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-contiguous.h>
>> 28 #include <linux/decompress/generic.h>
>> 29 #include <linux/of_fdt.h>
>> 30 #include <linux/of_reserved_mem.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/dma-coherence.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 const 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 static void *detect_magic __initdata = detect_memory_region;
>> 87
>> 88 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 89 unsigned long ARCH_PFN_OFFSET;
>> 90 EXPORT_SYMBOL(ARCH_PFN_OFFSET);
>> 91 #endif
>> 92
>> 93 void __init add_memory_region(phys_addr_t start, phys_addr_t size, long type)
>> 94 {
>> 95 /*
>> 96 * Note: This function only exists for historical reason,
>> 97 * new code should use memblock_add or memblock_add_node instead.
>> 98 */
>> 99
>> 100 /*
>> 101 * If the region reaches the top of the physical address space, adjust
>> 102 * the size slightly so that (start + size) doesn't overflow
>> 103 */
>> 104 if (start + size - 1 == PHYS_ADDR_MAX)
>> 105 --size;
>> 106
>> 107 /* Sanity check */
>> 108 if (start + size < start) {
>> 109 pr_warn("Trying to add an invalid memory region, skipped\n");
>> 110 return;
>> 111 }
>> 112
>> 113 if (start < PHYS_OFFSET)
>> 114 return;
>> 115
>> 116 memblock_add(start, size);
>> 117 /* Reserve any memory except the ordinary RAM ranges. */
>> 118 switch (type) {
>> 119 case BOOT_MEM_RAM:
>> 120 break;
>> 121
>> 122 case BOOT_MEM_NOMAP: /* Discard the range from the system. */
>> 123 memblock_remove(start, size);
>> 124 break;
>> 125
>> 126 default: /* Reserve the rest of the memory types at boot time */
>> 127 memblock_reserve(start, size);
>> 128 break;
>> 129 }
>> 130 }
>> 131
>> 132 void __init detect_memory_region(phys_addr_t start, phys_addr_t sz_min, phys_addr_t sz_max)
>> 133 {
>> 134 void *dm = &detect_magic;
>> 135 phys_addr_t size;
>> 136
>> 137 for (size = sz_min; size < sz_max; size <<= 1) {
>> 138 if (!memcmp(dm, dm + size, sizeof(detect_magic)))
>> 139 break;
>> 140 }
>> 141
>> 142 pr_debug("Memory: %lluMB of RAM detected at 0x%llx (min: %lluMB, max: %lluMB)\n",
>> 143 ((unsigned long long) size) / SZ_1M,
>> 144 (unsigned long long) start,
>> 145 ((unsigned long long) sz_min) / SZ_1M,
>> 146 ((unsigned long long) sz_max) / SZ_1M);
>> 147
>> 148 add_memory_region(start, size, BOOT_MEM_RAM);
>> 149 }
>> 150
>> 151 /*
>> 152 * Manage initrd
>> 153 */
>> 154 #ifdef CONFIG_BLK_DEV_INITRD
>> 155
>> 156 static int __init rd_start_early(char *p)
>> 157 {
>> 158 unsigned long start = memparse(p, &p);
>> 159
>> 160 #ifdef CONFIG_64BIT
>> 161 /* Guess if the sign extension was forgotten by bootloader */
>> 162 if (start < XKPHYS)
>> 163 start = (int)start;
>> 164 #endif
>> 165 initrd_start = start;
>> 166 initrd_end += start;
>> 167 return 0;
>> 168 }
>> 169 early_param("rd_start", rd_start_early);
>> 170
>> 171 static int __init rd_size_early(char *p)
>> 172 {
>> 173 initrd_end += memparse(p, &p);
>> 174 return 0;
>> 175 }
>> 176 early_param("rd_size", rd_size_early);
>> 177
>> 178 /* it returns the next free pfn after initrd */
>> 179 static unsigned long __init init_initrd(void)
>> 180 {
>> 181 unsigned long end;
>> 182
>> 183 /*
>> 184 * Board specific code or command line parser should have
>> 185 * already set up initrd_start and initrd_end. In these cases
>> 186 * perfom sanity checks and use them if all looks good.
