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 23 #include <asm/fixmap.h> 24 #include <asm/tlbflush.h> 25 #include <asm/sections.h> 26 #include <asm/soc.h> 27 #include <asm/io.h> 28 #include <asm/ptdump.h> 29 #include <asm/numa.h> 30 31 #include "../kernel/head.h" 32 33 struct kernel_mapping kernel_map __ro_after_init; 34 EXPORT_SYMBOL(kernel_map); 35 #ifdef CONFIG_XIP_KERNEL 36 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map)) 37 #endif 38 39 #ifdef CONFIG_XIP_KERNEL 40 extern char _xiprom[], _exiprom[]; 41 #endif 42 43 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] 44 __page_aligned_bss; 45 EXPORT_SYMBOL(empty_zero_page); 46 47 extern char _start[]; 48 #define DTB_EARLY_BASE_VA PGDIR_SIZE 49 void *_dtb_early_va __initdata; 50 uintptr_t _dtb_early_pa __initdata; 51 52 struct pt_alloc_ops { 53 pte_t *(*get_pte_virt)(phys_addr_t pa); 54 phys_addr_t (*alloc_pte)(uintptr_t va); 55 #ifndef __PAGETABLE_PMD_FOLDED 56 pmd_t *(*get_pmd_virt)(phys_addr_t pa); 57 phys_addr_t (*alloc_pmd)(uintptr_t va); 58 #endif 59 }; 60 61 static phys_addr_t dma32_phys_limit __initdata; 62 63 static void __init zone_sizes_init(void) 64 { 65 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, }; 66 67 #ifdef CONFIG_ZONE_DMA32 68 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit); 69 #endif 70 max_zone_pfns[ZONE_NORMAL] = max_low_pfn; 71 72 free_area_init(max_zone_pfns); 73 } 74 75 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM) 76 static inline void print_mlk(char *name, unsigned long b, unsigned long t) 77 { 78 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t, 79 (((t) - (b)) >> 10)); 80 } 81 82 static inline void print_mlm(char *name, unsigned long b, unsigned long t) 83 { 84 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t, 85 (((t) - (b)) >> 20)); 86 } 87 88 static void __init print_vm_layout(void) 89 { 90 pr_notice("Virtual kernel memory layout:\n"); 91 print_mlk("fixmap", (unsigned long)FIXADDR_START, 92 (unsigned long)FIXADDR_TOP); 93 print_mlm("pci io", (unsigned long)PCI_IO_START, 94 (unsigned long)PCI_IO_END); 95 print_mlm("vmemmap", (unsigned long)VMEMMAP_START, 96 (unsigned long)VMEMMAP_END); 97 print_mlm("vmalloc", (unsigned long)VMALLOC_START, 98 (unsigned long)VMALLOC_END); 99 print_mlm("lowmem", (unsigned long)PAGE_OFFSET, 100 (unsigned long)high_memory); 101 #ifdef CONFIG_64BIT 102 print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR, 103 (unsigned long)ADDRESS_SPACE_END); 104 #endif 105 } 106 #else 107 static void print_vm_layout(void) { } 108 #endif /* CONFIG_DEBUG_VM */ 109 110 void __init mem_init(void) 111 { 112 #ifdef CONFIG_FLATMEM 113 BUG_ON(!mem_map); 114 #endif /* CONFIG_FLATMEM */ 115 116 #ifdef CONFIG_SWIOTLB 117 if (swiotlb_force == SWIOTLB_FORCE || 118 max_pfn > PFN_DOWN(dma32_phys_limit)) 119 swiotlb_init(1); 120 else 121 swiotlb_force = SWIOTLB_NO_FORCE; 122 #endif 123 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn))); 124 memblock_free_all(); 125 126 print_vm_layout(); 127 } 128 129 /* 130 * The default maximal physical memory size is -PAGE_OFFSET for 32-bit kernel, 131 * whereas for 64-bit kernel, the end of the virtual address space is occupied 132 * by the modules/BPF/kernel mappings which reduces the available size of the 133 * linear mapping. 