Viewing file:  page.h (3.06 KB) -rw-r--r--
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#ifndef __ASM_SH_PAGE_H
#define __ASM_SH_PAGE_H
/*
* Copyright (C) 1999 Niibe Yutaka
*/
/*
[ P0/U0 (virtual) ] 0x00000000 <------ User space
[ P1 (fixed) cached ] 0x80000000 <------ Kernel space
[ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
[ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
[ P4 control ] 0xE0000000
*/
#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))
#define PTE_MASK PAGE_MASK
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
extern void clear_page(void *to);
extern void copy_page(void *to, void *from);
#if defined(__sh3__)
#define clear_user_page(page, vaddr) clear_page(page)
#define copy_user_page(to, from, vaddr) copy_page(to, from)
#elif defined(__SH4__)
extern void clear_user_page(void *to, unsigned long address);
extern void copy_user_page(void *to, void *from, unsigned long address);
extern void __clear_user_page(void *to, void *orig_to);
extern void __copy_user_page(void *to, void *from, void *orig_to);
#endif
/*
* 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 __pmd(x) ((pmd_t) { (x) } )
#define __pgd(x) ((pgd_t) { (x) } )
#define __pgprot(x) ((pgprot_t) { (x) } )
#endif /* !__ASSEMBLY__ */
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
/*
* IF YOU CHANGE THIS, PLEASE ALSO CHANGE
*
* arch/sh/vmlinux.lds.S
*
* which has the same constant encoded..
*/
#define __MEMORY_START CONFIG_MEMORY_START
#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
#ifdef CONFIG_DISCONTIGMEM
/* Just for HP690, for now.. */
#define __MEMORY_START_2ND (__MEMORY_START+0x02000000)
#define __MEMORY_SIZE_2ND 0x001000000 /* 16MB */
#endif
#define PAGE_OFFSET (0x80000000UL)
#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
#ifndef CONFIG_DISCONTIGMEM
#define phys_to_page(phys) (mem_map + (((phys)-__MEMORY_START) >> PAGE_SHIFT))
#define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
#define page_to_phys(page) (((page - mem_map) << PAGE_SHIFT) + __MEMORY_START)
#endif
#define virt_to_page(kaddr) phys_to_page(__pa(kaddr))
#ifndef __ASSEMBLY__
/*
* Tell the user there is some problem.
*/
#define BUG() do { \
printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
asm volatile("nop"); \
} while (0)
#define PAGE_BUG(page) do { \
BUG(); \
} while (0)
/* 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;
}
#endif
#endif /* __KERNEL__ */
#endif /* __ASM_SH_PAGE_H */
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