init.c (38c87827ffd3c7e1dd61eee9a7dea13d487dc2ed) init.c (26e7aacb83dfd04330673c5c9ac336560da52bb3)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Regents of the University of California
4 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
5 * Copyright (C) 2020 FORTH-ICS/CARV
6 * Nick Kossifidis <mick@ics.forth.gr>
7 */
8

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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>
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2012 Regents of the University of California
4 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
5 * Copyright (C) 2020 FORTH-ICS/CARV
6 * Nick Kossifidis <mick@ics.forth.gr>
7 */
8

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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>
25#endif
23
24#include <asm/fixmap.h>
25#include <asm/tlbflush.h>
26#include <asm/sections.h>
27#include <asm/soc.h>
28#include <asm/io.h>
29#include <asm/ptdump.h>
30#include <asm/numa.h>

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52phys_addr_t phys_ram_base __ro_after_init;
53EXPORT_SYMBOL(phys_ram_base);
54
55unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
56 __page_aligned_bss;
57EXPORT_SYMBOL(empty_zero_page);
58
59extern char _start[];
26
27#include <asm/fixmap.h>
28#include <asm/tlbflush.h>
29#include <asm/sections.h>
30#include <asm/soc.h>
31#include <asm/io.h>
32#include <asm/ptdump.h>
33#include <asm/numa.h>

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55phys_addr_t phys_ram_base __ro_after_init;
56EXPORT_SYMBOL(phys_ram_base);
57
58unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)]
59 __page_aligned_bss;
60EXPORT_SYMBOL(empty_zero_page);
61
62extern char _start[];
63#define DTB_EARLY_BASE_VA (ADDRESS_SPACE_END - (PTRS_PER_PGD / 2 * PGDIR_SIZE) + 1)
60void *_dtb_early_va __initdata;
61uintptr_t _dtb_early_pa __initdata;
62
63static phys_addr_t dma32_phys_limit __initdata;
64
65static void __init zone_sizes_init(void)
66{
67 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };

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140#endif
141 print_ml("lowmem", (unsigned long)PAGE_OFFSET,
142 (unsigned long)high_memory);
143 if (IS_ENABLED(CONFIG_64BIT)) {
144#ifdef CONFIG_KASAN
145 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END);
146#endif
147
64void *_dtb_early_va __initdata;
65uintptr_t _dtb_early_pa __initdata;
66
67static phys_addr_t dma32_phys_limit __initdata;
68
69static void __init zone_sizes_init(void)
70{
71 unsigned long max_zone_pfns[MAX_NR_ZONES] = { 0, };

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144#endif
145 print_ml("lowmem", (unsigned long)PAGE_OFFSET,
146 (unsigned long)high_memory);
147 if (IS_ENABLED(CONFIG_64BIT)) {
148#ifdef CONFIG_KASAN
149 print_ml("kasan", KASAN_SHADOW_START, KASAN_SHADOW_END);
150#endif
151
148 print_ml("kernel", (unsigned long)KERNEL_LINK_ADDR,
152 print_ml("kernel", (unsigned long)kernel_map.virt_addr,
149 (unsigned long)ADDRESS_SPACE_END);
150 }
151}
152#else
153static void print_vm_layout(void) { }
154#endif /* CONFIG_DEBUG_VM */
155
156void __init mem_init(void)

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207 /*
208 * Reserve from the start of the kernel to the end of the kernel
209 */
210 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
211
212 phys_ram_end = memblock_end_of_DRAM();
213 if (!IS_ENABLED(CONFIG_XIP_KERNEL))
214 phys_ram_base = memblock_start_of_DRAM();
153 (unsigned long)ADDRESS_SPACE_END);
154 }
155}
156#else
157static void print_vm_layout(void) { }
158#endif /* CONFIG_DEBUG_VM */
159
160void __init mem_init(void)

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211 /*
212 * Reserve from the start of the kernel to the end of the kernel
213 */
214 memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start);
215
216 phys_ram_end = memblock_end_of_DRAM();
217 if (!IS_ENABLED(CONFIG_XIP_KERNEL))
218 phys_ram_base = memblock_start_of_DRAM();
219
215 /*
220 /*
221 * In 64-bit, any use of __va/__pa before this point is wrong as we
222 * did not know the start of DRAM before.
223 */
224 if (IS_ENABLED(CONFIG_64BIT))
225 kernel_map.va_pa_offset = PAGE_OFFSET - phys_ram_base;
226
227 /*
216 * memblock allocator is not aware of the fact that last 4K bytes of
217 * the addressable memory can not be mapped because of IS_ERR_VALUE
218 * macro. Make sure that last 4k bytes are not usable by memblock
219 * if end of dram is equal to maximum addressable memory. For 64-bit
220 * kernel, this problem can't happen here as the end of the virtual
221 * address space is occupied by the kernel mapping then this check must
222 * be done as soon as the kernel mapping base address is determined.
223 */