134 * Limit the memory size via mem. 135 */ 136 #ifdef CONFIG_64BIT 137 static phys_addr_t memory_limit = -PAGE_OFFSET - SZ_4G; 138 #else 139 static phys_addr_t memory_limit = -PAGE_OFFSET; 140 #endif 141 142 static int __init early_mem(char *p) 143 { 144 u64 size; 145 146 if (!p) 147 return 1; 148 149 size = memparse(p, &p) & PAGE_MASK; 150 memory_limit = min_t(u64, size, memory_limit); 151 152 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20); 153 154 return 0; 155 } 156 early_param("mem", early_mem); 157 158 static void __init setup_bootmem(void) 159 { 160 phys_addr_t vmlinux_end = __pa_symbol(&_end); 161 phys_addr_t vmlinux_start = __pa_symbol(&_start); 162 phys_addr_t __maybe_unused max_mapped_addr; 163 phys_addr_t dram_end; 164 165 #ifdef CONFIG_XIP_KERNEL 166 vmlinux_start = __pa_symbol(&_sdata); 167 #endif 168 169 memblock_enforce_memory_limit(memory_limit); 170 171 /* 172 * Reserve from the start of the kernel to the end of the kernel 173 */ 174 #if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX) 175 /* 176 * Make sure we align the reservation on PMD_SIZE since we will 177 * map the kernel in the linear mapping as read-only: we do not want 178 * any allocation to happen between _end and the next pmd aligned page. 179 */ 180 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK; 181 #endif 182 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); 183 184 dram_end = memblock_end_of_DRAM(); 185 186 #ifndef CONFIG_64BIT 187 /* 188 * memblock allocator is not aware of the fact that last 4K bytes of 189 * the addressable memory can not be mapped because of IS_ERR_VALUE 190 * macro. Make sure that last 4k bytes are not usable by memblock 191 * if end of dram is equal to maximum addressable memory. For 64-bit 192 * kernel, this problem can't happen here as the end of the virtual 193 * address space is occupied by the kernel mapping then this check must 194 * be done in create_kernel_page_table. 195 */ 196 max_mapped_addr = __pa(~(ulong)0); 197 if (max_mapped_addr == (dram_end - 1)) 198 memblock_set_current_limit(max_mapped_addr - 4096); 199 #endif 200 201 min_low_pfn = PFN_UP(memblock_start_of_DRAM()); 202 max_low_pfn = max_pfn = PFN_DOWN(dram_end); 203 204 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn)); 205 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET); 206 207 reserve_initrd_mem(); 208 /* 209 * If DTB is built in, no need to reserve its memblock. 210 * Otherwise, do reserve it but avoid using 211 * early_init_fdt_reserve_self() since __pa() does 212 * not work for DTB pointers that are fixmap addresses 213 */ 214 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) 215 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va)); 216 217 early_init_fdt_scan_reserved_mem(); 218 dma_contiguous_reserve(dma32_phys_limit); 219 memblock_allow_resize(); 220 } 221 222 #ifdef CONFIG_MMU 223 static struct pt_alloc_ops _pt_ops __initdata; 224 225 #ifdef CONFIG_XIP_KERNEL 226 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops)) 227 #else 228 #define pt_ops _pt_ops 229 #endif 230 231 unsigned long pfn_base __ro_after_init; 232 EXPORT_SYMBOL(pfn_base); 233 234 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 235 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss; 236 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss; 237 238 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE); 239 240 #ifdef CONFIG_XIP_KERNEL 241 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir)) 242 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte)) 243 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir)) 244 #endif /* CONFIG_XIP_KERNEL */ 245 246 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot) 247 { 248 unsigned long addr = __fix_to_virt(idx); 249 pte_t *ptep; 250 251 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses); 252 253 ptep = &fixmap_pte[pte_index(addr)]; 254 255 if (pgprot_val(prot)) 256 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot)); 257 else 258 pte_clear(&init_mm, addr, ptep); 259 local_flush_tlb_page(addr); 260 } 261 262 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa) 263 { 264 return (pte_t *)((uintptr_t)pa); 265 } 266 267 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa) 268 { 269 clear_fixmap(FIX_PTE); 270 return (pte_t *)set_fixmap_offset(FIX_PTE, pa); 271 } 272 273 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa) 274 { 275 return (pte_t *) __va(pa); 276 } 277 278 static inline phys_addr_t __init alloc_pte_early(uintptr_t va) 279 { 280 /* 281 * We only create PMD or PGD early mappings so we 282 * should never reach here with MMU disabled. 