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 #include <linux/kfence.h> 24 #include <linux/execmem.h> 25 26 #include <asm/alternative.h> 27 #include <asm/fixmap.h> 28 #include <asm/io.h> 29 #include <asm/kasan.h> 30 #include <asm/module.h> 31 #include <asm/numa.h> 32 #include <asm/pgtable.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 #if defined(CONFIG_64BIT) && defined(CONFIG_MMU) 41 DECLARE_BITMAP(new_valid_map_cpus, NR_CPUS); 42 #endif 43 44 struct kernel_mapping kernel_map __ro_after_init; 45 EXPORT_SYMBOL(kernel_map); 46 47 #ifdef CONFIG_64BIT 48 u64 satp_mode __ro_after_init = SATP_MODE_57; 49 #else 50 u64 satp_mode __ro_after_init = SATP_MODE_32; 51 #endif 52 EXPORT_SYMBOL(satp_mode); 53 54 #ifdef CONFIG_64BIT 55 bool pgtable_l4_enabled __ro_after_init = true; 56 bool pgtable_l5_enabled __ro_after_init = true; 57 EXPORT_SYMBOL(pgtable_l4_enabled); 58 EXPORT_SYMBOL(pgtable_l5_enabled); 59 #endif 60 61 phys_addr_t phys_ram_base __ro_after_init; 62 EXPORT_SYMBOL(phys_ram_base); 63 64 #ifdef CONFIG_SPARSEMEM_VMEMMAP 65 #define VMEMMAP_ADDR_ALIGN max(1ULL << SECTION_SIZE_BITS, \ 66 PFN_PHYS(MAX_FOLIO_VMEMMAP_ALIGN / \ 67 sizeof(struct page))) 68 69 unsigned long vmemmap_start_pfn __ro_after_init; 70 EXPORT_SYMBOL(vmemmap_start_pfn); 71 #endif 72 73 extern char _start[]; 74 void *_dtb_early_va __initdata; 75 uintptr_t _dtb_early_pa __initdata; 76 77 phys_addr_t dma32_phys_limit __initdata; 78 79 void __init arch_zone_limits_init(unsigned long *max_zone_pfns) 80 { 81 #ifdef CONFIG_ZONE_DMA32 82 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); 83 #endif 84 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 85 } 86 87 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 88 89 #define LOG2_SZ_1K ilog2(SZ_1K) 90 #define LOG2_SZ_1M ilog2(SZ_1M) 91 #define LOG2_SZ_1G ilog2(SZ_1G) 92 #define LOG2_SZ_1T ilog2(SZ_1T) 93 94 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 95 { 96 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 97 (((t) - (b)) >> LOG2_SZ_1K)); 98 } 99 100 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 101 { 102 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 103 (((t) - (b)) >> LOG2_SZ_1M)); 104 } 105 106 static inline void print_mlg(char *name, unsigned long b, unsigned long t) 107 { 108 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t, 109 (((t) - (b)) >> LOG2_SZ_1G)); 110 } 111 112 #ifdef CONFIG_64BIT 113 static inline void print_mlt(char *name, unsigned long b, unsigned long t) 114 { 115 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t, 116 (((t) - (b)) >> LOG2_SZ_1T)); 117 } 118 #else 119 #define print_mlt(n, b, t) do {} while (0) 120 #endif 121 122 static inline void print_ml(char *name, unsigned long b, unsigned long t) 123 { 124 unsigned long diff = t - b; 125 126 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10) 127 print_mlt(name, b, t); 128 else if ((diff >> LOG2_SZ_1G) >= 10) 129 print_mlg(name, b, t); 130 else if ((diff >> LOG2_SZ_1M) >= 10) 131 print_mlm(name, b, t); 132 else 133 print_mlk(name, b, t); 134 } 135 136 static void __init print_vm_layout(void) 137 { 138 pr_notice("Virtual kernel memory layout:\n"); 139 print_ml("fixmap", (unsigned long)FIXADDR_START, 140 (unsigned long)FIXADDR_TOP); 141 print_ml("pci io", (unsigned long)PCI_IO_START, 142 (unsigned long)PCI_IO_END); 143 print_ml("vmemmap", (unsigned long)VMEMMAP_START, 144 (unsigned long)VMEMMAP_END); 145 print_ml("vmalloc", (unsigned long)VMALLOC_START, 146 (unsigned long)VMALLOC_END); 147 #ifdef CONFIG_64BIT 148 print_ml("modules", (unsigned long)MODULES_VADDR, 149 (unsigned long)MODULES_END); 150 #endif 151 print_ml("lowmem", (unsigned long)PAGE_OFFSET, 152 (unsigned long)high_memory); 153 if (IS_ENABLED(CONFIG_64BIT)) { 154 #ifdef CONFIG_KASAN 155 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END); 156 #endif 157 158 print_ml("kernel", (unsigned long)kernel_map.virt_addr, 159 (unsigned long)ADDRESS_SPACE_END); 160 } 161 } 162 #else 163 static void print_vm_layout(void) { } 164 #endif /* CONFIG_DEBUG_VM */ 165 166 void __init arch_mm_preinit(void) 167 { 168 bool swiotlb = max_pfn > PFN_DOWN(dma32_phys_limit) && 169 memblock_start_of_DRAM() < dma32_phys_limit; 170 unsigned int swiotlb_flags = SWIOTLB_VERBOSE; 171 #ifdef CONFIG_FLATMEM 172 BUG_ON(!mem_map); 173 #endif /* CONFIG_FLATMEM */ 174 175 if (IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC) && !swiotlb && 176 dma_cache_alignment != 1) { 177 /* 178 * No 32-bit DMA bouncing needed (either all DRAM is within 179 * the 32-bit limit, or it all starts above it), but 180 * kmalloc() buffers whose sizes are not cache-line-aligned 181 * still require bouncing for non-coherent DMA. Use 182 * SWIOTLB_ANY so that the buffer can be allocated from high 183 * memory when DRAM starts above dma32_phys_limit. Allocate 184 * ~1 MB per 1 GB of RAM. 185 */ 186 unsigned long size = 187 DIV_ROUND_UP(memblock_phys_mem_size(), 1024); 188 swiotlb_adjust_size(min(swiotlb_size_or_default(), size)); 189 swiotlb = true; 190 swiotlb_flags |= SWIOTLB_ANY; 191 } 192 193 swiotlb_init(swiotlb, swiotlb_flags); 194 195 print_vm_layout(); 196 } 197 198 /* Limit the memory size via mem. */ 199 static phys_addr_t memory_limit; 200 201 static int __init early_mem(char *p) 202 { 203 u64 size; 204 205 if (!p) 206 return 1; 207 208 size = memparse(p, &p) & PAGE_MASK; 209 memory_limit = min_t(u64, size, memory_limit); 210 211 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20); 212 213 return 0; 214 } 215 early_param("mem", early_mem); 216 217 static void __init setup_bootmem(void) 218 { 219 phys_addr_t vmlinux_end = __pa_symbol(&_end); 220 phys_addr_t max_mapped_addr; 221 phys_addr_t phys_ram_end, vmlinux_start; 222 223 vmlinux_start = __pa_symbol(&_start); 224 225 memblock_enforce_memory_limit(memory_limit); 226 227 /* 228 * Make sure we align the reservation on PMD_SIZE since we will 229 * map the kernel in the linear mapping as read-only: we do not want 230 * any allocation to happen between _end and the next pmd aligned page. 231 */ 232 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) 233 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK; 234 /* 235 * Reserve from the start of the kernel to the end of the kernel 236 */ 237 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 238 239 /* 240 * Make sure we align the start of the memory on a PMD boundary so that 241 * at worst, we map the linear mapping with PMD mappings. 242 */ 243 phys_ram_base = memblock_start_of_DRAM() & PMD_MASK; 244 #ifdef CONFIG_SPARSEMEM_VMEMMAP 245 vmemmap_start_pfn = round_down(phys_ram_base, VMEMMAP_ADDR_ALIGN) >> PAGE_SHIFT; 246 #endif 247 248 /* 249 * In 64-bit, any use of __va/__pa before this point is wrong as we 250 * did not know the start of DRAM before. 