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, dram_end, end = 0; 161 phys_addr_t vmlinux_end = __pa_symbol(&_end); 162 phys_addr_t vmlinux_start = __pa_symbol(&_start); 163 phys_addr_t max_mapped_addr = __pa(~(ulong)0); 164 u64 i; 165 166 /* Find the memory region containing the kernel */ 167 for_each_mem_range(i, &start, &end) { 168 phys_addr_t size = end - start; 169 if (!mem_start) 170 mem_start = start; 171 if (start <= vmlinux_start && vmlinux_end <= end) 172 BUG_ON(size == 0); 173 } 174 175 /* 176 * The maximal physical memory size is -PAGE_OFFSET. 177 * Make sure that any memory beyond mem_start + (-PAGE_OFFSET) is removed 178 * as it is unusable by kernel. 179 */ 180 memblock_enforce_memory_limit(-PAGE_OFFSET); 181 182 /* Reserve from the start of the kernel to the end of the kernel */ 183 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 184 185 dram_end = memblock_end_of_DRAM(); 186 187 /* 188 * memblock allocator is not aware of the fact that last 4K bytes of 189 * the addressable memory can not be mapped because of IS_ERR_VALUE 190 * macro. Make sure that last 4k bytes are not usable by memblock 191 * if end of dram is equal to maximum addressable memory. 192 */ 193 if (max_mapped_addr == (dram_end - 1)) 194 memblock_set_current_limit(max_mapped_addr - 4096); 195 196 max_pfn = PFN_DOWN(dram_end); 197 max_low_pfn = max_pfn; 198 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 199 set_max_mapnr(max_low_pfn); 200 201 #ifdef CONFIG_BLK_DEV_INITRD 202 setup_initrd(); 203 #endif /* CONFIG_BLK_DEV_INITRD */ 204 205 /* 206 * Avoid using early_init_fdt_reserve_self() since __pa() does 207 * not work for DTB pointers that are fixmap addresses 208 */ 209 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 210 211 early_init_fdt_scan_reserved_mem(); 212 dma_contiguous_reserve(dma32_phys_limit); 213 memblock_allow_resize(); 214 memblock_dump_all(); 215 } 216 217 #ifdef CONFIG_MMU 218 static struct pt_alloc_ops pt_ops; 219 220 unsigned long va_pa_offset; 221 EXPORT_SYMBOL(va_pa_offset); 222 unsigned long pfn_base; 223 EXPORT_SYMBOL(pfn_base); 224 225 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 226 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 227 pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 228 229 #define MAX_EARLY_MAPPING_SIZE SZ_128M 230 231 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 232 233 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 234 { 235 unsigned long addr = __fix_to_virt(idx); 236 pte_t *ptep; 237 238 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 239 240 ptep = &fixmap_pte[pte_index(addr)]; 241 242 if (pgprot_val(prot)) 243 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 244 else 245 pte_clear(&init_mm, addr, ptep); 246 local_flush_tlb_page(addr); 247 } 248 249 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 250 { 251 return (pte_t *)((uintptr_t)pa); 252 } 253 254 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 255 { 256 clear_fixmap(FIX_PTE); 257 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 258 } 259 260 static inline pte_t *get_pte_virt_late(phys_addr_t pa) 261 { 262 return (pte_t *) __va(pa); 263 } 264 265 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 266 { 267 /* 268 * We only create PMD or PGD early mappings so we 269 * should never reach here with MMU disabled. 270 */ 271 BUG(); 272 } 273 274 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 275 { 276 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 277 } 278 279 static phys_addr_t alloc_pte_late(uintptr_t va) 280 { 281 unsigned long vaddr; 282 283 vaddr = __get_free_page(GFP_KERNEL); 284 if (!