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 24 #include <asm/fixmap.h> 25 #include <asm/tlbflush.h> 26 #include <asm/sections.h> 27 #include <asm/soc.h> 28 #include <asm/io.h> 29 #include <asm/ptdump.h> 30 #include <asm/numa.h> 31 32 #include "../kernel/head.h" 33 34 struct kernel_mapping kernel_map __ro_after_init; 35 EXPORT_SYMBOL(kernel_map); 36 #ifdef CONFIG_XIP_KERNEL 37 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map)) 38 #endif 39 40 #ifdef CONFIG_64BIT 41 u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39; 42 #else 43 u64 satp_mode __ro_after_init = SATP_MODE_32; 44 #endif 45 EXPORT_SYMBOL(satp_mode); 46 47 bool pgtable_l4_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL); 48 bool pgtable_l5_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL); 49 EXPORT_SYMBOL(pgtable_l4_enabled); 50 EXPORT_SYMBOL(pgtable_l5_enabled); 51 52 phys_addr_t phys_ram_base __ro_after_init; 53 EXPORT_SYMBOL(phys_ram_base); 54 55 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 56 __page_aligned_bss; 57 EXPORT_SYMBOL(empty_zero_page); 58 59 extern char _start[]; 60 #define DTB_EARLY_BASE_VA PGDIR_SIZE 61 void *_dtb_early_va __initdata; 62 uintptr_t _dtb_early_pa __initdata; 63 64 static phys_addr_t dma32_phys_limit __initdata; 65 66 static void __init zone_sizes_init(void) 67 { 68 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 69 70 #ifdef CONFIG_ZONE_DMA32 71 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); 72 #endif 73 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 74 75 free_area_init(max_zone_pfns); 76 } 77 78 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 79 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 80 { 81 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 82 (((t) - (b)) >> 10)); 83 } 84 85 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 86 { 87 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 88 (((t) - (b)) >> 20)); 89 } 90 91 static void __init print_vm_layout(void) 92 { 93 pr_notice("Virtual kernel memory layout:\n"); 94 print_mlk("fixmap", (unsigned long)FIXADDR_START, 95 (unsigned long)FIXADDR_TOP); 96 print_mlm("pci io", (unsigned long)PCI_IO_START, 97 (unsigned long)PCI_IO_END); 98 print_mlm("vmemmap", (unsigned long)VMEMMAP_START, 99 (unsigned long)VMEMMAP_END); 100 print_mlm("vmalloc", (unsigned long)VMALLOC_START, 101 (unsigned long)VMALLOC_END); 102 print_mlm("lowmem", (unsigned long)PAGE_OFFSET, 103 (unsigned long)high_memory); 104 if (IS_ENABLED(CONFIG_64BIT)) { 105 #ifdef CONFIG_KASAN 106 print_mlm("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END); 107 #endif 108 109 print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR, 110 (unsigned long)ADDRESS_SPACE_END); 111 } 112 } 113 #else 114 static void print_vm_layout(void) { } 115 #endif /* CONFIG_DEBUG_VM */ 116 117 void __init mem_init(void) 118 { 119 #ifdef CONFIG_FLATMEM 120 BUG_ON(!mem_map); 121 #endif /* CONFIG_FLATMEM */ 122 123 #ifdef CONFIG_SWIOTLB 124 if (swiotlb_force == SWIOTLB_FORCE || 125 max_pfn > PFN_DOWN(dma32_phys_limit)) 126 swiotlb_init(1); 127 else 128 swiotlb_force = SWIOTLB_NO_FORCE; 129 #endif 130 memblock_free_all(); 131 132 print_vm_layout(); 133 } 134 135 /* Limit the memory size via mem. */ 136 static phys_addr_t memory_limit; 137 138 static int __init early_mem(char *p) 139 { 140 u64 size; 141 142 if (!p) 143 return 1; 144 145 size = memparse(p, &p) & PAGE_MASK; 146 memory_limit = min_t(u64, size, memory_limit); 147 148 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20); 149 150 return 0; 151 } 152 early_param("mem", early_mem); 153 154 static void __init setup_bootmem(void) 155 { 156 phys_addr_t vmlinux_end = __pa_symbol(&_end); 157 phys_addr_t max_mapped_addr; 158 phys_addr_t phys_ram_end, vmlinux_start; 159 160 if (IS_ENABLED(CONFIG_XIP_KERNEL)) 161 vmlinux_start = __pa_symbol(&_sdata); 162 else 163 vmlinux_start = __pa_symbol(&_start); 164 165 memblock_enforce_memory_limit(memory_limit); 166 167 /* 168 * Make sure we align the reservation on PMD_SIZE since we will 169 * map the kernel in the linear mapping as read-only: we do not want 170 * any allocation to happen between _end and the next pmd aligned page. 171 */ 172 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) 173 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK; 174 /* 175 * Reserve from the start of the kernel to the end of the kernel 176 */ 177 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 178 179 phys_ram_end = memblock_end_of_DRAM(); 180 if (!IS_ENABLED(CONFIG_XIP_KERNEL)) 181 phys_ram_base = memblock_start_of_DRAM(); 182 /* 183 * memblock allocator is not aware of the fact that last 4K bytes of 184 * the addressable memory can not be mapped because of IS_ERR_VALUE 185 * macro. Make sure that last 4k bytes are not usable by memblock 186 * if end of dram is equal to maximum addressable memory. For 64-bit 187 * kernel, this problem can't happen here as the end of the virtual 188 * address space is occupied by the kernel mapping then this check must 189 * be done as soon as the kernel mapping base address is determined. 