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 17 #include <asm/fixmap.h> 18 #include <asm/tlbflush.h> 19 #include <asm/sections.h> 20 #include <asm/soc.h> 21 #include <asm/io.h> 22 #include <asm/ptdump.h> 23 24 #include "../kernel/head.h" 25 26 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 27 __page_aligned_bss; 28 EXPORT_SYMBOL(empty_zero_page); 29 30 extern char _start[]; 31 #define DTB_EARLY_BASE_VA PGDIR_SIZE 32 void *dtb_early_va __initdata; 33 uintptr_t dtb_early_pa __initdata; 34 35 struct pt_alloc_ops { 36 pte_t *(*get_pte_virt)(phys_addr_t pa); 37 phys_addr_t (*alloc_pte)(uintptr_t va); 38 #ifndef __PAGETABLE_PMD_FOLDED 39 pmd_t *(*get_pmd_virt)(phys_addr_t pa); 40 phys_addr_t (*alloc_pmd)(uintptr_t va); 41 #endif 42 }; 43 44 static void __init zone_sizes_init(void) 45 { 46 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 47 48 #ifdef CONFIG_ZONE_DMA32 49 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(min(4UL * SZ_1G, 50 (unsigned long) PFN_PHYS(max_low_pfn))); 51 #endif 52 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 53 54 free_area_init(max_zone_pfns); 55 } 56 57 static void setup_zero_page(void) 58 { 59 memset((void *)empty_zero_page, 0, PAGE_SIZE); 60 } 61 62 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 63 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 64 { 65 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 66 (((t) - (b)) >> 10)); 67 } 68 69 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 70 { 71 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 72 (((t) - (b)) >> 20)); 73 } 74 75 static void print_vm_layout(void) 76 { 77 pr_notice("Virtual kernel memory layout:\n"); 78 print_mlk("fixmap", (unsigned long)FIXADDR_START, 79 (unsigned long)FIXADDR_TOP); 80 print_mlm("pci io", (unsigned long)PCI_IO_START, 81 (unsigned long)PCI_IO_END); 82 print_mlm("vmemmap", (unsigned long)VMEMMAP_START, 83 (unsigned long)VMEMMAP_END); 84 print_mlm("vmalloc", (unsigned long)VMALLOC_START, 85 (unsigned long)VMALLOC_END); 86 print_mlm("lowmem", (unsigned long)PAGE_OFFSET, 87 (unsigned long)high_memory); 88 } 89 #else 90 static void print_vm_layout(void) { } 91 #endif /* CONFIG_DEBUG_VM */ 92 93 void __init mem_init(void) 94 { 95 #ifdef CONFIG_FLATMEM 96 BUG_ON(!mem_map); 97 #endif /* CONFIG_FLATMEM */ 98 99 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 100 memblock_free_all(); 101 102 mem_init_print_info(NULL); 103 print_vm_layout(); 104 } 105 106 #ifdef CONFIG_BLK_DEV_INITRD 107 static void __init setup_initrd(void) 108 { 109 phys_addr_t start; 110 unsigned long size; 111 112 /* Ignore the virtul address computed during device tree parsing */ 113 initrd_start = initrd_end = 0; 114 115 if (!phys_initrd_size) 116 return; 117 /* 118 * Round the memory region to page boundaries as per free_initrd_mem() 119 * This allows us to detect whether the pages overlapping the initrd 120 * are in use, but more importantly, reserves the entire set of pages 121 * as we don't want these pages allocated for other purposes. 122 */ 123 start = round_down(phys_initrd_start, PAGE_SIZE); 124 size = phys_initrd_size + (phys_initrd_start - start); 125 size = round_up(size, PAGE_SIZE); 126 127 if (!memblock_is_region_memory(start, size)) { 128 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region", 129 (u64)start, size); 130 goto disable; 131 } 132 133 if (memblock_is_region_reserved(start, size)) { 134 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n", 135 (u64)start, size); 136 goto disable; 137 } 138 139 memblock_reserve(start, size); 140 /* Now convert initrd to virtual addresses */ 141 initrd_start = (unsigned long)__va(phys_initrd_start); 142 initrd_end = initrd_start + phys_initrd_size; 143 initrd_below_start_ok = 1; 144 145 pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n", 146 (void *)(initrd_start), size); 147 return; 148 disable: 149 pr_cont(" - disabling