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/cpu.h>
>> 15 #include <linux/delay.h>
>> 16 #include <linux/ioport.h>
>> 17 #include <linux/export.h>
>> 18 #include <linux/screen_info.h>
>> 19 #include <linux/memblock.h>
>> 20 #include <linux/initrd.h>
>> 21 #include <linux/root_dev.h>
>> 22 #include <linux/highmem.h>
>> 23 #include <linux/console.h>
>> 24 #include <linux/pfn.h>
>> 25 #include <linux/debugfs.h>
>> 26 #include <linux/kexec.h>
>> 27 #include <linux/sizes.h>
>> 28 #include <linux/device.h>
>> 29 #include <linux/dma-map-ops.h>
>> 30 #include <linux/decompress/generic.h>
>> 31 #include <linux/of_fdt.h>
>> 32 #include <linux/dmi.h>
>> 33 #include <linux/crash_dump.h>
>> 34
>> 35 #include <asm/addrspace.h>
>> 36 #include <asm/bootinfo.h>
>> 37 #include <asm/bugs.h>
>> 38 #include <asm/cache.h>
>> 39 #include <asm/cdmm.h>
>> 40 #include <asm/cpu.h>
>> 41 #include <asm/debug.h>
>> 42 #include <asm/mmzone.h>
>> 43 #include <asm/sections.h>
>> 44 #include <asm/setup.h>
>> 45 #include <asm/smp-ops.h>
>> 46 #include <asm/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 #ifdef CONFIG_VGA_CONSOLE
>> 58 struct screen_info screen_info;
>> 59 #endif
>> 60
>> 61 /*
>> 62 * Setup information
>> 63 *
>> 64 * These are initialized so they are in the .data section
>> 65 */
>> 66 unsigned long mips_machtype __read_mostly = MACH_UNKNOWN;
>> 67
>> 68 EXPORT_SYMBOL(mips_machtype);
>> 69
>> 70 static char __initdata command_line[COMMAND_LINE_SIZE];
>> 71 char __initdata arcs_cmdline[COMMAND_LINE_SIZE];
>> 72
>> 73 #ifdef CONFIG_CMDLINE_BOOL
>> 74 static const char builtin_cmdline[] __initconst = CONFIG_CMDLINE;
>> 75 #else
>> 76 static const char builtin_cmdline[] __initconst = "";
>> 77 #endif
>> 78
>> 79 /*
>> 80 * mips_io_port_base is the begin of the address space to which x86 style
>> 81 * I/O ports are mapped.
>> 82 */
>> 83 unsigned long mips_io_port_base = -1;
>> 84 EXPORT_SYMBOL(mips_io_port_base);
>> 85
>> 86 static struct resource code_resource = { .name = "Kernel code", };
>> 87 static struct resource data_resource = { .name = "Kernel data", };
>> 88 static struct resource bss_resource = { .name = "Kernel bss", };
>> 89
>> 90 unsigned long __kaslr_offset __ro_after_init;
>> 91 EXPORT_SYMBOL(__kaslr_offset);
>> 92
>> 93 static void *detect_magic __initdata = detect_memory_region;
>> 94
>> 95 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 96 unsigned long ARCH_PFN_OFFSET;
>> 97 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
>> 98 #endif
>> 99
>> 100 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
>> 101 {
>> 102 void *dm = &detect_magic;
>> 103 phys_addr_t size;
>> 104
>> 105 for (size = sz_min; size < sz_max; size <<= 1) {
>> 106 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
>> 107 break;
>> 108 }
>> 109
>> 110 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
>> 111 ((unsigned long long) size) / SZ_1M,
>> 112 (unsigned long long) start,
>> 113 ((unsigned long long) sz_min) / SZ_1M,
>> 114 ((unsigned long long) sz_max) / SZ_1M);
>> 115
>> 116 memblock_add(start, size);
>> 117 }
>> 118
>> 119 /*
>> 120 * Manage initrd
>> 121 */
>> 122 #ifdef CONFIG_BLK_DEV_INITRD
>> 123
>> 124 static int __init rd_start_early(char *p)
>> 125 {
>> 126 unsigned long start = memparse(p, &p);
>> 127
>> 128 #ifdef CONFIG_64BIT
>> 129 /* Guess if the sign extension was forgotten by bootloader */
>> 130 if (start < XKPHYS)
>> 131 start = (int)start;
>> 132 #endif
>> 133 initrd_start = start;
>> 134 initrd_end += start;
>> 135 return 0;
>> 136 }
>> 137 early_param("rd_start", rd_start_early);
>> 138
>> 139 static int __init rd_size_early(char *p)
>> 140 {
>> 141 initrd_end += memparse(p, &p);
>> 142 return 0;
>> 143 }
>> 144 early_param("rd_size", rd_size_early);
>> 145
>> 146 /* it returns the next free pfn after initrd */
>> 147 static unsigned long __init init_initrd(void)
>> 148 {
>> 149 unsigned long end;
>> 150
>> 151 /*
>> 152 * Board specific code or command line parser should have
>> 153 * already set up initrd_start and initrd_end. In these cases
>> 154 * perfom sanity checks and use them if all looks good.
