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