[deliverable/linux.git] / arch / arm / include / asm / pgtable-3level.h

/*
 * arch/arm/include/asm/pgtable-3level.h
 *
 * Copyright (C) 2011 ARM Ltd.
 * Author: Catalin Marinas <catalin.marinas@arm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
#ifndef _ASM_PGTABLE_3LEVEL_H
#define _ASM_PGTABLE_3LEVEL_H

/*
 * With LPAE, there are 3 levels of page tables. Each level has 512 entries of
 * 8 bytes each, occupying a 4K page. The first level table covers a range of
 * 512GB, each entry representing 1GB. Since we are limited to 4GB input
 * address range, only 4 entries in the PGD are used.
 *
 * There are enough spare bits in a page table entry for the kernel specific
 * state.
 */
#define PTRS_PER_PTE		512
#define PTRS_PER_PMD		512
#define PTRS_PER_PGD		4

#define PTE_HWTABLE_PTRS	(0)
#define PTE_HWTABLE_OFF		(0)
#define PTE_HWTABLE_SIZE	(PTRS_PER_PTE * sizeof(u64))

/*
 * PGDIR_SHIFT determines the size a top-level page table entry can map.
 */
#define PGDIR_SHIFT		30

/*
 * PMD_SHIFT determines the size a middle-level page table entry can map.
 */
#define PMD_SHIFT		21

#define PMD_SIZE		(1UL << PMD_SHIFT)
#define PMD_MASK		(~((1 << PMD_SHIFT) - 1))
#define PGDIR_SIZE		(1UL << PGDIR_SHIFT)
#define PGDIR_MASK		(~((1 << PGDIR_SHIFT) - 1))

/*
 * section address mask and size definitions.
 */
#define SECTION_SHIFT		21
#define SECTION_SIZE		(1UL << SECTION_SHIFT)
#define SECTION_MASK		(~((1 << SECTION_SHIFT) - 1))

#define USER_PTRS_PER_PGD	(PAGE_OFFSET / PGDIR_SIZE)

/*
 * Hugetlb definitions.
 */
#define HPAGE_SHIFT		PMD_SHIFT
#define HPAGE_SIZE		(_AC(1, UL) << HPAGE_SHIFT)
#define HPAGE_MASK		(~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)

/*
 * "Linux" PTE definitions for LPAE.
 *
 * These bits overlap with the hardware bits but the naming is preserved for
 * consistency with the classic page table format.
 */
#define L_PTE_VALID		(_AT(pteval_t, 1) << 0)		/* Valid */
#define L_PTE_PRESENT		(_AT(pteval_t, 3) << 0)		/* Present */
#define L_PTE_USER		(_AT(pteval_t, 1) << 6)		/* AP[1] */
#define L_PTE_SHARED		(_AT(pteval_t, 3) << 8)		/* SH[1:0], inner shareable */
#define L_PTE_YOUNG		(_AT(pteval_t, 1) << 10)	/* AF */
#define L_PTE_XN		(_AT(pteval_t, 1) << 54)	/* XN */
#define L_PTE_DIRTY		(_AT(pteval_t, 1) << 55)
#define L_PTE_SPECIAL		(_AT(pteval_t, 1) << 56)
#define L_PTE_NONE		(_AT(pteval_t, 1) << 57)	/* PROT_NONE */
#define L_PTE_RDONLY		(_AT(pteval_t, 1) << 58)	/* READ ONLY */

#define L_PMD_SECT_VALID	(_AT(pmdval_t, 1) << 0)
#define L_PMD_SECT_DIRTY	(_AT(pmdval_t, 1) << 55)
#define L_PMD_SECT_SPLITTING	(_AT(pmdval_t, 1) << 56)
#define L_PMD_SECT_NONE		(_AT(pmdval_t, 1) << 57)
#define L_PMD_SECT_RDONLY	(_AT(pteval_t, 1) << 58)

/*
 * To be used in assembly code with the upper page attributes.
 */
#define L_PTE_XN_HIGH		(1 << (54 - 32))
#define L_PTE_DIRTY_HIGH	(1 << (55 - 32))