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230 min_low_pfn = PFN_UP(phys_ram_base);
231 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
232 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
233
234 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
235 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
236
237 reserve_initrd_mem();
228 * memblock allocator is not aware of the fact that last 4K bytes of
229 * the addressable memory can not be mapped because of IS_ERR_VALUE
230 * macro. Make sure that last 4k bytes are not usable by memblock
231 * if end of dram is equal to maximum addressable memory. For 64-bit
232 * kernel, this problem can't happen here as the end of the virtual
233 * address space is occupied by the kernel mapping then this check must
234 * be done as soon as the kernel mapping base address is determined.
235 */

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242 min_low_pfn = PFN_UP(phys_ram_base);
243 max_low_pfn = max_pfn = PFN_DOWN(phys_ram_end);
244 high_memory = (void *)(__va(PFN_PHYS(max_low_pfn)));
245
246 dma32_phys_limit = min(4UL * SZ_1G, (unsigned long)PFN_PHYS(max_low_pfn));
247 set_max_mapnr(max_low_pfn - ARCH_PFN_OFFSET);
248
249 reserve_initrd_mem();
238
239 /*
250 /*
240 * No allocation should be done before reserving the memory as defined
241 * in the device tree, otherwise the allocation could end up in a
242 * reserved region.
243 */
244 early_init_fdt_scan_reserved_mem();
245
246 /*
247 * If DTB is built in, no need to reserve its memblock.
248 * Otherwise, do reserve it but avoid using
249 * early_init_fdt_reserve_self() since __pa() does
250 * not work for DTB pointers that are fixmap addresses
251 */
251 * If DTB is built in, no need to reserve its memblock.
252 * Otherwise, do reserve it but avoid using
253 * early_init_fdt_reserve_self() since __pa() does
254 * not work for DTB pointers that are fixmap addresses
255 */
252 if (!IS_ENABLED(CONFIG_BUILTIN_DTB))
253 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
256 if (!IS_ENABLED(CONFIG_BUILTIN_DTB)) {
257 /*
258 * In case the DTB is not located in a memory region we won't
259 * be able to locate it later on via the linear mapping and
260 * get a segfault when accessing it via __va(dtb_early_pa).
261 * To avoid this situation copy DTB to a memory region.
262 * Note that memblock_phys_alloc will also reserve DTB region.
263 */
264 if (!memblock_is_memory(dtb_early_pa)) {
265 size_t fdt_size = fdt_totalsize(dtb_early_va);
266 phys_addr_t new_dtb_early_pa = memblock_phys_alloc(fdt_size, PAGE_SIZE);
267 void *new_dtb_early_va = early_memremap(new_dtb_early_pa, fdt_size);
254
268
269 memcpy(new_dtb_early_va, dtb_early_va, fdt_size);
270 early_memunmap(new_dtb_early_va, fdt_size);
271 _dtb_early_pa = new_dtb_early_pa;
272 } else
273 memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
274 }
275
255 dma_contiguous_reserve(dma32_phys_limit);
256 if (IS_ENABLED(CONFIG_64BIT))
257 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
258 memblock_allow_resize();
259}
260
261#ifdef CONFIG_MMU
262struct pt_alloc_ops pt_ops __initdata;
263
276 dma_contiguous_reserve(dma32_phys_limit);
277 if (IS_ENABLED(CONFIG_64BIT))
278 hugetlb_cma_reserve(PUD_SHIFT - PAGE_SHIFT);
279 memblock_allow_resize();
280}
281
282#ifdef CONFIG_MMU
283struct pt_alloc_ops pt_ops __initdata;
284
264unsigned long riscv_pfn_base __ro_after_init;
265EXPORT_SYMBOL(riscv_pfn_base);
266
267pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
268pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
269static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
270
271pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
285pgd_t swapper_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
286pgd_t trampoline_pg_dir[PTRS_PER_PGD] __page_aligned_bss;
287static pte_t fixmap_pte[PTRS_PER_PTE] __page_aligned_bss;
288
289pgd_t early_pg_dir[PTRS_PER_PGD] __initdata __aligned(PAGE_SIZE);
290static p4d_t __maybe_unused early_dtb_p4d[PTRS_PER_P4D] __initdata __aligned(PAGE_SIZE);
291static pud_t __maybe_unused early_dtb_pud[PTRS_PER_PUD] __initdata __aligned(PAGE_SIZE);
292static pmd_t __maybe_unused early_dtb_pmd[PTRS_PER_PMD] __initdata __aligned(PAGE_SIZE);
272
273#ifdef CONFIG_XIP_KERNEL
274#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
293
294#ifdef CONFIG_XIP_KERNEL
295#define pt_ops (*(struct pt_alloc_ops *)XIP_FIXUP(&pt_ops))
275#define riscv_pfn_base (*(unsigned long *)XIP_FIXUP(&riscv_pfn_base))
276#define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
277#define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
278#define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
279#endif /* CONFIG_XIP_KERNEL */
280
281static const pgprot_t protection_map[16] = {
282 [VM_NONE] = PAGE_NONE,
283 [VM_READ] = PAGE_READ,

