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>
22 #include <linux/hugetlb.h>
24 #include <asm/fixmap.h>
25 #include <asm/tlbflush.h>
26 #include <asm/sections.h>
29 #include <asm/ptdump.h>
32 #include "../kernel/head.h"
34 struct kernel_mapping kernel_map __ro_after_init;
35 EXPORT_SYMBOL(kernel_map);
36 #ifdef CONFIG_XIP_KERNEL
37 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map))
41 u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39;
43 u64 satp_mode __ro_after_init = SATP_MODE_32;
45 EXPORT_SYMBOL(satp_mode);
47 bool pgtable_l4_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
48 bool pgtable_l5_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
49 EXPORT_SYMBOL(pgtable_l4_enabled);
50 EXPORT_SYMBOL(pgtable_l5_enabled);
52 phys_addr_t phys_ram_base __ro_after_init;
53 EXPORT_SYMBOL(phys_ram_base);
55 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
57 EXPORT_SYMBOL(empty_zero_page);
60 #define DTB_EARLY_BASE_VA PGDIR_SIZE
61 void *_dtb_early_va __initdata;
62 uintptr_t _dtb_early_pa __initdata;
64 static phys_addr_t dma32_phys_limit __initdata;
66 static void __init zone_sizes_init(void)
68 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
70 #ifdef CONFIG_ZONE_DMA32
71 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
73 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
75 free_area_init(max_zone_pfns);
78 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
80 #define LOG2_SZ_1K ilog2(SZ_1K)
81 #define LOG2_SZ_1M ilog2(SZ_1M)
82 #define LOG2_SZ_1G ilog2(SZ_1G)
83 #define LOG2_SZ_1T ilog2(SZ_1T)
85 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
87 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
88 (((t) - (b)) >> LOG2_SZ_1K));
91 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
93 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
94 (((t) - (b)) >> LOG2_SZ_1M));
97 static inline void print_mlg(char *name, unsigned long b, unsigned long t)
99 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t,
100 (((t) - (b)) >> LOG2_SZ_1G));
104 static inline void print_mlt(char *name, unsigned long b, unsigned long t)
106 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t,
107 (((t) - (b)) >> LOG2_SZ_1T));
110 #define print_mlt(n, b, t) do {} while (0)
113 static inline void print_ml(char *name, unsigned long b, unsigned long t)
115 unsigned long diff = t - b;
117 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10)
118 print_mlt(name, b, t);
119 else if ((diff >> LOG2_SZ_1G) >= 10)
120 print_mlg(name, b, t);
121 else if ((diff >> LOG2_SZ_1M) >= 10)
122 print_mlm(name, b, t);
124 print_mlk(name, b, t);
127 static void __init print_vm_layout(void)
129 pr_notice("Virtual kernel memory layout:\n");
130 print_ml("fixmap", (unsigned long)FIXADDR_START,
131 (unsigned long)FIXADDR_TOP);
132 print_ml("pci io", (unsigned long)PCI_IO_START,
133 (unsigned long)PCI_IO_END);
134 print_ml("vmemmap", (unsigned long)VMEMMAP_START,
135 (unsigned long)VMEMMAP_END);
136 print_ml("vmalloc", (unsigned long)VMALLOC_START,
137 (unsigned long)VMALLOC_END);
139 print_ml("modules", (unsigned long)MODULES_VADDR,
140 (unsigned long)MODULES_END);
142 print_ml("lowmem", (unsigned long)PAGE_OFFSET,
143 (unsigned long)high_memory);
144 if (IS_ENABLED(CONFIG_64BIT)) {
146 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END);
149 print_ml("kernel", (unsigned long)KERNEL_LINK_ADDR,
150 (unsigned long)ADDRESS_SPACE_END);
154 static void print_vm_layout(void) { }
155 #endif /* CONFIG_DEBUG_VM */
157 void __init mem_init(void)
159 #ifdef CONFIG_FLATMEM
161 #endif /* CONFIG_FLATMEM */
163 swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE);
169 /* Limit the memory size via mem. */
170 static phys_addr_t memory_limit;
172 static int __init early_mem(char *p)
179 size = memparse(p, &p) & PAGE_MASK;
180 memory_limit = min_t(u64, size, memory_limit);
182 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
186 early_param("mem", early_mem);
188 static void __init setup_bootmem(void)
190 phys_addr_t vmlinux_end = __pa_symbol(&_end);
191 phys_addr_t max_mapped_addr;
192 phys_addr_t phys_ram_end, vmlinux_start;
194 if (IS_ENABLED(CONFIG_XIP_KERNEL))
195 vmlinux_start = __pa_symbol(&_sdata);
197 vmlinux_start = __pa_symbol(&_start);
199 memblock_enforce_memory_limit(memory_limit);
202 * Make sure we align the reservation on PMD_SIZE since we will
203 * map the kernel in the linear mapping as read-only: we do not want
204 * any allocation to happen between _end and the next pmd aligned page.