>> 155 */
>> 156 if (!initrd_start || initrd_end <= initrd_start)
>> 157 goto disable;
>> 158
>> 159 if (initrd_start & ~PAGE_MASK) {
>> 160 pr_err("initrd start must be page aligned\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 if (initrd_start < PAGE_OFFSET) {
>> 176 pr_err("initrd start < PAGE_OFFSET\n");
>> 177 goto disable;
>> 178 }
>> 179
>> 180 ROOT_DEV = Root_RAM0;
>> 181 return PFN_UP(end);
>> 182 disable:
>> 183 initrd_start = 0;
>> 184 initrd_end = 0;
>> 185 return 0;
>> 186 }
>> 187
>> 188 /* In some conditions (e.g. big endian bootloader with a little endian
>> 189 kernel), the initrd might appear byte swapped. Try to detect this and
>> 190 byte swap it if needed. */
>> 191 static void __init maybe_bswap_initrd(void)
>> 192 {
>> 193 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
>> 194 u64 buf;
>> 195
>> 196 /* Check for CPIO signature */
>> 197 if (!memcmp((void *)initrd_start, "070701", 6))
>> 198 return;
>> 199
>> 200 /* Check for compressed initrd */
>> 201 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
>> 202 return;
>> 203
>> 204 /* Try again with a byte swapped header */
>> 205 buf = swab64p((u64 *)initrd_start);
>> 206 if (!memcmp(&buf, "070701", 6) ||
>> 207 decompress_method((unsigned char *)(&buf), 8, NULL)) {
>> 208 unsigned long i;
>> 209
>> 210 pr_info("Byteswapped initrd detected\n");
>> 211 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
>> 212 swab64s((u64 *)i);
>> 213 }
>> 214 #endif
>> 215 }
>> 216
>> 217 static void __init finalize_initrd(void)
>> 218 {
>> 219 unsigned long size = initrd_end - initrd_start;
>> 220
>> 221 if (size == 0) {
>> 222 printk(KERN_INFO "Initrd not found or empty");
>> 223 goto disable;
>> 224 }
>> 225 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
>> 226 printk(KERN_ERR "Initrd extends beyond end of memory");
>> 227 goto disable;
>> 228 }
>> 229
>> 230 maybe_bswap_initrd();
>> 231
>> 232 memblock_reserve(__pa(initrd_start), size);
>> 233 initrd_below_start_ok = 1;
>> 234
>> 235 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
>> 236 initrd_start, size);
>> 237 return;
>> 238 disable:
>> 239 printk(KERN_CONT " - disabling initrd\n");
>> 240 initrd_start = 0;
>> 241 initrd_end = 0;
>> 242 }
>> 243
>> 244 #else /* !CONFIG_BLK_DEV_INITRD */
>> 245
>> 246 static unsigned long __init init_initrd(void)
>> 247 {
>> 248 return 0;
>> 249 }
>> 250
>> 251 #define finalize_initrd() do {} while (0)
>> 252
>> 253 #endif
>> 254
>> 255 /*
>> 256 * Initialize the bootmem allocator. It also setup initrd related data
>> 257 * if needed.
