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 25 #include "../kernel/head.h" 26 27 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 28 __page_aligned_bss; 29 EXPORT_SYMBOL(empty_zero_page); 30 31 extern char _start[]; 32 #define DTB_EARLY_BASE_VA PGDIR_SIZE 33 void *dtb_early_va __initdata; 34 uintptr_t dtb_early_pa __initdata; 35 36 struct pt_alloc_ops { 37 pte_t *(*get_pte_virt)(phys_addr_t pa); 38 phys_addr_t (*alloc_pte)(uintptr_t va); 39 #ifndef __PAGETABLE_PMD_FOLDED 40 pmd_t *(*get_pmd_virt)(phys_addr_t pa); 41 phys_addr_t (*alloc_pmd)(uintptr_t va); 42 #endif 43 }; 44 45 static phys_addr_t dma32_phys_limit __ro_after_init; 46 47 static void __init zone_sizes_init(void) 48 { 49 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 50 51 #ifdef CONFIG_ZONE_DMA32 52 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); 53 #endif 54 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 55 56 free_area_init(max_zone_pfns); 57 } 58 59 static void setup_zero_page(void) 60 { 61 memset((void *)empty_zero_page, 0, PAGE_SIZE); 62 } 63 64 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 65 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 66 { 67 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 68 (((t) - (b)) >> 10)); 69 } 70 71 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 72 { 73 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 74 (((t) - (b)) >> 20)); 75 } 76 77 static void print_vm_layout(void) 78 { 79 pr_notice("Virtual kernel memory layout:\n"); 80 print_mlk("fixmap", (unsigned long)FIXADDR_START, 81 (unsigned long)FIXADDR_TOP); 82 print_mlm("pci io", (unsigned long)PCI_IO_START, 83 (unsigned long)PCI_IO_END); 84 print_mlm("vmemmap", (unsigned long)VMEMMAP_START, 85 (unsigned long)VMEMMAP_END); 86 print_mlm("vmalloc", (unsigned long)VMALLOC_START, 87 (unsigned long)VMALLOC_END); 88 print_mlm("lowmem", (unsigned long)PAGE_OFFSET, 89 (unsigned long)high_memory); 90 } 91 #else 92 static void print_vm_layout(void) { } 93 #endif /* CONFIG_DEBUG_VM */ 94 95 void __init mem_init(void) 96 { 97 #ifdef CONFIG_FLATMEM 98 BUG_ON(!mem_map); 99 #endif /* CONFIG_FLATMEM */ 100 101 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 102 memblock_free_all(); 103 104 mem_init_print_info(NULL); 105 print_vm_layout(); 106 } 107 108 #ifdef CONFIG_BLK_DEV_INITRD 109 static void __init setup_initrd(void) 110 { 111 phys_addr_t start; 112 unsigned long size; 113 114 /* Ignore the virtul address computed during device tree parsing */ 115 initrd_start = initrd_end = 0; 116 117 if (!phys_initrd_size) 118 return; 119 /* 120 * Round the memory region to page boundaries as per free_initrd_mem() 121 * This allows us to detect whether the pages overlapping the initrd 122 * are in use, but more importantly, reserves the entire set of pages 123 * as we don't want these pages allocated for other purposes. 124 */ 125 start = round_down(phys_initrd_start, PAGE_SIZE); 126 size = phys_initrd_size + (phys_initrd_start - start); 127 size = round_up(size, PAGE_SIZE); 128 129 if (!memblock_is_region_memory(start, size)) { 130 pr_err("INITRD: 0x%08llx+0x%08lx is not a memory region", 131 (u64)start, size); 132 goto disable; 133 } 134 135 if (memblock_is_region_reserved(start, size)) { 136 pr_err("INITRD: 0x%08llx+0x%08lx overlaps in-use memory region\n", 137 (u64)start, size); 138 goto disable; 139 } 140 141 memblock_reserve(start, size); 142 /* Now convert initrd to virtual addresses */ 143 initrd_start = (unsigned long)__va(phys_initrd_start); 144 initrd_end = initrd_start + phys_initrd_size; 145 initrd_below_start_ok = 1; 146 147 pr_info("Initial ramdisk at: 0x%p (%lu bytes)\n", 148 (void *)(initrd_start), size); 149 return; 150 disable: 151 pr_cont(" - disabling initrd\n"); 152 initrd_start = 0; 153 initrd_end = 0; 154 } 155 #endif /* CONFIG_BLK_DEV_INITRD */ 156 157 void __init setup_bootmem(void) 158 { 159 phys_addr_t mem_start = 0; 160 phys_addr_t start, end = 0; 161 phys_addr_t vmlinux_end = __pa_symbol(&_end); 162 phys_addr_t vmlinux_start = __pa_symbol(&_start); 163 u64 i; 164 165 /* Find the memory region containing the kernel */ 166 for_each_mem_range(i, &start, &end) { 167 phys_addr_t size = end - start; 168 if (!mem_start) 169 mem_start = start; 170 if (start <= vmlinux_start && vmlinux_end <= end) 171 BUG_ON(size == 0); 172 } 173 174 /* 175 * The maximal physical memory size is -PAGE_OFFSET. 