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#ifndef _ALPHA_PAGE_H
#define _ALPHA_PAGE_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
/*
* A _lot_ of the kernel time is spent clearing pages, so
* do this as fast as we possibly can. Also, doing this
* as a separate inline function (rather than memset())
* results in clearer kernel profiles as we see _who_ is
* doing page clearing or copying.
*/
static inline void clear_page(void * page)
{
unsigned long count = PAGE_SIZE/64;
unsigned long *ptr = (unsigned long *)page;
do {
ptr[0] = 0;
ptr[1] = 0;
ptr[2] = 0;
ptr[3] = 0;
count--;
ptr[4] = 0;
ptr[5] = 0;
ptr[6] = 0;
ptr[7] = 0;
ptr += 8;
} while (count);
}
#define clear_user_page(page, vaddr) clear_page(page)
static inline void copy_page(void * _to, void * _from)
{
unsigned long count = PAGE_SIZE/64;
unsigned long *to = (unsigned long *)_to;
unsigned long *from = (unsigned long *)_from;
do {
unsigned long a,b,c,d,e,f,g,h;
a = from[0];
b = from[1];
c = from[2];
d = from[3];
e = from[4];
f = from[5];
g = from[6];
h = from[7];
count--;
from += 8;
to[0] = a;
to[1] = b;
to[2] = c;
to[3] = d;
to[4] = e;
to[5] = f;
to[6] = g;
to[7] = h;
to += 8;
} while (count);
}
#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 __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() __asm__ __volatile__("call_pal 129 # bugchk")
#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))
#define MAP_NR(addr) (__pa(addr) >> PAGE_SHIFT)
#endif /* __KERNEL__ */
#endif /* _ALPHA_PAGE_H */
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