[linux-2.6-block.git] / include / asm-generic / page.h

#ifndef __ASM_GENERIC_PAGE_H
#define __ASM_GENERIC_PAGE_H
/*
 * Generic page.h implementation, for NOMMU architectures.
 * This provides the dummy definitions for the memory management.
 */

#ifdef CONFIG_MMU
#error need to prove a real asm/page.h
#endif


/* PAGE_SHIFT determines the page size */

#define PAGE_SHIFT	12
#ifdef __ASSEMBLY__
#define PAGE_SIZE	(1 << PAGE_SHIFT)
#else
#define PAGE_SIZE	(1UL << PAGE_SHIFT)
#endif
#define PAGE_MASK	(~(PAGE_SIZE-1))

#include <asm/setup.h>

#ifndef __ASSEMBLY__

#define clear_page(page)	memset((page), 0, PAGE_SIZE)
#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)

#define clear_user_page(page, vaddr, pg)	clear_page(page)
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)

/*
 * These are used to make use of C type-checking..
 */
typedef struct {
	unsigned long pte;
} pte_t;
typedef struct {
	unsigned long pmd[16];
} pmd_t;
typedef struct {
	unsigned long pgd;
} pgd_t;
typedef struct {
	unsigned long pgprot;
} pgprot_t;
typedef struct page *pgtable_t;

#define pte_val(x)	((x).pte)
#define pmd_val(x)	((&x)->pmd[0])
#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) } )

extern unsigned long memory_start;
extern unsigned long memory_end;

#endif /* !__ASSEMBLY__ */

#ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS
#define PAGE_OFFSET		(CONFIG_KERNEL_RAM_BASE_ADDRESS)
#else
#define PAGE_OFFSET		(0)
#endif

#ifndef ARCH_PFN_OFFSET
#define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)
#endif

#ifndef __ASSEMBLY__

#define __va(x) ((void *)((unsigned long) (x)))
#define __pa(x) ((unsigned long) (x))

#define virt_to_pfn(kaddr)	(__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_virt(pfn)	__va((pfn) << PAGE_SHIFT)

#define virt_to_page(addr)	pfn_to_page(virt_to_pfn(addr))
#define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))

#ifndef page_to_phys
#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
#endif

#define pfn_valid(pfn)		((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)

#define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
				((void *)(kaddr) < (void *)memory_end))

#endif /* __ASSEMBLY__ */

#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>

#endif /* __ASM_GENERIC_PAGE_H */
Commit	Line	Data
5c01b46b AB	1	#ifndef __ASM_GENERIC_PAGE_H
	2	#define __ASM_GENERIC_PAGE_H
	3	/*
	4	* Generic page.h implementation, for NOMMU architectures.
	5	* This provides the dummy definitions for the memory management.
	6	*/
	7
	8	#ifdef CONFIG_MMU
	9	#error need to prove a real asm/page.h
	10	#endif
	11
	12
	13	/* PAGE_SHIFT determines the page size */
	14
	15	#define PAGE_SHIFT 12
	16	#ifdef __ASSEMBLY__
	17	#define PAGE_SIZE (1 << PAGE_SHIFT)
	18	#else
	19	#define PAGE_SIZE (1UL << PAGE_SHIFT)
	20	#endif
	21	#define PAGE_MASK (~(PAGE_SIZE-1))
	22
	23	#include <asm/setup.h>
	24
	25	#ifndef __ASSEMBLY__
	26
5c01b46b AB	27	#define clear_page(page) memset((page), 0, PAGE_SIZE)
	28	#define copy_page(to,from) memcpy((to), (from), PAGE_SIZE)
	29
	30	#define clear_user_page(page, vaddr, pg) clear_page(page)
	31	#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
	32
	33	/*
	34	* These are used to make use of C type-checking..
	35	*/
	36	typedef struct {
	37	unsigned long pte;
	38	} pte_t;
	39	typedef struct {
	40	unsigned long pmd[16];
	41	} pmd_t;
	42	typedef struct {
	43	unsigned long pgd;
	44	} pgd_t;
	45	typedef struct {
	46	unsigned long pgprot;
	47	} pgprot_t;
	48	typedef struct page *pgtable_t;
	49
	50	#define pte_val(x) ((x).pte)
	51	#define pmd_val(x) ((&x)->pmd[0])
	52	#define pgd_val(x) ((x).pgd)
	53	#define pgprot_val(x) ((x).pgprot)
	54
	55	#define __pte(x) ((pte_t) { (x) } )
	56	#define __pmd(x) ((pmd_t) { (x) } )
	57	#define __pgd(x) ((pgd_t) { (x) } )
	58	#define __pgprot(x) ((pgprot_t) { (x) } )
	59
	60	extern unsigned long memory_start;
	61	extern unsigned long memory_end;
	62
	63	#endif /* !__ASSEMBLY__ */
	64
	65	#ifdef CONFIG_KERNEL_RAM_BASE_ADDRESS
	66	#define PAGE_OFFSET (CONFIG_KERNEL_RAM_BASE_ADDRESS)
	67	#else
	68	#define PAGE_OFFSET (0)
	69	#endif
	70
b7a0556e MS	71	#ifndef ARCH_PFN_OFFSET
	72	#define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT)
	73	#endif
	74
5c01b46b AB	75	#ifndef __ASSEMBLY__
5c01b46b AB	76
b7a0556e MS	77	#define __va(x) ((void *)((unsigned long) (x)))
b7a0556e MS	78	#define __pa(x) ((unsigned long) (x))
5c01b46b AB	79
	80	#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
	81	#define pfn_to_virt(pfn) __va((pfn) << PAGE_SHIFT)
	82
06d5e032 SZ	83	#define virt_to_page(addr) pfn_to_page(virt_to_pfn(addr))
06d5e032 SZ	84	#define page_to_virt(page) pfn_to_virt(page_to_pfn(page))
5c01b46b AB	85
	86	#ifndef page_to_phys
	87	#define page_to_phys(page) ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
	88	#endif
	89
b7a0556e	90	#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && ((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
5c01b46b AB	91
	92	#define virt_addr_valid(kaddr) (((void )(kaddr) >= (void )PAGE_OFFSET) && \
	93	((void )(kaddr) < (void )memory_end))
	94
	95	#endif /* __ASSEMBLY__ */
	96
	97	#include <asm-generic/memory_model.h>
	98	#include <asm-generic/getorder.h>
	99
	100	#endif /* __ASM_GENERIC_PAGE_H */