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 * Copyright (C) 2020 FORTH-ICS/CARV 6 * Nick Kossifidis <mick@ics.forth.gr> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/mm.h> 11 #include <linux/memblock.h> 12 #include <linux/initrd.h> 13 #include <linux/swap.h> 14 #include <linux/swiotlb.h> 15 #include <linux/sizes.h> 16 #include <linux/of_fdt.h> 17 #include <linux/of_reserved_mem.h> 18 #include <linux/libfdt.h> 19 #include <linux/set_memory.h> 20 #include <linux/dma-map-ops.h> 21 #include <linux/crash_dump.h> 22 #include <linux/hugetlb.h> 23 #ifdef CONFIG_RELOCATABLE 24 #include <linux/elf.h> 25 #endif 26 #include <linux/kfence.h> 27 28 #include <asm/fixmap.h> 29 #include <asm/io.h> 30 #include <asm/numa.h> 31 #include <asm/pgtable.h> 32 #include <asm/ptdump.h> 33 #include <asm/sections.h> 34 #include <asm/soc.h> 35 #include <asm/sparsemem.h> 36 #include <asm/tlbflush.h> 37 38 #include "../kernel/head.h" 39 40 struct kernel_mapping kernel_map __ro_after_init; 41 EXPORT_SYMBOL(kernel_map); 42 #ifdef CONFIG_XIP_KERNEL 43 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map)) 44 #endif 45 46 #ifdef CONFIG_64BIT 47 u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39; 48 #else 49 u64 satp_mode __ro_after_init = SATP_MODE_32; 50 #endif 51 EXPORT_SYMBOL(satp_mode); 52 53 bool pgtable_l4_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL); 54 bool pgtable_l5_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL); 55 EXPORT_SYMBOL(pgtable_l4_enabled); 56 EXPORT_SYMBOL(pgtable_l5_enabled); 57 58 phys_addr_t phys_ram_base __ro_after_init; 59 EXPORT_SYMBOL(phys_ram_base); 60 61 #ifdef CONFIG_SPARSEMEM_VMEMMAP 62 #define VMEMMAP_ADDR_ALIGN (1ULL << SECTION_SIZE_BITS) 63 64 unsigned long vmemmap_start_pfn __ro_after_init; 65 EXPORT_SYMBOL(vmemmap_start_pfn); 66 #endif 67 68 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 69 __page_aligned_bss; 70 EXPORT_SYMBOL(empty_zero_page); 71 72 extern char _start[]; 73 void *_dtb_early_va __initdata; 74 uintptr_t _dtb_early_pa __initdata; 75 76 static phys_addr_t dma32_phys_limit __initdata; 77 zone_sizes_init(void)78 static void __init zone_sizes_init(void) 79 { 80 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 81 82 #ifdef CONFIG_ZONE_DMA32 83 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); 84 #endif 85 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 86 87 free_area_init(max_zone_pfns); 88 } 89 90 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 91 92 #define LOG2_SZ_1K ilog2(SZ_1K) 93 #define LOG2_SZ_1M ilog2(SZ_1M) 94 #define LOG2_SZ_1G ilog2(SZ_1G) 95 #define LOG2_SZ_1T ilog2(SZ_1T) 96 print_mlk(char * name,unsigned long b,unsigned long t)97 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 98 { 99 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 100 (((t) - (b)) >> LOG2_SZ_1K)); 101 } 102 print_mlm(char * name,unsigned long b,unsigned long t)103 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 104 { 105 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 106 (((t) - (b)) >> LOG2_SZ_1M)); 107 } 108 print_mlg(char * name,unsigned long b,unsigned long t)109 static inline void print_mlg(char *name, unsigned long b, unsigned long t) 110 { 111 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t, 112 (((t) - (b)) >> LOG2_SZ_1G)); 113 } 114 115 #ifdef CONFIG_64BIT print_mlt(char * name,unsigned long b,unsigned long t)116 static inline void print_mlt(char *name, unsigned long b, unsigned long t) 117 { 118 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t, 119 (((t) - (b)) >> LOG2_SZ_1T)); 120 } 121 #else 122 #define print_mlt(n, b, t) do {} while (0) 123 #endif 124 print_ml(char * name,unsigned long b,unsigned long t)125 static inline void print_ml(char *name, unsigned long b, unsigned long t) 126 { 127 unsigned long diff = t - b; 128 129 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10) 130 print_mlt(name, b, t); 131 else if ((diff >> LOG2_SZ_1G) >= 10) 132 print_mlg(name, b, t); 133 else if ((diff >> LOG2_SZ_1M) >= 10) 134 print_mlm(name, b, t); 135 else 136 print_mlk(name, b, t); 137 } 138 print_vm_layout(void)139 static void __init print_vm_layout(void) 140 { 141 pr_notice("Virtual kernel memory layout:\n"); 142 print_ml("fixmap", (unsigned long)FIXADDR_START, 143 (unsigned long)FIXADDR_TOP); 144 print_ml("pci io", (unsigned long)PCI_IO_START, 145 (unsigned long)PCI_IO_END); 146 print_ml("vmemmap", (unsigned long)VMEMMAP_START, 147 (unsigned long)VMEMMAP_END); 148 print_ml("vmalloc", (unsigned long)VMALLOC_START, 149 (unsigned long)VMALLOC_END); 150 #ifdef CONFIG_64BIT 151 print_ml("modules", (unsigned long)MODULES_VADDR, 152 (unsigned long)MODULES_END); 153 #endif 154 print_ml("lowmem", (unsigned long)PAGE_OFFSET, 155 (unsigned long)high_memory); 156 if (IS_ENABLED(CONFIG_64BIT)) { 157 #ifdef CONFIG_KASAN 158 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END); 159 #endif 160 161 print_ml("kernel", (unsigned long)kernel_map.virt_addr, 162 (unsigned long)ADDRESS_SPACE_END); 163 } 164 } 165 #else print_vm_layout(void)166 static void print_vm_layout(void) { } 167 #endif /* CONFIG_DEBUG_VM */ 168 mem_init(void)169 void __init mem_init(void) 170 { 171 #ifdef CONFIG_FLATMEM 172 BUG_ON(!mem_map); 173 #endif /* CONFIG_FLATMEM */ 174 175 swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE); 176 memblock_free_all(); 177 178 print_vm_layout(); 179 } 180 181 /* Limit the memory size via mem. */ 182 static phys_addr_t memory_limit; 183 #ifdef CONFIG_XIP_KERNEL 184 #define memory_limit (*(phys_addr_t *)XIP_FIXUP(&memory_limit)) 185 #endif /* CONFIG_XIP_KERNEL */ 186 early_mem(char * p)187 static int __init early_mem(char *p) 188 { 189 u64 size; 190 191 if (!p) 192 return 1; 193 194 size = memparse(p, &p) & PAGE_MASK; 195 memory_limit = min_t(u64, size, memory_limit); 196 197 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20); 198 199 return 0; 200 } 201 early_param("mem", early_mem); 202 setup_bootmem(void)203 static void __init setup_bootmem(void) 204 { 205 phys_addr_t vmlinux_end = __pa_symbol(&_end); 206 phys_addr_t max_mapped_addr; 207 phys_addr_t phys_ram_end, vmlinux_start; 208 209 if (IS_ENABLED(CONFIG_XIP_KERNEL)) 210 vmlinux_start = __pa_symbol(&_sdata); 211 else 212 vmlinux_start = __pa_symbol(&_start); 213 214 memblock_enforce_memory_limit(memory_limit); 215 216 /* 217 * Make sure we align the reservation on PMD_SIZE since we will 218 * map the kernel in the linear mapping as read-only: we do not want 219 * any allocation to happen between _end and the next pmd aligned page. 220 */ 221 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) 222 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK; 223 /* 224 * Reserve from the start of the kernel to the end of the kernel 225 */ 226 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 227 228 /* 229 * Make sure we align the start of the memory on a PMD boundary so that 230 * at worst, we map the linear mapping with PMD mappings. 