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/initrd.h>
>> 19 #include <linux/root_dev.h>
>> 20 #include <linux/highmem.h>
>> 21 #include <linux/console.h>
>> 22 #include <linux/pfn.h>
>> 23 #include <linux/debugfs.h>
>> 24 #include <linux/kexec.h>
>> 25 #include <linux/sizes.h>
>> 26 #include <linux/device.h>
>> 27 #include <linux/dma-map-ops.h>
>> 28 #include <linux/decompress/generic.h>
>> 29 #include <linux/of_fdt.h>
>> 30 #include <linux/dmi.h>
>> 31 #include <linux/crash_dump.h>
>> 32
>> 33 #include <asm/addrspace.h>
>> 34 #include <asm/bootinfo.h>
>> 35 #include <asm/bugs.h>
>> 36 #include <asm/cache.h>
>> 37 #include <asm/cdmm.h>
>> 38 #include <asm/cpu.h>
>> 39 #include <asm/debug.h>
>> 40 #include <asm/sections.h>
>> 41 #include <asm/setup.h>
>> 42 #include <asm/smp-ops.h>
>> 43 #include <asm/prom.h>
>> 44
>> 45 #ifdef CONFIG_MIPS_ELF_APPENDED_DTB
>> 46 char __section(".appended_dtb") __appended_dtb[0x100000];
>> 47 #endif /* CONFIG_MIPS_ELF_APPENDED_DTB */
>> 48
>> 49 struct cpuinfo_mips cpu_data[NR_CPUS] __read_mostly;
>> 50
>> 51 EXPORT_SYMBOL(cpu_data);
>> 52
>> 53 #ifdef CONFIG_VT
>> 54 struct screen_info screen_info;
>> 55 #endif
>> 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 * perfom 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 if (initrd_start < PAGE_OFFSET) {
>> 160 pr_err("initrd start < PAGE_OFFSET\n");
>> 161 goto disable;
>> 162 }
>> 163
>> 164 /*
>> 165 * Sanitize initrd addresses. For example firmware
>> 166 * can't guess if they need to pass them through
>> 167 * 64-bits values if the kernel has been built in pure
>> 168 * 32-bit. We need also to switch from KSEG0 to XKPHYS
>> 169 * addresses now, so the code can now safely use __pa().
>> 170 */
>> 171 end = __pa(initrd_end);
>> 172 initrd_end = (unsigned long)__va(end);
>> 173 initrd_start = (unsigned long)__va(__pa(initrd_start));
>> 174
>> 175 ROOT_DEV = Root_RAM0;
>> 176 return PFN_UP(end);
>> 177 disable:
>> 178 initrd_start = 0;
>> 179 initrd_end = 0;
>> 180 return 0;
>> 181 }
>> 182
>> 183 /* In some conditions (e.g. big endian bootloader with a little endian
>> 184 kernel), the initrd might appear byte swapped. Try to detect this and
>> 185 byte swap it if needed. */
>> 186 static void __init maybe_bswap_initrd(void)
>> 187 {
>> 188 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
>> 189 u64 buf;
>> 190
>> 191 /* Check for CPIO signature */
>> 192 if (!memcmp((void *)initrd_start, "070701", 6))
>> 193 return;
>> 194
>> 195 /* Check for compressed initrd */
>> 196 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
>> 197 return;
>> 198
>> 199 /* Try again with a byte swapped header */
>> 200 buf = swab64p((u64 *)initrd_start);
>> 201 if (!memcmp(&buf, "070701", 6) ||
>> 202 decompress_method((unsigned char *)(&buf), 8, NULL)) {
>> 203 unsigned long i;
>> 204
>> 205 pr_info("Byteswapped initrd detected\n");
>> 206 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
>> 207 swab64s((u64 *)i);
>> 208 }
>> 209 #endif
>> 210 }
>> 211
>> 212 static void __init finalize_initrd(void)
>> 213 {
>> 214 unsigned long size = initrd_end - initrd_start;
>> 215
>> 216 if (size == 0) {
>> 217 printk(KERN_INFO "Initrd not found or empty");
>> 218 goto disable;
>> 219 }
>> 220 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
>> 221 printk(KERN_ERR "Initrd extends beyond end of memory");
>> 222 goto disable;
>> 223 }
>> 224
>> 225 maybe_bswap_initrd();
>> 226
>> 227 memblock_reserve(__pa(initrd_start), size);
>> 228 initrd_below_start_ok = 1;
>> 229
>> 230 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
>> 231 initrd_start, size);
>> 232 return;
>> 233 disable:
>> 234 printk(KERN_CONT " - disabling initrd\n");
>> 235 initrd_start = 0;
>> 236 initrd_end = 0;
>> 237 }
>> 238
>> 239 #else /* !CONFIG_BLK_DEV_INITRD */
>> 240
>> 241 static unsigned long __init init_initrd(void)
>> 242 {
>> 243 return 0;
>> 244 }
>> 245
>> 246 #define finalize_initrd() do {} while (0)
>> 247
>> 248 #endif
>> 249
>> 250 /*
>> 251 * Initialize the bootmem allocator. It also setup initrd related data
>> 252 * if needed.
