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 struct memblock_region *reg; 158 phys_addr_t mem_size = 0; 159 phys_addr_t total_mem = 0; 160 phys_addr_t mem_start, end = 0; 161 phys_addr_t vmlinux_end = __pa_symbol(&_end); 162 phys_addr_t vmlinux_start = __pa_symbol(&_start); 163 164 /* Find the memory region containing the kernel */ 165 for_each_memblock(memory, reg) { 166 end = reg->base + reg->size; 167 if (!total_mem) 168 mem_start = reg->base; 169 if (reg->base <= vmlinux_start && vmlinux_end <= end) 170 BUG_ON(reg->size == 0); 171 total_mem = total_mem + reg->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 for_each_memblock(memory, reg) { 205 unsigned long start_pfn = memblock_region_memory_base_pfn(reg); 206 unsigned long end_pfn = memblock_region_memory_end_pfn(reg); 207 208 memblock_set_node(PFN_PHYS(start_pfn), 209 PFN_PHYS(end_pfn - start_pfn), 210 &memblock.memory, 0); 211 } 212 } 213 214 #ifdef CONFIG_MMU 215 static struct pt_alloc_ops pt_ops; 216 217 unsigned long va_pa_offset; 218 EXPORT_SYMBOL(va_pa_offset); 219 unsigned long pfn_base; 220 EXPORT_SYMBOL(pfn_base); 221 222 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 223 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 224 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 225 226 #define MAX_EARLY_MAPPING_SIZE SZ_128M 227 228 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 229 230 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 231 { 232 unsigned long addr = __fix_to_virt(idx); 233 pte_t *ptep; 234 235 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 236 237 ptep = &fixmap_pte[pte_index(addr)]; 238 239 if (pgprot_val(prot)) { 240 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 241 } else { 242 pte_clear(&init_mm, addr, ptep); 243 local_flush_tlb_page(addr); 244 } 245 } 246 247 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 248 { 249 return (pte_t *)((uintptr_t)pa); 250 } 251 252 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 253 { 254 clear_fixmap(FIX_PTE); 255 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 256 } 257 258 static inline pte_t *get_pte_virt_late(phys_addr_t pa) 259 { 260 return (pte_t *) __va(pa); 261 } 262 263 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 264 { 265 /* 266 * We only create PMD or PGD early mappings so we 267 * should never reach here with MMU disabled. 268 */ 269 BUG(); 270 } 271 272 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 273 { 274 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 275 } 276 277 static phys_addr_t alloc_pte_late(uintptr_t va) 278 { 279 unsigned long vaddr; 280 281 vaddr = __get_free_page(GFP_KERNEL); 282 if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr))) 283 BUG(); 284 return __pa(vaddr); 285 } 286 287 static void __init create_pte_mapping(pte_t *ptep, 288 uintptr_t va, phys_addr_t pa, 289 phys_addr_t sz, pgprot_t prot) 290 { 291 uintptr_t pte_idx = pte_index(va); 292 293 BUG_ON(sz != PAGE_SIZE); 294 295 if (pte_none(ptep[pte_idx])) 296 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 297 } 298 299 #ifndef __PAGETABLE_PMD_FOLDED 300 301 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 302 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 303 304 #if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE 305 #define NUM_EARLY_PMDS 1UL 306 #else 307 #define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE) 308 #endif 309 pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE); 310 311 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 312 { 313 /* Before MMU is enabled */ 314 return (pmd_t *)((uintptr_t)pa); 315 } 316 317 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 318 { 319 clear_fixmap(FIX_PMD); 320 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 321 } 322 323 static pmd_t *get_pmd_virt_late(phys_addr_t pa) 324 { 325 return (pmd_t *) __va(pa); 326 } 327 328 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 329 { 330 uintptr_t pmd_num; 331 332 pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT; 333 BUG_ON(pmd_num >= NUM_EARLY_PMDS); 334 return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD]; 335 } 336 337 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 338 { 339 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 340 } 341 342 static phys_addr_t alloc_pmd_late(uintptr_t va) 343 { 344 unsigned long vaddr; 345 346 vaddr = __get_free_page(GFP_KERNEL); 347 BUG_ON(!vaddr); 348 return __pa(vaddr); 349 } 350 351 static void __init create_pmd_mapping(pmd_t *pmdp, 352 uintptr_t va, phys_addr_t pa, 353 phys_addr_t sz, pgprot_t prot) 354 { 355 pte_t *ptep; 356 phys_addr_t pte_phys; 357 uintptr_t pmd_idx = pmd_index(va); 358 359 if (sz == PMD_SIZE) { 360 if (pmd_none(pmdp[pmd_idx])) 361 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 362 return; 363 } 364 365 if (pmd_none(pmdp[pmd_idx])) { 366 pte_phys = pt_ops.alloc_pte(va); 367 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 368 ptep = pt_ops.get_pte_virt(pte_phys); 