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>
23 #ifdef CONFIG_RELOCATABLE
24 #include <linux/elf.h>
27 #include <asm/fixmap.h>
28 #include <asm/tlbflush.h>
29 #include <asm/sections.h>
32 #include <asm/ptdump.h>
35 #include "../kernel/head.h"
37 struct kernel_mapping kernel_map __ro_after_init;
38 EXPORT_SYMBOL(kernel_map);
39 #ifdef CONFIG_XIP_KERNEL
40 #define kernel_map (*(struct kernel_mapping *)XIP_FIXUP(&kernel_map))
44 u64 satp_mode __ro_after_init = !IS_ENABLED(CONFIG_XIP_KERNEL) ? SATP_MODE_57 : SATP_MODE_39;
46 u64 satp_mode __ro_after_init = SATP_MODE_32;
48 EXPORT_SYMBOL(satp_mode);
50 bool pgtable_l4_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
51 bool pgtable_l5_enabled = IS_ENABLED(CONFIG_64BIT) && !IS_ENABLED(CONFIG_XIP_KERNEL);
52 EXPORT_SYMBOL(pgtable_l4_enabled);
53 EXPORT_SYMBOL(pgtable_l5_enabled);
55 phys_addr_t phys_ram_base __ro_after_init;
56 EXPORT_SYMBOL(phys_ram_base);
58 unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
60 EXPORT_SYMBOL(empty_zero_page);
63 void *_dtb_early_va __initdata;
64 uintptr_t _dtb_early_pa __initdata;
66 static phys_addr_t dma32_phys_limit __initdata;
68 static void __init zone_sizes_init(void)
70 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };
72 #ifdef CONFIG_ZONE_DMA32
73 max_zone_pfns[ZONE_DMA32] = PFN_DOWN(dma32_phys_limit);
75 max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
77 free_area_init(max_zone_pfns);
80 #if defined(CONFIG_MMU) && defined(CONFIG_DEBUG_VM)
82 #define LOG2_SZ_1K ilog2(SZ_1K)
83 #define LOG2_SZ_1M ilog2(SZ_1M)
84 #define LOG2_SZ_1G ilog2(SZ_1G)
85 #define LOG2_SZ_1T ilog2(SZ_1T)
87 static inline void print_mlk(char *name, unsigned long b, unsigned long t)
89 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld kB)\n", name, b, t,
90 (((t) - (b)) >> LOG2_SZ_1K));
93 static inline void print_mlm(char *name, unsigned long b, unsigned long t)
95 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld MB)\n", name, b, t,
96 (((t) - (b)) >> LOG2_SZ_1M));
99 static inline void print_mlg(char *name, unsigned long b, unsigned long t)
101 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld GB)\n", name, b, t,
102 (((t) - (b)) >> LOG2_SZ_1G));
106 static inline void print_mlt(char *name, unsigned long b, unsigned long t)
108 pr_notice("%12s : 0x%08lx - 0x%08lx (%4ld TB)\n", name, b, t,
109 (((t) - (b)) >> LOG2_SZ_1T));
112 #define print_mlt(n, b, t) do {} while (0)
115 static inline void print_ml(char *name, unsigned long b, unsigned long t)
117 unsigned long diff = t - b;
119 if (IS_ENABLED(CONFIG_64BIT) && (diff >> LOG2_SZ_1T) >= 10)
120 print_mlt(name, b, t);
121 else if ((diff >> LOG2_SZ_1G) >= 10)
122 print_mlg(name, b, t);
123 else if ((diff >> LOG2_SZ_1M) >= 10)
124 print_mlm(name, b, t);
126 print_mlk(name, b, t);
129 static void __init print_vm_layout(void)
131 pr_notice("Virtual kernel memory layout:\n");
132 print_ml("fixmap", (unsigned long)FIXADDR_START,
133 (unsigned long)FIXADDR_TOP);
134 print_ml("pci io", (unsigned long)PCI_IO_START,
135 (unsigned long)PCI_IO_END);
136 print_ml("vmemmap", (unsigned long)VMEMMAP_START,
137 (unsigned long)VMEMMAP_END);
138 print_ml("vmalloc", (unsigned long)VMALLOC_START,
139 (unsigned long)VMALLOC_END);
141 print_ml("modules", (unsigned long)MODULES_VADDR,
142 (unsigned long)MODULES_END);
144 print_ml("lowmem", (unsigned long)PAGE_OFFSET,
145 (unsigned long)high_memory);
146 if (IS_ENABLED(CONFIG_64BIT)) {
148 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END);
151 print_ml("kernel", (unsigned long)kernel_map.virt_addr,
152 (unsigned long)ADDRESS_SPACE_END);
156 static void print_vm_layout(void) { }
157 #endif /* CONFIG_DEBUG_VM */
159 void __init mem_init(void)
161 #ifdef CONFIG_FLATMEM
163 #endif /* CONFIG_FLATMEM */
165 swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE);
171 /* Limit the memory size via mem. */
172 static phys_addr_t memory_limit;
174 static int __init early_mem(char *p)
181 size = memparse(p, &p) & PAGE_MASK;
182 memory_limit = min_t(u64, size, memory_limit);
184 pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20);
188 early_param("mem", early_mem);
190 static void __init setup_bootmem(void)
192 phys_addr_t vmlinux_end = __pa_symbol(&_end);
193 phys_addr_t max_mapped_addr;
194 phys_addr_t phys_ram_end, vmlinux_start;
196 if (IS_ENABLED(CONFIG_XIP_KERNEL))
197 vmlinux_start = __pa_symbol(&_sdata);
199 vmlinux_start = __pa_symbol(&_start);
201 memblock_enforce_memory_limit(memory_limit);
204 * Make sure we align the reservation on PMD_SIZE since we will
205 * map the kernel in the linear mapping as read-only: we do not want
206 * any allocation to happen between _end and the next pmd aligned page.