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608 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \
609 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot)))
610#define fixmap_pgd_next (pgtable_l5_enabled ? \
611 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \
612 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd))
613#define trampoline_pgd_next (pgtable_l5_enabled ? \
614 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \
615 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd))
296#define trampoline_pg_dir ((pgd_t *)XIP_FIXUP(trampoline_pg_dir))
297#define fixmap_pte ((pte_t *)XIP_FIXUP(fixmap_pte))
298#define early_pg_dir ((pgd_t *)XIP_FIXUP(early_pg_dir))
299#endif /* CONFIG_XIP_KERNEL */
300
301static const pgprot_t protection_map[16] = {
302 [VM_NONE] = PAGE_NONE,
303 [VM_READ] = PAGE_READ,

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628 create_pud_mapping((pud_t *)__nextp, __va, __pa, __sz, __prot) : \
629 create_pmd_mapping((pmd_t *)__nextp, __va, __pa, __sz, __prot)))
630#define fixmap_pgd_next (pgtable_l5_enabled ? \
631 (uintptr_t)fixmap_p4d : (pgtable_l4_enabled ? \
632 (uintptr_t)fixmap_pud : (uintptr_t)fixmap_pmd))
633#define trampoline_pgd_next (pgtable_l5_enabled ? \
634 (uintptr_t)trampoline_p4d : (pgtable_l4_enabled ? \
635 (uintptr_t)trampoline_pud : (uintptr_t)trampoline_pmd))
636#define early_dtb_pgd_next (pgtable_l5_enabled ? \
637 (uintptr_t)early_dtb_p4d : (pgtable_l4_enabled ? \
638 (uintptr_t)early_dtb_pud : (uintptr_t)early_dtb_pmd))
616#else
617#define pgd_next_t pte_t
618#define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
619#define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
620#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
621 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
622#define fixmap_pgd_next ((uintptr_t)fixmap_pte)
639#else
640#define pgd_next_t pte_t
641#define alloc_pgd_next(__va) pt_ops.alloc_pte(__va)
642#define get_pgd_next_virt(__pa) pt_ops.get_pte_virt(__pa)
643#define create_pgd_next_mapping(__nextp, __va, __pa, __sz, __prot) \
644 create_pte_mapping(__nextp, __va, __pa, __sz, __prot)
645#define fixmap_pgd_next ((uintptr_t)fixmap_pte)
646#define early_dtb_pgd_next ((uintptr_t)early_dtb_pmd)
623#define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
624#define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
625#define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
626#endif /* __PAGETABLE_PMD_FOLDED */
627
628void __init create_pgd_mapping(pgd_t *pgdp,
629 uintptr_t va, phys_addr_t pa,
630 phys_addr_t sz, pgprot_t prot)

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649 nextp = get_pgd_next_virt(next_phys);
650 }
651
652 create_pgd_next_mapping(nextp, va, pa, sz, prot);
653}
654
655static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
656{
647#define create_p4d_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
648#define create_pud_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
649#define create_pmd_mapping(__pmdp, __va, __pa, __sz, __prot) do {} while(0)
650#endif /* __PAGETABLE_PMD_FOLDED */
651
652void __init create_pgd_mapping(pgd_t *pgdp,
653 uintptr_t va, phys_addr_t pa,
654 phys_addr_t sz, pgprot_t prot)

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673 nextp = get_pgd_next_virt(next_phys);
674 }
675
676 create_pgd_next_mapping(nextp, va, pa, sz, prot);
677}
678
679static uintptr_t __init best_map_size(phys_addr_t base, phys_addr_t size)
680{
657 /* Upgrade to PMD_SIZE mappings whenever possible */
658 base &= PMD_SIZE - 1;
659 if (!base && size >= PMD_SIZE)
681 if (!(base & (PGDIR_SIZE - 1)) && size >= PGDIR_SIZE)
682 return PGDIR_SIZE;
683
684 if (!(base & (P4D_SIZE - 1)) && size >= P4D_SIZE)
685 return P4D_SIZE;
686
687 if (!(base & (PUD_SIZE - 1)) && size >= PUD_SIZE)
688 return PUD_SIZE;
689
690 if (!(base & (PMD_SIZE - 1)) && size >= PMD_SIZE)
660 return PMD_SIZE;
661
662 return PAGE_SIZE;
663}
664
665#ifdef CONFIG_XIP_KERNEL
666#define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base))
667extern char _xiprom[], _exiprom[], __data_loc;

