page.h

Go to the documentation of this file.

/*
 *  arch/arm/include/asm/page.h
 *
 *  Copyright (C) 1995-2003 Russell King
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef _ASMARM_PAGE_H
#define _ASMARM_PAGE_H

/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT      12
#define PAGE_SIZE       (_AC(1,UL) << PAGE_SHIFT)
#define PAGE_MASK       (~(PAGE_SIZE-1))

#ifndef __ASSEMBLY__

#ifndef CONFIG_MMU

#include <asm/page-nommu.h>

#else

#include <asm/glue.h>

/*
 *  User Space Model
 *  ================
 *
 *  This section selects the correct set of functions for dealing with
 *  page-based copying and clearing for user space for the particular
 *  processor(s) we're building for.
 *
 *  We have the following to choose from:
 *    v4wt      - ARMv4 with writethrough cache, without minicache
 *    v4wb      - ARMv4 with writeback cache, without minicache
 *    v4_mc     - ARMv4 with minicache
 *    xscale    - Xscale
 *    xsc3      - XScalev3
 */
#undef _USER
#undef MULTI_USER

#ifdef CONFIG_CPU_COPY_V4WT
# ifdef _USER
#  define MULTI_USER 1
# else
#  define _USER v4wt
# endif
#endif

#ifdef CONFIG_CPU_COPY_V4WB
# ifdef _USER
#  define MULTI_USER 1
# else
#  define _USER v4wb
# endif
#endif

#ifdef CONFIG_CPU_COPY_FEROCEON
# ifdef _USER
#  define MULTI_USER 1
# else
#  define _USER feroceon
# endif
#endif

#ifdef CONFIG_CPU_COPY_FA
# ifdef _USER
#  define MULTI_USER 1
# else
#  define _USER fa
# endif
#endif

#ifdef CONFIG_CPU_SA1100
# ifdef _USER
#  define MULTI_USER 1
# else
#  define _USER v4_mc
# endif
#endif

#ifdef CONFIG_CPU_XSCALE
# ifdef _USER
#  define MULTI_USER 1
# else
#  define _USER xscale_mc
# endif
#endif

#ifdef CONFIG_CPU_XSC3
# ifdef _USER
#  define MULTI_USER 1
# else
#  define _USER xsc3_mc
# endif
#endif

#ifdef CONFIG_CPU_COPY_V6
# define MULTI_USER 1
#endif

#if !defined(_USER) && !defined(MULTI_USER)
#error Unknown user operations model
#endif

struct page;
struct vm_area_struct;

struct cpu_user_fns {
    void (*cpu_clear_user_highpage)(struct page *page, unsigned long vaddr);
    void (*cpu_copy_user_highpage)(struct page *to, struct page *from,
            unsigned long vaddr, struct vm_area_struct *vma);
};

#ifdef MULTI_USER
extern struct cpu_user_fns cpu_user;

#define __cpu_clear_user_highpage   cpu_user.cpu_clear_user_highpage
#define __cpu_copy_user_highpage    cpu_user.cpu_copy_user_highpage

#else

#define __cpu_clear_user_highpage   __glue(_USER,_clear_user_highpage)
#define __cpu_copy_user_highpage    __glue(_USER,_copy_user_highpage)

extern void __cpu_clear_user_highpage(struct page *page, unsigned long vaddr);
extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
            unsigned long vaddr, struct vm_area_struct *vma);
#endif

#define clear_user_highpage(page,vaddr)     \
     __cpu_clear_user_highpage(page, vaddr)

#define __HAVE_ARCH_COPY_USER_HIGHPAGE
#define copy_user_highpage(to,from,vaddr,vma)   \
    __cpu_copy_user_highpage(to, from, vaddr, vma)

#define clear_page(page)    memset((void *)(page), 0, PAGE_SIZE)
extern void copy_page(void *to, const void *from);

#define __HAVE_ARCH_GATE_AREA 1

#ifdef CONFIG_ARM_LPAE
#include <asm/pgtable-3level-types.h>
#else
#include <asm/pgtable-2level-types.h>
#endif

#endif /* CONFIG_MMU */

typedef struct page *pgtable_t;

#ifdef CONFIG_HAVE_ARCH_PFN_VALID
extern int pfn_valid(unsigned long);
#endif

#include <asm/memory.h>

#endif /* !__ASSEMBLY__ */

#define VM_DATA_DEFAULT_FLAGS \
    (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \
     VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

#include <asm-generic/getorder.h>

#endif