/*
 * AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
 */
#define L_PTE_MT_UNCACHED	(_AT(pteval_t, 0) << 2)	/* strongly ordered */
#define L_PTE_MT_BUFFERABLE	(_AT(pteval_t, 1) << 2)	/* normal non-cacheable */
#define L_PTE_MT_WRITETHROUGH	(_AT(pteval_t, 2) << 2)	/* normal inner write-through */
#define L_PTE_MT_WRITEBACK	(_AT(pteval_t, 3) << 2)	/* normal inner write-back */
#define L_PTE_MT_WRITEALLOC	(_AT(pteval_t, 7) << 2)	/* normal inner write-alloc */
#define L_PTE_MT_DEV_SHARED	(_AT(pteval_t, 4) << 2)	/* device */
#define L_PTE_MT_DEV_NONSHARED	(_AT(pteval_t, 4) << 2)	/* device */
#define L_PTE_MT_DEV_WC		(_AT(pteval_t, 1) << 2)	/* normal non-cacheable */
#define L_PTE_MT_DEV_CACHED	(_AT(pteval_t, 3) << 2)	/* normal inner write-back */
#define L_PTE_MT_MASK		(_AT(pteval_t, 7) << 2)

/*
 * Software PGD flags.
 */
#define L_PGD_SWAPPER		(_AT(pgdval_t, 1) << 55)	/* swapper_pg_dir entry */

/*
 * 2nd stage PTE definitions for LPAE.
 */
#define L_PTE_S2_MT_UNCACHED		(_AT(pteval_t, 0x0) << 2) /* strongly ordered */
#define L_PTE_S2_MT_WRITETHROUGH	(_AT(pteval_t, 0xa) << 2) /* normal inner write-through */
#define L_PTE_S2_MT_WRITEBACK		(_AT(pteval_t, 0xf) << 2) /* normal inner write-back */
#define L_PTE_S2_MT_DEV_SHARED		(_AT(pteval_t, 0x1) << 2) /* device */
#define L_PTE_S2_MT_MASK		(_AT(pteval_t, 0xf) << 2)

#define L_PTE_S2_RDONLY			(_AT(pteval_t, 1) << 6)   /* HAP[1]   */
#define L_PTE_S2_RDWR			(_AT(pteval_t, 3) << 6)   /* HAP[2:1] */

#define L_PMD_S2_RDONLY			(_AT(pmdval_t, 1) << 6)   /* HAP[1]   */
#define L_PMD_S2_RDWR			(_AT(pmdval_t, 3) << 6)   /* HAP[2:1] */

/*
 * Hyp-mode PL2 PTE definitions for LPAE.
 */
#define L_PTE_HYP		L_PTE_USER

#ifndef __ASSEMBLY__

#define pud_none(pud)		(!pud_val(pud))
#define pud_bad(pud)		(!(pud_val(pud) & 2))
#define pud_present(pud)	(pud_val(pud))
#define pmd_table(pmd)		((pmd_val(pmd) & PMD_TYPE_MASK) == \
						 PMD_TYPE_TABLE)
#define pmd_sect(pmd)		((pmd_val(pmd) & PMD_TYPE_MASK) == \
						 PMD_TYPE_SECT)
#define pmd_large(pmd)		pmd_sect(pmd)

#define pud_clear(pudp)			\
	do {				\
		*pudp = __pud(0);	\
		clean_pmd_entry(pudp);	\
	} while (0)

#define set_pud(pudp, pud)		\
	do {				\
		*pudp = pud;		\
		flush_pmd_entry(pudp);	\
	} while (0)

static inline pmd_t *pud_page_vaddr(pud_t pud)
{
	return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
}

/* Find an entry in the second-level page table.. */
#define pmd_index(addr)		(((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
{
	return (pmd_t *)pud_page_vaddr(*pud) + pmd_index(addr);
}

#define pmd_bad(pmd)		(!(pmd_val(pmd) & 2))

#define copy_pmd(pmdpd,pmdps)		\
	do {				\
		*pmdpd = *pmdps;	\
		flush_pmd_entry(pmdpd);	\
	} while (0)

#define pmd_clear(pmdp)			\
	do {				\
		*pmdp = __pmd(0);	\
		clean_pmd_entry(pmdp);	\
	} while (0)

