1 // SPDX-License-Identifier: GPL-2.0 !! 1 /*
2 #ifdef CONFIG_MMU !! 2 * This file is subject to the terms and conditions of the GNU General Public
3 #include "setup_mm.c" !! 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/bootmem.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-contiguous.h>
>> 29 #include <linux/decompress/generic.h>
>> 30 #include <linux/of_fdt.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/sections.h>
>> 40 #include <asm/setup.h>
>> 41 #include <asm/smp-ops.h>
>> 42 #include <asm/prom.h>
>> 43
>> 44 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
>> 45 const char __section(.appended_dtb) __appended_dtb[0x100000];
>> 46 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
>> 47
>> 48 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
>> 49
>> 50 EXPORT_SYMBOL(cpu_data);
>> 51
>> 52 #ifdef CONFIG_VT
>> 53 struct screen_info screen_info;
>> 54 #endif
>> 55
>> 56 /*
>> 57 * Setup information
>> 58 *
>> 59 * These are initialized so they are in the .data section
>> 60 */
>> 61 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
>> 62
>> 63 EXPORT_SYMBOL(mips_machtype);
>> 64
>> 65 struct boot_mem_map boot_mem_map;
>> 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 char __initdata builtin_cmdline[COMMAND_LINE_SIZE] = CONFIG_CMDLINE;
>> 72 #endif
>> 73
>> 74 /*
>> 75 * mips_io_port_base is the begin of the address space to which x86 style
>> 76 * I/O ports are mapped.
>> 77 */
>> 78 const unsigned long mips_io_port_base = -1;
>> 79 EXPORT_SYMBOL(mips_io_port_base);
>> 80
>> 81 static struct resource code_resource = { .name = "Kernel code", };
>> 82 static struct resource data_resource = { .name = "Kernel data", };
>> 83 static struct resource bss_resource = { .name = "Kernel bss", };
>> 84
>> 85 static void *detect_magic __initdata = detect_memory_region;
>> 86
>> 87 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
>> 88 {
>> 89 int x = boot_mem_map.nr_map;
>> 90 int i;
>> 91
>> 92 /*
>> 93 * If the region reaches the top of the physical address space, adjust
>> 94 * the size slightly so that (start + size) doesn't overflow
>> 95 */
>> 96 if (start + size - 1 == (phys_addr_t)ULLONG_MAX)
>> 97 --size;
>> 98
>> 99 /* Sanity check */
>> 100 if (start + size < start) {
>> 101 pr_warn("Trying to add an invalid memory region, skipped\n");
>> 102 return;
>> 103 }
>> 104
>> 105 /*
>> 106 * Try to merge with existing entry, if any.
>> 107 */
>> 108 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 109 struct boot_mem_map_entry *entry = boot_mem_map.map + i;
>> 110 unsigned long top;
>> 111
>> 112 if (entry->type != type)
>> 113 continue;
>> 114
>> 115 if (start + size < entry->addr)
>> 116 continue; /* no overlap */
>> 117
>> 118 if (entry->addr + entry->size < start)
>> 119 continue; /* no overlap */
>> 120
>> 121 top = max(entry->addr + entry->size, start + size);
>> 122 entry->addr = min(entry->addr, start);
>> 123 entry->size = top - entry->addr;
>> 124
>> 125 return;
>> 126 }
>> 127
>> 128 if (boot_mem_map.nr_map == BOOT_MEM_MAP_MAX) {
>> 129 pr_err("Ooops! Too many entries in the memory map!\n");
>> 130 return;
>> 131 }
>> 132
>> 133 boot_mem_map.map[x].addr = start;
>> 134 boot_mem_map.map[x].size = size;
>> 135 boot_mem_map.map[x].type = type;
>> 136 boot_mem_map.nr_map++;
>> 137 }
>> 138
>> 139 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
>> 140 {
>> 141 void *dm = &detect_magic;
>> 142 phys_addr_t size;
>> 143
>> 144 for (size = sz_min; size < sz_max; size <<= 1) {
>> 145 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
>> 146 break;
>> 147 }
>> 148
>> 149 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
