1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Regents of the University of California 4 * Copyright (C) 2019 Western Digital Corporation or its affiliates. 5 */ 6 7 #include <linux/init.h> 8 #include <linux/mm.h> 9 #include <linux/memblock.h> 10 #include <linux/initrd.h> 11 #include <linux/swap.h> 12 #include <linux/sizes.h> 13 #include <linux/of_fdt.h> 14 #include <linux/libfdt.h> 15 #include <linux/set_memory.h> 16 #include <linux/dma-map-ops.h> 17 18 #include <asm/fixmap.h> 19 #include <asm/tlbflush.h> 20 #include <asm/sections.h> 21 #include <asm/soc.h> 22 #include <asm/io.h> 23 #include <asm/ptdump.h> 24 #include <asm/numa.h> 25 26 #include "../kernel/head.h" 27 28 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 29 __page_aligned_bss; 30 EXPORT_SYMBOL(empty_zero_page); 31 32 extern char _start[]; 33 #define DTB_EARLY_BASE_VA PGDIR_SIZE 34 void *dtb_early_va __initdata; 35 uintptr_t dtb_early_pa __initdata; 36 37 struct pt_alloc_ops { 38 pte_t *(*get_pte_virt)(phys_addr_t pa); 39 phys_addr_t (*alloc_pte)(uintptr_t va); 40 #ifndef __PAGETABLE_PMD_FOLDED 41 pmd_t *(*get_pmd_virt)(phys_addr_t pa); 42 phys_addr_t (*alloc_pmd)(uintptr_t va); 43 #endif 44 }; 45 46 static phys_addr_t dma32_phys_limit __ro_after_init; 47 48 static void __init zone_sizes_init(void) 49 { 50 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 51 52 #ifdef CONFIG_ZONE_DMA32 53 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); 54 #endif 55 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 56 57 free_area_init(max_zone_pfns); 58 } 59 60 static void setup_zero_page(void) 61 { 62 memset((void *)empty_zero_page, 0, PAGE_SIZE); 63 } 64 65 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 66 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 67 { 68 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 69 (((t) - (b)) >> 10)); 70 } 71 72 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 73 { 74 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 75 (((t) - (b)) >> 20)); 76 } 77 78 static void print_vm_layout(void) 79 { 80 pr_notice("Virtual kernel memory layout:\n"); 81 print_mlk("fixmap", (unsigned long)FIXADDR_START, 82 (unsigned long)FIXADDR_TOP); 83 print_mlm("pci io", (unsigned long)PCI_IO_START, 84 (unsigned long)PCI_IO_END); 85 print_mlm("vmemmap", (unsigned long)VMEMMAP_START, 86 (unsigned long)VMEMMAP_END); 87 print_mlm("vmalloc", (unsigned long)VMALLOC_START, 88 (unsigned long)VMALLOC_END); 89 print_mlm("lowmem", (unsigned long)PAGE_OFFSET, 90 (unsigned long)high_memory); 91 } 92 #else 93 static void print_vm_layout(void) { } 94 #endif /* CONFIG_DEBUG_VM */ 95 96 void __init mem_init(void) 97 { 98 #ifdef CONFIG_FLATMEM 99 BUG_ON(!mem_map); 100 #endif /* CONFIG_FLATMEM */ 101 102 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 103 memblock_free_all(); 104 105 mem_init_print_info(NULL); 106 print_vm_layout(); 107 } 108 109 void __init setup_bootmem(void) 110 { 111 phys_addr_t mem_start = 0; 112 phys_addr_t start, dram_end, end = 0; 113 phys_addr_t vmlinux_end = __pa_symbol(&_end); 114 phys_addr_t vmlinux_start = __pa_symbol(&_start); 115 phys_addr_t max_mapped_addr = __pa(~(ulong)0); 116 u64 i; 117 118 /* Find the memory region containing the kernel */ 119 for_each_mem_range(i, &start, &end) { 120 phys_addr_t size = end - start; 121 if (!mem_start) 122 mem_start = start; 123 if (start <= vmlinux_start && vmlinux_end <= end) 124 BUG_ON(size == 0); 125 } 126 127 /* 128 * The maximal physical memory size is -PAGE_OFFSET. 129 * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed 130 * as it is unusable by kernel. 131 */ 132 memblock_enforce_memory_limit(-PAGE_OFFSET); 133 134 /* Reserve from the start of the kernel to the end of the kernel */ 135 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 136 137 dram_end = memblock_end_of_DRAM(); 138 139 /* 140 * memblock allocator is not aware of the fact that last 4K bytes of 141 * the addressable memory can not be mapped because of IS_ERR_VALUE 142 * macro. Make sure that last 4k bytes are not usable by memblock 143 * if end of dram is equal to maximum addressable memory. 144 */ 145 if (max_mapped_addr == (dram_end - 1)) 146 memblock_set_current_limit(max_mapped_addr - 4096); 147 148 max_pfn = PFN_DOWN(dram_end); 149 max_low_pfn = max_pfn; 150 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 151 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); 152 153 reserve_initrd_mem(); 154 /* 155 * If DTB is built in, no need to reserve its memblock. 