208 if (IS_ENABLED(CONFIG_64BIT) && IS_ENABLED(CONFIG_STRICT_KERNEL_RWX))
209 vmlinux_end = (vmlinux_end + PMD_SIZE - 1) & PMD_MASK;
211 * Reserve from the start of the kernel to the end of the kernel
213 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
215 phys_ram_end = memblock_end_of_DRAM();
216 if (!IS_ENABLED(CONFIG_XIP_KERNEL))
217 phys_ram_base = memblock_start_of_DRAM();
220 * In 64-bit, any use of __va/__pa before this point is wrong as we
221 * did not know the start of DRAM before.
223 if (IS_ENABLED(CONFIG_64BIT))
224 kernel_map.va_pa_offset = PAGE_OFFSET - phys_ram_base;
227 * memblock allocator is not aware of the fact that last 4K bytes of
228 * the addressable memory can not be mapped because of IS_ERR_VALUE
229 * macro. Make sure that last 4k bytes are not usable by memblock
230 * if end of dram is equal to maximum addressable memory. For 64-bit
231 * kernel, this problem can't happen here as the end of the virtual
232 * address space is occupied by the kernel mapping then this check must
233 * be done as soon as the kernel mapping base address is determined.
235 if (!IS_ENABLED(CONFIG_64BIT)) {
236 max_mapped_addr = __pa(~(ulong)0);
237 if (max_mapped_addr == (phys_ram_end - 1))
238 memblock_set_current_limit(max_mapped_addr - 4096);
241 min_low_pfn = PFN_UP(phys_ram_base);
242 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
243 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
245 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
246 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
248 reserve_initrd_mem();
251 * No allocation should be done before reserving the memory as defined
252 * in the device tree, otherwise the allocation could end up in a
255 early_init_fdt_scan_reserved_mem();
258 * If DTB is built in, no need to reserve its memblock.
259 * Otherwise, do reserve it but avoid using
260 * early_init_fdt_reserve_self() since __pa() does
261 * not work for DTB pointers that are fixmap addresses
263 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
264 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
266 dma_contiguous_reserve(dma32_phys_limit);
267 if (IS_ENABLED(CONFIG_64BIT))
268 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
269 memblock_allow_resize();
273 struct pt_alloc_ops pt_ops __initdata;
275 pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
276 pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
277 static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
279 pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
281 #ifdef CONFIG_XIP_KERNEL
282 #define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
283 #define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
284 #define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
285 #define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
286 #endif /* CONFIG_XIP_KERNEL */
288 static const pgprot_t protection_map[16] = {
289 [VM_NONE] = PAGE_NONE,
290 [VM_READ] = PAGE_READ,
291 [VM_WRITE] = PAGE_COPY,
292 [VM_WRITE | VM_READ] = PAGE_COPY,
293 [VM_EXEC] = PAGE_EXEC,
294 [VM_EXEC | VM_READ] = PAGE_READ_EXEC,
295 [VM_EXEC | VM_WRITE] = PAGE_COPY_EXEC,
296 [VM_EXEC | VM_WRITE | VM_READ] = PAGE_COPY_READ_EXEC,
297 [VM_SHARED] = PAGE_NONE,
298 [VM_SHARED | VM_READ] = PAGE_READ,
299 [VM_SHARED | VM_WRITE] = PAGE_SHARED,
300 [VM_SHARED | VM_WRITE | VM_READ] = PAGE_SHARED,
301 [VM_SHARED | VM_EXEC] = PAGE_EXEC,
302 [VM_SHARED | VM_EXEC | VM_READ] = PAGE_READ_EXEC,
303 [VM_SHARED | VM_EXEC | VM_WRITE] = PAGE_SHARED_EXEC,
304 [VM_SHARED | VM_EXEC | VM_WRITE | VM_READ] = PAGE_SHARED_EXEC
306 DECLARE_VM_GET_PAGE_PROT
308 void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot)
310 unsigned long addr = __fix_to_virt(idx);
313 BUG_ON(idx <= FIX_HOLE || idx >= __end_of_fixed_addresses);
315 ptep = &fixmap_pte[pte_index(addr)];
317 if (pgprot_val(prot))
318 set_pte(ptep, pfn_pte(phys >> PAGE_SHIFT, prot));
320 pte_clear(&init_mm, addr, ptep);
321 local_flush_tlb_page(addr);
324 static inline pte_t *__init get_pte_virt_early(phys_addr_t pa)
326 return (pte_t *)((uintptr_t)pa);
329 static inline pte_t *__init get_pte_virt_fixmap(phys_addr_t pa)
331 clear_fixmap(FIX_PTE);
332 return (pte_t *)set_fixmap_offset(FIX_PTE, pa);
335 static inline pte_t *__init get_pte_virt_late(phys_addr_t pa)
337 return (pte_t *) __va(pa);
340 static inline phys_addr_t __init alloc_pte_early(uintptr_t va)
343 * We only create PMD or PGD early mappings so we
344 * should never reach here with MMU disabled.
