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 80 #define LOG2_SZ_1K ilog2(SZ_1K) 81 #define LOG2_SZ_1M ilog2(SZ_1M) 82 #define LOG2_SZ_1G ilog2(SZ_1G) 83 #define LOG2_SZ_1T ilog2(SZ_1T) 84 85 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 86 { 87 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 88 (((t) - (b)) >> LOG2_SZ_1K)); 89 } 90 91 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 92 { 93 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 94 (((t) - (b)) >> LOG2_SZ_1M)); 95 } 96 97 static inline void print_mlg(char *name, unsigned long b, unsigned long t) 98 { 99 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t, 100 (((t) - (b)) >> LOG2_SZ_1G)); 101 } 102 103 #ifdef CONFIG_64BIT 104 static inline void print_mlt(char *name, unsigned long b, unsigned long t) 105 { 106 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t, 107 (((t) - (b)) >> LOG2_SZ_1T)); 108 } 109 #else 110 #define print_mlt(n, b, t) do {} while (0) 111 #endif 112 113 static inline void print_ml(char *name, unsigned long b, unsigned long t) 114 { 115 unsigned long diff = t - b; 116 117 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10) 118 print_mlt(name, b, t); 119 else if ((diff >> LOG2_SZ_1G) >= 10) 120 print_mlg(name, b, t); 121 else if ((diff >> LOG2_SZ_1M) >= 10) 122 print_mlm(name, b, t); 123 else 124 print_mlk(name, b, t); 125 } 126 127 static void __init print_vm_layout(void) 128 { 129 pr_notice("Virtual kernel memory layout:\n"); 130 print_ml("fixmap", (unsigned long)FIXADDR_START, 131 (unsigned long)FIXADDR_TOP); 132 print_ml("pci io", (unsigned long)PCI_IO_START, 133 (unsigned long)PCI_IO_END); 134 print_ml("vmemmap", (unsigned long)VMEMMAP_START, 135 (unsigned long)VMEMMAP_END); 136 print_ml("vmalloc", (unsigned long)VMALLOC_START, 137 (unsigned long)VMALLOC_END); 138 print_ml("lowmem", (unsigned long)PAGE_OFFSET, 139 (unsigned long)high_memory); 140 if (IS_ENABLED(CONFIG_64BIT)) { 141 #ifdef CONFIG_KASAN 142 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END); 143 #endif 144 145 print_ml("kernel", (unsigned long)KERNEL_LINK_ADDR, 146 (unsigned long)ADDRESS_SPACE_END); 147 } 148 } 149 #else 150 static void print_vm_layout(void) { } 151 #endif /* CONFIG_DEBUG_VM */ 152 153 void __init mem_init(void) 154 { 155 #ifdef CONFIG_FLATMEM 156 BUG_ON(!mem_map); 157 #endif /* CONFIG_FLATMEM */ 158 159 swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE); 160 memblock_free_all(); 161 162 print_vm_layout(); 163 } 164 165 /* Limit the memory size via mem. */ 166 static phys_addr_t memory_limit; 167 168 static int __init early_mem(char *p) 169 { 170 u64 size; 171 172 if (!p) 173 return 1; 174 175 size = memparse(p, &p) & PAGE_MASK; 176 memory_limit = min_t(u64, size, memory_limit); 177 178 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20); 179 180 return 0; 181 } 182 early_param("mem", early_mem); 183 184 static void __init setup_bootmem(void) 185 { 186 phys_addr_t vmlinux_end = __pa_symbol(&_end); 187 phys_addr_t max_mapped_addr; 188 phys_addr_t phys_ram_end, vmlinux_start; 189 190 if (IS_ENABLED(CONFIG_XIP_KERNEL)) 191 vmlinux_start = __pa_symbol(&_sdata); 192 else 193 vmlinux_start = __pa_symbol(&_start); 194 195 memblock_enforce_memory_limit(memory_limit); 196 197 /* 198 * Make sure we align the reservation on PMD_SIZE since we will 199 * map the kernel in the linear mapping as read-only: we do not want 200 * any allocation to happen between _end and the next pmd aligned page. 201 */ 202 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) 203 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK; 204 /* 205 * Reserve from the start of the kernel to the end of the kernel 206 */ 207 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 208 209 phys_ram_end = memblock_end_of_DRAM(); 210 if (!IS_ENABLED(CONFIG_XIP_KERNEL)) 211 phys_ram_base = memblock_start_of_DRAM(); 212 /* 213 * memblock allocator is not aware of the fact that last 4K bytes of 214 * the addressable memory can not be mapped because of IS_ERR_VALUE 215 * macro. Make sure that last 4k bytes are not usable by memblock 216 * if end of dram is equal to maximum addressable memory. For 64-bit 217 * kernel, this problem can't happen here as the end of the virtual 218 * address space is occupied by the kernel mapping then this check must 219 * be done as soon as the kernel mapping base address is determined. 