206 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
207 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
209 * Reserve from the start of the kernel to the end of the kernel
211 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
213 phys_ram_end = memblock_end_of_DRAM();
214 if (!IS_ENABLED(CONFIG_XIP_KERNEL))
215 phys_ram_base = memblock_start_of_DRAM();
217 * memblock allocator is not aware of the fact that last 4K bytes of
218 * the addressable memory can not be mapped because of IS_ERR_VALUE
219 * macro. Make sure that last 4k bytes are not usable by memblock
220 * if end of dram is equal to maximum addressable memory. For 64-bit
221 * kernel, this problem can't happen here as the end of the virtual
222 * address space is occupied by the kernel mapping then this check must
223 * be done as soon as the kernel mapping base address is determined.
225 if (!IS_ENABLED(CONFIG_64BIT)) {
226 max_mapped_addr = __pa(~(ulong)0);
227 if (max_mapped_addr == (phys_ram_end - 1))
228 memblock_set_current_limit(max_mapped_addr - 4096);
231 min_low_pfn = PFN_UP(phys_ram_base);
232 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
233 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
235 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
236 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
238 reserve_initrd_mem();
240 * If DTB is built in, no need to reserve its memblock.
241 * Otherwise, do reserve it but avoid using
242 * early_init_fdt_reserve_self() since __pa() does
243 * not work for DTB pointers that are fixmap addresses
245 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) {
247 * In case the DTB is not located in a memory region we won't
248 * be able to locate it later on via the linear mapping and
249 * get a segfault when accessing it via __va(dtb_early_pa).
250 * To avoid this situation copy DTB to a memory region.
251 * Note that memblock_phys_alloc will also reserve DTB region.
253 if (!memblock_is_memory(dtb_early_pa)) {
254 size_t fdt_size = fdt_totalsize(dtb_early_va);
255 phys_addr_t new_dtb_early_pa = memblock_phys_alloc(fdt_size, PAGE_SIZE);
256 void *new_dtb_early_va = early_memremap(new_dtb_early_pa, fdt_size);
258 memcpy(new_dtb_early_va, dtb_early_va, fdt_size);
259 early_memunmap(new_dtb_early_va, fdt_size);
260 _dtb_early_pa = new_dtb_early_pa;
262 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
265 dma_contiguous_reserve(dma32_phys_limit);
266 if (IS_ENABLED(CONFIG_64BIT))
267 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
268 memblock_allow_resize();
272 struct pt_alloc_ops pt_ops __initdata;
274 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
275 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
276 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
278 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
279 static p4d_t __maybe_unused early_dtb_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE);
280 static pud_t __maybe_unused early_dtb_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
281 static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
283 #ifdef CONFIG_XIP_KERNEL
284 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
285 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
286 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
287 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
288 #endif /* CONFIG_XIP_KERNEL */
290 static const pgprot_t protection_map[16] = {
291 [VM_NONE] = PAGE_NONE,
292 [VM_READ] = PAGE_READ,
293 [VM_WRITE] = PAGE_COPY,
294 [VM_WRITE | VM_READ] = PAGE_COPY,
295 [VM_EXEC] = PAGE_EXEC,
296 [VM_EXEC | VM_READ] = PAGE_READ_EXEC,
297 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
298 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_READ_EXEC,
299 [VM_SHARED] = PAGE_NONE,
300 [VM_SHARED | VM_READ] = PAGE_READ,
301 [VM_SHARED | VM_WRITE] = PAGE_SHARED,
302 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
303 [VM_SHARED | VM_EXEC] = PAGE_EXEC,
304 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC,
305 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC,
306 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC
308 DECLARE_VM_GET_PAGE_PROT
310 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
312 unsigned long addr = __fix_to_virt(idx);
315 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
317 ptep = &fixmap_pte[pte_index(addr)];
319 if (pgprot_val(prot))
320 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
322 pte_clear(&init_mm, addr, ptep);
323 local_flush_tlb_page(addr);
326 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
328 return (pte_t *)((uintptr_t)pa);
331 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
333 clear_fixmap(FIX_PTE);
334 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
337 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
339 return (pte_t *) __va(pa);
342 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
345 * We only create PMD or PGD early mappings so we
346 * should never reach here with MMU disabled.