>> 253 */
>> 254 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
>> 255
>> 256 static void __init bootmem_init(void)
>> 257 {
>> 258 init_initrd();
>> 259 finalize_initrd();
>> 260 }
>> 261
>> 262 #else /* !CONFIG_SGI_IP27 */
>> 263
>> 264 static void __init bootmem_init(void)
>> 265 {
>> 266 phys_addr_t ramstart, ramend;
>> 267 unsigned long start, end;
>> 268 int i;
>> 269
>> 270 ramstart = memblock_start_of_DRAM();
>> 271 ramend = memblock_end_of_DRAM();
>> 272
>> 273 /*
>> 274 * Sanity check any INITRD first. We don't take it into account
>> 275 * for bootmem setup initially, rely on the end-of-kernel-code
>> 276 * as our memory range starting point. Once bootmem is inited we
>> 277 * will reserve the area used for the initrd.
>> 278 */
>> 279 init_initrd();
>> 280
>> 281 /* Reserve memory occupied by kernel. */
>> 282 memblock_reserve(__pa_symbol(&_text),
>> 283 __pa_symbol(&_end) - __pa_symbol(&_text));
>> 284
>> 285 /* max_low_pfn is not a number of pages but the end pfn of low mem */
>> 286
>> 287 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 288 ARCH_PFN_OFFSET = PFN_UP(ramstart);
4 #else 289 #else
5 #include "setup_no.c" !! 290 /*
>> 291 * Reserve any memory between the start of RAM and PHYS_OFFSET
>> 292 */
>> 293 if (ramstart > PHYS_OFFSET)
>> 294 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
>> 295
>> 296 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
>> 297 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
>> 298 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
>> 299 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
>> 300 }
6 #endif 301 #endif
7 302
8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP) !! 303 min_low_pfn = ARCH_PFN_OFFSET;
9 void (*mach_beep)(unsigned int, unsigned int); !! 304 max_pfn = PFN_DOWN(ramend);
10 EXPORT_SYMBOL(mach_beep); !! 305 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
>> 306 /*
>> 307 * Skip highmem here so we get an accurate max_low_pfn if low
>> 308 * memory stops short of high memory.
>> 309 * If the region overlaps HIGHMEM_START, end is clipped so
>> 310 * max_pfn excludes the highmem portion.
>> 311 */
>> 312 if (start >= PFN_DOWN(HIGHMEM_START))
>> 313 continue;
>> 314 if (end > PFN_DOWN(HIGHMEM_START))
>> 315 end = PFN_DOWN(HIGHMEM_START);
>> 316 if (end > max_low_pfn)
>> 317 max_low_pfn = end;
>> 318 }
>> 319
>> 320 if (min_low_pfn >= max_low_pfn)
>> 321 panic("Incorrect memory mapping !!!");
>> 322
>> 323 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
>> 324 #ifdef CONFIG_HIGHMEM
>> 325 highstart_pfn = PFN_DOWN(HIGHMEM_START);
>> 326 highend_pfn = max_pfn;
>> 327 #else
>> 328 max_low_pfn = PFN_DOWN(HIGHMEM_START);
>> 329 max_pfn = max_low_pfn;
>> 330 #endif
>> 331 }
>> 332
>> 333 /*
>> 334 * Reserve initrd memory if needed.