349 static inline phys_addr_t __init alloc_pte_fixmap(uintptr_t va)
351 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
354 static phys_addr_t __init alloc_pte_late(uintptr_t va)
358 vaddr = __get_free_page(GFP_KERNEL);
359 BUG_ON(!vaddr || !pgtable_pte_page_ctor(virt_to_page(vaddr)));
364 static void __init create_pte_mapping(pte_t *ptep,
365 uintptr_t va, phys_addr_t pa,
366 phys_addr_t sz, pgprot_t prot)
368 uintptr_t pte_idx = pte_index(va);
370 BUG_ON(sz != PAGE_SIZE);
372 if (pte_none(ptep[pte_idx]))
373 ptep[pte_idx] = pfn_pte(PFN_DOWN(pa), prot);
376 #ifndef __PAGETABLE_PMD_FOLDED
378 static pmd_t trampoline_pmd[PTRS_PER_PMD] __page_aligned_bss;
379 static pmd_t fixmap_pmd[PTRS_PER_PMD] __page_aligned_bss;
380 static pmd_t early_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
382 #ifdef CONFIG_XIP_KERNEL
383 #define trampoline_pmd ((pmd_t *)XIP_FIXUP(trampoline_pmd))
384 #define fixmap_pmd ((pmd_t *)XIP_FIXUP(fixmap_pmd))
385 #define early_pmd ((pmd_t *)XIP_FIXUP(early_pmd))
386 #endif /* CONFIG_XIP_KERNEL */
388 static p4d_t trampoline_p4d[PTRS_PER_P4D] __page_aligned_bss;
389 static p4d_t fixmap_p4d[PTRS_PER_P4D] __page_aligned_bss;
390 static p4d_t early_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE);
392 #ifdef CONFIG_XIP_KERNEL
393 #define trampoline_p4d ((p4d_t *)XIP_FIXUP(trampoline_p4d))
394 #define fixmap_p4d ((p4d_t *)XIP_FIXUP(fixmap_p4d))
395 #define early_p4d ((p4d_t *)XIP_FIXUP(early_p4d))
396 #endif /* CONFIG_XIP_KERNEL */
398 static pud_t trampoline_pud[PTRS_PER_PUD] __page_aligned_bss;
399 static pud_t fixmap_pud[PTRS_PER_PUD] __page_aligned_bss;
400 static pud_t early_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
402 #ifdef CONFIG_XIP_KERNEL
403 #define trampoline_pud ((pud_t *)XIP_FIXUP(trampoline_pud))
404 #define fixmap_pud ((pud_t *)XIP_FIXUP(fixmap_pud))
405 #define early_pud ((pud_t *)XIP_FIXUP(early_pud))
406 #endif /* CONFIG_XIP_KERNEL */
408 static pmd_t *__init get_pmd_virt_early(phys_addr_t pa)
410 /* Before MMU is enabled */
411 return (pmd_t *)((uintptr_t)pa);
414 static pmd_t *__init get_pmd_virt_fixmap(phys_addr_t pa)
416 clear_fixmap(FIX_PMD);
417 return (pmd_t *)set_fixmap_offset(FIX_PMD, pa);
420 static pmd_t *__init get_pmd_virt_late(phys_addr_t pa)
422 return (pmd_t *) __va(pa);
425 static phys_addr_t __init alloc_pmd_early(uintptr_t va)
427 BUG_ON((va - kernel_map.virt_addr) >> PUD_SHIFT);
429 return (uintptr_t)early_pmd;
432 static phys_addr_t __init alloc_pmd_fixmap(uintptr_t va)
434 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
437 static phys_addr_t __init alloc_pmd_late(uintptr_t va)
441 vaddr = __get_free_page(GFP_KERNEL);
442 BUG_ON(!vaddr || !pgtable_pmd_page_ctor(virt_to_page(vaddr)));
447 static void __init create_pmd_mapping(pmd_t *pmdp,
448 uintptr_t va, phys_addr_t pa,
449 phys_addr_t sz, pgprot_t prot)
452 phys_addr_t pte_phys;
453 uintptr_t pmd_idx = pmd_index(va);
455 if (sz == PMD_SIZE) {
456 if (pmd_none(pmdp[pmd_idx]))
457 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pa), prot);
461 if (pmd_none(pmdp[pmd_idx])) {
462 pte_phys = pt_ops.alloc_pte(va);
463 pmdp[pmd_idx] = pfn_pmd(PFN_DOWN(pte_phys), PAGE_TABLE);
464 ptep = pt_ops.get_pte_virt(pte_phys);
465 memset(ptep, 0, PAGE_SIZE);
467 pte_phys = PFN_PHYS(_pmd_pfn(pmdp[pmd_idx]));
468 ptep = pt_ops.get_pte_virt(pte_phys);
471 create_pte_mapping(ptep, va, pa, sz, prot);
474 static pud_t *__init get_pud_virt_early(phys_addr_t pa)
476 return (pud_t *)((uintptr_t)pa);
479 static pud_t *__init get_pud_virt_fixmap(phys_addr_t pa)
481 clear_fixmap(FIX_PUD);
482 return (pud_t *)set_fixmap_offset(FIX_PUD, pa);
485 static pud_t *__init get_pud_virt_late(phys_addr_t pa)
487 return (pud_t *)__va(pa);
490 static phys_addr_t __init alloc_pud_early(uintptr_t va)
492 /* Only one PUD is available for early mapping */
493 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
495 return (uintptr_t)early_pud;
498 static phys_addr_t __init alloc_pud_fixmap(uintptr_t va)
500 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
503 static phys_addr_t alloc_pud_late(uintptr_t va)
507 vaddr = __get_free_page(GFP_KERNEL);
512 static p4d_t *__init get_p4d_virt_early(phys_addr_t pa)
514 return (p4d_t *)((uintptr_t)pa);
517 static p4d_t *__init get_p4d_virt_fixmap(phys_addr_t pa)
519 clear_fixmap(FIX_P4D);
520 return (p4d_t *)set_fixmap_offset(FIX_P4D, pa);
523 static p4d_t *__init get_p4d_virt_late(phys_addr_t pa)
525 return (p4d_t *)__va(pa);
528 static phys_addr_t __init alloc_p4d_early(uintptr_t va)
530 /* Only one P4D is available for early mapping */
531 BUG_ON((va - kernel_map.virt_addr) >> PGDIR_SHIFT);
533 return (uintptr_t)early_p4d;
536 static phys_addr_t __init alloc_p4d_fixmap(uintptr_t va)
538 return memblock_phys_alloc(PAGE_SIZE, PAGE_SIZE);