351 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
353 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
356 static phys_addr_t __init alloc_pte_late(uintptr_t va)
360 vaddr = __get_free_page(GFP_KERNEL);
361 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
366 static void __init create_pte_mapping(pte_t *ptep,
367 uintptr_t va, phys_addr_t pa,
368 phys_addr_t sz, pgprot_t prot)
370 uintptr_t pte_idx = pte_index(va);
372 BUG_ON(sz != PAGE_SIZE);
374 if (pte_none(ptep[pte_idx]))
375 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
378 #ifndef __PAGETABLE_PMD_FOLDED
380 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
381 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
382 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
384 #ifdef CONFIG_XIP_KERNEL
385 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
386 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
387 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
388 #endif /* CONFIG_XIP_KERNEL */
390 static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss;
391 static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss;
392 static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE);
394 #ifdef CONFIG_XIP_KERNEL
395 #define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d))
396 #define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d))
397 #define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d))
398 #endif /* CONFIG_XIP_KERNEL */
400 static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss;
401 static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss;
402 static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
404 #ifdef CONFIG_XIP_KERNEL
405 #define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud))
406 #define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud))
407 #define early_pud ((pud_t *)XIP_FIXUP(early_pud))
408 #endif /* CONFIG_XIP_KERNEL */
410 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
412 /* Before MMU is enabled */
413 return (pmd_t *)((uintptr_t)pa);
416 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
418 clear_fixmap(FIX_PMD);
419 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
422 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
424 return (pmd_t *) __va(pa);
427 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
429 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT);
431 return (uintptr_t)early_pmd;
434 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
436 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
439 static phys_addr_t __init alloc_pmd_late(uintptr_t va)
443 vaddr = __get_free_page(GFP_KERNEL);
444 BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr)));
449 static void __init create_pmd_mapping(pmd_t *pmdp,
450 uintptr_t va, phys_addr_t pa,
451 phys_addr_t sz, pgprot_t prot)
454 phys_addr_t pte_phys;
455 uintptr_t pmd_idx = pmd_index(va);
457 if (sz == PMD_SIZE) {
458 if (pmd_none(pmdp[pmd_idx]))
459 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
463 if (pmd_none(pmdp[pmd_idx])) {
464 pte_phys = pt_ops.alloc_pte(va);
465 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
466 ptep = pt_ops.get_pte_virt(pte_phys);
467 memset(ptep, 0, PAGE_SIZE);
469 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
470 ptep = pt_ops.get_pte_virt(pte_phys);
473 create_pte_mapping(ptep, va, pa, sz, prot);
476 static pud_t *__init get_pud_virt_early(phys_addr_t pa)
478 return (pud_t *)((uintptr_t)pa);
481 static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa)
483 clear_fixmap(FIX_PUD);
484 return (pud_t *)set_fixmap_offset(FIX_PUD, pa);
487 static pud_t *__init get_pud_virt_late(phys_addr_t pa)
489 return (pud_t *)__va(pa);
492 static phys_addr_t __init alloc_pud_early(uintptr_t va)
494 /* Only one PUD is available for early mapping */
495 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
497 return (uintptr_t)early_pud;
500 static phys_addr_t __init alloc_pud_fixmap(uintptr_t va)
502 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
