addresses. For example firmware 163 * can't guess if they need to pass them through 164 * 64-bits values if the kernel has been built in pure 165 * 32-bit. We need also to switch from KSEG0 to XKPHYS 166 * addresses now, so the code can now safely use __pa(). 167 */ 168 end = __pa(initrd_end); 169 initrd_end = (unsigned long)__va(end); 170 initrd_start = (unsigned long)__va(__pa(initrd_start)); 171 172 if (initrd_start < PAGE_OFFSET) { 173 pr_err("initrd start < PAGE_OFFSET\n"); 174 goto disable; 175 } 176 177 ROOT_DEV = Root_RAM0; 178 return PFN_UP(end); 179 disable: 180 initrd_start = 0; 181 initrd_end = 0; 182 return 0; 183 } 184 185 /* In some conditions (e.g. big endian bootloader with a little endian 186 kernel), the initrd might appear byte swapped. Try to detect this and 187 byte swap it if needed. */ 188 static void __init maybe_bswap_initrd(void) 189 { 190 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 191 u64 buf; 192 193 /* Check for CPIO signature */ 194 if (!memcmp((void *)initrd_start, "070701", 6)) 195 return; 196 197 /* Check for compressed initrd */ 198 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 199 return; 200 201 /* Try again with a byte swapped header */ 202 buf = swab64p((u64 *)initrd_start); 203 if (!memcmp(&buf, "070701", 6) || 204 decompress_method((unsigned char *)(&buf), 8, NULL)) { 205 unsigned long i; 206 207 pr_info("Byteswapped initrd detected\n"); 208 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 209 swab64s((u64 *)i); 210 } 211 #endif 212 } 213 214 static void __init finalize_initrd(void) 215 { 216 unsigned long size = initrd_end - initrd_start; 217 218 if (size == 0) { 219 printk(KERN_INFO "Initrd not found or empty"); 220 goto disable; 221 } 222 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 223 printk(KERN_ERR "Initrd extends beyond end of memory"); 224 goto disable; 225 } 226 227 maybe_bswap_initrd(); 228 229 memblock_reserve(__pa(initrd_start), size); 230 initrd_below_start_ok = 1; 231 232 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 233 initrd_start, size); 234 return; 235 disable: 236 printk(KERN_CONT " - disabling initrd\n"); 237 initrd_start = 0; 238 initrd_end = 0; 239 } 240 241 #else /* !CONFIG_BLK_DEV_INITRD */ 242 243 static unsigned long __init init_initrd(void) 244 { 245 return 0; 246 } 247 248 #define finalize_initrd() do {} while (0) 249 250 #endif 251 252 /* 253 * Initialize the bootmem allocator. It also setup initrd related data 254 * if needed. 255 */ 256 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA)) 257 258 static void __init bootmem_init(void) 259 { 260 init_initrd(); 261 finalize_initrd(); 262 } 263 264 #else /* !CONFIG_SGI_IP27 */ 265 266 static void __init bootmem_init(void) 267 { 268 phys_addr_t ramstart, ramend; 269 unsigned long start, end; 270 int i; 271 272 ramstart = memblock_start_of_DRAM(); 273 ramend = memblock_end_of_DRAM(); 274 275 /* 276 * Sanity check any INITRD first. We don't take it into account 277 * for bootmem setup initially, rely on the end-of-kernel-code 278 * as our memory range starting point. Once bootmem is inited we 279 * will reserve the area used for the initrd. 280 */ 281 init_initrd(); 282 283 /* Reserve memory occupied by kernel. */ 284 memblock_reserve(__pa_symbol(&_text), 285 __pa_symbol(&_end) - __pa_symbol(&_text)); 286 287 /* max_low_pfn is not a number of pages but the end pfn of low mem */ 288 289 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 290 ARCH_PFN_OFFSET = PFN_UP(ramstart); 291 #else 292 /* 293 * Reserve any memory between the start of RAM and PHYS_OFFSET 294 */ 295 if (ramstart > PHYS_OFFSET) 296 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 297 298 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) { 299 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 300 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)), 301 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET)); 302 } 303 #endif 304 305 min_low_pfn = ARCH_PFN_OFFSET; 306 max_pfn = PFN_DOWN(ramend); 307 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) { 308 /* 309 * Skip highmem here so we get an accurate max_low_pfn if low 310 * memory stops short of high memory. 311 * If the region overlaps HIGHMEM_START, end is clipped so 312 * max_pfn excludes the highmem portion. 313 */ 314 if (start >= PFN_DOWN(HIGHMEM_START)) 315 continue; 316 if (end > PFN_DOWN(HIGHMEM_START)) 317 end = PFN_DOWN(HIGHMEM_START); 318 if (end > max_low_pfn) 319 max_low_pfn = end; 320 } 321 322 if (min_low_pfn >= max_low_pfn) 323 panic("Incorrect memory mapping !!!"); 324 325 if (max_pfn > PFN_DOWN(HIGHMEM_START)) { 326 max_low_pfn = PFN_DOWN(HIGHMEM_START); 327 #ifdef CONFIG_HIGHMEM 328 highstart_pfn = max_low_pfn; 329 highend_pfn = max_pfn; 330 #else 331 max_pfn = max_low_pfn; 332 #endif 333 } 334 335 /* 336 * Reserve initrd memory if needed. 