>> 258 */
>> 259 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
>> 260
>> 261 static void __init bootmem_init(void)
>> 262 {
>> 263 init_initrd();
>> 264 finalize_initrd();
>> 265 }
>> 266
>> 267 #else /* !CONFIG_SGI_IP27 */
>> 268
>> 269 static void __init bootmem_init(void)
>> 270 {
>> 271 phys_addr_t ramstart, ramend;
>> 272 unsigned long start, end;
>> 273 int i;
>> 274
>> 275 ramstart = memblock_start_of_DRAM();
>> 276 ramend = memblock_end_of_DRAM();
>> 277
>> 278 /*
>> 279 * Sanity check any INITRD first. We don't take it into account
>> 280 * for bootmem setup initially, rely on the end-of-kernel-code
>> 281 * as our memory range starting point. Once bootmem is inited we
>> 282 * will reserve the area used for the initrd.
>> 283 */
>> 284 init_initrd();
>> 285
>> 286 /* Reserve memory occupied by kernel. */
>> 287 memblock_reserve(__pa_symbol(&_text),
>> 288 __pa_symbol(&_end) - __pa_symbol(&_text));
>> 289
>> 290 /* max_low_pfn is not a number of pages but the end pfn of low mem */
>> 291
>> 292 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 293 ARCH_PFN_OFFSET = PFN_UP(ramstart);
>> 294 #else
>> 295 /*
>> 296 * Reserve any memory between the start of RAM and PHYS_OFFSET
>> 297 */
>> 298 if (ramstart > PHYS_OFFSET)
>> 299 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
>> 300
>> 301 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
>> 302 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
>> 303 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
>> 304 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
>> 305 }
>> 306 #endif
>> 307
>> 308 min_low_pfn = ARCH_PFN_OFFSET;
>> 309 max_pfn = PFN_DOWN(ramend);
>> 310 for_each_mem_pfn_range(i, MAX_NUMNODES, &start, &end, NULL) {
>> 311 /*
>> 312 * Skip highmem here so we get an accurate max_low_pfn if low
>> 313 * memory stops short of high memory.
>> 314 * If the region overlaps HIGHMEM_START, end is clipped so
>> 315 * max_pfn excludes the highmem portion.
>> 316 */
>> 317 if (start >= PFN_DOWN(HIGHMEM_START))
>> 318 continue;
>> 319 if (end > PFN_DOWN(HIGHMEM_START))
>> 320 end = PFN_DOWN(HIGHMEM_START);
>> 321 if (end > max_low_pfn)
>> 322 max_low_pfn = end;
>> 323 }
>> 324
>> 325 if (min_low_pfn >= max_low_pfn)
>> 326 panic("Incorrect memory mapping !!!");
>> 327
>> 328 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
>> 329 max_low_pfn = PFN_DOWN(HIGHMEM_START);
>> 330 #ifdef CONFIG_HIGHMEM
>> 331 highstart_pfn = max_low_pfn;
>> 332 highend_pfn = max_pfn;
>> 333 #else
>> 334 max_pfn = max_low_pfn;
>> 335 #endif
>> 336 }
>> 337
>> 338 /*
>> 339 * Reserve initrd memory if needed.
>> 340 */
>> 341 finalize_initrd();
>> 342 }
>> 343
>> 344 #endif /* CONFIG_SGI_IP27 */
>> 345
>> 346 static int usermem __initdata;
>> 347
>> 348 static int __init early_parse_mem(char *p)
>> 349 {
>> 350 phys_addr_t start, size;
>> 351
>> 352 if (!p) {
>> 353 pr_err("mem parameter is empty, do nothing\n");
>> 354 return -EINVAL;
>> 355 }
>> 356
>> 357 /*
>> 358 * If a user specifies memory size, we
>> 359 * blow away any automatically generated
>> 360 * size.