283 */ 284 BUG(); 285 } 286 287 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va) 288 { 289 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 290 } 291 292 static phys_addr_t __init alloc_pte_late(uintptr_t va) 293 { 294 unsigned long vaddr; 295 296 vaddr = __get_free_page(GFP_KERNEL); 297 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr))); 298 299 return __pa(vaddr); 300 } 301 302 static void __init create_pte_mapping(pte_t *ptep, 303 uintptr_t va, phys_addr_t pa, 304 phys_addr_t sz, pgprot_t prot) 305 { 306 uintptr_t pte_idx = pte_index(va); 307 308 BUG_ON(sz != PAGE_SIZE); 309 310 if (pte_none(ptep[pte_idx])) 311 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot); 312 } 313 314 #ifndef __PAGETABLE_PMD_FOLDED 315 316 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss; 317 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss; 318 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 319 static pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE); 320 321 #ifdef CONFIG_XIP_KERNEL 322 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd)) 323 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd)) 324 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd)) 325 #endif /* CONFIG_XIP_KERNEL */ 326 327 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa) 328 { 329 /* Before MMU is enabled */ 330 return (pmd_t *)((uintptr_t)pa); 331 } 332 333 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa) 334 { 335 clear_fixmap(FIX_PMD); 336 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa); 337 } 338 339 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa) 340 { 341 return (pmd_t *) __va(pa); 342 } 343 344 static phys_addr_t __init alloc_pmd_early(uintptr_t va) 345 { 346 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT); 347 348 return (uintptr_t)early_pmd; 349 } 350 351 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va) 352 { 353 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE); 354 } 355 356 static phys_addr_t __init alloc_pmd_late(uintptr_t va) 357 { 358 unsigned long vaddr; 359 360 vaddr = __get_free_page(GFP_KERNEL); 361 BUG_ON(!vaddr); 362 return __pa(vaddr); 363 } 364 365 static void __init create_pmd_mapping(pmd_t *pmdp, 366 uintptr_t va, phys_addr_t pa, 367 phys_addr_t sz, pgprot_t prot) 368 { 369 pte_t *ptep; 370 phys_addr_t pte_phys; 371 uintptr_t pmd_idx = pmd_index(va); 372 373 if (sz == PMD_SIZE) { 374 if (pmd_none(pmdp[pmd_idx])) 375 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot); 376 return; 377 } 378 379 if (pmd_none(pmdp[pmd_idx])) { 380 pte_phys = pt_ops.alloc_pte(va); 381 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE); 382 ptep = pt_ops.get_pte_virt(pte_phys); 383 memset(ptep, 0, PAGE_SIZE); 384 } else { 385 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx])); 386 ptep = pt_ops.get_pte_virt(pte_phys); 387 } 388 389 create_pte_mapping(ptep, va, pa, sz, prot); 390 } 391 392 #define pgd_next_t pmd_t 393 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va) 394 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa) 395 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 396 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot) 397 #define fixmap_pgd_next fixmap_pmd 398 #else 399 #define pgd_next_t pte_t 400 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va) 401 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa) 402 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \ 403 create_pte_mapping(__nextp, __va, __pa, __sz, __prot) 404 #define fixmap_pgd_next fixmap_pte 405 #endif 406 407 void __init create_pgd_mapping(pgd_t *pgdp, 408 uintptr_t va, phys_addr_t pa, 409 phys_addr_t