337 */ 338 finalize_initrd(); 339 } 340 341 #endif /* CONFIG_SGI_IP27 */ 342 343 static int usermem __initdata; 344 345 static int __init early_parse_mem(char *p) 346 { 347 phys_addr_t start, size; 348 349 if (!p) { 350 pr_err("mem parameter is empty, do nothing\n"); 351 return -EINVAL; 352 } 353 354 /* 355 * If a user specifies memory size, we 356 * blow away any automatically generated 357 * size. 358 */ 359 if (usermem == 0) { 360 usermem = 1; 361 memblock_remove(memblock_start_of_DRAM(), 362 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 363 } 364 start = 0; 365 size = memparse(p, &p); 366 if (*p == '@') 367 start = memparse(p + 1, &p); 368 369 if (IS_ENABLED(CONFIG_NUMA)) 370 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE); 371 else 372 memblock_add(start, size); 373 374 return 0; 375 } 376 early_param("mem", early_parse_mem); 377 378 static int __init early_parse_memmap(char *p) 379 { 380 char *oldp; 381 u64 start_at, mem_size; 382 383 if (!p) 384 return -EINVAL; 385 386 if (!strncmp(p, "exactmap", 8)) { 387 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 388 return 0; 389 } 390 391 oldp = p; 392 mem_size = memparse(p, &p); 393 if (p == oldp) 394 return -EINVAL; 395 396 if (*p == '@') { 397 start_at = memparse(p+1, &p); 398 memblock_add(start_at, mem_size); 399 } else if (*p == '#') { 400 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 401 return -EINVAL; 402 } else if (*p == '$') { 403 start_at = memparse(p+1, &p); 404 memblock_add(start_at, mem_size); 405 memblock_reserve(start_at, mem_size); 406 } else { 407 pr_err("\"memmap\" invalid format!\n"); 408 return -EINVAL; 409 } 410 411 if (*p == '\0') { 412 usermem = 1; 413 return 0; 414 } else 415 return -EINVAL; 416 } 417 early_param("memmap", early_parse_memmap); 418 419 static void __init mips_reserve_vmcore(void) 420 { 421 #ifdef CONFIG_PROC_VMCORE 422 phys_addr_t start, end; 423 u64 i; 424 425 if (!elfcorehdr_size) { 426 for_each_mem_range(i, &start, &end) { 427 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) { 428 /* 429 * Reserve from the elf core header to the end of 430 * the memory segment, that should all be kdump 431 * reserved memory. 432 */ 433 elfcorehdr_size = end - elfcorehdr_addr; 434 break; 435 } 436 } 437 } 438 439 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n", 440 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10); 441 442 memblock_reserve(elfcorehdr_addr, elfcorehdr_size); 443 #endif 444 } 445 446 /* 64M alignment for crash kernel regions */ 447 #define CRASH_ALIGN SZ_64M 448 #define CRASH_ADDR_MAX SZ_512M 449 450 static void __init mips_parse_crashkernel(void) 451 { 452 unsigned long long total_mem; 453 unsigned long long crash_size, crash_base; 454 int ret; 455 456 if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) 457 return; 458 459 total_mem = memblock_phys_mem_size(); 460 ret = parse_crashkernel(boot_command_line, total_mem, 461 &crash_size, &crash_base, 462 NULL, NULL, NULL); 463 if (ret != 0 || crash_size <= 0) 464 return; 465 466 if (crash_base <= 0) { 467 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, 468 CRASH_ALIGN, 469 CRASH_ADDR_MAX); 470 if (!crash_base) { 471 pr_warn("crashkernel reservation failed - No suitable area found.\n"); 472 return; 473 } 474 } else { 475 unsigned long long start; 476 477 start = memblock_phys_alloc_range(crash_size, 1, 478 crash_base, 479 crash_base + crash_size); 480 if (start != crash_base) { 481 pr_warn("Invalid memory region reserved for crash kernel\n"); 482 return; 483 } 484 } 485 486 crashk_res.start = crash_base; 487 crashk_res.end = crash_base + crash_size - 1; 488 } 489 490 static void __init request_crashkernel(struct resource *res) 491 { 492 int ret; 493 494 if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) 495 return; 496 497 if (crashk_res.start == crashk_res.end) 498 return; 499 500 ret = request_resource(res, &crashk_res); 501 if (!ret) 502 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 503 (unsigned long)(resource_size(&crashk_res) >> 20), 504 (unsigned long)(crashk_res.start >> 20)); 505 } 506 507 static void __init check_kernel_sections_mem(void) 508 { 509 phys_addr_t start = __pa_symbol(&_text); 510 phys_addr_t size = __pa_symbol(&_end) - start; 511 512 if (!memblock_is_region_memory(start, size)) { 513 pr_info("Kernel sections are not in the memory maps\n"); 514 memblock_add(start, size); 