summaryrefslogtreecommitdiff
path: root/include/asm-mips/page.h
blob: 3d262c01521c3ea78821797cf7de79b049c9d9d2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 */
#ifndef _ASM_PAGE_H
#define _ASM_PAGE_H

#include <linux/config.h>

#ifdef __KERNEL__

#include <spaces.h>

#endif

/*
 * PAGE_SHIFT determines the page size
 */
#ifdef CONFIG_PAGE_SIZE_4KB
#define PAGE_SHIFT	12
#endif
#ifdef CONFIG_PAGE_SIZE_8KB
#define PAGE_SHIFT	13
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
#define PAGE_SHIFT	14
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
#define PAGE_SHIFT	16
#endif
#define PAGE_SIZE	(1UL << PAGE_SHIFT)
#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))


#ifdef __KERNEL__
#ifndef __ASSEMBLY__

extern void clear_page(void * page);
extern void copy_page(void * to, void * from);

extern unsigned long shm_align_mask;

static inline unsigned long pages_do_alias(unsigned long addr1,
	unsigned long addr2)
{
	return (addr1 ^ addr2) & shm_align_mask;
}

struct page;

static inline void clear_user_page(void *addr, unsigned long vaddr,
	struct page *page)
{
	extern void (*flush_data_cache_page)(unsigned long addr);

	clear_page(addr);
	if (pages_do_alias((unsigned long) addr, vaddr))
		flush_data_cache_page((unsigned long)addr);
}

static inline void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
	struct page *to)
{
	extern void (*flush_data_cache_page)(unsigned long addr);

	copy_page(vto, vfrom);
	if (pages_do_alias((unsigned long)vto, vaddr))
		flush_data_cache_page((unsigned long)vto);
}

/*
 * These are used to make use of C type-checking..
 */
#ifdef CONFIG_64BIT_PHYS_ADDR
  #ifdef CONFIG_CPU_MIPS32
    typedef struct { unsigned long pte_low, pte_high; } pte_t;
    #define pte_val(x)    ((x).pte_low | ((unsigned long long)(x).pte_high << 32))
  #else
     typedef struct { unsigned long long pte; } pte_t;
     #define pte_val(x)	((x).pte)
  #endif
#else
typedef struct { unsigned long pte; } pte_t;
#define pte_val(x)	((x).pte)
#endif
#define __pte(x)	((pte_t) { (x) } )

/*
 * For 3-level pagetables we defines these ourselves, for 2-level the
 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
 */
#ifdef CONFIG_64BIT

typedef struct { unsigned long pmd; } pmd_t;
#define pmd_val(x)	((x).pmd)
#define __pmd(x)	((pmd_t) { (x) } )

#endif

/*
 * Right now we don't support 4-level pagetables, so all pud-related
 * definitions come from <asm-generic/pgtable-nopud.h>.
 */

/*
 * Finall the top of the hierarchy, the pgd
 */
typedef struct { unsigned long pgd; } pgd_t;
#define pgd_val(x)	((x).pgd)
#define __pgd(x)	((pgd_t) { (x) } )

/*
 * Manipulate page protection bits
 */
typedef struct { unsigned long pgprot; } pgprot_t;
#define pgprot_val(x)	((x).pgprot)
#define __pgprot(x)	((pgprot_t) { (x) } )

/*
 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 * pair of pages we only have a single global bit per pair of pages.  When
 * writing to the TLB make sure we always have the bit set for both pages
 * or none.  This macro is used to access the `buddy' of the pte we're just
 * working on.
 */
#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))

#endif /* !__ASSEMBLY__ */

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	(((addr) + PAGE_SIZE - 1) & PAGE_MASK)

#define __pa(x)			((unsigned long) (x) - PAGE_OFFSET)
#define __va(x)			((void *)((unsigned long) (x) + PAGE_OFFSET))

#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

#ifndef CONFIG_SPARSEMEM
#ifndef CONFIG_NEED_MULTIPLE_NODES
#define pfn_valid(pfn)		((pfn) < max_mapnr)
#endif
#endif

#ifdef CONFIG_FLATMEM

#define pfn_valid(pfn)		((pfn) < max_mapnr)

#elif defined(CONFIG_NEED_MULTIPLE_NODES)

#define pfn_valid(pfn)							\
({									\
	unsigned long __pfn = (pfn);					\
	int __n = pfn_to_nid(__pfn);					\
	((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +		\
	                       NODE_DATA(__n)->node_spanned_pages)	\
	            : 0);						\
})

#else
#error Provide a definition of pfn_valid
#endif

#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
#define CAC_ADDR(addr)		((addr) - UNCAC_BASE + PAGE_OFFSET)

#endif /* defined (__KERNEL__) */

#ifdef CONFIG_LIMITED_DMA
#define WANT_PAGE_VIRTUAL
#endif

#include <asm-generic/memory_model.h>
#include <asm-generic/page.h>

#endif /* _ASM_PAGE_H */