541 static phys_addr_t alloc_p4d_late(uintptr_t va)
545 vaddr = __get_free_page(GFP_KERNEL);
550 static void __init create_pud_mapping(pud_t *pudp,
551 uintptr_t va, phys_addr_t pa,
552 phys_addr_t sz, pgprot_t prot)
555 phys_addr_t next_phys;
556 uintptr_t pud_index = pud_index(va);
558 if (sz == PUD_SIZE) {
559 if (pud_val(pudp[pud_index]) == 0)
560 pudp[pud_index] = pfn_pud(PFN_DOWN(pa), prot);
564 if (pud_val(pudp[pud_index]) == 0) {
565 next_phys = pt_ops.alloc_pmd(va);
566 pudp[pud_index] = pfn_pud(PFN_DOWN(next_phys), PAGE_TABLE);
567 nextp = pt_ops.get_pmd_virt(next_phys);
568 memset(nextp, 0, PAGE_SIZE);
570 next_phys = PFN_PHYS(_pud_pfn(pudp[pud_index]));
571 nextp = pt_ops.get_pmd_virt(next_phys);
574 create_pmd_mapping(nextp, va, pa, sz, prot);
577 static void __init create_p4d_mapping(p4d_t *p4dp,
578 uintptr_t va, phys_addr_t pa,
579 phys_addr_t sz, pgprot_t prot)
582 phys_addr_t next_phys;
583 uintptr_t p4d_index = p4d_index(va);
585 if (sz == P4D_SIZE) {
586 if (p4d_val(p4dp[p4d_index]) == 0)
587 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(pa), prot);
591 if (p4d_val(p4dp[p4d_index]) == 0) {
592 next_phys = pt_ops.alloc_pud(va);
593 p4dp[p4d_index] = pfn_p4d(PFN_DOWN(next_phys), PAGE_TABLE);
594 nextp = pt_ops.get_pud_virt(next_phys);
595 memset(nextp, 0, PAGE_SIZE);
597 next_phys = PFN_PHYS(_p4d_pfn(p4dp[p4d_index]));
598 nextp = pt_ops.get_pud_virt(next_phys);
601 create_pud_mapping(nextp, va, pa, sz, prot);
604 #define pgd_next_t p4d_t
605 #define alloc_pgd_next(__va) (pgtable_l5_enabled ? \
606 pt_ops.alloc_p4d(__va) : (pgtable_l4_enabled ? \
607 pt_ops.alloc_pud(__va) : pt_ops.alloc_pmd(__va)))
608 #define get_pgd_next_virt(__pa) (pgtable_l5_enabled ? \
609 pt_ops.get_p4d_virt(__pa) : (pgd_next_t *)(pgtable_l4_enabled ? \
610 pt_ops.get_pud_virt(__pa) : (pud_t *)pt_ops.get_pmd_virt(__pa)))
611 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
612 (pgtable_l5_enabled ? \
613 create_p4d_mapping(__nextp, __va, __pa, __sz, __prot) : \
614 (pgtable_l4_enabled ? \
615 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \
616 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot)))
617 #define fixmap_pgd_next (pgtable_l5_enabled ? \
618 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \
619 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd))
620 #define trampoline_pgd_next (pgtable_l5_enabled ? \
621 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \
622 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd))
624 #define pgd_next_t pte_t
625 #define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
626 #define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
627 #define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
628 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
629 #define fixmap_pgd_next ((uintptr_t)fixmap_pte)
630 #define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
631 #define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
632 #define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
633 #endif /* __PAGETABLE_PMD_FOLDED */
635 void __init create_pgd_mapping(pgd_t *pgdp,
636 uintptr_t va, phys_addr_t pa,
637 phys_addr_t sz, pgprot_t prot)
640 phys_addr_t next_phys;
641 uintptr_t pgd_idx = pgd_index(va);
643 if (sz == PGDIR_SIZE) {
644 if (pgd_val(pgdp[pgd_idx]) == 0)
645 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(pa), prot);
649 if (pgd_val(pgdp[pgd_idx]) == 0) {
650 next_phys = alloc_pgd_next(va);
651 pgdp[pgd_idx] = pfn_pgd(PFN_DOWN(next_phys), PAGE_TABLE);
652 nextp = get_pgd_next_virt(next_phys);
653 memset(nextp, 0, PAGE_SIZE);
655 next_phys = PFN_PHYS(_pgd_pfn(pgdp[pgd_idx]));
656 nextp = get_pgd_next_virt(next_phys);
659 create_pgd_next_mapping(nextp, va, pa, sz, prot);
662 static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
664 if (!(base & (PGDIR_SIZE - 1)) && size >= PGDIR_SIZE)
667 if (!(base & (P4D_SIZE - 1)) && size >= P4D_SIZE)
670 if (!(base & (PUD_SIZE - 1)) && size >= PUD_SIZE)
673 if (!(base & (PMD_SIZE - 1)) && size >= PMD_SIZE)
679 #ifdef CONFIG_XIP_KERNEL
680 #define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base))
681 extern char _xiprom[], _exiprom[], __data_loc;
683 /* called from head.S with MMU off */
684 asmlinkage void __init __copy_data(void)
686 void *from = (void *)(&__data_loc);
687 void *to = (void *)CONFIG_PHYS_RAM_BASE;
688 size_t sz = (size_t)((uintptr_t)(&_end) - (uintptr_t)(&_sdata));
690 memcpy(to, from, sz);
694 #ifdef CONFIG_STRICT_KERNEL_RWX
695 static __init pgprot_t pgprot_from_va(uintptr_t va)
697 if (is_va_kernel_text(va))
698 return PAGE_KERNEL_READ_EXEC;
701 * In 64-bit kernel, the kernel mapping is outside the linear mapping so
702 * we must protect its linear mapping alias from being executed and
704 * And rodata section is marked readonly in mark_rodata_ro.