231 */ 232 if (!IS_ENABLED(CONFIG_XIP_KERNEL)) { 233 phys_ram_base = memblock_start_of_DRAM() & PMD_MASK; 234 #ifdef CONFIG_SPARSEMEM_VMEMMAP 235 vmemmap_start_pfn = round_down(phys_ram_base, VMEMMAP_ADDR_ALIGN) >> PAGE_SHIFT; 236 #endif 237 } 238 239 /* 240 * In 64-bit, any use of __va/__pa before this point is wrong as we 241 * did not know the start of DRAM before. 242 */ 243 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) 244 kernel_map.va_pa_offset = PAGE_OFFSET - phys_ram_base; 245 246 /* 247 * The size of the linear page mapping may restrict the amount of 248 * usable RAM. 249 */ 250 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) { 251 max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE; 252 memblock_cap_memory_range(phys_ram_base, 253 max_mapped_addr - phys_ram_base); 254 } 255 256 /* 257 * Reserve physical address space that would be mapped to virtual 258 * addresses greater than (void *)(-PAGE_SIZE) because: 259 * - This memory would overlap with ERR_PTR 260 * - This memory belongs to high memory, which is not supported 261 * 262 * This is not applicable to 64-bit kernel, because virtual addresses 263 * after (void *)(-PAGE_SIZE) are not linearly mapped: they are 264 * occupied by kernel mapping. Also it is unrealistic for high memory 265 * to exist on 64-bit platforms. 266 */ 267 if (!IS_ENABLED(CONFIG_64BIT)) { 268 max_mapped_addr = __va_to_pa_nodebug(-PAGE_SIZE); 269 memblock_reserve(max_mapped_addr, (phys_addr_t)-max_mapped_addr); 270 } 271 272 phys_ram_end = memblock_end_of_DRAM(); 273 min_low_pfn = PFN_UP(phys_ram_base); 274 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end); 275 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 276 277 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 278 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); 279 280 reserve_initrd_mem(); 281 282 /* 283 * No allocation should be done before reserving the memory as defined 284 * in the device tree, otherwise the allocation could end up in a 285 * reserved region. 286 */ 287 early_init_fdt_scan_reserved_mem(); 288 289 /* 290 * If DTB is built in, no need to reserve its memblock. 291 * Otherwise, do reserve it but avoid using 292 * early_init_fdt_reserve_self() since __pa() does 293 * not work for DTB pointers that are fixmap addresses 294 */ 295 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) 296 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 297 298 dma_contiguous_reserve(dma32_phys_limit); 299 if (IS_ENABLED(CONFIG_64BIT)) 300 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 301 } 302 303 #ifdef CONFIG_MMU 304 struct pt_alloc_ops pt_ops __initdata; 305 306 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 307 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 308 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 309 310 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 311 312 #ifdef CONFIG_XIP_KERNEL 313 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops)) 314 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir)) 315 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte)) 316 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir)) 317 #endif /* CONFIG_XIP_KERNEL */ 318 319 static const pgprot_t protection_map[16] = { 320 [VM_NONE] = PAGE_NONE, 321 [VM_READ] = PAGE_READ, 322 [VM_WRITE] = PAGE_COPY, 323 [VM_WRITE | VM_READ] = PAGE_COPY, 324 [VM_EXEC] = PAGE_EXEC, 325 [VM_EXEC | VM_READ] = PAGE_READ_EXEC, 326 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC, 327 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC, 328 [VM_SHARED] = PAGE_NONE, 329 [VM_SHARED | VM_READ] = PAGE_READ, 330 [VM_SHARED | VM_WRITE] = PAGE_SHARED, 331 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, 332 [VM_SHARED | VM_EXEC] = PAGE_EXEC, 333 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC, 334 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC, 335 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC 336 }; 337 DECLARE_VM_GET_PAGE_PROT 338 __set_fixmap(enum fixed_addresses idx,phys_addr_t phys,pgprot_t prot)339 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 340 { 341 unsigned long addr = __fix_to_virt(idx); 342 pte_t *ptep; 343 344 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 345 346 ptep = &fixmap_pte[pte_index(addr)]; 347 348 if (pgprot_val(prot)) 349 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 350 else 351 pte_clear(&init_mm, addr, ptep); 352 local_flush_tlb_page(addr); 353 } 354 get_pte_virt_early(phys_addr_t pa)355 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 356 { 357 return (pte_t *)((uintptr_t)pa); 358 } 359 get_pte_virt_fixmap(phys_addr_t pa)360 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 361 { 362 clear_fixmap(FIX_PTE); 363 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 364 } 365 get_pte_virt_late(phys_addr_t pa)366 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa) 367 { 368 return (pte_t *) __va(pa); 369 } 370 alloc_pte_early(uintptr_t va)371 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 372 { 373 /* 374 * We only create PMD or PGD early mappings so we 375 * should never reach here with MMU disabled. 376 */ 377 BUG(); 378 } 379 alloc_pte_fixmap(uintptr_t va)380 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 381 { 382 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 383 } 384 alloc_pte_late(uintptr_t va)385 static phys_addr_t __init alloc_pte_late(uintptr_t va) 386 { 387 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0); 388 389 BUG_ON(!ptdesc || !pagetable_pte_ctor(ptdesc)); 390 return __pa((pte_t *)ptdesc_address(ptdesc)); 391 } 392 create_pte_mapping(pte_t * ptep,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)393 static void __init create_pte_mapping(pte_t *ptep, 394 uintptr_t va, phys_addr_t pa, 395 phys_addr_t sz, pgprot_t prot) 396 { 397 uintptr_t pte_idx = pte_index(va); 398 399 BUG_ON(sz != PAGE_SIZE); 400 401 if (pte_none(ptep[pte_idx])) 402 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 403 } 404 405 #ifndef __PAGETABLE_PMD_FOLDED 406 407 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 408 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 409 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 410 411 #ifdef CONFIG_XIP_KERNEL 412 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd)) 413 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd)) 414 