156 * Otherwise, do reserve it but avoid using 157 * early_init_fdt_reserve_self() since __pa() does 158 * not work for DTB pointers that are fixmap addresses 159 */ 160 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) 161 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 162 163 early_init_fdt_scan_reserved_mem(); 164 dma_contiguous_reserve(dma32_phys_limit); 165 memblock_allow_resize(); 166 } 167 168 #ifdef CONFIG_MMU 169 static struct pt_alloc_ops pt_ops; 170 171 unsigned long va_pa_offset; 172 EXPORT_SYMBOL(va_pa_offset); 173 unsigned long pfn_base; 174 EXPORT_SYMBOL(pfn_base); 175 176 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 177 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 178 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 179 180 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 181 182 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 183 { 184 unsigned long addr = __fix_to_virt(idx); 185 pte_t *ptep; 186 187 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 188 189 ptep = &fixmap_pte[pte_index(addr)]; 190 191 if (pgprot_val(prot)) 192 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 193 else 194 pte_clear(&init_mm, addr, ptep); 195 local_flush_tlb_page(addr); 196 } 197 198 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 199 { 200 return (pte_t *)((uintptr_t)pa); 201 } 202 203 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 204 { 205 clear_fixmap(FIX_PTE); 206 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 207 } 208 209 static inline pte_t *get_pte_virt_late(phys_addr_t pa) 210 { 211 return (pte_t *) __va(pa); 212 } 213 214 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 215 { 216 /* 217 * We only create PMD or PGD early mappings so we 218 * should never reach here with MMU disabled. 219 */ 220 BUG(); 221 } 222 223 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 224 { 225 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 226 } 227 228 static phys_addr_t alloc_pte_late(uintptr_t va) 229 { 230 unsigned long vaddr; 231 232 vaddr = __get_free_page(GFP_KERNEL); 233 if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr))) 234 BUG(); 235 return __pa(vaddr); 236 } 237 238 static void __init create_pte_mapping(pte_t *ptep, 239 uintptr_t va, phys_addr_t pa, 240 phys_addr_t sz, pgprot_t prot) 241 { 242 uintptr_t pte_idx = pte_index(va); 243 244 BUG_ON(sz != PAGE_SIZE); 245 246 if (pte_none(ptep[pte_idx])) 247 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 248 } 249 250 #ifndef __PAGETABLE_PMD_FOLDED 251 252 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 253 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 254 pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 255 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 256 257 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 258 { 259 /* Before MMU is enabled */ 260 return (pmd_t *)((uintptr_t)pa); 261 } 262 263 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 264 { 265 clear_fixmap(FIX_PMD); 266 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 267 } 268 269 static pmd_t *get_pmd_virt_late(phys_addr_t pa) 270 { 271 return (pmd_t *) __va(pa); 272 } 273 274 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 275 { 276 BUG_ON((va - PAGE_OFFSET) >> PGDIR_SHIFT); 277 278 return (uintptr_t)early_pmd; 279 } 280 281 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 282 { 283 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 284 } 285 286 static phys_addr_t alloc_pmd_late(uintptr_t va) 287 { 288 unsigned long vaddr; 289 290 vaddr = __get_free_page(GFP_KERNEL); 291 BUG_ON(!vaddr); 292 return __pa(vaddr); 293 } 294 295 static void __init create_pmd_mapping(pmd_t *pmdp, 296 uintptr_t va, phys_addr_t pa, 297 phys_addr_t sz, pgprot_t prot) 298 { 299 pte_t *ptep; 300 phys_addr_t pte_phys; 301 uintptr_t pmd_idx = pmd_index(va); 302 303 if (sz == PMD_SIZE) { 304 if (pmd_none(pmdp[pmd_idx])) 305 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 306 return; 307 } 308 309 if (pmd_none(pmdp[pmd_idx])) { 310 pte_phys = pt_ops.alloc_pte(va); 311 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 312 ptep = pt_ops.get_pte_virt(pte_phys); 313 memset(ptep, 0, PAGE_SIZE); 314 } else { 315 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 316 ptep = pt_ops.get_pte_virt(pte_phys); 317 } 318 319 create_pte_mapping(ptep, va, pa, sz, prot); 320 } 321 322 #define pgd_next_t pmd_t 323 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va) 324 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa) 325 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 326 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot) 327 #define fixmap_pgd_next fixmap_pmd 328 #else 329 #define pgd_next_t pte_t 330 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 331 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 332 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 333 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 334 #define fixmap_pgd_next fixmap_pte 