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		(~(PAGE_SIZE-1))
 17
 18#ifndef __ASSEMBLY__
 19
 20#ifndef CONFIG_MMU
 21
 22#include "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#define __HAVE_ARCH_GATE_AREA 1
146
147#ifdef CONFIG_ARM_LPAE
148#include <asm/pgtable-3level-types.h>
149#else
150#include <asm/pgtable-2level-types.h>
151#endif
152
153#endif /* CONFIG_MMU */
154
155typedef struct page *pgtable_t;
156
157#ifdef CONFIG_HAVE_ARCH_PFN_VALID
158extern int pfn_valid(unsigned long);
159#endif
160
161#include <asm/memory.h>
162
163#endif /* !__ASSEMBLY__ */
164
165#define VM_DATA_DEFAULT_FLAGS \
166	(((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
167	 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
168
169#include <asm-generic/getorder.h>
170
171#endif