176 * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed 177 * as it is unusable by kernel. 178 */ 179 memblock_enforce_memory_limit(-PAGE_OFFSET); 180 181 /* Reserve from the start of the kernel to the end of the kernel */ 182 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 183 184 max_pfn = PFN_DOWN(memblock_end_of_DRAM()); 185 max_low_pfn = max_pfn; 186 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 187 set_max_mapnr(max_low_pfn); 188 189 #ifdef CONFIG_BLK_DEV_INITRD 190 setup_initrd(); 191 #endif /* CONFIG_BLK_DEV_INITRD */ 192 193 /* 194 * Avoid using early_init_fdt_reserve_self() since __pa() does 195 * not work for DTB pointers that are fixmap addresses 196 */ 197 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 198 199 early_init_fdt_scan_reserved_mem(); 200 dma_contiguous_reserve(dma32_phys_limit); 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 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 301 302 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 303 { 304 /* Before MMU is enabled */ 305 return (pmd_t *)((uintptr_t)pa); 306 } 307 308 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 309 { 310 clear_fixmap(FIX_PMD); 311 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 312 } 313 314 static pmd_t *get_pmd_virt_late(phys_addr_t pa) 315 { 316 return (pmd_t *) __va(pa); 317 } 318 319 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 320 { 321 uintptr_t pmd_num; 322 323 pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT; 324 BUG_ON(pmd_num >= NUM_EARLY_PMDS); 325 return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD]; 326 } 327 328 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 329 { 330 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 331 } 332 333 static phys_addr_t alloc_pmd_late(uintptr_t va) 334 { 335 unsigned long vaddr; 336 337 vaddr = __get_free_page(GFP_KERNEL); 338 BUG_ON(!vaddr); 339 return __pa(vaddr); 340 } 341 342 static void __init create_pmd_mapping(pmd_t *pmdp, 343 uintptr_t va, phys_addr_t pa, 344 phys_addr_t sz, pgprot_t prot) 345 { 346 pte_t *ptep; 347 phys_addr_t pte_phys; 348 uintptr_t pmd_idx = pmd_index(va); 349 350 if (sz == PMD_SIZE) { 351 if (pmd_none(pmdp[pmd_idx])) 352 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 353 return; 354 } 355 356 if (pmd_none(pmdp[pmd_idx])) { 357 pte_phys = pt_ops.alloc_pte(va); 358 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 359 ptep = pt_ops.get_pte_virt(pte_phys); 360 memset(ptep, 0, PAGE_SIZE); 361 } else { 362 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 363 ptep = pt_ops.get_pte_virt(pte_phys); 364 } 365 366 create_pte_mapping(ptep, va, pa, sz, prot); 367 } 368 369 #define pgd_next_t pmd_t 370 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va) 371 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa) 372 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 373 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot) 374 #define fixmap_pgd_next fixmap_pmd 375 #else 376 #define pgd_next_t pte_t 377 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 378 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 379 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 380 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 381 #define fixmap_pgd_next fixmap_pte 382 #endif 383 384 void __init create_pgd_mapping(pgd_t *pgdp, 385 uintptr_t va, phys_addr_t pa, 386 phys_addr_t sz, pgprot_t prot) 387 { 388 pgd_next_t *nextp; 389 phys_addr_t next_phys; 390 uintptr_t pgd_idx = pgd_index(va); 391 392 if (sz == PGDIR_SIZE) { 393 if (pgd_val(pgdp[pgd_idx]) == 0) 394 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 395 return; 396 } 397 398 if (pgd_val(pgdp[pgd_idx]) == 0) { 399 next_phys = alloc_pgd_next(va); 400 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 401 nextp = get_pgd_next_virt(next_phys); 402 memset(nextp, 0, PAGE_SIZE); 403 } else { 404 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 405 nextp = get_pgd_next_virt(next_phys); 406 } 407 408 create_pgd_next_mapping(nextp, va, pa, sz, prot); 409 } 410 411 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 412 { 413 /* Upgrade to PMD_SIZE mappings whenever possible */ 414 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) 415 return PAGE_SIZE; 416 417 return PMD_SIZE; 418 } 419 420 /* 421 * setup_vm() is called from head.S with MMU-off. 422 * 423 * Following requirements should be honoured for setup_vm() to work 424 * correctly: 425 * 1) It should use PC-relative addressing for accessing kernel symbols. 