1 // SPDX-License-Identifier: GPL-2.0-only
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>
9 #include <linux/init.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>
23 #include <asm/fixmap.h>
24 #include <asm/tlbflush.h>
25 #include <asm/sections.h>
28 #include <asm/ptdump.h>
31 #include "../kernel/head.h"
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))
39 #ifdef CONFIG_XIP_KERNEL
40 extern char _xiprom[], _exiprom[];
43 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
45 EXPORT_SYMBOL(empty_zero_page);
48 #define DTB_EARLY_BASE_VA PGDIR_SIZE
49 void *_dtb_early_va __initdata;
50 uintptr_t _dtb_early_pa __initdata;
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);
61 static phys_addr_t dma32_phys_limit __initdata;
63 static void __init zone_sizes_init(void)
65 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
67 #ifdef CONFIG_ZONE_DMA32
68 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
70 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
72 free_area_init(max_zone_pfns);
75 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
76 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
78 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
82 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
84 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
88 static void __init print_vm_layout(void)
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);
102 print_mlm("kernel", (unsigned long)KERNEL_LINK_ADDR,
103 (unsigned long)ADDRESS_SPACE_END);
107 static void print_vm_layout(void) { }
108 #endif /* CONFIG_DEBUG_VM */
110 void __init mem_init(void)
112 #ifdef CONFIG_FLATMEM
114 #endif /* CONFIG_FLATMEM */
116 #ifdef CONFIG_SWIOTLB
117 if (swiotlb_force == SWIOTLB_FORCE ||
118 max_pfn > PFN_DOWN(dma32_phys_limit))
121 swiotlb_force = SWIOTLB_NO_FORCE;
123 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
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
134 * Limit the memory size via mem.
137 static phys_addr_t memory_limit = -PAGE_OFFSET - SZ_4G;
139 static phys_addr_t memory_limit = -PAGE_OFFSET;
142 static int __init early_mem(char *p)
149 size = memparse(p, &p) & PAGE_MASK;
150 memory_limit = min_t(u64, size, memory_limit);
152 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
156 early_param("mem", early_mem);
158 static void __init setup_bootmem(void)
160 phys_addr_t vmlinux_end = __pa_symbol(&_end);
161 phys_addr_t vmlinux_start = __pa_symbol(&_start);
162 phys_addr_t max_mapped_addr = __pa(~(ulong)0);
163 phys_addr_t dram_end;
165 #ifdef CONFIG_XIP_KERNEL
166 vmlinux_start = __pa_symbol(&_sdata);
169 memblock_enforce_memory_limit(memory_limit);
172 * Reserve from the start of the kernel to the end of the kernel
174 #if defined(CONFIG_64BIT) && defined(CONFIG_STRICT_KERNEL_RWX)
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.
180 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
182 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
184 dram_end = memblock_end_of_DRAM();
187 * memblock allocator is not aware of the fact that last 4K bytes of
188 * the addressable memory can not be mapped because of IS_ERR_VALUE
189 * macro. Make sure that last 4k bytes are not usable by memblock
190 * if end of dram is equal to maximum addressable memory.
192 if (max_mapped_addr == (dram_end - 1))
193 memblock_set_current_limit(max_mapped_addr - 4096);
195 min_low_pfn = PFN_UP(memblock_start_of_DRAM());
196 max_low_pfn = max_pfn = PFN_DOWN(dram_end);
198 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
199 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
201 reserve_initrd_mem();
203 * If DTB is built in, no need to reserve its memblock.