>> 150 ((unsigned long long) size) / SZ_1M,
>> 151 (unsigned long long) start,
>> 152 ((unsigned long long) sz_min) / SZ_1M,
>> 153 ((unsigned long long) sz_max) / SZ_1M);
>> 154
>> 155 add_memory_region(start, size, BOOT_MEM_RAM);
>> 156 }
>> 157
>> 158 bool __init memory_region_available(phys_addr_t start, phys_addr_t size)
>> 159 {
>> 160 int i;
>> 161 bool in_ram = false, free = true;
>> 162
>> 163 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 164 phys_addr_t start_, end_;
>> 165
>> 166 start_ = boot_mem_map.map[i].addr;
>> 167 end_ = boot_mem_map.map[i].addr + boot_mem_map.map[i].size;
>> 168
>> 169 switch (boot_mem_map.map[i].type) {
>> 170 case BOOT_MEM_RAM:
>> 171 if (start >= start_ && start + size <= end_)
>> 172 in_ram = true;
>> 173 break;
>> 174 case BOOT_MEM_RESERVED:
>> 175 if ((start >= start_ && start < end_) ||
>> 176 (start < start_ && start + size >= start_))
>> 177 free = false;
>> 178 break;
>> 179 default:
>> 180 continue;
>> 181 }
>> 182 }
>> 183
>> 184 return in_ram && free;
>> 185 }
>> 186
>> 187 static void __init print_memory_map(void)
>> 188 {
>> 189 int i;
>> 190 const int field = 2 * sizeof(unsigned long);
>> 191
>> 192 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 193 printk(KERN_INFO " memory: %0*Lx @ %0*Lx ",
>> 194 field, (unsigned long long) boot_mem_map.map[i].size,
>> 195 field, (unsigned long long) boot_mem_map.map[i].addr);
>> 196
>> 197 switch (boot_mem_map.map[i].type) {
>> 198 case BOOT_MEM_RAM:
>> 199 printk(KERN_CONT "(usable)\n");
>> 200 break;
>> 201 case BOOT_MEM_INIT_RAM:
>> 202 printk(KERN_CONT "(usable after init)\n");
>> 203 break;
>> 204 case BOOT_MEM_ROM_DATA:
>> 205 printk(KERN_CONT "(ROM data)\n");
>> 206 break;
>> 207 case BOOT_MEM_RESERVED:
>> 208 printk(KERN_CONT "(reserved)\n");
>> 209 break;
>> 210 default:
>> 211 printk(KERN_CONT "type %lu\n", boot_mem_map.map[i].type);
>> 212 break;
>> 213 }
>> 214 }
>> 215 }
>> 216
>> 217 /*
>> 218 * Manage initrd
>> 219 */
>> 220 #ifdef CONFIG_BLK_DEV_INITRD
>> 221
>> 222 static int __init rd_start_early(char *p)
>> 223 {
>> 224 unsigned long start = memparse(p, &p);
>> 225
>> 226 #ifdef CONFIG_64BIT
>> 227 /* Guess if the sign extension was forgotten by bootloader */
>> 228 if (start < XKPHYS)
>> 229 start = (int)start;
>> 230 #endif
>> 231 initrd_start = start;
>> 232 initrd_end += start;
>> 233 return 0;
>> 234 }
>> 235 early_param("rd_start", rd_start_early);
>> 236
>> 237 static int __init rd_size_early(char *p)
>> 238 {
>> 239 initrd_end += memparse(p, &p);
>> 240 return 0;
>> 241 }
>> 242 early_param("rd_size", rd_size_early);
>> 243
>> 244 /* it returns the next free pfn after initrd */
>> 245 static unsigned long __init init_initrd(void)
>> 246 {
>> 247 unsigned long end;
>> 248
>> 249 /*
>> 250 * Board specific code or command line parser should have
>> 251 * already set up initrd_start and initrd_end. In these cases
>> 252 * perfom sanity checks and use them if all looks good.
>> 253 */
>> 254 if (!initrd_start || initrd_end <= initrd_start)
>> 255 goto disable;
>> 256
>> 257 if (initrd_start & ~PAGE_MASK) {
>> 258 pr_err("initrd start must be page aligned\n");
>> 259 goto disable;
>> 260 }
>> 261 if (initrd_start < PAGE_OFFSET) {
>> 262 pr_err("initrd start < PAGE_OFFSET\n");
>> 263 goto disable;
>> 264 }
>> 265
>> 266 /*
>> 267 * Sanitize initrd addresses. For example firmware
>> 268 * can't guess if they need to pass them through
>> 269 * 64-bits values if the kernel has been built in pure
>> 270 * 32-bit. We need also to switch from KSEG0 to XKPHYS
>> 271 * addresses now, so the code can now safely use __pa().
