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/ioport.h> 17 #include <linux/export.h> 18 #include <linux/memblock.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-map-ops.h> 29 #include <linux/decompress/generic.h> 30 #include <linux/of_fdt.h> 31 #include <linux/dmi.h> 32 #include <linux/crash_dump.h> 33 34 #include <asm/addrspace.h> 35 #include <asm/bootinfo.h> 36 #include <asm/bugs.h> 37 #include <asm/cache.h> 38 #include <asm/cdmm.h> 39 #include <asm/cpu.h> 40 #include <asm/debug.h> 41 #include <asm/mmzone.h> 42 #include <asm/sections.h> 43 #include <asm/setup.h> 44 #include <asm/smp-ops.h> 45 #include <asm/mips-cps.h> 46 #include <asm/prom.h> 47 #include <asm/fw/fw.h> 48 49 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB 50 char __section(".appended_dtb") __appended_dtb[0x100000]; 51 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */ 52 53 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly; 54 55 EXPORT_SYMBOL(cpu_data); 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 * perform 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 } 159 160 /* 161 * Sanitize initrd addresses. For example firmware 162 * can't guess if they need to pass them through 163 * 64-bits values if the kernel has been built in pure 164 * 32-bit. We need also to switch from KSEG0 to XKPHYS 165 * addresses now, so the code can now safely use __pa(). 166 */ 167 end = __pa(initrd_end); 168 initrd_end = (unsigned long)__va(end); 169 initrd_start = (unsigned long)__va(__pa(initrd_start)); 170 171 if (initrd_start < PAGE_OFFSET) { 172 pr_err("initrd start < PAGE_OFFSET\n"); 173 goto disable; 174 } 175 176 ROOT_DEV = Root_RAM0; 177 return PFN_UP(end); 178 disable: 179 initrd_start = 0; 180 initrd_end = 0; 181 return 0; 182 } 183 184 /* In some conditions (e.g. big endian bootloader with a little endian 185 kernel), the initrd might appear byte swapped. Try to detect this and 186 byte swap it if needed. */ 187 static void __init maybe_bswap_initrd(void) 188 { 189 #if defined(CONFIG_CPU_CAVIUM_OCTEON) 190 u64 buf; 191 192 /* Check for CPIO signature */ 193 if (!memcmp((void *)initrd_start, "070701", 6)) 194 return; 195 196 /* Check for compressed initrd */ 197 if (decompress_method((unsigned char *)initrd_start, 8, NULL)) 198 return; 199 200 /* Try again with a byte swapped header */ 201 buf = swab64p((u64 *)initrd_start); 202 if (!memcmp(&buf, "070701", 6) || 203 decompress_method((unsigned char *)(&buf), 8, NULL)) { 204 unsigned long i; 205 206 pr_info("Byteswapped initrd detected\n"); 207 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8) 208 swab64s((u64 *)i); 209 } 210 #endif 211 } 212 213 static void __init finalize_initrd(void) 214 { 215 unsigned long size = initrd_end - initrd_start; 216 217 if (size == 0) { 218 printk(KERN_INFO "Initrd not found or empty"); 219 goto disable; 220 } 221 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) { 222 printk(KERN_ERR "Initrd extends beyond end of memory"); 223 goto disable; 224 } 225 226 maybe_bswap_initrd(); 227 228 memblock_reserve(__pa(initrd_start), size); 229 initrd_below_start_ok = 1; 230 231 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n", 232 initrd_start, size); 233 return; 234 disable: 235 printk(KERN_CONT " - disabling initrd\n"); 236 initrd_start = 0; 237 initrd_end = 0; 238 } 239 240 #else /* !CONFIG_BLK_DEV_INITRD */ 241 242 static unsigned long __init init_initrd(void) 243 { 244 return 0; 245 } 246 247 #define finalize_initrd() do {} while (0) 248 249 #endif 250 251 /* 252 * Initialize the bootmem allocator. It also setup initrd related data 253 * if needed. 254 */ 255 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA)) 256 257 static void __init bootmem_init(void) 258 { 259 init_initrd(); 260 finalize_initrd(); 261 } 262 263 #else /* !CONFIG_SGI_IP27 */ 264 265 static void __init bootmem_init(void) 266 { 267 phys_addr_t ramstart, ramend; 268 unsigned long start, end; 269 int i; 270 271 ramstart = memblock_start_of_DRAM(); 272 ramend = memblock_end_of_DRAM(); 273 274 /* 275 * Sanity check any INITRD first. We don't take it into account 276 * for bootmem setup initially, rely on the end-of-kernel-code 277 * as our memory range starting point. Once bootmem is inited we 278 * will reserve the area used for the initrd. 