251 */ 252 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) 253 kernel_map.va_pa_offset = PAGE_OFFSET - phys_ram_base; 254 255 /* 256 * The size of the linear page mapping may restrict the amount of 257 * usable RAM. 258 */ 259 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_MMU)) { 260 max_mapped_addr = __pa(PAGE_OFFSET) + KERN_VIRT_SIZE; 261 if (memblock_end_of_DRAM() > max_mapped_addr) { 262 memblock_cap_memory_range(phys_ram_base, 263 max_mapped_addr - phys_ram_base); 264 pr_warn("Physical memory overflows the linear mapping size: region above %pa removed", 265 &max_mapped_addr); 266 } 267 } 268 269 /* 270 * Reserve physical address space that would be mapped to virtual 271 * addresses greater than (void *)(-PAGE_SIZE) because: 272 * - This memory would overlap with ERR_PTR 273 * - This memory belongs to high memory, which is not supported 274 * 275 * This is not applicable to 64-bit kernel, because virtual addresses 276 * after (void *)(-PAGE_SIZE) are not linearly mapped: they are 277 * occupied by kernel mapping. Also it is unrealistic for high memory 278 * to exist on 64-bit platforms. 279 */ 280 if (!IS_ENABLED(CONFIG_64BIT)) { 281 max_mapped_addr = __va_to_pa_nodebug(-PAGE_SIZE); 282 memblock_reserve(max_mapped_addr, (phys_addr_t)-max_mapped_addr); 283 } 284 285 phys_ram_end = memblock_end_of_DRAM(); 286 min_low_pfn = PFN_UP(phys_ram_base); 287 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end); 288 289 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 290 291 reserve_initrd_mem(); 292 293 /* 294 * No allocation should be done before reserving the memory as defined 295 * in the device tree, otherwise the allocation could end up in a 296 * reserved region. 297 */ 298 early_init_fdt_scan_reserved_mem(); 299 300 /* 301 * If DTB is built in, no need to reserve its memblock. 302 * Otherwise, do reserve it but avoid using 303 * early_init_fdt_reserve_self() since __pa() does 304 * not work for DTB pointers that are fixmap addresses 305 */ 306 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) 307 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 308 309 dma_contiguous_reserve(dma32_phys_limit); 310 } 311 312 #ifdef CONFIG_RELOCATABLE 313 extern unsigned long __rela_dyn_start, __rela_dyn_end; 314 315 static void __init relocate_kernel(void) 316 { 317 Elf_Rela *rela = (Elf_Rela *)&__rela_dyn_start; 318 /* 319 * This holds the offset between the linked virtual address and the 320 * relocated virtual address. 321 */ 322 uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR; 323 /* 324 * This holds the offset between kernel linked virtual address and 325 * physical address. 326 */ 327 uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr; 328 329 for ( ; rela < (Elf_Rela *)&__rela_dyn_end; rela++) { 330 Elf_Addr addr = (rela->r_offset - va_kernel_link_pa_offset); 331 Elf_Addr relocated_addr = rela->r_addend; 332 333 if (rela->r_info != R_RISCV_RELATIVE) 334 continue; 335 336 /* 337 * Make sure to not relocate vdso symbols like rt_sigreturn 338 * which are linked from the address 0 in vmlinux since 339 * vdso symbol addresses are actually used as an offset from 340 * mm->context.vdso in VDSO_OFFSET macro. 341 */ 342 if (relocated_addr >= KERNEL_LINK_ADDR) 343 relocated_addr += reloc_offset; 344 345 *(Elf_Addr *)addr = relocated_addr; 346 } 347 } 348 #endif /* CONFIG_RELOCATABLE */ 349 350 #ifdef CONFIG_MMU 351 struct pt_alloc_ops pt_ops __meminitdata; 352 353 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 354 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 355 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 356 357 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 358 359 static const pgprot_t protection_map[16] = { 360 [VM_NONE] = PAGE_NONE, 361 [VM_READ] = PAGE_READ, 362 [VM_WRITE] = PAGE_SHADOWSTACK, 363 [VM_WRITE | VM_READ] = PAGE_COPY, 364 [VM_EXEC] = PAGE_EXEC, 365 [VM_EXEC | VM_READ] = PAGE_READ_EXEC, 366 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC, 367 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_EXEC, 368 [VM_SHARED] = PAGE_NONE, 369 [VM_SHARED | VM_READ] = PAGE_READ, 370 [VM_SHARED | VM_WRITE] = PAGE_SHARED, 371 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, 372 [VM_SHARED | VM_EXEC] = PAGE_EXEC, 373 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC, 374 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC, 375 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC 376 }; 377 DECLARE_VM_GET_PAGE_PROT 378 379 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 380 { 381 unsigned long addr = __fix_to_virt(idx); 382 pte_t *ptep; 383 384 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 385 386 ptep = &fixmap_pte[pte_index(addr)]; 387 388 if (pgprot_val(prot)) 389 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 390 else 391 pte_clear(&init_mm, addr, ptep); 392 local_flush_tlb_page(addr); 393 } 394 395 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 396 { 397 return (pte_t *)((uintptr_t)pa); 398 } 399 400 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 401 { 402 clear_fixmap(FIX_PTE); 403 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 404 } 405 406 static inline pte_t *__meminit get_pte_virt_late(phys_addr_t pa) 407 { 408 return (pte_t *) __va(pa); 409 } 410 411 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 412 { 413 /* 414 * We only create PMD or PGD early mappings so we 415 * should never reach here with MMU disabled. 416 */ 417 BUG(); 418 } 419 420 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 421 { 422 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 423 } 424 425 static phys_addr_t __meminit alloc_pte_late(uintptr_t va) 426 { 427 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0); 428 429 /* 430 * We do not know which mm the PTE page is associated to at this point. 431 * Passing NULL to the ctor is the safe option, though it may result 432 * in unnecessary work (e.g. initialising the ptlock for init_mm). 