>> 272 */
>> 273 end = __pa(initrd_end);
>> 274 initrd_end = (unsigned long)__va(end);
>> 275 initrd_start = (unsigned long)__va(__pa(initrd_start));
>> 276
>> 277 ROOT_DEV = Root_RAM0;
>> 278 return PFN_UP(end);
>> 279 disable:
>> 280 initrd_start = 0;
>> 281 initrd_end = 0;
>> 282 return 0;
>> 283 }
>> 284
>> 285 /* In some conditions (e.g. big endian bootloader with a little endian
>> 286 kernel), the initrd might appear byte swapped. Try to detect this and
>> 287 byte swap it if needed. */
>> 288 static void __init maybe_bswap_initrd(void)
>> 289 {
>> 290 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
>> 291 u64 buf;
>> 292
>> 293 /* Check for CPIO signature */
>> 294 if (!memcmp((void *)initrd_start, "070701", 6))
>> 295 return;
>> 296
>> 297 /* Check for compressed initrd */
>> 298 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
>> 299 return;
>> 300
>> 301 /* Try again with a byte swapped header */
>> 302 buf = swab64p((u64 *)initrd_start);
>> 303 if (!memcmp(&buf, "070701", 6) ||
>> 304 decompress_method((unsigned char *)(&buf), 8, NULL)) {
>> 305 unsigned long i;
>> 306
>> 307 pr_info("Byteswapped initrd detected\n");
>> 308 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
>> 309 swab64s((u64 *)i);
>> 310 }
>> 311 #endif
>> 312 }
>> 313
>> 314 static void __init finalize_initrd(void)
>> 315 {
>> 316 unsigned long size = initrd_end - initrd_start;
>> 317
>> 318 if (size == 0) {
>> 319 printk(KERN_INFO "Initrd not found or empty");
>> 320 goto disable;
>> 321 }
>> 322 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
>> 323 printk(KERN_ERR "Initrd extends beyond end of memory");
>> 324 goto disable;
>> 325 }
>> 326
>> 327 maybe_bswap_initrd();
>> 328
>> 329 reserve_bootmem(__pa(initrd_start), size, BOOTMEM_DEFAULT);
>> 330 initrd_below_start_ok = 1;
>> 331
>> 332 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
>> 333 initrd_start, size);
>> 334 return;
>> 335 disable:
>> 336 printk(KERN_CONT " - disabling initrd\n");
>> 337 initrd_start = 0;
>> 338 initrd_end = 0;
>> 339 }
>> 340
>> 341 #else /* !CONFIG_BLK_DEV_INITRD */
>> 342
>> 343 static unsigned long __init init_initrd(void)
>> 344 {
>> 345 return 0;
>> 346 }
>> 347
>> 348 #define finalize_initrd() do {} while (0)
>> 349
>> 350 #endif
>> 351
>> 352 /*
>> 353 * Initialize the bootmem allocator. It also setup initrd related data
>> 354 * if needed.
>> 355 */
>> 356 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON3) && defined(CONFIG_NUMA))
>> 357
>> 358 static void __init bootmem_init(void)
>> 359 {
>> 360 init_initrd();
>> 361 finalize_initrd();
>> 362 }
>> 363
>> 364 #else /* !CONFIG_SGI_IP27 */
>> 365
>> 366 static unsigned long __init bootmap_bytes(unsigned long pages)
>> 367 {
>> 368 unsigned long bytes = DIV_ROUND_UP(pages, 8);
>> 369
>> 370 return ALIGN(bytes, sizeof(long));
>> 371 }
>> 372
>> 373 static void __init bootmem_init(void)
>> 374 {
>> 375 unsigned long reserved_end;
>> 376 unsigned long mapstart = ~0UL;
>> 377 unsigned long bootmap_size;
>> 378 phys_addr_t ramstart = (phys_addr_t)ULLONG_MAX;
>> 379 bool bootmap_valid = false;
>> 380 int i;
>> 381
>> 382 /*
>> 383 * Sanity check any INITRD first. We don't take it into account
>> 384 * for bootmem setup initially, rely on the end-of-kernel-code
>> 385 * as our memory range starting point. Once bootmem is inited we
>> 386 * will reserve the area used for the initrd.
>> 387 */
>> 388 init_initrd();
>> 389 reserved_end = (unsigned long) PFN_UP(__pa_symbol(&_end));
>> 390
>> 391 /*
>> 392 * max_low_pfn is not a number of pages. The number of pages
>> 393 * of the system is given by 'max_low_pfn - min_low_pfn'.
>> 394 */
>> 395 min_low_pfn = ~0UL;
>> 396 max_low_pfn = 0;
>> 397
>> 398 /*
>> 399 * Find the highest page frame number we have available
>> 400 * and the lowest used RAM address
>> 401 */
>> 402 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 403 unsigned long start, end;
>> 404
>> 405 if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
>> 406 continue;
>> 407
>> 408 start = PFN_UP(boot_mem_map.map[i].addr);
>> 409 end = PFN_DOWN(boot_mem_map.map[i].addr
>> 410 + boot_mem_map.map[i].size);
>> 411
>> 412 ramstart = min(ramstart, boot_mem_map.map[i].addr);
>> 413
>> 414 #ifndef CONFIG_HIGHMEM
>> 415 /*
>> 416 * Skip highmem here so we get an accurate max_low_pfn if low
>> 417 * memory stops short of high memory.
>> 418 * If the region overlaps HIGHMEM_START, end is clipped so
>> 419 * max_pfn excludes the highmem portion.