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr))) 285 BUG(); 286 return __pa(vaddr); 287 } 288 289 static void __init create_pte_mapping(pte_t *ptep, 290 uintptr_t va, phys_addr_t pa, 291 phys_addr_t sz, pgprot_t prot) 292 { 293 uintptr_t pte_idx = pte_index(va); 294 295 BUG_ON(sz != PAGE_SIZE); 296 297 if (pte_none(ptep[pte_idx])) 298 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 299 } 300 301 #ifndef __PAGETABLE_PMD_FOLDED 302 303 pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 304 pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 305 306 #if MAX_EARLY_MAPPING_SIZE < PGDIR_SIZE 307 #define NUM_EARLY_PMDS 1UL 308 #else 309 #define NUM_EARLY_PMDS (1UL + MAX_EARLY_MAPPING_SIZE / PGDIR_SIZE) 310 #endif 311 pmd_t early_pmd[PTRS_PER_PMD * NUM_EARLY_PMDS] __initdata __aligned(PAGE_SIZE); 312 pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 313 314 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 315 { 316 /* Before MMU is enabled */ 317 return (pmd_t *)((uintptr_t)pa); 318 } 319 320 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 321 { 322 clear_fixmap(FIX_PMD); 323 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 324 } 325 326 static pmd_t *get_pmd_virt_late(phys_addr_t pa) 327 { 328 return (pmd_t *) __va(pa); 329 } 330 331 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 332 { 333 uintptr_t pmd_num; 334 335 pmd_num = (va - PAGE_OFFSET) >> PGDIR_SHIFT; 336 BUG_ON(pmd_num >= NUM_EARLY_PMDS); 337 return (uintptr_t)&early_pmd[pmd_num * PTRS_PER_PMD]; 338 } 339 340 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 341 { 342 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 343 } 344 345 static phys_addr_t alloc_pmd_late(uintptr_t va) 346 { 347 unsigned long vaddr; 348 349 vaddr = __get_free_page(GFP_KERNEL); 350 BUG_ON(!vaddr); 351 return __pa(vaddr); 352 } 353 354 static void __init create_pmd_mapping(pmd_t *pmdp, 355 uintptr_t va, phys_addr_t pa, 356 phys_addr_t sz, pgprot_t prot) 357 { 358 pte_t *ptep; 359 phys_addr_t pte_phys; 360 uintptr_t pmd_idx = pmd_index(va); 361 362 if (sz == PMD_SIZE) { 363 if (pmd_none(pmdp[pmd_idx])) 364 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 365 return; 366 } 367 368 if (pmd_none(pmdp[pmd_idx])) { 369 pte_phys = pt_ops.alloc_pte(va); 370 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 371 ptep = pt_ops.get_pte_virt(pte_phys); 372 memset(ptep, 0, PAGE_SIZE); 373 } else { 374 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 375 ptep = pt_ops.get_pte_virt(pte_phys); 376 } 377 378 create_pte_mapping(ptep, va, pa, sz, prot); 379 } 380 381 #define pgd_next_t pmd_t 382 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va) 383 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa) 384 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 385 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot) 386 #define fixmap_pgd_next fixmap_pmd 387 #else 388 #define pgd_next_t pte_t 389 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 390 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 391 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 392 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 393 #define fixmap_pgd_next fixmap_pte 394 #endif 395 396 void __init create_pgd_mapping(pgd_t *pgdp, 397 uintptr_t va, phys_addr_t pa, 398 phys_addr_t sz, pgprot_t prot) 399 { 400 pgd_next_t *nextp; 401 phys_addr_t next_phys; 402 uintptr_t pgd_idx = pgd_index(va); 403 404 if (sz == PGDIR_SIZE) { 405 if (pgd_val(pgdp[pgd_idx]) == 0) 406 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 407 return; 408 } 409 410 if (pgd_val(pgdp[pgd_idx]) == 0) { 411 next_phys = alloc_pgd_next(va); 412 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 413 nextp = get_pgd_next_virt(next_phys); 414 memset(nextp, 0, PAGE_SIZE); 415 } else { 416 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 417 nextp = get_pgd_next_virt(next_phys); 418 } 419 420 create_pgd_next_mapping(nextp, va, pa, sz, prot); 421 } 422 423 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 424 { 425 /* Upgrade to PMD_SIZE mappings whenever possible */ 426 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) 427 return PAGE_SIZE; 428 429 return PMD_SIZE; 430 } 431 432 /* 433 * setup_vm() is called from head.S with MMU-off. 434 * 435 * Following requirements should be honoured for setup_vm() to work 436 * correctly: 437 * 1) It should use PC-relative addressing for accessing kernel symbols. 438 * To achieve this we always use GCC cmodel=medany. 