369 memset(ptep, 0, PAGE_SIZE); 370 } else { 371 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 372 ptep = pt_ops.get_pte_virt(pte_phys); 373 } 374 375 create_pte_mapping(ptep, va, pa, sz, prot); 376 } 377 378 #define pgd_next_t pmd_t 379 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va) 380 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa) 381 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 382 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot) 383 #define fixmap_pgd_next fixmap_pmd 384 #else 385 #define pgd_next_t pte_t 386 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 387 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 388 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 389 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 390 #define fixmap_pgd_next fixmap_pte 391 #endif 392 393 void __init create_pgd_mapping(pgd_t *pgdp, 394 uintptr_t va, phys_addr_t pa, 395 phys_addr_t sz, pgprot_t prot) 396 { 397 pgd_next_t *nextp; 398 phys_addr_t next_phys; 399 uintptr_t pgd_idx = pgd_index(va); 400 401 if (sz == PGDIR_SIZE) { 402 if (pgd_val(pgdp[pgd_idx]) == 0) 403 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 404 return; 405 } 406 407 if (pgd_val(pgdp[pgd_idx]) == 0) { 408 next_phys = alloc_pgd_next(va); 409 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 410 nextp = get_pgd_next_virt(next_phys); 411 memset(nextp, 0, PAGE_SIZE); 412 } else { 413 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 414 nextp = get_pgd_next_virt(next_phys); 415 } 416 417 create_pgd_next_mapping(nextp, va, pa, sz, prot); 418 } 419 420 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 421 { 422 /* Upgrade to PMD_SIZE mappings whenever possible */ 423 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) 424 return PAGE_SIZE; 425 426 return PMD_SIZE; 427 } 428 429 /* 430 * setup_vm() is called from head.S with MMU-off. 431 * 432 * Following requirements should be honoured for setup_vm() to work 433 * correctly: 434 * 1) It should use PC-relative addressing for accessing kernel symbols. 435 * To achieve this we always use GCC cmodel=medany. 436 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 437 * so disable compiler instrumentation when FTRACE is enabled. 438 * 439 * Currently, the above requirements are honoured by using custom CFLAGS 440 * for init.o in mm/Makefile. 441 */ 442 443 #ifndef __riscv_cmodel_medany 444 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 445 #endif 446 447 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 448 { 449 uintptr_t va, pa, end_va; 450 uintptr_t load_pa = (uintptr_t)(&_start); 451 uintptr_t load_sz = (uintptr_t)(&_end) - load_pa; 452 uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE); 453 #ifndef __PAGETABLE_PMD_FOLDED 454 pmd_t fix_bmap_spmd, fix_bmap_epmd; 455 #endif 456 457 va_pa_offset = PAGE_OFFSET - load_pa; 458 pfn_base = PFN_DOWN(load_pa); 459 460 /* 461 * Enforce boot alignment requirements of RV32 and 462 * RV64 by only allowing PMD or PGD mappings. 463 */ 464 BUG_ON(map_size == PAGE_SIZE); 465 466 /* Sanity check alignment and size */ 467 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 468 BUG_ON((load_pa % map_size) != 0); 469 BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE); 470 471 pt_ops.alloc_pte = alloc_pte_early; 472 pt_ops.get_pte_virt = get_pte_virt_early; 473 #ifndef __PAGETABLE_PMD_FOLDED 474 pt_ops.alloc_pmd = alloc_pmd_early; 475 pt_ops.get_pmd_virt = get_pmd_virt_early; 476 #endif 477 /* Setup early PGD for fixmap */ 478 create_pgd_mapping(early_pg_dir, FIXADDR_START, 479 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 480 481 #ifndef __PAGETABLE_PMD_FOLDED 482 /* Setup fixmap PMD */ 483 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 484 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 485 /* Setup trampoline PGD and PMD */ 486 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 487 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE); 488 create_pmd_mapping(trampoline_pmd, PAGE_OFFSET, 489 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC); 490 #else 491 /* Setup trampoline PGD */ 492 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 493 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC); 494 #endif 495 496 /* 497 * Setup early PGD covering entire kernel which will allows 498 * us to reach paging_init(). We map all memory banks later 499 * in setup_vm_final() below. 