>> 187 */
>> 188 if (!initrd_start || initrd_end <= initrd_start)
>> 189 goto disable;
>> 190
>> 191 if (initrd_start & ~PAGE_MASK) {
>> 192 pr_err("initrd start must be page aligned\n");
>> 193 goto disable;
>> 194 }
>> 195 if (initrd_start < PAGE_OFFSET) {
>> 196 pr_err("initrd start < PAGE_OFFSET\n");
>> 197 goto disable;
>> 198 }
>> 199
>> 200 /*
>> 201 * Sanitize initrd addresses. For example firmware
>> 202 * can't guess if they need to pass them through
>> 203 * 64-bits values if the kernel has been built in pure
>> 204 * 32-bit. We need also to switch from KSEG0 to XKPHYS
>> 205 * addresses now, so the code can now safely use __pa().
>> 206 */
>> 207 end = __pa(initrd_end);
>> 208 initrd_end = (unsigned long)__va(end);
>> 209 initrd_start = (unsigned long)__va(__pa(initrd_start));
>> 210
>> 211 ROOT_DEV = Root_RAM0;
>> 212 return PFN_UP(end);
>> 213 disable:
>> 214 initrd_start = 0;
>> 215 initrd_end = 0;
>> 216 return 0;
>> 217 }
>> 218
>> 219 /* In some conditions (e.g. big endian bootloader with a little endian
>> 220 kernel), the initrd might appear byte swapped. Try to detect this and
>> 221 byte swap it if needed. */
>> 222 static void __init maybe_bswap_initrd(void)
>> 223 {
>> 224 #if defined(CONFIG_CPU_CAVIUM_OCTEON)
>> 225 u64 buf;
>> 226
>> 227 /* Check for CPIO signature */
>> 228 if (!memcmp((void *)initrd_start, "070701", 6))
>> 229 return;
>> 230
>> 231 /* Check for compressed initrd */
>> 232 if (decompress_method((unsigned char *)initrd_start, 8, NULL))
>> 233 return;
>> 234
>> 235 /* Try again with a byte swapped header */
>> 236 buf = swab64p((u64 *)initrd_start);
>> 237 if (!memcmp(&buf, "070701", 6) ||
>> 238 decompress_method((unsigned char *)(&buf), 8, NULL)) {
>> 239 unsigned long i;
>> 240
>> 241 pr_info("Byteswapped initrd detected\n");
>> 242 for (i = initrd_start; i < ALIGN(initrd_end, 8); i += 8)
>> 243 swab64s((u64 *)i);
>> 244 }
>> 245 #endif
>> 246 }
>> 247
>> 248 static void __init finalize_initrd(void)
>> 249 {
>> 250 unsigned long size = initrd_end - initrd_start;
>> 251
>> 252 if (size == 0) {
>> 253 printk(KERN_INFO "Initrd not found or empty");
>> 254 goto disable;
>> 255 }
>> 256 if (__pa(initrd_end) > PFN_PHYS(max_low_pfn)) {
>> 257 printk(KERN_ERR "Initrd extends beyond end of memory");
>> 258 goto disable;
>> 259 }
>> 260
>> 261 maybe_bswap_initrd();
>> 262
>> 263 memblock_reserve(__pa(initrd_start), size);
>> 264 initrd_below_start_ok = 1;
>> 265
>> 266 pr_info("Initial ramdisk at: 0x%lx (%lu bytes)\n",
>> 267 initrd_start, size);
>> 268 return;
>> 269 disable:
>> 270 printk(KERN_CONT " - disabling initrd\n");
>> 271 initrd_start = 0;
>> 272 initrd_end = 0;
>> 273 }
>> 274
>> 275 #else /* !CONFIG_BLK_DEV_INITRD */
>> 276
>> 277 static unsigned long __init init_initrd(void)
>> 278 {
>> 279 return 0;
>> 280 }
>> 281
>> 282 #define finalize_initrd() do {} while (0)
>> 283
>> 284 #endif
>> 285
>> 286 /*
>> 287 * Initialize the bootmem allocator. It also setup initrd related data
>> 288 * if needed.