>> 420 */
>> 421 if (start >= PFN_DOWN(HIGHMEM_START))
>> 422 continue;
>> 423 if (end > PFN_DOWN(HIGHMEM_START))
>> 424 end = PFN_DOWN(HIGHMEM_START);
>> 425 #endif
>> 426
>> 427 if (end > max_low_pfn)
>> 428 max_low_pfn = end;
>> 429 if (start < min_low_pfn)
>> 430 min_low_pfn = start;
>> 431 if (end <= reserved_end)
>> 432 continue;
>> 433 #ifdef CONFIG_BLK_DEV_INITRD
>> 434 /* Skip zones before initrd and initrd itself */
>> 435 if (initrd_end && end <= (unsigned long)PFN_UP(__pa(initrd_end)))
>> 436 continue;
>> 437 #endif
>> 438 if (start >= mapstart)
>> 439 continue;
>> 440 mapstart = max(reserved_end, start);
>> 441 }
>> 442
>> 443 /*
>> 444 * Reserve any memory between the start of RAM and PHYS_OFFSET
>> 445 */
>> 446 if (ramstart > PHYS_OFFSET)
>> 447 add_memory_region(PHYS_OFFSET, ramstart - PHYS_OFFSET,
>> 448 BOOT_MEM_RESERVED);
>> 449
>> 450 if (min_low_pfn >= max_low_pfn)
>> 451 panic("Incorrect memory mapping !!!");
>> 452 if (min_low_pfn > ARCH_PFN_OFFSET) {
>> 453 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
>> 454 (min_low_pfn - ARCH_PFN_OFFSET) * sizeof(struct page),
>> 455 min_low_pfn - ARCH_PFN_OFFSET);
>> 456 } else if (min_low_pfn < ARCH_PFN_OFFSET) {
>> 457 pr_info("%lu free pages won't be used\n",
>> 458 ARCH_PFN_OFFSET - min_low_pfn);
>> 459 }
>> 460 min_low_pfn = ARCH_PFN_OFFSET;
>> 461
>> 462 /*
>> 463 * Determine low and high memory ranges
>> 464 */
>> 465 max_pfn = max_low_pfn;
>> 466 if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
>> 467 #ifdef CONFIG_HIGHMEM
>> 468 highstart_pfn = PFN_DOWN(HIGHMEM_START);
>> 469 highend_pfn = max_low_pfn;
>> 470 #endif
>> 471 max_low_pfn = PFN_DOWN(HIGHMEM_START);
>> 472 }
>> 473
>> 474 #ifdef CONFIG_BLK_DEV_INITRD
>> 475 /*
>> 476 * mapstart should be after initrd_end
>> 477 */
>> 478 if (initrd_end)
>> 479 mapstart = max(mapstart, (unsigned long)PFN_UP(__pa(initrd_end)));
>> 480 #endif
>> 481
>> 482 /*
>> 483 * check that mapstart doesn't overlap with any of
>> 484 * memory regions that have been reserved through eg. DTB
>> 485 */
>> 486 bootmap_size = bootmap_bytes(max_low_pfn - min_low_pfn);
>> 487
>> 488 bootmap_valid = memory_region_available(PFN_PHYS(mapstart),
>> 489 bootmap_size);
>> 490 for (i = 0; i < boot_mem_map.nr_map && !bootmap_valid; i++) {
>> 491 unsigned long mapstart_addr;
>> 492
>> 493 switch (boot_mem_map.map[i].type) {
>> 494 case BOOT_MEM_RESERVED:
>> 495 mapstart_addr = PFN_ALIGN(boot_mem_map.map[i].addr +
>> 496 boot_mem_map.map[i].size);
>> 497 if (PHYS_PFN(mapstart_addr) < mapstart)
>> 498 break;
>> 499
>> 500 bootmap_valid = memory_region_available(mapstart_addr,
>> 501 bootmap_size);
>> 502 if (bootmap_valid)
>> 503 mapstart = PHYS_PFN(mapstart_addr);
>> 504 break;
>> 505 default:
>> 506 break;
>> 507 }
>> 508 }
>> 509
>> 510 if (!bootmap_valid)
>> 511 panic("No memory area to place a bootmap bitmap");
>> 512
>> 513 /*
>> 514 * Initialize the boot-time allocator with low memory only.
>> 515 */
>> 516 if (bootmap_size != init_bootmem_node(NODE_DATA(0), mapstart,
>> 517 min_low_pfn, max_low_pfn))
>> 518 panic("Unexpected memory size required for bootmap");
>> 519
>> 520 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 521 unsigned long start, end;
>> 522
>> 523 start = PFN_UP(boot_mem_map.map[i].addr);
>> 524 end = PFN_DOWN(boot_mem_map.map[i].addr
>> 525 + boot_mem_map.map[i].size);
>> 526
>> 527 if (start <= min_low_pfn)
>> 528 start = min_low_pfn;
>> 529 if (start >= end)
>> 530 continue;
>> 531
>> 532 #ifndef CONFIG_HIGHMEM
>> 533 if (end > max_low_pfn)
>> 534 end = max_low_pfn;
>> 535
>> 536 /*
>> 537 * ... finally, is the area going away?
>> 538 */
>> 539 if (end <= start)
>> 540 continue;
>> 541 #endif
>> 542
>> 543 memblock_add_node(PFN_PHYS(start), PFN_PHYS(end - start), 0);
>> 544 }
>> 545
>> 546 /*
>> 547 * Register fully available low RAM pages with the bootmem allocator.