706 if (IS_ENABLED(CONFIG_64BIT) && is_va_kernel_lm_alias_text(va))
707 return PAGE_KERNEL_READ;
712 void mark_rodata_ro(void)
714 set_kernel_memory(__start_rodata, _data, set_memory_ro);
715 if (IS_ENABLED(CONFIG_64BIT))
716 set_kernel_memory(lm_alias(__start_rodata), lm_alias(_data),
722 static __init pgprot_t pgprot_from_va(uintptr_t va)
724 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
727 return PAGE_KERNEL_EXEC;
729 #endif /* CONFIG_STRICT_KERNEL_RWX */
731 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
732 u64 __pi_set_satp_mode_from_cmdline(uintptr_t dtb_pa);
734 static void __init disable_pgtable_l5(void)
736 pgtable_l5_enabled = false;
737 kernel_map.page_offset = PAGE_OFFSET_L4;
738 satp_mode = SATP_MODE_48;
741 static void __init disable_pgtable_l4(void)
743 pgtable_l4_enabled = false;
744 kernel_map.page_offset = PAGE_OFFSET_L3;
745 satp_mode = SATP_MODE_39;
748 static int __init print_no4lvl(char *p)
750 pr_info("Disabled 4-level and 5-level paging");
753 early_param("no4lvl", print_no4lvl);
755 static int __init print_no5lvl(char *p)
757 pr_info("Disabled 5-level paging");
760 early_param("no5lvl", print_no5lvl);
763 * There is a simple way to determine if 4-level is supported by the
764 * underlying hardware: establish 1:1 mapping in 4-level page table mode
765 * then read SATP to see if the configuration was taken into account
766 * meaning sv48 is supported.
768 static __init void set_satp_mode(uintptr_t dtb_pa)
770 u64 identity_satp, hw_satp;
771 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK;
772 u64 satp_mode_cmdline = __pi_set_satp_mode_from_cmdline(dtb_pa);
774 if (satp_mode_cmdline == SATP_MODE_57) {
775 disable_pgtable_l5();
776 } else if (satp_mode_cmdline == SATP_MODE_48) {
777 disable_pgtable_l5();
778 disable_pgtable_l4();
782 create_p4d_mapping(early_p4d,
783 set_satp_mode_pmd, (uintptr_t)early_pud,
784 P4D_SIZE, PAGE_TABLE);
785 create_pud_mapping(early_pud,
786 set_satp_mode_pmd, (uintptr_t)early_pmd,
787 PUD_SIZE, PAGE_TABLE);
788 /* Handle the case where set_satp_mode straddles 2 PMDs */
789 create_pmd_mapping(early_pmd,
790 set_satp_mode_pmd, set_satp_mode_pmd,
791 PMD_SIZE, PAGE_KERNEL_EXEC);
792 create_pmd_mapping(early_pmd,
793 set_satp_mode_pmd + PMD_SIZE,
794 set_satp_mode_pmd + PMD_SIZE,
795 PMD_SIZE, PAGE_KERNEL_EXEC);
797 create_pgd_mapping(early_pg_dir,
800 (uintptr_t)early_p4d : (uintptr_t)early_pud,
801 PGDIR_SIZE, PAGE_TABLE);
803 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode;
805 local_flush_tlb_all();
806 csr_write(CSR_SATP, identity_satp);
807 hw_satp = csr_swap(CSR_SATP, 0ULL);
808 local_flush_tlb_all();
810 if (hw_satp != identity_satp) {
811 if (pgtable_l5_enabled) {
812 disable_pgtable_l5();
813 memset(early_pg_dir, 0, PAGE_SIZE);
816 disable_pgtable_l4();
819 memset(early_pg_dir, 0, PAGE_SIZE);
820 memset(early_p4d, 0, PAGE_SIZE);
821 memset(early_pud, 0, PAGE_SIZE);
822 memset(early_pmd, 0, PAGE_SIZE);
827 * setup_vm() is called from head.S with MMU-off.
829 * Following requirements should be honoured for setup_vm() to work
831 * 1) It should use PC-relative addressing for accessing kernel symbols.
832 * To achieve this we always use GCC cmodel=medany.
833 * 2) The compiler instrumentation for FTRACE will not work for setup_vm()
834 * so disable compiler instrumentation when FTRACE is enabled.
836 * Currently, the above requirements are honoured by using custom CFLAGS
837 * for init.o in mm/Makefile.
840 #ifndef __riscv_cmodel_medany
841 #error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
844 #ifdef CONFIG_RELOCATABLE
845 extern unsigned long __rela_dyn_start, __rela_dyn_end;
847 static void __init relocate_kernel(void)
849 Elf64_Rela *rela = (Elf64_Rela *)&__rela_dyn_start;
851 * This holds the offset between the linked virtual address and the
852 * relocated virtual address.
854 uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR;
856 * This holds the offset between kernel linked virtual address and
859 uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr;
861 for ( ; rela < (Elf64_Rela *)&__rela_dyn_end; rela++) {
862 Elf64_Addr addr = (rela->r_offset - va_kernel_link_pa_offset);
863 Elf64_Addr relocated_addr = rela->r_addend;
865 if (rela->r_info != R_RISCV_RELATIVE)
869 * Make sure to not relocate vdso symbols like rt_sigreturn
870 * which are linked from the address 0 in vmlinux since
871 * vdso symbol addresses are actually used as an offset from
872 * mm->context.vdso in VDSO_OFFSET macro.