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd)) 415 #endif /* CONFIG_XIP_KERNEL */ 416 417 static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss; 418 static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss; 419 static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 420 421 #ifdef CONFIG_XIP_KERNEL 422 #define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d)) 423 #define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d)) 424 #define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d)) 425 #endif /* CONFIG_XIP_KERNEL */ 426 427 static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss; 428 static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss; 429 static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); 430 431 #ifdef CONFIG_XIP_KERNEL 432 #define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud)) 433 #define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud)) 434 #define early_pud ((pud_t *)XIP_FIXUP(early_pud)) 435 #endif /* CONFIG_XIP_KERNEL */ 436 get_pmd_virt_early(phys_addr_t pa)437 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 438 { 439 /* Before MMU is enabled */ 440 return (pmd_t *)((uintptr_t)pa); 441 } 442 get_pmd_virt_fixmap(phys_addr_t pa)443 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 444 { 445 clear_fixmap(FIX_PMD); 446 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 447 } 448 get_pmd_virt_late(phys_addr_t pa)449 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa) 450 { 451 return (pmd_t *) __va(pa); 452 } 453 alloc_pmd_early(uintptr_t va)454 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 455 { 456 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT); 457 458 return (uintptr_t)early_pmd; 459 } 460 alloc_pmd_fixmap(uintptr_t va)461 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 462 { 463 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 464 } 465 alloc_pmd_late(uintptr_t va)466 static phys_addr_t __init alloc_pmd_late(uintptr_t va) 467 { 468 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL & ~__GFP_HIGHMEM, 0); 469 470 BUG_ON(!ptdesc || !pagetable_pmd_ctor(ptdesc)); 471 return __pa((pmd_t *)ptdesc_address(ptdesc)); 472 } 473 create_pmd_mapping(pmd_t * pmdp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)474 static void __init create_pmd_mapping(pmd_t *pmdp, 475 uintptr_t va, phys_addr_t pa, 476 phys_addr_t sz, pgprot_t prot) 477 { 478 pte_t *ptep; 479 phys_addr_t pte_phys; 480 uintptr_t pmd_idx = pmd_index(va); 481 482 if (sz == PMD_SIZE) { 483 if (pmd_none(pmdp[pmd_idx])) 484 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 485 return; 486 } 487 488 if (pmd_none(pmdp[pmd_idx])) { 489 pte_phys = pt_ops.alloc_pte(va); 490 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 491 ptep = pt_ops.get_pte_virt(pte_phys); 492 memset(ptep, 0, PAGE_SIZE); 493 } else { 494 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 495 ptep = pt_ops.get_pte_virt(pte_phys); 496 } 497 498 create_pte_mapping(ptep, va, pa, sz, prot); 499 } 500 get_pud_virt_early(phys_addr_t pa)501 static pud_t *__init get_pud_virt_early(phys_addr_t pa) 502 { 503 return (pud_t *)((uintptr_t)pa); 504 } 505 get_pud_virt_fixmap(phys_addr_t pa)506 static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa) 507 { 508 clear_fixmap(FIX_PUD); 509 return (pud_t *)set_fixmap_offset(FIX_PUD, pa); 510 } 511 get_pud_virt_late(phys_addr_t pa)512 static pud_t *__init get_pud_virt_late(phys_addr_t pa) 513 { 514 return (pud_t *)__va(pa); 515 } 516 alloc_pud_early(uintptr_t va)517 static phys_addr_t __init alloc_pud_early(uintptr_t va) 518 { 519 /* Only one PUD is available for early mapping */ 520 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 521 522 return (uintptr_t)early_pud; 523 } 524 alloc_pud_fixmap(uintptr_t va)525 static phys_addr_t __init alloc_pud_fixmap(uintptr_t va) 526 { 527 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 528 } 529 alloc_pud_late(uintptr_t va)530 static phys_addr_t alloc_pud_late(uintptr_t va) 531 { 532 unsigned long vaddr; 533 534 vaddr = __get_free_page(GFP_KERNEL); 535 BUG_ON(!vaddr); 536 return __pa(vaddr); 537 } 538 get_p4d_virt_early(phys_addr_t pa)539 static p4d_t *__init get_p4d_virt_early(phys_addr_t pa) 540 { 541 return (p4d_t *)((uintptr_t)pa); 542 } 543 get_p4d_virt_fixmap(phys_addr_t pa)544 static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa) 545 { 546 clear_fixmap(FIX_P4D); 547 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa); 548 } 549 get_p4d_virt_late(phys_addr_t pa)550 static p4d_t *__init get_p4d_virt_late(phys_addr_t pa) 551 { 552 return (p4d_t *)__va(pa); 553 } 554 alloc_p4d_early(uintptr_t va)555 static phys_addr_t __init alloc_p4d_early(uintptr_t va) 556 { 557 /* Only one P4D is available for early mapping */ 558 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 559 560 return (uintptr_t)early_p4d; 561 } 562 alloc_p4d_fixmap(uintptr_t va)563 static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va) 564 { 565 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 566 } 567 alloc_p4d_late(uintptr_t va)568 static phys_addr_t alloc_p4d_late(uintptr_t va) 569 { 570 unsigned long vaddr; 571 572 vaddr = __get_free_page(GFP_KERNEL); 573 BUG_ON(!vaddr); 574 return __pa(vaddr); 575 } 576 create_pud_mapping(pud_t * pudp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)577 static void __init create_pud_mapping(pud_t *pudp, 578 uintptr_t va, phys_addr_t pa, 579 phys_addr_t sz, pgprot_t prot) 580 { 581 pmd_t *nextp; 582 phys_addr_t next_phys; 583 uintptr_t pud_index = pud_index(va); 584 585 if (sz == PUD_SIZE) { 586 if (pud_val(pudp[pud_index]) == 0) 587 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot); 588 return; 589 } 590 591 if (pud_val(pudp[pud_index]) == 0) { 592 next_phys = pt_ops.alloc_pmd(va); 593 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE); 594 nextp = pt_ops.get_pmd_virt(next_phys); 595 memset(nextp, 0, PAGE_SIZE); 596 } else { 597 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index])); 598 nextp = pt_ops.get_pmd_virt(next_phys); 599 } 600 601 create_pmd_mapping(nextp, va, pa, sz, prot); 602 } 603 create_p4d_mapping(p4d_t * p4dp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)604 static void __init create_p4d_mapping(p4d_t *p4dp, 605 uintptr_t va, phys_addr_t pa, 606 phys_addr_t sz, pgprot_t prot) 607 { 608 pud_t *nextp; 609 phys_addr_t next_phys; 610 uintptr_t p4d_index = p4d_index(va); 611 612 if (sz == P4D_SIZE) { 613 if (p4d_val(p4dp[p4d_index]) == 0) 614 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot); 615 return; 616 } 617 618 if (p4d_val(p4dp[p4d_index]) == 0) { 619 next_phys = pt_ops.alloc_pud(va); 620 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE); 