204 * Otherwise, do reserve it but avoid using
205 * early_init_fdt_reserve_self() since __pa() does
206 * not work for DTB pointers that are fixmap addresses
208 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
209 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
211 early_init_fdt_scan_reserved_mem();
212 dma_contiguous_reserve(dma32_phys_limit);
213 memblock_allow_resize();
217 static struct pt_alloc_ops _pt_ops __initdata;
219 #ifdef CONFIG_XIP_KERNEL
220 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&_pt_ops))
222 #define pt_ops _pt_ops
225 unsigned long pfn_base __ro_after_init;
226 EXPORT_SYMBOL(pfn_base);
228 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
229 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
230 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
232 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
234 #ifdef CONFIG_XIP_KERNEL
235 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
236 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
237 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
238 #endif /* CONFIG_XIP_KERNEL */
240 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
242 unsigned long addr = __fix_to_virt(idx);
245 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
247 ptep = &fixmap_pte[pte_index(addr)];
249 if (pgprot_val(prot))
250 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
252 pte_clear(&init_mm, addr, ptep);
253 local_flush_tlb_page(addr);
256 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
258 return (pte_t *)((uintptr_t)pa);
261 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
263 clear_fixmap(FIX_PTE);
264 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
267 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
269 return (pte_t *) __va(pa);
272 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
275 * We only create PMD or PGD early mappings so we
276 * should never reach here with MMU disabled.
281 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
283 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
286 static phys_addr_t __init alloc_pte_late(uintptr_t va)
290 vaddr = __get_free_page(GFP_KERNEL);
291 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
296 static void __init create_pte_mapping(pte_t *ptep,
297 uintptr_t va, phys_addr_t pa,
298 phys_addr_t sz, pgprot_t prot)
300 uintptr_t pte_idx = pte_index(va);
302 BUG_ON(sz != PAGE_SIZE);
304 if (pte_none(ptep[pte_idx]))
305 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
308 #ifndef __PAGETABLE_PMD_FOLDED
310 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
311 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
312 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
313 static pmd_t early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
315 #ifdef CONFIG_XIP_KERNEL
316 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
317 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
318 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
319 #endif /* CONFIG_XIP_KERNEL */
321 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
323 /* Before MMU is enabled */
324 return (pmd_t *)((uintptr_t)pa);
327 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
329 clear_fixmap(FIX_PMD);
330 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
333 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
335 return (pmd_t *) __va(pa);
338 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
340 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
342 return (uintptr_t)early_pmd;
345 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
347 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
350 static phys_addr_t __init alloc_pmd_late(uintptr_t va)
354 vaddr = __get_free_page(GFP_KERNEL);
359 static void __init create_pmd_mapping(pmd_t *pmdp,
360 uintptr_t va, phys_addr_t pa,
361 phys_addr_t sz, pgprot_t prot)
364 phys_addr_t pte_phys;
365 uintptr_t pmd_idx = pmd_index(va);
367 if (sz == PMD_SIZE) {
368 if (pmd_none(pmdp[pmd_idx]))
369 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
373 if (pmd_none(pmdp[pmd_idx])) {
374 pte_phys = pt_ops.alloc_pte(va);
375 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
376 ptep = pt_ops.get_pte_virt(pte_phys);
377 memset(ptep, 0, PAGE_SIZE);
379 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
380 ptep = pt_ops.get_pte_virt(pte_phys);
383 create_pte_mapping(ptep, va, pa, sz, prot);
386 #define pgd_next_t pmd_t
387 #define alloc_pgd_next(__va) pt_ops.alloc_pmd(__va)
388 #define get_pgd_next_virt(__pa) pt_ops.get_pmd_virt(__pa)
389 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
390 create_pmd_mapping(__nextp, __va, __pa, __sz, __prot)
391 #define fixmap_pgd_next fixmap_pmd
393 #define pgd_next_t pte_t
394 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
395 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
396 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
397 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
398 #define fixmap_pgd_next fixmap_pte
401 void __init create_pgd_mapping(pgd_t *pgdp,
402 uintptr_t va, phys_addr_t pa,
403 phys_addr_t sz, pgprot_t prot)
406 phys_addr_t next_phys;
407 uintptr_t pgd_idx = pgd_index(va);
409 if (sz == PGDIR_SIZE) {
410 if (pgd_val(pgdp[pgd_idx]) == 0)
411 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
415 if (pgd_val(pgdp[pgd_idx]) == 0) {
416 next_phys = alloc_pgd_next(va);
417 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
418 nextp = get_pgd_next_virt(next_phys);
419 memset(nextp, 0, PAGE_SIZE);
421 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
422 nextp = get_pgd_next_virt(next_phys);
425 create_pgd_next_mapping(nextp, va, pa, sz, prot);
428 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
430 /* Upgrade to PMD_SIZE mappings whenever possible */
431 if ((base & (PMD_SIZE - 1)) || (size & (PMD_SIZE - 1)))
437 #ifdef CONFIG_XIP_KERNEL
438 /* called from head.S with MMU off */
439 asmlinkage void __init __copy_data(void)
441 void *from = (void *)(&_sdata);
442 void *end = (void *)(&_end);
443 void *to = (void *)CONFIG_PHYS_RAM_BASE;
444 size_t sz = (size_t)(end - from + 1);
446 memcpy(to, from, sz);
450 #ifdef CONFIG_STRICT_KERNEL_RWX
451 static __init pgprot_t pgprot_from_va(uintptr_t va)
453 if (is_va_kernel_text(va))
454 return PAGE_KERNEL_READ_EXEC;
457 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
458 * we must protect its linear mapping alias from being executed and
460 * And rodata section is marked readonly in mark_rodata_ro.