279 */ 280 init_initrd(); 281 282 /* Reserve memory occupied by kernel. */ 283 memblock_reserve(__pa_symbol(&_text), 284 __pa_symbol(&_end) - __pa_symbol(&_text)); 285 286 /* max_low_pfn is not a number of pages but the end pfn of low mem */ 287 288 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET 289 ARCH_PFN_OFFSET = PFN_UP(ramstart); 290 #else 291 /* 292 * Reserve any memory between the start of RAM and PHYS_OFFSET 293 */ 294 if (ramstart > PHYS_OFFSET) 295 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET); 296 297 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) { 298 pr_info("Wasting %lu bytes for tracking %lu unused pages\n", 299 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)), 300 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET)); 301 } 302 #endif 303 304 min_low_pfn = ARCH_PFN_OFFSET; 305 max_pfn = PFN_DOWN(ramend); 306 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) { 307 /* 308 * Skip highmem here so we get an accurate max_low_pfn if low 309 * memory stops short of high memory. 310 * If the region overlaps HIGHMEM_START, end is clipped so 311 * max_pfn excludes the highmem portion. 312 */ 313 if (start >= PFN_DOWN(HIGHMEM_START)) 314 continue; 315 if (end > PFN_DOWN(HIGHMEM_START)) 316 end = PFN_DOWN(HIGHMEM_START); 317 if (end > max_low_pfn) 318 max_low_pfn = end; 319 } 320 321 if (min_low_pfn >= max_low_pfn) 322 panic("Incorrect memory mapping !!!"); 323 324 if (max_pfn > PFN_DOWN(HIGHMEM_START)) { 325 max_low_pfn = PFN_DOWN(HIGHMEM_START); 326 #ifdef CONFIG_HIGHMEM 327 highstart_pfn = max_low_pfn; 328 highend_pfn = max_pfn; 329 #else 330 max_pfn = max_low_pfn; 331 #endif 332 } 333 334 /* 335 * Reserve initrd memory if needed. 336 */ 337 finalize_initrd(); 338 } 339 340 #endif /* CONFIG_SGI_IP27 */ 341 342 static int usermem __initdata; 343 344 static int __init early_parse_mem(char *p) 345 { 346 phys_addr_t start, size; 347 348 if (!p) { 349 pr_err("mem parameter is empty, do nothing\n"); 350 return -EINVAL; 351 } 352 353 /* 354 * If a user specifies memory size, we 355 * blow away any automatically generated 356 * size. 357 */ 358 if (usermem == 0) { 359 usermem = 1; 360 memblock_remove(memblock_start_of_DRAM(), 361 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 362 } 363 start = 0; 364 size = memparse(p, &p); 365 if (*p == '@') 366 start = memparse(p + 1, &p); 367 368 if (IS_ENABLED(CONFIG_NUMA)) 369 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE); 370 else 371 memblock_add(start, size); 372 373 return 0; 374 } 375 early_param("mem", early_parse_mem); 376 377 static int __init early_parse_memmap(char *p) 378 { 379 char *oldp; 380 u64 start_at, mem_size; 381 382 if (!p) 383 return -EINVAL; 384 385 if (!strncmp(p, "exactmap", 8)) { 386 pr_err("\"memmap=exactmap\" invalid on MIPS\n"); 387 return 0; 388 } 389 390 oldp = p; 391 mem_size = memparse(p, &p); 392 if (p == oldp) 393 return -EINVAL; 394 395 if (*p == '@') { 396 start_at = memparse(p+1, &p); 397 memblock_add(start_at, mem_size); 398 } else if (*p == '#') { 399 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n"); 400 return -EINVAL; 401 } else if (*p == '$') { 402 start_at = memparse(p+1, &p); 403 memblock_add(start_at, mem_size); 404 memblock_reserve(start_at, mem_size); 405 } else { 406 pr_err("\"memmap\" invalid format!\n"); 407 return -EINVAL; 408 } 409 410 if (*p == '\0') { 411 usermem = 1; 412 return 0; 413 } else 414 return -EINVAL; 415 } 416 early_param("memmap", early_parse_memmap); 417 418 static void __init mips_reserve_vmcore(void) 419 { 420 #ifdef CONFIG_PROC_VMCORE 421 phys_addr_t start, end; 422 u64 i; 423 424 if (!elfcorehdr_size) { 425 for_each_mem_range(i, &start, &end) { 426 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) { 427 /* 428 * Reserve from the elf core header to the end of 429 * the memory segment, that should all be kdump 430 * reserved memory. 