621 nextp = pt_ops.get_pud_virt(next_phys); 622 memset(nextp, 0, PAGE_SIZE); 623 } else { 624 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index])); 625 nextp = pt_ops.get_pud_virt(next_phys); 626 } 627 628 create_pud_mapping(nextp, va, pa, sz, prot); 629 } 630 631 #define pgd_next_t p4d_t 632 #define alloc_pgd_next(__va) (pgtable_l5_enabled ? \ 633 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \ 634 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va))) 635 #define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \ 636 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \ 637 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa))) 638 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 639 (pgtable_l5_enabled ? \ 640 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \ 641 (pgtable_l4_enabled ? \ 642 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \ 643 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot))) 644 #define fixmap_pgd_next (pgtable_l5_enabled ? \ 645 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \ 646 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd)) 647 #define trampoline_pgd_next (pgtable_l5_enabled ? \ 648 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \ 649 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd)) 650 #else 651 #define pgd_next_t pte_t 652 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 653 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 654 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 655 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 656 #define fixmap_pgd_next ((uintptr_t)fixmap_pte) 657 #define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 658 #define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 659 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 660 #endif /* __PAGETABLE_PMD_FOLDED */ 661 create_pgd_mapping(pgd_t * pgdp,uintptr_t va,phys_addr_t pa,phys_addr_t sz,pgprot_t prot)662 void __init create_pgd_mapping(pgd_t *pgdp, 663 uintptr_t va, phys_addr_t pa, 664 phys_addr_t sz, pgprot_t prot) 665 { 666 pgd_next_t *nextp; 667 phys_addr_t next_phys; 668 uintptr_t pgd_idx = pgd_index(va); 669 670 if (sz == PGDIR_SIZE) { 671 if (pgd_val(pgdp[pgd_idx]) == 0) 672 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 673 return; 674 } 675 676 if (pgd_val(pgdp[pgd_idx]) == 0) { 677 next_phys = alloc_pgd_next(va); 678 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 679 nextp = get_pgd_next_virt(next_phys); 680 memset(nextp, 0, PAGE_SIZE); 681 } else { 682 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 683 nextp = get_pgd_next_virt(next_phys); 684 } 685 686 create_pgd_next_mapping(nextp, va, pa, sz, prot); 687 } 688 best_map_size(phys_addr_t pa,uintptr_t va,phys_addr_t size)689 static uintptr_t __init best_map_size(phys_addr_t pa, uintptr_t va, 690 phys_addr_t size) 691 { 692 if (debug_pagealloc_enabled()) 693 return PAGE_SIZE; 694 695 if (pgtable_l5_enabled && 696 !(pa & (P4D_SIZE - 1)) && !(va & (P4D_SIZE - 1)) && size >= P4D_SIZE) 697 return P4D_SIZE; 698 699 if (pgtable_l4_enabled && 700 !(pa & (PUD_SIZE - 1)) && !(va & (PUD_SIZE - 1)) && size >= PUD_SIZE) 701 return PUD_SIZE; 702 703 if (IS_ENABLED(CONFIG_64BIT) && 704 !(pa & (PMD_SIZE - 1)) && !(va & (PMD_SIZE - 1)) && size >= PMD_SIZE) 705 return PMD_SIZE; 706 707 return PAGE_SIZE; 708 } 709 710 #ifdef CONFIG_XIP_KERNEL 711 #define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base)) 712 extern char _xiprom[], _exiprom[], __data_loc; 713 714 /* called from head.S with MMU off */ __copy_data(void)715 asmlinkage void __init __copy_data(void) 716 { 717 void *from = (void *)(&__data_loc); 718 void *to = (void *)CONFIG_PHYS_RAM_BASE; 719 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata)); 720 721 memcpy(to, from, sz); 722 } 723 #endif 724 725 #ifdef CONFIG_STRICT_KERNEL_RWX pgprot_from_va(uintptr_t va)726 static __init pgprot_t pgprot_from_va(uintptr_t va) 727 { 728 if (is_va_kernel_text(va)) 729 return PAGE_KERNEL_READ_EXEC; 730 731 /* 732 * In 64-bit kernel, the kernel mapping is outside the linear mapping so 733 * we must protect its linear mapping alias from being executed and 734 * written. 735 * And rodata section is marked readonly in mark_rodata_ro. 736 */ 737 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va)) 738 return PAGE_KERNEL_READ; 739 740 return PAGE_KERNEL; 741 } 742 mark_rodata_ro(void)743 void mark_rodata_ro(void) 744 { 745 set_kernel_memory(__start_rodata, _data, set_memory_ro); 746 if (IS_ENABLED(CONFIG_64BIT)) 747 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data), 748 set_memory_ro); 749 750 debug_checkwx(); 751 } 752 #else pgprot_from_va(uintptr_t va)753 static __init pgprot_t pgprot_from_va(uintptr_t va) 754 { 755 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va)) 756 return PAGE_KERNEL; 757 758 return PAGE_KERNEL_EXEC; 759 } 760 #endif /* CONFIG_STRICT_KERNEL_RWX */ 761 762 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) 763 u64 __pi_set_satp_mode_from_cmdline(uintptr_t dtb_pa); 764 disable_pgtable_l5(void)765 static void __init disable_pgtable_l5(void) 766 { 767 pgtable_l5_enabled = false; 768 kernel_map.page_offset = PAGE_OFFSET_L4; 769 satp_mode = SATP_MODE_48; 770 } 771 disable_pgtable_l4(void)772 static void __init disable_pgtable_l4(void) 773 { 774 pgtable_l4_enabled = false; 775 kernel_map.page_offset = PAGE_OFFSET_L3; 776 satp_mode = SATP_MODE_39; 777 } 778 print_no4lvl(char * p)779 static int __init print_no4lvl(char *p) 780 { 781 pr_info("Disabled 4-level and 5-level paging"); 782 return 0; 783 } 784 early_param("no4lvl", print_no4lvl); 785 print_no5lvl(char * p)786 static int __init print_no5lvl(char *p) 787 { 788 pr_info("Disabled 5-level paging"); 789 return 0; 790 } 791 early_param("no5lvl", print_no5lvl); 792 793 /* 794 * There is a simple way to determine if 4-level is supported by the 795 * underlying hardware: establish 1:1 mapping in 4-level page table mode 796 * then read SATP to see if the configuration was taken into account 797 * meaning sv48 is supported. 798 */ set_satp_mode(uintptr_t dtb_pa)799 static __init void set_satp_mode(uintptr_t dtb_pa) 800 { 801 u64 identity_satp, hw_satp; 802 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; 803 u64 satp_mode_cmdline = __pi_set_satp_mode_from_cmdline(dtb_pa); 804 805 if (satp_mode_cmdline == SATP_MODE_57) { 806 disable_pgtable_l5(); 807 } else if (satp_mode_cmdline == SATP_MODE_48) { 808 disable_pgtable_l5(); 809 disable_pgtable_l4(); 810 return; 811 } 812 813 create_p4d_mapping(early_p4d, 814 set_satp_mode_pmd, (uintptr_t)early_pud, 815 P4D_SIZE, PAGE_TABLE); 816 create_pud_mapping(early_pud, 817 set_satp_mode_pmd, (uintptr_t)early_pmd, 818 PUD_SIZE, PAGE_TABLE); 819 /* Handle the case where set_satp_mode straddles 2 PMDs */ 820 create_pmd_mapping(early_pmd, 821 set_satp_mode_pmd, set_satp_mode_pmd, 822 PMD_SIZE, PAGE_KERNEL_EXEC); 823 create_pmd_mapping(early_pmd, 824 set_satp_mode_pmd + PMD_SIZE, 825 set_satp_mode_pmd + PMD_SIZE, 826 PMD_SIZE, PAGE_KERNEL_EXEC); 827 retry: 828 create_pgd_mapping(early_pg_dir, 829 set_satp_mode_pmd, 830 pgtable_l5_enabled ? 