>> 361 */
>> 362 if (usermem == 0) {
>> 363 usermem = 1;
>> 364 memblock_remove(memblock_start_of_DRAM(),
>> 365 memblock_end_of_DRAM() - memblock_start_of_DRAM());
>> 366 }
>> 367 start = 0;
>> 368 size = memparse(p, &p);
>> 369 if (*p == '@')
>> 370 start = memparse(p + 1, &p);
>> 371
>> 372 if (IS_ENABLED(CONFIG_NUMA))
>> 373 memblock_add_node(start, size, pa_to_nid(start), MEMBLOCK_NONE);
>> 374 else
>> 375 memblock_add(start, size);
>> 376
>> 377 return 0;
>> 378 }
>> 379 early_param("mem", early_parse_mem);
>> 380
>> 381 static int __init early_parse_memmap(char *p)
>> 382 {
>> 383 char *oldp;
>> 384 u64 start_at, mem_size;
>> 385
>> 386 if (!p)
>> 387 return -EINVAL;
>> 388
>> 389 if (!strncmp(p, "exactmap", 8)) {
>> 390 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
>> 391 return 0;
>> 392 }
>> 393
>> 394 oldp = p;
>> 395 mem_size = memparse(p, &p);
>> 396 if (p == oldp)
>> 397 return -EINVAL;
>> 398
>> 399 if (*p == '@') {
>> 400 start_at = memparse(p+1, &p);
>> 401 memblock_add(start_at, mem_size);
>> 402 } else if (*p == '#') {
>> 403 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
>> 404 return -EINVAL;
>> 405 } else if (*p == '$') {
>> 406 start_at = memparse(p+1, &p);
>> 407 memblock_add(start_at, mem_size);
>> 408 memblock_reserve(start_at, mem_size);
>> 409 } else {
>> 410 pr_err("\"memmap\" invalid format!\n");
>> 411 return -EINVAL;
>> 412 }
>> 413
>> 414 if (*p == '\0') {
>> 415 usermem = 1;
>> 416 return 0;
>> 417 } else
>> 418 return -EINVAL;
>> 419 }
>> 420 early_param("memmap", early_parse_memmap);
>> 421
>> 422 static void __init mips_reserve_vmcore(void)
>> 423 {
>> 424 #ifdef CONFIG_PROC_VMCORE
>> 425 phys_addr_t start, end;
>> 426 u64 i;
>> 427
>> 428 if (!elfcorehdr_size) {
>> 429 for_each_mem_range(i, &start, &end) {
>> 430 if (elfcorehdr_addr >= start && elfcorehdr_addr < end) {
>> 431 /*
>> 432 * Reserve from the elf core header to the end of
>> 433 * the memory segment, that should all be kdump
>> 434 * reserved memory.
>> 435 */
>> 436 elfcorehdr_size = end - elfcorehdr_addr;
>> 437 break;
>> 438 }
>> 439 }
>> 440 }
>> 441
>> 442 pr_info("Reserving %ldKB of memory at %ldKB for kdump\n",
>> 443 (unsigned long)elfcorehdr_size >> 10, (unsigned long)elfcorehdr_addr >> 10);
>> 444
>> 445 memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
>> 446 #endif
>> 447 }
>> 448
>> 449 #ifdef CONFIG_KEXEC
>> 450
>> 451 /* 64M alignment for crash kernel regions */
>> 452 #define CRASH_ALIGN SZ_64M
>> 453 #define CRASH_ADDR_MAX SZ_512M
>> 454
>> 455 static void __init mips_parse_crashkernel(void)
>> 456 {
>> 457 unsigned long long total_mem;
>> 458 unsigned long long crash_size, crash_base;
>> 459 int ret;
>> 460
>> 461 total_mem = memblock_phys_mem_size();
>> 462 ret = parse_crashkernel(boot_command_line, total_mem,
>> 463 &crash_size, &crash_base);
>> 464 if (ret != 0 || crash_size <= 0)
>> 465 return;
>> 466
>> 467 if (crash_base <= 0) {
>> 468 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
>> 469 CRASH_ALIGN,
>> 470 CRASH_ADDR_MAX);
>> 471 if (!crash_base) {
>> 472 pr_warn("crashkernel reservation failed - No suitable area found.\n");
>> 473 return;
>> 474 }
>> 475 } else {
>> 476 unsigned long long start;
>> 477
>> 478 start = memblock_phys_alloc_range(crash_size, 1,
>> 479 crash_base,
>> 480 crash_base + crash_size);
>> 481 if (start != crash_base) {
>> 482 pr_warn("Invalid memory region reserved for crash kernel\n");
>> 483 return;
>> 484 }
>> 485 }
>> 486
>> 487 crashk_res.start = crash_base;
>> 488 crashk_res.end = crash_base + crash_size - 1;
>> 489 }
>> 490
>> 491 static void __init request_crashkernel(struct resource *res)
>> 492 {
>> 493 int ret;
>> 494
>> 495 if (crashk_res.start == crashk_res.end)
>> 496 return;
>> 497
>> 498 ret = request_resource(res, &crashk_res);
>> 499 if (!ret)
>> 500 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
>> 501 (unsigned long)(resource_size(&crashk_res) >> 20),
>> 502 (unsigned long)(crashk_res.start >> 20));
>> 503 }
>> 504 #else /* !defined(CONFIG_KEXEC) */
