1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #ifndef _ASM_PGTABLE_BITS_H 6 #define _ASM_PGTABLE_BITS_H 7 8 /* Page table bits */ 9 10 #ifdef CONFIG_32BIT 11 #define _PAGE_VALID_SHIFT 0 12 #define _PAGE_ACCESSED_SHIFT 0 /* Reuse Valid for Accessed */ 13 #define _PAGE_DIRTY_SHIFT 1 14 #define _PAGE_PLV_SHIFT 2 /* 2~3, two bits */ 15 #define _CACHE_SHIFT 4 /* 4~5, two bits */ 16 #define _PAGE_GLOBAL_SHIFT 6 17 #define _PAGE_HUGE_SHIFT 6 /* HUGE is a PMD bit */ 18 #define _PAGE_PRESENT_SHIFT 7 19 #define _PAGE_PFN_SHIFT 8 20 #define _PAGE_HGLOBAL_SHIFT 12 /* HGlobal is a PMD bit */ 21 #define _PAGE_SWP_EXCLUSIVE_SHIFT 13 22 #define _PAGE_PFN_END_SHIFT 28 23 #define _PAGE_WRITE_SHIFT 29 24 #define _PAGE_MODIFIED_SHIFT 30 25 #define _PAGE_PRESENT_INVALID_SHIFT 31 26 #endif 27 28 #ifdef CONFIG_64BIT 29 #define _PAGE_VALID_SHIFT 0 30 #define _PAGE_ACCESSED_SHIFT 0 /* Reuse Valid for Accessed */ 31 #define _PAGE_DIRTY_SHIFT 1 32 #define _PAGE_PLV_SHIFT 2 /* 2~3, two bits */ 33 #define _CACHE_SHIFT 4 /* 4~5, two bits */ 34 #define _PAGE_GLOBAL_SHIFT 6 35 #define _PAGE_HUGE_SHIFT 6 /* HUGE is a PMD bit */ 36 #define _PAGE_PRESENT_SHIFT 7 37 #define _PAGE_WRITE_SHIFT 8 38 #define _PAGE_MODIFIED_SHIFT 9 39 #define _PAGE_PROTNONE_SHIFT 10 40 #define _PAGE_SPECIAL_SHIFT 11 41 #define _PAGE_PFN_SHIFT 12 42 #define _PAGE_HGLOBAL_SHIFT 12 /* HGlobal is a PMD bit */ 43 #define _PAGE_SWP_EXCLUSIVE_SHIFT 23 44 #define _PAGE_PFN_END_SHIFT 48 45 #define _PAGE_PRESENT_INVALID_SHIFT 60 46 #define _PAGE_NO_READ_SHIFT 61 47 #define _PAGE_NO_EXEC_SHIFT 62 48 #define _PAGE_RPLV_SHIFT 63 49 #endif 50 51 /* Used by software */ 52 #define _PAGE_PRESENT (_ULCAST_(1) << _PAGE_PRESENT_SHIFT) 53 #define _PAGE_PRESENT_INVALID (_ULCAST_(1) << _PAGE_PRESENT_INVALID_SHIFT) 54 #define _PAGE_WRITE (_ULCAST_(1) << _PAGE_WRITE_SHIFT) 55 #define _PAGE_ACCESSED (_ULCAST_(1) << _PAGE_ACCESSED_SHIFT) 56 #define _PAGE_MODIFIED (_ULCAST_(1) << _PAGE_MODIFIED_SHIFT) 57 #ifdef CONFIG_32BIT 58 #define _PAGE_PROTNONE 0 59 #define _PAGE_SPECIAL 0 60 #else 61 #define _PAGE_PROTNONE (_ULCAST_(1) << _PAGE_PROTNONE_SHIFT) 62 #define _PAGE_SPECIAL (_ULCAST_(1) << _PAGE_SPECIAL_SHIFT) 63 #endif 64 65 /* We borrow bit 13/23 to store the exclusive marker in swap PTEs. */ 66 #define _PAGE_SWP_EXCLUSIVE (_ULCAST_(1) << _PAGE_SWP_EXCLUSIVE_SHIFT) 67 68 /* Used by TLB hardware (placed in EntryLo*) */ 69 #define _PAGE_VALID (_ULCAST_(1) << _PAGE_VALID_SHIFT) 70 #define _PAGE_DIRTY (_ULCAST_(1) << _PAGE_DIRTY_SHIFT) 71 #define _PAGE_PLV (_ULCAST_(3) << _PAGE_PLV_SHIFT) 72 #define _PAGE_GLOBAL (_ULCAST_(1) << _PAGE_GLOBAL_SHIFT) 73 #define _PAGE_HUGE (_ULCAST_(1) << _PAGE_HUGE_SHIFT) 74 #define _PAGE_HGLOBAL (_ULCAST_(1) << _PAGE_HGLOBAL_SHIFT) 75 #ifdef CONFIG_32BIT 76 #define _PAGE_NO_READ 0 77 #define _PAGE_NO_EXEC 0 78 #define _PAGE_RPLV 0 79 #else 