190 */ 191 if (!IS_ENABLED(CONFIG_64BIT)) { 192 max_mapped_addr = __pa(~(ulong)0); 193 if (max_mapped_addr == (phys_ram_end - 1)) 194 memblock_set_current_limit(max_mapped_addr - 4096); 195 } 196 197 min_low_pfn = PFN_UP(phys_ram_base); 198 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end); 199 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 200 201 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 202 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); 203 204 reserve_initrd_mem(); 205 /* 206 * If DTB is built in, no need to reserve its memblock. 207 * Otherwise, do reserve it but avoid using 208 * early_init_fdt_reserve_self() since __pa() does 209 * not work for DTB pointers that are fixmap addresses 210 */ 211 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) { 212 /* 213 * In case the DTB is not located in a memory region we won't 214 * be able to locate it later on via the linear mapping and 215 * get a segfault when accessing it via __va(dtb_early_pa). 216 * To avoid this situation copy DTB to a memory region. 217 * Note that memblock_phys_alloc will also reserve DTB region. 218 */ 219 if (!memblock_is_memory(dtb_early_pa)) { 220 size_t fdt_size = fdt_totalsize(dtb_early_va); 221 phys_addr_t new_dtb_early_pa = memblock_phys_alloc(fdt_size, PAGE_SIZE); 222 void *new_dtb_early_va = early_memremap(new_dtb_early_pa, fdt_size); 223 224 memcpy(new_dtb_early_va, dtb_early_va, fdt_size); 225 early_memunmap(new_dtb_early_va, fdt_size); 226 _dtb_early_pa = new_dtb_early_pa; 227 } else 228 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 229 } 230 231 early_init_fdt_scan_reserved_mem(); 232 dma_contiguous_reserve(dma32_phys_limit); 233 if (IS_ENABLED(CONFIG_64BIT)) 234 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 235 memblock_allow_resize(); 236 } 237 238 #ifdef CONFIG_MMU 239 struct pt_alloc_ops pt_ops __initdata; 240 241 unsigned long riscv_pfn_base __ro_after_init; 242 EXPORT_SYMBOL(riscv_pfn_base); 243 244 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 245 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 246 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 247 248 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 249 static p4d_t __maybe_unused early_dtb_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 250 static pud_t __maybe_unused early_dtb_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); 251 static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 252 253 #ifdef CONFIG_XIP_KERNEL 254 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops)) 255 #define riscv_pfn_base (*(unsigned long *)XIP_FIXUP(&riscv_pfn_base)) 256 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir)) 257 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte)) 258 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir)) 259 #endif /* CONFIG_XIP_KERNEL */ 260 261 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 262 { 263 unsigned long addr = __fix_to_virt(idx); 264 pte_t *ptep; 265 266 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 267 268 ptep = &fixmap_pte[pte_index(addr)]; 269 270 if (pgprot_val(prot)) 271 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 272 else 273 pte_clear(&init_mm, addr, ptep); 274 local_flush_tlb_page(addr); 275 } 276 277 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 278 { 279 return (pte_t *)((uintptr_t)pa); 280 } 281 282 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 283 { 284 clear_fixmap(FIX_PTE); 285 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 286 } 287 288 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa) 289 { 290 return (pte_t *) __va(pa); 291 } 292 293 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 294 { 295 /* 296 * We only create PMD or PGD early mappings so we 297 * should never reach here with MMU disabled. 