462 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
463 return PAGE_KERNEL_READ;
468 void mark_rodata_ro(void)
470 set_kernel_memory(__start_rodata, _data, set_memory_ro);
471 if (IS_ENABLED(CONFIG_64BIT))
472 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
478 static __init pgprot_t pgprot_from_va(uintptr_t va)
480 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
483 return PAGE_KERNEL_EXEC;
485 #endif /* CONFIG_STRICT_KERNEL_RWX */
488 * setup_vm() is called from head.S with MMU-off.
490 * Following requirements should be honoured for setup_vm() to work
492 * 1) It should use PC-relative addressing for accessing kernel symbols.
493 * To achieve this we always use GCC cmodel=medany.
494 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
495 * so disable compiler instrumentation when FTRACE is enabled.
497 * Currently, the above requirements are honoured by using custom CFLAGS
498 * for init.o in mm/Makefile.
501 #ifndef __riscv_cmodel_medany
502 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
505 #ifdef CONFIG_XIP_KERNEL
506 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size,
507 __always_unused bool early)
509 uintptr_t va, end_va;
511 /* Map the flash resident part */
512 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
513 for (va = kernel_map.virt_addr; va < end_va; va += map_size)
514 create_pgd_mapping(pgdir, va,
515 kernel_map.xiprom + (va - kernel_map.virt_addr),
516 map_size, PAGE_KERNEL_EXEC);
518 /* Map the data in RAM */
519 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size;
520 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += map_size)
521 create_pgd_mapping(pgdir, va,
522 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)),
523 map_size, PAGE_KERNEL);
526 static void __init create_kernel_page_table(pgd_t *pgdir, uintptr_t map_size,
529 uintptr_t va, end_va;
531 end_va = kernel_map.virt_addr + kernel_map.size;
532 for (va = kernel_map.virt_addr; va < end_va; va += map_size)
533 create_pgd_mapping(pgdir, va,
534 kernel_map.phys_addr + (va - kernel_map.virt_addr),
537 PAGE_KERNEL_EXEC : pgprot_from_va(va));
541 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
543 uintptr_t __maybe_unused pa;
545 #ifndef __PAGETABLE_PMD_FOLDED
546 pmd_t fix_bmap_spmd, fix_bmap_epmd;
549 kernel_map.virt_addr = KERNEL_LINK_ADDR;
551 #ifdef CONFIG_XIP_KERNEL
552 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
553 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
555 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
556 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
558 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
560 kernel_map.phys_addr = (uintptr_t)(&_start);
561 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
564 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr;
566 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
569 pfn_base = PFN_DOWN(kernel_map.phys_addr);
572 * Enforce boot alignment requirements of RV32 and
573 * RV64 by only allowing PMD or PGD mappings.