439 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 440 * so disable compiler instrumentation when FTRACE is enabled. 441 * 442 * Currently, the above requirements are honoured by using custom CFLAGS 443 * for init.o in mm/Makefile. 444 */ 445 446 #ifndef __riscv_cmodel_medany 447 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 448 #endif 449 450 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 451 { 452 uintptr_t va, pa, end_va; 453 uintptr_t load_pa = (uintptr_t)(&_start); 454 uintptr_t load_sz = (uintptr_t)(&_end) - load_pa; 455 uintptr_t map_size = best_map_size(load_pa, MAX_EARLY_MAPPING_SIZE); 456 #ifndef __PAGETABLE_PMD_FOLDED 457 pmd_t fix_bmap_spmd, fix_bmap_epmd; 458 #endif 459 460 va_pa_offset = PAGE_OFFSET - load_pa; 461 pfn_base = PFN_DOWN(load_pa); 462 463 /* 464 * Enforce boot alignment requirements of RV32 and 465 * RV64 by only allowing PMD or PGD mappings. 466 */ 467 BUG_ON(map_size == PAGE_SIZE); 468 469 /* Sanity check alignment and size */ 470 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 471 BUG_ON((load_pa % map_size) != 0); 472 BUG_ON(load_sz > MAX_EARLY_MAPPING_SIZE); 473 474 pt_ops.alloc_pte = alloc_pte_early; 475 pt_ops.get_pte_virt = get_pte_virt_early; 476 #ifndef __PAGETABLE_PMD_FOLDED 477 pt_ops.alloc_pmd = alloc_pmd_early; 478 pt_ops.get_pmd_virt = get_pmd_virt_early; 479 #endif 480 /* Setup early PGD for fixmap */ 481 create_pgd_mapping(early_pg_dir, FIXADDR_START, 482 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 483 484 #ifndef __PAGETABLE_PMD_FOLDED 485 /* Setup fixmap PMD */ 486 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 487 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 488 /* Setup trampoline PGD and PMD */ 489 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 490 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE); 491 create_pmd_mapping(trampoline_pmd, PAGE_OFFSET, 492 load_pa, PMD_SIZE, PAGE_KERNEL_EXEC); 493 #else 494 /* Setup trampoline PGD */ 495 create_pgd_mapping(trampoline_pg_dir, PAGE_OFFSET, 496 load_pa, PGDIR_SIZE, PAGE_KERNEL_EXEC); 497 #endif 498 499 /* 500 * Setup early PGD covering entire kernel which will allows 501 * us to reach paging_init(). We map all memory banks later 502 * in setup_vm_final() below. 503 */ 504 end_va = PAGE_OFFSET + load_sz; 505 for (va = PAGE_OFFSET; va < end_va; va += map_size) 506 create_pgd_mapping(early_pg_dir, va, 507 load_pa + (va - PAGE_OFFSET), 508 map_size, PAGE_KERNEL_EXEC); 509 510 #ifndef __PAGETABLE_PMD_FOLDED 511 /* Setup early PMD for DTB */ 512 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 513 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE); 514 /* Create two consecutive PMD mappings for FDT early scan */ 515 pa = dtb_pa & ~(PMD_SIZE - 1); 516 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA, 517 pa, PMD_SIZE, PAGE_KERNEL); 518 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE, 519 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 520 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1)); 521 #else 522 /* Create two consecutive PGD mappings for FDT early scan */ 523 pa = dtb_pa & ~(PGDIR_SIZE - 1); 524 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 525 pa, PGDIR_SIZE, PAGE_KERNEL); 526 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE, 527 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL); 528 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1)); 529 #endif 530 dtb_early_pa = dtb_pa; 531 532 /* 533 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 534 * range can not span multiple pmds. 535 */ 536 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 537 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 538 539 #ifndef __PAGETABLE_PMD_FOLDED 540 /* 541 * Early ioremap fixmap is already created as it lies within first 2MB 542 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 543 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 544 * the user if not. 545 */ 546 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 547 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 548 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 549 WARN_ON(1); 