298 */ 299 BUG(); 300 } 301 302 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 303 { 304 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 305 } 306 307 static phys_addr_t __init alloc_pte_late(uintptr_t va) 308 { 309 unsigned long vaddr; 310 311 vaddr = __get_free_page(GFP_KERNEL); 312 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr))); 313 314 return __pa(vaddr); 315 } 316 317 static void __init create_pte_mapping(pte_t *ptep, 318 uintptr_t va, phys_addr_t pa, 319 phys_addr_t sz, pgprot_t prot) 320 { 321 uintptr_t pte_idx = pte_index(va); 322 323 BUG_ON(sz != PAGE_SIZE); 324 325 if (pte_none(ptep[pte_idx])) 326 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 327 } 328 329 #ifndef __PAGETABLE_PMD_FOLDED 330 331 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 332 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 333 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 334 335 #ifdef CONFIG_XIP_KERNEL 336 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd)) 337 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd)) 338 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd)) 339 #endif /* CONFIG_XIP_KERNEL */ 340 341 static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss; 342 static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss; 343 static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 344 345 #ifdef CONFIG_XIP_KERNEL 346 #define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d)) 347 #define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d)) 348 #define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d)) 349 #endif /* CONFIG_XIP_KERNEL */ 350 351 static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss; 352 static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss; 353 static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); 354 355 #ifdef CONFIG_XIP_KERNEL 356 #define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud)) 357 #define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud)) 358 #define early_pud ((pud_t *)XIP_FIXUP(early_pud)) 359 #endif /* CONFIG_XIP_KERNEL */ 360 361 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 362 { 363 /* Before MMU is enabled */ 364 return (pmd_t *)((uintptr_t)pa); 365 } 366 367 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 368 { 369 clear_fixmap(FIX_PMD); 370 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 371 } 372 373 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa) 374 { 375 return (pmd_t *) __va(pa); 376 } 377 378 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 379 { 380 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT); 381 382 return (uintptr_t)early_pmd; 383 } 384 385 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 386 { 387 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 388 } 389 390 static phys_addr_t __init alloc_pmd_late(uintptr_t va) 391 { 392 unsigned long vaddr; 393 394 vaddr = __get_free_page(GFP_KERNEL); 395 BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr))); 396 397 return __pa(vaddr); 398 } 399 400 static void __init create_pmd_mapping(pmd_t *pmdp, 401 uintptr_t va, phys_addr_t pa, 402 phys_addr_t sz, pgprot_t prot) 403 { 404 pte_t *ptep; 405 phys_addr_t pte_phys; 406 uintptr_t pmd_idx = pmd_index(va); 407 408 if (sz == PMD_SIZE) { 409 if (pmd_none(pmdp[pmd_idx])) 410 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 411 return; 412 } 413 414 if (pmd_none(pmdp[pmd_idx])) { 415 pte_phys = pt_ops.alloc_pte(va); 416 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 417 ptep = pt_ops.get_pte_virt(pte_phys); 418 memset(ptep, 0, PAGE_SIZE); 419 } else { 420 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 421 ptep = pt_ops.get_pte_virt(pte_phys); 422 } 423 424 create_pte_mapping(ptep, va, pa, sz, prot); 425 } 426 427 static pud_t *__init get_pud_virt_early(phys_addr_t pa) 428 { 429 return (pud_t *)((uintptr_t)pa); 430 } 431 432 static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa) 433 { 434 clear_fixmap(FIX_PUD); 435 return (pud_t *)set_fixmap_offset(FIX_PUD, pa); 436 } 437 438 static pud_t *__init get_pud_virt_late(phys_addr_t pa) 439 { 440 return (pud_t *)__va(pa); 441 } 442 443 static phys_addr_t __init alloc_pud_early(uintptr_t va) 444 { 445 /* Only one PUD is available for early mapping */ 446 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 447 448 return (uintptr_t)early_pud; 449 } 450 451 static phys_addr_t __init alloc_pud_fixmap(uintptr_t va) 452 { 453 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 454 } 455 456 static phys_addr_t alloc_pud_late(uintptr_t va) 457 { 458 unsigned long vaddr; 459 460 vaddr = __get_free_page(GFP_KERNEL); 461 BUG_ON(!vaddr); 462 return __pa(vaddr); 463 } 464 465 static p4d_t *__init get_p4d_virt_early(phys_addr_t pa) 466 { 467 return (p4d_t *)((uintptr_t)pa); 468 } 469 470 static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa) 471 { 472 clear_fixmap(FIX_P4D); 473 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa); 474 } 475 476 static p4d_t *__init get_p4d_virt_late(phys_addr_t pa) 477 { 478 return (p4d_t *)__va(pa); 479 } 480 481 static phys_addr_t __init alloc_p4d_early(uintptr_t va) 482 { 483 /* Only one P4D is available for early mapping */ 484 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 485 486 return (uintptr_t)early_p4d; 487 } 488 489 static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va) 490 { 491 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 492 } 493 494 static phys_addr_t alloc_p4d_late(uintptr_t va) 495 { 496 unsigned long vaddr; 497 498 vaddr = __get_free_page(GFP_KERNEL); 499 BUG_ON(!vaddr); 500 return __pa(vaddr); 501 } 502 503 static void __init create_pud_mapping(pud_t *pudp, 504 uintptr_t va, phys_addr_t pa, 505 phys_addr_t sz, pgprot_t prot) 506 { 507 pmd_t *nextp; 508 phys_addr_t next_phys; 509 uintptr_t pud_index = pud_index(va); 510 511 if (sz == PUD_SIZE) { 512 if (pud_val(pudp[pud_index]) == 0) 513 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot); 514 return; 515 } 516 517 if (pud_val(pudp[pud_index]) == 0) { 518 next_phys = pt_ops.alloc_pmd(va); 519 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE); 520 nextp = pt_ops.get_pmd_virt(next_phys); 521 memset(nextp, 0, PAGE_SIZE); 522 } else { 523 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index])); 524 nextp = pt_ops.get_pmd_virt(next_phys); 525 } 526 527 create_pmd_mapping(nextp, va, pa, sz, prot); 528 } 529 530 static void __init create_p4d_mapping(p4d_t *p4dp, 531 uintptr_t va, phys_addr_t pa, 532 phys_addr_t sz, pgprot_t prot) 533 { 534 pud_t *nextp; 535 phys_addr_t next_phys; 536 uintptr_t p4d_index = p4d_index(va); 537 538 if (sz == P4D_SIZE) { 539 if (p4d_val(p4dp[p4d_index]) == 0) 540 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot); 541 return; 542 } 543 544 if (p4d_val(p4dp[p4d_index]) == 0) { 545 next_phys = pt_ops.alloc_pud(va); 546 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE); 547 nextp = pt_ops.get_pud_virt(next_phys); 548 memset(nextp, 0, PAGE_SIZE); 549 } else { 550 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index])); 551 nextp = pt_ops.get_pud_virt(next_phys); 552 } 553 554 create_pud_mapping(nextp, va, pa, sz, prot); 555 } 556 557 #define pgd_next_t p4d_t 558 #define alloc_pgd_next(__va) (pgtable_l5_enabled ? \ 559 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \ 560 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va))) 561 #define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \ 562 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \ 563 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa))) 564 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 565 (pgtable_l5_enabled ? \ 566 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \ 567 (pgtable_l4_enabled ? \ 568 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \ 569 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot))) 570 #define fixmap_pgd_next (pgtable_l5_enabled ? \ 571 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \ 572 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd)) 573 #define trampoline_pgd_next (pgtable_l5_enabled ? \ 574 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \ 575 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd)) 576 #define early_dtb_pgd_next (pgtable_l5_enabled ? \ 577 (uintptr_t)early_dtb_p4d : (pgtable_l4_enabled ? \ 578 (uintptr_t)early_dtb_pud : (uintptr_t)early_dtb_pmd)) 579 #else 580 #define pgd_next_t pte_t 581 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 582 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 583 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 584 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 585 #define fixmap_pgd_next ((uintptr_t)fixmap_pte) 586 #define early_dtb_pgd_next ((uintptr_t)early_dtb_pmd) 587 #define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) 588 #define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) 589 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) 590 #endif /* __PAGETABLE_PMD_FOLDED */ 591 592 void __init create_pgd_mapping(pgd_t *pgdp, 593 uintptr_t va, phys_addr_t pa, 594 phys_addr_t sz, pgprot_t prot) 595 { 596 pgd_next_t *nextp; 597 phys_addr_t next_phys; 598 uintptr_t pgd_idx = pgd_index(va); 599 600 if (sz == PGDIR_SIZE) { 601 if (pgd_val(pgdp[pgd_idx]) == 0) 602 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 603 return; 604 } 605 606 if (pgd_val(pgdp[pgd_idx]) == 0) { 607 next_phys = alloc_pgd_next(va); 608 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 609 nextp = get_pgd_next_virt(next_phys); 610 memset(nextp, 0, PAGE_SIZE); 611 } else { 612 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 613 nextp = get_pgd_next_virt(next_phys); 614 } 615 616 