initrd\n"); 150 initrd_start = 0; 151 initrd_end = 0; 152 } 153 #endif /* CONFIG_BLK_DEV_INITRD */ 154 155 void __init setup_bootmem(void) 156 { 157 phys_addr_t mem_size = 0; 158 phys_addr_t total_mem = 0; 159 phys_addr_t mem_start, start, end = 0; 160 phys_addr_t vmlinux_end = __pa_symbol(&_end); 161 phys_addr_t vmlinux_start = __pa_symbol(&_start); 162 u64 i; 163 164 /* Find the memory region containing the kernel */ 165 for_each_mem_range(i, &start, &end) { 166 phys_addr_t size = end - start; 167 if (!total_mem) 168 mem_start = start; 169 if (start <= vmlinux_start && vmlinux_end <= end) 170 BUG_ON(size == 0); 171 total_mem = total_mem + size; 172 } 173 174 /* 175 * Remove memblock from the end of usable area to the 176 * end of region 177 */ 178 mem_size = min(total_mem, (phys_addr_t)-PAGE_OFFSET); 179 if (mem_start + mem_size < end) 180 memblock_remove(mem_start + mem_size, 181 end - mem_start - mem_size); 182 183 /* Reserve from the start of the kernel to the end of the kernel */ 184 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 185 186 max_pfn = PFN_DOWN(memblock_end_of_DRAM()); 187 max_low_pfn = max_pfn; 188 set_max_mapnr(max_low_pfn); 189 190 #ifdef CONFIG_BLK_DEV_INITRD 191 setup_initrd(); 192 #endif /* CONFIG_BLK_DEV_INITRD */ 193 194 /* 195 * Avoid using early_init_fdt_reserve_self() since __pa() does 196 * not work for DTB pointers that are fixmap addresses 197 */ 198 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 199 200 early_init_fdt_scan_reserved_mem(); 201 memblock_allow_resize(); 202 memblock_dump_all(); 203 } 204 205 #ifdef CONFIG_MMU 206 static struct pt_alloc_ops pt_ops; 207 208 unsigned long va_pa_offset; 209 EXPORT_SYMBOL(va_pa_offset); 210 unsigned long pfn_base; 211 EXPORT_SYMBOL(pfn_base); 212 213 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 214 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 215 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 216 217 #define MAX_EARLY_MAPPING_SIZE SZ_128M 218 219 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 220 221 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 222 { 223 unsigned long addr = __fix_to_virt(idx); 224 pte_t *ptep; 225 226 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 227 228 ptep = &fixmap_pte[pte_index(addr)]; 229 230 if (pgprot_val(prot)) 231 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 232 else 233 pte_clear(&init_mm, addr, ptep); 234 local_flush_tlb_page(addr); 235 } 236 237 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 238 { 239 return (pte_t *)((uintptr_t)pa); 240 } 241 242 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 243 { 244 clear_fixmap(FIX_PTE); 245 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 246 } 247 248 static inline pte_t *get_pte_virt_late(phys_addr_t pa) 249 { 250 return (pte_t *) __va(pa); 251 } 252 253 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 254 { 255 /* 256 * We only create PMD or PGD early mappings so we 257 * should never reach here with MMU disabled. 258 */ 259 BUG(); 260 } 261 262 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 263 { 264 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 265 } 266 267 static phys_addr_t alloc_pte_late(uintptr_t va) 268 { 269 unsigned long vaddr; 270 271 vaddr = __get_free_page(GFP_KERNEL); 272 if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr))) 273 BUG(); 274 return __pa(vaddr); 275 } 276 277 static void __init create_pte_mapping(pte_t *ptep, 278 uintptr_t va, phys_addr_t pa, 279 phys_addr_t sz, pgprot_t prot) 280 { 281 uintptr_t pte_idx = pte_index(va); 282 283 BUG_ON(sz != PAGE_SIZE); 284 285 if (pte_none(ptep[pte_idx])) 286 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 287 } 288 289 #ifndef __PAGETABLE_PMD_FOLDED 290 291 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 292 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 293 294 #if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE 295 #define NUM_EARLY_PMDS 1UL 296 #else 297 #define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE) 298 #endif 299 pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE); 300 301 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 302 { 303 /* Before MMU is enabled */ 304 return (pmd_t *)((uintptr_t)pa); 305 } 306 307 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 308 { 309 clear_fixmap(FIX_PMD); 310 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 311 } 312 313 static pmd_t *get_pmd_virt_late(phys_addr_t pa) 314 { 315 return (pmd_t *) __va(pa); 316 } 317 318 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 319 { 320 uintptr_t pmd_num; 321 322 pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT; 323 BUG_ON(pmd_num >= NUM_EARLY_PMDS); 324 return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD]; 325 } 326 327 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 328 { 329 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 330 } 331 332 static phys_addr_t alloc_pmd_late(uintptr_t va) 333 { 334 unsigned long vaddr; 335 336 vaddr = __get_free_page(GFP_KERNEL); 337 BUG_ON(!vaddr); 338 return __pa(vaddr); 339 } 340 341 static void __init create_pmd_mapping(pmd_t *pmdp, 342 uintptr_t va, phys_addr_t pa, 343 phys_addr_t sz, pgprot_t prot) 344 { 345 pte_t *ptep; 346 phys_addr_t pte_phys; 347 uintptr_t pmd_idx = pmd_index(va); 348 349 if (sz == PMD_SIZE) { 350 if (pmd_none(pmdp[pmd_idx])) 351 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 352 return; 353 } 354 355 if (pmd_none(pmdp[pmd_idx])) { 356 pte_phys = pt_ops.alloc_pte(va); 357 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 358 ptep = pt_ops.get_pte_virt(pte_phys); 359 memset(ptep, 0, PAGE_SIZE); 360 } else { 361 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 362 ptep = pt_ops.get_pte_virt(pte_phys); 363 } 364 365 create_pte_mapping(ptep, va, pa, sz, prot); 366 } 367 368 #define pgd_next_t pmd_t 369 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va) 370 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa) 371 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 372 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot) 373 #define fixmap_pgd_next fixmap_pmd 374 #else 375 #define pgd_next_t pte_t 376 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 377 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 378 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 379 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 380 #define fixmap_pgd_next fixmap_pte 381 #endif 382 383 void __init create_pgd_mapping(pgd_t *pgdp, 384 uintptr_t va, phys_addr_t pa, 385 phys_addr_t sz, pgprot_t prot) 386 { 387 pgd_next_t *nextp; 388 phys_addr_t next_phys; 389 uintptr_t pgd_idx = pgd_index(va); 390 391 if (sz == PGDIR_SIZE) { 392 if (pgd_val(pgdp[pgd_idx]) == 0) 393 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 394 return; 395 } 396 397 if (pgd_val(pgdp[pgd_idx]) == 0) { 398 next_phys = alloc_pgd_next(va); 399 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 400 nextp = get_pgd_next_virt(next_phys); 401 memset(nextp, 0, PAGE_SIZE); 402 } else { 403 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 404 nextp = get_pgd_next_virt(next_phys); 405 } 406 407 create_pgd_next_mapping(nextp, va, pa, sz, prot); 408 } 409 410 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 411 { 412 /* Upgrade to PMD_SIZE mappings whenever possible */ 413 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) 414 return PAGE_SIZE; 415 416 return PMD_SIZE; 417 } 418 419 /* 420 * setup_vm() is called from head.S with MMU-off. 421 * 422 * Following requirements should be honoured for setup_vm() to work 423 * correctly: 424 * 1) It should use PC-relative addressing for accessing kernel symbols. 425 * To achieve this we always use GCC cmodel=medany. 