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
 99static 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
108extern bool wc_enabled;
109
110#define pgprot_writecombine pgprot_writecombine
111
112static 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 */