1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 Regents of the University of California 4 * Copyright (C) 2019 Western Digital Corporation or its affiliates. 5 * Copyright (C) 2020 FORTH-ICS/CARV 6 * Nick Kossifidis <mick@ics.forth.gr> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/mm.h> 11 #include <linux/memblock.h> 12 #include <linux/initrd.h> 13 #include <linux/swap.h> 14 #include <linux/swiotlb.h> 15 #include <linux/sizes.h> 16 #include <linux/of_fdt.h> 17 #include <linux/of_reserved_mem.h> 18 #include <linux/libfdt.h> 19 #include <linux/set_memory.h> 20 #include <linux/dma-map-ops.h> 21 #include <linux/crash_dump.h> 22 #include <linux/hugetlb.h> 23 #ifdef CONFIG_RELOCATABLE 24 #include <linux/elf.h> 25 #endif 26 27 #include <asm/fixmap.h> 28 #include <asm/tlbflush.h> 29 #include <asm/sections.h> 30 #include <asm/soc.h> 31 #include <asm/io.h> 32 #include <asm/ptdump.h> 33 #include <asm/numa.h> 34 35 #include "../kernel/head.h" 36 37 struct kernel_mapping kernel_map __ro_after_init; 38 EXPORT_SYMBOL(kernel_map); 39 #ifdef CONFIG_XIP_KERNEL 40 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map)) 41 #endif 42 43 #ifdef CONFIG_64BIT 44 u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39; 45 #else 46 u64 satp_mode __ro_after_init = SATP_MODE_32; 47 #endif 48 EXPORT_SYMBOL(satp_mode); 49 50 bool pgtable_l4_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL); 51 bool pgtable_l5_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL); 52 EXPORT_SYMBOL(pgtable_l4_enabled); 53 EXPORT_SYMBOL(pgtable_l5_enabled); 54 55 phys_addr_t phys_ram_base __ro_after_init; 56 EXPORT_SYMBOL(phys_ram_base); 57 58 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 59 __page_aligned_bss; 60 EXPORT_SYMBOL(empty_zero_page); 61 62 extern char _start[]; 63 #define DTB_EARLY_BASE_VA PGDIR_SIZE 64 void *_dtb_early_va __initdata; 65 uintptr_t _dtb_early_pa __initdata; 66 67 static phys_addr_t dma32_phys_limit __initdata; 68 69 static void __init zone_sizes_init(void) 70 { 71 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 72 73 #ifdef CONFIG_ZONE_DMA32 74 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); 75 #endif 76 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 77 78 free_area_init(max_zone_pfns); 79 } 80 81 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 82 83 #define LOG2_SZ_1K ilog2(SZ_1K) 84 #define LOG2_SZ_1M ilog2(SZ_1M) 85 #define LOG2_SZ_1G ilog2(SZ_1G) 86 #define LOG2_SZ_1T ilog2(SZ_1T) 87 88 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 89 { 90 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 91 (((t) - (b)) >> LOG2_SZ_1K)); 92 } 93 94 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 95 { 96 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 97 (((t) - (b)) >> LOG2_SZ_1M)); 98 } 99 100 static inline void print_mlg(char *name, unsigned long b, unsigned long t) 101 { 102 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t, 103 (((t) - (b)) >> LOG2_SZ_1G)); 104 } 105 106 #ifdef CONFIG_64BIT 107 static inline void print_mlt(char *name, unsigned long b, unsigned long t) 108 { 109 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t, 110 (((t) - (b)) >> LOG2_SZ_1T)); 111 } 112 #else 113 #define print_mlt(n, b, t) do {} while (0) 114 #endif 115 116 static inline void print_ml(char *name, unsigned long b, unsigned long t) 117 { 118 unsigned long diff = t - b; 119 120 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10) 121 print_mlt(name, b, t); 122 else if ((diff >> LOG2_SZ_1G) >= 10) 123 print_mlg(name, b, t); 124 else if ((diff >> LOG2_SZ_1M) >= 10) 125 print_mlm(name, b, t); 126 else 127 print_mlk(name, b, t); 128 } 129 130 static void __init print_vm_layout(void) 131 { 132 pr_notice("Virtual kernel memory layout:\n"); 133 print_ml("fixmap", (unsigned long)FIXADDR_START, 134 (unsigned long)FIXADDR_TOP); 135 print_ml("pci io", (unsigned long)PCI_IO_START, 136 (unsigned long)PCI_IO_END); 137 print_ml("vmemmap", (unsigned long)VMEMMAP_START, 138 (unsigned long)VMEMMAP_END); 139 print_ml("vmalloc", (unsigned long)VMALLOC_START, 140 (unsigned long)VMALLOC_END); 141 #ifdef CONFIG_64BIT 142 print_ml("modules", (unsigned long)MODULES_VADDR, 143 (unsigned long)MODULES_END); 144 #endif 145 print_ml("lowmem", (unsigned long)PAGE_OFFSET, 146 (unsigned long)high_memory); 147 if (IS_ENABLED(CONFIG_64BIT)) { 148 #ifdef CONFIG_KASAN 149 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END); 150 #endif 151 152 print_ml("kernel", (unsigned long)kernel_map.virt_addr, 153 (unsigned long)ADDRESS_SPACE_END); 154 } 155 } 156 #else 157 static void print_vm_layout(void) { } 158 #endif /* CONFIG_DEBUG_VM */ 159 160 void __init mem_init(void) 161 { 162 #ifdef CONFIG_FLATMEM 163 BUG_ON(!mem_map); 164 #endif /* CONFIG_FLATMEM */ 165 166 swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE); 167 memblock_free_all(); 168 169 print_vm_layout(); 170 } 171 172 /* Limit the memory size via mem. */ 173 static phys_addr_t memory_limit; 174 175 static int __init early_mem(char *p) 176 { 177 u64 size; 178 179 if (!p) 180 return 1; 181 182 size = memparse(p, &p) & PAGE_MASK; 183 memory_limit = min_t(u64, size, memory_limit); 184 185 