>> 335 */
>> 336 finalize_initrd();
>> 337 }
>> 338
>> 339 #endif /* CONFIG_SGI_IP27 */
>> 340
>> 341 static int usermem __initdata;
>> 342
>> 343 static int __init early_parse_mem(char *p)
>> 344 {
>> 345 phys_addr_t start, size;
>> 346
>> 347 /*
>> 348 * If a user specifies memory size, we
>> 349 * blow away any automatically generated
>> 350 * size.
>> 351 */
>> 352 if (usermem == 0) {
>> 353 usermem = 1;
>> 354 memblock_remove(memblock_start_of_DRAM(),
>> 355 memblock_end_of_DRAM() - memblock_start_of_DRAM());
>> 356 }
>> 357 start = 0;
>> 358 size = memparse(p, &p);
>> 359 if (*p == '@')
>> 360 start = memparse(p + 1, &p);
>> 361
>> 362 memblock_add(start, size);
>> 363
>> 364 return 0;
>> 365 }
>> 366 early_param("mem", early_parse_mem);
>> 367
>> 368 static int __init early_parse_memmap(char *p)
>> 369 {
>> 370 char *oldp;
>> 371 u64 start_at, mem_size;
>> 372
>> 373 if (!p)
>> 374 return -EINVAL;
>> 375
>> 376 if (!strncmp(p, "exactmap", 8)) {
>> 377 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
>> 378 return 0;
>> 379 }
>> 380
>> 381 oldp = p;
>> 382 mem_size = memparse(p, &p);
>> 383 if (p == oldp)
>> 384 return -EINVAL;
>> 385
>> 386 if (*p == '@') {
>> 387 start_at = memparse(p+1, &p);
>> 388 memblock_add(start_at, mem_size);
>> 389 } else if (*p == '#') {
>> 390 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
>> 391 return -EINVAL;
>> 392 } else if (*p == '$') {
>> 393 start_at = memparse(p+1, &p);
>> 394 memblock_add(start_at, mem_size);
>> 395 memblock_reserve(start_at, mem_size);
>> 396 } else {
>> 397 pr_err("\"memmap\" invalid format!\n");
>> 398 return -EINVAL;
>> 399 }
>> 400
>> 401 if (*p == '\0') {
>> 402 usermem = 1;
>> 403 return 0;
>> 404 } else
>> 405 return -EINVAL;
>> 406 }
>> 407 early_param("memmap", early_parse_memmap);
>> 408
>> 409 static void __init mips_reserve_vmcore(void)
>> 410 {
>> 411 #ifdef CONFIG_PROC_VMCORE
>> 412 phys_addr_t start, end;
>> 413 u64 i;
>> 414
>> 415 if (!elfcorehdr_size) {
>> 416 for_each_mem_range(i, &start, &end) {
>> 417 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
>> 418 /*
>> 419 * Reserve from the elf core header to the end of
>> 420 * the memory segment, that should all be kdump
>> 421 * reserved memory.
