[deliverable/linux.git] / arch / x86 / include / asm / pgtable-2level.h

#ifndef _ASM_X86_PGTABLE_2LEVEL_H
#define _ASM_X86_PGTABLE_2LEVEL_H

#define pte_ERROR(e) \
	pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low)
#define pgd_ERROR(e) \
	pr_err("%s:%d: bad pgd %08lx\n", __FILE__, __LINE__, pgd_val(e))

/*
 * Certain architectures need to do special things when PTEs
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */
static inline void native_set_pte(pte_t *ptep , pte_t pte)
{
	*ptep = pte;
}

static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
{
	*pmdp = pmd;
}

static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
{
	native_set_pte(ptep, pte);
}

static inline void native_pmd_clear(pmd_t *pmdp)
{
	native_set_pmd(pmdp, __pmd(0));
}

static inline void native_pte_clear(struct mm_struct *mm,
				    unsigned long addr, pte_t *xp)
{
	*xp = native_make_pte(0);
}

#ifdef CONFIG_SMP
static inline pte_t native_ptep_get_and_clear(pte_t *xp)
{
	return __pte(xchg(&xp->pte_low, 0));
}
#else
#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
#endif

#ifdef CONFIG_SMP
static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
{
	return __pmd(xchg((pmdval_t *)xp, 0));
}
#else
#define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
#endif

/* Bit manipulation helper on pte/pgoff entry */
static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift,
				      unsigned long mask, unsigned int leftshift)
{
	return ((value >> rightshift) & mask) << leftshift;
}

/*
 * Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken,
 * split up the 29 bits of offset into this range.
 */
#define PTE_FILE_MAX_BITS	29
#define PTE_FILE_SHIFT1		(_PAGE_BIT_PRESENT + 1)
#define PTE_FILE_SHIFT2		(_PAGE_BIT_FILE + 1)
#define PTE_FILE_SHIFT3		(_PAGE_BIT_PROTNONE + 1)
#define PTE_FILE_BITS1		(PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
#define PTE_FILE_BITS2		(PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)

#define PTE_FILE_MASK1		((1U << PTE_FILE_BITS1) - 1)
#define PTE_FILE_MASK2		((1U << PTE_FILE_BITS2) - 1)

#define PTE_FILE_LSHIFT2	(PTE_FILE_BITS1)
#define PTE_FILE_LSHIFT3	(PTE_FILE_BITS1 + PTE_FILE_BITS2)

static __always_inline pgoff_t pte_to_pgoff(pte_t pte)
{
	return (pgoff_t)
		(pte_bitop(pte.pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1,  0)		    +
		 pte_bitop(pte.pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2,  PTE_FILE_LSHIFT2) +
		 pte_bitop(pte.pte_low, PTE_FILE_SHIFT3,           -1UL,  PTE_FILE_LSHIFT3));
}

static __always_inline pte_t pgoff_to_pte(pgoff_t off)
{
	return (pte_t){
		.pte_low =
			pte_bitop(off,                0, PTE_FILE_MASK1,  PTE_FILE_SHIFT1) +
			pte_bitop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2,  PTE_FILE_SHIFT2) +
			pte_bitop(off, PTE_FILE_LSHIFT3,           -1UL,  PTE_FILE_SHIFT3) +
			_PAGE_FILE,
	};
}

/* Encode and de-code a swap entry */
#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)

#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)

#define __swp_type(x)			(((x).val >> (_PAGE_BIT_PRESENT + 1)) \
					 & ((1U << SWP_TYPE_BITS) - 1))
#define __swp_offset(x)			((x).val >> SWP_OFFSET_SHIFT)
#define __swp_entry(type, offset)	((swp_entry_t) { \
					 ((type) << (_PAGE_BIT_PRESENT + 1)) \
					 | ((offset) << SWP_OFFSET_SHIFT) })
#define __pte_to_swp_entry(pte)		((swp_entry_t) { (pte).pte_low })
#define __swp_entry_to_pte(x)		((pte_t) { .pte = (x).val })