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20); 186 187 return 0; 188 } 189 early_param("mem", early_mem); 190 191 static void __init setup_bootmem(void) 192 { 193 phys_addr_t vmlinux_end = __pa_symbol(&_end); 194 phys_addr_t max_mapped_addr; 195 phys_addr_t phys_ram_end, vmlinux_start; 196 197 if (IS_ENABLED(CONFIG_XIP_KERNEL)) 198 vmlinux_start = __pa_symbol(&_sdata); 199 else 200 vmlinux_start = __pa_symbol(&_start); 201 202 memblock_enforce_memory_limit(memory_limit); 203 204 /* 205 * Make sure we align the reservation on PMD_SIZE since we will 206 * map the kernel in the linear mapping as read-only: we do not want 207 * any allocation to happen between _end and the next pmd aligned page. 208 */ 209 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX)) 210 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK; 211 /* 212 * Reserve from the start of the kernel to the end of the kernel 213 */ 214 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 215 216 phys_ram_end = memblock_end_of_DRAM(); 217 if (!IS_ENABLED(CONFIG_XIP_KERNEL)) 218 phys_ram_base = memblock_start_of_DRAM(); 219 /* 220 * memblock allocator is not aware of the fact that last 4K bytes of 221 * the addressable memory can not be mapped because of IS_ERR_VALUE 222 * macro. Make sure that last 4k bytes are not usable by memblock 223 * if end of dram is equal to maximum addressable memory. For 64-bit 224 * kernel, this problem can't happen here as the end of the virtual 225 * address space is occupied by the kernel mapping then this check must 226 * be done as soon as the kernel mapping base address is determined. 227 */ 228 if (!IS_ENABLED(CONFIG_64BIT)) { 229 max_mapped_addr = __pa(~(ulong)0); 230 if (max_mapped_addr == (phys_ram_end - 1)) 231 memblock_set_current_limit(max_mapped_addr - 4096); 232 } 233 234 min_low_pfn = PFN_UP(phys_ram_base); 235 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end); 236 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 237 238 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 239 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); 240 241 reserve_initrd_mem(); 242 /* 243 * If DTB is built in, no need to reserve its memblock. 244 * Otherwise, do reserve it but avoid using 245 * early_init_fdt_reserve_self() since __pa() does 246 * not work for DTB pointers that are fixmap addresses 247 */ 248 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) { 249 /* 250 * In case the DTB is not located in a memory region we won't 251 * be able to locate it later on via the linear mapping and 252 * get a segfault when accessing it via __va(dtb_early_pa). 253 * To avoid this situation copy DTB to a memory region. 254 * Note that memblock_phys_alloc will also reserve DTB region. 255 */ 256 if (!memblock_is_memory(dtb_early_pa)) { 257 size_t fdt_size = fdt_totalsize(dtb_early_va); 258 phys_addr_t new_dtb_early_pa = memblock_phys_alloc(fdt_size, PAGE_SIZE); 259 void *new_dtb_early_va = early_memremap(new_dtb_early_pa, fdt_size); 260 261 memcpy(new_dtb_early_va, dtb_early_va, fdt_size); 262 early_memunmap(new_dtb_early_va, fdt_size); 263 _dtb_early_pa = new_dtb_early_pa; 264 } else 265 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 266 } 267 268 dma_contiguous_reserve(dma32_phys_limit); 269 if (IS_ENABLED(CONFIG_64BIT)) 270 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT); 271 memblock_allow_resize(); 272 } 273 274 #ifdef CONFIG_MMU 275 struct pt_alloc_ops pt_ops __initdata; 276 277 unsigned long riscv_pfn_base __ro_after_init; 278 EXPORT_SYMBOL(riscv_pfn_base); 279 280 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 281 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 282 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 283 284 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 285 static p4d_t __maybe_unused early_dtb_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 286 static pud_t __maybe_unused early_dtb_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); 287 static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 288 289 #ifdef CONFIG_XIP_KERNEL 290 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops)) 291 #define riscv_pfn_base (*(unsigned long *)XIP_FIXUP(&riscv_pfn_base)) 292 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir)) 293 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte)) 294 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir)) 295 #endif /* CONFIG_XIP_KERNEL */ 296 297 static const pgprot_t protection_map[16] = { 298 [VM_NONE] = PAGE_NONE, 299 [VM_READ] = PAGE_READ, 300 [VM_WRITE] = PAGE_COPY, 301 [VM_WRITE | VM_READ] = PAGE_COPY, 302 [VM_EXEC] = PAGE_EXEC, 303 [VM_EXEC | VM_READ] = PAGE_READ_EXEC, 304 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC, 305 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_READ_EXEC, 306 [VM_SHARED] = PAGE_NONE, 307 [VM_SHARED | VM_READ] = PAGE_READ, 308 [VM_SHARED | VM_WRITE] = PAGE_SHARED, 309 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED, 310 [VM_SHARED | VM_EXEC] = PAGE_EXEC, 311 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC, 312 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC, 313 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC 314 }; 315 DECLARE_VM_GET_PAGE_PROT 316 317 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 318 { 319 unsigned long addr = __fix_to_virt(idx); 320 pte_t *ptep; 321 322 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 323 324 ptep = &fixmap_pte[pte_index(addr)]; 325 326 if (pgprot_val(prot)) 327 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 328 else 329 pte_clear(&init_mm, addr, ptep); 330 local_flush_tlb_page(addr); 331 } 332 333 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 334 { 335 return (pte_t *)((uintptr_t)pa); 336 } 337 338 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 339 { 340 clear_fixmap(FIX_PTE); 341 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 342 } 343 344 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa) 345 { 346 return (pte_t *) __va(pa); 347 } 348 349 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 350 { 351 /* 352 * We only create PMD or PGD early mappings so we 353 * should never reach here with MMU disabled. 354 */ 355 BUG(); 356 } 357 358 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 359 { 360 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 361 } 362 363 static phys_addr_t __init alloc_pte_late(uintptr_t va) 364 { 365 unsigned long vaddr; 366 367 vaddr = __get_free_page(GFP_KERNEL); 368 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr))); 369 370 return __pa(vaddr); 371 } 372 373 static void __init create_pte_mapping(pte_t *ptep, 374 uintptr_t va, phys_addr_t pa, 375 phys_addr_t sz, pgprot_t prot) 376 { 377 uintptr_t pte_idx = pte_index(va); 378 379 BUG_ON(sz != PAGE_SIZE); 380 381 if (pte_none(ptep[pte_idx])) 382 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 383 } 384 385 #ifndef __PAGETABLE_PMD_FOLDED 386 387 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 388 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 389 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 390 391 #ifdef CONFIG_XIP_KERNEL 392 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd)) 393 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd)) 394 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd)) 395 #endif /* CONFIG_XIP_KERNEL */ 396 397 static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss; 398 static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss; 399 static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE); 400 401 #ifdef CONFIG_XIP_KERNEL 402 #define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d)) 403 #define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d)) 404 #define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d)) 405 #endif /* CONFIG_XIP_KERNEL */ 406 407 static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss; 408 static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss; 409 static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE); 410 411 #ifdef CONFIG_XIP_KERNEL 412 #define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud)) 413 #define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud)) 414 #define early_pud ((pud_t *)XIP_FIXUP(early_pud)) 415 #endif /* CONFIG_XIP_KERNEL */ 416 417 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 418 { 419 /* Before MMU is enabled */ 420 return (pmd_t *)((uintptr_t)pa); 421 } 422 423 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 424 { 425 clear_fixmap(FIX_PMD); 426 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 427 } 428 429 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa) 430 { 431 return (pmd_t *) __va(pa); 432 } 433 434 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 435 { 436 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT); 437 438 return (uintptr_t)early_pmd; 439 } 440 441 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 442 { 443 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 444 } 445 446 static phys_addr_t __init alloc_pmd_late(uintptr_t va) 447 { 448 unsigned long vaddr; 449 450 vaddr = __get_free_page(GFP_KERNEL); 451 BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr))); 452 453 return __pa(vaddr); 454 } 455 456 static void __init create_pmd_mapping(pmd_t *pmdp, 457 uintptr_t va, phys_addr_t pa, 458 phys_addr_t sz, pgprot_t prot) 459 { 460 pte_t *ptep; 461 phys_addr_t pte_phys; 462 uintptr_t pmd_idx = pmd_index(va); 463 464 if (sz == PMD_SIZE) { 465 if (pmd_none(pmdp[pmd_idx])) 466 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 467 return; 468 } 469 470 if (pmd_none(pmdp[pmd_idx])) { 471 pte_phys = pt_ops.alloc_pte(va); 472 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 473 ptep = pt_ops.get_pte_virt(pte_phys); 474 memset(ptep, 0, PAGE_SIZE); 475 } else { 476 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 477 ptep = pt_ops.get_pte_virt(pte_phys); 478 } 479 480 create_pte_mapping(ptep, va, pa, sz, prot); 481 } 482 483 static pud_t *__init get_pud_virt_early(phys_addr_t pa) 484 { 485 return (pud_t *)((uintptr_t)pa); 486 } 487 488 static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa) 489 { 490 clear_fixmap(FIX_PUD); 491 return (pud_t *)set_fixmap_offset(FIX_PUD, pa); 492 } 493 494 static pud_t *__init get_pud_virt_late(phys_addr_t pa) 495 { 496 return (pud_t *)__va(pa); 