505 static phys_addr_t alloc_pud_late(uintptr_t va)
509 vaddr = __get_free_page(GFP_KERNEL);
514 static p4d_t *__init get_p4d_virt_early(phys_addr_t pa)
516 return (p4d_t *)((uintptr_t)pa);
519 static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa)
521 clear_fixmap(FIX_P4D);
522 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa);
525 static p4d_t *__init get_p4d_virt_late(phys_addr_t pa)
527 return (p4d_t *)__va(pa);
530 static phys_addr_t __init alloc_p4d_early(uintptr_t va)
532 /* Only one P4D is available for early mapping */
533 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
535 return (uintptr_t)early_p4d;
538 static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va)
540 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
543 static phys_addr_t alloc_p4d_late(uintptr_t va)
547 vaddr = __get_free_page(GFP_KERNEL);
552 static void __init create_pud_mapping(pud_t *pudp,
553 uintptr_t va, phys_addr_t pa,
554 phys_addr_t sz, pgprot_t prot)
557 phys_addr_t next_phys;
558 uintptr_t pud_index = pud_index(va);
560 if (sz == PUD_SIZE) {
561 if (pud_val(pudp[pud_index]) == 0)
562 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot);
566 if (pud_val(pudp[pud_index]) == 0) {
567 next_phys = pt_ops.alloc_pmd(va);
568 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE);
569 nextp = pt_ops.get_pmd_virt(next_phys);
570 memset(nextp, 0, PAGE_SIZE);
572 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index]));
573 nextp = pt_ops.get_pmd_virt(next_phys);
576 create_pmd_mapping(nextp, va, pa, sz, prot);
579 static void __init create_p4d_mapping(p4d_t *p4dp,
580 uintptr_t va, phys_addr_t pa,
581 phys_addr_t sz, pgprot_t prot)
584 phys_addr_t next_phys;
585 uintptr_t p4d_index = p4d_index(va);
587 if (sz == P4D_SIZE) {
588 if (p4d_val(p4dp[p4d_index]) == 0)
589 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot);
593 if (p4d_val(p4dp[p4d_index]) == 0) {
594 next_phys = pt_ops.alloc_pud(va);
595 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE);
596 nextp = pt_ops.get_pud_virt(next_phys);
597 memset(nextp, 0, PAGE_SIZE);
599 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index]));
600 nextp = pt_ops.get_pud_virt(next_phys);
603 create_pud_mapping(nextp, va, pa, sz, prot);
606 #define pgd_next_t p4d_t
607 #define alloc_pgd_next(__va) (pgtable_l5_enabled ? \
608 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \
609 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va)))
610 #define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \
611 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \
612 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa)))
613 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
614 (pgtable_l5_enabled ? \
615 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \
616 (pgtable_l4_enabled ? \
617 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \
618 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot)))
619 #define fixmap_pgd_next (pgtable_l5_enabled ? \
620 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \
621 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd))
622 #define trampoline_pgd_next (pgtable_l5_enabled ? \
623 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \
624 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd))
625 #define early_dtb_pgd_next (pgtable_l5_enabled ? \
626 (uintptr_t)early_dtb_p4d : (pgtable_l4_enabled ? \
627 (uintptr_t)early_dtb_pud : (uintptr_t)early_dtb_pmd))
629 #define pgd_next_t pte_t
630 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
631 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
632 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
633 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
634 #define fixmap_pgd_next ((uintptr_t)fixmap_pte)
635 #define early_dtb_pgd_next ((uintptr_t)early_dtb_pmd)
636 #define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
637 #define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
638 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
639 #endif /* __PAGETABLE_PMD_FOLDED */
