[deliverable/linux.git] / arch / arm64 / include / asm / pgtable.h

/*
 * Copyright (C) 2012 ARM Ltd.
 *
 * 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, see <http://www.gnu.org/licenses/>.
 */
#ifndef __ASM_PGTABLE_H
#define __ASM_PGTABLE_H

#include <asm/proc-fns.h>

#include <asm/memory.h>
#include <asm/pgtable-hwdef.h>

/*
 * Software defined PTE bits definition.
 */
#define PTE_VALID		(_AT(pteval_t, 1) << 0)
#define PTE_PROT_NONE		(_AT(pteval_t, 1) << 2)	/* only when !PTE_VALID */
#define PTE_FILE		(_AT(pteval_t, 1) << 3)	/* only when !pte_present() */
#define PTE_DIRTY		(_AT(pteval_t, 1) << 55)
#define PTE_SPECIAL		(_AT(pteval_t, 1) << 56)

/*
 * VMALLOC and SPARSEMEM_VMEMMAP ranges.
 */
#define VMALLOC_START		UL(0xffffff8000000000)
#define VMALLOC_END		(PAGE_OFFSET - UL(0x400000000) - SZ_64K)

#define vmemmap			((struct page *)(VMALLOC_END + SZ_64K))

#define FIRST_USER_ADDRESS	0

#ifndef __ASSEMBLY__
extern void __pte_error(const char *file, int line, unsigned long val);
extern void __pmd_error(const char *file, int line, unsigned long val);
extern void __pgd_error(const char *file, int line, unsigned long val);

#define pte_ERROR(pte)		__pte_error(__FILE__, __LINE__, pte_val(pte))
#ifndef CONFIG_ARM64_64K_PAGES
#define pmd_ERROR(pmd)		__pmd_error(__FILE__, __LINE__, pmd_val(pmd))
#endif
#define pgd_ERROR(pgd)		__pgd_error(__FILE__, __LINE__, pgd_val(pgd))

/*
 * The pgprot_* and protection_map entries will be fixed up at runtime to
 * include the cachable and bufferable bits based on memory policy, as well as
 * any architecture dependent bits like global/ASID and SMP shared mapping
 * bits.
 */
#define _PAGE_DEFAULT		PTE_TYPE_PAGE | PTE_AF

extern pgprot_t pgprot_default;

#define __pgprot_modify(prot,mask,bits) \
	__pgprot((pgprot_val(prot) & ~(mask)) | (bits))

#define _MOD_PROT(p, b)		__pgprot_modify(p, 0, b)

#define PAGE_NONE		__pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN)
#define PAGE_SHARED		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
#define PAGE_SHARED_EXEC	_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN)
#define PAGE_COPY		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
#define PAGE_COPY_EXEC		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
#define PAGE_READONLY		_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
#define PAGE_READONLY_EXEC	_MOD_PROT(pgprot_default, PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
#define PAGE_KERNEL		_MOD_PROT(pgprot_default, PTE_PXN | PTE_UXN | PTE_DIRTY)
#define PAGE_KERNEL_EXEC	_MOD_PROT(pgprot_default, PTE_UXN | PTE_DIRTY)

#define __PAGE_NONE		__pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) | PTE_PROT_NONE | PTE_RDONLY | PTE_PXN | PTE_UXN)
#define __PAGE_SHARED		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN)
#define __PAGE_SHARED_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN)
#define __PAGE_COPY		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
#define __PAGE_COPY_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)
#define __PAGE_READONLY		__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_UXN | PTE_RDONLY)
#define __PAGE_READONLY_EXEC	__pgprot(_PAGE_DEFAULT | PTE_USER | PTE_NG | PTE_PXN | PTE_RDONLY)

#endif /* __ASSEMBLY__ */

#define __P000  __PAGE_NONE
#define __P001  __PAGE_READONLY
#define __P010  __PAGE_COPY
#define __P011  __PAGE_COPY
#define __P100  __PAGE_READONLY_EXEC
#define __P101  __PAGE_READONLY_EXEC
#define __P110  __PAGE_COPY_EXEC
#define __P111  __PAGE_COPY_EXEC