831 (uintptr_t)early_p4d : (uintptr_t)early_pud, 832 PGDIR_SIZE, PAGE_TABLE); 833 834 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode; 835 836 local_flush_tlb_all(); 837 csr_write(CSR_SATP, identity_satp); 838 hw_satp = csr_swap(CSR_SATP, 0ULL); 839 local_flush_tlb_all(); 840 841 if (hw_satp != identity_satp) { 842 if (pgtable_l5_enabled) { 843 disable_pgtable_l5(); 844 memset(early_pg_dir, 0, PAGE_SIZE); 845 goto retry; 846 } 847 disable_pgtable_l4(); 848 } 849 850 memset(early_pg_dir, 0, PAGE_SIZE); 851 memset(early_p4d, 0, PAGE_SIZE); 852 memset(early_pud, 0, PAGE_SIZE); 853 memset(early_pmd, 0, PAGE_SIZE); 854 } 855 #endif 856 857 /* 858 * setup_vm() is called from head.S with MMU-off. 859 * 860 * Following requirements should be honoured for setup_vm() to work 861 * correctly: 862 * 1) It should use PC-relative addressing for accessing kernel symbols. 863 * To achieve this we always use GCC cmodel=medany. 864 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 865 * so disable compiler instrumentation when FTRACE is enabled. 866 * 867 * Currently, the above requirements are honoured by using custom CFLAGS 868 * for init.o in mm/Makefile. 869 */ 870 871 #ifndef __riscv_cmodel_medany 872 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 873 #endif 874 875 #ifdef CONFIG_RELOCATABLE 876 extern unsigned long __rela_dyn_start, __rela_dyn_end; 877 relocate_kernel(void)878 static void __init relocate_kernel(void) 879 { 880 Elf64_Rela *rela = (Elf64_Rela *)&__rela_dyn_start; 881 /* 882 * This holds the offset between the linked virtual address and the 883 * relocated virtual address. 884 */ 885 uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR; 886 /* 887 * This holds the offset between kernel linked virtual address and 888 * physical address. 889 */ 890 uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr; 891 892 for ( ; rela < (Elf64_Rela *)&__rela_dyn_end; rela++) { 893 Elf64_Addr addr = (rela->r_offset - va_kernel_link_pa_offset); 894 Elf64_Addr relocated_addr = rela->r_addend; 895 896 if (rela->r_info != R_RISCV_RELATIVE) 897 continue; 898 899 /* 900 * Make sure to not relocate vdso symbols like rt_sigreturn 901 * which are linked from the address 0 in vmlinux since 902 * vdso symbol addresses are actually used as an offset from 903 * mm->context.vdso in VDSO_OFFSET macro. 904 */ 905 if (relocated_addr >= KERNEL_LINK_ADDR) 906 relocated_addr += reloc_offset; 907 908 *(Elf64_Addr *)addr = relocated_addr; 909 } 910 } 911 #endif /* CONFIG_RELOCATABLE */ 912 913 #ifdef CONFIG_XIP_KERNEL create_kernel_page_table(pgd_t * pgdir,__always_unused bool early)914 static void __init create_kernel_page_table(pgd_t *pgdir, 915 __always_unused bool early) 916 { 917 uintptr_t va, end_va; 918 919 /* Map the flash resident part */ 920 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz; 921 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 922 create_pgd_mapping(pgdir, va, 923 kernel_map.xiprom + (va - kernel_map.virt_addr), 924 PMD_SIZE, PAGE_KERNEL_EXEC); 925 926 /* Map the data in RAM */ 927 end_va = kernel_map.virt_addr + kernel_map.size; 928 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE) 929 create_pgd_mapping(pgdir, va, 930 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)), 931 PMD_SIZE, PAGE_KERNEL); 932 } 933 #else create_kernel_page_table(pgd_t * pgdir,bool early)934 static void __init create_kernel_page_table(pgd_t *pgdir, bool early) 935 { 936 uintptr_t va, end_va; 937 938 end_va = kernel_map.virt_addr + kernel_map.size; 939 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 940 create_pgd_mapping(pgdir, va, 941 kernel_map.phys_addr + (va - kernel_map.virt_addr), 942 PMD_SIZE, 943 early ? 944 PAGE_KERNEL_EXEC : pgprot_from_va(va)); 945 } 946 #endif 947 948 /* 949 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel, 950 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR 951 * entry. 952 */ create_fdt_early_page_table(uintptr_t fix_fdt_va,uintptr_t dtb_pa)953 static void __init create_fdt_early_page_table(uintptr_t fix_fdt_va, 954 uintptr_t dtb_pa) 955 { 956 #ifndef CONFIG_BUILTIN_DTB 957 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1); 958 959 /* Make sure the fdt fixmap address is always aligned on PMD size */ 960 BUILD_BUG_ON(FIX_FDT % (PMD_SIZE / PAGE_SIZE)); 961 962 /* In 32-bit only, the fdt lies in its own PGD */ 963 if (!IS_ENABLED(CONFIG_64BIT)) { 964 create_pgd_mapping(early_pg_dir, fix_fdt_va, 965 pa, MAX_FDT_SIZE, PAGE_KERNEL); 966 } else { 967 create_pmd_mapping(fixmap_pmd, fix_fdt_va, 968 pa, PMD_SIZE, PAGE_KERNEL); 969 create_pmd_mapping(fixmap_pmd, fix_fdt_va + PMD_SIZE, 970 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 971 } 972 973 dtb_early_va = (void *)fix_fdt_va + (dtb_pa & (PMD_SIZE - 1)); 974 #else 975 /* 976 * For 64-bit kernel, __va can't be used since it would return a linear 977 * mapping address whereas dtb_early_va will be used before 978 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the 979 * kernel is mapped in the linear mapping, that makes no difference. 980 */ 981 dtb_early_va = kernel_mapping_pa_to_va(dtb_pa); 982 #endif 983 984 dtb_early_pa = dtb_pa; 985 } 986 987 /* 988 * MMU is not enabled, the page tables are allocated directly using 989 * early_pmd/pud/p4d and the address returned is the physical one. 990 */ pt_ops_set_early(void)991 static void __init pt_ops_set_early(void) 992 { 993 pt_ops.alloc_pte = alloc_pte_early; 994 pt_ops.get_pte_virt = get_pte_virt_early; 995 #ifndef __PAGETABLE_PMD_FOLDED 996 pt_ops.alloc_pmd = alloc_pmd_early; 997 pt_ops.get_pmd_virt = get_pmd_virt_early; 998 pt_ops.alloc_pud = alloc_pud_early; 999 pt_ops.get_pud_virt = get_pud_virt_early; 1000 pt_ops.alloc_p4d = alloc_p4d_early; 1001 pt_ops.get_p4d_virt = get_p4d_virt_early; 1002 #endif 1003 } 1004 1005 /* 1006 * MMU is enabled but page table setup is not complete yet. 1007 * fixmap page table alloc functions must be used as a means to temporarily 1008 * map the allocated physical pages since the linear mapping does not exist yet. 1009 * 1010 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va, 1011 * but it will be used as described above. 