80 #define _PAGE_NO_READ (_ULCAST_(1) << _PAGE_NO_READ_SHIFT) 81 #define _PAGE_NO_EXEC (_ULCAST_(1) << _PAGE_NO_EXEC_SHIFT) 82 #define _PAGE_RPLV (_ULCAST_(1) << _PAGE_RPLV_SHIFT) 83 #endif 84 #define _CACHE_MASK (_ULCAST_(3) << _CACHE_SHIFT) 85 #define PFN_PTE_SHIFT (PAGE_SHIFT - 12 + _PAGE_PFN_SHIFT) 86 87 #define _PAGE_USER (PLV_USER << _PAGE_PLV_SHIFT) 88 #define _PAGE_KERN (PLV_KERN << _PAGE_PLV_SHIFT) 89 90 #define _PFN_MASK (~((_ULCAST_(1) << (PFN_PTE_SHIFT)) - 1) & \ 91 ((_ULCAST_(1) << (_PAGE_PFN_END_SHIFT)) - 1)) 92 93 /* 94 * Cache attributes 95 */ 96 #ifndef _CACHE_SUC 97 #define _CACHE_SUC (0<<_CACHE_SHIFT) /* Strong-ordered UnCached */ 98 #endif 99 #ifndef _CACHE_CC 100 #define _CACHE_CC (1<<_CACHE_SHIFT) /* Coherent Cached */ 101 #endif 102 #ifndef _CACHE_WUC 103 #define _CACHE_WUC (2<<_CACHE_SHIFT) /* Weak-ordered UnCached */ 104 #endif 105 106 #define __READABLE (_PAGE_VALID) 107 #define __WRITEABLE (_PAGE_DIRTY | _PAGE_WRITE) 108 109 #define _PAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PFN_MASK | _CACHE_MASK | _PAGE_PLV) 110 #define _HPAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PFN_MASK | _CACHE_MASK | _PAGE_PLV | _PAGE_HUGE) 111 112 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_NO_READ | \ 113 _PAGE_USER | _CACHE_CC) 114 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ 115 _PAGE_USER | _CACHE_CC) 116 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _CACHE_CC) 117 118 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 119 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_CC) 120 #define PAGE_KERNEL_SUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 121 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_SUC) 122 #define PAGE_KERNEL_WUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 123 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_WUC) 124 125 #ifndef __ASSEMBLER__ 126 127 #define _PAGE_IOREMAP pgprot_val(PAGE_KERNEL_SUC) 128 129 #define pgprot_nx pgprot_nx 130 pgprot_nx(pgprot_t _prot)131static inline pgprot_t pgprot_nx(pgprot_t _prot) 132 { 133 return __pgprot(pgprot_val(_prot) | _PAGE_NO_EXEC); 134 } 135 136 #define pgprot_noncached pgprot_noncached 137 pgprot_noncached(pgprot_t _prot)138static inline pgprot_t pgprot_noncached(pgprot_t _prot) 139 { 140 unsigned long prot = pgprot_val(_prot); 141 142 prot = (prot & ~_CACHE_MASK) | _CACHE_SUC; 143 144 return __pgprot(prot); 145 } 146 147 extern bool wc_enabled; 148 149 #define pgprot_writecombine pgprot_writecombine 150 pgprot_writecombine(pgprot_t _prot)151static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 152 { 153 unsigned long prot = pgprot_val(_prot); 154 155 prot = (prot & ~_CACHE_MASK) | (wc_enabled ? _CACHE_WUC : _CACHE_SUC); 156 157 return __pgprot(prot); 158 } 159 160 #endif /* !__ASSEMBLER__ */ 161 162 #endif /* _ASM_PGTABLE_BITS_H */ 163