1/*
2 *  arch/arm/include/asm/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/* PAGE_SHIFT determines the page size */
14#define PAGE_SHIFT		12
15#define PAGE_SIZE		(_AC(1,UL) << PAGE_SHIFT)
16#define PAGE_MASK		(~((1 << PAGE_SHIFT) - 1))
17
18#ifndef __ASSEMBLY__
19
20#ifndef CONFIG_MMU
21
22#include <asm/page-nommu.h>
23
24#else
25
26#include <asm/glue.h>
27
28/*
29 *	User Space Model
30 *	================
31 *
32 *	This section selects the correct set of functions for dealing with
33 *	page-based copying and clearing for user space for the particular
34 *	processor(s) we're building for.
35 *
36 *	We have the following to choose from:
37 *	  v4wt		- ARMv4 with writethrough cache, without minicache
38 *	  v4wb		- ARMv4 with writeback cache, without minicache
39 *	  v4_mc		- ARMv4 with minicache
40 *	  xscale	- Xscale
41 *	  xsc3		- XScalev3
42 */
43#undef _USER
44#undef MULTI_USER
45
46#ifdef CONFIG_CPU_COPY_V4WT
47# ifdef _USER
48#  define MULTI_USER 1
49# else
50#  define _USER v4wt
51# endif
52#endif
53
54#ifdef CONFIG_CPU_COPY_V4WB
55# ifdef _USER
56#  define MULTI_USER 1
57# else
58#  define _USER v4wb
59# endif
60#endif
61
62#ifdef CONFIG_CPU_COPY_FEROCEON
63# ifdef _USER
64#  define MULTI_USER 1
65# else
66#  define _USER feroceon
67# endif
68#endif
69
70#ifdef CONFIG_CPU_COPY_FA
71# ifdef _USER
72#  define MULTI_USER 1
73# else
74#  define _USER fa
75# endif
76#endif
77
78#ifdef CONFIG_CPU_SA1100
79# ifdef _USER
80#  define MULTI_USER 1
81# else
82#  define _USER v4_mc
83# endif
84#endif
85
86#ifdef CONFIG_CPU_XSCALE
87# ifdef _USER
88#  define MULTI_USER 1
89# else
90#  define _USER xscale_mc
91# endif
92#endif
93
94#ifdef CONFIG_CPU_XSC3
95# ifdef _USER
96#  define MULTI_USER 1
97# else
98#  define _USER xsc3_mc
99# endif
100#endif
101
102#ifdef CONFIG_CPU_COPY_V6
103# define MULTI_USER 1
104#endif
105
106#if !defined(_USER) && !defined(MULTI_USER)
107#error Unknown user operations model
108#endif
109
110struct page;
111struct vm_area_struct;
112
113struct cpu_user_fns {
114	void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
115	void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
116			unsigned long vaddr, struct vm_area_struct *vma);
117};
118
119#ifdef MULTI_USER
120extern struct cpu_user_fns cpu_user;
121
122#define __cpu_clear_user_highpage	cpu_user.cpu_clear_user_highpage
123#define __cpu_copy_user_highpage	cpu_user.cpu_copy_user_highpage
124
125#else
126
127#define __cpu_clear_user_highpage	__glue(_USER,_clear_user_highpage)
128#define __cpu_copy_user_highpage	__glue(_USER,_copy_user_highpage)
129
130extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
131extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
132			unsigned long vaddr, struct vm_area_struct *vma);
133#endif
134
135#define clear_user_highpage(page,vaddr)		\
136	 __cpu_clear_user_highpage(page, vaddr)
137
138#define __HAVE_ARCH_COPY_USER_HIGHPAGE
139#define copy_user_highpage(to,from,vaddr,vma)	\
140	__cpu_copy_user_highpage(to, from, vaddr, vma)
141
142#define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
143extern void copy_page(void *to, const void *from);
144
145#ifdef CONFIG_KUSER_HELPERS
146#define __HAVE_ARCH_GATE_AREA 1
147#endif
148
149#ifdef CONFIG_ARM_LPAE
150#include <asm/pgtable-3level-types.h>
151#else
152#include <asm/pgtable-2level-types.h>
153#endif
154
155#endif /* CONFIG_MMU */
156
157typedef struct page *pgtable_t;
158
159#ifdef CONFIG_HAVE_ARCH_PFN_VALID
160extern int pfn_valid(unsigned long);
161#endif
162
163#include <asm/memory.h>
164
165#endif /* !__ASSEMBLY__ */
166
167#define VM_DATA_DEFAULT_FLAGS \
168	(((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
169	 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
170
171#include <asm-generic/getorder.h>
172
173#endif
174