/*
 * For 3 levels of paging the PTE_EXT_NG bit will be set for user address ptes
 * that are written to a page table but not for ptes created with mk_pte.
 *
 * In hugetlb_no_page, a new huge pte (new_pte) is generated and passed to
 * hugetlb_cow, where it is compared with an entry in a page table.
 * This comparison test fails erroneously leading ultimately to a memory leak.
 *
 * To correct this behaviour, we mask off PTE_EXT_NG for any pte that is
 * present before running the comparison.
 */
#define __HAVE_ARCH_PTE_SAME
#define pte_same(pte_a,pte_b)	((pte_present(pte_a) ? pte_val(pte_a) & ~PTE_EXT_NG	\
					: pte_val(pte_a))				\
				== (pte_present(pte_b) ? pte_val(pte_b) & ~PTE_EXT_NG	\
					: pte_val(pte_b)))

#define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,__pte(pte_val(pte)|(ext)))

#define pte_huge(pte)		(pte_val(pte) && !(pte_val(pte) & PTE_TABLE_BIT))
#define pte_mkhuge(pte)		(__pte(pte_val(pte) & ~PTE_TABLE_BIT))

#define pmd_isset(pmd, val)	((u32)(val) == (val) ? pmd_val(pmd) & (val) \
						: !!(pmd_val(pmd) & (val)))
#define pmd_isclear(pmd, val)	(!(pmd_val(pmd) & (val)))

#define pmd_young(pmd)		(pmd_isset((pmd), PMD_SECT_AF))
#define pte_special(pte)	(pte_isset((pte), L_PTE_SPECIAL))
static inline pte_t pte_mkspecial(pte_t pte)
{
	pte_val(pte) |= L_PTE_SPECIAL;
	return pte;
}
#define	__HAVE_ARCH_PTE_SPECIAL

#define __HAVE_ARCH_PMD_WRITE
#define pmd_write(pmd)		(pmd_isclear((pmd), L_PMD_SECT_RDONLY))
#define pmd_dirty(pmd)		(pmd_isset((pmd), L_PMD_SECT_DIRTY))
#define pud_page(pud)		pmd_page(__pmd(pud_val(pud)))
#define pud_write(pud)		pmd_write(__pmd(pud_val(pud)))

#define pmd_hugewillfault(pmd)	(!pmd_young(pmd) || !pmd_write(pmd))
#define pmd_thp_or_huge(pmd)	(pmd_huge(pmd) || pmd_trans_huge(pmd))

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
#define pmd_trans_huge(pmd)	(pmd_val(pmd) && !pmd_table(pmd))
#define pmd_trans_splitting(pmd) (pmd_isset((pmd), L_PMD_SECT_SPLITTING))

#ifdef CONFIG_HAVE_RCU_TABLE_FREE
#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
			  pmd_t *pmdp);
#endif
#endif

#define PMD_BIT_FUNC(fn,op) \
static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; }

PMD_BIT_FUNC(wrprotect,	|= L_PMD_SECT_RDONLY);
PMD_BIT_FUNC(mkold,	&= ~PMD_SECT_AF);
PMD_BIT_FUNC(mksplitting, |= L_PMD_SECT_SPLITTING);
PMD_BIT_FUNC(mkwrite,   &= ~L_PMD_SECT_RDONLY);
PMD_BIT_FUNC(mkdirty,   |= L_PMD_SECT_DIRTY);
PMD_BIT_FUNC(mkyoung,   |= PMD_SECT_AF);

#define pmd_mkhuge(pmd)		(__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))

#define pmd_pfn(pmd)		(((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
#define pfn_pmd(pfn,prot)	(__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))
#define mk_pmd(page,prot)	pfn_pmd(page_to_pfn(page),prot)

/* represent a notpresent pmd by zero, this is used by pmdp_invalidate */
static inline pmd_t pmd_mknotpresent(pmd_t pmd)
{
	return __pmd(0);
}

static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
	const pmdval_t mask = PMD_SECT_USER | PMD_SECT_XN | L_PMD_SECT_RDONLY |
				L_PMD_SECT_VALID | L_PMD_SECT_NONE;
	pmd_val(pmd) = (pmd_val(pmd) & ~mask) | (pgprot_val(newprot) & mask);
	return pmd;
}

static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
			      pmd_t *pmdp, pmd_t pmd)
{
	BUG_ON(addr >= TASK_SIZE);