497 } 498 499 static phys_addr_t __init alloc_pud_early(uintptr_t va) 500 { 501 /* Only one PUD is available for early mapping */ 502 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 503 504 return (uintptr_t)early_pud; 505 } 506 507 static phys_addr_t __init alloc_pud_fixmap(uintptr_t va) 508 { 509 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 510 } 511 512 static phys_addr_t alloc_pud_late(uintptr_t va) 513 { 514 unsigned long vaddr; 515 516 vaddr = __get_free_page(GFP_KERNEL); 517 BUG_ON(!vaddr); 518 return __pa(vaddr); 519 } 520 521 static p4d_t *__init get_p4d_virt_early(phys_addr_t pa) 522 { 523 return (p4d_t *)((uintptr_t)pa); 524 } 525 526 static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa) 527 { 528 clear_fixmap(FIX_P4D); 529 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa); 530 } 531 532 static p4d_t *__init get_p4d_virt_late(phys_addr_t pa) 533 { 534 return (p4d_t *)__va(pa); 535 } 536 537 static phys_addr_t __init alloc_p4d_early(uintptr_t va) 538 { 539 /* Only one P4D is available for early mapping */ 540 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 541 542 return (uintptr_t)early_p4d; 543 } 544 545 static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va) 546 { 547 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 548 } 549 550 static phys_addr_t alloc_p4d_late(uintptr_t va) 551 { 552 unsigned long vaddr; 553 554 vaddr = __get_free_page(GFP_KERNEL); 555 BUG_ON(!vaddr); 556 return __pa(vaddr); 557 } 558 559 static void __init create_pud_mapping(pud_t *pudp, 560 uintptr_t va, phys_addr_t pa, 561 phys_addr_t sz, pgprot_t prot) 562 { 563 pmd_t *nextp; 564 phys_addr_t next_phys; 565 uintptr_t pud_index = pud_index(va); 566 567 if (sz == PUD_SIZE) { 568 if (pud_val(pudp[pud_index]) == 0) 569 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot); 570 return; 571 } 572 573 if (pud_val(pudp[pud_index]) == 0) { 574 next_phys = pt_ops.alloc_pmd(va); 575 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE); 576 nextp = pt_ops.get_pmd_virt(next_phys); 577 memset(nextp, 0, PAGE_SIZE); 578 } else { 579 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index])); 580 nextp = pt_ops.get_pmd_virt(next_phys); 581 } 582 583 create_pmd_mapping(nextp, va, pa, sz, prot); 584 } 585 586 static void __init create_p4d_mapping(p4d_t *p4dp, 587 uintptr_t va, phys_addr_t pa, 588 phys_addr_t sz, pgprot_t prot) 589 { 590 pud_t *nextp; 591 phys_addr_t next_phys; 592 uintptr_t p4d_index = p4d_index(va); 593 594 if (sz == P4D_SIZE) { 595 if (p4d_val(p4dp[p4d_index]) == 0) 596 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot); 597 return; 598 } 599 600 if (p4d_val(p4dp[p4d_index]) == 0) { 601 next_phys = pt_ops.alloc_pud(va); 602 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE); 603 nextp = pt_ops.get_pud_virt(next_phys); 604 memset(nextp, 0, PAGE_SIZE); 605 } else { 606 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index])); 607 nextp = pt_ops.get_pud_virt(next_phys); 608 } 609 610 create_pud_mapping(nextp, va, pa, sz, prot); 611 } 612 613 #define pgd_next_t p4d_t 614 #define alloc_pgd_next(__va) (pgtable_l5_enabled ? \ 615 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \ 616 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va))) 617 #define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \ 618 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \ 619 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa))) 620 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 621 (pgtable_l5_enabled ? \ 622 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \ 623 (pgtable_l4_enabled ? \ 624 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \ 625 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot))) 626 #define fixmap_pgd_next (pgtable_l5_enabled ? \ 627 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \ 628 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd)) 629 #define trampoline_pgd_next (pgtable_l5_enabled ? \ 630 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \ 631 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd)) 632 #define early_dtb_pgd_next (pgtable_l5_enabled ? \ 633 (uintptr_t)early_dtb_p4d : (pgtable_l4_enabled ? \ 634 (uintptr_t)early_dtb_pud : (uintptr_t)early_dtb_pmd)) 635 #else 636 #define pgd_next_t pte_t 637 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 638 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 639 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 640 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 641 #define fixmap_pgd_next ((uintptr_t)fixmap_pte) 642 #define early_dtb_pgd_next ((uintptr_t)early_dtb_pmd) 643 #define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 644 #define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 645 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0) 646 #endif /* __PAGETABLE_PMD_FOLDED */ 647 648 void __init create_pgd_mapping(pgd_t *pgdp, 649 uintptr_t va, phys_addr_t pa, 650 phys_addr_t sz, pgprot_t prot) 651 { 652 pgd_next_t *nextp; 653 phys_addr_t next_phys; 654 uintptr_t pgd_idx = pgd_index(va); 655 656 if (sz == PGDIR_SIZE) { 657 if (pgd_val(pgdp[pgd_idx]) == 0) 658 