874 if (relocated_addr >= KERNEL_LINK_ADDR)
875 relocated_addr += reloc_offset;
877 *(Elf64_Addr *)addr = relocated_addr;
880 #endif /* CONFIG_RELOCATABLE */
882 #ifdef CONFIG_XIP_KERNEL
883 static void __init create_kernel_page_table(pgd_t *pgdir,
884 __always_unused bool early)
886 uintptr_t va, end_va;
888 /* Map the flash resident part */
889 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;
890 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
891 create_pgd_mapping(pgdir, va,
892 kernel_map.xiprom + (va - kernel_map.virt_addr),
893 PMD_SIZE, PAGE_KERNEL_EXEC);
895 /* Map the data in RAM */
896 end_va = kernel_map.virt_addr + XIP_OFFSET + kernel_map.size;
897 for (va = kernel_map.virt_addr + XIP_OFFSET; va < end_va; va += PMD_SIZE)
898 create_pgd_mapping(pgdir, va,
899 kernel_map.phys_addr + (va - (kernel_map.virt_addr + XIP_OFFSET)),
900 PMD_SIZE, PAGE_KERNEL);
903 static void __init create_kernel_page_table(pgd_t *pgdir, bool early)
905 uintptr_t va, end_va;
907 end_va = kernel_map.virt_addr + kernel_map.size;
908 for (va = kernel_map.virt_addr; va < end_va; va += PMD_SIZE)
909 create_pgd_mapping(pgdir, va,
910 kernel_map.phys_addr + (va - kernel_map.virt_addr),
913 PAGE_KERNEL_EXEC : pgprot_from_va(va));
918 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
919 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
922 static void __init create_fdt_early_page_table(uintptr_t fix_fdt_va,
925 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
927 #ifndef CONFIG_BUILTIN_DTB
928 /* Make sure the fdt fixmap address is always aligned on PMD size */
929 BUILD_BUG_ON(FIX_FDT % (PMD_SIZE / PAGE_SIZE));
931 /* In 32-bit only, the fdt lies in its own PGD */
932 if (!IS_ENABLED(CONFIG_64BIT)) {
933 create_pgd_mapping(early_pg_dir, fix_fdt_va,
934 pa, MAX_FDT_SIZE, PAGE_KERNEL);
936 create_pmd_mapping(fixmap_pmd, fix_fdt_va,
937 pa, PMD_SIZE, PAGE_KERNEL);
938 create_pmd_mapping(fixmap_pmd, fix_fdt_va + PMD_SIZE,
939 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
942 dtb_early_va = (void *)fix_fdt_va + (dtb_pa & (PMD_SIZE - 1));
945 * For 64-bit kernel, __va can't be used since it would return a linear
946 * mapping address whereas dtb_early_va will be used before
947 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the
948 * kernel is mapped in the linear mapping, that makes no difference.
950 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));
953 dtb_early_pa = dtb_pa;
957 * MMU is not enabled, the page tables are allocated directly using
958 * early_pmd/pud/p4d and the address returned is the physical one.
960 static void __init pt_ops_set_early(void)
962 pt_ops.alloc_pte = alloc_pte_early;
963 pt_ops.get_pte_virt = get_pte_virt_early;
964 #ifndef __PAGETABLE_PMD_FOLDED
965 pt_ops.alloc_pmd = alloc_pmd_early;
966 pt_ops.get_pmd_virt = get_pmd_virt_early;
967 pt_ops.alloc_pud = alloc_pud_early;
968 pt_ops.get_pud_virt = get_pud_virt_early;
969 pt_ops.alloc_p4d = alloc_p4d_early;
970 pt_ops.get_p4d_virt = get_p4d_virt_early;
975 * MMU is enabled but page table setup is not complete yet.
976 * fixmap page table alloc functions must be used as a means to temporarily
977 * map the allocated physical pages since the linear mapping does not exist yet.
979 * Note that this is called with MMU disabled, hence kernel_mapping_pa_to_va,
980 * but it will be used as described above.
982 static void __init pt_ops_set_fixmap(void)
984 pt_ops.alloc_pte = kernel_mapping_pa_to_va(alloc_pte_fixmap);
985 pt_ops.get_pte_virt = kernel_mapping_pa_to_va(get_pte_virt_fixmap);
986 #ifndef __PAGETABLE_PMD_FOLDED
987 pt_ops.alloc_pmd = kernel_mapping_pa_to_va(alloc_pmd_fixmap);
988 pt_ops.get_pmd_virt = kernel_mapping_pa_to_va(get_pmd_virt_fixmap);
989 pt_ops.alloc_pud = kernel_mapping_pa_to_va(alloc_pud_fixmap);
990 pt_ops.get_pud_virt = kernel_mapping_pa_to_va(get_pud_virt_fixmap);
991 pt_ops.alloc_p4d = kernel_mapping_pa_to_va(alloc_p4d_fixmap);
992 pt_ops.get_p4d_virt = kernel_mapping_pa_to_va(get_p4d_virt_fixmap);
997 * MMU is enabled and page table setup is complete, so from now, we can use
998 * generic page allocation functions to setup page table.
1000 static void __init pt_ops_set_late(void)
1002 pt_ops.alloc_pte = alloc_pte_late;
1003 pt_ops.get_pte_virt = get_pte_virt_late;
1004 #ifndef __PAGETABLE_PMD_FOLDED
1005 pt_ops.alloc_pmd = alloc_pmd_late;
1006 pt_ops.get_pmd_virt = get_pmd_virt_late;
1007 pt_ops.alloc_pud = alloc_pud_late;
1008 pt_ops.get_pud_virt = get_pud_virt_late;
1009 pt_ops.alloc_p4d = alloc_p4d_late;
1010 pt_ops.get_p4d_virt = get_p4d_virt_late;
1014 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
1016 pmd_t __maybe_unused fix_bmap_spmd, fix_bmap_epmd;
1018 kernel_map.virt_addr = KERNEL_LINK_ADDR;
1019 kernel_map.page_offset = _AC(CONFIG_PAGE_OFFSET, UL);
1021 #ifdef CONFIG_XIP_KERNEL
1022 kernel_map.xiprom = (uintptr_t)CONFIG_XIP_PHYS_ADDR;
1023 kernel_map.xiprom_sz = (uintptr_t)(&_exiprom) - (uintptr_t)(&_xiprom);
1025 phys_ram_base = CONFIG_PHYS_RAM_BASE;
1026 kernel_map.phys_addr = (uintptr_t)CONFIG_PHYS_RAM_BASE;
1027 kernel_map.size = (uintptr_t)(&_end) - (uintptr_t)(&_sdata);
1029 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
1031 kernel_map.phys_addr = (uintptr_t)(&_start);
1032 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
1035 #if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
1036 set_satp_mode(dtb_pa);
1040 * In 64-bit, we defer the setup of va_pa_offset to setup_bootmem,
1041 * where we have the system memory layout: this allows us to align
1042 * the physical and virtual mappings and then make use of PUD/P4D/PGD
1043 * for the linear mapping. This is only possible because the kernel
1044 * mapping lies outside the linear mapping.