>> 422 */
>> 423 elfcorehdr_size = end - elfcorehdr_addr;
>> 424 break;
>> 425 }
>> 426 }
>> 427 }
>> 428
>> 429 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
>> 430 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
>> 431
>> 432 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
>> 433 #endif
>> 434 }
>> 435
>> 436 #ifdef CONFIG_KEXEC
>> 437
>> 438 /* 64M alignment for crash kernel regions */
>> 439 #define CRASH_ALIGN SZ_64M
>> 440 #define CRASH_ADDR_MAX SZ_512M
>> 441
>> 442 static void __init mips_parse_crashkernel(void)
>> 443 {
>> 444 unsigned long long total_mem;
>> 445 unsigned long long crash_size, crash_base;
>> 446 int ret;
>> 447
>> 448 total_mem = memblock_phys_mem_size();
>> 449 ret = parse_crashkernel(boot_command_line, total_mem,
>> 450 &crash_size, &crash_base);
>> 451 if (ret != 0 || crash_size <= 0)
>> 452 return;
>> 453
>> 454 if (crash_base <= 0) {
>> 455 crash_base = memblock_find_in_range(CRASH_ALIGN, CRASH_ADDR_MAX,
>> 456 crash_size, CRASH_ALIGN);
>> 457 if (!crash_base) {
>> 458 pr_warn("crashkernel reservation failed - No suitable area found.\n");
>> 459 return;
>> 460 }
>> 461 } else {
>> 462 unsigned long long start;
>> 463
>> 464 start = memblock_find_in_range(crash_base, crash_base + crash_size,
>> 465 crash_size, 1);
>> 466 if (start != crash_base) {
>> 467 pr_warn("Invalid memory region reserved for crash kernel\n");
>> 468 return;
>> 469 }
>> 470 }
>> 471
>> 472 crashk_res.start = crash_base;
>> 473 crashk_res.end = crash_base + crash_size - 1;
>> 474 }
>> 475
>> 476 static void __init request_crashkernel(struct resource *res)
>> 477 {
>> 478 int ret;
>> 479
>> 480 if (crashk_res.start == crashk_res.end)
>> 481 return;
>> 482
>> 483 ret = request_resource(res, &crashk_res);
>> 484 if (!ret)
>> 485 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
>> 486 (unsigned long)(resource_size(&crashk_res) >> 20),
>> 487 (unsigned long)(crashk_res.start >> 20));
>> 488 }
>> 489 #else /* !defined(CONFIG_KEXEC) */
>> 490 static void __init mips_parse_crashkernel(void)
>> 491 {
>> 492 }
>> 493
>> 494 static void __init request_crashkernel(struct resource *res)
>> 495 {
>> 496 }
>> 497 #endif /* !defined(CONFIG_KEXEC) */
>> 498
>> 499 static void __init check_kernel_sections_mem(void)
>> 500 {
>> 501 phys_addr_t start = __pa_symbol(&_text);
>> 502 phys_addr_t size = __pa_symbol(&_end) - start;
>> 503
>> 504 if (!memblock_is_region_memory(start, size)) {
>> 505 pr_info("Kernel sections are not in the memory maps\n");
>> 506 memblock_add(start, size);
>> 507 }
>> 508 }
>> 509
>> 510 static void __init bootcmdline_append(const char *s, size_t max)
>> 511 {
>> 512 if (!s[0] || !max)
>> 513 return;
>> 514
>> 515 if (boot_command_line[0])
>> 516 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 517
>> 518 strlcat(boot_command_line, s, max);
>> 519 }
>> 520
>> 521 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 522
>> 523 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
>> 524 int depth, void *data)
>> 525 {
>> 526 bool *dt_bootargs = data;
>> 527 const char *p;
>> 528 int l;
>> 529
>> 530 if (depth != 1 || !data ||
>> 531 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
>> 532 return 0;
>> 533
>> 534 p = of_get_flat_dt_prop(node, "bootargs", &l);
>> 535 if (p != NULL && l > 0) {
>> 536 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
>> 537 *dt_bootargs = true;
>> 538 }
>> 539
>> 540 return 1;
>> 541 }
>> 542
>> 543 #endif /* CONFIG_OF_EARLY_FLATTREE */
>> 544
>> 545 static void __init bootcmdline_init(void)
>> 546 {
>> 547 bool dt_bootargs = false;
>> 548
>> 549 /*
>> 550 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
>> 551 * trivial - we simply use the built-in command line unconditionally &
>> 552 * unmodified.
>> 553 */
>> 554 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
>> 555 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 556 return;
>> 557 }
>> 558
>> 559 /*
>> 560 * If the user specified a built-in command line &
>> 561 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
>> 562 * prepended to arguments from the bootloader or DT so we'll copy them
>> 563 * to the start of boot_command_line here. Otherwise, empty
>> 564 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
>> 565 */
>> 566 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 567 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 568 else
>> 569 boot_command_line[0] = 0;
>> 570
>> 571 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 572 /*
>> 573 * If we're configured to take boot arguments from DT, look for those
>> 574 * now.