>> 289 */
>> 290 #if defined(CONFIG_SGI_IP27) || (defined(CONFIG_CPU_LOONGSON64) && defined(CONFIG_NUMA))
>> 291
>> 292 static void __init bootmem_init(void)
>> 293 {
>> 294 init_initrd();
>> 295 finalize_initrd();
>> 296 }
>> 297
>> 298 #else /* !CONFIG_SGI_IP27 */
>> 299
>> 300 static void __init bootmem_init(void)
>> 301 {
>> 302 struct memblock_region *mem;
>> 303 phys_addr_t ramstart, ramend;
>> 304
>> 305 ramstart = memblock_start_of_DRAM();
>> 306 ramend = memblock_end_of_DRAM();
>> 307
>> 308 /*
>> 309 * Sanity check any INITRD first. We don't take it into account
>> 310 * for bootmem setup initially, rely on the end-of-kernel-code
>> 311 * as our memory range starting point. Once bootmem is inited we
>> 312 * will reserve the area used for the initrd.
>> 313 */
>> 314 init_initrd();
>> 315
>> 316 /* Reserve memory occupied by kernel. */
>> 317 memblock_reserve(__pa_symbol(&_text),
>> 318 __pa_symbol(&_end) - __pa_symbol(&_text));
>> 319
>> 320 /* max_low_pfn is not a number of pages but the end pfn of low mem */
>> 321
>> 322 #ifdef CONFIG_MIPS_AUTO_PFN_OFFSET
>> 323 ARCH_PFN_OFFSET = PFN_UP(ramstart);
>> 324 #else
>> 325 /*
>> 326 * Reserve any memory between the start of RAM and PHYS_OFFSET
>> 327 */
>> 328 if (ramstart > PHYS_OFFSET)
>> 329 memblock_reserve(PHYS_OFFSET, ramstart - PHYS_OFFSET);
>> 330
>> 331 if (PFN_UP(ramstart) > ARCH_PFN_OFFSET) {
>> 332 pr_info("Wasting %lu bytes for tracking %lu unused pages\n",
>> 333 (unsigned long)((PFN_UP(ramstart) - ARCH_PFN_OFFSET) * sizeof(struct page)),
>> 334 (unsigned long)(PFN_UP(ramstart) - ARCH_PFN_OFFSET));
>> 335 }
>> 336 #endif
>> 337
>> 338 min_low_pfn = ARCH_PFN_OFFSET;
>> 339 max_pfn = PFN_DOWN(ramend);
>> 340 for_each_memblock(memory, mem) {
>> 341 unsigned long start = memblock_region_memory_base_pfn(mem);
>> 342 unsigned long end = memblock_region_memory_end_pfn(mem);
>> 343
>> 344 /*
>> 345 * Skip highmem here so we get an accurate max_low_pfn if low
>> 346 * memory stops short of high memory.
>> 347 * If the region overlaps HIGHMEM_START, end is clipped so
>> 348 * max_pfn excludes the highmem portion.
>> 349 */
>> 350 if (memblock_is_nomap(mem))
>> 351 continue;
>> 352 if (start >= PFN_DOWN(HIGHMEM_START))
>> 353 continue;
>> 354 if (end > PFN_DOWN(HIGHMEM_START))
>> 355 end = PFN_DOWN(HIGHMEM_START);
>> 356 if (end > max_low_pfn)
>> 357 max_low_pfn = end;
>> 358 }
>> 359
>> 360 if (min_low_pfn >= max_low_pfn)
>> 361 panic("Incorrect memory mapping !!!");
>> 362
>> 363 if (max_pfn > PFN_DOWN(HIGHMEM_START)) {
>> 364 #ifdef CONFIG_HIGHMEM
>> 365 highstart_pfn = PFN_DOWN(HIGHMEM_START);
>> 366 highend_pfn = max_pfn;
>> 367 #else
>> 368 max_low_pfn = PFN_DOWN(HIGHMEM_START);
>> 369 max_pfn = max_low_pfn;
>> 370 #endif
>> 371 }
>> 372
>> 373
>> 374 /*
>> 375 * In any case the added to the memblock memory regions
>> 376 * (highmem/lowmem, available/reserved, etc) are considered
>> 377 * as present, so inform sparsemem about them.