515 } 516 } 517 518 static void __init bootcmdline_append(const char *s, size_t max) 519 { 520 if (!s[0] || !max) 521 return; 522 523 if (boot_command_line[0]) 524 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 525 526 strlcat(boot_command_line, s, max); 527 } 528 529 #ifdef CONFIG_OF_EARLY_FLATTREE 530 531 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname, 532 int depth, void *data) 533 { 534 bool *dt_bootargs = data; 535 const char *p; 536 int l; 537 538 if (depth != 1 || !data || 539 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) 540 return 0; 541 542 p = of_get_flat_dt_prop(node, "bootargs", &l); 543 if (p != NULL && l > 0) { 544 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE)); 545 *dt_bootargs = true; 546 } 547 548 return 1; 549 } 550 551 #endif /* CONFIG_OF_EARLY_FLATTREE */ 552 553 static void __init bootcmdline_init(void) 554 { 555 bool dt_bootargs = false; 556 557 /* 558 * If CMDLINE_OVERRIDE is enabled then initializing the command line is 559 * trivial - we simply use the built-in command line unconditionally & 560 * unmodified. 561 */ 562 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 563 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 564 return; 565 } 566 567 /* 568 * If the user specified a built-in command line & 569 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is 570 * prepended to arguments from the bootloader or DT so we'll copy them 571 * to the start of boot_command_line here. Otherwise, empty 572 * boot_command_line to undo anything early_init_dt_scan_chosen() did. 573 */ 574 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 575 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 576 else 577 boot_command_line[0] = 0; 578 579 #ifdef CONFIG_OF_EARLY_FLATTREE 580 /* 581 * If we're configured to take boot arguments from DT, look for those 582 * now. 583 */ 584 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) || 585 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)) 586 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs); 587 #endif 588 589 /* 590 * If we didn't get any arguments from DT (regardless of whether that's 591 * because we weren't configured to look for them, or because we looked 592 * & found none) then we'll take arguments from the bootloader. 593 * plat_mem_setup() should have filled arcs_cmdline with arguments from 594 * the bootloader. 595 */ 596 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs) 597 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE); 598 599 /* 600 * If the user specified a built-in command line & we didn't already 601 * prepend it, we append it to boot_command_line here. 602 */ 603 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && 604 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 605 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE); 606 } 607 608 /* 609 * arch_mem_init - initialize memory management subsystem 610 * 611 * o plat_mem_setup() detects the memory configuration and will record detected 612 * memory areas using memblock_add. 613 * 614 * At this stage the memory configuration of the system is known to the 615 * kernel but generic memory management system is still entirely uninitialized. 616 * 617 * o bootmem_init() 618 * o sparse_init() 619 * o paging_init() 620 * o dma_contiguous_reserve() 621 * 622 * At this stage the bootmem allocator is ready to use. 623 * 624 * NOTE: historically plat_mem_setup did the entire platform initialization. 625 * This was rather impractical because it meant plat_mem_setup had to 626 * get away without any kind of memory allocator. To keep old code from 627 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 628 * initialization hook for anything else was introduced. 629 */ 630 static void __init arch_mem_init(char **cmdline_p) 631 { 632 /* call board setup routine */ 633 plat_mem_setup(); 634 memblock_set_bottom_up(true); 635 636 bootcmdline_init(); 637 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 638 *cmdline_p = command_line; 639 640 parse_early_param(); 641 642 if (usermem) 643 pr_info("User-defined physical RAM map overwrite\n"); 644 645 check_kernel_sections_mem(); 646 647 early_init_fdt_reserve_self(); 648 early_init_fdt_scan_reserved_mem(); 649 650 #ifndef CONFIG_NUMA 651 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); 652 #endif 653 bootmem_init(); 654 655 /* 656 * Prevent memblock from allocating high memory. 