>> 548 */
>> 549 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 550 unsigned long start, end, size;
>> 551
>> 552 start = PFN_UP(boot_mem_map.map[i].addr);
>> 553 end = PFN_DOWN(boot_mem_map.map[i].addr
>> 554 + boot_mem_map.map[i].size);
>> 555
>> 556 /*
>> 557 * Reserve usable memory.
>> 558 */
>> 559 switch (boot_mem_map.map[i].type) {
>> 560 case BOOT_MEM_RAM:
>> 561 break;
>> 562 case BOOT_MEM_INIT_RAM:
>> 563 memory_present(0, start, end);
>> 564 continue;
>> 565 default:
>> 566 /* Not usable memory */
>> 567 if (start > min_low_pfn && end < max_low_pfn)
>> 568 reserve_bootmem(boot_mem_map.map[i].addr,
>> 569 boot_mem_map.map[i].size,
>> 570 BOOTMEM_DEFAULT);
>> 571 continue;
>> 572 }
>> 573
>> 574 /*
>> 575 * We are rounding up the start address of usable memory
>> 576 * and at the end of the usable range downwards.
>> 577 */
>> 578 if (start >= max_low_pfn)
>> 579 continue;
>> 580 if (start < reserved_end)
>> 581 start = reserved_end;
>> 582 if (end > max_low_pfn)
>> 583 end = max_low_pfn;
>> 584
>> 585 /*
>> 586 * ... finally, is the area going away?
>> 587 */
>> 588 if (end <= start)
>> 589 continue;
>> 590 size = end - start;
>> 591
>> 592 /* Register lowmem ranges */
>> 593 free_bootmem(PFN_PHYS(start), size << PAGE_SHIFT);
>> 594 memory_present(0, start, end);
>> 595 }
>> 596
>> 597 /*
>> 598 * Reserve the bootmap memory.
>> 599 */
>> 600 reserve_bootmem(PFN_PHYS(mapstart), bootmap_size, BOOTMEM_DEFAULT);
>> 601
>> 602 #ifdef CONFIG_RELOCATABLE
>> 603 /*
>> 604 * The kernel reserves all memory below its _end symbol as bootmem,
>> 605 * but the kernel may now be at a much higher address. The memory
>> 606 * between the original and new locations may be returned to the system.
>> 607 */
>> 608 if (__pa_symbol(_text) > __pa_symbol(VMLINUX_LOAD_ADDRESS)) {
>> 609 unsigned long offset;
>> 610 extern void show_kernel_relocation(const char *level);
>> 611
>> 612 offset = __pa_symbol(_text) - __pa_symbol(VMLINUX_LOAD_ADDRESS);
>> 613 free_bootmem(__pa_symbol(VMLINUX_LOAD_ADDRESS), offset);
>> 614
>> 615 #if defined(CONFIG_DEBUG_KERNEL) && defined(CONFIG_DEBUG_INFO)
>> 616 /*
>> 617 * This information is necessary when debugging the kernel
>> 618 * But is a security vulnerability otherwise!
>> 619 */
>> 620 show_kernel_relocation(KERN_INFO);
>> 621 #endif
>> 622 }
>> 623 #endif
>> 624
>> 625 /*
>> 626 * Reserve initrd memory if needed.
>> 627 */
>> 628 finalize_initrd();
>> 629 }
>> 630
>> 631 #endif /* CONFIG_SGI_IP27 */
>> 632
>> 633 /*
>> 634 * arch_mem_init - initialize memory management subsystem
>> 635 *
>> 636 * o plat_mem_setup() detects the memory configuration and will record detected
>> 637 * memory areas using add_memory_region.
>> 638 *
>> 639 * At this stage the memory configuration of the system is known to the
>> 640 * kernel but generic memory management system is still entirely uninitialized.
>> 641 *
>> 642 * o bootmem_init()
>> 643 * o sparse_init()
>> 644 * o paging_init()
>> 645 * o dma_contiguous_reserve()
>> 646 *
>> 647 * At this stage the bootmem allocator is ready to use.
>> 648 *
>> 649 * NOTE: historically plat_mem_setup did the entire platform initialization.
>> 650 * This was rather impractical because it meant plat_mem_setup had to
>> 651 * get away without any kind of memory allocator. To keep old code from
>> 652 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
>> 653 * initialization hook for anything else was introduced.
>> 654 */
>> 655
>> 656 static int usermem __initdata;
>> 657
>> 658 static int __init early_parse_mem(char *p)
>> 659 {
>> 660 phys_addr_t start, size;
>> 661
>> 662 /*
>> 663 * If a user specifies memory size, we
>> 664 * blow away any automatically generated
>> 665 * size.