create_pgd_next_mapping(nextp, va, pa, sz, prot); 617 } 618 619 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 620 { 621 /* Upgrade to PMD_SIZE mappings whenever possible */ 622 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) 623 return PAGE_SIZE; 624 625 return PMD_SIZE; 626 } 627 628 #ifdef CONFIG_XIP_KERNEL 629 #define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base)) 630 extern char _xiprom[], _exiprom[], __data_loc; 631 632 /* called from head.S with MMU off */ 633 asmlinkage void __init __copy_data(void) 634 { 635 void *from = (void *)(&__data_loc); 636 void *to = (void *)CONFIG_PHYS_RAM_BASE; 637 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata)); 638 639 memcpy(to, from, sz); 640 } 641 #endif 642 643 #ifdef CONFIG_STRICT_KERNEL_RWX 644 static __init pgprot_t pgprot_from_va(uintptr_t va) 645 { 646 if (is_va_kernel_text(va)) 647 return PAGE_KERNEL_READ_EXEC; 648 649 /* 650 * In 64-bit kernel, the kernel mapping is outside the linear mapping so 651 * we must protect its linear mapping alias from being executed and 652 * written. 653 * And rodata section is marked readonly in mark_rodata_ro. 654 */ 655 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va)) 656 return PAGE_KERNEL_READ; 657 658 return PAGE_KERNEL; 659 } 660 661 void mark_rodata_ro(void) 662 { 663 set_kernel_memory(__start_rodata, _data, set_memory_ro); 664 if (IS_ENABLED(CONFIG_64BIT)) 665 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data), 666 set_memory_ro); 667 668 debug_checkwx(); 669 } 670 #else 671 static __init pgprot_t pgprot_from_va(uintptr_t va) 672 { 673 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va)) 674 return PAGE_KERNEL; 675 676 return PAGE_KERNEL_EXEC; 677 } 678 #endif /* CONFIG_STRICT_KERNEL_RWX */ 679 680 #ifdef CONFIG_64BIT 681 static void __init disable_pgtable_l5(void) 682 { 683 pgtable_l5_enabled = false; 684 kernel_map.page_offset = PAGE_OFFSET_L4; 685 satp_mode = SATP_MODE_48; 686 } 687 688 static void __init disable_pgtable_l4(void) 689 { 690 pgtable_l4_enabled = false; 691 kernel_map.page_offset = PAGE_OFFSET_L3; 692 satp_mode = SATP_MODE_39; 693 } 694 695 /* 696 * There is a simple way to determine if 4-level is supported by the 697 * underlying hardware: establish 1:1 mapping in 4-level page table mode 698 * then read SATP to see if the configuration was taken into account 699 * meaning sv48 is supported. 700 */ 701 static __init void set_satp_mode(void) 702 { 703 u64 identity_satp, hw_satp; 704 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; 705 bool check_l4 = false; 706 707 create_p4d_mapping(early_p4d, 708 set_satp_mode_pmd, (uintptr_t)early_pud, 709 P4D_SIZE, PAGE_TABLE); 710 create_pud_mapping(early_pud, 711 set_satp_mode_pmd, (uintptr_t)early_pmd, 712 PUD_SIZE, PAGE_TABLE); 713 /* Handle the case where set_satp_mode straddles 2 PMDs */ 714 create_pmd_mapping(early_pmd, 715 set_satp_mode_pmd, set_satp_mode_pmd, 716 PMD_SIZE, PAGE_KERNEL_EXEC); 717 create_pmd_mapping(early_pmd, 718 set_satp_mode_pmd + PMD_SIZE, 719 set_satp_mode_pmd + PMD_SIZE, 720 PMD_SIZE, PAGE_KERNEL_EXEC); 721 retry: 722 create_pgd_mapping(early_pg_dir, 723 set_satp_mode_pmd, 724 check_l4 ? (uintptr_t)early_pud : (uintptr_t)early_p4d, 725 PGDIR_SIZE, PAGE_TABLE); 726 727 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode; 728 729 local_flush_tlb_all(); 730 csr_write(CSR_SATP, identity_satp); 731 hw_satp = csr_swap(CSR_SATP, 0ULL); 732 local_flush_tlb_all(); 733 734 if (hw_satp != identity_satp) { 735 if (!check_l4) { 736 disable_pgtable_l5(); 737 check_l4 = true; 738 memset(early_pg_dir, 0, PAGE_SIZE); 739 goto retry; 740 } 741 disable_pgtable_l4(); 742 } 743 744 memset(early_pg_dir, 0, PAGE_SIZE); 745 memset(early_p4d, 0, PAGE_SIZE); 746 memset(early_pud, 0, PAGE_SIZE); 747 memset(early_pmd, 0, PAGE_SIZE); 748 } 749 #endif 750 751 /* 752 * setup_vm() is called from head.S with MMU-off. 753 * 754 * Following requirements should be honoured for setup_vm() to work 755 * correctly: 756 * 1) It should use PC-relative addressing for accessing kernel symbols. 757 * To achieve this we always use GCC cmodel=medany. 758 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 759 * so disable compiler instrumentation when FTRACE is enabled. 760 * 761 * Currently, the above requirements are honoured by using custom CFLAGS 762 * for init.o in mm/Makefile. 