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710 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
711 return PAGE_KERNEL;
712
713 return PAGE_KERNEL_EXEC;
714}
715#endif /* CONFIG_STRICT_KERNEL_RWX */
716
717#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
691 return PMD_SIZE;
692
693 return PAGE_SIZE;
694}
695
696#ifdef CONFIG_XIP_KERNEL
697#define phys_ram_base (*(phys_addr_t *)XIP_FIXUP(&phys_ram_base))
698extern char _xiprom[], _exiprom[], __data_loc;

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741 if (IS_ENABLED(CONFIG_64BIT) && !is_kernel_mapping(va))
742 return PAGE_KERNEL;
743
744 return PAGE_KERNEL_EXEC;
745}
746#endif /* CONFIG_STRICT_KERNEL_RWX */
747
748#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
749u64 __pi_set_satp_mode_from_cmdline(uintptr_t dtb_pa);
750
718static void __init disable_pgtable_l5(void)
719{
720 pgtable_l5_enabled = false;
721 kernel_map.page_offset = PAGE_OFFSET_L4;
722 satp_mode = SATP_MODE_48;
723}
724
725static void __init disable_pgtable_l4(void)
726{
727 pgtable_l4_enabled = false;
728 kernel_map.page_offset = PAGE_OFFSET_L3;
729 satp_mode = SATP_MODE_39;
730}
731
751static void __init disable_pgtable_l5(void)
752{
753 pgtable_l5_enabled = false;
754 kernel_map.page_offset = PAGE_OFFSET_L4;
755 satp_mode = SATP_MODE_48;
756}
757
758static void __init disable_pgtable_l4(void)
759{
760 pgtable_l4_enabled = false;
761 kernel_map.page_offset = PAGE_OFFSET_L3;
762 satp_mode = SATP_MODE_39;
763}
764
765static int __init print_no4lvl(char *p)
766{
767 pr_info("Disabled 4-level and 5-level paging");
768 return 0;
769}
770early_param("no4lvl", print_no4lvl);
771
772static int __init print_no5lvl(char *p)
773{
774 pr_info("Disabled 5-level paging");
775 return 0;
776}
777early_param("no5lvl", print_no5lvl);
778
732/*
733 * There is a simple way to determine if 4-level is supported by the
734 * underlying hardware: establish 1:1 mapping in 4-level page table mode
735 * then read SATP to see if the configuration was taken into account
736 * meaning sv48 is supported.
737 */
779/*
780 * There is a simple way to determine if 4-level is supported by the
781 * underlying hardware: establish 1:1 mapping in 4-level page table mode
782 * then read SATP to see if the configuration was taken into account
783 * meaning sv48 is supported.
784 */
738static __init void set_satp_mode(void)
785static __init void set_satp_mode(uintptr_t dtb_pa)
739{
740 u64 identity_satp, hw_satp;
741 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK;
786{
787 u64 identity_satp, hw_satp;
788 uintptr_t set_satp_mode_pmd = ((unsigned long)set_satp_mode) & PMD_MASK;
742 bool check_l4 = false;
789 u64 satp_mode_cmdline = __pi_set_satp_mode_from_cmdline(dtb_pa);
743
790
791 if (satp_mode_cmdline == SATP_MODE_57) {
792 disable_pgtable_l5();
793 } else if (satp_mode_cmdline == SATP_MODE_48) {
794 disable_pgtable_l5();
795 disable_pgtable_l4();
796 return;
797 }
798
744 create_p4d_mapping(early_p4d,
745 set_satp_mode_pmd, (uintptr_t)early_pud,
746 P4D_SIZE, PAGE_TABLE);
747 create_pud_mapping(early_pud,
748 set_satp_mode_pmd, (uintptr_t)early_pmd,
749 PUD_SIZE, PAGE_TABLE);
750 /* Handle the case where set_satp_mode straddles 2 PMDs */
751 create_pmd_mapping(early_pmd,
752 set_satp_mode_pmd, set_satp_mode_pmd,
753 PMD_SIZE, PAGE_KERNEL_EXEC);
754 create_pmd_mapping(early_pmd,
755 set_satp_mode_pmd + PMD_SIZE,
756 set_satp_mode_pmd + PMD_SIZE,
757 PMD_SIZE, PAGE_KERNEL_EXEC);
758retry:
759 create_pgd_mapping(early_pg_dir,
760 set_satp_mode_pmd,
799 create_p4d_mapping(early_p4d,
800 set_satp_mode_pmd, (uintptr_t)early_pud,
801 P4D_SIZE, PAGE_TABLE);
802 create_pud_mapping(early_pud,
803 set_satp_mode_pmd, (uintptr_t)early_pmd,
804 PUD_SIZE, PAGE_TABLE);
805 /* Handle the case where set_satp_mode straddles 2 PMDs */
806 create_pmd_mapping(early_pmd,
807 set_satp_mode_pmd, set_satp_mode_pmd,
808 PMD_SIZE, PAGE_KERNEL_EXEC);
809 create_pmd_mapping(early_pmd,
810 set_satp_mode_pmd + PMD_SIZE,
811 set_satp_mode_pmd + PMD_SIZE,
812 PMD_SIZE, PAGE_KERNEL_EXEC);
813retry:
814 create_pgd_mapping(early_pg_dir,
815 set_satp_mode_pmd,
761 check_l4 ? (uintptr_t)early_pud : (uintptr_t)early_p4d,
816 pgtable_l5_enabled ?
817 (uintptr_t)early_p4d : (uintptr_t)early_pud,
762 PGDIR_SIZE, PAGE_TABLE);
763
764 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode;
765
766 local_flush_tlb_all();
767 csr_write(CSR_SATP, identity_satp);
768 hw_satp = csr_swap(CSR_SATP, 0ULL);
769 local_flush_tlb_all();
770
771 if (hw_satp != identity_satp) {
818 PGDIR_SIZE, PAGE_TABLE);
819
820 identity_satp = PFN_DOWN((uintptr_t)&early_pg_dir) | satp_mode;
821
822 local_flush_tlb_all();
823 csr_write(CSR_SATP, identity_satp);
824 hw_satp = csr_swap(CSR_SATP, 0ULL);
825 local_flush_tlb_all();
826
827 if (hw_satp != identity_satp) {
772 if (!check_l4) {
828 if (pgtable_l5_enabled) {
773 disable_pgtable_l5();
829 disable_pgtable_l5();
774 check_l4 = true;
775 memset(early_pg_dir, 0, PAGE_SIZE);
776 goto retry;
777 }
778 disable_pgtable_l4();
779 }
780
781 memset(early_pg_dir, 0, PAGE_SIZE);
782 memset(early_p4d, 0, PAGE_SIZE);