431 */ 432 elfcorehdr_size = end - elfcorehdr_addr; 433 break; 434 } 435 } 436 } 437 438 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n", 439 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10); 440 441 memblock_reserve(elfcorehdr_addr, elfcorehdr_size); 442 #endif 443 } 444 445 /* 64M alignment for crash kernel regions */ 446 #define CRASH_ALIGN SZ_64M 447 #define CRASH_ADDR_MAX SZ_512M 448 449 static void __init mips_parse_crashkernel(void) 450 { 451 unsigned long long total_mem; 452 unsigned long long crash_size, crash_base; 453 int ret; 454 455 if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) 456 return; 457 458 total_mem = memblock_phys_mem_size(); 459 ret = parse_crashkernel(boot_command_line, total_mem, 460 &crash_size, &crash_base, 461 NULL, NULL); 462 if (ret != 0 || crash_size <= 0) 463 return; 464 465 if (crash_base <= 0) { 466 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN, 467 CRASH_ALIGN, 468 CRASH_ADDR_MAX); 469 if (!crash_base) { 470 pr_warn("crashkernel reservation failed - No suitable area found.\n"); 471 return; 472 } 473 } else { 474 unsigned long long start; 475 476 start = memblock_phys_alloc_range(crash_size, 1, 477 crash_base, 478 crash_base + crash_size); 479 if (start != crash_base) { 480 pr_warn("Invalid memory region reserved for crash kernel\n"); 481 return; 482 } 483 } 484 485 crashk_res.start = crash_base; 486 crashk_res.end = crash_base + crash_size - 1; 487 } 488 489 static void __init request_crashkernel(struct resource *res) 490 { 491 int ret; 492 493 if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) 494 return; 495 496 if (crashk_res.start == crashk_res.end) 497 return; 498 499 ret = request_resource(res, &crashk_res); 500 if (!ret) 501 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n", 502 (unsigned long)(resource_size(&crashk_res) >> 20), 503 (unsigned long)(crashk_res.start >> 20)); 504 } 505 506 static void __init check_kernel_sections_mem(void) 507 { 508 phys_addr_t start = __pa_symbol(&_text); 509 phys_addr_t size = __pa_symbol(&_end) - start; 510 511 if (!memblock_is_region_memory(start, size)) { 512 pr_info("Kernel sections are not in the memory maps\n"); 513 memblock_add(start, size); 514 } 515 } 516 517 static void __init bootcmdline_append(const char *s, size_t max) 518 { 519 if (!s[0] || !max) 520 return; 521 522 if (boot_command_line[0]) 523 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE); 524 525 strlcat(boot_command_line, s, max); 526 } 527 528 #ifdef CONFIG_OF_EARLY_FLATTREE 529 530 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname, 531 int depth, void *data) 532 { 533 bool *dt_bootargs = data; 534 const char *p; 535 int l; 536 537 if (depth != 1 || !data || 538 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0)) 539 return 0; 540 541 p = of_get_flat_dt_prop(node, "bootargs", &l); 542 if (p != NULL && l > 0) { 543 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE)); 544 *dt_bootargs = true; 545 } 546 547 return 1; 548 } 549 550 #endif /* CONFIG_OF_EARLY_FLATTREE */ 551 552 static void __init bootcmdline_init(void) 553 { 554 bool dt_bootargs = false; 555 556 /* 557 * If CMDLINE_OVERRIDE is enabled then initializing the command line is 558 * trivial - we simply use the built-in command line unconditionally & 559 * unmodified. 