426 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 427 * so disable compiler instrumentation when FTRACE is enabled. 428 * 429 * Currently, the above requirements are honoured by using custom CFLAGS 430 * for init.o in mm/Makefile. 431 */ 432 433 #ifndef __riscv_cmodel_medany 434 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 435 #endif 436 437 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 438 { 439 uintptr_t va, pa, end_va; 440 uintptr_t load_pa = (uintptr_t)(&_start); 441 uintptr_t load_sz = (uintptr_t)(&_end) - load_pa; 442 uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE); 443 #ifndef __PAGETABLE_PMD_FOLDED 444 pmd_t fix_bmap_spmd, fix_bmap_epmd; 445 #endif 446 447 va_pa_offset = PAGE_OFFSET - load_pa; 448 pfn_base = PFN_DOWN(load_pa); 449 450 /* 451 * Enforce boot alignment requirements of RV32 and 452 * RV64 by only allowing PMD or PGD mappings. 453 */ 454 BUG_ON(map_size == PAGE_SIZE); 455 456 /* Sanity check alignment and size */ 457 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 458 BUG_ON((load_pa % map_size) != 0); 459 BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE); 460 461 pt_ops.alloc_pte = alloc_pte_early; 462 pt_ops.get_pte_virt = get_pte_virt_early; 463 #ifndef __PAGETABLE_PMD_FOLDED 464 pt_ops.alloc_pmd = alloc_pmd_early; 465 pt_ops.get_pmd_virt = get_pmd_virt_early; 466 #endif 467 /* Setup early PGD for fixmap */ 468 create_pgd_mapping(early_pg_dir, FIXADDR_START, 469 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 470 471 #ifndef __PAGETABLE_PMD_FOLDED 472 /* Setup fixmap PMD */ 473 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 474 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 475 /* Setup trampoline PGD and PMD */ 476 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 477 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE); 478 create_pmd_mapping(trampoline_pmd, PAGE_OFFSET, 479 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC); 480 #else 481 /* Setup trampoline PGD */ 482 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 483 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC); 484 #endif 485 486 /* 487 * Setup early PGD covering entire kernel which will allows 488 * us to reach paging_init(). We map all memory banks later 489 * in setup_vm_final() below. 490 */ 491 end_va = PAGE_OFFSET + load_sz; 492 for (va = PAGE_OFFSET; va < end_va; va += map_size) 493 create_pgd_mapping(early_pg_dir, va, 494 load_pa + (va - PAGE_OFFSET), 495 map_size, PAGE_KERNEL_EXEC); 496 497 /* Create two consecutive PGD mappings for FDT early scan */ 498 pa = dtb_pa & ~(PGDIR_SIZE - 1); 499 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 500 pa, PGDIR_SIZE, PAGE_KERNEL); 501 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE, 502 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL); 503 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1)); 504 dtb_early_pa = dtb_pa; 505 506 /* 507 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 508 * range can not span multiple pmds. 509 */ 510 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 511 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 512 513 #ifndef __PAGETABLE_PMD_FOLDED 514 /* 515 * Early ioremap fixmap is already created as it lies within first 2MB 516 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 517 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 518 * the user if not. 519 */ 520 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 521 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 522 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 523 WARN_ON(1); 524 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 525 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 526 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 527 fix_to_virt(FIX_BTMAP_BEGIN)); 528 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 529 fix_to_virt(FIX_BTMAP_END)); 530 531 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 