>> 575 */
>> 576 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
>> 577 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
>> 578 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
>> 579 #endif
>> 580
>> 581 /*
>> 582 * If we didn't get any arguments from DT (regardless of whether that's
>> 583 * because we weren't configured to look for them, or because we looked
>> 584 * & found none) then we'll take arguments from the bootloader.
>> 585 * plat_mem_setup() should have filled arcs_cmdline with arguments from
>> 586 * the bootloader.
>> 587 */
>> 588 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
>> 589 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
>> 590
>> 591 /*
>> 592 * If the user specified a built-in command line & we didn't already
>> 593 * prepend it, we append it to boot_command_line here.
>> 594 */
>> 595 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
>> 596 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 597 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
>> 598 }
>> 599
>> 600 /*
>> 601 * arch_mem_init - initialize memory management subsystem
>> 602 *
>> 603 * o plat_mem_setup() detects the memory configuration and will record detected
>> 604 * memory areas using memblock_add.
>> 605 *
>> 606 * At this stage the memory configuration of the system is known to the
>> 607 * kernel but generic memory management system is still entirely uninitialized.
>> 608 *
>> 609 * o bootmem_init()
>> 610 * o sparse_init()
>> 611 * o paging_init()
>> 612 * o dma_contiguous_reserve()
>> 613 *
>> 614 * At this stage the bootmem allocator is ready to use.
>> 615 *
>> 616 * NOTE: historically plat_mem_setup did the entire platform initialization.
>> 617 * This was rather impractical because it meant plat_mem_setup had to
>> 618 * get away without any kind of memory allocator. To keep old code from
>> 619 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
>> 620 * initialization hook for anything else was introduced.
>> 621 */
>> 622 static void __init arch_mem_init(char **cmdline_p)
>> 623 {
>> 624 /* call board setup routine */
>> 625 plat_mem_setup();
>> 626 memblock_set_bottom_up(true);
>> 627
>> 628 bootcmdline_init();
>> 629 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>> 630 *cmdline_p = command_line;
>> 631
>> 632 parse_early_param();
>> 633
>> 634 if (usermem)
>> 635 pr_info("User-defined physical RAM map overwrite\n");
>> 636
>> 637 check_kernel_sections_mem();
>> 638
>> 639 early_init_fdt_reserve_self();
>> 640 early_init_fdt_scan_reserved_mem();
>> 641
>> 642 #ifndef CONFIG_NUMA
>> 643 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
>> 644 #endif
>> 645 bootmem_init();
>> 646
>> 647 /*
>> 648 * Prevent memblock from allocating high memory.
>> 649 * This cannot be done before max_low_pfn is detected, so up
>> 650 * to this point is possible to only reserve physical memory
>> 651 * with memblock_reserve; memblock_alloc* can be used
>> 652 * only after this point
>> 653 */
>> 654 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
>> 655
>> 656 mips_reserve_vmcore();
>> 657
>> 658 mips_parse_crashkernel();
>> 659 #ifdef CONFIG_KEXEC
>> 660 if (crashk_res.start != crashk_res.end)
>> 661 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
>> 662 #endif
>> 663 device_tree_init();
>> 664
>> 665 /*
>> 666 * In order to reduce the possibility of kernel panic when failed to
>> 667 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
>> 668 * low memory as small as possible before plat_swiotlb_setup(), so
>> 669 * make sparse_init() using top-down allocation.
>> 670 */
>> 671 memblock_set_bottom_up(false);
>> 672 sparse_init();
>> 673 memblock_set_bottom_up(true);
>> 674
>> 675 plat_swiotlb_setup();
>> 676
>> 677 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
>> 678
>> 679 /* Reserve for hibernation. */
>> 680 memblock_reserve(__pa_symbol(&__nosave_begin),
>> 681 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
>> 682
>> 683 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
>> 684 }
>> 685
>> 686 static void __init resource_init(void)
>> 687 {
>> 688 phys_addr_t start, end;
>> 689 u64 i;
>> 690
>> 691 if (UNCAC_BASE != IO_BASE)
>> 692 return;
>> 693
>> 694 code_resource.start = __pa_symbol(&_text);
>> 695 code_resource.end = __pa_symbol(&_etext) - 1;
>> 696 data_resource.start = __pa_symbol(&_etext);
>> 697 data_resource.end = __pa_symbol(&_edata) - 1;
>> 698 bss_resource.start = __pa_symbol(&__bss_start);
>> 699 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
>> 700
>> 701 for_each_mem_range(i, &start, &end) {
>> 702 struct resource *res;
>> 703
>> 704 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
>> 705 if (!res)
>> 706 panic("%s: Failed to allocate %zu bytes\n", __func__,
>> 707 sizeof(struct resource));
>> 708
>> 709 res->start = start;
>> 710 /*
>> 711 * In memblock, end points to the first byte after the
>> 712 * range while in resourses, end points to the last byte in
>> 713 * the range.