335 #endif 336 337 void __init create_pgd_mapping(pgd_t *pgdp, 338 uintptr_t va, phys_addr_t pa, 339 phys_addr_t sz, pgprot_t prot) 340 { 341 pgd_next_t *nextp; 342 phys_addr_t next_phys; 343 uintptr_t pgd_idx = pgd_index(va); 344 345 if (sz == PGDIR_SIZE) { 346 if (pgd_val(pgdp[pgd_idx]) == 0) 347 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 348 return; 349 } 350 351 if (pgd_val(pgdp[pgd_idx]) == 0) { 352 next_phys = alloc_pgd_next(va); 353 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 354 nextp = get_pgd_next_virt(next_phys); 355 memset(nextp, 0, PAGE_SIZE); 356 } else { 357 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 358 nextp = get_pgd_next_virt(next_phys); 359 } 360 361 create_pgd_next_mapping(nextp, va, pa, sz, prot); 362 } 363 364 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 365 { 366 /* Upgrade to PMD_SIZE mappings whenever possible */ 367 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) 368 return PAGE_SIZE; 369 370 return PMD_SIZE; 371 } 372 373 /* 374 * setup_vm() is called from head.S with MMU-off. 375 * 376 * Following requirements should be honoured for setup_vm() to work 377 * correctly: 378 * 1) It should use PC-relative addressing for accessing kernel symbols. 379 * To achieve this we always use GCC cmodel=medany. 380 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 381 * so disable compiler instrumentation when FTRACE is enabled. 382 * 383 * Currently, the above requirements are honoured by using custom CFLAGS 384 * for init.o in mm/Makefile. 385 */ 386 387 #ifndef __riscv_cmodel_medany 388 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 389 #endif 390 391 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 392 { 393 uintptr_t va, pa, end_va; 394 uintptr_t load_pa = (uintptr_t)(&_start); 395 uintptr_t load_sz = (uintptr_t)(&_end) - load_pa; 396 uintptr_t map_size; 397 #ifndef __PAGETABLE_PMD_FOLDED 398 pmd_t fix_bmap_spmd, fix_bmap_epmd; 399 #endif 400 401 va_pa_offset = PAGE_OFFSET - load_pa; 402 pfn_base = PFN_DOWN(load_pa); 403 404 /* 405 * Enforce boot alignment requirements of RV32 and 406 * RV64 by only allowing PMD or PGD mappings. 407 */ 408 map_size = PMD_SIZE; 409 410 /* Sanity check alignment and size */ 411 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 412 BUG_ON((load_pa % map_size) != 0); 413 414 pt_ops.alloc_pte = alloc_pte_early; 415 pt_ops.get_pte_virt = get_pte_virt_early; 416 #ifndef __PAGETABLE_PMD_FOLDED 417 pt_ops.alloc_pmd = alloc_pmd_early; 418 pt_ops.get_pmd_virt = get_pmd_virt_early; 419 #endif 420 /* Setup early PGD for fixmap */ 421 create_pgd_mapping(early_pg_dir, FIXADDR_START, 422 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 423 424 #ifndef __PAGETABLE_PMD_FOLDED 425 /* Setup fixmap PMD */ 426 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 427 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 428 /* Setup trampoline PGD and PMD */ 429 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 430 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE); 431 create_pmd_mapping(trampoline_pmd, PAGE_OFFSET, 432 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC); 433 #else 434 /* Setup trampoline PGD */ 435 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 436 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC); 437 #endif 438 439 /* 440 * Setup early PGD covering entire kernel which will allows 441 * us to reach paging_init(). We map all memory banks later 442 * in setup_vm_final() below. 443 */ 444 end_va = PAGE_OFFSET + load_sz; 445 for (va = PAGE_OFFSET; va < end_va; va += map_size) 446 create_pgd_mapping(early_pg_dir, va, 447 load_pa + (va - PAGE_OFFSET), 448 map_size, PAGE_KERNEL_EXEC); 449 450 #ifndef __PAGETABLE_PMD_FOLDED 451 /* Setup early PMD for DTB */ 452 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 453 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE); 454 #ifndef CONFIG_BUILTIN_DTB 455 /* Create two consecutive PMD mappings for FDT early scan */ 456 pa = dtb_pa & ~(PMD_SIZE - 1); 457 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA, 458 pa, PMD_SIZE, PAGE_KERNEL); 459 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE, 460 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 461 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1)); 462 #else /* CONFIG_BUILTIN_DTB */ 463 dtb_early_va = __va(dtb_pa); 464 #endif /* CONFIG_BUILTIN_DTB */ 465 #else 466 #ifndef CONFIG_BUILTIN_DTB 467 /* Create two consecutive PGD mappings for FDT early scan */ 468 pa = dtb_pa & ~(PGDIR_SIZE - 1); 469 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 470 pa, PGDIR_SIZE, PAGE_KERNEL); 471 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE, 472 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL); 473 