>> 505 static void __init mips_parse_crashkernel(void)
>> 506 {
>> 507 }
>> 508
>> 509 static void __init request_crashkernel(struct resource *res)
>> 510 {
>> 511 }
>> 512 #endif /* !defined(CONFIG_KEXEC) */
>> 513
>> 514 static void __init check_kernel_sections_mem(void)
>> 515 {
>> 516 phys_addr_t start = __pa_symbol(&_text);
>> 517 phys_addr_t size = __pa_symbol(&_end) - start;
>> 518
>> 519 if (!memblock_is_region_memory(start, size)) {
>> 520 pr_info("Kernel sections are not in the memory maps\n");
>> 521 memblock_add(start, size);
>> 522 }
>> 523 }
>> 524
>> 525 static void __init bootcmdline_append(const char *s, size_t max)
>> 526 {
>> 527 if (!s[0] || !max)
>> 528 return;
>> 529
>> 530 if (boot_command_line[0])
>> 531 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 532
>> 533 strlcat(boot_command_line, s, max);
>> 534 }
>> 535
>> 536 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 537
>> 538 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
>> 539 int depth, void *data)
>> 540 {
>> 541 bool *dt_bootargs = data;
>> 542 const char *p;
>> 543 int l;
>> 544
>> 545 if (depth != 1 || !data ||
>> 546 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
>> 547 return 0;
>> 548
>> 549 p = of_get_flat_dt_prop(node, "bootargs", &l);
>> 550 if (p != NULL && l > 0) {
>> 551 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
>> 552 *dt_bootargs = true;
>> 553 }
>> 554
>> 555 return 1;
>> 556 }
>> 557
>> 558 #endif /* CONFIG_OF_EARLY_FLATTREE */
>> 559
>> 560 static void __init bootcmdline_init(void)
>> 561 {
>> 562 bool dt_bootargs = false;
>> 563
>> 564 /*
>> 565 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
>> 566 * trivial - we simply use the built-in command line unconditionally &
>> 567 * unmodified.
>> 568 */
>> 569 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
>> 570 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 571 return;
>> 572 }
>> 573
>> 574 /*
>> 575 * If the user specified a built-in command line &
>> 576 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
>> 577 * prepended to arguments from the bootloader or DT so we'll copy them
>> 578 * to the start of boot_command_line here. Otherwise, empty
>> 579 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
>> 580 */
>> 581 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 582 strscpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 583 else
>> 584 boot_command_line[0] = 0;
>> 585
>> 586 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 587 /*
>> 588 * If we're configured to take boot arguments from DT, look for those
>> 589 * now.
>> 590 */
>> 591 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
>> 592 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
>> 593 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
>> 594 #endif
>> 595
>> 596 /*
>> 597 * If we didn't get any arguments from DT (regardless of whether that's
>> 598 * because we weren't configured to look for them, or because we looked
>> 599 * & found none) then we'll take arguments from the bootloader.
>> 600 * plat_mem_setup() should have filled arcs_cmdline with arguments from
>> 601 * the bootloader.
>> 602 */
>> 603 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
>> 604 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
>> 605
>> 606 /*
>> 607 * If the user specified a built-in command line & we didn't already
>> 608 * prepend it, we append it to boot_command_line here.
>> 609 */
>> 610 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
>> 611 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 612 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
>> 613 }
>> 614
>> 615 /*
>> 616 * arch_mem_init - initialize memory management subsystem
>> 617 *
>> 618 * o plat_mem_setup() detects the memory configuration and will record detected
>> 619 * memory areas using memblock_add.
>> 620 *
>> 621 * At this stage the memory configuration of the system is known to the
>> 622 * kernel but generic memory management system is still entirely uninitialized.
