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

#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
 */

#ifdef __KERNEL__

/* PAGE_SHIFT determines the page size */
#if defined(CONFIG_PAGE_SIZE_4KB)
# define PAGE_SHIFT	12
#elif defined(CONFIG_PAGE_SIZE_8KB)
# define PAGE_SHIFT	13
#elif defined(CONFIG_PAGE_SIZE_64KB)
# define PAGE_SHIFT	16
#else
# error "Bogus kernel page size?"
#endif

#ifdef __ASSEMBLY__
#define PAGE_SIZE	(1 << PAGE_SHIFT)
#else
#define PAGE_SIZE	(1UL << PAGE_SHIFT)
#endif

#define PAGE_MASK	(~(PAGE_SIZE-1))
#define PTE_MASK	PAGE_MASK

#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define HPAGE_SHIFT	16
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
#define HPAGE_SHIFT	18
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
#define HPAGE_SHIFT	20
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
#define HPAGE_SHIFT	22
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
#define HPAGE_SHIFT	26
#endif

#ifdef CONFIG_HUGETLB_PAGE
#define HPAGE_SIZE		(1UL << HPAGE_SHIFT)
#define HPAGE_MASK		(~(HPAGE_SIZE-1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT-PAGE_SHIFT)
#endif

#ifndef __ASSEMBLY__

extern void (*clear_page)(void *to);
extern void (*copy_page)(void *to, void *from);

extern unsigned long shm_align_mask;
extern unsigned long max_low_pfn, min_low_pfn;
extern unsigned long memory_start, memory_end;

#ifdef CONFIG_MMU
extern void clear_page_slow(void *to);
extern void copy_page_slow(void *to, void *from);
#else
extern void clear_page_nommu(void *to);
extern void copy_page_nommu(void *to, void *from);
#endif

#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
	(defined(CONFIG_CPU_SH4) || defined(CONFIG_SH7705_CACHE_32KB))
struct page;
extern void clear_user_page(void *to, unsigned long address, struct page *pg);
extern void copy_user_page(void *to, void *from, unsigned long address, struct page *pg);
extern void __clear_user_page(void *to, void *orig_to);
extern void __copy_user_page(void *to, void *from, void *orig_to);
#else
#define clear_user_page(page, vaddr, pg)	clear_page(page)
#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
#endif

/*
 * These are used to make use of C type-checking..
 */
#ifdef CONFIG_X2TLB
typedef struct { unsigned long pte_low, pte_high; } pte_t;
typedef struct { unsigned long long pgprot; } pgprot_t;
typedef struct { unsigned long long pgd; } pgd_t;
#define pte_val(x) \
	((x).pte_low | ((unsigned long long)(x).pte_high << 32))
#define __pte(x) \
	({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
#else
typedef struct { unsigned long pte_low; } pte_t;
typedef struct { unsigned long pgprot; } pgprot_t;
typedef struct { unsigned long pgd; } pgd_t;
#define pte_val(x)	((x).pte_low)
#define __pte(x) ((pte_t) { (x) } )
#endif

#define pgd_val(x)	((x).pgd)
#define pgprot_val(x)	((x).pgprot)

#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/kernel/vmlinux.lds.S
 *
 * which has the same constant encoded..
 */

#define __MEMORY_START		CONFIG_MEMORY_START
#define __MEMORY_SIZE		CONFIG_MEMORY_SIZE

#define PAGE_OFFSET		CONFIG_PAGE_OFFSET
#define __pa(x)			((unsigned long)(x)-PAGE_OFFSET)
#define __va(x)			((void *)((unsigned long)(x)+PAGE_OFFSET))
#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

#define phys_to_page(phys)	(pfn_to_page(phys >> PAGE_SHIFT))
#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)

/* PFN start number, because of __MEMORY_START */
#define PFN_START		(__MEMORY_START >> PAGE_SHIFT)
#define ARCH_PFN_OFFSET		(PFN_START)
#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#ifdef CONFIG_FLATMEM
#define pfn_valid(pfn)		((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
#endif
#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#define VM_DATA_DEFAULT_FLAGS	(VM_READ | VM_WRITE | VM_EXEC | \
				 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)