763 */ 764 765 #ifndef __riscv_cmodel_medany 766 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 767 #endif 768 769 #ifdef CONFIG_XIP_KERNEL 770 static void __init create_kernel_page_table(pgd_t *pgdir, 771 __always_unused bool early) 772 { 773 uintptr_t va, end_va; 774 775 /* Map the flash resident part */ 776 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz; 777 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 778 create_pgd_mapping(pgdir, va, 779 kernel_map.xiprom + (va - kernel_map.virt_addr), 780 PMD_SIZE, PAGE_KERNEL_EXEC); 781 782 /* Map the data in RAM */ 783 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size; 784 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE) 785 create_pgd_mapping(pgdir, va, 786 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)), 787 PMD_SIZE, PAGE_KERNEL); 788 } 789 #else 790 static void __init create_kernel_page_table(pgd_t *pgdir, bool early) 791 { 792 uintptr_t va, end_va; 793 794 end_va = kernel_map.virt_addr + kernel_map.size; 795 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 796 create_pgd_mapping(pgdir, va, 797 kernel_map.phys_addr + (va - kernel_map.virt_addr), 798 PMD_SIZE, 799 early ? 800 PAGE_KERNEL_EXEC : pgprot_from_va(va)); 801 } 802 #endif 803 804 /* 805 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel, 806 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR 807 * entry. 808 */ 809 static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa) 810 { 811 #ifndef CONFIG_BUILTIN_DTB 812 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1); 813 814 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 815 IS_ENABLED(CONFIG_64BIT) ? early_dtb_pgd_next : pa, 816 PGDIR_SIZE, 817 IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL); 818 819 if (pgtable_l5_enabled) 820 create_p4d_mapping(early_dtb_p4d, DTB_EARLY_BASE_VA, 821 (uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE); 822 823 if (pgtable_l4_enabled) 824 create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA, 825 (uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE); 826 827 if (IS_ENABLED(CONFIG_64BIT)) { 828 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA, 829 pa, PMD_SIZE, PAGE_KERNEL); 830 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE, 831 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 832 } 833 834 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1)); 835 #else 836 /* 837 * For 64-bit kernel, __va can't be used since it would return a linear 838 * mapping address whereas dtb_early_va will be used before 839 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the 840 * kernel is mapped in the linear mapping, that makes no difference. 841 */ 842 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa)); 843 #endif 844 845 dtb_early_pa = dtb_pa; 846 } 847 848 /* 849 * MMU is not enabled, the page tables are allocated directly using 850 * early_pmd/pud/p4d and the address returned is the physical one. 851 */ 852 void __init pt_ops_set_early(void) 853 { 854 pt_ops.alloc_pte = alloc_pte_early; 855 pt_ops.get_pte_virt = get_pte_virt_early; 856 #ifndef __PAGETABLE_PMD_FOLDED 857 pt_ops.alloc_pmd = alloc_pmd_early; 858 pt_ops.get_pmd_virt = get_pmd_virt_early; 859 pt_ops.alloc_pud = alloc_pud_early; 860 pt_ops.get_pud_virt = get_pud_virt_early; 861 pt_ops.alloc_p4d = alloc_p4d_early; 862 pt_ops.get_p4d_virt = get_p4d_virt_early; 863 #endif 864 } 865 866 /* 867 * MMU is enabled but page table setup is not complete yet. 868 * fixmap page table alloc functions must be used as a means to temporarily 869 * map the allocated physical pages since the linear mapping does not exist yet. 870 * 871 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va, 872 * but it will be used as described above. 873 */ 874 void __init pt_ops_set_fixmap(void) 875 { 876 pt_ops.alloc_pte = kernel_mapping_pa_to_va((uintptr_t)alloc_pte_fixmap); 877 pt_ops.get_pte_virt = kernel_mapping_pa_to_va((uintptr_t)get_pte_virt_fixmap); 878 #ifndef __PAGETABLE_PMD_FOLDED 879 pt_ops.alloc_pmd = kernel_mapping_pa_to_va((uintptr_t)alloc_pmd_fixmap); 880 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va((uintptr_t)get_pmd_virt_fixmap); 881 pt_ops.alloc_pud = kernel_mapping_pa_to_va((uintptr_t)alloc_pud_fixmap); 882 pt_ops.get_pud_virt = kernel_mapping_pa_to_va((uintptr_t)get_pud_virt_fixmap); 883 pt_ops.alloc_p4d = kernel_mapping_pa_to_va((uintptr_t)alloc_p4d_fixmap); 884 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va((uintptr_t)get_p4d_virt_fixmap); 885 #endif 886 } 887 888 /* 889 * MMU is enabled and page table setup is complete, so from now, we can use 890 * generic page allocation functions to setup page table. 