641 void __init create_pgd_mapping(pgd_t *pgdp,
642 uintptr_t va, phys_addr_t pa,
643 phys_addr_t sz, pgprot_t prot)
646 phys_addr_t next_phys;
647 uintptr_t pgd_idx = pgd_index(va);
649 if (sz == PGDIR_SIZE) {
650 if (pgd_val(pgdp[pgd_idx]) == 0)
651 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
655 if (pgd_val(pgdp[pgd_idx]) == 0) {
656 next_phys = alloc_pgd_next(va);
657 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
658 nextp = get_pgd_next_virt(next_phys);
659 memset(nextp, 0, PAGE_SIZE);
661 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
662 nextp = get_pgd_next_virt(next_phys);
665 create_pgd_next_mapping(nextp, va, pa, sz, prot);
668 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
670 /* Upgrade to PMD_SIZE mappings whenever possible */
671 base &= PMD_SIZE - 1;
672 if (!base && size >= PMD_SIZE)
678 #ifdef CONFIG_XIP_KERNEL
679 #define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base))
680 extern char _xiprom[], _exiprom[], __data_loc;
682 /* called from head.S with MMU off */
683 asmlinkage void __init __copy_data(void)
685 void *from = (void *)(&__data_loc);
686 void *to = (void *)CONFIG_PHYS_RAM_BASE;
687 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata));
689 memcpy(to, from, sz);
693 #ifdef CONFIG_STRICT_KERNEL_RWX
694 static __init pgprot_t pgprot_from_va(uintptr_t va)
696 if (is_va_kernel_text(va))
697 return PAGE_KERNEL_READ_EXEC;
700 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
701 * we must protect its linear mapping alias from being executed and
703 * And rodata section is marked readonly in mark_rodata_ro.
705 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
706 return PAGE_KERNEL_READ;
711 void mark_rodata_ro(void)
713 set_kernel_memory(__start_rodata, _data, set_memory_ro);
714 if (IS_ENABLED(CONFIG_64BIT))
715 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
721 static __init pgprot_t pgprot_from_va(uintptr_t va)
723 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
726 return PAGE_KERNEL_EXEC;
728 #endif /* CONFIG_STRICT_KERNEL_RWX */
730 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
731 static void __init disable_pgtable_l5(void)
733 pgtable_l5_enabled = false;
734 kernel_map.page_offset = PAGE_OFFSET_L4;
735 satp_mode = SATP_MODE_48;
738 static void __init disable_pgtable_l4(void)
740 pgtable_l4_enabled = false;
741 kernel_map.page_offset = PAGE_OFFSET_L3;
742 satp_mode = SATP_MODE_39;
746 * There is a simple way to determine if 4-level is supported by the
747 * underlying hardware: establish 1:1 mapping in 4-level page table mode
748 * then read SATP to see if the configuration was taken into account
749 * meaning sv48 is supported.
751 static __init void set_satp_mode(void)
753 u64 identity_satp, hw_satp;
754 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK;
755 bool check_l4 = false;
757 create_p4d_mapping(early_p4d,
758 set_satp_mode_pmd, (uintptr_t)early_pud,
759 P4D_SIZE, PAGE_TABLE);
760 create_pud_mapping(early_pud,
761 set_satp_mode_pmd, (uintptr_t)early_pmd,
762 PUD_SIZE, PAGE_TABLE);
763 /* Handle the case where set_satp_mode straddles 2 PMDs */
764 create_pmd_mapping(early_pmd,
765 set_satp_mode_pmd, set_satp_mode_pmd,
766 PMD_SIZE, PAGE_KERNEL_EXEC);
767 create_pmd_mapping(early_pmd,
768 set_satp_mode_pmd + PMD_SIZE,
769 set_satp_mode_pmd + PMD_SIZE,
770 PMD_SIZE, PAGE_KERNEL_EXEC);
772 create_pgd_mapping(early_pg_dir,
774 check_l4 ? (uintptr_t)early_pud : (uintptr_t)early_p4d,
775 PGDIR_SIZE, PAGE_TABLE);
777 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode;
779 local_flush_tlb_all();
780 csr_write(CSR_SATP, identity_satp);
781 hw_satp = csr_swap(CSR_SATP, 0ULL);
782 local_flush_tlb_all();
784 if (hw_satp != identity_satp) {
786 disable_pgtable_l5();
788 memset(early_pg_dir, 0, PAGE_SIZE);
791 disable_pgtable_l4();
794 memset(early_pg_dir, 0, PAGE_SIZE);
795 memset(early_p4d, 0, PAGE_SIZE);
796 memset(early_pud, 0, PAGE_SIZE);
797 memset(early_pmd, 0, PAGE_SIZE);
802 * setup_vm() is called from head.S with MMU-off.