560 */ 561 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) { 562 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 563 return; 564 } 565 566 /* 567 * If the user specified a built-in command line & 568 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is 569 * prepended to arguments from the bootloader or DT so we'll copy them 570 * to the start of boot_command_line here. Otherwise, empty 571 * boot_command_line to undo anything early_init_dt_scan_chosen() did. 572 */ 573 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 574 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE); 575 else 576 boot_command_line[0] = 0; 577 578 #ifdef CONFIG_OF_EARLY_FLATTREE 579 /* 580 * If we're configured to take boot arguments from DT, look for those 581 * now. 582 */ 583 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) || 584 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)) 585 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs); 586 #endif 587 588 /* 589 * If we didn't get any arguments from DT (regardless of whether that's 590 * because we weren't configured to look for them, or because we looked 591 * & found none) then we'll take arguments from the bootloader. 592 * plat_mem_setup() should have filled arcs_cmdline with arguments from 593 * the bootloader. 594 */ 595 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs) 596 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE); 597 598 /* 599 * If the user specified a built-in command line & we didn't already 600 * prepend it, we append it to boot_command_line here. 601 */ 602 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) && 603 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)) 604 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE); 605 } 606 607 /* 608 * arch_mem_init - initialize memory management subsystem 609 * 610 * o plat_mem_setup() detects the memory configuration and will record detected 611 * memory areas using memblock_add. 612 * 613 * At this stage the memory configuration of the system is known to the 614 * kernel but generic memory management system is still entirely uninitialized. 615 * 616 * o bootmem_init() 617 * o sparse_init() 618 * o paging_init() 619 * o dma_contiguous_reserve() 620 * 621 * At this stage the bootmem allocator is ready to use. 622 * 623 * NOTE: historically plat_mem_setup did the entire platform initialization. 624 * This was rather impractical because it meant plat_mem_setup had to 625 * get away without any kind of memory allocator. To keep old code from 626 * breaking plat_setup was just renamed to plat_mem_setup and a second platform 627 * initialization hook for anything else was introduced. 628 */ 629 static void __init arch_mem_init(char **cmdline_p) 630 { 631 /* call board setup routine */ 632 plat_mem_setup(); 633 memblock_set_bottom_up(true); 634 635 bootcmdline_init(); 636 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE); 637 *cmdline_p = command_line; 638 639 parse_early_param(); 640 641 if (usermem) 642 pr_info("User-defined physical RAM map overwrite\n"); 643 644 check_kernel_sections_mem(); 645 646 early_init_fdt_reserve_self(); 647 early_init_fdt_scan_reserved_mem(); 648 649 #ifndef CONFIG_NUMA 650 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0); 651 #endif 652 bootmem_init(); 653 654 /* 655 * Prevent memblock from allocating high memory. 656 * This cannot be done before max_low_pfn is detected, so up 657 * to this point is possible to only reserve physical memory 658 * with memblock_reserve; memblock_alloc* can be used 659 * only after this point 660 */ 661 memblock_set_current_limit(PFN_PHYS(max_low_pfn)); 662 663 mips_reserve_vmcore(); 664 665 mips_parse_crashkernel(); 666 device_tree_init(); 667 668 /* 669 * In order to reduce the possibility of kernel panic when failed to 670 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate 671 * low memory as small as possible before plat_swiotlb_setup(), so 672 * make sparse_init() using top-down allocation. 