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

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 */
#ifndef _ASM_PAGE_H
#define _ASM_PAGE_H

#include <spaces.h>

/*
 * PAGE_SHIFT determines the page size
 */
#ifdef CONFIG_PAGE_SIZE_4KB
#define PAGE_SHIFT	12
#endif
#ifdef CONFIG_PAGE_SIZE_8KB
#define PAGE_SHIFT	13
#endif
#ifdef CONFIG_PAGE_SIZE_16KB
#define PAGE_SHIFT	14
#endif
#ifdef CONFIG_PAGE_SIZE_64KB
#define PAGE_SHIFT	16
#endif
#define PAGE_SIZE	(1UL << PAGE_SHIFT)
#define PAGE_MASK       (~((1 << PAGE_SHIFT) - 1))

#ifndef __ASSEMBLY__

#include <linux/pfn.h>
#include <asm/io.h>

/*
 * It's normally defined only for FLATMEM config but it's
 * used in our early mem init code for all memory models.
 * So always define it.
 */
#define ARCH_PFN_OFFSET		PFN_UP(PHYS_OFFSET)

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

extern unsigned long shm_align_mask;

static inline unsigned long pages_do_alias(unsigned long addr1,
	unsigned long addr2)
{
	return (addr1 ^ addr2) & shm_align_mask;
}

struct page;

static inline void clear_user_page(void *addr, unsigned long vaddr,
	struct page *page)
{
	extern void (*flush_data_cache_page)(unsigned long addr);

	clear_page(addr);
	if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
		flush_data_cache_page((unsigned long)addr);
}

extern void copy_user_page(void *vto, void *vfrom, unsigned long vaddr,
	struct page *to);
struct vm_area_struct;
extern void copy_user_highpage(struct page *to, struct page *from,
	unsigned long vaddr, struct vm_area_struct *vma);

#define __HAVE_ARCH_COPY_USER_HIGHPAGE

/*
 * These are used to make use of C type-checking..
 */
#ifdef CONFIG_64BIT_PHYS_ADDR
  #ifdef CONFIG_CPU_MIPS32
    typedef struct { unsigned long pte_low, pte_high; } pte_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 long pte; } pte_t;
     #define pte_val(x)	((x).pte)
     #define __pte(x)	((pte_t) { (x) } )
  #endif
#else
typedef struct { unsigned long pte; } pte_t;
#define pte_val(x)	((x).pte)
#define __pte(x)	((pte_t) { (x) } )
#endif
typedef struct page *pgtable_t;

/*
 * For 3-level pagetables we defines these ourselves, for 2-level the
 * definitions are supplied by <asm-generic/pgtable-nopmd.h>.
 */
#ifdef CONFIG_64BIT

typedef struct { unsigned long pmd; } pmd_t;
#define pmd_val(x)	((x).pmd)
#define __pmd(x)	((pmd_t) { (x) } )

#endif

/*
 * Right now we don't support 4-level pagetables, so all pud-related
 * definitions come from <asm-generic/pgtable-nopud.h>.
 */

/*
 * Finall the top of the hierarchy, the pgd
 */
typedef struct { unsigned long pgd; } pgd_t;
#define pgd_val(x)	((x).pgd)
#define __pgd(x)	((pgd_t) { (x) } )

/*
 * Manipulate page protection bits
 */
typedef struct { unsigned long pgprot; } pgprot_t;
#define pgprot_val(x)	((x).pgprot)
#define __pgprot(x)	((pgprot_t) { (x) } )

/*
 * On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
 * pair of pages we only have a single global bit per pair of pages.  When
 * writing to the TLB make sure we always have the bit set for both pages
 * or none.  This macro is used to access the `buddy' of the pte we're just
 * working on.
 */
#define ptep_buddy(x)	((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))

#endif /* !__ASSEMBLY__ */

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

/*
 * __pa()/__va() should be used only during mem init.
 */
#ifdef CONFIG_64BIT
#define __pa(x)								\
({									\
    unsigned long __x = (unsigned long)(x);				\
    __x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x);			\
})
#else
#define __pa(x)								\
    ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
#endif
#define __va(x)		((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
#define __pa_symbol(x)	__pa(RELOC_HIDE((unsigned long)(x), 0))

#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

#ifdef CONFIG_FLATMEM

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

#elif defined(CONFIG_SPARSEMEM)

/* pfn_valid is defined in linux/mmzone.h */

#elif defined(CONFIG_NEED_MULTIPLE_NODES)