804 * Following requirements should be honoured for setup_vm() to work
806 * 1) It should use PC-relative addressing for accessing kernel symbols.
807 * To achieve this we always use GCC cmodel=medany.
808 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
809 * so disable compiler instrumentation when FTRACE is enabled.
811 * Currently, the above requirements are honoured by using custom CFLAGS
812 * for init.o in mm/Makefile.
815 #ifndef __riscv_cmodel_medany
816 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
819 #ifdef CONFIG_XIP_KERNEL
820 static void __init create_kernel_page_table(pgd_t *pgdir,
821 __always_unused bool early)
823 uintptr_t va, end_va;
825 /* Map the flash resident part */
826 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
827 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
828 create_pgd_mapping(pgdir, va,
829 kernel_map.xiprom + (va - kernel_map.virt_addr),
830 PMD_SIZE, PAGE_KERNEL_EXEC);
832 /* Map the data in RAM */
833 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size;
834 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE)
835 create_pgd_mapping(pgdir, va,
836 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)),
837 PMD_SIZE, PAGE_KERNEL);
840 static void __init create_kernel_page_table(pgd_t *pgdir, bool early)
842 uintptr_t va, end_va;
844 end_va = kernel_map.virt_addr + kernel_map.size;
845 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
846 create_pgd_mapping(pgdir, va,
847 kernel_map.phys_addr + (va - kernel_map.virt_addr),
850 PAGE_KERNEL_EXEC : pgprot_from_va(va));
855 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
856 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
859 static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa)
861 #ifndef CONFIG_BUILTIN_DTB
862 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
864 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
865 IS_ENABLED(CONFIG_64BIT) ? early_dtb_pgd_next : pa,
867 IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL);
869 if (pgtable_l5_enabled)
870 create_p4d_mapping(early_dtb_p4d, DTB_EARLY_BASE_VA,
871 (uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE);
873 if (pgtable_l4_enabled)
874 create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA,
875 (uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE);
877 if (IS_ENABLED(CONFIG_64BIT)) {
878 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
879 pa, PMD_SIZE, PAGE_KERNEL);
880 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
881 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
884 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
887 * For 64-bit kernel, __va can't be used since it would return a linear
888 * mapping address whereas dtb_early_va will be used before
889 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the
890 * kernel is mapped in the linear mapping, that makes no difference.
892 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
895 dtb_early_pa = dtb_pa;
899 * MMU is not enabled, the page tables are allocated directly using
900 * early_pmd/pud/p4d and the address returned is the physical one.
902 static void __init pt_ops_set_early(void)
904 pt_ops.alloc_pte = alloc_pte_early;
905 pt_ops.get_pte_virt = get_pte_virt_early;
906 #ifndef __PAGETABLE_PMD_FOLDED
907 pt_ops.alloc_pmd = alloc_pmd_early;
908 pt_ops.get_pmd_virt = get_pmd_virt_early;
909 pt_ops.alloc_pud = alloc_pud_early;
910 pt_ops.get_pud_virt = get_pud_virt_early;
911 pt_ops.alloc_p4d = alloc_p4d_early;
912 pt_ops.get_p4d_virt = get_p4d_virt_early;
917 * MMU is enabled but page table setup is not complete yet.