433 */ 434 BUG_ON(!ptdesc || !pagetable_pte_ctor(NULL, ptdesc)); 435 return __pa((pte_t *)ptdesc_address(ptdesc)); 436 } 437 438 static void __meminit create_pte_mapping(pte_t *ptep, uintptr_t va, phys_addr_t pa, phys_addr_t sz, 439 pgprot_t prot) 440 { 441 uintptr_t pte_idx = pte_index(va); 442 443 BUG_ON(sz != PAGE_SIZE); 444 445 if (pte_none(ptep[pte_idx])) 446 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 447 } 448 449 #ifndef __PAGETABLE_PMD_FOLDED 450 451 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 452 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 453 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 454 455 static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss; 456 static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss; 457 static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 458 459 static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss; 460 static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss; 461 static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); 462 463 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 464 { 465 /* Before MMU is enabled */ 466 return (pmd_t *)((uintptr_t)pa); 467 } 468 469 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 470 { 471 clear_fixmap(FIX_PMD); 472 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 473 } 474 475 static pmd_t *__meminit get_pmd_virt_late(phys_addr_t pa) 476 { 477 return (pmd_t *) __va(pa); 478 } 479 480 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 481 { 482 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT); 483 484 return (uintptr_t)early_pmd; 485 } 486 487 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 488 { 489 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 490 } 491 492 static phys_addr_t __meminit alloc_pmd_late(uintptr_t va) 493 { 494 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0); 495 496 /* See comment in alloc_pte_late() regarding NULL passed the ctor */ 497 BUG_ON(!ptdesc || !pagetable_pmd_ctor(NULL, ptdesc)); 498 return __pa((pmd_t *)ptdesc_address(ptdesc)); 499 } 500 501 static void __meminit create_pmd_mapping(pmd_t *pmdp, 502 uintptr_t va, phys_addr_t pa, 503 phys_addr_t sz, pgprot_t prot) 504 { 505 pte_t *ptep; 506 phys_addr_t pte_phys; 507 uintptr_t pmd_idx = pmd_index(va); 508 509 if (sz == PMD_SIZE) { 510 if (pmd_none(pmdp[pmd_idx])) 511 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 512 return; 513 } 514 515 if (pmd_none(pmdp[pmd_idx])) { 516 pte_phys = pt_ops.alloc_pte(va); 517 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 518 ptep = pt_ops.get_pte_virt(pte_phys); 519 memset(ptep, 0, PAGE_SIZE); 520 } else { 521 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 522 ptep = pt_ops.get_pte_virt(pte_phys); 523 } 524 525 create_pte_mapping(ptep, va, pa, sz, prot); 526 } 527 528 static pud_t *__init get_pud_virt_early(phys_addr_t pa) 529 { 530 return (pud_t *)((uintptr_t)pa); 531 } 532 533 static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa) 534 { 535 clear_fixmap(FIX_PUD); 536 return (pud_t *)set_fixmap_offset(FIX_PUD, pa); 537 } 538 539 static pud_t *__meminit get_pud_virt_late(phys_addr_t pa) 540 { 541 return (pud_t *)__va(pa); 542 } 543 544 static phys_addr_t __init alloc_pud_early(uintptr_t va) 545 { 546 /* Only one PUD is available for early mapping */ 547 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 548 549 return (uintptr_t)early_pud; 550 } 551 552 static phys_addr_t __init alloc_pud_fixmap(uintptr_t va) 553 { 554 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 555 } 556 557 static phys_addr_t __meminit alloc_pud_late(uintptr_t va) 558 { 559 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0); 560 561 BUG_ON(!ptdesc); 562 pagetable_pud_ctor(ptdesc); 563 return __pa((pud_t *)ptdesc_address(ptdesc)); 564 } 565 566 static p4d_t *__init get_p4d_virt_early(phys_addr_t pa) 567 { 568 return (p4d_t *)((uintptr_t)pa); 569 } 570 571 static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa) 572 { 573 clear_fixmap(FIX_P4D); 574 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa); 575 } 576 577 static p4d_t *__meminit get_p4d_virt_late(phys_addr_t pa) 578 { 579 return (p4d_t *)__va(pa); 580 } 581 582 static phys_addr_t __init alloc_p4d_early(uintptr_t va) 583 { 584 /* Only one P4D is available for early mapping */ 585 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 586 587 return (uintptr_t)early_p4d; 588 } 589 590 static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va) 591 { 592 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 593 } 594 595 static phys_addr_t __meminit alloc_p4d_late(uintptr_t va) 596 { 597 struct ptdesc *ptdesc = pagetable_alloc(GFP_KERNEL, 0); 598 599 BUG_ON(!ptdesc); 600 pagetable_p4d_ctor(ptdesc); 601 return __pa((p4d_t *)ptdesc_address(ptdesc)); 602 } 603 604 static void __meminit create_pud_mapping(pud_t *pudp, uintptr_t va, phys_addr_t pa, phys_addr_t sz, 605 pgprot_t prot) 606 { 607 pmd_t *nextp; 608 phys_addr_t next_phys; 609 uintptr_t pud_index = pud_index(va); 610 611 if (sz == PUD_SIZE) { 612 if (pud_val(pudp[pud_index]) == 0) 613 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot); 614 return; 615 } 616 617 if (pud_val(pudp[pud_index]) == 0) { 618 next_phys = pt_ops.alloc_pmd(va); 619 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE); 620 nextp = pt_ops.get_pmd_virt(next_phys); 621 memset(nextp, 0, PAGE_SIZE); 622 } else { 623 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index])); 624 nextp = pt_ops.get_pmd_virt(next_phys); 625 } 626 627 create_pmd_mapping(nextp, va, pa, sz, prot); 628 } 629 630 static void __meminit create_p4d_mapping(p4d_t *p4dp, uintptr_t va, phys_addr_t pa, phys_addr_t sz, 631 pgprot_t prot) 632 { 633 pud_t *nextp; 634 phys_addr_t next_phys; 635 uintptr_t p4d_index = p4d_index(va); 636 637 if (sz == P4D_SIZE) { 638 if (p4d_val(p4dp[p4d_index]) == 0) 639 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot); 640 return; 641 } 642 643 if (p4d_val(p4dp[p4d_index]) == 0) { 644 next_phys = pt_ops.alloc_pud(va); 645 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE); 646 nextp = pt_ops.get_pud_virt(next_phys); 647 memset(nextp, 0, PAGE_SIZE); 648 } else { 649 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index])); 650 nextp = pt_ops.get_pud_virt(next_phys); 651 } 652 653 create_pud_mapping(nextp, va, pa, sz, prot); 654 } 655 656 #define pgd_next_t p4d_t 657 #define alloc_pgd_next(__va) (pgtable_l5_enabled ? \ 658 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \ 659 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va))) 660 #define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \ 661 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \ 662 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa))) 663 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 664 (pgtable_l5_enabled ? \ 665 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \ 666 (pgtable_l4_enabled ? \ 667 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \ 668 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot))) 669 #define fixmap_pgd_next (pgtable_l5_enabled ? \ 670 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \ 671 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd)) 672 #define trampoline_pgd_next (pgtable_l5_enabled ? \ 673 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \ 674 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd)) 675 #else 676 #define pgd_next_t pte_t 677 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 678 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 679 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 680 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 681 #define fixmap_pgd_next ((uintptr_t)fixmap_pte) 682 #define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 683 #define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 684 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 685 #endif /* __PAGETABLE_PMD_FOLDED */ 686 687 void __meminit create_pgd_mapping(pgd_t *pgdp, uintptr_t va, phys_addr_t pa, phys_addr_t sz, 688 pgprot_t prot) 689 { 690 pgd_next_t *nextp; 691 phys_addr_t next_phys; 692 uintptr_t pgd_idx = pgd_index(va); 693 694 if (sz == PGDIR_SIZE) { 695 if (pgd_val(pgdp[pgd_idx]) == 0) 696 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 697 return; 698 } 699 700 if (pgd_val(pgdp[pgd_idx]) == 0) { 701 next_phys = alloc_pgd_next(va); 702 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 703 nextp = get_pgd_next_virt(next_phys); 704 memset(nextp, 0, PAGE_SIZE); 705 } else { 706 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 707 nextp = get_pgd_next_virt(next_phys); 708 } 709 710 create_pgd_next_mapping(nextp, va, pa, sz, prot); 711 } 712 713 static uintptr_t __meminit best_map_size(phys_addr_t pa, uintptr_t va, phys_addr_t size) 714 { 715 if (debug_pagealloc_enabled()) 716 return PAGE_SIZE; 717 718 if (pgtable_l5_enabled && 719 !(pa & (P4D_SIZE - 1)) && !(va & (P4D_SIZE - 1)) && size >= P4D_SIZE) 720 return P4D_SIZE; 721 722 if (pgtable_l4_enabled && 723 !(pa & (PUD_SIZE - 1)) && !(va & (PUD_SIZE - 1)) && size >= PUD_SIZE) 724 return PUD_SIZE; 725 726 if (IS_ENABLED(CONFIG_64BIT) && 727 !(pa & (PMD_SIZE - 1)) && !(va & (PMD_SIZE - 1)) && size >= PMD_SIZE) 728 return PMD_SIZE; 729 730 return PAGE_SIZE; 731 } 732 733 #ifdef CONFIG_STRICT_KERNEL_RWX 734 static __meminit pgprot_t pgprot_from_va(uintptr_t va) 735 { 736 if (is_va_kernel_text(va)) 737 return PAGE_KERNEL_READ_EXEC; 738 739 /* 740 * In 64-bit kernel, the kernel mapping is outside the linear mapping so 741 * we must protect its linear mapping alias from being executed and 742 * written. 743 * And rodata section is marked readonly in mark_rodata_ro. 744 */ 745 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va)) 746 return PAGE_KERNEL_READ; 747 748 return PAGE_KERNEL; 749 } 750 751 void mark_rodata_ro(void) 752 { 753 set_kernel_memory(__start_rodata, _data, set_memory_ro); 754 if (IS_ENABLED(CONFIG_64BIT)) 755 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data), 756 set_memory_ro); 757 } 758 #else 759 static __meminit pgprot_t pgprot_from_va(uintptr_t va) 760 { 761 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va)) 762 return PAGE_KERNEL; 763 764 return PAGE_KERNEL_EXEC; 765 } 766 #endif /* CONFIG_STRICT_KERNEL_RWX */ 767 768 #if defined(CONFIG_64BIT) 769 u64 __pi_set_satp_mode_from_cmdline(uintptr_t dtb_pa); 770 u64 __pi_set_satp_mode_from_fdt(uintptr_t dtb_pa); 771 772 static void __init disable_pgtable_l5(void) 773 { 774 pgtable_l5_enabled = false; 775 kernel_map.page_offset = PAGE_OFFSET_L4; 776 satp_mode = SATP_MODE_48; 777 } 778 779 static void __init disable_pgtable_l4(void) 780 { 781 pgtable_l4_enabled = false; 782 kernel_map.page_offset = PAGE_OFFSET_L3; 783 satp_mode = SATP_MODE_39; 784 } 785 786 static int __init print_no4lvl(char *p) 787 { 788 pr_info("Disabled 4-level and 5-level paging"); 789 return 0; 790 } 791 early_param("no4lvl", print_no4lvl); 792 793 static int __init print_no5lvl(char *p) 794 { 795 pr_info("Disabled 5-level paging"); 796 return 0; 797 } 798 early_param("no5lvl", print_no5lvl); 799 800 static void __init set_mmap_rnd_bits_max(void) 801 { 802 mmap_rnd_bits_max = MMAP_VA_BITS - PAGE_SHIFT - 3; 803 } 804 805 static bool __init is_vaddr_valid(unsigned long va) 806 { 807 unsigned long up = 0; 808 809 switch (satp_mode) { 810 case SATP_MODE_39: 811 up = 1UL << 38; 812 break; 813 case SATP_MODE_48: 814 up = 1UL << 47; 815 break; 816 case SATP_MODE_57: 817 up = 1UL << 56; 818 break; 819 default: 820 return false; 821 } 822 823 return (va < up) || (va >= (ULONG_MAX - up + 1)); 824 } 825 826 /* 827 * There is a simple way to determine if 4-level is supported by the 828 * underlying hardware: establish 1:1 mapping in 4-level page table mode 829 * then read SATP to see if the configuration was taken into account 830 * meaning sv48 is supported. 831 * The maximum SATP mode is limited by both the command line and the "mmu-type" 832 * property in the device tree, since some platforms may hang if an unsupported 833 * SATP mode is attempted. 834 */ 835 static __init void set_satp_mode(uintptr_t dtb_pa) 836 { 837 u64 identity_satp, hw_satp; 838 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; 839 u64 satp_mode_limit = min_not_zero(__pi_set_satp_mode_from_cmdline(dtb_pa), 840 __pi_set_satp_mode_from_fdt(dtb_pa)); 841 842 kernel_map.page_offset = PAGE_OFFSET_L5; 843 844 if (satp_mode_limit == SATP_MODE_48) { 845 disable_pgtable_l5(); 846 } else if (satp_mode_limit == SATP_MODE_39) { 847 disable_pgtable_l5(); 848 disable_pgtable_l4(); 849 return; 850 } 851 852 create_p4d_mapping(early_p4d, 853 set_satp_mode_pmd, (uintptr_t)early_pud, 854 P4D_SIZE, PAGE_TABLE); 855 create_pud_mapping(early_pud, 856 set_satp_mode_pmd, (uintptr_t)early_pmd, 857 PUD_SIZE, PAGE_TABLE); 858 /* Handle the case where set_satp_mode straddles 2 PMDs */ 859 create_pmd_mapping(early_pmd, 860 set_satp_mode_pmd, set_satp_mode_pmd, 861 PMD_SIZE, PAGE_KERNEL_EXEC); 862 create_pmd_mapping(early_pmd, 863 set_satp_mode_pmd + PMD_SIZE, 864 set_satp_mode_pmd + PMD_SIZE, 865 PMD_SIZE, PAGE_KERNEL_EXEC); 866 retry: 867 if (!is_vaddr_valid(set_satp_mode_pmd)) 868 goto out; 869 870 create_pgd_mapping(early_pg_dir, 871 set_satp_mode_pmd, 872 pgtable_l5_enabled ? 873 (uintptr_t)early_p4d : (uintptr_t)early_pud, 874 PGDIR_SIZE, PAGE_TABLE); 875 876 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode; 877 878 local_flush_tlb_all(); 879 csr_write(CSR_SATP, identity_satp); 880 hw_satp = csr_swap(CSR_SATP, 0ULL); 881 local_flush_tlb_all(); 882 883 if (hw_satp != identity_satp) { 884 if (pgtable_l5_enabled) { 885 disable_pgtable_l5(); 886 memset(early_pg_dir, 0, PAGE_SIZE); 887 goto retry; 888 } 889 disable_pgtable_l4(); 890 } 891 892 out: 893 memset(early_pg_dir, 0, PAGE_SIZE); 894 memset(early_p4d, 0, PAGE_SIZE); 895 memset(early_pud, 0, PAGE_SIZE); 896 memset(early_pmd, 0, PAGE_SIZE); 897 } 898 #endif 899 900 /* 901 * setup_vm() is called from head.S with MMU-off. 902 * 903 * Following requirements should be honoured for setup_vm() to work 904 * correctly: 905 * 1) It should use PC-relative addressing for accessing kernel symbols. 