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798 * Currently, the above requirements are honoured by using custom CFLAGS
799 * for init.o in mm/Makefile.
800 */
801
802#ifndef __riscv_cmodel_medany
803#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
804#endif
805
830 memset(early_pg_dir, 0, PAGE_SIZE);
831 goto retry;
832 }
833 disable_pgtable_l4();
834 }
835
836 memset(early_pg_dir, 0, PAGE_SIZE);
837 memset(early_p4d, 0, PAGE_SIZE);

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853 * Currently, the above requirements are honoured by using custom CFLAGS
854 * for init.o in mm/Makefile.
855 */
856
857#ifndef __riscv_cmodel_medany
858#error "setup_vm() is called from head.S before relocate so it should not use absolute addressing."
859#endif
860
861#ifdef CONFIG_RELOCATABLE
862extern unsigned long __rela_dyn_start, __rela_dyn_end;
863
864static void __init relocate_kernel(void)
865{
866 Elf64_Rela *rela = (Elf64_Rela *)&__rela_dyn_start;
867 /*
868 * This holds the offset between the linked virtual address and the
869 * relocated virtual address.
870 */
871 uintptr_t reloc_offset = kernel_map.virt_addr - KERNEL_LINK_ADDR;
872 /*
873 * This holds the offset between kernel linked virtual address and
874 * physical address.
875 */
876 uintptr_t va_kernel_link_pa_offset = KERNEL_LINK_ADDR - kernel_map.phys_addr;
877
878 for ( ; rela < (Elf64_Rela *)&__rela_dyn_end; rela++) {
879 Elf64_Addr addr = (rela->r_offset - va_kernel_link_pa_offset);
880 Elf64_Addr relocated_addr = rela->r_addend;
881
882 if (rela->r_info != R_RISCV_RELATIVE)
883 continue;
884
885 /*
886 * Make sure to not relocate vdso symbols like rt_sigreturn
887 * which are linked from the address 0 in vmlinux since
888 * vdso symbol addresses are actually used as an offset from
889 * mm->context.vdso in VDSO_OFFSET macro.
890 */
891 if (relocated_addr >= KERNEL_LINK_ADDR)
892 relocated_addr += reloc_offset;
893
894 *(Elf64_Addr *)addr = relocated_addr;
895 }
896}
897#endif /* CONFIG_RELOCATABLE */
898
806#ifdef CONFIG_XIP_KERNEL
807static void __init create_kernel_page_table(pgd_t *pgdir,
808 __always_unused bool early)
809{
810 uintptr_t va, end_va;
811
812 /* Map the flash resident part */
813 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;