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1)); 474 #else /* CONFIG_BUILTIN_DTB */ 475 dtb_early_va = __va(dtb_pa); 476 #endif /* CONFIG_BUILTIN_DTB */ 477 #endif 478 dtb_early_pa = dtb_pa; 479 480 /* 481 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 482 * range can not span multiple pmds. 483 */ 484 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 485 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 486 487 #ifndef __PAGETABLE_PMD_FOLDED 488 /* 489 * Early ioremap fixmap is already created as it lies within first 2MB 490 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 491 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 492 * the user if not. 493 */ 494 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 495 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 496 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 497 WARN_ON(1); 498 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 499 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 500 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 501 fix_to_virt(FIX_BTMAP_BEGIN)); 502 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 503 fix_to_virt(FIX_BTMAP_END)); 504 505 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 506 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 507 } 508 #endif 509 } 510 511 static void __init setup_vm_final(void) 512 { 513 uintptr_t va, map_size; 514 phys_addr_t pa, start, end; 515 u64 i; 516 517 /** 518 * MMU is enabled at this point. But page table setup is not complete yet. 519 * fixmap page table alloc functions should be used at this point 520 */ 521 pt_ops.alloc_pte = alloc_pte_fixmap; 522 pt_ops.get_pte_virt = get_pte_virt_fixmap; 523 #ifndef __PAGETABLE_PMD_FOLDED 524 pt_ops.alloc_pmd = alloc_pmd_fixmap; 525 pt_ops.get_pmd_virt = get_pmd_virt_fixmap; 526 #endif 527 /* Setup swapper PGD for fixmap */ 528 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 529 __pa_symbol(fixmap_pgd_next), 530 PGDIR_SIZE, PAGE_TABLE); 531 532 /* Map all memory banks */ 533 for_each_mem_range(i, &start, &end) { 534 if (start >= end) 535 break; 536 if (start <= __pa(PAGE_OFFSET) && 537 __pa(PAGE_OFFSET) < end) 538 start = __pa(PAGE_OFFSET); 539 540 map_size = best_map_size(start, end - start); 541 for (pa = start; pa < end; pa += map_size) { 542 va = (uintptr_t)__va(pa); 543 create_pgd_mapping(swapper_pg_dir, va, pa, 544 map_size, PAGE_KERNEL_EXEC); 545 } 546 } 547 548 /* Clear fixmap PTE and PMD mappings */ 549 clear_fixmap(FIX_PTE); 550 clear_fixmap(FIX_PMD); 551 552 /* Move to swapper page table */ 553 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE); 554 local_flush_tlb_all(); 555 556 /* generic page allocation functions must be used to setup page table */ 557 pt_ops.alloc_pte = alloc_pte_late; 558 pt_ops.get_pte_virt = get_pte_virt_late; 559 #ifndef __PAGETABLE_PMD_FOLDED 560 pt_ops.alloc_pmd = alloc_pmd_late; 561 pt_ops.get_pmd_virt = get_pmd_virt_late; 562 #endif 563 } 564 #else 565 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 566 { 567 dtb_early_va = (void *)dtb_pa; 568 dtb_early_pa = dtb_pa; 569 } 570 571 static inline void setup_vm_final(void) 572 { 573 } 574 #endif /* CONFIG_MMU */ 575 576 #ifdef CONFIG_STRICT_KERNEL_RWX 577 void protect_kernel_text_data(void) 578 { 579 unsigned long text_start = (unsigned long)_start; 580 unsigned long init_text_start = (unsigned long)__init_text_begin; 581 unsigned long init_data_start = (unsigned long)__init_data_begin; 582 unsigned long rodata_start = (unsigned long)__start_rodata; 583 unsigned long data_start = (unsigned long)_data; 584 unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn))); 585 586 set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT); 587 set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT); 588 set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT); 589 /* rodata section is marked readonly in mark_rodata_ro */ 590 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 591 set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT); 592 } 593 594 void mark_rodata_ro(void) 595 { 596 unsigned long rodata_start = (unsigned long)__start_rodata; 597 unsigned long data_start = (unsigned long)_data; 598 599 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 600 601 debug_checkwx(); 602 } 603 #endif 604 605 void __init paging_init(void) 606 { 607 setup_vm_final(); 608 setup_zero_page(); 609 } 610 611 void __init misc_mem_init(void) 612 { 613 arch_numa_init(); 614 sparse_init(); 615 zone_sizes_init(); 616 memblock_dump_all(); 617 } 618 619 #ifdef CONFIG_SPARSEMEM_VMEMMAP 620 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 621 struct vmem_altmap *altmap) 622 { 623 return vmemmap_populate_basepages(start, end, node, NULL); 624 } 625 #endif 626