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 659 return; 660 } 661 662 if (pgd_val(pgdp[pgd_idx]) == 0) { 663 next_phys = alloc_pgd_next(va); 664 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 665 nextp = get_pgd_next_virt(next_phys); 666 memset(nextp, 0, PAGE_SIZE); 667 } else { 668 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 669 nextp = get_pgd_next_virt(next_phys); 670 } 671 672 create_pgd_next_mapping(nextp, va, pa, sz, prot); 673 } 674 675 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 676 { 677 /* Upgrade to PMD_SIZE mappings whenever possible */ 678 base &= PMD_SIZE - 1; 679 if (!base && size >= PMD_SIZE) 680 return PMD_SIZE; 681 682 return PAGE_SIZE; 683 } 684 685 #ifdef CONFIG_XIP_KERNEL 686 #define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base)) 687 extern char _xiprom[], _exiprom[], __data_loc; 688 689 /* called from head.S with MMU off */ 690 asmlinkage void __init __copy_data(void) 691 { 692 void *from = (void *)(&__data_loc); 693 void *to = (void *)CONFIG_PHYS_RAM_BASE; 694 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata)); 695 696 memcpy(to, from, sz); 697 } 698 #endif 699 700 #ifdef CONFIG_STRICT_KERNEL_RWX 701 static __init pgprot_t pgprot_from_va(uintptr_t va) 702 { 703 if (is_va_kernel_text(va)) 704 return PAGE_KERNEL_READ_EXEC; 705 706 /* 707 * In 64-bit kernel, the kernel mapping is outside the linear mapping so 708 * we must protect its linear mapping alias from being executed and 709 * written. 710 * And rodata section is marked readonly in mark_rodata_ro. 711 */ 712 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va)) 713 return PAGE_KERNEL_READ; 714 715 return PAGE_KERNEL; 716 } 717 718 void mark_rodata_ro(void) 719 { 720 set_kernel_memory(__start_rodata, _data, set_memory_ro); 721 if (IS_ENABLED(CONFIG_64BIT)) 722 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data), 723 set_memory_ro); 724 725 debug_checkwx(); 726 } 727 #else 728 static __init pgprot_t pgprot_from_va(uintptr_t va) 729 { 730 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va)) 731 return PAGE_KERNEL; 732 733 return PAGE_KERNEL_EXEC; 734 } 735 #endif /* CONFIG_STRICT_KERNEL_RWX */ 736 737 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) 738 static void __init disable_pgtable_l5(void) 739 { 740 pgtable_l5_enabled = false; 741 kernel_map.page_offset = PAGE_OFFSET_L4; 742 satp_mode = SATP_MODE_48; 743 } 744 745 static void __init disable_pgtable_l4(void) 746 { 747 pgtable_l4_enabled = false; 748 kernel_map.page_offset = PAGE_OFFSET_L3; 749 satp_mode = SATP_MODE_39; 750 } 751 752 /* 753 * There is a simple way to determine if 4-level is supported by the 754 * underlying hardware: establish 1:1 mapping in 4-level page table mode 755 * then read SATP to see if the configuration was taken into account 756 * meaning sv48 is supported. 757 */ 758 static __init void set_satp_mode(void) 759 { 760 u64 identity_satp, hw_satp; 761 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK; 762 bool check_l4 = false; 763 764 create_p4d_mapping(early_p4d, 765 set_satp_mode_pmd, (uintptr_t)early_pud, 766 P4D_SIZE, PAGE_TABLE); 767 create_pud_mapping(early_pud, 768 set_satp_mode_pmd, (uintptr_t)early_pmd, 769 PUD_SIZE, PAGE_TABLE); 770 /* Handle the case where set_satp_mode straddles 2 PMDs */ 771 create_pmd_mapping(early_pmd, 772 set_satp_mode_pmd, set_satp_mode_pmd, 773 PMD_SIZE, PAGE_KERNEL_EXEC); 774 create_pmd_mapping(early_pmd, 775 set_satp_mode_pmd + PMD_SIZE, 776 set_satp_mode_pmd + PMD_SIZE, 777 PMD_SIZE, PAGE_KERNEL_EXEC); 778 retry: 779 create_pgd_mapping(early_pg_dir, 780 set_satp_mode_pmd, 781 check_l4 ? (uintptr_t)early_pud : (uintptr_t)early_p4d, 782 PGDIR_SIZE, PAGE_TABLE); 783 784 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode; 785 786 local_flush_tlb_all(); 787 csr_write(CSR_SATP, identity_satp); 788 hw_satp = csr_swap(CSR_SATP, 0ULL); 789 local_flush_tlb_all(); 790 791 if (hw_satp != identity_satp) { 792 if (!check_l4) { 793 disable_pgtable_l5(); 794 check_l4 = true; 795 memset(early_pg_dir, 0, PAGE_SIZE); 796 goto retry; 797 } 798 disable_pgtable_l4(); 799 } 800 801 memset(early_pg_dir, 0, PAGE_SIZE); 802 memset(early_p4d, 0, PAGE_SIZE); 803 memset(early_pud, 0, PAGE_SIZE); 804 memset(early_pmd, 0, PAGE_SIZE); 805 } 806 #endif 807 808 /* 809 * setup_vm() is called from head.S with MMU-off. 810 * 811 * Following requirements should be honoured for setup_vm() to work 812 * correctly: 813 * 1) It should use PC-relative addressing for accessing kernel symbols. 814 * To achieve this we always use GCC cmodel=medany. 815 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 816 * so disable compiler instrumentation when FTRACE is enabled. 817 * 818 * Currently, the above requirements are honoured by using custom CFLAGS 819 * for init.o in mm/Makefile. 820 */ 821 822 #ifndef __riscv_cmodel_medany 823 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 824 #endif 825 826 #ifdef CONFIG_RELOCATABLE 827 extern unsigned long __rela_dyn_start, __rela_dyn_end; 828 829 static void __init relocate_kernel(void) 830 { 831 Elf64_Rela *rela = (Elf64_Rela *)&__rela_dyn_start; 832 /* 833 * This holds the offset between the linked virtual address and the 834 * relocated virtual address. 