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Linux kernel mirror (for testing)
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linux
1/*
2 * linux/include/asm-arm/page.h
3 *
4 * Copyright (C) 1995-2003 Russell King
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10#ifndef _ASMARM_PAGE_H
11#define _ASMARM_PAGE_H
12
13#include <linux/config.h>
14
15/* PAGE_SHIFT determines the page size */
16#define PAGE_SHIFT 12
17#define PAGE_SIZE (1UL << PAGE_SHIFT)
18#define PAGE_MASK (~(PAGE_SIZE-1))
19
20#ifdef __KERNEL__
21
22/* to align the pointer to the (next) page boundary */
23#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
24
25#ifndef __ASSEMBLY__
26
27#include <asm/glue.h>
28
29/*
30 * User Space Model
31 * ================
32 *
33 * This section selects the correct set of functions for dealing with
34 * page-based copying and clearing for user space for the particular
35 * processor(s) we're building for.
36 *
37 * We have the following to choose from:
38 * v3 - ARMv3
39 * v4wt - ARMv4 with writethrough cache, without minicache
40 * v4wb - ARMv4 with writeback cache, without minicache
41 * v4_mc - ARMv4 with minicache
42 * xscale - Xscale
43 * xsc3 - XScalev3
44 */
45#undef _USER
46#undef MULTI_USER
47
48#ifdef CONFIG_CPU_COPY_V3
49# ifdef _USER
50# define MULTI_USER 1
51# else
52# define _USER v3
53# endif
54#endif
55
56#ifdef CONFIG_CPU_COPY_V4WT
57# ifdef _USER
58# define MULTI_USER 1
59# else
60# define _USER v4wt
61# endif
62#endif
63
64#ifdef CONFIG_CPU_COPY_V4WB
65# ifdef _USER
66# define MULTI_USER 1
67# else
68# define _USER v4wb
69# endif
70#endif
71
72#ifdef CONFIG_CPU_SA1100
73# ifdef _USER
74# define MULTI_USER 1
75# else
76# define _USER v4_mc
77# endif
78#endif
79
80#ifdef CONFIG_CPU_XSCALE
81# ifdef _USER
82# define MULTI_USER 1
83# else
84# define _USER xscale_mc
85# endif
86#endif
87
88#ifdef CONFIG_CPU_XSC3
89# ifdef _USER
90# define MULTI_USER 1
91# else
92# define _USER xsc3_mc
93# endif
94#endif
95
96#ifdef CONFIG_CPU_COPY_V6
97# define MULTI_USER 1
98#endif
99
100#if !defined(_USER) && !defined(MULTI_USER)
101#error Unknown user operations model
102#endif
103
104struct cpu_user_fns {
105 void (*cpu_clear_user_page)(void *p, unsigned long user);
106 void (*cpu_copy_user_page)(void *to, const void *from,
107 unsigned long user);
108};
109
110#ifdef MULTI_USER
111extern struct cpu_user_fns cpu_user;
112
113#define __cpu_clear_user_page cpu_user.cpu_clear_user_page
114#define __cpu_copy_user_page cpu_user.cpu_copy_user_page
115
116#else
117
118#define __cpu_clear_user_page __glue(_USER,_clear_user_page)
119#define __cpu_copy_user_page __glue(_USER,_copy_user_page)
120
121extern void __cpu_clear_user_page(void *p, unsigned long user);
122extern void __cpu_copy_user_page(void *to, const void *from,
123 unsigned long user);
124#endif
125
126#define clear_user_page(addr,vaddr,pg) __cpu_clear_user_page(addr, vaddr)
127#define copy_user_page(to,from,vaddr,pg) __cpu_copy_user_page(to, from, vaddr)
128
129#define clear_page(page) memzero((void *)(page), PAGE_SIZE)
130extern void copy_page(void *to, const void *from);
131
132#undef STRICT_MM_TYPECHECKS
133
134#ifdef STRICT_MM_TYPECHECKS
135/*
136 * These are used to make use of C type-checking..
137 */
138typedef struct { unsigned long pte; } pte_t;
139typedef struct { unsigned long pmd; } pmd_t;
140typedef struct { unsigned long pgd[2]; } pgd_t;
141typedef struct { unsigned long pgprot; } pgprot_t;
142
143#define pte_val(x) ((x).pte)
144#define pmd_val(x) ((x).pmd)
145#define pgd_val(x) ((x).pgd[0])
146#define pgprot_val(x) ((x).pgprot)
147
148#define __pte(x) ((pte_t) { (x) } )
149#define __pmd(x) ((pmd_t) { (x) } )
150#define __pgprot(x) ((pgprot_t) { (x) } )
151
152#else
153/*
154 * .. while these make it easier on the compiler
155 */
156typedef unsigned long pte_t;
157typedef unsigned long pmd_t;
158typedef unsigned long pgd_t[2];
159typedef unsigned long pgprot_t;
160
161#define pte_val(x) (x)
162#define pmd_val(x) (x)
163#define pgd_val(x) ((x)[0])
164#define pgprot_val(x) (x)
165
166#define __pte(x) (x)
167#define __pmd(x) (x)
168#define __pgprot(x) (x)
169
170#endif /* STRICT_MM_TYPECHECKS */
171
172/* the upper-most page table pointer */
173extern pmd_t *top_pmd;
174
175#include <asm/memory.h>
176
177#endif /* !__ASSEMBLY__ */
178
179#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
180 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
181
182/*
183 * With EABI on ARMv5 and above we must have 64-bit aligned slab pointers.
184 */
185#if defined(CONFIG_AEABI) && (__LINUX_ARM_ARCH__ >= 5)
186#define ARCH_SLAB_MINALIGN 8
187#endif
188
189#endif /* __KERNEL__ */
190
191#include <asm-generic/page.h>
192
193#endif