891 */ 892 void __init pt_ops_set_late(void) 893 { 894 pt_ops.alloc_pte = alloc_pte_late; 895 pt_ops.get_pte_virt = get_pte_virt_late; 896 #ifndef __PAGETABLE_PMD_FOLDED 897 pt_ops.alloc_pmd = alloc_pmd_late; 898 pt_ops.get_pmd_virt = get_pmd_virt_late; 899 pt_ops.alloc_pud = alloc_pud_late; 900 pt_ops.get_pud_virt = get_pud_virt_late; 901 pt_ops.alloc_p4d = alloc_p4d_late; 902 pt_ops.get_p4d_virt = get_p4d_virt_late; 903 #endif 904 } 905 906 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 907 { 908 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd; 909 910 kernel_map.virt_addr = KERNEL_LINK_ADDR; 911 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL); 912 913 #ifdef CONFIG_XIP_KERNEL 914 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR; 915 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom); 916 917 phys_ram_base = CONFIG_PHYS_RAM_BASE; 918 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE; 919 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata); 920 921 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom; 922 #else 923 kernel_map.phys_addr = (uintptr_t)(&_start); 924 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr; 925 #endif 926 927 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) 928 set_satp_mode(); 929 #endif 930 931 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr; 932 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr; 933 934 riscv_pfn_base = PFN_DOWN(kernel_map.phys_addr); 935 936 /* 937 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit 938 * kernel, whereas for 64-bit kernel, the end of the virtual address 939 * space is occupied by the modules/BPF/kernel mappings which reduces 940 * the available size of the linear mapping. 941 */ 942 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0); 943 944 /* Sanity check alignment and size */ 945 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 946 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0); 947 948 #ifdef CONFIG_64BIT 949 /* 950 * The last 4K bytes of the addressable memory can not be mapped because 951 * of IS_ERR_VALUE macro. 952 */ 953 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K); 954 #endif 955 956 pt_ops_set_early(); 957 958 /* Setup early PGD for fixmap */ 959 create_pgd_mapping(early_pg_dir, FIXADDR_START, 960 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 961 962 #ifndef __PAGETABLE_PMD_FOLDED 963 /* Setup fixmap P4D and PUD */ 964 if (pgtable_l5_enabled) 965 create_p4d_mapping(fixmap_p4d, FIXADDR_START, 966 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE); 967 /* Setup fixmap PUD and PMD */ 968 if (pgtable_l4_enabled) 969 create_pud_mapping(fixmap_pud, FIXADDR_START, 970 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE); 971 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 972 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 973 /* Setup trampoline PGD and PMD */ 974 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 975 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE); 976 if (pgtable_l5_enabled) 977 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr, 978 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE); 979 if (pgtable_l4_enabled) 980 create_pud_mapping(trampoline_pud, kernel_map.virt_addr, 981 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE); 982 #ifdef CONFIG_XIP_KERNEL 983 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 984 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC); 985 #else 986 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 987 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC); 988 #endif 989 #else 990 /* Setup trampoline PGD */ 991 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 992 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC); 993 #endif 994 995 /* 996 * Setup early PGD covering entire kernel which will allow 997 * us to reach paging_init(). We map all memory banks later 998 * in setup_vm_final() below. 999 */ 1000 create_kernel_page_table(early_pg_dir, true); 1001 1002 /* Setup early mapping for FDT early scan */ 1003 create_fdt_early_page_table(early_pg_dir, dtb_pa); 1004 1005 /* 1006 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 1007 * range can not span multiple pmds. 1008 */ 1009 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 1010 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 1011 1012 #ifndef __PAGETABLE_PMD_FOLDED 1013 /* 1014 * Early ioremap fixmap is already created as it lies within first 2MB 1015 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 1016 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 1017 * the user if not. 1018 */ 1019 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 1020 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 1021 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 1022 WARN_ON(1); 1023 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 1024 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 1025 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 