835 */ 836 uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR; 837 /* 838 * This holds the offset between kernel linked virtual address and 839 * physical address. 840 */ 841 uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr; 842 843 for ( ; rela < (Elf64_Rela *)&__rela_dyn_end; rela++) { 844 Elf64_Addr addr = (rela->r_offset - va_kernel_link_pa_offset); 845 Elf64_Addr relocated_addr = rela->r_addend; 846 847 if (rela->r_info != R_RISCV_RELATIVE) 848 continue; 849 850 /* 851 * Make sure to not relocate vdso symbols like rt_sigreturn 852 * which are linked from the address 0 in vmlinux since 853 * vdso symbol addresses are actually used as an offset from 854 * mm->context.vdso in VDSO_OFFSET macro. 855 */ 856 if (relocated_addr >= KERNEL_LINK_ADDR) 857 relocated_addr += reloc_offset; 858 859 *(Elf64_Addr *)addr = relocated_addr; 860 } 861 } 862 #endif /* CONFIG_RELOCATABLE */ 863 864 #ifdef CONFIG_XIP_KERNEL 865 static void __init create_kernel_page_table(pgd_t *pgdir, 866 __always_unused bool early) 867 { 868 uintptr_t va, end_va; 869 870 /* Map the flash resident part */ 871 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz; 872 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 873 create_pgd_mapping(pgdir, va, 874 kernel_map.xiprom + (va - kernel_map.virt_addr), 875 PMD_SIZE, PAGE_KERNEL_EXEC); 876 877 /* Map the data in RAM */ 878 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size; 879 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE) 880 create_pgd_mapping(pgdir, va, 881 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)), 882 PMD_SIZE, PAGE_KERNEL); 883 } 884 #else 885 static void __init create_kernel_page_table(pgd_t *pgdir, bool early) 886 { 887 uintptr_t va, end_va; 888 889 end_va = kernel_map.virt_addr + kernel_map.size; 890 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE) 891 create_pgd_mapping(pgdir, va, 892 kernel_map.phys_addr + (va - kernel_map.virt_addr), 893 PMD_SIZE, 894 early ? 895 PAGE_KERNEL_EXEC : pgprot_from_va(va)); 896 } 897 #endif 898 899 /* 900 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel, 901 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR 902 * entry. 903 */ 904 static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa) 905 { 906 #ifndef CONFIG_BUILTIN_DTB 907 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1); 908 909 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 910 IS_ENABLED(CONFIG_64BIT) ? early_dtb_pgd_next : pa, 911 PGDIR_SIZE, 912 IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL); 913 914 if (pgtable_l5_enabled) 915 create_p4d_mapping(early_dtb_p4d, DTB_EARLY_BASE_VA, 916 (uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE); 917 918 if (pgtable_l4_enabled) 919 create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA, 920 (uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE); 921 922 if (IS_ENABLED(CONFIG_64BIT)) { 923 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA, 924 pa, PMD_SIZE, PAGE_KERNEL); 925 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE, 926 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 927 } 928 929 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1)); 930 #else 931 /* 932 * For 64-bit kernel, __va can't be used since it would return a linear 933 * mapping address whereas dtb_early_va will be used before 934 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the 935 * kernel is mapped in the linear mapping, that makes no difference. 936 */ 937 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa)); 938 #endif 939 940 dtb_early_pa = dtb_pa; 941 } 942 943 /* 944 * MMU is not enabled, the page tables are allocated directly using 945 * early_pmd/pud/p4d and the address returned is the physical one. 946 */ 947 static void __init pt_ops_set_early(void) 948 { 949 pt_ops.alloc_pte = alloc_pte_early; 950 pt_ops.get_pte_virt = get_pte_virt_early; 951 #ifndef __PAGETABLE_PMD_FOLDED 952 pt_ops.alloc_pmd = alloc_pmd_early; 953 pt_ops.get_pmd_virt = get_pmd_virt_early; 954 pt_ops.alloc_pud = alloc_pud_early; 955 pt_ops.get_pud_virt = get_pud_virt_early; 956 pt_ops.alloc_p4d = alloc_p4d_early; 957 pt_ops.get_p4d_virt = get_p4d_virt_early; 958 #endif 959 } 960 961 /* 962 * MMU is enabled but page table setup is not complete yet. 963 * fixmap page table alloc functions must be used as a means to temporarily 964 * map the allocated physical pages since the linear mapping does not exist yet. 965 * 966 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va, 967 * but it will be used as described above. 968 */ 969 static void __init pt_ops_set_fixmap(void) 970 { 971 pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap); 972 pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap); 973 #ifndef __PAGETABLE_PMD_FOLDED 974 pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap); 975 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap); 976 pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap); 977 pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap); 978 pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap); 979 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap); 980 #endif 981 } 982 983 /* 984 * MMU is enabled and page table setup is complete, so from now, we can use 985 * generic page allocation functions to setup page table. 