918 * fixmap page table alloc functions must be used as a means to temporarily
919 * map the allocated physical pages since the linear mapping does not exist yet.
921 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va,
922 * but it will be used as described above.
924 static void __init pt_ops_set_fixmap(void)
926 pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap);
927 pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap);
928 #ifndef __PAGETABLE_PMD_FOLDED
929 pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap);
930 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap);
931 pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap);
932 pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap);
933 pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap);
934 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap);
939 * MMU is enabled and page table setup is complete, so from now, we can use
940 * generic page allocation functions to setup page table.
942 static void __init pt_ops_set_late(void)
944 pt_ops.alloc_pte = alloc_pte_late;
945 pt_ops.get_pte_virt = get_pte_virt_late;
946 #ifndef __PAGETABLE_PMD_FOLDED
947 pt_ops.alloc_pmd = alloc_pmd_late;
948 pt_ops.get_pmd_virt = get_pmd_virt_late;
949 pt_ops.alloc_pud = alloc_pud_late;
950 pt_ops.get_pud_virt = get_pud_virt_late;
951 pt_ops.alloc_p4d = alloc_p4d_late;
952 pt_ops.get_p4d_virt = get_p4d_virt_late;
956 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
958 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd;
960 kernel_map.virt_addr = KERNEL_LINK_ADDR;
961 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
963 #ifdef CONFIG_XIP_KERNEL
964 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
965 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
967 phys_ram_base = CONFIG_PHYS_RAM_BASE;
968 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
969 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
971 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
973 kernel_map.phys_addr = (uintptr_t)(&_start);
974 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
977 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
981 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr;
982 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
984 phys_ram_base = kernel_map.phys_addr;
987 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit
988 * kernel, whereas for 64-bit kernel, the end of the virtual address
989 * space is occupied by the modules/BPF/kernel mappings which reduces
990 * the available size of the linear mapping.
992 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0);
994 /* Sanity check alignment and size */
995 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
996 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
1000 * The last 4K bytes of the addressable memory can not be mapped because
1001 * of IS_ERR_VALUE macro.
1003 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
1006 apply_early_boot_alternatives();
1009 /* Setup early PGD for fixmap */
1010 create_pgd_mapping(early_pg_dir, FIXADDR_START,
1011 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1013 #ifndef __PAGETABLE_PMD_FOLDED
1014 /* Setup fixmap P4D and PUD */
1015 if (pgtable_l5_enabled)
1016 create_p4d_mapping(fixmap_p4d, FIXADDR_START,
1017 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE);
1018 /* Setup fixmap PUD and PMD */
1019 if (pgtable_l4_enabled)
1020 create_pud_mapping(fixmap_pud, FIXADDR_START,
1021 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE);
1022 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
1023 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
1024 /* Setup trampoline PGD and PMD */
1025 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1026 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1027 if (pgtable_l5_enabled)
1028 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr,
1029 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE);
1030 if (pgtable_l4_enabled)
1031 create_pud_mapping(trampoline_pud, kernel_map.virt_addr,
1032 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE);
1033 #ifdef CONFIG_XIP_KERNEL
1034 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1035 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
1037 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1038 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
1041 /* Setup trampoline PGD */
1042 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1043 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
1047 * Setup early PGD covering entire kernel which will allow
1048 * us to reach paging_init(). We map all memory banks later
1049 * in setup_vm_final() below.
1051 create_kernel_page_table(early_pg_dir, true);
1053 /* Setup early mapping for FDT early scan */
1054 create_fdt_early_page_table(early_pg_dir, dtb_pa);
1057 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
1058 * range can not span multiple pmds.