220 */ 221 if (!IS_ENABLED(CONFIG_64BIT)) { 222 max_mapped_addr = __pa(~(ulong)0); 223 if (max_mapped_addr == (phys_ram_end - 1)) 224 memblock_set_current_limit(max_mapped_addr - 4096); 225 } 226 227 min_low_pfn = PFN_UP(phys_ram_base); 228 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end); 229 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 230 231 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 232 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); 233 234 reserve_initrd_mem(); 235 /* 236 * If DTB is built in, no need to reserve its memblock. 237 * Otherwise, do reserve it but avoid using 238 * early_init_fdt_reserve_self() since __pa() does 239 * not work for DTB pointers that are fixmap addresses 240 */ 241 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) { 242 /* 243 * In case the DTB is not located in a memory region we won't 244 * be able to locate it later on via the linear mapping and 245 * get a segfault when accessing it via __va(dtb_early_pa). 246 * To avoid this situation copy DTB to a memory region. 247 * Note that memblock_phys_alloc will also reserve DTB region. 248 */ 249 if (!memblock_is_memory(dtb_early_pa)) { 250 size_t fdt_size = fdt_totalsize(dtb_early_va); 251 phys_addr_t new_dtb_early_pa = memblock_phys_alloc(fdt_size, PAGE_SIZE); 252 void *new_dtb_early_va = early_memremap(new_dtb_early_pa, fdt_size); 253 254 memcpy(new_dtb_early_va, dtb_early_va, fdt_size); 255 early_memunmap(new_dtb_early_va, fdt_size); 256 _dtb_early_pa = new_dtb_early_pa; 257 } else 258 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 259 } 260 261 early_init_fdt_scan_reserved_mem(); 262 dma_contiguous_reserve(dma32_phys_limit); 263 if (IS_ENABLED(CONFIG_64BIT)) 264 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 265 memblock_allow_resize(); 266 } 267 268 #ifdef CONFIG_MMU 269 struct pt_alloc_ops pt_ops __initdata; 270 271 unsigned long riscv_pfn_base __ro_after_init; 272 EXPORT_SYMBOL(riscv_pfn_base); 273 274 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 275 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 276 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 277 278 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 279 static p4d_t __maybe_unused early_dtb_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 280 static pud_t __maybe_unused early_dtb_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); 281 static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 282 283 #ifdef CONFIG_XIP_KERNEL 284 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops)) 285 #define riscv_pfn_base (*(unsigned long *)XIP_FIXUP(&riscv_pfn_base)) 286 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir)) 287 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte)) 288 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir)) 289 #endif /* CONFIG_XIP_KERNEL */ 290 291 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 292 { 293 unsigned long addr = __fix_to_virt(idx); 294 pte_t *ptep; 295 296 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 297 298 ptep = &fixmap_pte[pte_index(addr)]; 299 300 if (pgprot_val(prot)) 301 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 302 else 303 pte_clear(&init_mm, addr, ptep); 304 local_flush_tlb_page(addr); 305 } 306 307 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 308 { 309 return (pte_t *)((uintptr_t)pa); 310 } 311 312 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 313 { 314 clear_fixmap(FIX_PTE); 315 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 316 } 317 318 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa) 319 { 320 return (pte_t *) __va(pa); 321 } 322 323 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 324 { 325 /* 326 * We only create PMD or PGD early mappings so we 327 * should never reach here with MMU disabled. 328 */ 329 BUG(); 330 } 331 332 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 333 { 334 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 335 } 336 337 static phys_addr_t __init alloc_pte_late(uintptr_t va) 338 { 339 unsigned long vaddr; 340 341 vaddr = __get_free_page(GFP_KERNEL); 342 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr))); 343 344 return __pa(vaddr); 345 } 346 347 static void __init create_pte_mapping(pte_t *ptep, 348 uintptr_t va, phys_addr_t pa, 349 phys_addr_t sz, pgprot_t prot) 350 { 351 uintptr_t pte_idx = pte_index(va); 352 353 BUG_ON(sz != PAGE_SIZE); 354 355 if (pte_none(ptep[pte_idx])) 356 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 357 } 358 359 #ifndef __PAGETABLE_PMD_FOLDED 360 361 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 362 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 363 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 364 365 #ifdef CONFIG_XIP_KERNEL 366 