>> 623 *
>> 624 * o bootmem_init()
>> 625 * o sparse_init()
>> 626 * o paging_init()
>> 627 * o dma_contiguous_reserve()
>> 628 *
>> 629 * At this stage the bootmem allocator is ready to use.
>> 630 *
>> 631 * NOTE: historically plat_mem_setup did the entire platform initialization.
>> 632 * This was rather impractical because it meant plat_mem_setup had to
>> 633 * get away without any kind of memory allocator. To keep old code from
>> 634 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
>> 635 * initialization hook for anything else was introduced.
>> 636 */
>> 637 static void __init arch_mem_init(char **cmdline_p)
>> 638 {
>> 639 /* call board setup routine */
>> 640 plat_mem_setup();
>> 641 memblock_set_bottom_up(true);
>> 642
>> 643 bootcmdline_init();
>> 644 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>> 645 *cmdline_p = command_line;
>> 646
>> 647 parse_early_param();
>> 648
>> 649 if (usermem)
>> 650 pr_info("User-defined physical RAM map overwrite\n");
>> 651
>> 652 check_kernel_sections_mem();
>> 653
>> 654 early_init_fdt_reserve_self();
>> 655 early_init_fdt_scan_reserved_mem();
>> 656
>> 657 #ifndef CONFIG_NUMA
>> 658 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
>> 659 #endif
>> 660 bootmem_init();
>> 661
>> 662 /*
>> 663 * Prevent memblock from allocating high memory.
>> 664 * This cannot be done before max_low_pfn is detected, so up
>> 665 * to this point is possible to only reserve physical memory
>> 666 * with memblock_reserve; memblock_alloc* can be used
>> 667 * only after this point
>> 668 */
>> 669 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
>> 670
>> 671 mips_reserve_vmcore();
>> 672
>> 673 mips_parse_crashkernel();
>> 674 device_tree_init();
>> 675
>> 676 /*
>> 677 * In order to reduce the possibility of kernel panic when failed to
>> 678 * get IO TLB memory under CONFIG_SWIOTLB, it is better to allocate
>> 679 * low memory as small as possible before plat_swiotlb_setup(), so
>> 680 * make sparse_init() using top-down allocation.
>> 681 */
>> 682 memblock_set_bottom_up(false);
>> 683 sparse_init();
>> 684 memblock_set_bottom_up(true);
>> 685
>> 686 plat_swiotlb_setup();
>> 687
>> 688 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
>> 689
>> 690 /* Reserve for hibernation. */
>> 691 memblock_reserve(__pa_symbol(&__nosave_begin),
>> 692 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
>> 693
>> 694 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
>> 695 }
>> 696
>> 697 static void __init resource_init(void)
>> 698 {
>> 699 phys_addr_t start, end;
>> 700 u64 i;
>> 701
>> 702 if (UNCAC_BASE != IO_BASE)
>> 703 return;
>> 704
>> 705 code_resource.start = __pa_symbol(&_text);
>> 706 code_resource.end = __pa_symbol(&_etext) - 1;
>> 707 data_resource.start = __pa_symbol(&_etext);
>> 708 data_resource.end = __pa_symbol(&_edata) - 1;
>> 709 bss_resource.start = __pa_symbol(&__bss_start);
>> 710 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
>> 711
>> 712 for_each_mem_range(i, &start, &end) {
>> 713 struct resource *res;
>> 714
>> 715 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
>> 716 if (!res)
>> 717 panic("%s: Failed to allocate %zu bytes\n", __func__,
>> 718 sizeof(struct resource));
>> 719
>> 720 res->start = start;
>> 721 /*
>> 722 * In memblock, end points to the first byte after the
>> 723 * range while in resourses, end points to the last byte in
>> 724 * the range.
>> 725 */
>> 726 res->end = end - 1;
>> 727 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
>> 728 res->name = "System RAM";
>> 729
>> 730 request_resource(&iomem_resource, res);
>> 731
>> 732 /*
>> 733 * We don't know which RAM region contains kernel data,
>> 734 * so we try it repeatedly and let the resource manager
>> 735 * test it.