532 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 533 } 534 #endif 535 } 536 537 static void __init setup_vm_final(void) 538 { 539 uintptr_t va, map_size; 540 phys_addr_t pa, start, end; 541 u64 i; 542 543 /** 544 * MMU is enabled at this point. But page table setup is not complete yet. 545 * fixmap page table alloc functions should be used at this point 546 */ 547 pt_ops.alloc_pte = alloc_pte_fixmap; 548 pt_ops.get_pte_virt = get_pte_virt_fixmap; 549 #ifndef __PAGETABLE_PMD_FOLDED 550 pt_ops.alloc_pmd = alloc_pmd_fixmap; 551 pt_ops.get_pmd_virt = get_pmd_virt_fixmap; 552 #endif 553 /* Setup swapper PGD for fixmap */ 554 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 555 __pa_symbol(fixmap_pgd_next), 556 PGDIR_SIZE, PAGE_TABLE); 557 558 /* Map all memory banks */ 559 for_each_mem_range(i, &start, &end) { 560 if (start >= end) 561 break; 562 if (start <= __pa(PAGE_OFFSET) && 563 __pa(PAGE_OFFSET) < end) 564 start = __pa(PAGE_OFFSET); 565 566 map_size = best_map_size(start, end - start); 567 for (pa = start; pa < end; pa += map_size) { 568 va = (uintptr_t)__va(pa); 569 create_pgd_mapping(swapper_pg_dir, va, pa, 570 map_size, PAGE_KERNEL_EXEC); 571 } 572 } 573 574 /* Clear fixmap PTE and PMD mappings */ 575 clear_fixmap(FIX_PTE); 576 clear_fixmap(FIX_PMD); 577 578 /* Move to swapper page table */ 579 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE); 580 local_flush_tlb_all(); 581 582 /* generic page allocation functions must be used to setup page table */ 583 pt_ops.alloc_pte = alloc_pte_late; 584 pt_ops.get_pte_virt = get_pte_virt_late; 585 #ifndef __PAGETABLE_PMD_FOLDED 586 pt_ops.alloc_pmd = alloc_pmd_late; 587 pt_ops.get_pmd_virt = get_pmd_virt_late; 588 #endif 589 } 590 #else 591 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 592 { 593 #ifdef CONFIG_BUILTIN_DTB 594 dtb_early_va = soc_lookup_builtin_dtb(); 595 if (!dtb_early_va) { 596 /* Fallback to first available DTS */ 597 dtb_early_va = (void *) __dtb_start; 598 } 599 #else 600 dtb_early_va = (void *)dtb_pa; 601 #endif 602 dtb_early_pa = dtb_pa; 603 } 604 605 static inline void setup_vm_final(void) 606 { 607 } 608 #endif /* CONFIG_MMU */ 609 610 #ifdef CONFIG_STRICT_KERNEL_RWX 611 void mark_rodata_ro(void) 612 { 613 unsigned long text_start = (unsigned long)_text; 614 unsigned long text_end = (unsigned long)_etext; 615 unsigned long rodata_start = (unsigned long)__start_rodata; 616 unsigned long data_start = (unsigned long)_data; 617 unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn))); 618 619 set_memory_ro(text_start, (text_end - text_start) >> PAGE_SHIFT); 620 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 621 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 622 set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT); 623 624 debug_checkwx(); 625 } 626 #endif 627 628 static void __init resource_init(void) 629 { 630 struct memblock_region *region; 631 632 for_each_mem_region(region) { 633 struct resource *res; 634 635 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 636 if (!res) 637 panic("%s: Failed to allocate %zu bytes\n", __func__, 638 sizeof(struct resource)); 639 640 if (memblock_is_nomap(region)) { 641 res->name = "reserved"; 642 res->flags = IORESOURCE_MEM; 643 } else { 644 res->name = "System RAM"; 645 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 646 } 647 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 648 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 649 650 request_resource(&iomem_resource, res); 651 } 652 } 653 654 void __init paging_init(void) 655 { 656 setup_vm_final(); 657 sparse_init(); 658 setup_zero_page(); 659 zone_sizes_init(); 660 resource_init(); 661 } 662 663 #ifdef CONFIG_SPARSEMEM_VMEMMAP 664 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 665 struct vmem_altmap *altmap) 666 { 667 return vmemmap_populate_basepages(start, end, node, NULL); 668 } 669 #endif 670