>> 714 */
>> 715 res->end = end - 1;
>> 716 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
>> 717 res->name = "System RAM";
>> 718
>> 719 request_resource(&iomem_resource, res);
>> 720
>> 721 /*
>> 722 * We don't know which RAM region contains kernel data,
>> 723 * so we try it repeatedly and let the resource manager
>> 724 * test it.
>> 725 */
>> 726 request_resource(res, &code_resource);
>> 727 request_resource(res, &data_resource);
>> 728 request_resource(res, &bss_resource);
>> 729 request_crashkernel(res);
>> 730 }
>> 731 }
>> 732
>> 733 #ifdef CONFIG_SMP
>> 734 static void __init prefill_possible_map(void)
>> 735 {
>> 736 int i, possible = num_possible_cpus();
>> 737
>> 738 if (possible > nr_cpu_ids)
>> 739 possible = nr_cpu_ids;
>> 740
>> 741 for (i = 0; i < possible; i++)
>> 742 set_cpu_possible(i, true);
>> 743 for (; i < NR_CPUS; i++)
>> 744 set_cpu_possible(i, false);
>> 745
>> 746 nr_cpu_ids = possible;
>> 747 }
>> 748 #else
>> 749 static inline void prefill_possible_map(void) {}
>> 750 #endif
>> 751
>> 752 void __init setup_arch(char **cmdline_p)
>> 753 {
>> 754 cpu_probe();
>> 755 mips_cm_probe();
>> 756 prom_init();
>> 757
>> 758 setup_early_fdc_console();
>> 759 #ifdef CONFIG_EARLY_PRINTK
>> 760 setup_early_printk();
>> 761 #endif
>> 762 cpu_report();
>> 763 check_bugs_early();
>> 764
>> 765 #if defined(CONFIG_VT)
>> 766 #if defined(CONFIG_VGA_CONSOLE)
>> 767 conswitchp = &vga_con;
>> 768 #endif
>> 769 #endif
>> 770
>> 771 arch_mem_init(cmdline_p);
>> 772 dmi_setup();
>> 773
>> 774 resource_init();
>> 775 plat_smp_setup();
>> 776 prefill_possible_map();
>> 777
>> 778 cpu_cache_init();
>> 779 paging_init();
>> 780
>> 781 memblock_dump_all();
>> 782 }
>> 783
>> 784 unsigned long kernelsp[NR_CPUS];
>> 785 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
>> 786
>> 787 #ifdef CONFIG_DEBUG_FS
>> 788 struct dentry *mips_debugfs_dir;
>> 789 static int __init debugfs_mips(void)
>> 790 {
>> 791 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
>> 792 return 0;
>> 793 }
>> 794 arch_initcall(debugfs_mips);
>> 795 #endif
>> 796
>> 797 #ifdef CONFIG_DMA_NONCOHERENT
>> 798 static int __init setcoherentio(char *str)
>> 799 {
>> 800 dma_default_coherent = true;
>> 801 pr_info("Hardware DMA cache coherency (command line)\n");
>> 802 return 0;
>> 803 }
>> 804 early_param("coherentio", setcoherentio);
>> 805
>> 806 static int __init setnocoherentio(char *str)
>> 807 {
>> 808 dma_default_coherent = true;
>> 809 pr_info("Software DMA cache coherency (command line)\n");
>> 810 return 0;
>> 811 }
>> 812 early_param("nocoherentio", setnocoherentio);
11 #endif 813 #endif
12 814
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