1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright 2003 PathScale Inc 4 * Derived from include/asm-i386/pgtable.h 5 */ 6 7 #ifndef __UM_PGTABLE_3LEVEL_H 8 #define __UM_PGTABLE_3LEVEL_H 9 10 #include <asm-generic/pgtable-nopud.h> 11 12 /* PGDIR_SHIFT determines what a third-level page table entry can map */ 13 14 #ifdef CONFIG_64BIT 15 #define PGDIR_SHIFT 30 16 #else 17 #define PGDIR_SHIFT 31 18 #endif 19 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) 20 #define PGDIR_MASK (~(PGDIR_SIZE-1)) 21 22 /* PMD_SHIFT determines the size of the area a second-level page table can 23 * map 24 */ 25 26 #define PMD_SHIFT 21 27 #define PMD_SIZE (1UL << PMD_SHIFT) 28 #define PMD_MASK (~(PMD_SIZE-1)) 29 30 /* 31 * entries per page directory level 32 */ 33 34 #define PTRS_PER_PTE 512 35 #ifdef CONFIG_64BIT 36 #define PTRS_PER_PMD 512 37 #define PTRS_PER_PGD 512 38 #else 39 #define PTRS_PER_PMD 1024 40 #define PTRS_PER_PGD 1024 41 #endif 42 43 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE) 44 45 #define pte_ERROR(e) \ 46 printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \ 47 pte_val(e)) 48 #define pmd_ERROR(e) \ 49 printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \ 50 pmd_val(e)) 51 #define pgd_ERROR(e) \ 52 printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \ 53 pgd_val(e)) 54 55 #define pud_none(x) (!(pud_val(x) & ~_PAGE_NEWPAGE)) 56 #define pud_bad(x) ((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE) 57 #define pud_present(x) (pud_val(x) & _PAGE_PRESENT) 58 #define pud_populate(mm, pud, pmd) \ 59 set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd))) 60 61 #define set_pud(pudptr, pudval) (*(pudptr) = (pudval)) 62 63 static inline int pgd_newpage(pgd_t pgd) 64 { 65 return(pgd_val(pgd) & _PAGE_NEWPAGE); 66 } 67 68 static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; } 69 70 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) 71 72 static inline void pud_clear (pud_t *pud) 73 { 74 set_pud(pud, __pud(_PAGE_NEWPAGE)); 75 } 76 77 #define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK) 78 #define pud_pgtable(pud) ((pmd_t *) __va(pud_val(pud) & PAGE_MASK)) 79 80 static inline unsigned long pte_pfn(pte_t pte) 81 { 82 return phys_to_pfn(pte_val(pte)); 83 } 84 85 static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) 86 { 87 pte_t pte; 88 phys_t phys = pfn_to_phys(page_nr); 89 90 pte_set_val(pte, phys, pgprot); 91 return pte; 92 } 93 94 static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot) 95 { 96 return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot)); 97 } 98 99 #endif 100 101