1012 */ pt_ops_set_fixmap(void)1013 static void __init pt_ops_set_fixmap(void) 1014 { 1015 pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap); 1016 pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap); 1017 #ifndef __PAGETABLE_PMD_FOLDED 1018 pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap); 1019 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap); 1020 pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap); 1021 pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap); 1022 pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap); 1023 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap); 1024 #endif 1025 } 1026 1027 /* 1028 * MMU is enabled and page table setup is complete, so from now, we can use 1029 * generic page allocation functions to setup page table. 1030 */ pt_ops_set_late(void)1031 static void __init pt_ops_set_late(void) 1032 { 1033 pt_ops.alloc_pte = alloc_pte_late; 1034 pt_ops.get_pte_virt = get_pte_virt_late; 1035 #ifndef __PAGETABLE_PMD_FOLDED 1036 pt_ops.alloc_pmd = alloc_pmd_late; 1037 pt_ops.get_pmd_virt = get_pmd_virt_late; 1038 pt_ops.alloc_pud = alloc_pud_late; 1039 pt_ops.get_pud_virt = get_pud_virt_late; 1040 pt_ops.alloc_p4d = alloc_p4d_late; 1041 pt_ops.get_p4d_virt = get_p4d_virt_late; 1042 #endif 1043 } 1044 1045 #ifdef CONFIG_RANDOMIZE_BASE 1046 extern bool __init __pi_set_nokaslr_from_cmdline(uintptr_t dtb_pa); 1047 extern u64 __init __pi_get_kaslr_seed(uintptr_t dtb_pa); 1048 print_nokaslr(char * p)1049 static int __init print_nokaslr(char *p) 1050 { 1051 pr_info("Disabled KASLR"); 1052 return 0; 1053 } 1054 early_param("nokaslr", print_nokaslr); 1055 kaslr_offset(void)1056 unsigned long kaslr_offset(void) 1057 { 1058 return kernel_map.virt_offset; 1059 } 1060 #endif 1061 setup_vm(uintptr_t dtb_pa)1062 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1063 { 1064 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd; 1065 1066 #ifdef CONFIG_RANDOMIZE_BASE 1067 if (!__pi_set_nokaslr_from_cmdline(dtb_pa)) { 1068 u64 kaslr_seed = __pi_get_kaslr_seed(dtb_pa); 1069 u32 kernel_size = (uintptr_t)(&_end) - (uintptr_t)(&_start); 1070 u32 nr_pos; 1071 1072 /* 1073 * Compute the number of positions available: we are limited 1074 * by the early page table that only has one PUD and we must 1075 * be aligned on PMD_SIZE. 1076 */ 1077 nr_pos = (PUD_SIZE - kernel_size) / PMD_SIZE; 1078 1079 kernel_map.virt_offset = (kaslr_seed % nr_pos) * PMD_SIZE; 1080 } 1081 #endif 1082 1083 kernel_map.virt_addr = KERNEL_LINK_ADDR + kernel_map.virt_offset; 1084 1085 #ifdef CONFIG_XIP_KERNEL 1086 #ifdef CONFIG_64BIT 1087 kernel_map.page_offset = PAGE_OFFSET_L3; 1088 #else 1089 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL); 1090 #endif 1091 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR; 1092 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom); 1093 1094 phys_ram_base = CONFIG_PHYS_RAM_BASE; 1095 #ifdef CONFIG_SPARSEMEM_VMEMMAP 1096 vmemmap_start_pfn = round_down(phys_ram_base, VMEMMAP_ADDR_ALIGN) >> PAGE_SHIFT; 1097 #endif 1098 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE; 1099 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_start); 1100 1101 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom; 1102 #else 1103 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL); 1104 kernel_map.phys_addr = (uintptr_t)(&_start); 1105 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr; 1106 #endif 1107 1108 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) 1109 set_satp_mode(dtb_pa); 1110 #endif 1111 1112 /* 1113 * In 64-bit, we defer the setup of va_pa_offset to setup_bootmem, 1114 * where we have the system memory layout: this allows us to align 1115 * the physical and virtual mappings and then make use of PUD/P4D/PGD 1116 * for the linear mapping. This is only possible because the kernel 1117 * mapping lies outside the linear mapping. 1118 * In 32-bit however, as the kernel resides in the linear mapping, 1119 * setup_vm_final can not change the mapping established here, 1120 * otherwise the same kernel addresses would get mapped to different 1121 * physical addresses (if the start of dram is different from the 1122 * kernel physical address start). 1123 */ 1124 kernel_map.va_pa_offset = IS_ENABLED(CONFIG_64BIT) ? 1125 0UL : PAGE_OFFSET - kernel_map.phys_addr; 1126 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr; 1127 1128 /* 1129 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit 1130 * kernel, whereas for 64-bit kernel, the end of the virtual address 1131 * space is occupied by the modules/BPF/kernel mappings which reduces 1132 * the available size of the linear mapping. 1133 */ 1134 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0); 1135 1136 /* Sanity check alignment and size */ 1137 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 1138 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0); 1139 1140 #ifdef CONFIG_64BIT 1141 /* 1142 * The last 4K bytes of the addressable memory can not be mapped because 1143 * of IS_ERR_VALUE macro. 1144 */ 1145 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K); 1146 #endif 1147 1148 #ifdef CONFIG_RELOCATABLE 1149 /* 1150 * Early page table uses only one PUD, which makes it possible 1151 * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset 1152 * makes the kernel cross over a PUD_SIZE boundary, raise a bug 1153 * since a part of the kernel would not get mapped. 1154 */ 1155 BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size); 1156 relocate_kernel(); 1157 #endif 1158 1159 apply_early_boot_alternatives(); 1160 pt_ops_set_early(); 1161 1162 /* Setup early PGD for fixmap */ 1163 create_pgd_mapping(early_pg_dir, FIXADDR_START, 1164 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 1165 1166 #ifndef __PAGETABLE_PMD_FOLDED 1167 /* Setup fixmap P4D and PUD */ 1168 if (pgtable_l5_enabled) 1169 create_p4d_mapping(fixmap_p4d, FIXADDR_START, 1170 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE); 1171 /* Setup fixmap PUD and PMD */ 1172 if (pgtable_l4_enabled) 1173 create_pud_mapping(fixmap_pud, FIXADDR_START, 1174 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE); 1175 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 1176 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 1177 /* Setup trampoline PGD and PMD */ 1178 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1179 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE); 1180 if (pgtable_l5_enabled) 1181 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr, 1182 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE); 1183 if (pgtable_l4_enabled) 1184 create_pud_mapping(trampoline_pud, kernel_map.virt_addr, 1185 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE); 1186 #ifdef CONFIG_XIP_KERNEL 1187 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 1188 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC); 1189 #else 1190 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 1191 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC); 1192 #endif 1193 #else 1194 /* Setup trampoline PGD */ 1195 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1196 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC); 1197 #endif 1198 1199 /* 1200 * Setup early PGD covering entire kernel which will allow 1201 * us to reach paging_init(). We map all memory banks later 1202 * in setup_vm_final() below. 