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