550 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 551 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 552 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 553 fix_to_virt(FIX_BTMAP_BEGIN)); 554 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 555 fix_to_virt(FIX_BTMAP_END)); 556 557 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 558 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 559 } 560 #endif 561 } 562 563 static void __init setup_vm_final(void) 564 { 565 uintptr_t va, map_size; 566 phys_addr_t pa, start, end; 567 u64 i; 568 569 /** 570 * MMU is enabled at this point. But page table setup is not complete yet. 571 * fixmap page table alloc functions should be used at this point 572 */ 573 pt_ops.alloc_pte = alloc_pte_fixmap; 574 pt_ops.get_pte_virt = get_pte_virt_fixmap; 575 #ifndef __PAGETABLE_PMD_FOLDED 576 pt_ops.alloc_pmd = alloc_pmd_fixmap; 577 pt_ops.get_pmd_virt = get_pmd_virt_fixmap; 578 #endif 579 /* Setup swapper PGD for fixmap */ 580 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 581 __pa_symbol(fixmap_pgd_next), 582 PGDIR_SIZE, PAGE_TABLE); 583 584 /* Map all memory banks */ 585 for_each_mem_range(i, &start, &end) { 586 if (start >= end) 587 break; 588 if (start <= __pa(PAGE_OFFSET) && 589 __pa(PAGE_OFFSET) < end) 590 start = __pa(PAGE_OFFSET); 591 592 map_size = best_map_size(start, end - start); 593 for (pa = start; pa < end; pa += map_size) { 594 va = (uintptr_t)__va(pa); 595 create_pgd_mapping(swapper_pg_dir, va, pa, 596 map_size, PAGE_KERNEL_EXEC); 597 } 598 } 599 600 /* Clear fixmap PTE and PMD mappings */ 601 clear_fixmap(FIX_PTE); 602 clear_fixmap(FIX_PMD); 603 604 /* Move to swapper page table */ 605 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE); 606 local_flush_tlb_all(); 607 608 /* generic page allocation functions must be used to setup page table */ 609 pt_ops.alloc_pte = alloc_pte_late; 610 pt_ops.get_pte_virt = get_pte_virt_late; 611 #ifndef __PAGETABLE_PMD_FOLDED 612 pt_ops.alloc_pmd = alloc_pmd_late; 613 pt_ops.get_pmd_virt = get_pmd_virt_late; 614 #endif 615 } 616 #else 617 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 618 { 619 #ifdef CONFIG_BUILTIN_DTB 620 dtb_early_va = soc_lookup_builtin_dtb(); 621 if (!dtb_early_va) { 622 /* Fallback to first available DTS */ 623 dtb_early_va = (void *) __dtb_start; 624 } 625 #else 626 dtb_early_va = (void *)dtb_pa; 627 #endif 628 dtb_early_pa = dtb_pa; 629 } 630 631 static inline void setup_vm_final(void) 632 { 633 } 634 #endif /* CONFIG_MMU */ 635 636 #ifdef CONFIG_STRICT_KERNEL_RWX 637 void protect_kernel_text_data(void) 638 { 639 unsigned long text_start = (unsigned long)_start; 640 unsigned long init_text_start = (unsigned long)__init_text_begin; 641 unsigned long init_data_start = (unsigned long)__init_data_begin; 642 unsigned long rodata_start = (unsigned long)__start_rodata; 643 unsigned long data_start = (unsigned long)_data; 644 unsigned long max_low = (unsigned long)(__va(PFN_PHYS(max_low_pfn))); 645 646 set_memory_ro(text_start, (init_text_start - text_start) >> PAGE_SHIFT); 647 set_memory_ro(init_text_start, (init_data_start - init_text_start) >> PAGE_SHIFT); 648 set_memory_nx(init_data_start, (rodata_start - init_data_start) >> PAGE_SHIFT); 649 /* rodata section is marked readonly in mark_rodata_ro */ 650 set_memory_nx(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 651 set_memory_nx(data_start, (max_low - data_start) >> PAGE_SHIFT); 652 } 653 654 void mark_rodata_ro(void) 655 { 656 unsigned long rodata_start = (unsigned long)__start_rodata; 657 unsigned long data_start = (unsigned long)_data; 658 659 set_memory_ro(rodata_start, (data_start - rodata_start) >> PAGE_SHIFT); 660 661 debug_checkwx(); 662 } 663 #endif 664 665 void __init paging_init(void) 666 { 667 setup_vm_final(); 668 sparse_init(); 669 setup_zero_page(); 670 zone_sizes_init(); 671 } 672 673 #ifdef CONFIG_SPARSEMEM_VMEMMAP 674 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 675 struct vmem_altmap *altmap) 676 { 677 return vmemmap_populate_basepages(start, end, node, NULL); 678 } 679 #endif 680