mmu.c (e6128a8e523cfa8f46a1501e6432c37523b47bdf) mmu.c (84b04d3e6bdbc7551e62b75dd97cae4a8bddb1b6)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Based on arch/arm/mm/mmu.c
4 *
5 * Copyright (C) 1995-2005 Russell King
6 * Copyright (C) 2012 ARM Ltd.
7 */
8

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40#include <asm/tlbflush.h>
41#include <asm/pgalloc.h>
42#include <asm/kfence.h>
43
44#define NO_BLOCK_MAPPINGS BIT(0)
45#define NO_CONT_MAPPINGS BIT(1)
46#define NO_EXEC_MAPPINGS BIT(2) /* assumes FEAT_HPDS is not used */
47
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Based on arch/arm/mm/mmu.c
4 *
5 * Copyright (C) 1995-2005 Russell King
6 * Copyright (C) 2012 ARM Ltd.
7 */
8

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40#include <asm/tlbflush.h>
41#include <asm/pgalloc.h>
42#include <asm/kfence.h>
43
44#define NO_BLOCK_MAPPINGS BIT(0)
45#define NO_CONT_MAPPINGS BIT(1)
46#define NO_EXEC_MAPPINGS BIT(2) /* assumes FEAT_HPDS is not used */
47
48int idmap_t0sz __ro_after_init;
49
50#if VA_BITS > 48
51u64 vabits_actual __ro_after_init = VA_BITS_MIN;
52EXPORT_SYMBOL(vabits_actual);
53#endif
54
55u64 kimage_voffset __ro_after_init;
56EXPORT_SYMBOL(kimage_voffset);
57

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788 }
789}
790
791void __init paging_init(void)
792{
793 pgd_t *pgdp = pgd_set_fixmap(__pa_symbol(swapper_pg_dir));
794 extern pgd_t init_idmap_pg_dir[];
795
48#if VA_BITS > 48
49u64 vabits_actual __ro_after_init = VA_BITS_MIN;
50EXPORT_SYMBOL(vabits_actual);
51#endif
52
53u64 kimage_voffset __ro_after_init;
54EXPORT_SYMBOL(kimage_voffset);
55

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786 }
787}
788
789void __init paging_init(void)
790{
791 pgd_t *pgdp = pgd_set_fixmap(__pa_symbol(swapper_pg_dir));
792 extern pgd_t init_idmap_pg_dir[];
793
796 idmap_t0sz = 63UL - __fls(__pa_symbol(_end) | GENMASK(VA_BITS_MIN - 1, 0));
797
798 map_kernel(pgdp);
799 map_mem(pgdp);
800
801 pgd_clear_fixmap();
802
803 cpu_replace_ttbr1(lm_alias(swapper_pg_dir), init_idmap_pg_dir);
804 init_mm.pgd = swapper_pg_dir;
805
806 memblock_phys_free(__pa_symbol(init_pg_dir),
807 __pa_symbol(init_pg_end) - __pa_symbol(init_pg_dir));
808
809 memblock_allow_resize();
810
811 create_idmap();
794 map_kernel(pgdp);
795 map_mem(pgdp);
796
797 pgd_clear_fixmap();
798
799 cpu_replace_ttbr1(lm_alias(swapper_pg_dir), init_idmap_pg_dir);
800 init_mm.pgd = swapper_pg_dir;
801
802 memblock_phys_free(__pa_symbol(init_pg_dir),
803 __pa_symbol(init_pg_end) - __pa_symbol(init_pg_dir));
804
805 memblock_allow_resize();
806
807 create_idmap();
812 idmap_t0sz = TCR_T0SZ(IDMAP_VA_BITS);
813}
814
815#ifdef CONFIG_MEMORY_HOTPLUG
816static void free_hotplug_page_range(struct page *page, size_t size,
817 struct vmem_altmap *altmap)
818{
819 if (altmap) {
820 vmem_altmap_free(altmap, size >> PAGE_SHIFT);

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809
810#ifdef CONFIG_MEMORY_HOTPLUG
811static void free_hotplug_page_range(struct page *page, size_t size,
812 struct vmem_altmap *altmap)
813{
814 if (altmap) {
815 vmem_altmap_free(altmap, size >> PAGE_SHIFT);

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