906 * To achieve this we always use GCC cmodel=medany. 907 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 908 * so disable compiler instrumentation when FTRACE is enabled. 909 * 910 * Currently, the above requirements are honoured by using custom CFLAGS 911 * for init.o in mm/Makefile. 912 */ 913 914 #ifndef __riscv_cmodel_medany 915 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 916 #endif 917 918 static void __init create_kernel_page_table(pgd_t *pgdir, bool early) 919 { 920 uintptr_t va, end_va; 921 922 end_va = kernel_map.virt_addr + kernel_map.size; 923 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 924 create_pgd_mapping(pgdir, va, 925 kernel_map.phys_addr + (va - kernel_map.virt_addr), 926 PMD_SIZE, 927 early ? 928 PAGE_KERNEL_EXEC : pgprot_from_va(va)); 929 } 930 931 /* 932 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel, 933 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR 934 * entry. 935 */ 936 static void __init create_fdt_early_page_table(uintptr_t fix_fdt_va, 937 uintptr_t dtb_pa) 938 { 939 #ifndef CONFIG_BUILTIN_DTB 940 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1); 941 942 /* Make sure the fdt fixmap address is always aligned on PMD size */ 943 BUILD_BUG_ON(FIX_FDT % (PMD_SIZE / PAGE_SIZE)); 944 945 /* In 32-bit only, the fdt lies in its own PGD */ 946 if (!IS_ENABLED(CONFIG_64BIT)) { 947 create_pgd_mapping(early_pg_dir, fix_fdt_va, 948 pa, MAX_FDT_SIZE, PAGE_KERNEL); 949 } else { 950 create_pmd_mapping(fixmap_pmd, fix_fdt_va, 951 pa, PMD_SIZE, PAGE_KERNEL); 952 create_pmd_mapping(fixmap_pmd, fix_fdt_va + PMD_SIZE, 953 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 954 } 955 956 dtb_early_va = (void *)fix_fdt_va + (dtb_pa & (PMD_SIZE - 1)); 957 #else 958 /* 959 * For 64-bit kernel, __va can't be used since it would return a linear 960 * mapping address whereas dtb_early_va will be used before 961 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the 962 * kernel is mapped in the linear mapping, that makes no difference. 963 */ 964 dtb_early_va = kernel_mapping_pa_to_va(dtb_pa); 965 #endif 966 967 dtb_early_pa = dtb_pa; 968 } 969 970 /* 971 * MMU is not enabled, the page tables are allocated directly using 972 * early_pmd/pud/p4d and the address returned is the physical one. 973 */ 974 static void __init pt_ops_set_early(void) 975 { 976 pt_ops.alloc_pte = alloc_pte_early; 977 pt_ops.get_pte_virt = get_pte_virt_early; 978 #ifndef __PAGETABLE_PMD_FOLDED 979 pt_ops.alloc_pmd = alloc_pmd_early; 980 pt_ops.get_pmd_virt = get_pmd_virt_early; 981 pt_ops.alloc_pud = alloc_pud_early; 982 pt_ops.get_pud_virt = get_pud_virt_early; 983 pt_ops.alloc_p4d = alloc_p4d_early; 984 pt_ops.get_p4d_virt = get_p4d_virt_early; 985 #endif 986 } 987 988 /* 989 * MMU is enabled but page table setup is not complete yet. 990 * fixmap page table alloc functions must be used as a means to temporarily 991 * map the allocated physical pages since the linear mapping does not exist yet. 992 * 993 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va, 994 * but it will be used as described above. 995 */ 996 static void __init pt_ops_set_fixmap(void) 997 { 998 pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap); 999 pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap); 1000 #ifndef __PAGETABLE_PMD_FOLDED 1001 pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap); 1002 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap); 1003 pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap); 1004 pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap); 1005 pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap); 1006 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap); 1007 #endif 1008 } 1009 1010 /* 1011 * MMU is enabled and page table setup is complete, so from now, we can use 1012 * generic page allocation functions to setup page table. 1013 */ 1014 static void __init pt_ops_set_late(void) 1015 { 1016 pt_ops.alloc_pte = alloc_pte_late; 1017 pt_ops.get_pte_virt = get_pte_virt_late; 1018 #ifndef __PAGETABLE_PMD_FOLDED 1019 pt_ops.alloc_pmd = alloc_pmd_late; 1020 pt_ops.get_pmd_virt = get_pmd_virt_late; 1021 pt_ops.alloc_pud = alloc_pud_late; 1022 pt_ops.get_pud_virt = get_pud_virt_late; 1023 pt_ops.alloc_p4d = alloc_p4d_late; 1024 pt_ops.get_p4d_virt = get_p4d_virt_late; 1025 #endif 1026 } 1027 1028 #ifdef CONFIG_RANDOMIZE_BASE 1029 extern bool __init __pi_set_nokaslr_from_cmdline(uintptr_t dtb_pa); 1030 extern u64 __init __pi_get_kaslr_seed(uintptr_t dtb_pa); 1031 extern u64 __init __pi_get_kaslr_seed_zkr(const uintptr_t dtb_pa); 1032 1033 static int __init print_nokaslr(char *p) 1034 { 1035 pr_info("Disabled KASLR"); 1036 return 0; 1037 } 1038 early_param("nokaslr", print_nokaslr); 1039 #endif 1040 1041 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1042 { 1043 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd; 1044 1045 #ifdef CONFIG_RANDOMIZE_BASE 1046 if (!__pi_set_nokaslr_from_cmdline(dtb_pa)) { 1047 u64 kaslr_seed = __pi_get_kaslr_seed_zkr(dtb_pa); 1048 u32 kernel_size = (uintptr_t)(&_end) - (uintptr_t)(&_start); 1049 u32 nr_pos; 1050 1051 if (kaslr_seed == 0) 1052 kaslr_seed = __pi_get_kaslr_seed(dtb_pa); 1053 /* 1054 * Compute the number of positions available: we are limited 1055 * by the early page table that only has one PUD and we must 1056 * be aligned on PMD_SIZE. 1057 */ 1058 nr_pos = (PUD_SIZE - kernel_size) / PMD_SIZE; 1059 1060 kernel_map.virt_offset = (kaslr_seed % nr_pos) * PMD_SIZE; 1061 } 1062 #endif 1063 1064 kernel_map.virt_addr = KERNEL_LINK_ADDR + kernel_map.virt_offset; 1065 1066 kernel_map.phys_addr = (uintptr_t)(&_start); 1067 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr; 1068 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr; 1069 1070 #if defined(CONFIG_64BIT) 1071 set_satp_mode(dtb_pa); 1072 set_mmap_rnd_bits_max(); 1073 #endif 1074 1075 /* 1076 * In 64-bit, we defer the setup of va_pa_offset to setup_bootmem, 1077 * where we have the system memory layout: this allows us to align 1078 * the physical and virtual mappings and then make use of PUD/P4D/PGD 1079 * for the linear mapping. This is only possible because the kernel 1080 * mapping lies outside the linear mapping. 