577 /* Sanity check alignment and size */
578 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
579 BUG_ON((kernel_map.phys_addr % map_size) != 0);
581 pt_ops.alloc_pte = alloc_pte_early;
582 pt_ops.get_pte_virt = get_pte_virt_early;
583 #ifndef __PAGETABLE_PMD_FOLDED
584 pt_ops.alloc_pmd = alloc_pmd_early;
585 pt_ops.get_pmd_virt = get_pmd_virt_early;
587 /* Setup early PGD for fixmap */
588 create_pgd_mapping(early_pg_dir, FIXADDR_START,
589 (uintptr_t)fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
591 #ifndef __PAGETABLE_PMD_FOLDED
592 /* Setup fixmap PMD */
593 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
594 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
595 /* Setup trampoline PGD and PMD */
596 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
597 (uintptr_t)trampoline_pmd, PGDIR_SIZE, PAGE_TABLE);
598 #ifdef CONFIG_XIP_KERNEL
599 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
600 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
602 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
603 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
606 /* Setup trampoline PGD */
607 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
608 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
612 * Setup early PGD covering entire kernel which will allow
613 * us to reach paging_init(). We map all memory banks later
614 * in setup_vm_final() below.
616 create_kernel_page_table(early_pg_dir, map_size, true);
618 #ifndef __PAGETABLE_PMD_FOLDED
619 /* Setup early PMD for DTB */
620 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
621 (uintptr_t)early_dtb_pmd, PGDIR_SIZE, PAGE_TABLE);
622 #ifndef CONFIG_BUILTIN_DTB
623 /* Create two consecutive PMD mappings for FDT early scan */
624 pa = dtb_pa & ~(PMD_SIZE - 1);
625 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
626 pa, PMD_SIZE, PAGE_KERNEL);
627 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
628 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
629 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
630 #else /* CONFIG_BUILTIN_DTB */
633 * __va can't be used since it would return a linear mapping address
634 * whereas dtb_early_va will be used before setup_vm_final installs
635 * the linear mapping.
637 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
639 dtb_early_va = __va(dtb_pa);
640 #endif /* CONFIG_64BIT */
641 #endif /* CONFIG_BUILTIN_DTB */
643 #ifndef CONFIG_BUILTIN_DTB
644 /* Create two consecutive PGD mappings for FDT early scan */
645 pa = dtb_pa & ~(PGDIR_SIZE - 1);
646 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
647 pa, PGDIR_SIZE, PAGE_KERNEL);
648 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA + PGDIR_SIZE,
649 pa + PGDIR_SIZE, PGDIR_SIZE, PAGE_KERNEL);
650 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PGDIR_SIZE - 1));
651 #else /* CONFIG_BUILTIN_DTB */
653 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
655 dtb_early_va = __va(dtb_pa);
656 #endif /* CONFIG_64BIT */
657 #endif /* CONFIG_BUILTIN_DTB */
659 dtb_early_pa = dtb_pa;
662 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
663 * range can not span multiple pmds.
665 BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
666 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
668 #ifndef __PAGETABLE_PMD_FOLDED
670 * Early ioremap fixmap is already created as it lies within first 2MB
671 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
672 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
675 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
676 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
677 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
679 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
680 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
681 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
682 fix_to_virt(FIX_BTMAP_BEGIN));
683 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
684 fix_to_virt(FIX_BTMAP_END));
686 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
687 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
692 static void __init setup_vm_final(void)
694 uintptr_t va, map_size;
695 phys_addr_t pa, start, end;
699 * MMU is enabled at this point. But page table setup is not complete yet.