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd)) 367 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd)) 368 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd)) 369 #endif /* CONFIG_XIP_KERNEL */ 370 371 static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss; 372 static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss; 373 static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 374 375 #ifdef CONFIG_XIP_KERNEL 376 #define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d)) 377 #define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d)) 378 #define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d)) 379 #endif /* CONFIG_XIP_KERNEL */ 380 381 static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss; 382 static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss; 383 static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); 384 385 #ifdef CONFIG_XIP_KERNEL 386 #define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud)) 387 #define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud)) 388 #define early_pud ((pud_t *)XIP_FIXUP(early_pud)) 389 #endif /* CONFIG_XIP_KERNEL */ 390 391 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 392 { 393 /* Before MMU is enabled */ 394 return (pmd_t *)((uintptr_t)pa); 395 } 396 397 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 398 { 399 clear_fixmap(FIX_PMD); 400 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 401 } 402 403 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa) 404 { 405 return (pmd_t *) __va(pa); 406 } 407 408 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 409 { 410 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT); 411 412 return (uintptr_t)early_pmd; 413 } 414 415 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 416 { 417 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 418 } 419 420 static phys_addr_t __init alloc_pmd_late(uintptr_t va) 421 { 422 unsigned long vaddr; 423 424 vaddr = __get_free_page(GFP_KERNEL); 425 BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr))); 426 427 return __pa(vaddr); 428 } 429 430 static void __init create_pmd_mapping(pmd_t *pmdp, 431 uintptr_t va, phys_addr_t pa, 432 phys_addr_t sz, pgprot_t prot) 433 { 434 pte_t *ptep; 435 phys_addr_t pte_phys; 436 uintptr_t pmd_idx = pmd_index(va); 437 438 if (sz == PMD_SIZE) { 439 if (pmd_none(pmdp[pmd_idx])) 440 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 441 return; 442 } 443 444 if (pmd_none(pmdp[pmd_idx])) { 445 pte_phys = pt_ops.alloc_pte(va); 446 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 447 ptep = pt_ops.get_pte_virt(pte_phys); 448 memset(ptep, 0, PAGE_SIZE); 449 } else { 450 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 451 ptep = pt_ops.get_pte_virt(pte_phys); 452 } 453 454 create_pte_mapping(ptep, va, pa, sz, prot); 455 } 456 457 static pud_t *__init get_pud_virt_early(phys_addr_t pa) 458 { 459 return (pud_t *)((uintptr_t)pa); 460 } 461 462 static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa) 463 { 464 clear_fixmap(FIX_PUD); 465 return (pud_t *)set_fixmap_offset(FIX_PUD, pa); 466 } 467 468 static pud_t *__init get_pud_virt_late(phys_addr_t pa) 469 { 470 return (pud_t *)__va(pa); 471 } 472 473 static phys_addr_t __init alloc_pud_early(uintptr_t va) 474 { 475 /* Only one PUD is available for early mapping */ 476 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 477 478 return (uintptr_t)early_pud; 479 } 480 481 static phys_addr_t __init alloc_pud_fixmap(uintptr_t va) 482 { 483 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 484 } 485 486 static phys_addr_t alloc_pud_late(uintptr_t va) 487 { 488 unsigned long vaddr; 489 490 vaddr = __get_free_page(GFP_KERNEL); 491 BUG_ON(!vaddr); 492 return __pa(vaddr); 493 } 494 495 static p4d_t *__init get_p4d_virt_early(phys_addr_t pa) 496 { 497 return (p4d_t *)((uintptr_t)pa); 498 } 499 500 static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa) 501 { 502 clear_fixmap(FIX_P4D); 503 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa); 504 } 505 506 static p4d_t *__init get_p4d_virt_late(phys_addr_t pa) 507 { 508 return (p4d_t *)__va(pa); 509 } 510 511 static phys_addr_t __init alloc_p4d_early(uintptr_t va) 512 { 513 /* Only one P4D is available for early mapping */ 514 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 515 516 return (uintptr_t)early_p4d; 517 } 518 519 static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va) 520 { 521 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 522 } 523 524 static phys_addr_t alloc_p4d_late(uintptr_t va) 525 { 526 unsigned long vaddr; 527 528 vaddr = __get_free_page(GFP_KERNEL); 529 BUG_ON(!vaddr); 530 return __pa(vaddr); 531 } 532 533 static void __init create_pud_mapping(pud_t *pudp, 534 uintptr_t va, phys_addr_t pa, 535 phys_addr_t sz, pgprot_t prot) 536 { 537 pmd_t *nextp; 538 phys_addr_t next_phys; 539 uintptr_t pud_index = pud_index(va); 540 541 if (sz == PUD_SIZE) { 542 if (pud_val(pudp[pud_index]) == 0) 543 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot); 544 return; 545 } 546 547 if (pud_val(pudp[pud_index]) == 0) { 548 next_phys = pt_ops.alloc_pmd(va); 549 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE); 550 nextp = pt_ops.get_pmd_virt(next_phys); 551 memset(nextp, 0, PAGE_SIZE); 552 } else { 553 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index])); 554 nextp = pt_ops.get_pmd_virt(next_phys); 555 } 556 557 create_pmd_mapping(nextp, va, pa, sz, prot); 558 } 559 560 static void __init create_p4d_mapping(p4d_t *p4dp, 561 uintptr_t va, phys_addr_t pa, 562 phys_addr_t sz, pgprot_t prot) 563 { 564 pud_t *nextp; 565 phys_addr_t next_phys; 566 uintptr_t p4d_index = p4d_index(va); 567 568 if (sz == P4D_SIZE) { 569 if (p4d_val(p4dp[p4d_index]) == 0) 570 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot); 571 return; 572 } 573 574 if (p4d_val(p4dp[p4d_index]) == 0) { 575 next_phys = pt_ops.alloc_pud(va); 576 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE); 577 nextp = pt_ops.get_pud_virt(next_phys); 578 memset(nextp, 0, PAGE_SIZE); 579 } else { 580 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index])); 581 nextp = pt_ops.get_pud_virt(next_phys); 582 } 583 584 create_pud_mapping(nextp, va, pa, sz, prot); 585 } 586 587 #define pgd_next_t p4d_t 588 #define alloc_pgd_next(__va) (pgtable_l5_enabled ? \ 589 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \ 590 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va))) 591 #define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \ 592 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \ 593 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa))) 594 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 595 (pgtable_l5_enabled ? \ 596 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \ 597 (pgtable_l4_enabled ? \ 598 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \ 599 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot))) 600 #define fixmap_pgd_next (pgtable_l5_enabled ? \ 601 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \ 602 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd)) 603 #define trampoline_pgd_next (pgtable_l5_enabled ? \ 604 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \ 605 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd)) 606 #define early_dtb_pgd_next (pgtable_l5_enabled ? \ 607 (uintptr_t)early_dtb_p4d : (pgtable_l4_enabled ? \ 608 (uintptr_t)early_dtb_pud : (uintptr_t)early_dtb_pmd)) 609 #else 610 #define pgd_next_t pte_t 611 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 612 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 613 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 614 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 615 #define fixmap_pgd_next ((uintptr_t)fixmap_pte) 616 #define early_dtb_pgd_next ((uintptr_t)early_dtb_pmd) 617 #define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 618 #define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 619 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 620 #endif /* __PAGETABLE_PMD_FOLDED */ 621 622 void __init create_pgd_mapping(pgd_t *pgdp, 623 uintptr_t va, phys_addr_t pa, 624 phys_addr_t sz, pgprot_t prot) 625 { 626 pgd_next_t *nextp; 627 phys_addr_t next_phys; 628 uintptr_t pgd_idx = pgd_index(va); 629 630 if (sz == PGDIR_SIZE) { 631 if (pgd_val(pgdp[pgd_idx]) == 0) 632 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 633 return; 634 } 635 636 if (pgd_val(pgdp[pgd_idx]) == 0) { 637 next_phys = alloc_pgd_next(va); 638 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 639 nextp = get_pgd_next_virt(next_phys); 640 memset(nextp, 0, PAGE_SIZE); 641 } else { 642 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 643 nextp = get_pgd_next_virt(next_phys); 644 } 645 646 create_pgd_next_mapping(nextp, va, pa, sz, prot); 647 } 648 649 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 650 { 651 /* Upgrade to PMD_SIZE mappings whenever possible */ 652 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) 653 return PAGE_SIZE; 654 655 return PMD_SIZE; 656 } 657 658 #ifdef CONFIG_XIP_KERNEL 659 #define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base)) 660 extern char _xiprom[], _exiprom[], __data_loc; 661 662 /* called from head.S with MMU off */ 663 asmlinkage void __init __copy_data(void) 664 { 665 void *from = (void *)(&__data_loc); 666 void *to = (void *)CONFIG_PHYS_RAM_BASE; 667 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata)); 668 669 memcpy(to, from, sz); 670 } 671 #endif 672 673 #ifdef CONFIG_STRICT_KERNEL_RWX 674 static __init pgprot_t pgprot_from_va(uintptr_t va) 675 { 676 if (is_va_kernel_text(va)) 677 return PAGE_KERNEL_READ_EXEC; 678 679 /* 680 * In 64-bit kernel, the kernel mapping is outside the linear mapping so 681 * we must protect its linear mapping alias from being executed and 682 * written. 