1045 * In 32-bit however, as the kernel resides in the linear mapping,
1046 * setup_vm_final can not change the mapping established here,
1047 * otherwise the same kernel addresses would get mapped to different
1048 * physical addresses (if the start of dram is different from the
1049 * kernel physical address start).
1051 kernel_map.va_pa_offset = IS_ENABLED(CONFIG_64BIT) ?
1052 0UL : PAGE_OFFSET - kernel_map.phys_addr;
1053 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
1056 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit
1057 * kernel, whereas for 64-bit kernel, the end of the virtual address
1058 * space is occupied by the modules/BPF/kernel mappings which reduces
1059 * the available size of the linear mapping.
1061 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0);
1063 /* Sanity check alignment and size */
1064 BUG_ON((PAGE_OFFSET % PGDIR_SIZE) != 0);
1065 BUG_ON((kernel_map.phys_addr % PMD_SIZE) != 0);
1069 * The last 4K bytes of the addressable memory can not be mapped because
1070 * of IS_ERR_VALUE macro.
1072 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
1075 #ifdef CONFIG_RELOCATABLE
1077 * Early page table uses only one PUD, which makes it possible
1078 * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset
1079 * makes the kernel cross over a PUD_SIZE boundary, raise a bug
1080 * since a part of the kernel would not get mapped.
1082 BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size);
1086 apply_early_boot_alternatives();
1089 /* Setup early PGD for fixmap */
1090 create_pgd_mapping(early_pg_dir, FIXADDR_START,
1091 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1093 #ifndef __PAGETABLE_PMD_FOLDED
1094 /* Setup fixmap P4D and PUD */
1095 if (pgtable_l5_enabled)
1096 create_p4d_mapping(fixmap_p4d, FIXADDR_START,
1097 (uintptr_t)fixmap_pud, P4D_SIZE, PAGE_TABLE);
1098 /* Setup fixmap PUD and PMD */
1099 if (pgtable_l4_enabled)
1100 create_pud_mapping(fixmap_pud, FIXADDR_START,
1101 (uintptr_t)fixmap_pmd, PUD_SIZE, PAGE_TABLE);
1102 create_pmd_mapping(fixmap_pmd, FIXADDR_START,
1103 (uintptr_t)fixmap_pte, PMD_SIZE, PAGE_TABLE);
1104 /* Setup trampoline PGD and PMD */
1105 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1106 trampoline_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1107 if (pgtable_l5_enabled)
1108 create_p4d_mapping(trampoline_p4d, kernel_map.virt_addr,
1109 (uintptr_t)trampoline_pud, P4D_SIZE, PAGE_TABLE);
1110 if (pgtable_l4_enabled)
1111 create_pud_mapping(trampoline_pud, kernel_map.virt_addr,
1112 (uintptr_t)trampoline_pmd, PUD_SIZE, PAGE_TABLE);
1113 #ifdef CONFIG_XIP_KERNEL
1114 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1115 kernel_map.xiprom, PMD_SIZE, PAGE_KERNEL_EXEC);
1117 create_pmd_mapping(trampoline_pmd, kernel_map.virt_addr,
1118 kernel_map.phys_addr, PMD_SIZE, PAGE_KERNEL_EXEC);
1121 /* Setup trampoline PGD */
1122 create_pgd_mapping(trampoline_pg_dir, kernel_map.virt_addr,
1123 kernel_map.phys_addr, PGDIR_SIZE, PAGE_KERNEL_EXEC);
1127 * Setup early PGD covering entire kernel which will allow
1128 * us to reach paging_init(). We map all memory banks later
1129 * in setup_vm_final() below.
1131 create_kernel_page_table(early_pg_dir, true);
1133 /* Setup early mapping for FDT early scan */
1134 create_fdt_early_page_table(__fix_to_virt(FIX_FDT), dtb_pa);
1137 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
1138 * range can not span multiple pmds.