>> 378 */
>> 379 memblocks_present();
>> 380
>> 381 /*
>> 382 * Reserve initrd memory if needed.
>> 383 */
>> 384 finalize_initrd();
>> 385 }
>> 386
>> 387 #endif /* CONFIG_SGI_IP27 */
>> 388
>> 389 static int usermem __initdata;
>> 390
>> 391 static int __init early_parse_mem(char *p)
>> 392 {
>> 393 phys_addr_t start, size;
>> 394
>> 395 /*
>> 396 * If a user specifies memory size, we
>> 397 * blow away any automatically generated
>> 398 * size.
>> 399 */
>> 400 if (usermem == 0) {
>> 401 usermem = 1;
>> 402 memblock_remove(memblock_start_of_DRAM(),
>> 403 memblock_end_of_DRAM() - memblock_start_of_DRAM());
>> 404 }
>> 405 start = 0;
>> 406 size = memparse(p, &p);
>> 407 if (*p == '@')
>> 408 start = memparse(p + 1, &p);
>> 409
>> 410 add_memory_region(start, size, BOOT_MEM_RAM);
>> 411
>> 412 return 0;
>> 413 }
>> 414 early_param("mem", early_parse_mem);
>> 415
>> 416 static int __init early_parse_memmap(char *p)
>> 417 {
>> 418 char *oldp;
>> 419 u64 start_at, mem_size;
>> 420
>> 421 if (!p)
>> 422 return -EINVAL;
>> 423
>> 424 if (!strncmp(p, "exactmap", 8)) {
>> 425 pr_err("\"memmap=exactmap\" invalid on MIPS\n");
>> 426 return 0;
>> 427 }
>> 428
>> 429 oldp = p;
>> 430 mem_size = memparse(p, &p);
>> 431 if (p == oldp)
>> 432 return -EINVAL;
>> 433
>> 434 if (*p == '@') {
>> 435 start_at = memparse(p+1, &p);
>> 436 add_memory_region(start_at, mem_size, BOOT_MEM_RAM);
>> 437 } else if (*p == '#') {
>> 438 pr_err("\"memmap=nn#ss\" (force ACPI data) invalid on MIPS\n");
>> 439 return -EINVAL;
>> 440 } else if (*p == '$') {
>> 441 start_at = memparse(p+1, &p);
>> 442 add_memory_region(start_at, mem_size, BOOT_MEM_RESERVED);
>> 443 } else {
>> 444 pr_err("\"memmap\" invalid format!\n");
>> 445 return -EINVAL;
>> 446 }
>> 447
>> 448 if (*p == '\0') {
>> 449 usermem = 1;
>> 450 return 0;
>> 451 } else
>> 452 return -EINVAL;
>> 453 }
>> 454 early_param("memmap", early_parse_memmap);
>> 455
>> 456 #ifdef CONFIG_PROC_VMCORE
>> 457 unsigned long setup_elfcorehdr, setup_elfcorehdr_size;
>> 458 static int __init early_parse_elfcorehdr(char *p)
>> 459 {
>> 460 struct memblock_region *mem;
>> 461
>> 462 setup_elfcorehdr = memparse(p, &p);
>> 463
>> 464 for_each_memblock(memory, mem) {
>> 465 unsigned long start = mem->base;
>> 466 unsigned long end = start + mem->size;
>> 467 if (setup_elfcorehdr >= start && setup_elfcorehdr < end) {
>> 468 /*
>> 469 * Reserve from the elf core header to the end of
>> 470 * the memory segment, that should all be kdump
>> 471 * reserved memory.
