pgtable-bits.h

  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
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
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
147extern bool wc_enabled;
148
149#define pgprot_writecombine pgprot_writecombine
150
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 */