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/*
* linux/include/asm-arm/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
#include <linux/config.h>
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 12
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#ifdef __KERNEL__
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
#ifndef __ASSEMBLY__
#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:
* v3 - ARMv3
* v4wt - ARMv4 with writethrough cache, without minicache
* v4wb - ARMv4 with writeback cache, without minicache
* v4_mc - ARMv4 with minicache
* xscale - Xscale
*/
#undef _USER
#undef MULTI_USER
#ifdef CONFIG_CPU_COPY_V3
# ifdef _USER
# define MULTI_USER 1
# else
# define _USER v3
# endif
#endif
#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_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_COPY_V6
# define MULTI_USER 1
#endif
#if !defined(_USER) && !defined(MULTI_USER)
#error Unknown user operations model
#endif
struct cpu_user_fns {
void (*cpu_clear_user_page)(void *p, unsigned long user);
void (*cpu_copy_user_page)(void *to, const void *from,
unsigned long user);
};
#ifdef MULTI_USER
extern struct cpu_user_fns cpu_user;
#define __cpu_clear_user_page cpu_user.cpu_clear_user_page
#define __cpu_copy_user_page cpu_user.cpu_copy_user_page
#else
#define __cpu_clear_user_page __glue(_USER,_clear_user_page)
#define __cpu_copy_user_page __glue(_USER,_copy_user_page)
extern void __cpu_clear_user_page(void *p, unsigned long user);
extern void __cpu_copy_user_page(void *to, const void *from,
unsigned long user);
#endif
#define clear_user_page(addr,vaddr,pg) \
do { \
preempt_disable(); \
__cpu_clear_user_page(addr, vaddr); \
preempt_enable(); \
} while (0)
#define copy_user_page(to,from,vaddr,pg) \
do { \
preempt_disable(); \
__cpu_copy_user_page(to, from, vaddr); \
preempt_enable(); \
} while (0)
#define clear_page(page) memzero((void *)(page), PAGE_SIZE)
extern void copy_page(void *to, const void *from);
#undef STRICT_MM_TYPECHECKS
#ifdef STRICT_MM_TYPECHECKS
/*
* These are used to make use of C type-checking..
*/
typedef struct { unsigned long pte; } pte_t;
typedef struct { unsigned long pmd; } pmd_t;
typedef struct { unsigned long pgd[2]; } pgd_t;
typedef struct { unsigned long pgprot; } pgprot_t;
#define pte_val(x) ((x).pte)
#define pmd_val(x) ((x).pmd)
#define pgd_val(x) ((x).pgd[0])
#define pgprot_val(x) ((x).pgprot)
#define __pte(x) ((pte_t) { (x) } )
#define __pmd(x) ((pmd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
#else
/*
* .. while these make it easier on the compiler
*/
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t[2];
typedef unsigned long pgprot_t;
#define pte_val(x) (x)
#define pmd_val(x) (x)
#define pgd_val(x) ((x)[0])
#define pgprot_val(x) (x)
#define __pte(x) (x)
#define __pmd(x) (x)
#define __pgprot(x) (x)
#endif /* STRICT_MM_TYPECHECKS */
/* the upper-most page table pointer */
extern pmd_t *top_pmd;
/* Pure 2^n version of get_order */
static inline int get_order(unsigned long size)
{
int order;
size = (size-1) >> (PAGE_SHIFT-1);
order = -1;
do {
size >>= 1;
order++;
} while (size);
return order;
}
#include <asm/memory.h>
#endif /* !__ASSEMBLY__ */
#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | VM_EXEC | \
VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
#endif /* __KERNEL__ */
#endif
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