1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef _ASM_X86_PGTABLE_3LEVEL_DEFS_H 3 #define _ASM_X86_PGTABLE_3LEVEL_DEFS_H 4 5 #ifndef __ASSEMBLY__ 6 #include <linux/types.h> 7 8 typedef u64 pteval_t; 9 typedef u64 pmdval_t; 10 typedef u64 pudval_t; 11 typedef u64 p4dval_t; 12 typedef u64 pgdval_t; 13 typedef u64 pgprotval_t; 14 15 typedef union { 16 struct { 17 unsigned long pte_low, pte_high; 18 }; 19 pteval_t pte; 20 } pte_t; 21 22 typedef union { 23 struct { 24 unsigned long pmd_low, pmd_high; 25 }; 26 pmdval_t pmd; 27 } pmd_t; 28 #endif /* !__ASSEMBLY__ */ 29 30 #define SHARED_KERNEL_PMD (!static_cpu_has(X86_FEATURE_PTI)) 31 32 #define ARCH_PAGE_TABLE_SYNC_MASK (SHARED_KERNEL_PMD ? 0 : PGTBL_PMD_MODIFIED) 33 34 /* 35 * PGDIR_SHIFT determines what a top-level page table entry can map 36 */ 37 #define PGDIR_SHIFT 30 38 #define PTRS_PER_PGD 4 39 40 /* 41 * PMD_SHIFT determines the size of the area a middle-level 42 * page table can map 43 */ 44 #define PMD_SHIFT 21 45 #define PTRS_PER_PMD 512 46 47 /* 48 * entries per page directory level 49 */ 50 #define PTRS_PER_PTE 512 51 52 #define MAX_POSSIBLE_PHYSMEM_BITS 36 53 #define PGD_KERNEL_START (CONFIG_PAGE_OFFSET >> PGDIR_SHIFT) 54 55 #endif /* _ASM_X86_PGTABLE_3LEVEL_DEFS_H */ 56