>> 472 */
>> 473 setup_elfcorehdr_size = end - setup_elfcorehdr;
>> 474 break;
>> 475 }
>> 476 }
>> 477 /*
>> 478 * If we don't find it in the memory map, then we shouldn't
>> 479 * have to worry about it, as the new kernel won't use it.
>> 480 */
>> 481 return 0;
>> 482 }
>> 483 early_param("elfcorehdr", early_parse_elfcorehdr);
>> 484 #endif
>> 485
>> 486 #ifdef CONFIG_KEXEC
>> 487 static void __init mips_parse_crashkernel(void)
>> 488 {
>> 489 unsigned long long total_mem;
>> 490 unsigned long long crash_size, crash_base;
>> 491 int ret;
>> 492
>> 493 total_mem = memblock_phys_mem_size();
>> 494 ret = parse_crashkernel(boot_command_line, total_mem,
>> 495 &crash_size, &crash_base);
>> 496 if (ret != 0 || crash_size <= 0)
>> 497 return;
>> 498
>> 499 if (!memblock_find_in_range(crash_base, crash_base + crash_size, crash_size, 0)) {
>> 500 pr_warn("Invalid memory region reserved for crash kernel\n");
>> 501 return;
>> 502 }
>> 503
>> 504 crashk_res.start = crash_base;
>> 505 crashk_res.end = crash_base + crash_size - 1;
>> 506 }
>> 507
>> 508 static void __init request_crashkernel(struct resource *res)
>> 509 {
>> 510 int ret;
>> 511
>> 512 if (crashk_res.start == crashk_res.end)
>> 513 return;
>> 514
>> 515 ret = request_resource(res, &crashk_res);
>> 516 if (!ret)
>> 517 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",
>> 518 (unsigned long)(resource_size(&crashk_res) >> 20),
>> 519 (unsigned long)(crashk_res.start >> 20));
>> 520 }
>> 521 #else /* !defined(CONFIG_KEXEC) */
>> 522 static void __init mips_parse_crashkernel(void)
>> 523 {
>> 524 }
>> 525
>> 526 static void __init request_crashkernel(struct resource *res)
>> 527 {
>> 528 }
>> 529 #endif /* !defined(CONFIG_KEXEC) */
>> 530
>> 531 static void __init check_kernel_sections_mem(void)
>> 532 {
>> 533 phys_addr_t start = PFN_PHYS(PFN_DOWN(__pa_symbol(&_text)));
>> 534 phys_addr_t size = PFN_PHYS(PFN_UP(__pa_symbol(&_end))) - start;
>> 535
>> 536 if (!memblock_is_region_memory(start, size)) {
>> 537 pr_info("Kernel sections are not in the memory maps\n");
>> 538 memblock_add(start, size);
>> 539 }
>> 540 }
>> 541
>> 542 static void __init bootcmdline_append(const char *s, size_t max)
>> 543 {
>> 544 if (!s[0] || !max)
>> 545 return;
>> 546
>> 547 if (boot_command_line[0])
>> 548 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
>> 549
>> 550 strlcat(boot_command_line, s, max);
>> 551 }
>> 552
>> 553 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 554
>> 555 static int __init bootcmdline_scan_chosen(unsigned long node, const char *uname,
>> 556 int depth, void *data)
>> 557 {
>> 558 bool *dt_bootargs = data;
>> 559 const char *p;
>> 560 int l;
>> 561
>> 562 if (depth != 1 || !data ||
>> 563 (strcmp(uname, "chosen") != 0 && strcmp(uname, "chosen@0") != 0))
>> 564 return 0;
>> 565
>> 566 p = of_get_flat_dt_prop(node, "bootargs", &l);
>> 567 if (p != NULL && l > 0) {
>> 568 bootcmdline_append(p, min(l, COMMAND_LINE_SIZE));
>> 569 *dt_bootargs = true;
>> 570 }
>> 571
>> 572 return 1;
>> 573 }
>> 574
>> 575 #endif /* CONFIG_OF_EARLY_FLATTREE */
>> 576
>> 577 static void __init bootcmdline_init(char **cmdline_p)
>> 578 {
>> 579 bool dt_bootargs = false;
>> 580
>> 581 /*
>> 582 * If CMDLINE_OVERRIDE is enabled then initializing the command line is
>> 583 * trivial - we simply use the built-in command line unconditionally &
>> 584 * unmodified.