	/* create a faulting entry if PROT_NONE protected */
	if (pmd_val(pmd) & L_PMD_SECT_NONE)
		pmd_val(pmd) &= ~L_PMD_SECT_VALID;

	if (pmd_write(pmd) && pmd_dirty(pmd))
		pmd_val(pmd) &= ~PMD_SECT_AP2;
	else
		pmd_val(pmd) |= PMD_SECT_AP2;

	*pmdp = __pmd(pmd_val(pmd) | PMD_SECT_nG);
	flush_pmd_entry(pmdp);
}

static inline int has_transparent_hugepage(void)
{
	return 1;
}

#endif /* __ASSEMBLY__ */

#endif /* _ASM_PGTABLE_3LEVEL_H */
Commit	Line	Data
dcfdae04 CM	1	/*
	2	* arch/arm/include/asm/pgtable-3level.h
	3	*
	4	* Copyright (C) 2011 ARM Ltd.
	5	* Author: Catalin Marinas <catalin.marinas@arm.com>
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	19	*/
	20	#ifndef _ASM_PGTABLE_3LEVEL_H
	21	#define _ASM_PGTABLE_3LEVEL_H
	22
	23	/*
	24	* With LPAE, there are 3 levels of page tables. Each level has 512 entries of
	25	* 8 bytes each, occupying a 4K page. The first level table covers a range of
	26	* 512GB, each entry representing 1GB. Since we are limited to 4GB input
	27	* address range, only 4 entries in the PGD are used.
	28	*
	29	* There are enough spare bits in a page table entry for the kernel specific
	30	* state.
	31	*/
	32	#define PTRS_PER_PTE 512
	33	#define PTRS_PER_PMD 512
	34	#define PTRS_PER_PGD 4
	35
e38a5175	36	#define PTE_HWTABLE_PTRS (0)
dcfdae04 CM	37	#define PTE_HWTABLE_OFF (0)
	38	#define PTE_HWTABLE_SIZE (PTRS_PER_PTE * sizeof(u64))
	39
	40	/*
	41	* PGDIR_SHIFT determines the size a top-level page table entry can map.
	42	*/
	43	#define PGDIR_SHIFT 30
	44
	45	/*
	46	* PMD_SHIFT determines the size a middle-level page table entry can map.
	47	*/
	48	#define PMD_SHIFT 21
	49
	50	#define PMD_SIZE (1UL << PMD_SHIFT)
926edcc7	51	#define PMD_MASK (~((1 << PMD_SHIFT) - 1))
dcfdae04	52	#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
926edcc7	53	#define PGDIR_MASK (~((1 << PGDIR_SHIFT) - 1))
dcfdae04 CM	54
	55	/*
	56	* section address mask and size definitions.
	57	*/
	58	#define SECTION_SHIFT 21
	59	#define SECTION_SIZE (1UL << SECTION_SHIFT)
926edcc7	60	#define SECTION_MASK (~((1 << SECTION_SHIFT) - 1))
dcfdae04 CM	61
	62	#define USER_PTRS_PER_PGD (PAGE_OFFSET / PGDIR_SIZE)
	63
1355e2a6 CM	64	/*
	65	* Hugetlb definitions.
	66	*/
	67	#define HPAGE_SHIFT PMD_SHIFT
	68	#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
	69	#define HPAGE_MASK (~(HPAGE_SIZE - 1))
	70	#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
	71
dcfdae04 CM	72	/*
	73	* "Linux" PTE definitions for LPAE.
	74	*
	75	* These bits overlap with the hardware bits but the naming is preserved for
	76	* consistency with the classic page table format.
	77	*/
dbf62d50 WD	78	#define L_PTE_VALID (_AT(pteval_t, 1) << 0) /* Valid */
dbf62d50 WD	79	#define L_PTE_PRESENT (_AT(pteval_t, 3) << 0) /* Present */
dcfdae04	80	#define L_PTE_USER (_AT(pteval_t, 1) << 6) /* AP[1] */
dcfdae04 CM	81	#define L_PTE_SHARED (_AT(pteval_t, 3) << 8) /* SH[1:0], inner shareable */
