page.h

这是一个SIGMA方案的PMP播放器的UCLINUX程序,可播放DVD,VCD,CD MP3...有很好的参考价值.

#ifndef _ASMARM_PAGE_H
#define _ASMARM_PAGE_H

#include <asm/proc/page.h>

#define PAGE_SIZE       (1UL << PAGE_SHIFT)
#define PAGE_MASK       (~(PAGE_SIZE-1))

/*
 * MAP_NR -- given an address, calculate the index of the page struct which
 * points to the address's page.
 * --gmcnutt
 */
#define MAP_NR(addr) (((unsigned long)(addr) - PHYS_OFFSET) >> PAGE_SHIFT)

#ifdef __KERNEL__
#ifndef __ASSEMBLY__

#define STRICT_MM_TYPECHECKS

#define clear_page(page)	memzero((void *)(page), PAGE_SIZE)
extern void copy_page(void *to, void *from);

#define clear_user_page(page, vaddr)	clear_page(page)
#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 __pmd(x)        (x)
#define __pgd(x)        (x)
#define __pgprot(x)     (x)

#endif
#endif /* !__ASSEMBLY__ */

/* to align the pointer to the (next) page boundary */
#define PAGE_ALIGN(addr)	(((addr)+PAGE_SIZE-1)&PAGE_MASK)

#ifndef __ASSEMBLY__

extern void __bug(const char *file, int line, void *data);

#define BUG()		__bug(__FILE__, __LINE__, NULL)
#define PAGE_BUG(page)	__bug(__FILE__, __LINE__, page)

/* 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__ */

#include <linux/config.h>
#include <asm/arch/memory.h>

#define __pa(x)			__virt_to_phys(x)
#define __va(x)			__phys_to_virt(x)

#ifndef CONFIG_DISCONTIGMEM

/*
 * virt_to_page -- given an address, find the page structure whose virtual field
 * points to the address's page #. 'mem_map' (see linux/mm.h) points to the
 * first page struct.
 * --gmcnutt
 */
#define virt_to_page(kaddr) (mem_map +  MAP_NR(kaddr))
#define VALID_PAGE(page) ((page - mem_map) < max_mapnr)
#endif

#endif

#endif