>> 585 */
>> 586 if (IS_ENABLED(CONFIG_CMDLINE_OVERRIDE)) {
>> 587 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 588 return;
>> 589 }
>> 590
>> 591 /*
>> 592 * If the user specified a built-in command line &
>> 593 * MIPS_CMDLINE_BUILTIN_EXTEND, then the built-in command line is
>> 594 * prepended to arguments from the bootloader or DT so we'll copy them
>> 595 * to the start of boot_command_line here. Otherwise, empty
>> 596 * boot_command_line to undo anything early_init_dt_scan_chosen() did.
>> 597 */
>> 598 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 599 strlcpy(boot_command_line, builtin_cmdline, COMMAND_LINE_SIZE);
>> 600 else
>> 601 boot_command_line[0] = 0;
>> 602
>> 603 #ifdef CONFIG_OF_EARLY_FLATTREE
>> 604 /*
>> 605 * If we're configured to take boot arguments from DT, look for those
>> 606 * now.
>> 607 */
>> 608 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_FROM_DTB) ||
>> 609 IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND))
>> 610 of_scan_flat_dt(bootcmdline_scan_chosen, &dt_bootargs);
>> 611 #endif
>> 612
>> 613 /*
>> 614 * If we didn't get any arguments from DT (regardless of whether that's
>> 615 * because we weren't configured to look for them, or because we looked
>> 616 * & found none) then we'll take arguments from the bootloader.
>> 617 * plat_mem_setup() should have filled arcs_cmdline with arguments from
>> 618 * the bootloader.
>> 619 */
>> 620 if (IS_ENABLED(CONFIG_MIPS_CMDLINE_DTB_EXTEND) || !dt_bootargs)
>> 621 bootcmdline_append(arcs_cmdline, COMMAND_LINE_SIZE);
>> 622
>> 623 /*
>> 624 * If the user specified a built-in command line & we didn't already
>> 625 * prepend it, we append it to boot_command_line here.
>> 626 */
>> 627 if (IS_ENABLED(CONFIG_CMDLINE_BOOL) &&
>> 628 !IS_ENABLED(CONFIG_MIPS_CMDLINE_BUILTIN_EXTEND))
>> 629 bootcmdline_append(builtin_cmdline, COMMAND_LINE_SIZE);
>> 630 }
>> 631
>> 632 /*
>> 633 * arch_mem_init - initialize memory management subsystem
>> 634 *
>> 635 * o plat_mem_setup() detects the memory configuration and will record detected
>> 636 * memory areas using add_memory_region.
>> 637 *
>> 638 * At this stage the memory configuration of the system is known to the
>> 639 * kernel but generic memory management system is still entirely uninitialized.
>> 640 *
>> 641 * o bootmem_init()
>> 642 * o sparse_init()
>> 643 * o paging_init()
>> 644 * o dma_contiguous_reserve()
>> 645 *
>> 646 * At this stage the bootmem allocator is ready to use.
>> 647 *
>> 648 * NOTE: historically plat_mem_setup did the entire platform initialization.
>> 649 * This was rather impractical because it meant plat_mem_setup had to
>> 650 * get away without any kind of memory allocator. To keep old code from
>> 651 * breaking plat_setup was just renamed to plat_mem_setup and a second platform
>> 652 * initialization hook for anything else was introduced.
