/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _ASM_X86_PGTABLE_64_H #define _ASM_X86_PGTABLE_64_H #include <linux/const.h> #include <asm/pgtable_64_types.h> #ifndef __ASSEMBLY__ /* * This file contains the functions and defines necessary to modify and use * the x86-64 page table tree. */ #include <asm/processor.h> #include <linux/bitops.h> #include <linux/threads.h> #include <asm/fixmap.h> extern p4d_t level4_kernel_pgt[512]; extern p4d_t level4_ident_pgt[512]; extern pud_t level3_kernel_pgt[512]; extern pud_t level3_ident_pgt[512]; extern pmd_t level2_kernel_pgt[512]; extern pmd_t level2_fixmap_pgt[512]; extern pmd_t level2_ident_pgt[512]; extern pte_t level1_fixmap_pgt[512 * FIXMAP_PMD_NUM]; extern pgd_t init_top_pgt[]; #define swapper_pg_dir … extern void paging_init(void); static inline void sync_initial_page_table(void) { … } #define pte_ERROR(e) … #define pmd_ERROR(e) … #define pud_ERROR(e) … #if CONFIG_PGTABLE_LEVELS >= 5 #define p4d_ERROR(e) … #endif #define pgd_ERROR(e) … struct mm_struct; #define mm_p4d_folded … static inline bool mm_p4d_folded(struct mm_struct *mm) { … } void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte); void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte); static inline void native_set_pte(pte_t *ptep, pte_t pte) { … } static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) { … } static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) { … } static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd) { … } static inline void native_pmd_clear(pmd_t *pmd) { … } static inline pte_t native_ptep_get_and_clear(pte_t *xp) { … } static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) { … } static inline void native_set_pud(pud_t *pudp, pud_t pud) { … } static inline void native_pud_clear(pud_t *pud) { … } static inline pud_t native_pudp_get_and_clear(pud_t *xp) { … } static inline void native_set_p4d(p4d_t *p4dp, p4d_t p4d) { … } static inline void native_p4d_clear(p4d_t *p4d) { … } static inline void native_set_pgd(pgd_t *pgdp, pgd_t pgd) { … } static inline void native_pgd_clear(pgd_t *pgd) { … } /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. */ /* PGD - Level 4 access */ /* PUD - Level 3 access */ /* PMD - Level 2 access */ /* PTE - Level 1 access */ /* * Encode and de-code a swap entry * * | ... | 11| 10| 9|8|7|6|5| 4| 3|2| 1|0| <- bit number * | ... |SW3|SW2|SW1|G|L|D|A|CD|WT|U| W|P| <- bit names * | TYPE (59-63) | ~OFFSET (9-58) |0|0|X|X| X| E|F|SD|0| <- swp entry * * G (8) is aliased and used as a PROT_NONE indicator for * !present ptes. We need to start storing swap entries above * there. We also need to avoid using A and D because of an * erratum where they can be incorrectly set by hardware on * non-present PTEs. * * SD Bits 1-4 are not used in non-present format and available for * special use described below: * * SD (1) in swp entry is used to store soft dirty bit, which helps us * remember soft dirty over page migration * * F (2) in swp entry is used to record when a pagetable is * writeprotected by userfaultfd WP support. * * E (3) in swp entry is used to remember PG_anon_exclusive. * * Bit 7 in swp entry should be 0 because pmd_present checks not only P, * but also L and G. * * The offset is inverted by a binary not operation to make the high * physical bits set. */ #define SWP_TYPE_BITS … #define SWP_OFFSET_FIRST_BIT … /* We always extract/encode the offset by shifting it all the way up, and then down again */ #define SWP_OFFSET_SHIFT … #define MAX_SWAPFILES_CHECK() … /* Extract the high bits for type */ #define __swp_type(x) … /* Shift up (to get rid of type), then down to get value */ #define __swp_offset(x) … /* * Shift the offset up "too far" by TYPE bits, then down again * The offset is inverted by a binary not operation to make the high * physical bits set. */ #define __swp_entry(type, offset) … #define __pte_to_swp_entry(pte) … #define __pmd_to_swp_entry(pmd) … #define __swp_entry_to_pte(x) … #define __swp_entry_to_pmd(x) … extern void cleanup_highmap(void); #define HAVE_ARCH_UNMAPPED_AREA #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN #define PAGE_AGP … #define HAVE_PAGE_AGP … /* fs/proc/kcore.c */ #define kc_vaddr_to_offset(v) … #define kc_offset_to_vaddr(o) … #define __HAVE_ARCH_PTE_SAME #define vmemmap … extern void init_extra_mapping_uc(unsigned long phys, unsigned long size); extern void init_extra_mapping_wb(unsigned long phys, unsigned long size); #define gup_fast_permitted … static inline bool gup_fast_permitted(unsigned long start, unsigned long end) { … } #include <asm/pgtable-invert.h> #else /* __ASSEMBLY__ */ #define l4_index … #define pud_index … L4_PAGE_OFFSET = l4_index(__PAGE_OFFSET_BASE_L4) L4_START_KERNEL = l4_index(__START_KERNEL_map) L3_START_KERNEL = pud_index(__START_KERNEL_map) #define SYM_DATA_START_PAGE_ALIGNED … /* Automate the creation of 1 to 1 mapping pmd entries */ #define PMDS … #endif /* __ASSEMBLY__ */ #endif /* _ASM_X86_PGTABLE_64_H */
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