>> 666 */
>> 667 if (usermem == 0) {
>> 668 boot_mem_map.nr_map = 0;
>> 669 usermem = 1;
>> 670 }
>> 671 start = 0;
>> 672 size = memparse(p, &p);
>> 673 if (*p == '@')
>> 674 start = memparse(p + 1, &p);
>> 675
>> 676 add_memory_region(start, size, BOOT_MEM_RAM);
>> 677
>> 678 return 0;
>> 679 }
>> 680 early_param("mem", early_parse_mem);
>> 681
>> 682 static int __init early_parse_memmap(char *p)
>> 683 {
>> 684 char *oldp;
>> 685 u64 start_at, mem_size;
>> 686
>> 687 if (!p)
>> 688 return -EINVAL;
>> 689
>> 690 if (!strncmp(p, "exactmap", 8)) {
>> 691 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
>> 692 return 0;
>> 693 }
>> 694
>> 695 oldp = p;
>> 696 mem_size = memparse(p, &p);
>> 697 if (p == oldp)
>> 698 return -EINVAL;
>> 699
>> 700 if (*p == '@') {
>> 701 start_at = memparse(p+1, &p);
>> 702 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
>> 703 } else if (*p == '#') {
>> 704 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
>> 705 return -EINVAL;
>> 706 } else if (*p == '$') {
>> 707 start_at = memparse(p+1, &p);
>> 708 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
>> 709 } else {
>> 710 pr_err("\"memmap\" invalid format!\n");
>> 711 return -EINVAL;
>> 712 }
>> 713
>> 714 if (*p == '\0') {
>> 715 usermem = 1;
>> 716 return 0;
>> 717 } else
>> 718 return -EINVAL;
>> 719 }
>> 720 early_param("memmap", early_parse_memmap);
>> 721
>> 722 #ifdef CONFIG_PROC_VMCORE
>> 723 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
>> 724 static int __init early_parse_elfcorehdr(char *p)
>> 725 {
>> 726 int i;
>> 727
>> 728 setup_elfcorehdr = memparse(p, &p);
>> 729
>> 730 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 731 unsigned long start = boot_mem_map.map[i].addr;
>> 732 unsigned long end = (boot_mem_map.map[i].addr +
>> 733 boot_mem_map.map[i].size);
>> 734 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
>> 735 /*
>> 736 * Reserve from the elf core header to the end of
>> 737 * the memory segment, that should all be kdump
>> 738 * reserved memory.
>> 739 */
>> 740 setup_elfcorehdr_size = end - setup_elfcorehdr;
>> 741 break;
>> 742 }
>> 743 }
>> 744 /*
>> 745 * If we don't find it in the memory map, then we shouldn't
>> 746 * have to worry about it, as the new kernel won't use it.
>> 747 */
>> 748 return 0;
>> 749 }
>> 750 early_param("elfcorehdr", early_parse_elfcorehdr);
>> 751 #endif
>> 752
>> 753 static void __init arch_mem_addpart(phys_addr_t mem, phys_addr_t end, int type)
>> 754 {
>> 755 phys_addr_t size;
>> 756 int i;
>> 757
>> 758 size = end - mem;
>> 759 if (!size)
>> 760 return;
>> 761
>> 762 /* Make sure it is in the boot_mem_map */
>> 763 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 764 if (mem >= boot_mem_map.map[i].addr &&
>> 765 mem < (boot_mem_map.map[i].addr +
>> 766 boot_mem_map.map[i].size))
>> 767 return;
>> 768 }
>> 769 add_memory_region(mem, size, type);
>> 770 }
>> 771
>> 772 #ifdef CONFIG_KEXEC
>> 773 static inline unsigned long long get_total_mem(void)
>> 774 {
>> 775 unsigned long long total;
>> 776
>> 777 total = max_pfn - min_low_pfn;
>> 778 return total << PAGE_SHIFT;
>> 779 }
>> 780
>> 781 static void __init mips_parse_crashkernel(void)
>> 782 {
>> 783 unsigned long long total_mem;
>> 784 unsigned long long crash_size, crash_base;
>> 785 int ret;
>> 786
>> 787 total_mem = get_total_mem();
>> 788 ret = parse_crashkernel(boot_command_line, total_mem,
>> 789 &crash_size, &crash_base);
>> 790 if (ret != 0 || crash_size <= 0)
>> 791 return;
>> 792
>> 793 if (!memory_region_available(crash_base, crash_size)) {
>> 794 pr_warn("Invalid memory region reserved for crash kernel\n");
>> 795 return;
>> 796 }
>> 797
>> 798 crashk_res.start = crash_base;
>> 799 crashk_res.end = crash_base + crash_size - 1;
>> 800 }
>> 801
>> 802 static void __init request_crashkernel(struct resource *res)
>> 803 {
>> 804 int ret;
>> 805
>> 806 if (crashk_res.start == crashk_res.end)
>> 807 return;
>> 808
>> 809 ret = request_resource(res, &crashk_res);
>> 810 if (!ret)
>> 811 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
>> 812 (unsigned long)((crashk_res.end -
>> 813 crashk_res.start + 1) >> 20),
>> 814 (unsigned long)(crashk_res.start >> 20));
>> 815 }
>> 816 #else /* !defined(CONFIG_KEXEC) */
>> 817 static void __init mips_parse_crashkernel(void)
>> 818 {
>> 819 }
>> 820
>> 821 static void __init request_crashkernel(struct resource *res)
>> 822 {
>> 823 }
>> 824 #endif /* !defined(CONFIG_KEXEC) */
>> 825
>> 826 #define USE_PROM_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_BOOTLOADER)
>> 827 #define USE_DTB_CMDLINE IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB)
>> 828 #define EXTEND_WITH_PROM IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND)
>> 829 #define BUILTIN_EXTEND_WITH_PROM \
>> 830 IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND)
>> 831
>> 832 static void __init arch_mem_init(char **cmdline_p)
>> 833 {
>> 834 struct memblock_region *reg;
>> 835 extern void plat_mem_setup(void);
>> 836
>> 837 /* call board setup routine */
>> 838 plat_mem_setup();
>> 839
>> 840 /*
>> 841 * Make sure all kernel memory is in the maps. The "UP" and
>> 842 * "DOWN" are opposite for initdata since if it crosses over
>> 843 * into another memory section you don't want that to be
>> 844 * freed when the initdata is freed.