sz, pgprot_t prot) 410 { 411 pgd_next_t *nextp; 412 phys_addr_t next_phys; 413 uintptr_t pgd_idx = pgd_index(va); 414 415 if (sz == PGDIR_SIZE) { 416 if (pgd_val(pgdp[pgd_idx]) == 0) 417 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot); 418 return; 419 } 420 421 if (pgd_val(pgdp[pgd_idx]) == 0) { 422 next_phys = alloc_pgd_next(va); 423 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE); 424 nextp = get_pgd_next_virt(next_phys); 425 memset(nextp, 0, PAGE_SIZE); 426 } else { 427 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx])); 428 nextp = get_pgd_next_virt(next_phys); 429 } 430 431 create_pgd_next_mapping(nextp, va, pa, sz, prot); 432 } 433 434 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size) 435 { 436 /* Upgrade to PMD_SIZE mappings whenever possible */ 437 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1))) 438 return PAGE_SIZE; 439 440 return PMD_SIZE; 441 } 442 443 #ifdef CONFIG_XIP_KERNEL 444 /* called from head.S with MMU off */ 445 asmlinkage void __init __copy_data(void) 446 { 447 void *from = (void *)(&_sdata); 448 void *end = (void *)(&_end); 449 void *to = (void *)CONFIG_PHYS_RAM_BASE; 450 size_t sz = (size_t)(end - from + 1); 451 452 memcpy(to, from, sz); 453 } 454 #endif 455 456 #ifdef CONFIG_STRICT_KERNEL_RWX 457 static __init pgprot_t pgprot_from_va(uintptr_t va) 458 { 459 if (is_va_kernel_text(va)) 460 return PAGE_KERNEL_READ_EXEC; 461 462 /* 463 * In 64-bit kernel, the kernel mapping is outside the linear mapping so 464 * we must protect its linear mapping alias from being executed and 465 * written. 466 * And rodata section is marked readonly in mark_rodata_ro. 467 */ 468 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va)) 469 return PAGE_KERNEL_READ; 470 471 return PAGE_KERNEL; 472 } 473 474 void mark_rodata_ro(void) 475 { 476 set_kernel_memory(__start_rodata, _data, set_memory_ro); 477 if (IS_ENABLED(CONFIG_64BIT)) 478 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data), 479 set_memory_ro); 480 481 debug_checkwx(); 482 } 483 #else 484 static __init pgprot_t pgprot_from_va(uintptr_t va) 485 { 486 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va)) 487 return PAGE_KERNEL; 488 489 return PAGE_KERNEL_EXEC; 490 } 491 #endif /* CONFIG_STRICT_KERNEL_RWX */ 492 493 /* 494 * setup_vm() is called from head.S with MMU-off. 495 * 496 * Following requirements should be honoured for setup_vm() to work 497 * correctly: 498 * 1) It should use PC-relative addressing for accessing kernel symbols. 499 * To achieve this we always use GCC cmodel=medany. 500 * 2) The compiler instrumentation for FTRACE will not work for setup_vm() 501 * so disable compiler instrumentation when FTRACE is enabled. 502 * 503 * Currently, the above requirements are honoured by using custom CFLAGS 504 * for init.o in mm/Makefile. 505 */ 506 507 #ifndef __riscv_cmodel_medany 508 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing." 509 #endif 510 511 #ifdef CONFIG_XIP_KERNEL 512 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size, 513 __always_unused bool early) 514 { 515 uintptr_t va, end_va; 516 517 /* Map the flash resident part */ 518 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz; 519 for (va = kernel_map.virt_addr; va < end_va; va += map_size) 520 create_pgd_mapping(pgdir, va, 521 kernel_map.xiprom + (va - kernel_map.virt_addr), 522 map_size, PAGE_KERNEL_EXEC); 523 524 /* Map the data in RAM */ 525 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size; 526 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += map_size) 527 create_pgd_mapping(pgdir, va, 528 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)), 529 map_size, PAGE_KERNEL); 530 } 531 #else 532 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size, 533 bool early) 534 { 535 uintptr_t va, end_va; 536 537 end_va = kernel_map.virt_addr + kernel_map.size; 538 for (va = kernel_map.virt_addr; va < end_va; va += map_size) 539 create_pgd_mapping(pgdir, va, 540 kernel_map.phys_addr + (va - kernel_map.virt_addr), 541 map_size, 542 early ? 