Viewing file:  page.h (2.39 KB) -rw-r--r--
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#ifndef _ALPHA_PAGE_H
#define _ALPHA_PAGE_H
#include <asm/pal.h>
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 13
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
#ifdef __KERNEL__
#ifndef __ASSEMBLY__
#define STRICT_MM_TYPECHECKS
extern void clear_page(void *page);
#define clear_user_page(page, vaddr) clear_page(page)
extern void copy_page(void * _to, void * _from);
#define copy_user_page(to, from, vaddr) copy_page(to, 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 __pmd(x) ((pmd_t) { (x) } )
#define __pgd(x) ((pgd_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;
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 __pgd(x) (x)
#define __pgprot(x) (x)
#endif /* STRICT_MM_TYPECHECKS */
#define BUG() \
do { \
printk("kernel BUG at %s:%d!\n", __FILE__, __LINE__); \
__asm__ __volatile__("call_pal %0 # bugchk" : : "i" (PAL_bugchk)); \
} while (0)
#define PAGE_BUG(page) BUG()
/* Pure 2^n version of get_order */
extern __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 /* !__ASSEMBLY__ */
/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
#ifdef USE_48_BIT_KSEG
#define PAGE_OFFSET 0xffff800000000000
#else
#define PAGE_OFFSET 0xfffffc0000000000
#endif
#define __pa(x) ((unsigned long) (x) - PAGE_OFFSET)
#define __va(x) ((void *)((unsigned long) (x) + PAGE_OFFSET))
#ifndef CONFIG_DISCONTIGMEM
#define virt_to_page(kaddr) (mem_map + (__pa(kaddr) >> PAGE_SHIFT))
#define VALID_PAGE(page) (((page) - mem_map) < max_mapnr)
#endif /* CONFIG_DISCONTIGMEM */
#endif /* __KERNEL__ */
#endif /* _ALPHA_PAGE_H */
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