986 */ 987 static void __init pt_ops_set_late(void) 988 { 989 pt_ops.alloc_pte = alloc_pte_late; 990 pt_ops.get_pte_virt = get_pte_virt_late; 991 #ifndef __PAGETABLE_PMD_FOLDED 992 pt_ops.alloc_pmd = alloc_pmd_late; 993 pt_ops.get_pmd_virt = get_pmd_virt_late; 994 pt_ops.alloc_pud = alloc_pud_late; 995 pt_ops.get_pud_virt = get_pud_virt_late; 996 pt_ops.alloc_p4d = alloc_p4d_late; 997 pt_ops.get_p4d_virt = get_p4d_virt_late; 998 #endif 999 } 1000 1001 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1002 { 1003 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd; 1004 1005 kernel_map.virt_addr = KERNEL_LINK_ADDR; 1006 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL); 1007 1008 #ifdef CONFIG_XIP_KERNEL 1009 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR; 1010 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom); 1011 1012 phys_ram_base = CONFIG_PHYS_RAM_BASE; 1013 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE; 1014 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata); 1015 1016 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom; 1017 #else 1018 kernel_map.phys_addr = (uintptr_t)(&_start); 1019 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr; 1020 #endif 1021 1022 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL) 1023 set_satp_mode(); 1024 #endif 1025 1026 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr; 1027 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr; 1028 1029 riscv_pfn_base = PFN_DOWN(kernel_map.phys_addr); 1030 1031 /* 1032 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit 1033 * kernel, whereas for 64-bit kernel, the end of the virtual address 1034 * space is occupied by the modules/BPF/kernel mappings which reduces 1035 * the available size of the linear mapping. 1036 */ 1037 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0); 1038 1039 /* Sanity check alignment and size */ 1040 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 1041 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0); 1042 1043 #ifdef CONFIG_64BIT 1044 /* 1045 * The last 4K bytes of the addressable memory can not be mapped because 1046 * of IS_ERR_VALUE macro. 1047 */ 1048 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K); 1049 #endif 1050 1051 #ifdef CONFIG_RELOCATABLE 1052 /* 1053 * Early page table uses only one PUD, which makes it possible 1054 * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset 1055 * makes the kernel cross over a PUD_SIZE boundary, raise a bug 1056 * since a part of the kernel would not get mapped. 1057 */ 1058 BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size); 1059 relocate_kernel(); 1060 #endif 1061 1062 apply_early_boot_alternatives(); 1063 pt_ops_set_early(); 1064 1065 /* Setup early PGD for fixmap */ 1066 create_pgd_mapping(early_pg_dir, FIXADDR_START, 1067 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 1068 1069 #ifndef __PAGETABLE_PMD_FOLDED 1070 /* Setup fixmap P4D and PUD */ 1071 if (pgtable_l5_enabled) 1072 create_p4d_mapping(fixmap_p4d, FIXADDR_START, 1073 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE); 1074 /* Setup fixmap PUD and PMD */ 1075 if (pgtable_l4_enabled) 1076 create_pud_mapping(fixmap_pud, FIXADDR_START, 1077 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE); 1078 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 1079 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 1080 /* Setup trampoline PGD and PMD */ 1081 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1082 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE); 1083 if (pgtable_l5_enabled) 1084 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr, 1085 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE); 1086 if (pgtable_l4_enabled) 1087 create_pud_mapping(trampoline_pud, kernel_map.virt_addr, 1088 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE); 1089 #ifdef CONFIG_XIP_KERNEL 1090 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 1091 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC); 1092 #else 1093 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 1094 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC); 1095 #endif 1096 #else 1097 /* Setup trampoline PGD */ 1098 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 1099 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC); 1100 #endif 1101 1102 /* 1103 * Setup early PGD covering entire kernel which will allow 1104 * us to reach paging_init(). We map all memory banks later 1105 * in setup_vm_final() below. 