1081 * In 32-bit however, as the kernel resides in the linear mapping, 1082 * setup_vm_final can not change the mapping established here, 1083 * otherwise the same kernel addresses would get mapped to different 1084 * physical addresses (if the start of dram is different from the 1085 * kernel physical address start). 1086 */ 1087 kernel_map.va_pa_offset = IS_ENABLED(CONFIG_64BIT) ? 1088 0UL : PAGE_OFFSET - kernel_map.phys_addr; 1089 1090 memory_limit = KERN_VIRT_SIZE; 1091 1092 /* Sanity check alignment and size */ 1093 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 1094 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0); 1095 1096 #ifdef CONFIG_64BIT 1097 /* 1098 * The last 4K bytes of the addressable memory can not be mapped because 1099 * of IS_ERR_VALUE macro. 1100 */ 1101 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K); 1102 #endif 1103 1104 #ifdef CONFIG_RELOCATABLE 1105 /* 1106 * Early page table uses only one PUD, which makes it possible 1107 * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset 1108 * makes the kernel cross over a PUD_SIZE boundary, raise a bug 1109 * since a part of the kernel would not get mapped. 1110 */ 1111 if (IS_ENABLED(CONFIG_64BIT)) 1112 BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size); 1113 relocate_kernel(); 1114 #endif 1115 1116 apply_early_boot_alternatives(); 1117 pt_ops_set_early(); 1118 1119 /* Setup early PGD for fixmap */ 1120 create_pgd_mapping(early_pg_dir, FIXADDR_START, 1121 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 1122 1123 #ifndef __PAGETABLE_PMD_FOLDED 1124 /* Setup fixmap P4D and PUD */ 1125 if (pgtable_l5_enabled) 1126 create_p4d_mapping(fixmap_p4d, FIXADDR_START, 1127 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE); 1128 /* Setup fixmap PUD and PMD */ 1129 if (pgtable_l4_enabled) 1130 create_pud_mapping(fixmap_pud, FIXADDR_START, 1131 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE); 1132 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 1133 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 1134 /* Setup trampoline PGD and PMD */ 1135 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1136 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE); 1137 if (pgtable_l5_enabled) 1138 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr, 1139 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE); 1140 if (pgtable_l4_enabled) 1141 create_pud_mapping(trampoline_pud, kernel_map.virt_addr, 1142 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE); 1143 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 1144 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC); 1145 #else 1146 /* Setup trampoline PGD */ 1147 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1148 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC); 1149 #endif 1150 1151 /* 1152 * Setup early PGD covering entire kernel which will allow 1153 * us to reach paging_init(). We map all memory banks later 1154 * in setup_vm_final() below. 1155 */ 1156 create_kernel_page_table(early_pg_dir, true); 1157 1158 /* Setup early mapping for FDT early scan */ 1159 create_fdt_early_page_table(__fix_to_virt(FIX_FDT), dtb_pa); 1160 1161 /* 1162 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 1163 * range can not span multiple pmds. 1164 */ 1165 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 1166 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 1167 1168 #ifndef __PAGETABLE_PMD_FOLDED 1169 /* 1170 * Early ioremap fixmap is already created as it lies within first 2MB 1171 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 1172 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 1173 * the user if not. 1174 */ 1175 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 1176 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 1177 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 1178 WARN_ON(1); 1179 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 1180 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 1181 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 1182 fix_to_virt(FIX_BTMAP_BEGIN)); 1183 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 1184 fix_to_virt(FIX_BTMAP_END)); 1185 1186 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 1187 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 1188 } 1189 #endif 1190 1191 pt_ops_set_fixmap(); 1192 } 1193 1194 static void __meminit create_linear_mapping_range(phys_addr_t start, phys_addr_t end, 1195 uintptr_t fixed_map_size, const pgprot_t *pgprot) 1196 { 1197 phys_addr_t pa; 1198 uintptr_t va, map_size; 1199 1200 for (pa = start; pa < end; pa += map_size) { 1201 va = (uintptr_t)__va(pa); 1202 map_size = fixed_map_size ? fixed_map_size : 1203 best_map_size(pa, va, end - pa); 1204 1205 create_pgd_mapping(swapper_pg_dir, va, pa, map_size, 1206 pgprot ? *pgprot : pgprot_from_va(va)); 1207 } 1208 } 1209 1210 static void __init create_linear_mapping_page_table(void) 1211 { 1212 phys_addr_t start, end; 1213 phys_addr_t kfence_pool __maybe_unused; 1214 u64 i; 1215 1216 #ifdef CONFIG_STRICT_KERNEL_RWX 1217 phys_addr_t ktext_start = __pa_symbol(_start); 1218 phys_addr_t ktext_size = __init_data_begin - _start; 1219 phys_addr_t krodata_start = __pa_symbol(__start_rodata); 1220 phys_addr_t krodata_size = _data - __start_rodata; 1221 1222 /* Isolate kernel text and rodata so they don't get mapped with a PUD */ 1223 memblock_mark_nomap(ktext_start, ktext_size); 1224 memblock_mark_nomap(krodata_start, krodata_size); 1225 #endif 1226 1227 #ifdef CONFIG_KFENCE 1228 /* 1229 * kfence pool must be backed by PAGE_SIZE mappings, so allocate it 1230 * before we setup the linear mapping so that we avoid using hugepages 1231 * for this region. 