683 * And rodata section is marked readonly in mark_rodata_ro. 684 */ 685 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va)) 686 return PAGE_KERNEL_READ; 687 688 return PAGE_KERNEL; 689 } 690 691 void mark_rodata_ro(void) 692 { 693 set_kernel_memory(__start_rodata, _data, set_memory_ro); 694 if (IS_ENABLED(CONFIG_64BIT)) 695 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data), 696 set_memory_ro); 697 698 debug_checkwx(); 699 } 700 #else 701 static __init pgprot_t pgprot_from_va(uintptr_t va) 702 { 703 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va)) 704 return PAGE_KERNEL; 705 706 return PAGE_KERNEL_EXEC; 707 } 708 #endif /* CONFIG_STRICT_KERNEL_RWX */ 709 710 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) 711 static void __init disable_pgtable_l5(void) 712 { 713 pgtable_l5_enabled = false; 714 kernel_map.page_offset = PAGE_OFFSET_L4; 715 satp_mode = SATP_MODE_48; 716 } 717 718 static void __init disable_pgtable_l4(void) 719 { 720 pgtable_l4_enabled = false; 721 kernel_map.page_offset = PAGE_OFFSET_L3; 722 satp_mode = SATP_MODE_39; 723 } 724 725 /* 726 * There is a simple way to determine if 4-level is supported by the 727 * underlying hardware: establish 1:1 mapping in 4-level page table mode 728 * then read SATP to see if the configuration was taken into account 729 * meaning sv48 is supported. 730 */ 731 static __init void set_satp_mode(void) 732 { 733 u64 identity_satp, hw_satp; 734 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; 735 bool check_l4 = false; 736 737 create_p4d_mapping(early_p4d, 738 set_satp_mode_pmd, (uintptr_t)early_pud, 739 P4D_SIZE, PAGE_TABLE); 740 create_pud_mapping(early_pud, 741 set_satp_mode_pmd, (uintptr_t)early_pmd, 742 PUD_SIZE, PAGE_TABLE); 743 /* Handle the case where set_satp_mode straddles 2 PMDs */ 744 create_pmd_mapping(early_pmd, 745 set_satp_mode_pmd, set_satp_mode_pmd, 746 PMD_SIZE, PAGE_KERNEL_EXEC); 747 create_pmd_mapping(early_pmd, 748 set_satp_mode_pmd + PMD_SIZE, 749 set_satp_mode_pmd + PMD_SIZE, 750 PMD_SIZE, PAGE_KERNEL_EXEC); 751 retry: 752 create_pgd_mapping(early_pg_dir, 753 set_satp_mode_pmd, 754 check_l4 ? (uintptr_t)early_pud : (uintptr_t)early_p4d, 755 PGDIR_SIZE, PAGE_TABLE); 756 757 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode; 758 759 local_flush_tlb_all(); 760 csr_write(CSR_SATP, identity_satp); 761 hw_satp = csr_swap(CSR_SATP, 0ULL); 762 local_flush_tlb_all(); 763 764 if (hw_satp != identity_satp) { 765 if (!check_l4) { 766 disable_pgtable_l5(); 767 check_l4 = true; 768 memset(early_pg_dir, 0, PAGE_SIZE); 769 goto retry; 770 } 771 disable_pgtable_l4(); 772 } 773 774 memset(early_pg_dir, 0, PAGE_SIZE); 775 memset(early_p4d, 0, PAGE_SIZE); 776 memset(early_pud, 0, PAGE_SIZE); 777 memset(early_pmd, 0, PAGE_SIZE); 778 } 779 #endif 780 781 /* 782 * setup_vm() is called from head.S with MMU-off. 783 * 784 * Following requirements should be honoured for setup_vm() to work 785 * correctly: 786 * 1) It should use PC-relative addressing for accessing kernel symbols. 787 * To achieve this we always use GCC cmodel=medany. 788 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 789 * so disable compiler instrumentation when FTRACE is enabled. 790 * 791 * Currently, the above requirements are honoured by using custom CFLAGS 792 * for init.o in mm/Makefile. 793 */ 794 795 #ifndef __riscv_cmodel_medany 796 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 797 #endif 798 799 #ifdef CONFIG_XIP_KERNEL 800 static void __init create_kernel_page_table(pgd_t *pgdir, 801 __always_unused bool early) 802 { 803 uintptr_t va, end_va; 804 805 /* Map the flash resident part */ 806 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz; 807 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 808 create_pgd_mapping(pgdir, va, 809 kernel_map.xiprom + (va - kernel_map.virt_addr), 810 PMD_SIZE, PAGE_KERNEL_EXEC); 811 812 /* Map the data in RAM */ 813 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size; 814 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE) 815 create_pgd_mapping(pgdir, va, 816 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)), 817 PMD_SIZE, PAGE_KERNEL); 818 } 819 #else 820 static void __init create_kernel_page_table(pgd_t *pgdir, bool early) 821 { 822 uintptr_t va, end_va; 823 824 end_va = kernel_map.virt_addr + kernel_map.size; 825 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 826 create_pgd_mapping(pgdir, va, 827 kernel_map.phys_addr + (va - kernel_map.virt_addr), 828 PMD_SIZE, 829 early ? 