>> 653 */
>> 654 static void __init arch_mem_init(char **cmdline_p)
>> 655 {
>> 656 extern void plat_mem_setup(void);
>> 657
>> 658 /* call board setup routine */
>> 659 plat_mem_setup();
>> 660 memblock_set_bottom_up(true);
>> 661
>> 662 bootcmdline_init(cmdline_p);
>> 663 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
>> 664 *cmdline_p = command_line;
>> 665
>> 666 parse_early_param();
>> 667
>> 668 if (usermem)
>> 669 pr_info("User-defined physical RAM map overwrite\n");
>> 670
>> 671 check_kernel_sections_mem();
>> 672
>> 673 early_init_fdt_reserve_self();
>> 674 early_init_fdt_scan_reserved_mem();
>> 675
>> 676 #ifndef CONFIG_NUMA
>> 677 memblock_set_node(0, PHYS_ADDR_MAX, &memblock.memory, 0);
>> 678 #endif
>> 679 bootmem_init();
>> 680
>> 681 /*
>> 682 * Prevent memblock from allocating high memory.
>> 683 * This cannot be done before max_low_pfn is detected, so up
>> 684 * to this point is possible to only reserve physical memory
>> 685 * with memblock_reserve; memblock_alloc* can be used
>> 686 * only after this point
>> 687 */
>> 688 memblock_set_current_limit(PFN_PHYS(max_low_pfn));
>> 689
>> 690 #ifdef CONFIG_PROC_VMCORE
>> 691 if (setup_elfcorehdr && setup_elfcorehdr_size) {
>> 692 printk(KERN_INFO "kdump reserved memory at %lx-%lx\n",
>> 693 setup_elfcorehdr, setup_elfcorehdr_size);
>> 694 memblock_reserve(setup_elfcorehdr, setup_elfcorehdr_size);
>> 695 }
>> 696 #endif
>> 697
>> 698 mips_parse_crashkernel();
>> 699 #ifdef CONFIG_KEXEC
>> 700 if (crashk_res.start != crashk_res.end)
>> 701 memblock_reserve(crashk_res.start, resource_size(&crashk_res));
>> 702 #endif
>> 703 device_tree_init();
>> 704 sparse_init();
>> 705 plat_swiotlb_setup();
>> 706
>> 707 dma_contiguous_reserve(PFN_PHYS(max_low_pfn));
>> 708
>> 709 /* Reserve for hibernation. */
>> 710 memblock_reserve(__pa_symbol(&__nosave_begin),
>> 711 __pa_symbol(&__nosave_end) - __pa_symbol(&__nosave_begin));
>> 712
>> 713 fdt_init_reserved_mem();
>> 714
>> 715 memblock_dump_all();
>> 716
>> 717 early_memtest(PFN_PHYS(ARCH_PFN_OFFSET), PFN_PHYS(max_low_pfn));
>> 718 }
>> 719
>> 720 static void __init resource_init(void)
>> 721 {
>> 722 struct memblock_region *region;
>> 723
>> 724 if (UNCAC_BASE != IO_BASE)
>> 725 return;
>> 726
>> 727 code_resource.start = __pa_symbol(&_text);
>> 728 code_resource.end = __pa_symbol(&_etext) - 1;
>> 729 data_resource.start = __pa_symbol(&_etext);
>> 730 data_resource.end = __pa_symbol(&_edata) - 1;
>> 731 bss_resource.start = __pa_symbol(&__bss_start);
>> 732 bss_resource.end = __pa_symbol(&__bss_stop) - 1;
>> 733
>> 734 for_each_memblock(memory, region) {
>> 735 phys_addr_t start = PFN_PHYS(memblock_region_memory_base_pfn(region));
>> 736 phys_addr_t end = PFN_PHYS(memblock_region_memory_end_pfn(region)) - 1;
>> 737 struct resource *res;
>> 738
>> 739 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES);
>> 740 if (!res)
>> 741 panic("%s: Failed to allocate %zu bytes\n", __func__,
>> 742 sizeof(struct resource));
>> 743
>> 744 res->start = start;
>> 745 res->end = end;
>> 746 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
>> 747 res->name = "System RAM";
>> 748
>> 749 request_resource(&iomem_resource, res);
>> 750
>> 751 /*
>> 752 * We don't know which RAM region contains kernel data,
>> 753 * so we try it repeatedly and let the resource manager
>> 754 * test it.