1232 */ 1233 kfence_pool = memblock_phys_alloc(KFENCE_POOL_SIZE, PAGE_SIZE); 1234 BUG_ON(!kfence_pool); 1235 1236 memblock_mark_nomap(kfence_pool, KFENCE_POOL_SIZE); 1237 __kfence_pool = __va(kfence_pool); 1238 #endif 1239 1240 /* Map all memory banks in the linear mapping */ 1241 for_each_mem_range(i, &start, &end) { 1242 if (start >= end) 1243 break; 1244 if (start <= __pa(PAGE_OFFSET) && 1245 __pa(PAGE_OFFSET) < end) 1246 start = __pa(PAGE_OFFSET); 1247 1248 create_linear_mapping_range(start, end, 0, NULL); 1249 } 1250 1251 #ifdef CONFIG_STRICT_KERNEL_RWX 1252 create_linear_mapping_range(ktext_start, ktext_start + ktext_size, 0, NULL); 1253 create_linear_mapping_range(krodata_start, krodata_start + krodata_size, 0, NULL); 1254 1255 memblock_clear_nomap(ktext_start, ktext_size); 1256 memblock_clear_nomap(krodata_start, krodata_size); 1257 #endif 1258 1259 #ifdef CONFIG_KFENCE 1260 create_linear_mapping_range(kfence_pool, kfence_pool + KFENCE_POOL_SIZE, PAGE_SIZE, NULL); 1261 1262 memblock_clear_nomap(kfence_pool, KFENCE_POOL_SIZE); 1263 #endif 1264 } 1265 1266 static void __init setup_vm_final(void) 1267 { 1268 /* Setup swapper PGD for fixmap */ 1269 #if !defined(CONFIG_64BIT) 1270 /* 1271 * In 32-bit, the device tree lies in a pgd entry, so it must be copied 1272 * directly in swapper_pg_dir in addition to the pgd entry that points 1273 * to fixmap_pte. 1274 */ 1275 unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT)); 1276 1277 set_pgd(&swapper_pg_dir[idx], early_pg_dir[idx]); 1278 #endif 1279 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 1280 __pa_symbol(fixmap_pgd_next), 1281 PGDIR_SIZE, PAGE_TABLE); 1282 1283 /* Map the linear mapping */ 1284 create_linear_mapping_page_table(); 1285 1286 /* Map the kernel */ 1287 if (IS_ENABLED(CONFIG_64BIT)) 1288 create_kernel_page_table(swapper_pg_dir, false); 1289 1290 #ifdef CONFIG_KASAN 1291 kasan_swapper_init(); 1292 #endif 1293 1294 /* Clear fixmap PTE and PMD mappings */ 1295 clear_fixmap(FIX_PTE); 1296 clear_fixmap(FIX_PMD); 1297 clear_fixmap(FIX_PUD); 1298 clear_fixmap(FIX_P4D); 1299 1300 /* Move to swapper page table */ 1301 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode); 1302 local_flush_tlb_all(); 1303 1304 pt_ops_set_late(); 1305 } 1306 #else 1307 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1308 { 1309 dtb_early_va = (void *)dtb_pa; 1310 dtb_early_pa = dtb_pa; 1311 1312 #ifdef CONFIG_RELOCATABLE 1313 kernel_map.virt_addr = (uintptr_t)_start; 1314 kernel_map.phys_addr = (uintptr_t)_start; 1315 relocate_kernel(); 1316 #endif 1317 } 1318 1319 static inline void setup_vm_final(void) 1320 { 1321 } 1322 #endif /* CONFIG_MMU */ 1323 1324 /* 1325 * reserve_crashkernel() - reserves memory for crash kernel 1326 * 1327 * This function reserves memory area given in "crashkernel=" kernel command 1328 * line parameter. The memory reserved is used by dump capture kernel when 1329 * primary kernel is crashing. 1330 */ 1331 static void __init arch_reserve_crashkernel(void) 1332 { 1333 unsigned long long low_size = 0; 1334 unsigned long long crash_base, crash_size; 1335 bool high = false; 1336 int ret; 1337 1338 if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) 1339 return; 1340 1341 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), 1342 &crash_size, &crash_base, 1343 &low_size, NULL, &high); 1344 if (ret) 1345 return; 1346 1347 reserve_crashkernel_generic(crash_size, crash_base, low_size, high); 1348 } 1349 1350 void __init paging_init(void) 1351 { 1352 setup_bootmem(); 1353 setup_vm_final(); 1354 1355 /* Depend on that Linear Mapping is ready */ 1356 memblock_allow_resize(); 1357 } 1358 1359 void __init misc_mem_init(void) 1360 { 1361 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 1362 arch_numa_init(); 1363 #ifdef CONFIG_SPARSEMEM_VMEMMAP 1364 /* The entire VMEMMAP region has been populated. Flush TLB for this region */ 1365 local_flush_tlb_kernel_range(VMEMMAP_START, VMEMMAP_END); 1366 #endif 1367 arch_reserve_crashkernel(); 1368 memblock_dump_all(); 1369 } 1370 1371 #ifdef CONFIG_SPARSEMEM_VMEMMAP 1372 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 1373 struct vmem_altmap *altmap) 1374 { 1375 WARN_ON((start < VMEMMAP_START) || (end > VMEMMAP_END)); 1376 1377 /* 1378 * Note that SPARSEMEM_VMEMMAP is only selected for rv64 and that we 1379 * can't use hugepage mappings for 2-level page table because in case of 1380 * memory hotplug, we are not able to update all the page tables with 1381 * the new PMDs. 1382 */ 1383 return vmemmap_populate_hugepages(start, end, node, altmap); 1384 } 1385 #endif 1386 1387 #if defined(CONFIG_MMU) && defined(CONFIG_64BIT) 1388 /* 1389 * Pre-allocates page-table pages for a specific area in the kernel 1390 * page-table. Only the level which needs to be synchronized between 1391 * all page-tables is allocated because the synchronization can be 1392 * expensive. 1393 */ 1394 static void __init preallocate_pgd_pages_range(unsigned long start, unsigned long end, 1395 const char *area) 1396 { 1397 unsigned long addr; 1398 const char *lvl; 1399 1400 for (addr = start; addr < end && addr >= start; addr = ALIGN(addr + 1, PGDIR_SIZE)) { 1401 pgd_t *pgd = pgd_offset_k(addr); 1402 p4d_t *p4d; 1403 pud_t *pud; 1404 pmd_t *pmd; 1405 1406 lvl = "p4d"; 1407 p4d = p4d_alloc(&init_mm, pgd, addr); 1408 if (!p4d) 1409 goto failed; 1410 1411 if (pgtable_l5_enabled) 1412 continue; 1413 1414 lvl = "pud"; 1415 pud = pud_alloc(&init_mm, p4d, addr); 1416 if (!pud) 1417 goto failed; 1418 1419 if (pgtable_l4_enabled) 1420 continue; 1421 1422 lvl = "pmd"; 1423 pmd = pmd_alloc(&init_mm, pud, addr); 1424 if (!pmd) 1425 goto failed; 1426 } 1427 return; 1428 1429 failed: 1430 /* 1431 * The pages have to be there now or they will be missing in 1432 * process page-tables later. 1433 */ 1434 panic("Failed to pre-allocate %s pages for %s area\n", lvl, area); 1435 } 1436 1437 #define PAGE_END KASAN_SHADOW_START 1438 1439 void __init pgtable_cache_init(void) 1440 { 1441 preallocate_pgd_pages_range(VMALLOC_START, VMALLOC_END, "vmalloc"); 1442 if (IS_ENABLED(CONFIG_MODULES)) 1443 preallocate_pgd_pages_range(MODULES_VADDR, MODULES_END, "bpf/modules"); 1444 if (IS_ENABLED(CONFIG_MEMORY_HOTPLUG)) { 1445 preallocate_pgd_pages_range(VMEMMAP_START, VMEMMAP_END, "vmemmap"); 1446 preallocate_pgd_pages_range(PAGE_OFFSET, PAGE_END, "direct map"); 1447 if (IS_ENABLED(CONFIG_KASAN)) 1448 preallocate_pgd_pages_range(KASAN_SHADOW_START, KASAN_SHADOW_END, "kasan"); 1449 } 1450 } 1451 #endif 1452 1453 #ifdef CONFIG_EXECMEM 1454 #ifdef CONFIG_MMU 1455 static struct execmem_info execmem_info __ro_after_init; 1456 1457 struct execmem_info __init *execmem_arch_setup(void) 1458 { 1459 execmem_info = (struct execmem_info){ 1460 .ranges = { 1461 [EXECMEM_DEFAULT] = { 1462 .start = MODULES_VADDR, 1463 .end = MODULES_END, 1464 .pgprot = PAGE_KERNEL, 1465 .alignment = 1, 1466 }, 1467 [EXECMEM_KPROBES] = { 1468 .start = VMALLOC_START, 1469 .end = VMALLOC_END, 1470 .pgprot = PAGE_KERNEL_READ_EXEC, 1471 .alignment = 1, 1472 }, 1473 [EXECMEM_BPF] = { 1474 .start = BPF_JIT_REGION_START, 1475 .end = BPF_JIT_REGION_END, 1476 .pgprot = PAGE_KERNEL, 1477 .alignment = PAGE_SIZE, 1478 }, 1479 }, 1480 }; 1481 1482 return &execmem_info; 1483 } 1484 #endif /* CONFIG_MMU */ 1485 #endif /* CONFIG_EXECMEM */ 1486 1487 #ifdef CONFIG_MEMORY_HOTPLUG 1488 static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd) 1489 { 1490 struct page *page = pmd_page(*pmd); 1491 struct ptdesc *ptdesc = page_ptdesc(page); 1492 pte_t *pte; 1493 int i; 1494 1495 for (i = 0; i < PTRS_PER_PTE; i++) { 1496 pte = pte_start + i; 1497 if (!pte_none(*pte)) 