#define pfn_valid(pfn)							\
({									\
	unsigned long __pfn = (pfn);					\
	int __n = pfn_to_nid(__pfn);					\
	((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn +		\
	                       NODE_DATA(__n)->node_spanned_pages)	\
	            : 0);						\
})

#endif

#define virt_to_page(kaddr)	pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
#define virt_addr_valid(kaddr)	pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))

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

#define UNCAC_ADDR(addr)	((addr) - PAGE_OFFSET + UNCAC_BASE)
#define CAC_ADDR(addr)		((addr) - UNCAC_BASE + PAGE_OFFSET)

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

#endif /* _ASM_PAGE_H */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1994 - 1999, 2000, 03 Ralf Baechle
	7	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	8	*/
	9	#ifndef _ASM_PAGE_H
	10	#define _ASM_PAGE_H
	11
1da177e4 LT	12	#include <spaces.h>
1da177e4 LT	13
1da177e4 LT	14	/*
	15	* PAGE_SHIFT determines the page size
	16	*/
	17	#ifdef CONFIG_PAGE_SIZE_4KB
	18	#define PAGE_SHIFT 12
	19	#endif
	20	#ifdef CONFIG_PAGE_SIZE_8KB
	21	#define PAGE_SHIFT 13
	22	#endif
	23	#ifdef CONFIG_PAGE_SIZE_16KB
	24	#define PAGE_SHIFT 14
	25	#endif
	26	#ifdef CONFIG_PAGE_SIZE_64KB
	27	#define PAGE_SHIFT 16
	28	#endif
	29	#define PAGE_SIZE (1UL << PAGE_SHIFT)
	30	#define PAGE_MASK (~((1 << PAGE_SHIFT) - 1))
	31
1da177e4 LT	32	#ifndef __ASSEMBLY__
1da177e4 LT	33
41b0483e	34	#include <linux/pfn.h>
b1c65b39	35	#include <asm/io.h>
6f284a2c FBH	36
	37	/*
	38	* It's normally defined only for FLATMEM config but it's
	39	* used in our early mem init code for all memory models.
	40	* So always define it.
	41	*/
	42	#define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET)
	43
1da177e4 LT	44	extern void clear_page(void * page);
	45	extern void copy_page(void * to, void * from);
	46
	47	extern unsigned long shm_align_mask;
	48
	49	static inline unsigned long pages_do_alias(unsigned long addr1,
	50	unsigned long addr2)
	51	{
	52	return (addr1 ^ addr2) & shm_align_mask;
	53	}
	54
	55	struct page;
	56
	57	static inline void clear_user_page(void *addr, unsigned long vaddr,
	58	struct page *page)
	59	{
	60	extern void (*flush_data_cache_page)(unsigned long addr);
	61
	62	clear_page(addr);
585fa724	63	if (pages_do_alias((unsigned long) addr, vaddr & PAGE_MASK))
1da177e4 LT	64	flush_data_cache_page((unsigned long)addr);
	65	}
	66
bcd02280 AN	67	extern void copy_user_page(void vto, void vfrom, unsigned long vaddr,
	68	struct page *to);
	69	struct vm_area_struct;
	70	extern void copy_user_highpage(struct page to, struct page from,
	71	unsigned long vaddr, struct vm_area_struct *vma);
1da177e4	72
bcd02280	73	#define __HAVE_ARCH_COPY_USER_HIGHPAGE
1da177e4 LT	74
	75	/*
	76	* These are used to make use of C type-checking..
	77	*/
	78	#ifdef CONFIG_64BIT_PHYS_ADDR
ec917c2c	79	#ifdef CONFIG_CPU_MIPS32
1da177e4 LT	80	typedef struct { unsigned long pte_low, pte_high; } pte_t;
1da177e4 LT	81	#define pte_val(x) ((x).pte_low \| ((unsigned long long)(x).pte_high << 32))
d34555fb	82	#define __pte(x) ({ pte_t __pte = {(x), ((unsigned long long)(x)) >> 32}; __pte; })
1da177e4 LT	83	#else
	84	typedef struct { unsigned long long pte; } pte_t;
	85	#define pte_val(x) ((x).pte)
d34555fb	86	#define __pte(x) ((pte_t) { (x) } )
1da177e4 LT	87	#endif
	88	#else
	89	typedef struct { unsigned long pte; } pte_t;
	90	#define pte_val(x) ((x).pte)
c6e8b587	91	#define __pte(x) ((pte_t) { (x) } )
d34555fb	92	#endif
2f569afd	93	typedef struct page *pgtable_t;