1060 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
1061 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
1063 #ifndef __PAGETABLE_PMD_FOLDED
1065 * Early ioremap fixmap is already created as it lies within first 2MB
1066 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
1067 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
1070 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
1071 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
1072 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
1074 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
1075 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
1076 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
1077 fix_to_virt(FIX_BTMAP_BEGIN));
1078 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
1079 fix_to_virt(FIX_BTMAP_END));
1081 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
1082 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
1086 pt_ops_set_fixmap();
1089 static void __init setup_vm_final(void)
1091 uintptr_t va, map_size;
1092 phys_addr_t pa, start, end;
1095 /* Setup swapper PGD for fixmap */
1096 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
1097 __pa_symbol(fixmap_pgd_next),
1098 PGDIR_SIZE, PAGE_TABLE);
1100 /* Map all memory banks in the linear mapping */
1101 for_each_mem_range(i, &start, &end) {
1104 if (start <= __pa(PAGE_OFFSET) &&
1105 __pa(PAGE_OFFSET) < end)
1106 start = __pa(PAGE_OFFSET);
1107 if (end >= __pa(PAGE_OFFSET) + memory_limit)
1108 end = __pa(PAGE_OFFSET) + memory_limit;
1110 for (pa = start; pa < end; pa += map_size) {
1111 va = (uintptr_t)__va(pa);
1112 map_size = best_map_size(pa, end - pa);
1114 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
1115 pgprot_from_va(va));
1119 /* Map the kernel */
1120 if (IS_ENABLED(CONFIG_64BIT))
1121 create_kernel_page_table(swapper_pg_dir, false);
1124 kasan_swapper_init();
1127 /* Clear fixmap PTE and PMD mappings */
1128 clear_fixmap(FIX_PTE);
1129 clear_fixmap(FIX_PMD);
1130 clear_fixmap(FIX_PUD);
1131 clear_fixmap(FIX_P4D);
1133 /* Move to swapper page table */
1134 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode);
1135 local_flush_tlb_all();
1140 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
1142 dtb_early_va = (void *)dtb_pa;
1143 dtb_early_pa = dtb_pa;
1146 static inline void setup_vm_final(void)
1149 #endif /* CONFIG_MMU */
1152 * reserve_crashkernel() - reserves memory for crash kernel
1154 * This function reserves memory area given in "crashkernel=" kernel command
1155 * line parameter. The memory reserved is used by dump capture kernel when
1156 * primary kernel is crashing.
1158 static void __init reserve_crashkernel(void)
1160 unsigned long long crash_base = 0;
1161 unsigned long long crash_size = 0;
1162 unsigned long search_start = memblock_start_of_DRAM();
1163 unsigned long search_end = memblock_end_of_DRAM();
1167 if (!IS_ENABLED(CONFIG_KEXEC_CORE))
1170 * Don't reserve a region for a crash kernel on a crash kernel
1171 * since it doesn't make much sense and we have limited memory
1174 if (is_kdump_kernel()) {
1175 pr_info("crashkernel: ignoring reservation request\n");
1179 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
1180 &crash_size, &crash_base);
1181 if (ret || !crash_size)
1184 crash_size = PAGE_ALIGN(crash_size);
1187 search_start = crash_base;
1188 search_end = crash_base + crash_size;
1192 * Current riscv boot protocol requires 2MB alignment for
1193 * RV64 and 4MB alignment for RV32 (hugepage size)
1195 * Try to alloc from 32bit addressible physical memory so that
1196 * swiotlb can work on the crash kernel.
1198 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
1200 min(search_end, (unsigned long) SZ_4G));
1201 if (crash_base == 0) {
1202 /* Try again without restricting region to 32bit addressible memory */
1203 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
1204 search_start, search_end);
1205 if (crash_base == 0) {
1206 pr_warn("crashkernel: couldn't allocate %lldKB\n",
1212 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
1213 crash_base, crash_base + crash_size, crash_size >> 20);
1215 crashk_res.start = crash_base;
1216 crashk_res.end = crash_base + crash_size - 1;
1219 void __init paging_init(void)
1225 void __init misc_mem_init(void)
1227 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
1231 reserve_crashkernel();
1232 memblock_dump_all();
1235 #ifdef CONFIG_SPARSEMEM_VMEMMAP
1236 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
1237 struct vmem_altmap *altmap)
1239 return vmemmap_populate_basepages(start, end, node, NULL);