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838}
839#endif
840
841/*
842 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
843 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
844 * entry.
845 */
899#ifdef CONFIG_XIP_KERNEL
900static void __init create_kernel_page_table(pgd_t *pgdir,
901 __always_unused bool early)
902{
903 uintptr_t va, end_va;
904
905 /* Map the flash resident part */
906 end_va = kernel_map.virt_addr + kernel_map.xiprom_sz;

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931}
932#endif
933
934/*
935 * Setup a 4MB mapping that encompasses the device tree: for 64-bit kernel,
936 * this means 2 PMD entries whereas for 32-bit kernel, this is only 1 PGDIR
937 * entry.
938 */
846static void __init create_fdt_early_page_table(pgd_t *pgdir,
847 uintptr_t fix_fdt_va,
848 uintptr_t dtb_pa)
939static void __init create_fdt_early_page_table(pgd_t *pgdir, uintptr_t dtb_pa)
849{
940{
941#ifndef CONFIG_BUILTIN_DTB
850 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
851
942 uintptr_t pa = dtb_pa & ~(PMD_SIZE - 1);
943
852#ifndef CONFIG_BUILTIN_DTB
853 /* Make sure the fdt fixmap address is always aligned on PMD size */
854 BUILD_BUG_ON(FIX_FDT % (PMD_SIZE / PAGE_SIZE));
944 create_pgd_mapping(early_pg_dir, DTB_EARLY_BASE_VA,
945 IS_ENABLED(CONFIG_64BIT) ? early_dtb_pgd_next : pa,
946 PGDIR_SIZE,
947 IS_ENABLED(CONFIG_64BIT) ? PAGE_TABLE : PAGE_KERNEL);
855
948
856 /* In 32-bit only, the fdt lies in its own PGD */
857 if (!IS_ENABLED(CONFIG_64BIT)) {
858 create_pgd_mapping(early_pg_dir, fix_fdt_va,
859 pa, MAX_FDT_SIZE, PAGE_KERNEL);
860 } else {
861 create_pmd_mapping(fixmap_pmd, fix_fdt_va,
949 if (pgtable_l5_enabled)
950 create_p4d_mapping(early_dtb_p4d, DTB_EARLY_BASE_VA,
951 (uintptr_t)early_dtb_pud, P4D_SIZE, PAGE_TABLE);
952
953 if (pgtable_l4_enabled)
954 create_pud_mapping(early_dtb_pud, DTB_EARLY_BASE_VA,
955 (uintptr_t)early_dtb_pmd, PUD_SIZE, PAGE_TABLE);
956
957 if (IS_ENABLED(CONFIG_64BIT)) {
958 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA,
862 pa, PMD_SIZE, PAGE_KERNEL);
959 pa, PMD_SIZE, PAGE_KERNEL);
863 create_pmd_mapping(fixmap_pmd, fix_fdt_va + PMD_SIZE,
960 create_pmd_mapping(early_dtb_pmd, DTB_EARLY_BASE_VA + PMD_SIZE,
864 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
865 }
866
961 pa + PMD_SIZE, PMD_SIZE, PAGE_KERNEL);
962 }
963
867 dtb_early_va = (void *)fix_fdt_va + (dtb_pa & (PMD_SIZE - 1));
964 dtb_early_va = (void *)DTB_EARLY_BASE_VA + (dtb_pa & (PMD_SIZE - 1));
868#else
869 /*
870 * For 64-bit kernel, __va can't be used since it would return a linear
871 * mapping address whereas dtb_early_va will be used before
872 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the
873 * kernel is mapped in the linear mapping, that makes no difference.
874 */
875 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));

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953
954 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
955#else
956 kernel_map.phys_addr = (uintptr_t)(&_start);
957 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
958#endif
959
960#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
965#else
966 /*
967 * For 64-bit kernel, __va can't be used since it would return a linear
968 * mapping address whereas dtb_early_va will be used before
969 * setup_vm_final installs the linear mapping. For 32-bit kernel, as the
970 * kernel is mapped in the linear mapping, that makes no difference.
971 */
972 dtb_early_va = kernel_mapping_pa_to_va(XIP_FIXUP(dtb_pa));