>> 845 */
>> 846 arch_mem_addpart(PFN_DOWN(__pa_symbol(&_text)) << PAGE_SHIFT,
>> 847 PFN_UP(__pa_symbol(&_edata)) << PAGE_SHIFT,
>> 848 BOOT_MEM_RAM);
>> 849 arch_mem_addpart(PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT,
>> 850 PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT,
>> 851 BOOT_MEM_INIT_RAM);
>> 852
>> 853 pr_info("Determined physical RAM map:\n");
>> 854 print_memory_map();
>> 855
>> 856 #if defined(CONFIG_CMDLINE_BOOL) && defined(CONFIG_CMDLINE_OVERRIDE)
>> 857 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
4 #else 858 #else
5 #include "setup_no.c" !! 859 if ((USE_PROM_CMDLINE && arcs_cmdline[0]) ||
>> 860 (USE_DTB_CMDLINE && !boot_command_line[0]))
>> 861 strlcpy(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
>> 862
>> 863 if (EXTEND_WITH_PROM && arcs_cmdline[0]) {
>> 864 if (boot_command_line[0])
>> 865 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 866 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
>> 867 }
>> 868
>> 869 #if defined(CONFIG_CMDLINE_BOOL)
>> 870 if (builtin_cmdline[0]) {
>> 871 if (boot_command_line[0])
>> 872 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 873 strlcat(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 874 }
>> 875
>> 876 if (BUILTIN_EXTEND_WITH_PROM && arcs_cmdline[0]) {
>> 877 if (boot_command_line[0])
>> 878 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 879 strlcat(boot_command_line, arcs_cmdline, COMMAND_LINE_SIZE);
>> 880 }
>> 881 #endif
>> 882 #endif
>> 883 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>> 884
>> 885 *cmdline_p = command_line;
>> 886
>> 887 parse_early_param();
>> 888
>> 889 if (usermem) {
>> 890 pr_info("User-defined physical RAM map:\n");
>> 891 print_memory_map();
>> 892 }
>> 893
>> 894 early_init_fdt_reserve_self();
>> 895 early_init_fdt_scan_reserved_mem();
>> 896
>> 897 bootmem_init();
>> 898 #ifdef CONFIG_PROC_VMCORE
>> 899 if (setup_elfcorehdr && setup_elfcorehdr_size) {
>> 900 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
>> 901 setup_elfcorehdr, setup_elfcorehdr_size);
>> 902 reserve_bootmem(setup_elfcorehdr, setup_elfcorehdr_size,
>> 903 BOOTMEM_DEFAULT);
>> 904 }
>> 905 #endif
>> 906
>> 907 mips_parse_crashkernel();
>> 908 #ifdef CONFIG_KEXEC
>> 909 if (crashk_res.start != crashk_res.end)
>> 910 reserve_bootmem(crashk_res.start,
>> 911 crashk_res.end - crashk_res.start + 1,
>> 912 BOOTMEM_DEFAULT);
6 #endif 913 #endif
>> 914 device_tree_init();
>> 915 sparse_init();
>> 916 plat_swiotlb_setup();
>> 917
>> 918 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
>> 919 /* Tell bootmem about cma reserved memblock section */
>> 920 for_each_memblock(reserved, reg)
>> 921 if (reg->size != 0)
>> 922 reserve_bootmem(reg->base, reg->size, BOOTMEM_DEFAULT);
>> 923
>> 924 reserve_bootmem_region(__pa_symbol(&__nosave_begin),
>> 925 __pa_symbol(&__nosave_end)); /* Reserve for hibernation */
>> 926 }
>> 927
>> 928 static void __init resource_init(void)
>> 929 {
>> 930 int i;
>> 931
>> 932 if (UNCAC_BASE != IO_BASE)
>> 933 return;
>> 934
>> 935 code_resource.start = __pa_symbol(&_text);
>> 936 code_resource.end = __pa_symbol(&_etext) - 1;
>> 937 data_resource.start = __pa_symbol(&_etext);
>> 938 data_resource.end = __pa_symbol(&_edata) - 1;
>> 939 bss_resource.start = __pa_symbol(&__bss_start);
