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