>> 736 */
>> 737 request_resource(res, &code_resource);
>> 738 request_resource(res, &data_resource);
>> 739 request_resource(res, &bss_resource);
>> 740 request_crashkernel(res);
>> 741 }
>> 742 }
>> 743
>> 744 #ifdef CONFIG_SMP
>> 745 static void __init prefill_possible_map(void)
>> 746 {
>> 747 int i, possible = num_possible_cpus();
>> 748
>> 749 if (possible > nr_cpu_ids)
>> 750 possible = nr_cpu_ids;
>> 751
>> 752 for (i = 0; i < possible; i++)
>> 753 set_cpu_possible(i, true);
>> 754 for (; i < NR_CPUS; i++)
>> 755 set_cpu_possible(i, false);
>> 756
>> 757 set_nr_cpu_ids(possible);
>> 758 }
4 #else 759 #else
5 #include "setup_no.c" !! 760 static inline void prefill_possible_map(void) {}
6 #endif 761 #endif
7 762
8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP) !! 763 static void __init setup_rng_seed(void)
9 void (*mach_beep)(unsigned int, unsigned int); !! 764 {
10 EXPORT_SYMBOL(mach_beep); !! 765 char *rng_seed_hex = fw_getenv("rngseed");
>> 766 u8 rng_seed[512];
>> 767 size_t len;
>> 768
>> 769 if (!rng_seed_hex)
>> 770 return;
>> 771
>> 772 len = min(sizeof(rng_seed), strlen(rng_seed_hex) / 2);
>> 773 if (hex2bin(rng_seed, rng_seed_hex, len))
>> 774 return;
>> 775
>> 776 add_bootloader_randomness(rng_seed, len);
>> 777 memzero_explicit(rng_seed, len);
>> 778 memzero_explicit(rng_seed_hex, len * 2);
>> 779 }
>> 780
>> 781 void __init setup_arch(char **cmdline_p)
>> 782 {
>> 783 cpu_probe();
>> 784 mips_cm_probe();
>> 785 prom_init();
>> 786
>> 787 setup_early_fdc_console();
>> 788 #ifdef CONFIG_EARLY_PRINTK
>> 789 setup_early_printk();
>> 790 #endif
>> 791 cpu_report();
>> 792 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
>> 793 check_bugs64_early();
>> 794
>> 795 #if defined(CONFIG_VT)
>> 796 #if defined(CONFIG_VGA_CONSOLE)
>> 797 conswitchp = &vga_con;
>> 798 #endif
>> 799 #endif
>> 800
>> 801 arch_mem_init(cmdline_p);
>> 802 dmi_setup();
>> 803
>> 804 resource_init();
>> 805 plat_smp_setup();
>> 806 prefill_possible_map();
>> 807
>> 808 cpu_cache_init();
>> 809 paging_init();
>> 810
>> 811 memblock_dump_all();
>> 812
>> 813 setup_rng_seed();
>> 814 }
>> 815
>> 816 unsigned long kernelsp[NR_CPUS];
>> 817 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
>> 818
>> 819 #ifdef CONFIG_DEBUG_FS
>> 820 struct dentry *mips_debugfs_dir;
>> 821 static int __init debugfs_mips(void)
>> 822 {
>> 823 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
>> 824 return 0;
>> 825 }
>> 826 arch_initcall(debugfs_mips);
>> 827 #endif
>> 828
>> 829 #ifdef CONFIG_DMA_NONCOHERENT
>> 830 static int __init setcoherentio(char *str)
>> 831 {
>> 832 dma_default_coherent = true;
>> 833 pr_info("Hardware DMA cache coherency (command line)\n");
>> 834 return 0;
>> 835 }
>> 836 early_param("coherentio", setcoherentio);
>> 837
>> 838 static int __init setnocoherentio(char *str)
>> 839 {
>> 840 dma_default_coherent = false;
>> 841 pr_info("Software DMA cache coherency (command line)\n");
>> 842 return 0;
>> 843 }
>> 844 early_param("nocoherentio", setnocoherentio);
11 #endif 845 #endif
>> 846
>> 847 void __init arch_cpu_finalize_init(void)
>> 848 {
>> 849 unsigned int cpu = smp_processor_id();
>> 850
>> 851 cpu_data[cpu].udelay_val = loops_per_jiffy;
>> 852 check_bugs32();
>> 853
>> 854 if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
>> 855 check_bugs64();
>> 856 }
12 857
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