1498 return; 1499 } 1500 1501 pagetable_dtor(ptdesc); 1502 if (PageReserved(page)) 1503 free_reserved_page(page); 1504 else 1505 pagetable_free(ptdesc); 1506 pmd_clear(pmd); 1507 } 1508 1509 static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud, bool is_vmemmap) 1510 { 1511 struct page *page = pud_page(*pud); 1512 struct ptdesc *ptdesc = page_ptdesc(page); 1513 pmd_t *pmd; 1514 int i; 1515 1516 for (i = 0; i < PTRS_PER_PMD; i++) { 1517 pmd = pmd_start + i; 1518 if (!pmd_none(*pmd)) 1519 return; 1520 } 1521 1522 if (!is_vmemmap) 1523 pagetable_dtor(ptdesc); 1524 if (PageReserved(page)) 1525 free_reserved_page(page); 1526 else 1527 pagetable_free(ptdesc); 1528 pud_clear(pud); 1529 } 1530 1531 static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d) 1532 { 1533 struct page *page = p4d_page(*p4d); 1534 pud_t *pud; 1535 int i; 1536 1537 for (i = 0; i < PTRS_PER_PUD; i++) { 1538 pud = pud_start + i; 1539 if (!pud_none(*pud)) 1540 return; 1541 } 1542 1543 if (PageReserved(page)) 1544 free_reserved_page(page); 1545 else 1546 __free_pages(page, 0); 1547 p4d_clear(p4d); 1548 } 1549 1550 static void __meminit free_vmemmap_storage(struct page *page, size_t size, 1551 struct vmem_altmap *altmap) 1552 { 1553 int order = get_order(size); 1554 1555 if (altmap) { 1556 vmem_altmap_free(altmap, size >> PAGE_SHIFT); 1557 return; 1558 } 1559 1560 if (PageReserved(page)) { 1561 unsigned int nr_pages = 1 << order; 1562 1563 while (nr_pages--) 1564 free_reserved_page(page++); 1565 return; 1566 } 1567 1568 __free_pages(page, order); 1569 } 1570 1571 static void __meminit remove_pte_mapping(pte_t *pte_base, unsigned long addr, unsigned long end, 1572 bool is_vmemmap, struct vmem_altmap *altmap) 1573 { 1574 unsigned long next; 1575 pte_t *ptep, pte; 1576 1577 for (; addr < end; addr = next) { 1578 next = (addr + PAGE_SIZE) & PAGE_MASK; 1579 if (next > end) 1580 next = end; 1581 1582 ptep = pte_base + pte_index(addr); 1583 pte = ptep_get(ptep); 1584 if (!pte_present(*ptep)) 1585 continue; 1586 1587 pte_clear(&init_mm, addr, ptep); 1588 if (is_vmemmap) 1589 free_vmemmap_storage(pte_page(pte), PAGE_SIZE, altmap); 1590 } 1591 } 1592 1593 static void __meminit remove_pmd_mapping(pmd_t *pmd_base, unsigned long addr, unsigned long end, 1594 bool is_vmemmap, struct vmem_altmap *altmap) 1595 { 1596 unsigned long next; 1597 pte_t *pte_base; 1598 pmd_t *pmdp, pmd; 1599 1600 for (; addr < end; addr = next) { 1601 next = pmd_addr_end(addr, end); 1602 pmdp = pmd_base + pmd_index(addr); 1603 pmd = pmdp_get(pmdp); 1604 if (!pmd_present(pmd)) 1605 continue; 1606 1607 if (pmd_leaf(pmd)) { 1608 pmd_clear(pmdp); 1609 if (is_vmemmap) 1610 free_vmemmap_storage(pmd_page(pmd), PMD_SIZE, altmap); 1611 continue; 1612 } 1613 1614 pte_base = (pte_t *)pmd_page_vaddr(*pmdp); 1615 remove_pte_mapping(pte_base, addr, next, is_vmemmap, altmap); 1616 free_pte_table(pte_base, pmdp); 1617 } 1618 } 1619 1620 static void __meminit remove_pud_mapping(pud_t *pud_base, unsigned long addr, unsigned long end, 1621 bool is_vmemmap, struct vmem_altmap *altmap) 1622 { 1623 unsigned long next; 1624 pud_t *pudp, pud; 1625 pmd_t *pmd_base; 1626 1627 for (; addr < end; addr = next) { 1628 next = pud_addr_end(addr, end); 1629 pudp = pgtable_l4_enabled ? pud_base + pud_index(addr) : pud_base; 1630 pud = pudp_get(pudp); 1631 if (!pud_present(pud)) 1632 continue; 1633 1634 if (pud_leaf(pud)) { 1635 if (pgtable_l4_enabled) { 1636 pud_clear(pudp); 1637 if (is_vmemmap) 1638 free_vmemmap_storage(pud_page(pud), PUD_SIZE, altmap); 1639 } 1640 continue; 1641 } 1642 1643 pmd_base = pmd_offset(pudp, 0); 1644 remove_pmd_mapping(pmd_base, addr, next, is_vmemmap, altmap); 1645 1646 if (pgtable_l4_enabled) 1647 free_pmd_table(pmd_base, pudp, is_vmemmap); 1648 } 1649 } 1650 1651 static void __meminit remove_p4d_mapping(p4d_t *p4d_base, unsigned long addr, unsigned long end, 1652 bool is_vmemmap, struct vmem_altmap *altmap) 1653 { 1654 unsigned long next; 1655 p4d_t *p4dp, p4d; 1656 pud_t *pud_base; 1657 1658 for (; addr < end; addr = next) { 1659 next = p4d_addr_end(addr, end); 1660 p4dp = pgtable_l5_enabled ? p4d_base + p4d_index(addr) : p4d_base; 1661 p4d = p4dp_get(p4dp); 1662 if (!p4d_present(p4d)) 1663 continue; 1664 1665 if (p4d_leaf(p4d)) { 1666 if (pgtable_l5_enabled) { 1667 p4d_clear(p4dp); 1668 if (is_vmemmap) 1669 free_vmemmap_storage(p4d_page(p4d), P4D_SIZE, altmap); 1670 } 1671 continue; 1672 } 1673 1674 pud_base = pud_offset(p4dp, 0); 1675 remove_pud_mapping(pud_base, addr, next, is_vmemmap, altmap); 1676 1677 if (pgtable_l5_enabled) 1678 free_pud_table(pud_base, p4dp); 1679 } 1680 } 1681 1682 static void __meminit remove_pgd_mapping(unsigned long va, unsigned long end, bool is_vmemmap, 1683 struct vmem_altmap *altmap) 1684 { 1685 unsigned long addr, next; 1686 p4d_t *p4d_base; 1687 pgd_t *pgd; 1688 1689 for (addr = va; addr < end; addr = next) { 1690 next = pgd_addr_end(addr, end); 1691 pgd = pgd_offset_k(addr); 1692 1693 if (!pgd_present(*pgd)) 1694 continue; 1695 1696 if (pgd_leaf(*pgd)) 1697 continue; 1698 1699 p4d_base = p4d_offset(pgd, 0); 1700 remove_p4d_mapping(p4d_base, addr, next, is_vmemmap, altmap); 1701 } 1702 1703 flush_tlb_all(); 1704 } 1705 1706 static void __meminit remove_linear_mapping(phys_addr_t start, u64 size) 1707 { 1708 unsigned long va = (unsigned long)__va(start); 1709 unsigned long end = (unsigned long)__va(start + size); 1710 1711 remove_pgd_mapping(va, end, false, NULL); 1712 } 1713 1714 struct range arch_get_mappable_range(void) 1715 { 1716 struct range mhp_range; 1717 1718 mhp_range.start = __pa(PAGE_OFFSET); 1719 mhp_range.end = __pa(PAGE_END - 1); 1720 return mhp_range; 1721 } 1722 1723 int __ref arch_add_memory(int nid, u64 start, u64 size, struct mhp_params *params) 1724 { 1725 int ret = 0; 1726 1727 create_linear_mapping_range(start, start + size, 0, ¶ms->pgprot); 1728 ret = __add_pages(nid, start >> PAGE_SHIFT, size >> PAGE_SHIFT, params); 1729 if (ret) { 1730 remove_linear_mapping(start, size); 1731 goto out; 1732 } 1733 1734 max_pfn = PFN_UP(start + size); 1735 max_low_pfn = max_pfn; 1736 1737 out: 1738 flush_tlb_all(); 1739 return ret; 1740 } 1741 1742 void __ref arch_remove_memory(u64 start, u64 size, struct vmem_altmap *altmap, 1743 struct dev_pagemap *pgmap) 1744 { 1745 __remove_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT, altmap, pgmap); 1746 remove_linear_mapping(start, size); 1747 flush_tlb_all(); 1748 } 1749 1750 void __ref vmemmap_free(unsigned long start, unsigned long end, struct vmem_altmap *altmap) 1751 { 1752 remove_pgd_mapping(start, end, true, altmap); 1753 } 1754 #endif /* CONFIG_MEMORY_HOTPLUG */ 1755