[linux-2.6-block.git] / arch / blackfin / include / asm / pgtable.h

/*
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later.
 */

#ifndef _BLACKFIN_PGTABLE_H
#define _BLACKFIN_PGTABLE_H

#include <asm-generic/4level-fixup.h>

#include <asm/page.h>
#include <asm/def_LPBlackfin.h>

typedef pte_t *pte_addr_t;
/*
* Trivial page table functions.
*/
#define pgd_present(pgd)	(1)
#define pgd_none(pgd)		(0)
#define pgd_bad(pgd)		(0)
#define pgd_clear(pgdp)
#define kern_addr_valid(addr)	(1)

#define pmd_offset(a, b)	((void *)0)
#define pmd_none(x)		(!pmd_val(x))
#define pmd_present(x)		(pmd_val(x))
#define pmd_clear(xp)		do { set_pmd(xp, __pmd(0)); } while (0)
#define pmd_bad(x)		(pmd_val(x) & ~PAGE_MASK)

#define kern_addr_valid(addr) (1)

#define PAGE_NONE		__pgprot(0)	/* these mean nothing to NO_MM */
#define PAGE_SHARED		__pgprot(0)	/* these mean nothing to NO_MM */
#define PAGE_COPY		__pgprot(0)	/* these mean nothing to NO_MM */
#define PAGE_READONLY		__pgprot(0)	/* these mean nothing to NO_MM */
#define PAGE_KERNEL		__pgprot(0)	/* these mean nothing to NO_MM */
#define pgprot_noncached(prot)	(prot)

extern void paging_init(void);

#define __swp_type(x)		(0)
#define __swp_offset(x)		(0)
#define __swp_entry(typ,off)	((swp_entry_t) { ((typ) | ((off) << 7)) })
#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)	((pte_t) { (x).val })

#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)

/*
 * Page assess control based on Blackfin CPLB management
 */
#define _PAGE_RD	(CPLB_USER_RD)
#define _PAGE_WR	(CPLB_USER_WR)
#define _PAGE_USER	(CPLB_USER_RD | CPLB_USER_WR)
#define _PAGE_ACCESSED	CPLB_ALL_ACCESS
#define _PAGE_DIRTY	(CPLB_DIRTY)

#define PTE_BIT_FUNC(fn, op) \
	static inline pte_t pte_##fn(pte_t _pte) { _pte.pte op; return _pte; }

PTE_BIT_FUNC(rdprotect, &= ~_PAGE_RD);
PTE_BIT_FUNC(mkread, |= _PAGE_RD);
PTE_BIT_FUNC(wrprotect, &= ~_PAGE_WR);
PTE_BIT_FUNC(mkwrite, |= _PAGE_WR);
PTE_BIT_FUNC(exprotect, &= ~_PAGE_USER);
PTE_BIT_FUNC(mkexec, |= _PAGE_USER);
PTE_BIT_FUNC(mkclean, &= ~_PAGE_DIRTY);
PTE_BIT_FUNC(mkdirty, |= _PAGE_DIRTY);
PTE_BIT_FUNC(mkold, &= ~_PAGE_ACCESSED);
PTE_BIT_FUNC(mkyoung, |= _PAGE_ACCESSED);

/*
 * ZERO_PAGE is a global shared page that is always zero: used
 * for zero-mapped memory areas etc..
 */
#define ZERO_PAGE(vaddr)	virt_to_page(empty_zero_page)
extern char empty_zero_page[];

#define swapper_pg_dir ((pgd_t *) 0)
/*
 * No page table caches to initialise.
 */
#define pgtable_cache_init()	do { } while (0)

/*
 * All 32bit addresses are effectively valid for vmalloc...
 * Sort of meaningless for non-VM targets.
 */
#define	VMALLOC_START	0
#define	VMALLOC_END	0xffffffff

/* provide a special get_unmapped_area for framebuffer mmaps of nommu */
extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
					  unsigned long, unsigned long,
					  unsigned long);
#define HAVE_ARCH_FB_UNMAPPED_AREA