500 */ 501 end_va = PAGE_OFFSET + load_sz; 502 for (va = PAGE_OFFSET; va < end_va; va += map_size) 503 create_pgd_mapping(early_pg_dir, va, 504 load_pa + (va - PAGE_OFFSET), 505 map_size, PAGE_KERNEL_EXEC); 506 507 /* Create two consecutive PGD mappings for FDT early scan */ 508 pa = dtb_pa & ~(PGDIR_SIZE - 1); 509 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 510 pa, PGDIR_SIZE, PAGE_KERNEL); 511 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE, 512 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL); 513 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1)); 514 dtb_early_pa = dtb_pa; 515 516 /* 517 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 518 * range can not span multiple pmds. 519 */ 520 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 521 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 522 523 #ifndef __PAGETABLE_PMD_FOLDED 524 /* 525 * Early ioremap fixmap is already created as it lies within first 2MB 526 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 527 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 528 * the user if not. 529 */ 530 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 531 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 532 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 533 WARN_ON(1); 534 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 535 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 536 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 537 fix_to_virt(FIX_BTMAP_BEGIN)); 538 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 539 fix_to_virt(FIX_BTMAP_END)); 540 541 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 542 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 543 } 544 #endif 545 } 546 547 static void __init setup_vm_final(void) 548 { 549 uintptr_t va, map_size; 550 phys_addr_t pa, start, end; 551 struct memblock_region *reg; 552 553 /** 554 * MMU is enabled at this point. But page table setup is not complete yet. 555 * fixmap page table alloc functions should be used at this point 556 */ 557 pt_ops.alloc_pte = alloc_pte_fixmap; 558 pt_ops.get_pte_virt = get_pte_virt_fixmap; 559 #ifndef __PAGETABLE_PMD_FOLDED 560 pt_ops.alloc_pmd = alloc_pmd_fixmap; 561 pt_ops.get_pmd_virt = get_pmd_virt_fixmap; 562 #endif 563 /* Setup swapper PGD for fixmap */ 564 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 565 __pa_symbol(fixmap_pgd_next), 566 PGDIR_SIZE, PAGE_TABLE); 567 568 /* Map all memory banks */ 569 for_each_memblock(memory, reg) { 570 start = reg->base; 571 end = start + reg->size; 572 573 if (start >= end) 574 break; 575 if (memblock_is_nomap(reg)) 576 continue; 577 if (start <= __pa(PAGE_OFFSET) && 578 __pa(PAGE_OFFSET) < end) 579 start = __pa(PAGE_OFFSET); 580 581 map_size = best_map_size(start, end - start); 582 for (pa = start; pa < end; pa += map_size) { 583 va = (uintptr_t)__va(pa); 584 create_pgd_mapping(swapper_pg_dir, va, pa, 585 map_size, PAGE_KERNEL_EXEC); 586 } 587 } 588 589 /* Clear fixmap PTE and PMD mappings */ 590 clear_fixmap(FIX_PTE); 591 clear_fixmap(FIX_PMD); 592 593 /* Move to swapper page table */ 594 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE); 595 local_flush_tlb_all(); 596 597 /* generic page allocation functions must be used to setup page table */ 598 pt_ops.alloc_pte = alloc_pte_late; 599 pt_ops.get_pte_virt = get_pte_virt_late; 600 #ifndef __PAGETABLE_PMD_FOLDED 601 pt_ops.alloc_pmd = alloc_pmd_late; 602 pt_ops.get_pmd_virt = get_pmd_virt_late; 603 #endif 604 } 605 #else 606 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 607 { 608 #ifdef CONFIG_BUILTIN_DTB 609 dtb_early_va = soc_lookup_builtin_dtb(); 610 if (!dtb_early_va) { 611 /* Fallback to first available DTS */ 612 dtb_early_va = (void *) __dtb_start; 613 } 614 #else 615 dtb_early_va = (void *)dtb_pa; 616 #endif 617 dtb_early_pa = dtb_pa; 618 } 619 620 static inline void setup_vm_final(void) 621 { 622 } 623 #endif /* CONFIG_MMU */ 624 625 #ifdef CONFIG_STRICT_KERNEL_RWX 626 void mark_rodata_ro(void) 627 { 628 unsigned long text_start = (unsigned long)_text; 629 unsigned long text_end = (unsigned long)_etext; 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, (text_end - text_start) >> PAGE_SHIFT); 635 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 636 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 637 set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT); 638 639 debug_checkwx(); 640 } 641 #endif 642 643 static void __init resource_init(void) 644 { 645 struct memblock_region *region; 646 647 for_each_memblock(memory, region) { 648 struct resource *res; 649 650 res = memblock_alloc(sizeof(struct resource), SMP_CACHE_BYTES); 651 if (!res) 652 panic("%s: Failed to allocate %zu bytes\n", __func__, 653 sizeof(struct resource)); 654 655 if (memblock_is_nomap(region)) { 656 res->name = "reserved"; 657 res->flags = IORESOURCE_MEM; 658 } else { 659 res->name = "System RAM"; 660 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 661 } 662 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 663 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 664 665 request_resource(&iomem_resource, res); 666 } 667 } 668 669 void __init paging_init(void) 670 { 671 setup_vm_final(); 672 sparse_init(); 673 setup_zero_page(); 674 zone_sizes_init(); 675 resource_init(); 676 } 677 678 #ifdef CONFIG_SPARSEMEM_VMEMMAP 679 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 680 struct vmem_altmap *altmap) 681 { 682 return vmemmap_populate_basepages(start, end, node, NULL); 683 } 684 #endif 685