543 PAGE_KERNEL_EXEC : pgprot_from_va(va)); 544 } 545 #endif 546 547 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 548 { 549 uintptr_t __maybe_unused pa; 550 uintptr_t map_size; 551 #ifndef __PAGETABLE_PMD_FOLDED 552 pmd_t fix_bmap_spmd, fix_bmap_epmd; 553 #endif 554 555 kernel_map.virt_addr = KERNEL_LINK_ADDR; 556 557 #ifdef CONFIG_XIP_KERNEL 558 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR; 559 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom); 560 561 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE; 562 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata); 563 564 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom; 565 #else 566 kernel_map.phys_addr = (uintptr_t)(&_start); 567 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr; 568 #endif 569 570 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr; 571 #ifdef CONFIG_64BIT 572 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr; 573 #endif 574 575 pfn_base = PFN_DOWN(kernel_map.phys_addr); 576 577 /* 578 * Enforce boot alignment requirements of RV32 and 579 * RV64 by only allowing PMD or PGD mappings. 580 */ 581 map_size = PMD_SIZE; 582 583 /* Sanity check alignment and size */ 584 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0); 585 BUG_ON((kernel_map.phys_addr % map_size) != 0); 586 587 #ifdef CONFIG_64BIT 588 /* 589 * The last 4K bytes of the addressable memory can not be mapped because 590 * of IS_ERR_VALUE macro. 591 */ 592 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K); 593 #endif 594 595 pt_ops.alloc_pte = alloc_pte_early; 596 pt_ops.get_pte_virt = get_pte_virt_early; 597 #ifndef __PAGETABLE_PMD_FOLDED 598 pt_ops.alloc_pmd = alloc_pmd_early; 599 pt_ops.get_pmd_virt = get_pmd_virt_early; 600 #endif 601 /* Setup early PGD for fixmap */ 602 create_pgd_mapping(early_pg_dir, FIXADDR_START, 603 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE); 604 605 #ifndef __PAGETABLE_PMD_FOLDED 606 /* Setup fixmap PMD */ 607 create_pmd_mapping(fixmap_pmd, FIXADDR_START, 608 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE); 609 /* Setup trampoline PGD and PMD */ 610 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 611 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE); 612 #ifdef CONFIG_XIP_KERNEL 613 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 614 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC); 615 #else 616 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr, 617 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC); 618 #endif 619 #else 620 /* Setup trampoline PGD */ 621 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr, 622 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC); 623 #endif 624 625 /* 626 * Setup early PGD covering entire kernel which will allow 627 * us to reach paging_init(). We map all memory banks later 628 * in setup_vm_final() below. 629 */ 630 create_kernel_page_table(early_pg_dir, map_size, true); 631 632 #ifndef __PAGETABLE_PMD_FOLDED 633 /* Setup early PMD for DTB */ 634 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 635 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE); 636 #ifndef CONFIG_BUILTIN_DTB 637 /* Create two consecutive PMD mappings for FDT early scan */ 638 pa = dtb_pa & ~(PMD_SIZE - 1); 639 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA, 640 pa, PMD_SIZE, PAGE_KERNEL); 641 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE, 642 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL); 643 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1)); 644 #else /* CONFIG_BUILTIN_DTB */ 645 #ifdef CONFIG_64BIT 646 /* 647 * __va can't be used since it would return a linear mapping address 648 * whereas dtb_early_va will be used before setup_vm_final installs 649 * the linear mapping. 