426 * To achieve this we always use GCC cmodel=medany. 427 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 428 * so disable compiler instrumentation when FTRACE is enabled. 429 * 430 * Currently, the above requirements are honoured by using custom CFLAGS 431 * for init.o in mm/Makefile. 432 */ 433 434 #ifndef __riscv_cmodel_medany 435 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 436 #endif 437 438 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 439 { 440 uintptr_t va, pa, end_va; 441 uintptr_t load_pa = (uintptr_t)(&_start); 442 uintptr_t load_sz = (uintptr_t)(&_end) - load_pa; 443 uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE); 444 #ifndef __PAGETABLE_PMD_FOLDED 445 pmd_t fix_bmap_spmd, fix_bmap_epmd; 446 #endif 447 448 va_pa_offset = PAGE_OFFSET - load_pa; 449 pfn_base = PFN_DOWN(load_pa); 450 451 /* 452 * Enforce boot alignment requirements of RV32 and 453 * RV64 by only allowing PMD or PGD mappings. 454 */ 455 BUG_ON(map_size == PAGE_SIZE); 456 457 /* Sanity check alignment and size */ 458 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 459 BUG_ON((load_pa % map_size) != 0); 460 BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE); 461 462 pt_ops.alloc_pte = alloc_pte_early; 463 pt_ops.get_pte_virt = get_pte_virt_early; 464 #ifndef __PAGETABLE_PMD_FOLDED 465 pt_ops.alloc_pmd = alloc_pmd_early; 466 pt_ops.get_pmd_virt = get_pmd_virt_early; 467 #endif 468 /* Setup early PGD for fixmap */ 469 create_pgd_mapping(early_pg_dir, FIXADDR_START, 470 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 471 472 #ifndef __PAGETABLE_PMD_FOLDED 473 /* Setup fixmap PMD */ 474 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 475 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 476 /* Setup trampoline PGD and PMD */ 477 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 478 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE); 479 create_pmd_mapping(trampoline_pmd, PAGE_OFFSET, 480 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC); 481 #else 482 /* Setup trampoline PGD */ 483 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 484 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC); 485 #endif 486 487 /* 488 * Setup early PGD covering entire kernel which will allows 489 * us to reach paging_init(). We map all memory banks later 490 * in setup_vm_final() below. 491 */ 492 end_va = PAGE_OFFSET + load_sz; 493 for (va = PAGE_OFFSET; va < end_va; va += map_size) 494 create_pgd_mapping(early_pg_dir, va, 495 load_pa + (va - PAGE_OFFSET), 496 map_size, PAGE_KERNEL_EXEC); 497 498 #ifndef __PAGETABLE_PMD_FOLDED 499 /* Setup early PMD for DTB */ 500 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 501 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE); 502 /* Create two consecutive PMD mappings for FDT early scan */ 503 pa = dtb_pa & ~(PMD_SIZE - 1); 504 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA, 505 pa, PMD_SIZE, PAGE_KERNEL); 506 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE, 507 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 508 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1)); 509 #else 510 /* Create two consecutive PGD mappings for FDT early scan */ 511 pa = dtb_pa & ~(PGDIR_SIZE - 1); 512 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 513 pa, PGDIR_SIZE, PAGE_KERNEL); 514 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE, 515 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL); 516 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1)); 517 #endif 518 dtb_early_pa = dtb_pa; 519 520 /* 521 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 522 * range can not span multiple pmds. 523 */ 524 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 525 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 526 527 #ifndef __PAGETABLE_PMD_FOLDED 528 /* 529 * Early ioremap fixmap is already created as it lies within first 2MB 530 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 