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