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1050
1051 kernel_map.va_kernel_xip_pa_offset = kernel_map.virt_addr - kernel_map.xiprom;
1052#else
1053 kernel_map.phys_addr = (uintptr_t)(&_start);
1054 kernel_map.size = (uintptr_t)(&_end) - kernel_map.phys_addr;
1055#endif
1056
1057#if defined(CONFIG_64BIT) && !defined(CONFIG_XIP_KERNEL)
961 set_satp_mode();
1058 set_satp_mode(dtb_pa);
962#endif
963
1059#endif
1060
964 kernel_map.va_pa_offset = PAGE_OFFSET - kernel_map.phys_addr;
1061 /*
1062 * In 64-bit, we defer the setup of va_pa_offset to setup_bootmem,
1063 * where we have the system memory layout: this allows us to align
1064 * the physical and virtual mappings and then make use of PUD/P4D/PGD
1065 * for the linear mapping. This is only possible because the kernel
1066 * mapping lies outside the linear mapping.
1067 * In 32-bit however, as the kernel resides in the linear mapping,
1068 * setup_vm_final can not change the mapping established here,
1069 * otherwise the same kernel addresses would get mapped to different
1070 * physical addresses (if the start of dram is different from the
1071 * kernel physical address start).
1072 */
1073 kernel_map.va_pa_offset = IS_ENABLED(CONFIG_64BIT) ?
1074 0UL : PAGE_OFFSET - kernel_map.phys_addr;
965 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
966
1075 kernel_map.va_kernel_pa_offset = kernel_map.virt_addr - kernel_map.phys_addr;
1076
967 riscv_pfn_base = PFN_DOWN(kernel_map.phys_addr);
968
969 /*
970 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit
971 * kernel, whereas for 64-bit kernel, the end of the virtual address
972 * space is occupied by the modules/BPF/kernel mappings which reduces
973 * the available size of the linear mapping.
974 */
975 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0);
976

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981#ifdef CONFIG_64BIT
982 /*
983 * The last 4K bytes of the addressable memory can not be mapped because
984 * of IS_ERR_VALUE macro.
985 */
986 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
987#endif
988
1077 /*
1078 * The default maximal physical memory size is KERN_VIRT_SIZE for 32-bit
1079 * kernel, whereas for 64-bit kernel, the end of the virtual address
1080 * space is occupied by the modules/BPF/kernel mappings which reduces
1081 * the available size of the linear mapping.
1082 */
1083 memory_limit = KERN_VIRT_SIZE - (IS_ENABLED(CONFIG_64BIT) ? SZ_4G : 0);
1084

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1089#ifdef CONFIG_64BIT
1090 /*
1091 * The last 4K bytes of the addressable memory can not be mapped because
1092 * of IS_ERR_VALUE macro.
1093 */
1094 BUG_ON((kernel_map.virt_addr + kernel_map.size) > ADDRESS_SPACE_END - SZ_4K);
1095#endif
1096
1097#ifdef CONFIG_RELOCATABLE
1098 /*
1099 * Early page table uses only one PUD, which makes it possible
1100 * to map PUD_SIZE aligned on PUD_SIZE: if the relocation offset
1101 * makes the kernel cross over a PUD_SIZE boundary, raise a bug
1102 * since a part of the kernel would not get mapped.
1103 */
1104 BUG_ON(PUD_SIZE - (kernel_map.virt_addr & (PUD_SIZE - 1)) < kernel_map.size);
1105 relocate_kernel();
1106#endif
1107
989 apply_early_boot_alternatives();
990 pt_ops_set_early();
991
992 /* Setup early PGD for fixmap */
993 create_pgd_mapping(early_pg_dir, FIXADDR_START,
994 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
995
996#ifndef __PAGETABLE_PMD_FOLDED

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1029 /*
1030 * Setup early PGD covering entire kernel which will allow
1031 * us to reach paging_init(). We map all memory banks later
1032 * in setup_vm_final() below.
1033 */
1034 create_kernel_page_table(early_pg_dir, true);
1035
1036 /* Setup early mapping for FDT early scan */
1108 apply_early_boot_alternatives();
1109 pt_ops_set_early();
1110
1111 /* Setup early PGD for fixmap */
1112 create_pgd_mapping(early_pg_dir, FIXADDR_START,
1113 fixmap_pgd_next, PGDIR_SIZE, PAGE_TABLE);
1114
1115#ifndef __PAGETABLE_PMD_FOLDED

--- 32 unchanged lines hidden (view full) ---

1148 /*
1149 * Setup early PGD covering entire kernel which will allow
1150 * us to reach paging_init(). We map all memory banks later
1151 * in setup_vm_final() below.
1152 */
1153 create_kernel_page_table(early_pg_dir, true);
1154
1155 /* Setup early mapping for FDT early scan */
1037 create_fdt_early_page_table(early_pg_dir,
1038 __fix_to_virt(FIX_FDT), dtb_pa);
1156 create_fdt_early_page_table(early_pg_dir, dtb_pa);
1039
1040 /*
1041 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
1042 * range can not span multiple pmds.
1043 */
1044 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
1045 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
1046

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1065 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
1066 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
1067 }
1068#endif
1069
1070 pt_ops_set_fixmap();
1071}
1072
1157
1158 /*
1159 * Bootime fixmap only can handle PMD_SIZE mapping. Thus, boot-ioremap
1160 * range can not span multiple pmds.
1161 */
1162 BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT)
1163 != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT));
1164