830 PAGE_KERNEL_EXEC : pgprot_from_va(va)); 831 } 832 #endif 833 834 /* 835 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel, 836 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR 837 * entry. 838 */ 839 static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa) 840 { 841 #ifndef CONFIG_BUILTIN_DTB 842 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1); 843 844 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 845 IS_ENABLED(CONFIG_64BIT) ? early_dtb_pgd_next : pa, 846 PGDIR_SIZE, 847 IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL); 848 849 if (pgtable_l5_enabled) 850 create_p4d_mapping(early_dtb_p4d, DTB_EARLY_BASE_VA, 851 (uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE); 852 853 if (pgtable_l4_enabled) 854 create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA, 855 (uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE); 856 857 if (IS_ENABLED(CONFIG_64BIT)) { 858 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA, 859 pa, PMD_SIZE, PAGE_KERNEL); 860 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE, 861 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 862 } 863 864 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1)); 865 #else 866 /* 867 * For 64-bit kernel, __va can't be used since it would return a linear 868 * mapping address whereas dtb_early_va will be used before 869 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the 870 * kernel is mapped in the linear mapping, that makes no difference. 871 */ 872 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa)); 873 #endif 874 875 dtb_early_pa = dtb_pa; 876 } 877 878 /* 879 * MMU is not enabled, the page tables are allocated directly using 880 * early_pmd/pud/p4d and the address returned is the physical one. 881 */ 882 static void __init pt_ops_set_early(void) 883 { 884 pt_ops.alloc_pte = alloc_pte_early; 885 pt_ops.get_pte_virt = get_pte_virt_early; 886 #ifndef __PAGETABLE_PMD_FOLDED 887 pt_ops.alloc_pmd = alloc_pmd_early; 888 pt_ops.get_pmd_virt = get_pmd_virt_early; 889 pt_ops.alloc_pud = alloc_pud_early; 890 pt_ops.get_pud_virt = get_pud_virt_early; 891 pt_ops.alloc_p4d = alloc_p4d_early; 892 pt_ops.get_p4d_virt = get_p4d_virt_early; 893 #endif 894 } 895 896 /* 897 * MMU is enabled but page table setup is not complete yet. 898 * fixmap page table alloc functions must be used as a means to temporarily 899 * map the allocated physical pages since the linear mapping does not exist yet. 900 * 901 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va, 902 * but it will be used as described above. 903 */ 904 static void __init pt_ops_set_fixmap(void) 905 { 906 pt_ops.alloc_pte = kernel_mapping_pa_to_va((uintptr_t)alloc_pte_fixmap); 907 pt_ops.get_pte_virt = kernel_mapping_pa_to_va((uintptr_t)get_pte_virt_fixmap); 908 #ifndef __PAGETABLE_PMD_FOLDED 909 pt_ops.alloc_pmd = kernel_mapping_pa_to_va((uintptr_t)alloc_pmd_fixmap); 910 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va((uintptr_t)get_pmd_virt_fixmap); 911 pt_ops.alloc_pud = kernel_mapping_pa_to_va((uintptr_t)alloc_pud_fixmap); 912 pt_ops.get_pud_virt = kernel_mapping_pa_to_va((uintptr_t)get_pud_virt_fixmap); 913 pt_ops.alloc_p4d = kernel_mapping_pa_to_va((uintptr_t)alloc_p4d_fixmap); 914 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va((uintptr_t)get_p4d_virt_fixmap); 915 #endif 916 } 917 918 /* 919 * MMU is enabled and page table setup is complete, so from now, we can use 920 * generic page allocation functions to setup page table. 