1da177e4	94
c6e8b587 RB	95	/*
	96	* For 3-level pagetables we defines these ourselves, for 2-level the
	97	* definitions are supplied by <asm-generic/pgtable-nopmd.h>.
	98	*/
	99	#ifdef CONFIG_64BIT
1da177e4	100
c6e8b587	101	typedef struct { unsigned long pmd; } pmd_t;
1da177e4	102	#define pmd_val(x) ((x).pmd)
c6e8b587	103	#define __pmd(x) ((pmd_t) { (x) } )
1da177e4	104
c6e8b587	105	#endif
1da177e4	106
c6e8b587 RB	107	/*
	108	* Right now we don't support 4-level pagetables, so all pud-related
	109	* definitions come from <asm-generic/pgtable-nopud.h>.
	110	*/
	111
	112	/*
	113	* Finall the top of the hierarchy, the pgd
	114	*/
	115	typedef struct { unsigned long pgd; } pgd_t;
	116	#define pgd_val(x) ((x).pgd)
1da177e4	117	#define __pgd(x) ((pgd_t) { (x) } )
c6e8b587 RB	118
	119	/*
	120	* Manipulate page protection bits
	121	*/
	122	typedef struct { unsigned long pgprot; } pgprot_t;
	123	#define pgprot_val(x) ((x).pgprot)
1da177e4 LT	124	#define __pgprot(x) ((pgprot_t) { (x) } )
1da177e4 LT	125
c6e8b587 RB	126	/*
	127	* On R4000-style MMUs where a TLB entry is mapping a adjacent even / odd
	128	* pair of pages we only have a single global bit per pair of pages. When
	129	* writing to the TLB make sure we always have the bit set for both pages
	130	* or none. This macro is used to access the `buddy' of the pte we're just
	131	* working on.
	132	*/
	133	#define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t)))
	134
1da177e4 LT	135	#endif /* !__ASSEMBLY__ */
	136
	137	/* to align the pointer to the (next) page boundary */
	138	#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
	139
6f284a2c FBH	140	/*
	141	* __pa()/__va() should be used only during mem init.
	142	*/
f4fae826	143	#ifdef CONFIG_64BIT
b1c65b39 FBH	144	#define __pa(x) \
	145	({ \
	146	unsigned long __x = (unsigned long)(x); \
	147	__x < CKSEG0 ? XPHYSADDR(__x) : CPHYSADDR(__x); \
	148	})
620a4802	149	#else
b1c65b39 FBH	150	#define __pa(x) \
b1c65b39 FBH	151	((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
620a4802	152	#endif
6f284a2c	153	#define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET))
21a151d8	154	#define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x), 0))
1da177e4 LT	155
	156	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
	157
e53639d8 RB	158	#ifdef CONFIG_FLATMEM
e53639d8 RB	159
6f284a2c	160	#define pfn_valid(pfn) ((pfn) >= ARCH_PFN_OFFSET && (pfn) < max_mapnr)
e53639d8	161
7de58fab AN	162	#elif defined(CONFIG_SPARSEMEM)
	163
	164	/* pfn_valid is defined in linux/mmzone.h */
	165
e53639d8 RB	166	#elif defined(CONFIG_NEED_MULTIPLE_NODES)
	167
	168	#define pfn_valid(pfn) \
	169	({ \
	170	unsigned long __pfn = (pfn); \
	171	int __n = pfn_to_nid(__pfn); \
	172	((__n >= 0) ? (__pfn < NODE_DATA(__n)->node_start_pfn + \
	173	NODE_DATA(__n)->node_spanned_pages) \
	174	: 0); \
	175	})
	176
e53639d8 RB	177	#endif
e53639d8 RB	178
99e3b942 FBH	179	#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(virt_to_phys(kaddr)))
99e3b942 FBH	180	#define virt_addr_valid(kaddr) pfn_valid(PFN_DOWN(virt_to_phys(kaddr)))
1da177e4 LT	181
	182	#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| VM_EXEC \| \
	183	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC)
	184
	185	#define UNCAC_ADDR(addr) ((addr) - PAGE_OFFSET + UNCAC_BASE)
	186	#define CAC_ADDR(addr) ((addr) - UNCAC_BASE + PAGE_OFFSET)
	187
a02036e7	188	#include <asm-generic/memory_model.h>
fd4fd5aa SR	189	#include <asm-generic/page.h>
fd4fd5aa SR	190
1da177e4	191	#endif /* _ASM_PAGE_H */