673 */ 674 memblock_set_bottom_up(false); 675 sparse_init(); 676 memblock_set_bottom_up(true); 677 678 plat_swiotlb_setup(); 679 680 dma_contiguous_reserve(PFN_PHYS(max_low_pfn)); 681 682 /* Reserve for hibernation. */ 683 memblock_reserve(__pa_symbol(&__nosave_begin), 684 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin)); 685 686 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn)); 687 } 688 689 static void __init resource_init(void) 690 { 691 phys_addr_t start, end; 692 u64 i; 693 694 if (UNCAC_BASE != IO_BASE) 695 return; 696 697 code_resource.start = __pa_symbol(&_text); 698 code_resource.end = __pa_symbol(&_etext) - 1; 699 data_resource.start = __pa_symbol(&_etext); 700 data_resource.end = __pa_symbol(&_edata) - 1; 701 bss_resource.start = __pa_symbol(&__bss_start); 702 bss_resource.end = __pa_symbol(&__bss_stop) - 1; 703 704 for_each_mem_range(i, &start, &end) { 705 struct resource *res; 706 707 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 708 if (!res) 709 panic("%s: Failed to allocate %zu bytes\n", __func__, 710 sizeof(struct resource)); 711 712 res->start = start; 713 /* 714 * In memblock, end points to the first byte after the 715 * range while in resourses, end points to the last byte in 716 * the range. 717 */ 718 res->end = end - 1; 719 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 720 res->name = "System RAM"; 721 722 request_resource(&iomem_resource, res); 723 724 /* 725 * We don't know which RAM region contains kernel data, 726 * so we try it repeatedly and let the resource manager 727 * test it. 728 */ 729 request_resource(res, &code_resource); 730 request_resource(res, &data_resource); 731 request_resource(res, &bss_resource); 732 request_crashkernel(res); 733 } 734 } 735 736 #ifdef CONFIG_SMP 737 static void __init prefill_possible_map(void) 738 { 739 int i, possible = num_possible_cpus(); 740 741 if (possible > nr_cpu_ids) 742 possible = nr_cpu_ids; 743 744 for (i = 0; i < possible; i++) 745 set_cpu_possible(i, true); 746 for (; i < NR_CPUS; i++) 747 set_cpu_possible(i, false); 748 749 set_nr_cpu_ids(possible); 750 } 751 #else 752 static inline void prefill_possible_map(void) {} 753 #endif 754 755 static void __init setup_rng_seed(void) 756 { 757 char *rng_seed_hex = fw_getenv("rngseed"); 758 u8 rng_seed[512]; 759 size_t len; 760 761 if (!rng_seed_hex) 762 return; 763 764 len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2); 765 if (hex2bin(rng_seed, rng_seed_hex, len)) 766 return; 767 768 add_bootloader_randomness(rng_seed, len); 769 memzero_explicit(rng_seed, len); 770 memzero_explicit(rng_seed_hex, len * 2); 771 } 772 773 void __init setup_arch(char **cmdline_p) 774 { 775 cpu_probe(); 776 mips_cm_probe(); 777 prom_init(); 778 779 setup_early_fdc_console(); 780 #ifdef CONFIG_EARLY_PRINTK 781 setup_early_printk(); 782 #endif 783 cpu_report(); 784 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64)) 785 check_bugs64_early(); 786 787 arch_mem_init(cmdline_p); 788 dmi_setup(); 789 790 resource_init(); 791 plat_smp_setup(); 792 prefill_possible_map(); 793 794 cpu_cache_init(); 795 paging_init(); 796 797 memblock_dump_all(); 798 799 setup_rng_seed(); 800 } 801 802 unsigned long kernelsp[NR_CPUS]; 803 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3; 804 805 #ifdef CONFIG_DEBUG_FS 806 struct dentry *mips_debugfs_dir; 807 static int __init debugfs_mips(void) 808 { 809 mips_debugfs_dir = debugfs_create_dir("mips", NULL); 810 return 0; 811 } 812 arch_initcall(debugfs_mips); 813 #endif 814 815 #ifdef CONFIG_DMA_NONCOHERENT 816 static int __init setcoherentio(char *str) 817 { 818 dma_default_coherent = true; 819 pr_info("Hardware DMA cache coherency (command line)\n"); 820 return 0; 821 } 822 early_param("coherentio", setcoherentio); 823 824 static int __init setnocoherentio(char *str) 825 { 826 dma_default_coherent = false; 827 pr_info("Software DMA cache coherency (command line)\n"); 828 return 0; 829 } 830 early_param("nocoherentio", setnocoherentio); 831 #endif 832 833 void __init arch_cpu_finalize_init(void) 834 { 835 unsigned int cpu = smp_processor_id(); 836 837 cpu_data[cpu].udelay_val = loops_per_jiffy; 838 check_bugs32(); 839 840 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64)) 841 check_bugs64(); 842 } 843