1026 fix_to_virt(FIX_BTMAP_BEGIN)); 1027 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 1028 fix_to_virt(FIX_BTMAP_END)); 1029 1030 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 1031 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 1032 } 1033 #endif 1034 1035 pt_ops_set_fixmap(); 1036 } 1037 1038 static void __init setup_vm_final(void) 1039 { 1040 uintptr_t va, map_size; 1041 phys_addr_t pa, start, end; 1042 u64 i; 1043 1044 /* Setup swapper PGD for fixmap */ 1045 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 1046 __pa_symbol(fixmap_pgd_next), 1047 PGDIR_SIZE, PAGE_TABLE); 1048 1049 /* Map all memory banks in the linear mapping */ 1050 for_each_mem_range(i, &start, &end) { 1051 if (start >= end) 1052 break; 1053 if (start <= __pa(PAGE_OFFSET) && 1054 __pa(PAGE_OFFSET) < end) 1055 start = __pa(PAGE_OFFSET); 1056 if (end >= __pa(PAGE_OFFSET) + memory_limit) 1057 end = __pa(PAGE_OFFSET) + memory_limit; 1058 1059 map_size = best_map_size(start, end - start); 1060 for (pa = start; pa < end; pa += map_size) { 1061 va = (uintptr_t)__va(pa); 1062 1063 create_pgd_mapping(swapper_pg_dir, va, pa, map_size, 1064 pgprot_from_va(va)); 1065 } 1066 } 1067 1068 /* Map the kernel */ 1069 if (IS_ENABLED(CONFIG_64BIT)) 1070 create_kernel_page_table(swapper_pg_dir, false); 1071 1072 #ifdef CONFIG_KASAN 1073 kasan_swapper_init(); 1074 #endif 1075 1076 /* Clear fixmap PTE and PMD mappings */ 1077 clear_fixmap(FIX_PTE); 1078 clear_fixmap(FIX_PMD); 1079 clear_fixmap(FIX_PUD); 1080 clear_fixmap(FIX_P4D); 1081 1082 /* Move to swapper page table */ 1083 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode); 1084 local_flush_tlb_all(); 1085 1086 pt_ops_set_late(); 1087 } 1088 #else 1089 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1090 { 1091 dtb_early_va = (void *)dtb_pa; 1092 dtb_early_pa = dtb_pa; 1093 } 1094 1095 static inline void setup_vm_final(void) 1096 { 1097 } 1098 #endif /* CONFIG_MMU */ 1099 1100 /* 1101 * reserve_crashkernel() - reserves memory for crash kernel 1102 * 1103 * This function reserves memory area given in "crashkernel=" kernel command 1104 * line parameter. The memory reserved is used by dump capture kernel when 1105 * primary kernel is crashing. 1106 */ 1107 static void __init reserve_crashkernel(void) 1108 { 1109 unsigned long long crash_base = 0; 1110 unsigned long long crash_size = 0; 1111 unsigned long search_start = memblock_start_of_DRAM(); 1112 unsigned long search_end = memblock_end_of_DRAM(); 1113 1114 int ret = 0; 1115 1116 if (!IS_ENABLED(CONFIG_KEXEC_CORE)) 1117 return; 1118 /* 1119 * Don't reserve a region for a crash kernel on a crash kernel 1120 * since it doesn't make much sense and we have limited memory 1121 * resources. 1122 */ 1123 if (is_kdump_kernel()) { 1124 pr_info("crashkernel: ignoring reservation request\n"); 1125 return; 1126 } 1127 1128 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), 1129 &crash_size, &crash_base); 1130 if (ret || !crash_size) 1131 return; 1132 1133 crash_size = PAGE_ALIGN(crash_size); 1134 1135 if (crash_base) { 1136 search_start = crash_base; 1137 search_end = crash_base + crash_size; 1138 } 1139 1140 /* 1141 * Current riscv boot protocol requires 2MB alignment for 1142 * RV64 and 4MB alignment for RV32 (hugepage size) 1143 * 1144 * Try to alloc from 32bit addressible physical memory so that 1145 * swiotlb can work on the crash kernel. 1146 */ 1147 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, 1148 search_start, 1149 min(search_end, (unsigned long) SZ_4G)); 1150 if (crash_base == 0) { 1151 /* Try again without restricting region to 32bit addressible memory */ 1152 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, 1153 search_start, search_end); 1154 if (crash_base == 0) { 1155 pr_warn("crashkernel: couldn't allocate %lldKB\n", 1156 crash_size >> 10); 1157 return; 1158 } 1159 } 1160 1161 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n", 1162 crash_base, crash_base + crash_size, crash_size >> 20); 1163 1164 crashk_res.start = crash_base; 1165 crashk_res.end = crash_base + crash_size - 1; 1166 } 1167 1168 void __init paging_init(void) 1169 { 1170 setup_bootmem(); 1171 setup_vm_final(); 1172 } 1173 1174 void __init misc_mem_init(void) 1175 { 1176 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 1177 arch_numa_init(); 1178 sparse_init(); 1179 zone_sizes_init(); 1180 reserve_crashkernel(); 1181 memblock_dump_all(); 1182 } 1183 1184 #ifdef CONFIG_SPARSEMEM_VMEMMAP 1185 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 1186 struct vmem_altmap *altmap) 1187 { 1188 return vmemmap_populate_basepages(start, end, node, NULL); 1189 } 1190 #endif 1191