>> 755 */
>> 756 request_resource(res, &code_resource);
>> 757 request_resource(res, &data_resource);
>> 758 request_resource(res, &bss_resource);
>> 759 request_crashkernel(res);
>> 760 }
>> 761 }
>> 762
>> 763 #ifdef CONFIG_SMP
>> 764 static void __init prefill_possible_map(void)
>> 765 {
>> 766 int i, possible = num_possible_cpus();
>> 767
>> 768 if (possible > nr_cpu_ids)
>> 769 possible = nr_cpu_ids;
>> 770
>> 771 for (i = 0; i < possible; i++)
>> 772 set_cpu_possible(i, true);
>> 773 for (; i < NR_CPUS; i++)
>> 774 set_cpu_possible(i, false);
>> 775
>> 776 nr_cpu_ids = possible;
>> 777 }
4 #else 778 #else
5 #include "setup_no.c" !! 779 static inline void prefill_possible_map(void) {}
>> 780 #endif
>> 781
>> 782 void __init setup_arch(char **cmdline_p)
>> 783 {
>> 784 cpu_probe();
>> 785 mips_cm_probe();
>> 786 prom_init();
>> 787
>> 788 setup_early_fdc_console();
>> 789 #ifdef CONFIG_EARLY_PRINTK
>> 790 setup_early_printk();
>> 791 #endif
>> 792 cpu_report();
>> 793 check_bugs_early();
>> 794
>> 795 #if defined(CONFIG_VT)
>> 796 #if defined(CONFIG_VGA_CONSOLE)
>> 797 conswitchp = &vga_con;
>> 798 #endif
6 #endif 799 #endif
7 800
8 #if IS_ENABLED(CONFIG_INPUT_M68K_BEEP) !! 801 arch_mem_init(cmdline_p);
9 void (*mach_beep)(unsigned int, unsigned int); !! 802
10 EXPORT_SYMBOL(mach_beep); !! 803 resource_init();
>> 804 plat_smp_setup();
>> 805 prefill_possible_map();
>> 806
>> 807 cpu_cache_init();
>> 808 paging_init();
>> 809 }
>> 810
>> 811 unsigned long kernelsp[NR_CPUS];
>> 812 unsigned long fw_arg0, fw_arg1, fw_arg2, fw_arg3;
>> 813
>> 814 #ifdef CONFIG_USE_OF
>> 815 unsigned long fw_passed_dtb;
>> 816 #endif
>> 817
>> 818 #ifdef CONFIG_DEBUG_FS
>> 819 struct dentry *mips_debugfs_dir;
>> 820 static int __init debugfs_mips(void)
>> 821 {
>> 822 mips_debugfs_dir = debugfs_create_dir("mips", NULL);
>> 823 return 0;
>> 824 }
>> 825 arch_initcall(debugfs_mips);
>> 826 #endif
>> 827
>> 828 #ifdef CONFIG_DMA_MAYBE_COHERENT
>> 829 /* User defined DMA coherency from command line. */
>> 830 enum coherent_io_user_state coherentio = IO_COHERENCE_DEFAULT;
>> 831 EXPORT_SYMBOL_GPL(coherentio);
>> 832 int hw_coherentio = 0; /* Actual hardware supported DMA coherency setting. */
>> 833
>> 834 static int __init setcoherentio(char *str)
>> 835 {
>> 836 coherentio = IO_COHERENCE_ENABLED;
>> 837 pr_info("Hardware DMA cache coherency (command line)\n");
>> 838 return 0;
>> 839 }
>> 840 early_param("coherentio", setcoherentio);
>> 841
>> 842 static int __init setnocoherentio(char *str)
>> 843 {
>> 844 coherentio = IO_COHERENCE_DISABLED;
>> 845 pr_info("Software DMA cache coherency (command line)\n");
>> 846 return 0;
>> 847 }
>> 848 early_param("nocoherentio", setnocoherentio);
11 #endif 849 #endif
12 850
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