921 */ 922 static void __init pt_ops_set_late(void) 923 { 924 pt_ops.alloc_pte = alloc_pte_late; 925 pt_ops.get_pte_virt = get_pte_virt_late; 926 #ifndef __PAGETABLE_PMD_FOLDED 927 pt_ops.alloc_pmd = alloc_pmd_late; 928 pt_ops.get_pmd_virt = get_pmd_virt_late; 929 pt_ops.alloc_pud = alloc_pud_late; 930 pt_ops.get_pud_virt = get_pud_virt_late; 931 pt_ops.alloc_p4d = alloc_p4d_late; 932 pt_ops.get_p4d_virt = get_p4d_virt_late; 933 #endif 934 } 935 936 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 937 { 938 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd; 939 940 kernel_map.virt_addr = KERNEL_LINK_ADDR; 941 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL); 942 943 #ifdef CONFIG_XIP_KERNEL 944 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR; 945 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom); 946 947 phys_ram_base = CONFIG_PHYS_RAM_BASE; 948 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE; 949 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata); 950 951 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom; 952 #else 953 kernel_map.phys_addr = (uintptr_t)(&_start); 954 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr; 955 #endif 956 957 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) 958 set_satp_mode(); 959 #endif 960 961 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr; 962 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr; 963 964 riscv_pfn_base = PFN_DOWN(kernel_map.phys_addr); 965 966 /* 967 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit 968 * kernel, whereas for 64-bit kernel, the end of the virtual address 969 * space is occupied by the modules/BPF/kernel mappings which reduces 970 * the available size of the linear mapping. 971 */ 972 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0); 973 974 /* Sanity check alignment and size */ 975 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 976 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0); 977 978 #ifdef CONFIG_64BIT 979 /* 980 * The last 4K bytes of the addressable memory can not be mapped because 981 * of IS_ERR_VALUE macro. 982 */ 983 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K); 984 #endif 985 986 apply_early_boot_alternatives(); 987 pt_ops_set_early(); 988 989 /* Setup early PGD for fixmap */ 990 create_pgd_mapping(early_pg_dir, FIXADDR_START, 991 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 992 993 #ifndef __PAGETABLE_PMD_FOLDED 994 /* Setup fixmap P4D and PUD */ 995 if (pgtable_l5_enabled) 996 create_p4d_mapping(fixmap_p4d, FIXADDR_START, 997 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE); 998 /* Setup fixmap PUD and PMD */ 999 if (pgtable_l4_enabled) 1000 create_pud_mapping(fixmap_pud, FIXADDR_START, 1001 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE); 1002 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 1003 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 1004 /* Setup trampoline PGD and PMD */ 1005 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1006 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE); 1007 if (pgtable_l5_enabled) 1008 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr, 1009 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE); 1010 if (pgtable_l4_enabled) 1011 create_pud_mapping(trampoline_pud, kernel_map.virt_addr, 1012 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE); 1013 #ifdef CONFIG_XIP_KERNEL 1014 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 1015 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC); 1016 #else 1017 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 1018 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC); 1019 #endif 1020 #else 1021 /* Setup trampoline PGD */ 1022 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1023 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC); 1024 #endif 1025 1026 /* 1027 * Setup early PGD covering entire kernel which will allow 1028 * us to reach paging_init(). We map all memory banks later 1029 * in setup_vm_final() below. 1030 */ 1031 create_kernel_page_table(early_pg_dir, true); 1032 1033 /* Setup early mapping for FDT early scan */ 1034 create_fdt_early_page_table(early_pg_dir, dtb_pa); 1035 1036 /* 1037 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 1038 * range can not span multiple pmds. 1039 */ 1040 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 1041 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 1042 1043 #ifndef __PAGETABLE_PMD_FOLDED 1044 /* 1045 * Early ioremap fixmap is already created as it lies within first 2MB 1046 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 1047 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 1048 * the user if not. 1049 */ 1050 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 1051 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 1052 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 1053 WARN_ON(1); 1054 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 1055 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 1056 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 1057 fix_to_virt(FIX_BTMAP_BEGIN)); 1058 