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/* 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 init_top_pgt extern void paging_init(void); static inline void sync_initial_page_table(void) { } #define pte_ERROR(e) \ pr_err("%s:%d: bad pte %p(%016lx)\n", \ __FILE__, __LINE__, &(e), pte_val(e)) #define pmd_ERROR(e) \ pr_err("%s:%d: bad pmd %p(%016lx)\n", \ __FILE__, __LINE__, &(e), pmd_val(e)) #define pud_ERROR(e) \ pr_err("%s:%d: bad pud %p(%016lx)\n", \ __FILE__, __LINE__, &(e), pud_val(e)) #if CONFIG_PGTABLE_LEVELS >= 5 #define p4d_ERROR(e) \ pr_err("%s:%d: bad p4d %p(%016lx)\n", \ __FILE__, __LINE__, &(e), p4d_val(e)) #endif #define pgd_ERROR(e) \ pr_err("%s:%d: bad pgd %p(%016lx)\n", \ __FILE__, __LINE__, &(e), pgd_val(e)) struct mm_struct; 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) { WRITE_ONCE(ptep, pte); } static inline void native_pte_clear(struct mm_struct mm, unsigned long addr, pte_t ptep) { native_set_pte(ptep, native_make_pte(0)); } static inline void native_set_pte_atomic(pte_t ptep, pte_t pte) { native_set_pte(ptep, pte); } static inline void native_set_pmd(pmd_t pmdp, pmd_t pmd) { WRITE_ONCE(pmdp, pmd); } static inline void native_pmd_clear(pmd_t pmd) { native_set_pmd(pmd, native_make_pmd(0)); } static inline pte_t native_ptep_get_and_clear(pte_t xp) { #ifdef CONFIG_SMP return native_make_pte(xchg(&xp->pte, 0)); #else / native_local_ptep_get_and_clear, but duplicated because of cyclic dependency / pte_t ret = xp; native_pte_clear(NULL, 0, xp); return ret; #endif } static inline pmd_t native_pmdp_get_and_clear(pmd_t xp) { #ifdef CONFIG_SMP return native_make_pmd(xchg(&xp->pmd, 0)); #else / native_local_pmdp_get_and_clear, but duplicated because of cyclic dependency / pmd_t ret = xp; native_pmd_clear(xp); return ret; #endif } static inline void native_set_pud(pud_t pudp, pud_t pud) { WRITE_ONCE(pudp, pud); } static inline void native_pud_clear(pud_t pud) { native_set_pud(pud, native_make_pud(0)); } static inline pud_t native_pudp_get_and_clear(pud_t xp) { #ifdef CONFIG_SMP return native_make_pud(xchg(&xp->pud, 0)); #else /* native_local_pudp_get_and_clear, * but duplicated because of cyclic dependency / pud_t ret = xp; native_pud_clear(xp); return ret; #endif } static inline void native_set_p4d(p4d_t p4dp, p4d_t p4d) { pgd_t pgd; if (pgtable_l5_enabled() \|\| !IS_ENABLED(CONFIG_PAGE_TABLE_ISOLATION)) { WRITE_ONCE(p4dp, p4d); return; } pgd = native_make_pgd(native_p4d_val(p4d)); pgd = pti_set_user_pgtbl((pgd_t )p4dp, pgd); WRITE_ONCE(p4dp, native_make_p4d(native_pgd_val(pgd))); } static inline void native_p4d_clear(p4d_t p4d) { native_set_p4d(p4d, native_make_p4d(0)); } static inline void native_set_pgd(pgd_t pgdp, pgd_t pgd) { WRITE_ONCE(pgdp, pti_set_user_pgtbl(pgdp, pgd)); } static inline void native_pgd_clear(pgd_t pgd) { native_set_pgd(pgd, native_make_pgd(0)); } extern void sync_global_pgds(unsigned long start, unsigned long end); /* * Conversion functions: convert a page and protection to a page entry, * and a page entry and page directory to the page they refer to. / / * Level 4 access. / #define mk_kernel_pgd(address) __pgd((address) \| _KERNPG_TABLE) / PUD - Level3 access / / PMD - Level 2 access / / PTE - Level 1 access. / / x86-64 always has all page tables mapped. / #define pte_offset_map(dir, address) pte_offset_kernel((dir), (address)) #define pte_unmap(pte) ((void)(pte))/ NOP / / * 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\| X\|X\|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 (1) in swp entry is used to store soft dirty bit, which helps us * remember soft dirty over page migration * * 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 5 #define SWP_OFFSET_FIRST_BIT (_PAGE_BIT_PROTNONE + 1) / We always extract/encode the offset by shifting it all the way up, and then down again / #define SWP_OFFSET_SHIFT (SWP_OFFSET_FIRST_BIT+SWP_TYPE_BITS) #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) / Extract the high bits for type / #define __swp_type(x) ((x).val >> (64 - SWP_TYPE_BITS)) / Shift up (to get rid of type), then down to get value / #define __swp_offset(x) (~(x).val << SWP_TYPE_BITS >> SWP_OFFSET_SHIFT) / * 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) ((swp_entry_t) { \ (~(unsigned long)(offset) << SWP_OFFSET_SHIFT >> SWP_TYPE_BITS) \ \| ((unsigned long)(type) << (64-SWP_TYPE_BITS)) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) }) #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val((pmd)) }) #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) #define __swp_entry_to_pmd(x) ((pmd_t) { .pmd = (x).val }) extern int kern_addr_valid(unsigned long addr); extern void cleanup_highmap(void); #define HAVE_ARCH_UNMAPPED_AREA #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN #define PAGE_AGP PAGE_KERNEL_NOCACHE #define HAVE_PAGE_AGP 1 / fs/proc/kcore.c / #define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK) #define kc_offset_to_vaddr(o) ((o) \| ~__VIRTUAL_MASK) #define __HAVE_ARCH_PTE_SAME #define vmemmap ((struct page )VMEMMAP_START) 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 gup_fast_permitted static inline bool gup_fast_permitted(unsigned long start, unsigned long end) { if (end >> __VIRTUAL_MASK_SHIFT) return false; return true; } #include <asm/pgtable-invert.h> #endif /* !__ASSEMBLY__ / #endif / _ASM_X86_PGTABLE_64_H */

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