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

/* vDSO support */
#ifdef CONFIG_VSYSCALL
#define __HAVE_ARCH_GATE_AREA
#endif

/*
 * Slub defaults to 8-byte alignment, we're only interested in 4.
 * Slab defaults to BYTES_PER_WORD, which ends up being the same anyways.
 */
#define ARCH_KMALLOC_MINALIGN	4
#define ARCH_SLAB_MINALIGN	4

#endif /* __KERNEL__ */
#endif /* __ASM_SH_PAGE_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef __ASM_SH_PAGE_H
	2	#define __ASM_SH_PAGE_H
	3
	4	/*
	5	* Copyright (C) 1999 Niibe Yutaka
	6	*/
	7
	8	/*
	9	[ P0/U0 (virtual) ] 0x00000000 <------ User space
	10	[ P1 (fixed) cached ] 0x80000000 <------ Kernel space
	11	[ P2 (fixed) non-cachable] 0xA0000000 <------ Physical access
	12	[ P3 (virtual) cached] 0xC0000000 <------ vmalloced area
	13	[ P4 control ] 0xE0000000
	14	*/
	15
a5ba7d54 PM	16	#ifdef __KERNEL__
a5ba7d54 PM	17
1da177e4	18	/* PAGE_SHIFT determines the page size */
21440cf0 PM	19	#if defined(CONFIG_PAGE_SIZE_4KB)
	20	# define PAGE_SHIFT 12
	21	#elif defined(CONFIG_PAGE_SIZE_8KB)
	22	# define PAGE_SHIFT 13
	23	#elif defined(CONFIG_PAGE_SIZE_64KB)
	24	# define PAGE_SHIFT 16
	25	#else
	26	# error "Bogus kernel page size?"
	27	#endif
8c12b5dc PM	28
8c12b5dc PM	29	#ifdef __ASSEMBLY__
d153ea88	30	#define PAGE_SIZE (1 << PAGE_SHIFT)
8c12b5dc PM	31	#else
	32	#define PAGE_SIZE (1UL << PAGE_SHIFT)
	33	#endif
	34
1da177e4 LT	35	#define PAGE_MASK (~(PAGE_SIZE-1))
	36	#define PTE_MASK PAGE_MASK
	37
	38	#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
	39	#define HPAGE_SHIFT 16
21440cf0 PM	40	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_256K)
21440cf0 PM	41	#define HPAGE_SHIFT 18
1da177e4 LT	42	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
1da177e4 LT	43	#define HPAGE_SHIFT 20
21440cf0 PM	44	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_4MB)
	45	#define HPAGE_SHIFT 22
	46	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_64MB)
	47	#define HPAGE_SHIFT 26
1da177e4 LT	48	#endif
	49
	50	#ifdef CONFIG_HUGETLB_PAGE
	51	#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
	52	#define HPAGE_MASK (~(HPAGE_SIZE-1))
	53	#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
	54	#endif
	55
1da177e4 LT	56	#ifndef __ASSEMBLY__
	57
	58	extern void (clear_page)(void to);
	59	extern void (copy_page)(void to, void *from);
	60
f3c25758	61	extern unsigned long shm_align_mask;
01066625	62	extern unsigned long max_low_pfn, min_low_pfn;
e08f457c	63	extern unsigned long memory_start, memory_end;
f3c25758	64
e96636cc	65	#ifdef CONFIG_MMU
1da177e4 LT	66	extern void clear_page_slow(void *to);
1da177e4 LT	67	extern void copy_page_slow(void to, void from);
e96636cc YS	68	#else
	69	extern void clear_page_nommu(void *to);
	70	extern void copy_page_nommu(void to, void from);
	71	#endif
1da177e4	72
e7bd34a1 PM	73	#if !defined(CONFIG_CACHE_OFF) && defined(CONFIG_MMU) && \
e7bd34a1 PM	74	(defined(CONFIG_CPU_SH4) \|\| defined(CONFIG_SH7705_CACHE_32KB))
1da177e4 LT	75	struct page;
	76	extern void clear_user_page(void to, unsigned long address, struct page pg);
	77	extern void copy_user_page(void to, void from, unsigned long address, struct page *pg);
	78	extern void __clear_user_page(void to, void orig_to);