1203 */ 1204 create_kernel_page_table(early_pg_dir, true); 1205 1206 /* Setup early mapping for FDT early scan */ 1207 create_fdt_early_page_table(__fix_to_virt(FIX_FDT), dtb_pa); 1208 1209 /* 1210 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 1211 * range can not span multiple pmds. 1212 */ 1213 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 1214 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 1215 1216 #ifndef __PAGETABLE_PMD_FOLDED 1217 /* 1218 * Early ioremap fixmap is already created as it lies within first 2MB 1219 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 1220 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 1221 * the user if not. 1222 */ 1223 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 1224 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 1225 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 1226 WARN_ON(1); 1227 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 1228 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 1229 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 1230 fix_to_virt(FIX_BTMAP_BEGIN)); 1231 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 1232 fix_to_virt(FIX_BTMAP_END)); 1233 1234 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 1235 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 1236 } 1237 #endif 1238 1239 pt_ops_set_fixmap(); 1240 } 1241 create_linear_mapping_range(phys_addr_t start,phys_addr_t end,uintptr_t fixed_map_size)1242 static void __init create_linear_mapping_range(phys_addr_t start, 1243 phys_addr_t end, 1244 uintptr_t fixed_map_size) 1245 { 1246 phys_addr_t pa; 1247 uintptr_t va, map_size; 1248 1249 for (pa = start; pa < end; pa += map_size) { 1250 va = (uintptr_t)__va(pa); 1251 map_size = fixed_map_size ? fixed_map_size : 1252 best_map_size(pa, va, end - pa); 1253 1254 create_pgd_mapping(swapper_pg_dir, va, pa, map_size, 1255 pgprot_from_va(va)); 1256 } 1257 } 1258 create_linear_mapping_page_table(void)1259 static void __init create_linear_mapping_page_table(void) 1260 { 1261 phys_addr_t start, end; 1262 phys_addr_t kfence_pool __maybe_unused; 1263 u64 i; 1264 1265 #ifdef CONFIG_STRICT_KERNEL_RWX 1266 phys_addr_t ktext_start = __pa_symbol(_start); 1267 phys_addr_t ktext_size = __init_data_begin - _start; 1268 phys_addr_t krodata_start = __pa_symbol(__start_rodata); 1269 phys_addr_t krodata_size = _data - __start_rodata; 1270 1271 /* Isolate kernel text and rodata so they don't get mapped with a PUD */ 1272 memblock_mark_nomap(ktext_start, ktext_size); 1273 memblock_mark_nomap(krodata_start, krodata_size); 1274 #endif 1275 1276 #ifdef CONFIG_KFENCE 1277 /* 1278 * kfence pool must be backed by PAGE_SIZE mappings, so allocate it 1279 * before we setup the linear mapping so that we avoid using hugepages 1280 * for this region. 1281 */ 1282 kfence_pool = memblock_phys_alloc(KFENCE_POOL_SIZE, PAGE_SIZE); 1283 BUG_ON(!kfence_pool); 1284 1285 memblock_mark_nomap(kfence_pool, KFENCE_POOL_SIZE); 1286 __kfence_pool = __va(kfence_pool); 1287 #endif 1288 1289 /* Map all memory banks in the linear mapping */ 1290 for_each_mem_range(i, &start, &end) { 1291 if (start >= end) 1292 break; 1293 if (start <= __pa(PAGE_OFFSET) && 1294 __pa(PAGE_OFFSET) < end) 1295 start = __pa(PAGE_OFFSET); 1296 1297 create_linear_mapping_range(start, end, 0); 1298 } 1299 1300 #ifdef CONFIG_STRICT_KERNEL_RWX 1301 create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0); 1302 create_linear_mapping_range(krodata_start, 1303 krodata_start + krodata_size, 0); 1304 1305 memblock_clear_nomap(ktext_start, ktext_size); 1306 memblock_clear_nomap(krodata_start, krodata_size); 1307 #endif 1308 1309 #ifdef CONFIG_KFENCE 1310 create_linear_mapping_range(kfence_pool, 1311 kfence_pool + KFENCE_POOL_SIZE, 1312 PAGE_SIZE); 1313 1314 memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE); 1315 #endif 1316 } 1317 setup_vm_final(void)1318 static void __init setup_vm_final(void) 1319 { 1320 /* Setup swapper PGD for fixmap */ 1321 #if !defined(CONFIG_64BIT) 1322 /* 1323 * In 32-bit, the device tree lies in a pgd entry, so it must be copied 1324 * directly in swapper_pg_dir in addition to the pgd entry that points 1325 * to fixmap_pte. 1326 */ 1327 unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT)); 1328 1329 set_pgd(&swapper_pg_dir[idx], early_pg_dir[idx]); 1330 #endif 1331 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 1332 __pa_symbol(fixmap_pgd_next), 1333 PGDIR_SIZE, PAGE_TABLE); 1334 1335 /* Map the linear mapping */ 1336 create_linear_mapping_page_table(); 1337 1338 /* Map the kernel */ 1339 if (IS_ENABLED(CONFIG_64BIT)) 1340 create_kernel_page_table(swapper_pg_dir, false); 1341 1342 #ifdef CONFIG_KASAN 1343 kasan_swapper_init(); 1344 #endif 1345 1346 /* Clear fixmap PTE and PMD mappings */ 1347 clear_fixmap(FIX_PTE); 1348 clear_fixmap(FIX_PMD); 1349 clear_fixmap(FIX_PUD); 1350 clear_fixmap(FIX_P4D); 1351 1352 /* Move to swapper page table */ 1353 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode); 1354 local_flush_tlb_all(); 1355 1356 pt_ops_set_late(); 1357 } 1358 #else setup_vm(uintptr_t dtb_pa)1359 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1360 { 1361 dtb_early_va = (void *)dtb_pa; 1362 dtb_early_pa = dtb_pa; 1363 } 1364 setup_vm_final(void)1365 static inline void setup_vm_final(void) 1366 { 1367 } 1368 #endif /* CONFIG_MMU */ 1369 1370 /* Reserve 128M low memory by default for swiotlb buffer */ 1371 #define DEFAULT_CRASH_KERNEL_LOW_SIZE (128UL << 20) 1372 reserve_crashkernel_low(unsigned long long low_size)1373 static int __init reserve_crashkernel_low(unsigned long long low_size) 1374 { 1375 unsigned long long low_base; 1376 1377 low_base = memblock_phys_alloc_range(low_size, PMD_SIZE, 0, dma32_phys_limit); 1378 if (!low_base) { 1379 pr_err("cannot allocate crashkernel low memory (size:0x%llx).