657 * This cannot be done before max_low_pfn is detected, so up 658 * to this point is possible to only reserve physical memory 659 * with memblock_reserve; memblock_alloc* can be used 660 * only after this point 661 */ 662 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 663 664 mips_reserve_vmcore(); 665 666 mips_parse_crashkernel(); 667 device_tree_init(); 668 669 /* 670 * In order to reduce the possibility of kernel panic when failed to 671 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 672 * low memory as small as possible before plat_swiotlb_setup(), so 673 * make sparse_init() using top-down allocation. 674 */ 675 memblock_set_bottom_up(false); 676 sparse_init(); 677 memblock_set_bottom_up(true); 678 679 plat_swiotlb_setup(); 680 681 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 682 683 /* Reserve for hibernation. */ 684 memblock_reserve(__pa_symbol(&__nosave_begin), 685 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); 686 687 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 688 } 689 690 static void __init resource_init(void) 691 { 692 phys_addr_t start, end; 693 u64 i; 694 695 if (UNCAC_BASE != IO_BASE) 696 return; 697 698 code_resource.start = __pa_symbol(&_text); 699 code_resource.end = __pa_symbol(&_etext) - 1; 700 data_resource.start = __pa_symbol(&_etext); 701 data_resource.end = __pa_symbol(&_edata) - 1; 702 bss_resource.start = __pa_symbol(&__bss_start); 703 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 704 705 for_each_mem_range(i, &start, &end) { 706 struct resource *res; 707 708 res = memblock_alloc_or_panic(sizeof(struct resource), SMP_CACHE_BYTES); 709 710 res->start = start; 711 /* 712 * In memblock, end points to the first byte after the 713 * range while in resourses, end points to the last byte in 714 * the range. 715 */ 716 res->end = end - 1; 717 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 718 res->name = "System RAM"; 719 720 request_resource(&iomem_resource, res); 721 722 /* 723 * We don't know which RAM region contains kernel data, 724 * so we try it repeatedly and let the resource manager 725 * test it. 726 */ 727 request_resource(res, &code_resource); 728 request_resource(res, &data_resource); 729 request_resource(res, &bss_resource); 730 request_crashkernel(res); 731 } 732 } 733 734 #ifdef CONFIG_SMP 735 static void __init prefill_possible_map(void) 736 { 737 int i, possible = num_possible_cpus(); 738 739 if (possible > nr_cpu_ids) 740 possible = nr_cpu_ids; 741 742 for (i = 0; i < possible; i++) 743 set_cpu_possible(i, true); 744 for (; i < NR_CPUS; i++) 745 set_cpu_possible(i, false); 746 747 set_nr_cpu_ids(possible); 748 } 749 #else 750 static inline void prefill_possible_map(void) {} 751 #endif 752 753 static void __init setup_rng_seed(void) 754 { 755 char *rng_seed_hex = fw_getenv("rngseed"); 756 u8 rng_seed[512]; 757 size_t len; 758 759 if (!rng_seed_hex) 760 return; 761 762 len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2); 763 if (hex2bin(rng_seed, rng_seed_hex, len)) 764 return; 765 766 add_bootloader_randomness(rng_seed, len); 767 memzero_explicit(rng_seed, len); 768 memzero_explicit(rng_seed_hex, len * 2); 769 } 770 771 void __init setup_arch(char **cmdline_p) 772 { 773 cpu_probe(); 774 mips_cm_probe(); 775 prom_init(); 776 777 setup_early_fdc_console(); 778 #ifdef CONFIG_EARLY_PRINTK 779 setup_early_printk(); 780 #endif 781 cpu_report(); 782 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64)) 783 check_bugs64_early(); 784 785 arch_mem_init(cmdline_p); 786 dmi_setup(); 787 788 resource_init(); 789 plat_smp_setup(); 790 prefill_possible_map(); 791 792 cpu_cache_init(); 793 paging_init(); 794 795 memblock_dump_all(); 796 797 setup_rng_seed(); 798 } 799 800 unsigned long kernelsp[NR_CPUS]; 801 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 802 803 #ifdef CONFIG_DEBUG_FS 804 struct dentry *mips_debugfs_dir; 805 static int __init debugfs_mips(void) 806 { 807 mips_debugfs_dir = debugfs_create_dir("mips", NULL); 808 return 0; 809 } 810 arch_initcall(debugfs_mips); 811 #endif 812 813 #ifdef CONFIG_DMA_NONCOHERENT 814 static int __init setcoherentio(char *str) 815 { 816 dma_default_coherent = true; 817 pr_info("Hardware DMA cache coherency (command line)\n"); 818 return 0; 819 } 820 early_param("coherentio", setcoherentio); 821 822 static int __init setnocoherentio(char *str) 823 { 824 dma_default_coherent = false; 825 pr_info("Software DMA cache coherency (command line)\n"); 826 return 0; 827 } 828 early_param("nocoherentio", setnocoherentio); 829 #endif 830 831 void __init arch_cpu_finalize_init(void) 832 { 833 unsigned int cpu = smp_processor_id(); 834 835 cpu_data[cpu].udelay_val = loops_per_jiffy; 836 check_bugs32(); 837 838 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64)) 839 check_bugs64(); 840 } 841