1106 */ 1107 create_kernel_page_table(early_pg_dir, true); 1108 1109 /* Setup early mapping for FDT early scan */ 1110 create_fdt_early_page_table(early_pg_dir, dtb_pa); 1111 1112 /* 1113 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 1114 * range can not span multiple pmds. 1115 */ 1116 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 1117 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 1118 1119 #ifndef __PAGETABLE_PMD_FOLDED 1120 /* 1121 * Early ioremap fixmap is already created as it lies within first 2MB 1122 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 1123 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 1124 * the user if not. 1125 */ 1126 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 1127 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 1128 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 1129 WARN_ON(1); 1130 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 1131 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 1132 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 1133 fix_to_virt(FIX_BTMAP_BEGIN)); 1134 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 1135 fix_to_virt(FIX_BTMAP_END)); 1136 1137 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 1138 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 1139 } 1140 #endif 1141 1142 pt_ops_set_fixmap(); 1143 } 1144 1145 static void __init setup_vm_final(void) 1146 { 1147 uintptr_t va, map_size; 1148 phys_addr_t pa, start, end; 1149 u64 i; 1150 1151 /* Setup swapper PGD for fixmap */ 1152 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 1153 __pa_symbol(fixmap_pgd_next), 1154 PGDIR_SIZE, PAGE_TABLE); 1155 1156 /* Map all memory banks in the linear mapping */ 1157 for_each_mem_range(i, &start, &end) { 1158 if (start >= end) 1159 break; 1160 if (start <= __pa(PAGE_OFFSET) && 1161 __pa(PAGE_OFFSET) < end) 1162 start = __pa(PAGE_OFFSET); 1163 if (end >= __pa(PAGE_OFFSET) + memory_limit) 1164 end = __pa(PAGE_OFFSET) + memory_limit; 1165 1166 for (pa = start; pa < end; pa += map_size) { 1167 va = (uintptr_t)__va(pa); 1168 map_size = best_map_size(pa, end - pa); 1169 1170 create_pgd_mapping(swapper_pg_dir, va, pa, map_size, 1171 pgprot_from_va(va)); 1172 } 1173 } 1174 1175 /* Map the kernel */ 1176 if (IS_ENABLED(CONFIG_64BIT)) 1177 create_kernel_page_table(swapper_pg_dir, false); 1178 1179 #ifdef CONFIG_KASAN 1180 kasan_swapper_init(); 1181 #endif 1182 1183 /* Clear fixmap PTE and PMD mappings */ 1184 clear_fixmap(FIX_PTE); 1185 clear_fixmap(FIX_PMD); 1186 clear_fixmap(FIX_PUD); 1187 clear_fixmap(FIX_P4D); 1188 1189 /* Move to swapper page table */ 1190 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode); 1191 local_flush_tlb_all(); 1192 1193 pt_ops_set_late(); 1194 } 1195 #else 1196 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 1197 { 1198 dtb_early_va = (void *)dtb_pa; 1199 dtb_early_pa = dtb_pa; 1200 } 1201 1202 static inline void setup_vm_final(void) 1203 { 1204 } 1205 #endif /* CONFIG_MMU */ 1206 1207 /* 1208 * reserve_crashkernel() - reserves memory for crash kernel 1209 * 1210 * This function reserves memory area given in "crashkernel=" kernel command 1211 * line parameter. The memory reserved is used by dump capture kernel when 1212 * primary kernel is crashing. 1213 */ 1214 static void __init reserve_crashkernel(void) 1215 { 1216 unsigned long long crash_base = 0; 1217 unsigned long long crash_size = 0; 1218 unsigned long search_start = memblock_start_of_DRAM(); 1219 unsigned long search_end = memblock_end_of_DRAM(); 1220 1221 int ret = 0; 1222 1223 if (!IS_ENABLED(CONFIG_KEXEC_CORE)) 1224 return; 1225 /* 1226 * Don't reserve a region for a crash kernel on a crash kernel 1227 * since it doesn't make much sense and we have limited memory 1228 * resources. 1229 */ 1230 if (is_kdump_kernel()) { 1231 pr_info("crashkernel: ignoring reservation request\n"); 1232 return; 1233 } 1234 1235 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), 1236 &crash_size, &crash_base); 1237 if (ret || !crash_size) 1238 return; 1239 1240 crash_size = PAGE_ALIGN(crash_size); 1241 1242 if (crash_base) { 1243 search_start = crash_base; 1244 search_end = crash_base + crash_size; 1245 } 1246 1247 /* 1248 * Current riscv boot protocol requires 2MB alignment for 1249 * RV64 and 4MB alignment for RV32 (hugepage size) 1250 * 1251 * Try to alloc from 32bit addressible physical memory so that 1252 * swiotlb can work on the crash kernel. 1253 */ 1254 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, 1255 search_start, 1256 min(search_end, (unsigned long) SZ_4G)); 1257 if (crash_base == 0) { 1258 /* Try again without restricting region to 32bit addressible memory */ 1259 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE, 1260 search_start, search_end); 1261 if (crash_base == 0) { 1262 pr_warn("crashkernel: couldn't allocate %lldKB\n", 1263 crash_size >> 10); 1264 return; 1265 } 1266 } 1267 1268 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n", 1269 crash_base, crash_base + crash_size, crash_size >> 20); 1270 1271 crashk_res.start = crash_base; 1272 crashk_res.end = crash_base + crash_size - 1; 1273 } 1274 1275 void __init paging_init(void) 1276 { 1277 setup_bootmem(); 1278 setup_vm_final(); 1279 } 1280 1281 void __init misc_mem_init(void) 1282 { 1283 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 1284 arch_numa_init(); 1285 sparse_init(); 1286 zone_sizes_init(); 1287 reserve_crashkernel(); 1288 memblock_dump_all(); 1289 } 1290 1291 #ifdef CONFIG_SPARSEMEM_VMEMMAP 1292 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 1293 struct vmem_altmap *altmap) 1294 { 1295 return vmemmap_populate_basepages(start, end, node, NULL); 1296 } 1297 #endif 1298