	79	extern void __copy_user_page(void to, void from, void *orig_to);
e7bd34a1	80	#else
1da177e4 LT	81	#define clear_user_page(page, vaddr, pg) clear_page(page)
1da177e4 LT	82	#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
1da177e4 LT	83	#endif
	84
	85	/*
	86	* These are used to make use of C type-checking..
	87	*/
21440cf0 PM	88	#ifdef CONFIG_X2TLB
	89	typedef struct { unsigned long pte_low, pte_high; } pte_t;
	90	typedef struct { unsigned long long pgprot; } pgprot_t;
d04a0f79	91	typedef struct { unsigned long long pgd; } pgd_t;
21440cf0 PM	92	#define pte_val(x) \
	93	((x).pte_low \| ((unsigned long long)(x).pte_high << 32))
	94	#define __pte(x) \
	95	({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
	96	#else
	97	typedef struct { unsigned long pte_low; } pte_t;
1da177e4	98	typedef struct { unsigned long pgprot; } pgprot_t;
d04a0f79	99	typedef struct { unsigned long pgd; } pgd_t;
21440cf0 PM	100	#define pte_val(x) ((x).pte_low)
	101	#define __pte(x) ((pte_t) { (x) } )
	102	#endif
	103
1da177e4 LT	104	#define pgd_val(x) ((x).pgd)
	105	#define pgprot_val(x) ((x).pgprot)
	106
1da177e4 LT	107	#define __pgd(x) ((pgd_t) { (x) } )
	108	#define __pgprot(x) ((pgprot_t) { (x) } )
	109
	110	#endif /* !__ASSEMBLY__ */
	111
	112	/* to align the pointer to the (next) page boundary */
	113	#define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
	114
	115	/*
	116	* IF YOU CHANGE THIS, PLEASE ALSO CHANGE
	117	*
	118	* arch/sh/kernel/vmlinux.lds.S
	119	*
	120	* which has the same constant encoded..
	121	*/
	122
	123	#define __MEMORY_START CONFIG_MEMORY_START
	124	#define __MEMORY_SIZE CONFIG_MEMORY_SIZE
1da177e4	125
e7f93a35	126	#define PAGE_OFFSET CONFIG_PAGE_OFFSET
1da177e4 LT	127	#define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
1da177e4 LT	128	#define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
01066625	129	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
1da177e4	130
01066625 PM	131	#define phys_to_page(phys) (pfn_to_page(phys >> PAGE_SHIFT))
01066625 PM	132	#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
1da177e4 LT	133
	134	/* PFN start number, because of __MEMORY_START */
	135	#define PFN_START (__MEMORY_START >> PAGE_SHIFT)
67bb2c69	136	#define ARCH_PFN_OFFSET (PFN_START)
1da177e4	137	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
5900711a	138	#ifdef CONFIG_FLATMEM
01066625	139	#define pfn_valid(pfn) ((pfn) >= min_low_pfn && (pfn) < max_low_pfn)
5900711a	140	#endif
1da177e4 LT	141	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
	142
	143	#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| VM_EXEC \| \
	144	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)
	145
104b8dea	146	#include <asm-generic/memory_model.h>
fd4fd5aa SR	147	#include <asm-generic/page.h>
fd4fd5aa SR	148
19f9a34f PM	149	/* vDSO support */
	150	#ifdef CONFIG_VSYSCALL
	151	#define __HAVE_ARCH_GATE_AREA
	152	#endif
	153
cbd2d9d8 PM	154	/*
	155	* Slub defaults to 8-byte alignment, we're only interested in 4.
	156	* Slab defaults to BYTES_PER_WORD, which ends up being the same anyways.
	157	*/
	158	#define ARCH_KMALLOC_MINALIGN 4
	159	#define ARCH_SLAB_MINALIGN 4
	160
b5233d07	161	#endif /* __KERNEL__ */
1da177e4	162	#endif /* __ASM_SH_PAGE_H */