700 * fixmap page table alloc functions should be used at this point
702 pt_ops.alloc_pte = alloc_pte_fixmap;
703 pt_ops.get_pte_virt = get_pte_virt_fixmap;
704 #ifndef __PAGETABLE_PMD_FOLDED
705 pt_ops.alloc_pmd = alloc_pmd_fixmap;
706 pt_ops.get_pmd_virt = get_pmd_virt_fixmap;
708 /* Setup swapper PGD for fixmap */
709 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
710 __pa_symbol(fixmap_pgd_next),
711 PGDIR_SIZE, PAGE_TABLE);
713 /* Map all memory banks in the linear mapping */
714 for_each_mem_range(i, &start, &end) {
717 if (start <= __pa(PAGE_OFFSET) &&
718 __pa(PAGE_OFFSET) < end)
719 start = __pa(PAGE_OFFSET);
721 map_size = best_map_size(start, end - start);
722 for (pa = start; pa < end; pa += map_size) {
723 va = (uintptr_t)__va(pa);
725 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
732 create_kernel_page_table(swapper_pg_dir, PMD_SIZE, false);
735 /* Clear fixmap PTE and PMD mappings */
736 clear_fixmap(FIX_PTE);
737 clear_fixmap(FIX_PMD);
739 /* Move to swapper page table */
740 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | SATP_MODE);
741 local_flush_tlb_all();
743 /* generic page allocation functions must be used to setup page table */
744 pt_ops.alloc_pte = alloc_pte_late;
745 pt_ops.get_pte_virt = get_pte_virt_late;
746 #ifndef __PAGETABLE_PMD_FOLDED
747 pt_ops.alloc_pmd = alloc_pmd_late;
748 pt_ops.get_pmd_virt = get_pmd_virt_late;
752 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
754 dtb_early_va = (void *)dtb_pa;
755 dtb_early_pa = dtb_pa;
758 static inline void setup_vm_final(void)
761 #endif /* CONFIG_MMU */
763 #ifdef CONFIG_KEXEC_CORE
765 * reserve_crashkernel() - reserves memory for crash kernel
767 * This function reserves memory area given in "crashkernel=" kernel command
768 * line parameter. The memory reserved is used by dump capture kernel when
769 * primary kernel is crashing.
771 static void __init reserve_crashkernel(void)
773 unsigned long long crash_base = 0;
774 unsigned long long crash_size = 0;
775 unsigned long search_start = memblock_start_of_DRAM();
776 unsigned long search_end = memblock_end_of_DRAM();
781 * Don't reserve a region for a crash kernel on a crash kernel
782 * since it doesn't make much sense and we have limited memory
785 #ifdef CONFIG_CRASH_DUMP
786 if (is_kdump_kernel()) {
787 pr_info("crashkernel: ignoring reservation request\n");
792 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
793 &crash_size, &crash_base);
794 if (ret || !crash_size)
797 crash_size = PAGE_ALIGN(crash_size);
799 if (crash_base == 0) {
801 * Current riscv boot protocol requires 2MB alignment for
802 * RV64 and 4MB alignment for RV32 (hugepage size)
804 crash_base = memblock_find_in_range(search_start, search_end,
805 crash_size, PMD_SIZE);
807 if (crash_base == 0) {
808 pr_warn("crashkernel: couldn't allocate %lldKB\n",
813 /* User specifies base address explicitly. */
814 if (!memblock_is_region_memory(crash_base, crash_size)) {
815 pr_warn("crashkernel: requested region is not memory\n");
819 if (memblock_is_region_reserved(crash_base, crash_size)) {
820 pr_warn("crashkernel: requested region is reserved\n");
825 if (!IS_ALIGNED(crash_base, PMD_SIZE)) {
826 pr_warn("crashkernel: requested region is misaligned\n");
830 memblock_reserve(crash_base, crash_size);
832 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
833 crash_base, crash_base + crash_size, crash_size >> 20);
835 crashk_res.start = crash_base;
836 crashk_res.end = crash_base + crash_size - 1;
838 #endif /* CONFIG_KEXEC_CORE */
840 #ifdef CONFIG_CRASH_DUMP
842 * We keep track of the ELF core header of the crashed
843 * kernel with a reserved-memory region with compatible
844 * string "linux,elfcorehdr". Here we register a callback
845 * to populate elfcorehdr_addr/size when this region is
846 * present. Note that this region will be marked as
847 * reserved once we call early_init_fdt_scan_reserved_mem()
850 static int __init elfcore_hdr_setup(struct reserved_mem *rmem)
852 elfcorehdr_addr = rmem->base;
853 elfcorehdr_size = rmem->size;
857 RESERVEDMEM_OF_DECLARE(elfcorehdr, "linux,elfcorehdr", elfcore_hdr_setup);
860 void __init paging_init(void)
866 void __init misc_mem_init(void)
868 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
872 #ifdef CONFIG_KEXEC_CORE
873 reserve_crashkernel();
878 #ifdef CONFIG_SPARSEMEM_VMEMMAP
879 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
880 struct vmem_altmap *altmap)
882 return vmemmap_populate_basepages(start, end, node, NULL);