	82	#define L_PTE_YOUNG (_AT(pteval_t, 1) << 10) /* AF */
	83	#define L_PTE_XN (_AT(pteval_t, 1) << 54) /* XN */
ded94779 SC	84	#define L_PTE_DIRTY (_AT(pteval_t, 1) << 55)
ded94779 SC	85	#define L_PTE_SPECIAL (_AT(pteval_t, 1) << 56)
26ffd0d4	86	#define L_PTE_NONE (_AT(pteval_t, 1) << 57) /* PROT_NONE */
ded94779	87	#define L_PTE_RDONLY (_AT(pteval_t, 1) << 58) /* READ ONLY */
dcfdae04	88
ded94779 SC	89	#define L_PMD_SECT_VALID (_AT(pmdval_t, 1) << 0)
	90	#define L_PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55)
	91	#define L_PMD_SECT_SPLITTING (_AT(pmdval_t, 1) << 56)
	92	#define L_PMD_SECT_NONE (_AT(pmdval_t, 1) << 57)
	93	#define L_PMD_SECT_RDONLY (_AT(pteval_t, 1) << 58)
8d962507	94
dcfdae04 CM	95	/*
	96	* To be used in assembly code with the upper page attributes.
	97	*/
	98	#define L_PTE_XN_HIGH (1 << (54 - 32))
	99	#define L_PTE_DIRTY_HIGH (1 << (55 - 32))
	100
	101	/*
	102	* AttrIndx[2:0] encoding (mapping attributes defined in the MAIR* registers).
	103	*/
	104	#define L_PTE_MT_UNCACHED (_AT(pteval_t, 0) << 2) /* strongly ordered */
	105	#define L_PTE_MT_BUFFERABLE (_AT(pteval_t, 1) << 2) /* normal non-cacheable */
	106	#define L_PTE_MT_WRITETHROUGH (_AT(pteval_t, 2) << 2) /* normal inner write-through */
	107	#define L_PTE_MT_WRITEBACK (_AT(pteval_t, 3) << 2) /* normal inner write-back */
	108	#define L_PTE_MT_WRITEALLOC (_AT(pteval_t, 7) << 2) /* normal inner write-alloc */
	109	#define L_PTE_MT_DEV_SHARED (_AT(pteval_t, 4) << 2) /* device */
	110	#define L_PTE_MT_DEV_NONSHARED (_AT(pteval_t, 4) << 2) /* device */
	111	#define L_PTE_MT_DEV_WC (_AT(pteval_t, 1) << 2) /* normal non-cacheable */
	112	#define L_PTE_MT_DEV_CACHED (_AT(pteval_t, 3) << 2) /* normal inner write-back */
	113	#define L_PTE_MT_MASK (_AT(pteval_t, 7) << 2)
	114
da028779 CM	115	/*
	116	* Software PGD flags.
	117	*/
	118	#define L_PGD_SWAPPER (_AT(pgdval_t, 1) << 55) /* swapper_pg_dir entry */
	119
cc577c26 CD	120	/*
	121	* 2nd stage PTE definitions for LPAE.
	122	*/
4d9c5b89 CD	123	#define L_PTE_S2_MT_UNCACHED (_AT(pteval_t, 0x0) << 2) /* strongly ordered */
	124	#define L_PTE_S2_MT_WRITETHROUGH (_AT(pteval_t, 0xa) << 2) /* normal inner write-through */
	125	#define L_PTE_S2_MT_WRITEBACK (_AT(pteval_t, 0xf) << 2) /* normal inner write-back */
	126	#define L_PTE_S2_MT_DEV_SHARED (_AT(pteval_t, 0x1) << 2) /* device */
	127	#define L_PTE_S2_MT_MASK (_AT(pteval_t, 0xf) << 2)
cc577c26	128
4d9c5b89 CD	129	#define L_PTE_S2_RDONLY (_AT(pteval_t, 1) << 6) /* HAP[1] */
	130	#define L_PTE_S2_RDWR (_AT(pteval_t, 3) << 6) /* HAP[2:1] */
	131
c6473555	132	#define L_PMD_S2_RDONLY (_AT(pmdval_t, 1) << 6) /* HAP[1] */
4d9c5b89	133	#define L_PMD_S2_RDWR (_AT(pmdval_t, 3) << 6) /* HAP[2:1] */
ad361f09	134
cc577c26 CD	135	/*
	136	* Hyp-mode PL2 PTE definitions for LPAE.
	137	*/
	138	#define L_PTE_HYP L_PTE_USER
	139
da028779 CM	140	#ifndef __ASSEMBLY__
	141
	142	#define pud_none(pud) (!pud_val(pud))
