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_DEVMAP_SHIFT 59 26 #define _PAGE_PRESENT_INVALID_SHIFT 60 27 #define _PAGE_NO_READ_SHIFT 61 28 #define _PAGE_NO_EXEC_SHIFT 62 29 #define _PAGE_RPLV_SHIFT 63 30 31 /* Used by software */ 32 #define _PAGE_PRESENT (_ULCAST_(1) << _PAGE_PRESENT_SHIFT) 33 #define _PAGE_PRESENT_INVALID (_ULCAST_(1) << _PAGE_PRESENT_INVALID_SHIFT) 34 #define _PAGE_WRITE (_ULCAST_(1) << _PAGE_WRITE_SHIFT) 35 #define _PAGE_ACCESSED (_ULCAST_(1) << _PAGE_ACCESSED_SHIFT) 36 #define _PAGE_MODIFIED (_ULCAST_(1) << _PAGE_MODIFIED_SHIFT) 37 #define _PAGE_PROTNONE (_ULCAST_(1) << _PAGE_PROTNONE_SHIFT) 38 #define _PAGE_SPECIAL (_ULCAST_(1) << _PAGE_SPECIAL_SHIFT) 39 #define _PAGE_DEVMAP (_ULCAST_(1) << _PAGE_DEVMAP_SHIFT) 40 41 /* We borrow bit 23 to store the exclusive marker in swap PTEs. */ 42 #define _PAGE_SWP_EXCLUSIVE (_ULCAST_(1) << _PAGE_SWP_EXCLUSIVE_SHIFT) 43 44 /* Used by TLB hardware (placed in EntryLo*) */ 45 #define _PAGE_VALID (_ULCAST_(1) << _PAGE_VALID_SHIFT) 46 #define _PAGE_DIRTY (_ULCAST_(1) << _PAGE_DIRTY_SHIFT) 47 #define _PAGE_PLV (_ULCAST_(3) << _PAGE_PLV_SHIFT) 48 #define _PAGE_GLOBAL (_ULCAST_(1) << _PAGE_GLOBAL_SHIFT) 49 #define _PAGE_HUGE (_ULCAST_(1) << _PAGE_HUGE_SHIFT) 50 #define _PAGE_HGLOBAL (_ULCAST_(1) << _PAGE_HGLOBAL_SHIFT) 51 #define _PAGE_NO_READ (_ULCAST_(1) << _PAGE_NO_READ_SHIFT) 52 #define _PAGE_NO_EXEC (_ULCAST_(1) << _PAGE_NO_EXEC_SHIFT) 53 #define _PAGE_RPLV (_ULCAST_(1) << _PAGE_RPLV_SHIFT) 54 #define _CACHE_MASK (_ULCAST_(3) << _CACHE_SHIFT) 55 #define PFN_PTE_SHIFT (PAGE_SHIFT - 12 + _PAGE_PFN_SHIFT) 56 57 #define _PAGE_USER (PLV_USER << _PAGE_PLV_SHIFT) 58 #define _PAGE_KERN (PLV_KERN << _PAGE_PLV_SHIFT) 59 60 #define _PFN_MASK (~((_ULCAST_(1) << (PFN_PTE_SHIFT)) - 1) & \ 61 ((_ULCAST_(1) << (_PAGE_PFN_END_SHIFT)) - 1)) 62 63 /* 64 * Cache attributes 65 */ 66 #ifndef _CACHE_SUC 67 #define _CACHE_SUC (0<<_CACHE_SHIFT) /* Strong-ordered UnCached */ 68 #endif 69 #ifndef _CACHE_CC 70 #define _CACHE_CC (1<<_CACHE_SHIFT) /* Coherent Cached */ 71 #endif 72 #ifndef _CACHE_WUC 73 #define _CACHE_WUC (2<<_CACHE_SHIFT) /* Weak-ordered UnCached */ 74 #endif 75 76 #define __READABLE (_PAGE_VALID) 77 #define __WRITEABLE (_PAGE_DIRTY | _PAGE_WRITE) 78 79 #define _PAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PAGE_DEVMAP | _PFN_MASK | _CACHE_MASK | _PAGE_PLV) 80 #define _HPAGE_CHG_MASK (_PAGE_MODIFIED | _PAGE_SPECIAL | _PAGE_DEVMAP | _PFN_MASK | _CACHE_MASK | _PAGE_PLV | _PAGE_HUGE) 81 82 #define PAGE_NONE __pgprot(_PAGE_PROTNONE | _PAGE_NO_READ | \ 83 _PAGE_USER | _CACHE_CC) 84 #define PAGE_SHARED __pgprot(_PAGE_PRESENT | _PAGE_WRITE | \ 85 _PAGE_USER | _CACHE_CC) 86 #define PAGE_READONLY __pgprot(_PAGE_PRESENT | _PAGE_USER | _CACHE_CC) 87 88 #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 89 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_CC) 90 #define PAGE_KERNEL_SUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 91 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_SUC) 92 #define PAGE_KERNEL_WUC __pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \ 93 _PAGE_GLOBAL | _PAGE_KERN | _CACHE_WUC) 94 95 #ifndef __ASSEMBLY__ 96 97 #define _PAGE_IOREMAP pgprot_val(PAGE_KERNEL_SUC) 98 99 #define pgprot_noncached pgprot_noncached 100 101 static inline pgprot_t pgprot_noncached(pgprot_t _prot) 102 { 103 unsigned long prot = pgprot_val(_prot); 104 105 prot = (prot & ~_CACHE_MASK) | _CACHE_SUC; 106 107 return __pgprot(prot); 108 } 109 110 extern bool wc_enabled; 111 112 #define pgprot_writecombine pgprot_writecombine 113 114 static inline pgprot_t pgprot_writecombine(pgprot_t _prot) 115 { 116 unsigned long prot = pgprot_val(_prot); 117 118 prot = (prot & ~_CACHE_MASK) | (wc_enabled ? _CACHE_WUC : _CACHE_SUC); 119 120 return __pgprot(prot); 121 } 122 123 #endif /* !__ASSEMBLY__ */ 124 125 #endif /* _ASM_PGTABLE_BITS_H */ 126