1140 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
1141 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
1143 #ifndef __PAGETABLE_PMD_FOLDED
1145 * Early ioremap fixmap is already created as it lies within first 2MB
1146 * of fixmap region. We always map PMD_SIZE. Thus, both FIX_BTMAP_END
1147 * FIX_BTMAP_BEGIN should lie in the same pmd. Verify that and warn
1150 fix_bmap_spmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_BEGIN))];
1151 fix_bmap_epmd = fixmap_pmd[pmd_index(__fix_to_virt(FIX_BTMAP_END))];
1152 if (pmd_val(fix_bmap_spmd) != pmd_val(fix_bmap_epmd)) {
1154 pr_warn("fixmap btmap start [%08lx] != end [%08lx]\n",
1155 pmd_val(fix_bmap_spmd), pmd_val(fix_bmap_epmd));
1156 pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n",
1157 fix_to_virt(FIX_BTMAP_BEGIN));
1158 pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n",
1159 fix_to_virt(FIX_BTMAP_END));
1161 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
1162 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
1166 pt_ops_set_fixmap();
1169 static void __init create_linear_mapping_range(phys_addr_t start,
1173 uintptr_t va, map_size;
1175 for (pa = start; pa < end; pa += map_size) {
1176 va = (uintptr_t)__va(pa);
1177 map_size = best_map_size(pa, end - pa);
1179 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
1180 pgprot_from_va(va));
1184 static void __init create_linear_mapping_page_table(void)
1186 phys_addr_t start, end;
1189 #ifdef CONFIG_STRICT_KERNEL_RWX
1190 phys_addr_t ktext_start = __pa_symbol(_start);
1191 phys_addr_t ktext_size = __init_data_begin - _start;
1192 phys_addr_t krodata_start = __pa_symbol(__start_rodata);
1193 phys_addr_t krodata_size = _data - __start_rodata;
1195 /* Isolate kernel text and rodata so they don't get mapped with a PUD */
1196 memblock_mark_nomap(ktext_start, ktext_size);
1197 memblock_mark_nomap(krodata_start, krodata_size);
1200 /* Map all memory banks in the linear mapping */
1201 for_each_mem_range(i, &start, &end) {
1204 if (start <= __pa(PAGE_OFFSET) &&
1205 __pa(PAGE_OFFSET) < end)
1206 start = __pa(PAGE_OFFSET);
1207 if (end >= __pa(PAGE_OFFSET) + memory_limit)
1208 end = __pa(PAGE_OFFSET) + memory_limit;
1210 create_linear_mapping_range(start, end);
1213 #ifdef CONFIG_STRICT_KERNEL_RWX
1214 create_linear_mapping_range(ktext_start, ktext_start + ktext_size);
1215 create_linear_mapping_range(krodata_start,
1216 krodata_start + krodata_size);
1218 memblock_clear_nomap(ktext_start, ktext_size);
1219 memblock_clear_nomap(krodata_start, krodata_size);
1223 static void __init setup_vm_final(void)
1225 /* Setup swapper PGD for fixmap */
1226 #if !defined(CONFIG_64BIT)
1228 * In 32-bit, the device tree lies in a pgd entry, so it must be copied
1229 * directly in swapper_pg_dir in addition to the pgd entry that points
1232 unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT));
1234 set_pgd(&swapper_pg_dir[idx], early_pg_dir[idx]);
1236 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
1237 __pa_symbol(fixmap_pgd_next),
1238 PGDIR_SIZE, PAGE_TABLE);
1240 /* Map the linear mapping */
1241 create_linear_mapping_page_table();
1243 /* Map the kernel */
1244 if (IS_ENABLED(CONFIG_64BIT))
1245 create_kernel_page_table(swapper_pg_dir, false);
1248 kasan_swapper_init();
1251 /* Clear fixmap PTE and PMD mappings */
1252 clear_fixmap(FIX_PTE);
1253 clear_fixmap(FIX_PMD);
1254 clear_fixmap(FIX_PUD);
1255 clear_fixmap(FIX_P4D);
1257 /* Move to swapper page table */
1258 csr_write(CSR_SATP, PFN_DOWN(__pa_symbol(swapper_pg_dir)) | satp_mode);
1259 local_flush_tlb_all();
1264 asmlinkage void __init setup_vm(uintptr_t dtb_pa)
1266 dtb_early_va = (void *)dtb_pa;
1267 dtb_early_pa = dtb_pa;
1270 static inline void setup_vm_final(void)
1273 #endif /* CONFIG_MMU */
1276 * reserve_crashkernel() - reserves memory for crash kernel
1278 * This function reserves memory area given in "crashkernel=" kernel command
1279 * line parameter. The memory reserved is used by dump capture kernel when
1280 * primary kernel is crashing.
1282 static void __init reserve_crashkernel(void)
1284 unsigned long long crash_base = 0;
1285 unsigned long long crash_size = 0;
1286 unsigned long search_start = memblock_start_of_DRAM();
1287 unsigned long search_end = memblock_end_of_DRAM();
1291 if (!IS_ENABLED(CONFIG_KEXEC_CORE))
1294 * Don't reserve a region for a crash kernel on a crash kernel
1295 * since it doesn't make much sense and we have limited memory
1298 if (is_kdump_kernel()) {
1299 pr_info("crashkernel: ignoring reservation request\n");
1303 ret = parse_crashkernel(boot_command_line, memblock_phys_mem_size(),
1304 &crash_size, &crash_base);
1305 if (ret || !crash_size)
1308 crash_size = PAGE_ALIGN(crash_size);
1311 search_start = crash_base;
1312 search_end = crash_base + crash_size;
1316 * Current riscv boot protocol requires 2MB alignment for
1317 * RV64 and 4MB alignment for RV32 (hugepage size)
1319 * Try to alloc from 32bit addressible physical memory so that
1320 * swiotlb can work on the crash kernel.
1322 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
1324 min(search_end, (unsigned long) SZ_4G));
1325 if (crash_base == 0) {
1326 /* Try again without restricting region to 32bit addressible memory */
1327 crash_base = memblock_phys_alloc_range(crash_size, PMD_SIZE,
1328 search_start, search_end);
1329 if (crash_base == 0) {
1330 pr_warn("crashkernel: couldn't allocate %lldKB\n",
1336 pr_info("crashkernel: reserved 0x%016llx - 0x%016llx (%lld MB)\n",
1337 crash_base, crash_base + crash_size, crash_size >> 20);
1339 crashk_res.start = crash_base;
1340 crashk_res.end = crash_base + crash_size - 1;
1343 void __init paging_init(void)
1349 void __init misc_mem_init(void)
1351 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
1355 reserve_crashkernel();
1356 memblock_dump_all();
1359 #ifdef CONFIG_SPARSEMEM_VMEMMAP
1360 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
1361 struct vmem_altmap *altmap)
1363 return vmemmap_populate_basepages(start, end, node, NULL);