531 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 532 * the user if not. 533 */ 534 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 535 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 536 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 537 WARN_ON(1); 538 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 539 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 540 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 541 fix_to_virt(FIX_BTMAP_BEGIN)); 542 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 543 fix_to_virt(FIX_BTMAP_END)); 544 545 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 546 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 547 } 548 #endif 549 } 550 551 static void __init setup_vm_final(void) 552 { 553 uintptr_t va, map_size; 554 phys_addr_t pa, start, end; 555 u64 i; 556 557 /** 558 * MMU is enabled at this point. But page table setup is not complete yet. 559 * fixmap page table alloc functions should be used at this point 560 */ 561 pt_ops.alloc_pte = alloc_pte_fixmap; 562 pt_ops.get_pte_virt = get_pte_virt_fixmap; 563 #ifndef __PAGETABLE_PMD_FOLDED 564 pt_ops.alloc_pmd = alloc_pmd_fixmap; 565 pt_ops.get_pmd_virt = get_pmd_virt_fixmap; 566 #endif 567 /* Setup swapper PGD for fixmap */ 568 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 569 __pa_symbol(fixmap_pgd_next), 570 PGDIR_SIZE, PAGE_TABLE); 571 572 /* Map all memory banks */ 573 for_each_mem_range(i, &start, &end) { 574 if (start >= end) 575 break; 576 if (start <= __pa(PAGE_OFFSET) && 577 __pa(PAGE_OFFSET) < end) 578 start = __pa(PAGE_OFFSET); 579 580 map_size = best_map_size(start, end - start); 581 for (pa = start; pa < end; pa += map_size) { 582 va = (uintptr_t)__va(pa); 583 create_pgd_mapping(swapper_pg_dir, va, pa, 584 map_size, PAGE_KERNEL_EXEC); 585 } 586 } 587 588 /* Clear fixmap PTE and PMD mappings */ 589 clear_fixmap(FIX_PTE); 590 clear_fixmap(FIX_PMD); 591 592 /* Move to swapper page table */ 593 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE); 594 local_flush_tlb_all(); 595 596 /* generic page allocation functions must be used to setup page table */ 597 pt_ops.alloc_pte = alloc_pte_late; 598 pt_ops.get_pte_virt = get_pte_virt_late; 599 #ifndef __PAGETABLE_PMD_FOLDED 600 pt_ops.alloc_pmd = alloc_pmd_late; 601 pt_ops.get_pmd_virt = get_pmd_virt_late; 602 #endif 603 } 604 #else 605 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 606 { 607 #ifdef CONFIG_BUILTIN_DTB 608 dtb_early_va = soc_lookup_builtin_dtb(); 609 if (!dtb_early_va) { 610 /* Fallback to first available DTS */ 611 dtb_early_va = (void *) __dtb_start; 612 } 613 #else 614 dtb_early_va = (void *)dtb_pa; 615 #endif 616 dtb_early_pa = dtb_pa; 617 } 618 619 static inline void setup_vm_final(void) 620 { 621 } 622 #endif /* CONFIG_MMU */ 623 624 #ifdef CONFIG_STRICT_KERNEL_RWX 625 void protect_kernel_text_data(void) 626 { 627 unsigned long text_start = (unsigned long)_start; 628 unsigned long init_text_start = (unsigned long)__init_text_begin; 629 unsigned long init_data_start = (unsigned long)__init_data_begin; 630 unsigned long rodata_start = (unsigned long)__start_rodata; 631 unsigned long data_start = (unsigned long)_data; 632 unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn))); 633 634 set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT); 635 set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT); 636 set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT); 637 /* rodata section is marked readonly in mark_rodata_ro */ 638 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 639 set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT); 640 } 641 642 void mark_rodata_ro(void) 643 { 644 unsigned long rodata_start = (unsigned long)__start_rodata; 645 unsigned long data_start = (unsigned long)_data; 646 647 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 648 649 debug_checkwx(); 650 } 651 #endif 652 653 void __init paging_init(void) 654 { 655 setup_vm_final(); 656 sparse_init(); 657 setup_zero_page(); 658 zone_sizes_init(); 659 } 660 661 #ifdef CONFIG_SPARSEMEM_VMEMMAP 662 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 663 struct vmem_altmap *altmap) 664 { 665 return vmemmap_populate_basepages(start, end, node, NULL); 666 } 667 #endif 668