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 1059 fix_to_virt(FIX_BTMAP_END)); 1060 1061 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 1062 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 1063 } 1064 #endif 1065 1066 pt_ops_set_fixmap(); 1067 } 1068 1069 static void __init setup_vm_final(void) 1070 { 1071 uintptr_t va, map_size; 1072 phys_addr_t pa, start, end; 1073 u64 i; 1074 1075 /* Setup swapper PGD for fixmap */ 1076 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 1077 __pa_symbol(fixmap_pgd_next), 1078 PGDIR_SIZE, PAGE_TABLE); 1079 1080 /* Map all memory banks in the linear mapping */ 1081 for_each_mem_range(i, &start, &end) { 1082 if (start >= end) 1083 break; 1084 if (start <= __pa(PAGE_OFFSET) && 1085 __pa(PAGE_OFFSET) < end) 1086 start = __pa(PAGE_OFFSET); 1087 if (end >= __pa(PAGE_OFFSET) + memory_limit) 1088 end = __pa(PAGE_OFFSET) + memory_limit; 1089 1090 map_size = best_map_size(start, end - start); 1091 for (pa = start; pa < end; pa += map_size) { 1092 va = (uintptr_t)__va(pa); 1093 1094 create_pgd_mapping(swapper_pg_dir, va, pa, map_size, 1095 pgprot_from_va(va)); 1096 } 1097 } 1098 1099 /* Map the kernel */ 1100 if (IS_ENABLED(CONFIG_64BIT)) 1101 create_kernel_page_table(swapper_pg_dir, false); 1102 1103 #ifdef CONFIG_KASAN 1104 kasan_swapper_init(); 1105 #endif 1106 1107 /* Clear fixmap PTE and PMD mappings */ 1108 clear_fixmap(FIX_PTE); 1109 clear_fixmap(FIX_PMD); 1110 clear_fixmap(FIX_PUD); 1111 clear_fixmap(FIX_P4D); 1112 1113 /* Move to swapper page table */ 1114 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode); 1115 local_flush_tlb_all(); 1116 1117 pt_ops_set_late(); 1118 } 1119 #else 1120 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1121 { 1122 dtb_early_va = (void *)dtb_pa; 1123 dtb_early_pa = dtb_pa; 1124 } 1125 1126 static inline void setup_vm_final(void) 1127 { 1128 } 1129 #endif /* CONFIG_MMU */ 1130 1131 /* 1132 * reserve_crashkernel() - reserves memory for crash kernel 1133 * 1134 * This function reserves memory area given in "crashkernel=" kernel command 1135 * line parameter. The memory reserved is used by dump capture kernel when 1136 * primary kernel is crashing. 1137 */ 1138 static void __init reserve_crashkernel(void) 1139 { 1140 unsigned long long crash_base = 0; 1141 unsigned long long crash_size = 0; 1142 unsigned long search_start = memblock_start_of_DRAM(); 1143 unsigned long search_end = memblock_end_of_DRAM(); 1144 1145 int ret = 0; 1146 1147 if (!IS_ENABLED(CONFIG_KEXEC_CORE)) 1148 return; 1149 /* 1150 * Don't reserve a region for a crash kernel on a crash kernel 1151 * since it doesn't make much sense and we have limited memory 1152 * resources. 1153 */ 1154 if (is_kdump_kernel()) { 1155 pr_info("crashkernel: ignoring reservation request\n"); 1156 return; 1157 } 1158 1159 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), 1160 &crash_size, &crash_base); 1161 if (ret || !crash_size) 1162 return; 1163 1164 crash_size = PAGE_ALIGN(crash_size); 1165 1166 if (crash_base) { 1167 search_start = crash_base; 1168 search_end = crash_base + crash_size; 1169 } 1170 1171 /* 1172 * Current riscv boot protocol requires 2MB alignment for 1173 * RV64 and 4MB alignment for RV32 (hugepage size) 1174 * 1175 * Try to alloc from 32bit addressible physical memory so that 1176 * swiotlb can work on the crash kernel. 1177 */ 1178 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, 1179 search_start, 1180 min(search_end, (unsigned long) SZ_4G)); 1181 if (crash_base == 0) { 1182 /* Try again without restricting region to 32bit addressible memory */ 1183 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, 1184 search_start, search_end); 1185 if (crash_base == 0) { 1186 pr_warn("crashkernel: couldn't allocate %lldKB\n", 1187 crash_size >> 10); 1188 return; 1189 } 1190 } 1191 1192 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n", 1193 crash_base, crash_base + crash_size, crash_size >> 20); 1194 1195 crashk_res.start = crash_base; 1196 crashk_res.end = crash_base + crash_size - 1; 1197 } 1198 1199 void __init paging_init(void) 1200 { 1201 setup_bootmem(); 1202 setup_vm_final(); 1203 } 1204 1205 void __init misc_mem_init(void) 1206 { 1207 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 1208 arch_numa_init(); 1209 sparse_init(); 1210 zone_sizes_init(); 1211 reserve_crashkernel(); 1212 memblock_dump_all(); 1213 } 1214 1215 #ifdef CONFIG_SPARSEMEM_VMEMMAP 1216 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 1217 struct vmem_altmap *altmap) 1218 { 1219 return vmemmap_populate_basepages(start, end, node, NULL); 1220 } 1221 #endif 1222