>> 940 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
>> 941
>> 942 for (i = 0; i < boot_mem_map.nr_map; i++) {
>> 943 struct resource *res;
>> 944 unsigned long start, end;
>> 945
>> 946 start = boot_mem_map.map[i].addr;
>> 947 end = boot_mem_map.map[i].addr + boot_mem_map.map[i].size - 1;
>> 948 if (start >= HIGHMEM_START)
>> 949 continue;
>> 950 if (end >= HIGHMEM_START)
>> 951 end = HIGHMEM_START - 1;
>> 952
>> 953 res = alloc_bootmem(sizeof(struct resource));
>> 954
>> 955 res->start = start;
>> 956 res->end = end;
>> 957 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
>> 958
>> 959 switch (boot_mem_map.map[i].type) {
>> 960 case BOOT_MEM_RAM:
>> 961 case BOOT_MEM_INIT_RAM:
>> 962 case BOOT_MEM_ROM_DATA:
>> 963 res->name = "System RAM";
>> 964 res->flags |= IORESOURCE_SYSRAM;
>> 965 break;
>> 966 case BOOT_MEM_RESERVED:
>> 967 default:
>> 968 res->name = "reserved";
>> 969 }
>> 970
>> 971 request_resource(&iomem_resource, res);
>> 972
>> 973 /*
>> 974 * We don't know which RAM region contains kernel data,
>> 975 * so we try it repeatedly and let the resource manager
>> 976 * test it.
>> 977 */
>> 978 request_resource(res, &code_resource);
>> 979 request_resource(res, &data_resource);
>> 980 request_resource(res, &bss_resource);
>> 981 request_crashkernel(res);
>> 982 }
>> 983 }
>> 984
>> 985 #ifdef CONFIG_SMP
>> 986 static void __init prefill_possible_map(void)
>> 987 {
>> 988 int i, possible = num_possible_cpus();
>> 989
>> 990 if (possible > nr_cpu_ids)
>> 991 possible = nr_cpu_ids;
>> 992
>> 993 for (i = 0; i < possible; i++)
>> 994 set_cpu_possible(i, true);
>> 995 for (; i < NR_CPUS; i++)
>> 996 set_cpu_possible(i, false);
>> 997
>> 998 nr_cpu_ids = possible;
>> 999 }
>> 1000 #else
>> 1001 static inline void prefill_possible_map(void) {}
>> 1002 #endif
>> 1003
>> 1004 void __init setup_arch(char **cmdline_p)
>> 1005 {
>> 1006 cpu_probe();
>> 1007 mips_cm_probe();
>> 1008 prom_init();
>> 1009
>> 1010 setup_early_fdc_console();
>> 1011 #ifdef CONFIG_EARLY_PRINTK
>> 1012 setup_early_printk();
>> 1013 #endif
>> 1014 cpu_report();
>> 1015 check_bugs_early();
>> 1016
>> 1017 #if defined(CONFIG_VT)
>> 1018 #if defined(CONFIG_VGA_CONSOLE)
>> 1019 conswitchp = &vga_con;
>> 1020 #elif defined(CONFIG_DUMMY_CONSOLE)
>> 1021 conswitchp = &dummy_con;
>> 1022 #endif
>> 1023 #endif
>> 1024
>> 1025 arch_mem_init(cmdline_p);
>> 1026
>> 1027 resource_init();
>> 1028 plat_smp_setup();
>> 1029 prefill_possible_map();
>> 1030
>> 1031 cpu_cache_init();
>> 1032 paging_init();
>> 1033 }
>> 1034
>> 1035 unsigned long kernelsp[NR_CPUS];
>> 1036 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
>> 1037
>> 1038 #ifdef CONFIG_USE_OF
>> 1039 unsigned long fw_passed_dtb;
>> 1040 #endif
>> 1041
>> 1042 #ifdef CONFIG_DEBUG_FS
>> 1043 struct dentry *mips_debugfs_dir;
>> 1044 static int __init debugfs_mips(void)
>> 1045 {
>> 1046 struct dentry *d;
7 1047
8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP) !! 1048 d = debugfs_create_dir("mips", NULL);
9 void (*mach_beep)(unsigned int, unsigned int); !! 1049 if (!d)
10 EXPORT_SYMBOL(mach_beep); !! 1050 return -ENOMEM;
>> 1051 mips_debugfs_dir = d;
>> 1052 return 0;
>> 1053 }
>> 1054 arch_initcall(debugfs_mips);
11 #endif 1055 #endif
12 1056
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