650 */ 651 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa)); 652 #else 653 dtb_early_va = __va(dtb_pa); 654 #endif /* CONFIG_64BIT */ 655 #endif /* CONFIG_BUILTIN_DTB */ 656 #else 657 #ifndef CONFIG_BUILTIN_DTB 658 /* Create two consecutive PGD mappings for FDT early scan */ 659 pa = dtb_pa & ~(PGDIR_SIZE - 1); 660 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA, 661 pa, PGDIR_SIZE, PAGE_KERNEL); 662 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE, 663 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL); 664 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1)); 665 #else /* CONFIG_BUILTIN_DTB */ 666 #ifdef CONFIG_64BIT 667 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa)); 668 #else 669 dtb_early_va = __va(dtb_pa); 670 #endif /* CONFIG_64BIT */ 671 #endif /* CONFIG_BUILTIN_DTB */ 672 #endif 673 dtb_early_pa = dtb_pa; 674 675 /* 676 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap 677 * range can not span multiple pmds. 678 */ 679 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) 680 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); 681 682 #ifndef __PAGETABLE_PMD_FOLDED 683 /* 684 * Early ioremap fixmap is already created as it lies within first 2MB 685 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END 686 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn 687 * the user if not. 688 */ 689 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))]; 690 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))]; 691 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) { 692 WARN_ON(1); 693 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n", 694 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd)); 695 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", 696 fix_to_virt(FIX_BTMAP_BEGIN)); 697 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", 698 fix_to_virt(FIX_BTMAP_END)); 699 700 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); 701 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); 702 } 703 #endif 704 } 705 706 static void __init setup_vm_final(void) 707 { 708 uintptr_t va, map_size; 709 phys_addr_t pa, start, end; 710 u64 i; 711 712 /** 713 * MMU is enabled at this point. But page table setup is not complete yet. 714 * fixmap page table alloc functions should be used at this point 715 */ 716 pt_ops.alloc_pte = alloc_pte_fixmap; 717 pt_ops.get_pte_virt = get_pte_virt_fixmap; 718 #ifndef __PAGETABLE_PMD_FOLDED 719 pt_ops.alloc_pmd = alloc_pmd_fixmap; 720 pt_ops.get_pmd_virt = get_pmd_virt_fixmap; 721 #endif 722 /* Setup swapper PGD for fixmap */ 723 create_pgd_mapping(swapper_pg_dir, FIXADDR_START, 724 __pa_symbol(fixmap_pgd_next), 725 PGDIR_SIZE, PAGE_TABLE); 726 727 /* Map all memory banks in the linear mapping */ 728 for_each_mem_range(i, &start, &end) { 729 if (start >= end) 730 break; 731 if (start <= __pa(PAGE_OFFSET) && 732 __pa(PAGE_OFFSET) < end) 733 start = __pa(PAGE_OFFSET); 734 if (end >= __pa(PAGE_OFFSET) + memory_limit) 735 end = __pa(PAGE_OFFSET) + memory_limit; 736 737 map_size = best_map_size(start, end - start); 738 for (pa = start; pa < end; pa += map_size) { 739 va = (uintptr_t)__va(pa); 740 741 create_pgd_mapping(swapper_pg_dir, va, pa, map_size, 742 pgprot_from_va(va)); 743 } 744 } 745 746 #ifdef CONFIG_64BIT 747 /* Map the kernel */ 748 create_kernel_page_table(swapper_pg_dir, PMD_SIZE, false); 749 #endif 750 751 /* Clear fixmap PTE and PMD mappings */ 752 clear_fixmap(FIX_PTE); 753 clear_fixmap(FIX_PMD); 754 755 /* Move to swapper page table */ 756 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE); 757 local_flush_tlb_all(); 758 759 /* generic page allocation functions must be used to setup page table */ 760 pt_ops.alloc_pte = alloc_pte_late; 761 pt_ops.get_pte_virt = get_pte_virt_late; 762 #ifndef __PAGETABLE_PMD_FOLDED 763 pt_ops.alloc_pmd = alloc_pmd_late; 764 pt_ops.get_pmd_virt = get_pmd_virt_late; 765 #endif 766 } 767 #else 768 asmlinkage void __init setup_vm(uintptr_t dtb_pa) 769 { 770 dtb_early_va = (void *)dtb_pa; 771 dtb_early_pa = dtb_pa; 772 } 773 774 static inline void setup_vm_final(void) 775 { 776 } 777 #endif /* CONFIG_MMU */ 778 779 #ifdef CONFIG_KEXEC_CORE 780 /* 781 * reserve_crashkernel() - reserves memory for crash kernel 782 * 783 * This function reserves memory area given in "crashkernel=" kernel command 784 * line parameter. The memory reserved is used by dump capture kernel when 785 * primary kernel is crashing. 786 */ 787 static void __init reserve_crashkernel(void) 788 { 789 unsigned long long crash_base = 0; 790 unsigned long long crash_size = 0; 791 unsigned long search_start = memblock_start_of_DRAM(); 792 unsigned long search_end = memblock_end_of_DRAM(); 793 794 int ret = 0; 795 796 /* 797 * Don't reserve a region for a crash kernel on a crash kernel 798 * since it doesn't make much sense and we have limited memory 799 * resources. 800 */ 801 #ifdef CONFIG_CRASH_DUMP 802 if (is_kdump_kernel()) { 803 pr_info("crashkernel: ignoring reservation request\n"); 804 return; 805 } 806 #endif 807 808 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(), 809 &crash_size, &crash_base); 810 if (ret || !crash_size) 811 return; 812 813 crash_size = PAGE_ALIGN(crash_size); 814 815 if (crash_base == 0) { 816 /* 817 * Current riscv boot protocol requires 2MB alignment for 818 * RV64 and 4MB alignment for RV32 (hugepage size) 819 */ 820 crash_base = memblock_find_in_range(search_start, search_end, 821 crash_size, PMD_SIZE); 822 823 if (crash_base == 0) { 824 pr_warn("crashkernel: couldn't allocate %lldKB\n", 825 crash_size >> 10); 826 return; 827 } 828 } else { 829 /* User specifies base address explicitly. */ 830 if (!memblock_is_region_memory(crash_base, crash_size)) { 831 pr_warn("crashkernel: requested region is not memory\n"); 832 return; 833 } 834 835 if (memblock_is_region_reserved(crash_base, crash_size)) { 836 pr_warn("crashkernel: requested region is reserved\n"); 837 return; 838 } 839 840 841 if (!IS_ALIGNED(crash_base, PMD_SIZE)) { 842 pr_warn("crashkernel: requested region is misaligned\n"); 843 return; 844 } 845 } 846 memblock_reserve(crash_base, crash_size); 847 848 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n", 849 crash_base, crash_base + crash_size, crash_size >> 20); 850 851 crashk_res.start = crash_base; 852 crashk_res.end = crash_base + crash_size - 1; 853 } 854 #endif /* CONFIG_KEXEC_CORE */ 855 856 #ifdef CONFIG_CRASH_DUMP 857 /* 858 * We keep track of the ELF core header of the crashed 859 * kernel with a reserved-memory region with compatible 860 * string "linux,elfcorehdr". Here we register a callback 861 * to populate elfcorehdr_addr/size when this region is 862 * present. Note that this region will be marked as 863 * reserved once we call early_init_fdt_scan_reserved_mem() 864 * later on. 865 */ 866 static int __init elfcore_hdr_setup(struct reserved_mem *rmem) 867 { 868 elfcorehdr_addr = rmem->base; 869 elfcorehdr_size = rmem->size; 870 return 0; 871 } 872 873 RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup); 874 #endif 875 876 void __init paging_init(void) 877 { 878 setup_bootmem(); 879 setup_vm_final(); 880 } 881 882 void __init misc_mem_init(void) 883 { 884 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 885 arch_numa_init(); 886 sparse_init(); 887 zone_sizes_init(); 888 #ifdef CONFIG_KEXEC_CORE 889 reserve_crashkernel(); 890 #endif 891 memblock_dump_all(); 892 } 893 894 #ifdef CONFIG_SPARSEMEM_VMEMMAP 895 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node, 896 struct vmem_altmap *altmap) 897 { 898 return vmemmap_populate_basepages(start, end, node, NULL); 899 } 900 #endif 901