#include <asm-generic/pgtable.h>

#endif				/* _BLACKFIN_PGTABLE_H */
Commit	Line	Data
96f1050d RG	1	/*
	2	* Copyright 2004-2009 Analog Devices Inc.
	3	*
	4	* Licensed under the GPL-2 or later.
	5	*/
	6
1394f032 BW	7	#ifndef _BLACKFIN_PGTABLE_H
	8	#define _BLACKFIN_PGTABLE_H
	9
	10	#include <asm-generic/4level-fixup.h>
	11
	12	#include <asm/page.h>
639f6571	13	#include <asm/def_LPBlackfin.h>
1394f032 BW	14
	15	typedef pte_t *pte_addr_t;
	16	/*
	17	* Trivial page table functions.
	18	*/
	19	#define pgd_present(pgd) (1)
	20	#define pgd_none(pgd) (0)
	21	#define pgd_bad(pgd) (0)
	22	#define pgd_clear(pgdp)
	23	#define kern_addr_valid(addr) (1)
	24
	25	#define pmd_offset(a, b) ((void *)0)
	26	#define pmd_none(x) (!pmd_val(x))
	27	#define pmd_present(x) (pmd_val(x))
	28	#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
	29	#define pmd_bad(x) (pmd_val(x) & ~PAGE_MASK)
	30
	31	#define kern_addr_valid(addr) (1)
	32
	33	#define PAGE_NONE __pgprot(0) /* these mean nothing to NO_MM */
	34	#define PAGE_SHARED __pgprot(0) /* these mean nothing to NO_MM */
	35	#define PAGE_COPY __pgprot(0) /* these mean nothing to NO_MM */
	36	#define PAGE_READONLY __pgprot(0) /* these mean nothing to NO_MM */
	37	#define PAGE_KERNEL __pgprot(0) /* these mean nothing to NO_MM */
2377feb4	38	#define pgprot_noncached(prot) (prot)
1394f032 BW	39
	40	extern void paging_init(void);
	41
	42	#define __swp_type(x) (0)
	43	#define __swp_offset(x) (0)
	44	#define __swp_entry(typ,off) ((swp_entry_t) { ((typ) \| ((off) << 7)) })
	45	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	46	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	47
1394f032 BW	48	#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
	49	#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
	50
	51	/*
	52	* Page assess control based on Blackfin CPLB management
	53	*/
	54	#define _PAGE_RD (CPLB_USER_RD)
	55	#define _PAGE_WR (CPLB_USER_WR)
	56	#define _PAGE_USER (CPLB_USER_RD \| CPLB_USER_WR)
	57	#define _PAGE_ACCESSED CPLB_ALL_ACCESS
	58	#define _PAGE_DIRTY (CPLB_DIRTY)
	59
	60	#define PTE_BIT_FUNC(fn, op) \
	61	static inline pte_t pte_##fn(pte_t _pte) { _pte.pte op; return _pte; }
	62
	63	PTE_BIT_FUNC(rdprotect, &= ~_PAGE_RD);
	64	PTE_BIT_FUNC(mkread, \|= _PAGE_RD);
	65	PTE_BIT_FUNC(wrprotect, &= ~_PAGE_WR);
	66	PTE_BIT_FUNC(mkwrite, \|= _PAGE_WR);
	67	PTE_BIT_FUNC(exprotect, &= ~_PAGE_USER);
	68	PTE_BIT_FUNC(mkexec, \|= _PAGE_USER);
	69	PTE_BIT_FUNC(mkclean, &= ~_PAGE_DIRTY);
	70	PTE_BIT_FUNC(mkdirty, \|= _PAGE_DIRTY);
	71	PTE_BIT_FUNC(mkold, &= ~_PAGE_ACCESSED);
	72	PTE_BIT_FUNC(mkyoung, \|= _PAGE_ACCESSED);
	73
	74	/*
	75	* ZERO_PAGE is a global shared page that is always zero: used
	76	* for zero-mapped memory areas etc..
	77	*/
f074e48e MF	78	#define ZERO_PAGE(vaddr) virt_to_page(empty_zero_page)
f074e48e MF	79	extern char empty_zero_page[];
1394f032	80
1394f032 BW	81	#define swapper_pg_dir ((pgd_t *) 0)
	82	/*
	83	* No page table caches to initialise.
	84	*/
	85	#define pgtable_cache_init() do { } while (0)
1394f032 BW	86
	87	/*
	88	* All 32bit addresses are effectively valid for vmalloc...
	89	* Sort of meaningless for non-VM targets.
	90	*/
	91	#define VMALLOC_START 0
	92	#define VMALLOC_END 0xffffffff
	93
59bd00c8 TC	94	/* provide a special get_unmapped_area for framebuffer mmaps of nommu */
	95	extern unsigned long get_fb_unmapped_area(struct file *filp, unsigned long,
	96	unsigned long, unsigned long,
	97	unsigned long);
	98	#define HAVE_ARCH_FB_UNMAPPED_AREA
	99
1394f032 BW	100	#include <asm-generic/pgtable.h>
	101
	102	#endif /* _BLACKFIN_PGTABLE_H */