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