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1183 pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END);
1184 pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN);
1185 }
1186#endif
1187
1188 pt_ops_set_fixmap();
1189}
1190
1073static void __init setup_vm_final(void)
1191static void __init create_linear_mapping_range(phys_addr_t start,
1192 phys_addr_t end)
1074{
1193{
1194 phys_addr_t pa;
1075 uintptr_t va, map_size;
1195 uintptr_t va, map_size;
1076 phys_addr_t pa, start, end;
1196
1197 for (pa = start; pa < end; pa += map_size) {
1198 va = (uintptr_t)__va(pa);
1199 map_size = best_map_size(pa, end - pa);
1200
1201 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
1202 pgprot_from_va(va));
1203 }
1204}
1205
1206static void __init create_linear_mapping_page_table(void)
1207{
1208 phys_addr_t start, end;
1077 u64 i;
1078
1209 u64 i;
1210
1079 /* Setup swapper PGD for fixmap */
1080#if !defined(CONFIG_64BIT)
1081 /*
1082 * In 32-bit, the device tree lies in a pgd entry, so it must be copied
1083 * directly in swapper_pg_dir in addition to the pgd entry that points
1084 * to fixmap_pte.
1085 */
1086 unsigned long idx = pgd_index(__fix_to_virt(FIX_FDT));
1211#ifdef CONFIG_STRICT_KERNEL_RWX
1212 phys_addr_t ktext_start = __pa_symbol(_start);
1213 phys_addr_t ktext_size = __init_data_begin - _start;
1214 phys_addr_t krodata_start = __pa_symbol(__start_rodata);
1215 phys_addr_t krodata_size = _data - __start_rodata;
1087
1216
1088 set_pgd(&swapper_pg_dir[idx], early_pg_dir[idx]);
1217 /* Isolate kernel text and rodata so they don't get mapped with a PUD */
1218 memblock_mark_nomap(ktext_start, ktext_size);
1219 memblock_mark_nomap(krodata_start, krodata_size);
1089#endif
1220#endif
1090 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
1091 __pa_symbol(fixmap_pgd_next),
1092 PGDIR_SIZE, PAGE_TABLE);
1093
1094 /* Map all memory banks in the linear mapping */
1095 for_each_mem_range(i, &start, &end) {
1096 if (start >= end)
1097 break;
1098 if (start <= __pa(PAGE_OFFSET) &&
1099 __pa(PAGE_OFFSET) < end)
1100 start = __pa(PAGE_OFFSET);
1101 if (end >= __pa(PAGE_OFFSET) + memory_limit)
1102 end = __pa(PAGE_OFFSET) + memory_limit;
1103
1221
1222 /* Map all memory banks in the linear mapping */
1223 for_each_mem_range(i, &start, &end) {
1224 if (start >= end)
1225 break;
1226 if (start <= __pa(PAGE_OFFSET) &&
1227 __pa(PAGE_OFFSET) < end)
1228 start = __pa(PAGE_OFFSET);
1229 if (end >= __pa(PAGE_OFFSET) + memory_limit)
1230 end = __pa(PAGE_OFFSET) + memory_limit;
1231
1104 for (pa = start; pa < end; pa += map_size) {
1105 va = (uintptr_t)__va(pa);
1106 map_size = best_map_size(pa, end - pa);
1107
1108 create_pgd_mapping(swapper_pg_dir, va, pa, map_size,
1109 pgprot_from_va(va));
1110 }
1232 create_linear_mapping_range(start, end);
1111 }
1112
1233 }
1234
1235#ifdef CONFIG_STRICT_KERNEL_RWX
1236 create_linear_mapping_range(ktext_start, ktext_start + ktext_size);
1237 create_linear_mapping_range(krodata_start,
1238 krodata_start + krodata_size);
1239
1240 memblock_clear_nomap(ktext_start, ktext_size);
1241 memblock_clear_nomap(krodata_start, krodata_size);
1242#endif
1243}
1244
1245static void __init setup_vm_final(void)
1246{
1247 /* Setup swapper PGD for fixmap */
1248 create_pgd_mapping(swapper_pg_dir, FIXADDR_START,
1249 __pa_symbol(fixmap_pgd_next),
1250 PGDIR_SIZE, PAGE_TABLE);
1251
1252 /* Map the linear mapping */
1253 create_linear_mapping_page_table();
1254
1113 /* Map the kernel */
1114 if (IS_ENABLED(CONFIG_64BIT))
1115 create_kernel_page_table(swapper_pg_dir, false);
1116
1117#ifdef CONFIG_KASAN
1118 kasan_swapper_init();
1119#endif
1120

--- 115 unchanged lines hidden --- 		1255 /* Map the kernel */
1256 if (IS_ENABLED(CONFIG_64BIT))
1257 create_kernel_page_table(swapper_pg_dir, false);
1258
1259#ifdef CONFIG_KASAN
1260 kasan_swapper_init();
1261#endif
1262

--- 115 unchanged lines hidden ---