\n", low_size); 1380 return -ENOMEM; 1381 } 1382 1383 pr_info("crashkernel low memory reserved: 0x%016llx - 0x%016llx (%lld MB)\n", 1384 low_base, low_base + low_size, low_size >> 20); 1385 1386 crashk_low_res.start = low_base; 1387 crashk_low_res.end = low_base + low_size - 1; 1388 1389 return 0; 1390 } 1391 1392 /* 1393 * reserve_crashkernel() - reserves memory for crash kernel 1394 * 1395 * This function reserves memory area given in "crashkernel=" kernel command 1396 * line parameter. The memory reserved is used by dump capture kernel when 1397 * primary kernel is crashing. 1398 */ reserve_crashkernel(void)1399 static void __init reserve_crashkernel(void) 1400 { 1401 unsigned long long crash_base = 0; 1402 unsigned long long crash_size = 0; 1403 unsigned long long crash_low_size = 0; 1404 unsigned long search_start = memblock_start_of_DRAM(); 1405 unsigned long search_end = (unsigned long)dma32_phys_limit; 1406 char *cmdline = boot_command_line; 1407 bool fixed_base = false; 1408 bool high = false; 1409 1410 int ret = 0; 1411 1412 if (!IS_ENABLED(CONFIG_KEXEC_CORE)) 1413 return; 1414 /* 1415 * Don't reserve a region for a crash kernel on a crash kernel 1416 * since it doesn't make much sense and we have limited memory 1417 * resources. 1418 */ 1419 if (is_kdump_kernel()) { 1420 pr_info("crashkernel: ignoring reservation request\n"); 1421 return; 1422 } 1423 1424 ret = parse_crashkernel(cmdline, memblock_phys_mem_size(), 1425 &crash_size, &crash_base); 1426 if (ret == -ENOENT) { 1427 /* Fallback to crashkernel=X,[high,low] */ 1428 ret = parse_crashkernel_high(cmdline, 0, &crash_size, &crash_base); 1429 if (ret || !crash_size) 1430 return; 1431 1432 /* 1433 * crashkernel=Y,low is valid only when crashkernel=X,high 1434 * is passed. 1435 */ 1436 ret = parse_crashkernel_low(cmdline, 0, &crash_low_size, &crash_base); 1437 if (ret == -ENOENT) 1438 crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE; 1439 else if (ret) 1440 return; 1441 1442 search_start = (unsigned long)dma32_phys_limit; 1443 search_end = memblock_end_of_DRAM(); 1444 high = true; 1445 } else if (ret || !crash_size) { 1446 /* Invalid argument value specified */ 1447 return; 1448 } 1449 1450 crash_size = PAGE_ALIGN(crash_size); 1451 1452 if (crash_base) { 1453 fixed_base = true; 1454 search_start = crash_base; 1455 search_end = crash_base + crash_size; 1456 } 1457 1458 /* 1459 * Current riscv boot protocol requires 2MB alignment for 1460 * RV64 and 4MB alignment for RV32 (hugepage size) 1461 * 1462 * Try to alloc from 32bit addressible physical memory so that 1463 * swiotlb can work on the crash kernel. 1464 */ 1465 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, 1466 search_start, search_end); 1467 if (crash_base == 0) { 1468 /* 1469 * For crashkernel=size[KMG]@offset[KMG], print out failure 1470 * message if can't reserve the specified region. 1471 */ 1472 if (fixed_base) { 1473 pr_warn("crashkernel: allocating failed with given size@offset\n"); 1474 return; 1475 } 1476 1477 if (high) { 1478 /* 1479 * For crashkernel=size[KMG],high, if the first attempt was 1480 * for high memory, fall back to low memory. 1481 */ 1482 search_start = memblock_start_of_DRAM(); 1483 search_end = (unsigned long)dma32_phys_limit; 1484 } else { 1485 /* 1486 * For crashkernel=size[KMG], if the first attempt was for 1487 * low memory, fall back to high memory, the minimum required 1488 * low memory will be reserved later. 1489 */ 1490 search_start = (unsigned long)dma32_phys_limit; 1491 search_end = memblock_end_of_DRAM(); 1492 crash_low_size = DEFAULT_CRASH_KERNEL_LOW_SIZE; 1493 } 1494 1495 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, 1496 search_start, search_end); 1497 if (crash_base == 0) { 1498 pr_warn("crashkernel: couldn't allocate %lldKB\n", 1499 crash_size >> 10); 1500 return; 1501 } 1502 } 1503 1504 if ((crash_base >= dma32_phys_limit) && crash_low_size && 1505 reserve_crashkernel_low(crash_low_size)) { 1506 memblock_phys_free(crash_base, crash_size); 1507 return; 1508 } 1509 1510 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n", 1511 crash_base, crash_base + crash_size, crash_size >> 20); 1512 1513 crashk_res.start = crash_base; 1514 crashk_res.end = crash_base + crash_size - 1; 1515 } 1516 paging_init(void)1517 void __init paging_init(void) 1518 { 1519 setup_bootmem(); 1520 setup_vm_final(); 1521 1522 /* Depend on that Linear Mapping is ready */ 1523 memblock_allow_resize(); 1524 } 1525 misc_mem_init(void)1526 void __init misc_mem_init(void) 1527 { 1528 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 1529 arch_numa_init(); 1530 sparse_init(); 1531 #ifdef CONFIG_SPARSEMEM_VMEMMAP 1532 /* The entire VMEMMAP region has been populated. Flush TLB for this region */ 1533 local_flush_tlb_kernel_range(VMEMMAP_START, VMEMMAP_END); 1534 #endif 1535 zone_sizes_init(); 1536 reserve_crashkernel(); 1537 memblock_dump_all(); 1538 } 1539 1540 #ifdef CONFIG_SPARSEMEM_VMEMMAP vmemmap_populate(unsigned long start,unsigned long end,int node,struct vmem_altmap * altmap)1541 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 1542 struct vmem_altmap *altmap) 1543 { 1544 return vmemmap_populate_basepages(start, end, node, NULL); 1545 } 1546 #endif 1547 1548 #if defined(CONFIG_MMU) && defined(CONFIG_64BIT) 1549 /* 1550 * Pre-allocates page-table pages for a specific area in the kernel 1551 * page-table. Only the level which needs to be synchronized between 1552 * all page-tables is allocated because the synchronization can be 1553 * expensive. 1554 */ preallocate_pgd_pages_range(unsigned long start,unsigned long end,const char * area)1555 static void __init preallocate_pgd_pages_range(unsigned long start, unsigned long end, 1556 const char *area) 1557 { 1558 unsigned long addr; 1559 const char *lvl; 1560 1561 for (addr = start; addr < end && addr >= start; addr = ALIGN(addr + 1, PGDIR_SIZE)) { 1562 pgd_t *pgd = pgd_offset_k(addr); 1563 p4d_t *p4d; 1564 pud_t *pud; 1565 pmd_t *pmd; 1566 1567 lvl = "p4d"; 1568 p4d = p4d_alloc(&init_mm, pgd, addr); 1569 if (!p4d) 1570 goto failed; 1571 1572 if (pgtable_l5_enabled) 1573 continue; 1574 1575 lvl = "pud"; 1576 pud = pud_alloc(&init_mm, p4d, addr); 1577 if (!pud) 1578 goto failed; 1579 1580 if (pgtable_l4_enabled) 1581 continue; 1582 1583 lvl = "pmd"; 1584 pmd = pmd_alloc(&init_mm, pud, addr); 1585 if (!pmd) 1586 goto failed; 1587 } 1588 return; 1589 1590 failed: 1591 /* 1592 * The pages have to be there now or they will be missing in 1593 * process page-tables later. 1594 */ 1595 panic("Failed to pre-allocate %s pages for %s area\n", lvl, area); 1596 } 1597 pgtable_cache_init(void)1598 void __init pgtable_cache_init(void) 1599 { 1600 preallocate_pgd_pages_range(VMALLOC_START, VMALLOC_END, "vmalloc"); 1601 if (IS_ENABLED(CONFIG_MODULES)) 1602 preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules"); 1603 } 1604 #endif 1605