	143	#define pud_bad(pud) (!(pud_val(pud) & 2))
	144	#define pud_present(pud) (pud_val(pud))
cc577c26 CD	145	#define pmd_table(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
	146	PMD_TYPE_TABLE)
	147	#define pmd_sect(pmd) ((pmd_val(pmd) & PMD_TYPE_MASK) == \
	148	PMD_TYPE_SECT)
1fd15b87	149	#define pmd_large(pmd) pmd_sect(pmd)
da028779 CM	150
	151	#define pud_clear(pudp) \
	152	do { \
	153	*pudp = __pud(0); \
	154	clean_pmd_entry(pudp); \
	155	} while (0)
	156
	157	#define set_pud(pudp, pud) \
	158	do { \
	159	*pudp = pud; \
	160	flush_pmd_entry(pudp); \
	161	} while (0)
	162
	163	static inline pmd_t *pud_page_vaddr(pud_t pud)
	164	{
	165	return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
	166	}
	167
	168	/* Find an entry in the second-level page table.. */
	169	#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
	170	static inline pmd_t pmd_offset(pud_t pud, unsigned long addr)
	171	{
	172	return (pmd_t )pud_page_vaddr(pud) + pmd_index(addr);
	173	}
	174
	175	#define pmd_bad(pmd) (!(pmd_val(pmd) & 2))
	176
	177	#define copy_pmd(pmdpd,pmdps) \
	178	do { \
	179	pmdpd = pmdps; \
	180	flush_pmd_entry(pmdpd); \
	181	} while (0)
	182
	183	#define pmd_clear(pmdp) \
	184	do { \
	185	*pmdp = __pmd(0); \
	186	clean_pmd_entry(pmdp); \
	187	} while (0)
	188
dde1b651 SC	189	/*
	190	* For 3 levels of paging the PTE_EXT_NG bit will be set for user address ptes
	191	* that are written to a page table but not for ptes created with mk_pte.
	192	*
	193	* In hugetlb_no_page, a new huge pte (new_pte) is generated and passed to
	194	* hugetlb_cow, where it is compared with an entry in a page table.
	195	* This comparison test fails erroneously leading ultimately to a memory leak.
	196	*
	197	* To correct this behaviour, we mask off PTE_EXT_NG for any pte that is
	198	* present before running the comparison.
	199	*/
	200	#define __HAVE_ARCH_PTE_SAME
	201	#define pte_same(pte_a,pte_b) ((pte_present(pte_a) ? pte_val(pte_a) & ~PTE_EXT_NG \
	202	: pte_val(pte_a)) \
	203	== (pte_present(pte_b) ? pte_val(pte_b) & ~PTE_EXT_NG \
	204	: pte_val(pte_b)))
	205
da028779 CM	206	#define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,__pte(pte_val(pte)\|(ext)))
da028779 CM	207
1355e2a6 CM	208	#define pte_huge(pte) (pte_val(pte) && !(pte_val(pte) & PTE_TABLE_BIT))
	209	#define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT))
	210
f2950706 SC	211	#define pmd_isset(pmd, val) ((u32)(val) == (val) ? pmd_val(pmd) & (val) \
	212	: !!(pmd_val(pmd) & (val)))
	213	#define pmd_isclear(pmd, val) (!(pmd_val(pmd) & (val)))
	214
	215	#define pmd_young(pmd) (pmd_isset((pmd), PMD_SECT_AF))
bd951303 SC	216	#define pte_special(pte) (pte_isset((pte), L_PTE_SPECIAL))
	217	static inline pte_t pte_mkspecial(pte_t pte)
	218	{
	219	pte_val(pte) \|= L_PTE_SPECIAL;
	220	return pte;
	221	}
	222	#define __HAVE_ARCH_PTE_SPECIAL
8d962507 CM	223
8d962507 CM	224	#define __HAVE_ARCH_PMD_WRITE
