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/* $Id: page.h,v 1.3 1998/07/13 23:29:09 tsbogend Exp $
*
* Definitions for page handling
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 1994 - 1998 by Ralf Baechle
*/
#ifndef __ASM_MIPS_PAGE_H
#define __ASM_MIPS_PAGE_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__
#define STRICT_MM_TYPECHECKS
#ifndef _LANGUAGE_ASSEMBLY
#ifdef __SMP__
#define ULOCK_DECLARE extern spinlock_t user_page_lock;
#else
#define ULOCK_DECLARE
#endif
struct upcache {
struct page *list;
unsigned long count;
};
extern struct upcache user_page_cache[8];
#define USER_PAGE_WATER 16
extern unsigned long get_user_page_slow(int which);
extern unsigned long user_page_colours, user_page_order;
#define get_user_page(__vaddr) \
({ \
ULOCK_DECLARE \
int which = ((__vaddr) >> PAGE_SHIFT) & user_page_colours; \
struct upcache *up = &user_page_cache[which]; \
struct page *p; \
unsigned long ret; \
spin_lock(&user_page_lock); \
if((p = up->list) != NULL) { \
up->list = p->next; \
up->count--; \
} \
spin_unlock(&user_page_lock); \
if(p != NULL) \
ret = PAGE_OFFSET+PAGE_SIZE*p->map_nr; \
else \
ret = get_user_page_slow(which); \
ret; \
})
#define free_user_page(__page, __addr) \
do { \
ULOCK_DECLARE \
int which = ((__addr) >> PAGE_SHIFT) & user_page_colours; \
struct upcache *up = &user_page_cache[which]; \
if(atomic_read(&(__page)->count) == 1 && \
up->count < USER_PAGE_WATER) { \
spin_lock(&user_page_lock); \
(__page)->age = PAGE_INITIAL_AGE; \
(__page)->next = up->list; \
up->list = (__page); \
up->count++; \
spin_unlock(&user_page_lock); \
} else \
free_page(__addr); \
} while(0)
extern void (*clear_page)(unsigned long page);
extern void (*copy_page)(unsigned long to, unsigned long from);
#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; } 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)
#define pgprot_val(x) ((x).pgprot)
#define __pte(x) ((pte_t) { (x) } )
#define __pme(x) ((pme_t) { (x) } )
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
#else /* !defined (STRICT_MM_TYPECHECKS) */
/*
* .. while these make it easier on the compiler
*/
typedef unsigned long pte_t;
typedef unsigned long pmd_t;
typedef unsigned long pgd_t;
typedef unsigned long pgprot_t;
#define pte_val(x) (x)
#define pmd_val(x) (x)
#define pgd_val(x) (x)
#define pgprot_val(x) (x)
#define __pte(x) (x)
#define __pmd(x) (x)
#define __pgd(x) (x)
#define __pgprot(x) (x)
#endif /* !defined (STRICT_MM_TYPECHECKS) */
#endif /* _LANGUAGE_ASSEMBLY */
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
/*
* This handles the memory map.
* We handle pages at KSEG0 for kernels with 32 bit address space.
*/
#define PAGE_OFFSET 0x80000000UL
#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
#define MAP_MASK 0x1fffffffUL
#define MAP_NR(addr) ((((unsigned long)(addr)) & MAP_MASK) >> PAGE_SHIFT)
#endif /* defined (__KERNEL__) */
#endif /* __ASM_MIPS_PAGE_H */
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