#endif /* _ASM_X86_PGTABLE_2LEVEL_H */
Commit	Line	Data
1965aae3 PA	1	#ifndef _ASM_X86_PGTABLE_2LEVEL_H
1965aae3 PA	2	#define _ASM_X86_PGTABLE_2LEVEL_H
1da177e4	3
1da177e4	4	#define pte_ERROR(e) \
c767a54b	5	pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low)
1da177e4	6	#define pgd_ERROR(e) \
c767a54b	7	pr_err("%s:%d: bad pgd %08lx\n", __FILE__, __LINE__, pgd_val(e))
1da177e4 LT	8
	9	/*
	10	* Certain architectures need to do special things when PTEs
	11	* within a page table are directly modified. Thus, the following
	12	* hook is made available.
	13	*/
3dc494e8 JF	14	static inline void native_set_pte(pte_t *ptep , pte_t pte)
	15	{
	16	*ptep = pte;
	17	}
4891645e	18
3dc494e8 JF	19	static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
	20	{
	21	*pmdp = pmd;
	22	}
da181a8b	23
4891645e JF	24	static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
	25	{
	26	native_set_pte(ptep, pte);
	27	}
1da177e4	28
4891645e JF	29	static inline void native_pmd_clear(pmd_t *pmdp)
	30	{
	31	native_set_pmd(pmdp, __pmd(0));
	32	}
6e5882cf	33
65e05d15 JP	34	static inline void native_pte_clear(struct mm_struct *mm,
65e05d15 JP	35	unsigned long addr, pte_t *xp)
c2c1accd	36	{
4891645e	37	*xp = native_make_pte(0);
c2c1accd ZA	38	}
c2c1accd ZA	39
142dd975	40	#ifdef CONFIG_SMP
3dc494e8 JF	41	static inline pte_t native_ptep_get_and_clear(pte_t *xp)
	42	{
	43	return __pte(xchg(&xp->pte_low, 0));
	44	}
142dd975 ZA	45	#else
	46	#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
	47	#endif
6049742d	48
f2d6bfe9 JW	49	#ifdef CONFIG_SMP
	50	static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
	51	{
	52	return __pmd(xchg((pmdval_t *)xp, 0));
	53	}
	54	#else
	55	#define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
	56	#endif
	57
5305ca10 CG	58	/* Bit manipulation helper on pte/pgoff entry */
	59	static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift,
	60	unsigned long mask, unsigned int leftshift)
	61	{
	62	return ((value >> rightshift) & mask) << leftshift;
	63	}
	64
1da177e4	65	/*
1796316a	66	* Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken,
41bb3476	67	* split up the 29 bits of offset into this range.
1da177e4 LT	68	*/
1da177e4 LT	69	#define PTE_FILE_MAX_BITS 29
1796316a	70	#define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1)
1796316a JB	71	#define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1)
1796316a JB	72	#define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1)
1796316a JB	73	#define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
1796316a JB	74	#define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
1da177e4	75
5305ca10 CG	76	#define PTE_FILE_MASK1 ((1U << PTE_FILE_BITS1) - 1)
	77	#define PTE_FILE_MASK2 ((1U << PTE_FILE_BITS2) - 1)
	78
	79	#define PTE_FILE_LSHIFT2 (PTE_FILE_BITS1)
	80	#define PTE_FILE_LSHIFT3 (PTE_FILE_BITS1 + PTE_FILE_BITS2)
	81
	82	static __always_inline pgoff_t pte_to_pgoff(pte_t pte)
	83	{
	84	return (pgoff_t)
	85	(pte_bitop(pte.pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0) +
	86	pte_bitop(pte.pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2) +
	87	pte_bitop(pte.pte_low, PTE_FILE_SHIFT3, -1UL, PTE_FILE_LSHIFT3));
	88	}
	89
	90	static __always_inline pte_t pgoff_to_pte(pgoff_t off)
	91	{
	92	return (pte_t){
	93	.pte_low =
	94	pte_bitop(off, 0, PTE_FILE_MASK1, PTE_FILE_SHIFT1) +
	95	pte_bitop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2) +
	96	pte_bitop(off, PTE_FILE_LSHIFT3, -1UL, PTE_FILE_SHIFT3) +
	97	_PAGE_FILE,
	98	};
	99	}
1da177e4 LT	100
1da177e4 LT	101	/* Encode and de-code a swap entry */
1796316a JB	102	#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
1796316a JB	103	#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
1796316a JB	104
	105	#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
	106
	107	#define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
	108	& ((1U << SWP_TYPE_BITS) - 1))
	109	#define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
	110	#define __swp_entry(type, offset) ((swp_entry_t) { \
	111	((type) << (_PAGE_BIT_PRESENT + 1)) \
	112	\| ((offset) << SWP_OFFSET_SHIFT) })
1da177e4	113	#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
c8e5393a	114	#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
1da177e4	115
1965aae3	116	#endif /* _ASM_X86_PGTABLE_2LEVEL_H */