ded94779 SC	225	#define pmd_write(pmd) (pmd_isclear((pmd), L_PMD_SECT_RDONLY))
ded94779 SC	226	#define pmd_dirty(pmd) (pmd_isset((pmd), L_PMD_SECT_DIRTY))
b8cd51af SC	227	#define pud_page(pud) pmd_page(__pmd(pud_val(pud)))
b8cd51af SC	228	#define pud_write(pud) pmd_write(__pmd(pud_val(pud)))
8d962507	229
a3a9ea65 SC	230	#define pmd_hugewillfault(pmd) (!pmd_young(pmd) \|\| !pmd_write(pmd))
	231	#define pmd_thp_or_huge(pmd) (pmd_huge(pmd) \|\| pmd_trans_huge(pmd))
	232
8d962507	233	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
f2950706	234	#define pmd_trans_huge(pmd) (pmd_val(pmd) && !pmd_table(pmd))
ded94779	235	#define pmd_trans_splitting(pmd) (pmd_isset((pmd), L_PMD_SECT_SPLITTING))
b8cd51af SC	236
	237	#ifdef CONFIG_HAVE_RCU_TABLE_FREE
	238	#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
	239	void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
	240	pmd_t *pmdp);
	241	#endif
8d962507 CM	242	#endif
	243
	244	#define PMD_BIT_FUNC(fn,op) \
	245	static inline pmd_t pmd_##fn(pmd_t pmd) { pmd_val(pmd) op; return pmd; }
	246
ded94779	247	PMD_BIT_FUNC(wrprotect, \|= L_PMD_SECT_RDONLY);
8d962507	248	PMD_BIT_FUNC(mkold, &= ~PMD_SECT_AF);
ded94779 SC	249	PMD_BIT_FUNC(mksplitting, \|= L_PMD_SECT_SPLITTING);
	250	PMD_BIT_FUNC(mkwrite, &= ~L_PMD_SECT_RDONLY);
	251	PMD_BIT_FUNC(mkdirty, \|= L_PMD_SECT_DIRTY);
8d962507 CM	252	PMD_BIT_FUNC(mkyoung, \|= PMD_SECT_AF);
	253
	254	#define pmd_mkhuge(pmd) (__pmd(pmd_val(pmd) & ~PMD_TABLE_BIT))
	255
	256	#define pmd_pfn(pmd) (((pmd_val(pmd) & PMD_MASK) & PHYS_MASK) >> PAGE_SHIFT)
	257	#define pfn_pmd(pfn,prot) (__pmd(((phys_addr_t)(pfn) << PAGE_SHIFT) \| pgprot_val(prot)))
	258	#define mk_pmd(page,prot) pfn_pmd(page_to_pfn(page),prot)
	259
	260	/* represent a notpresent pmd by zero, this is used by pmdp_invalidate */
4d942466 MG	261	static inline pmd_t pmd_mknotpresent(pmd_t pmd)
	262	{
	263	return __pmd(0);
	264	}
8d962507 CM	265
	266	static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
	267	{
ded94779 SC	268	const pmdval_t mask = PMD_SECT_USER \| PMD_SECT_XN \| L_PMD_SECT_RDONLY \|
ded94779 SC	269	L_PMD_SECT_VALID \| L_PMD_SECT_NONE;
8d962507 CM	270	pmd_val(pmd) = (pmd_val(pmd) & ~mask) \| (pgprot_val(newprot) & mask);
	271	return pmd;
	272	}
	273
	274	static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
	275	pmd_t *pmdp, pmd_t pmd)
	276	{
	277	BUG_ON(addr >= TASK_SIZE);
	278
	279	/* create a faulting entry if PROT_NONE protected */
ded94779 SC	280	if (pmd_val(pmd) & L_PMD_SECT_NONE)
	281	pmd_val(pmd) &= ~L_PMD_SECT_VALID;
	282
	283	if (pmd_write(pmd) && pmd_dirty(pmd))
	284	pmd_val(pmd) &= ~PMD_SECT_AP2;
	285	else
	286	pmd_val(pmd) \|= PMD_SECT_AP2;
8d962507 CM	287
	288	*pmdp = __pmd(pmd_val(pmd) \| PMD_SECT_nG);
	289	flush_pmd_entry(pmdp);
	290	}
	291
	292	static inline int has_transparent_hugepage(void)
	293	{
	294	return 1;
	295	}
	296
da028779 CM	297	#endif /* __ASSEMBLY__ */
da028779 CM	298
dcfdae04	299	#endif /* _ASM_PGTABLE_3LEVEL_H */