#define __S000  __PAGE_NONE
#define __S001  __PAGE_READONLY
#define __S010  __PAGE_SHARED
#define __S011  __PAGE_SHARED
#define __S100  __PAGE_READONLY_EXEC
#define __S101  __PAGE_READONLY_EXEC
#define __S110  __PAGE_SHARED_EXEC
#define __S111  __PAGE_SHARED_EXEC

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

#define pte_pfn(pte)		((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)

#define pfn_pte(pfn,prot)	(__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) | pgprot_val(prot)))

#define pte_none(pte)		(!pte_val(pte))
#define pte_clear(mm,addr,ptep)	set_pte(ptep, __pte(0))
#define pte_page(pte)		(pfn_to_page(pte_pfn(pte)))
#define pte_offset_kernel(dir,addr)	(pmd_page_vaddr(*(dir)) + __pte_index(addr))

#define pte_offset_map(dir,addr)	pte_offset_kernel((dir), (addr))
#define pte_offset_map_nested(dir,addr)	pte_offset_kernel((dir), (addr))
#define pte_unmap(pte)			do { } while (0)
#define pte_unmap_nested(pte)		do { } while (0)

/*
 * The following only work if pte_present(). Undefined behaviour otherwise.
 */
#define pte_present(pte)	(pte_val(pte) & (PTE_VALID | PTE_PROT_NONE))
#define pte_dirty(pte)		(pte_val(pte) & PTE_DIRTY)
#define pte_young(pte)		(pte_val(pte) & PTE_AF)
#define pte_special(pte)	(pte_val(pte) & PTE_SPECIAL)
#define pte_write(pte)		(!(pte_val(pte) & PTE_RDONLY))
#define pte_exec(pte)		(!(pte_val(pte) & PTE_UXN))

#define pte_valid_user(pte) \
	((pte_val(pte) & (PTE_VALID | PTE_USER)) == (PTE_VALID | PTE_USER))

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

PTE_BIT_FUNC(wrprotect, |= PTE_RDONLY);
PTE_BIT_FUNC(mkwrite,   &= ~PTE_RDONLY);
PTE_BIT_FUNC(mkclean,   &= ~PTE_DIRTY);
PTE_BIT_FUNC(mkdirty,   |= PTE_DIRTY);
PTE_BIT_FUNC(mkold,     &= ~PTE_AF);
PTE_BIT_FUNC(mkyoung,   |= PTE_AF);
PTE_BIT_FUNC(mkspecial, |= PTE_SPECIAL);

static inline void set_pte(pte_t *ptep, pte_t pte)
{
	*ptep = pte;
}

extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);

static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
			      pte_t *ptep, pte_t pte)
{
	if (pte_valid_user(pte)) {
		if (pte_exec(pte))
			__sync_icache_dcache(pte, addr);
		if (!pte_dirty(pte))
			pte = pte_wrprotect(pte);
	}

	set_pte(ptep, pte);
}

/*
 * Huge pte definitions.
 */
#define pte_huge(pte)		(!(pte_val(pte) & PTE_TABLE_BIT))
#define pte_mkhuge(pte)		(__pte(pte_val(pte) & ~PTE_TABLE_BIT))

/*
 * Hugetlb definitions.
 */
#define HUGE_MAX_HSTATE		2
#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)

#define __HAVE_ARCH_PTE_SPECIAL

/*
 * Mark the prot value as uncacheable and unbufferable.
 */
#define pgprot_noncached(prot) \
	__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE))
#define pgprot_writecombine(prot) \
	__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE))
#define pgprot_dmacoherent(prot) \
	__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC))
#define __HAVE_PHYS_MEM_ACCESS_PROT
struct file;
extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
				     unsigned long size, pgprot_t vma_prot);

#define pmd_none(pmd)		(!pmd_val(pmd))
#define pmd_present(pmd)	(pmd_val(pmd))

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

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

static inline void pmd_clear(pmd_t *pmdp)
{
	set_pmd(pmdp, __pmd(0));
}

static inline pte_t *pmd_page_vaddr(pmd_t pmd)
{
	return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
}

#define pmd_page(pmd)		pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */
#define mk_pte(page,prot)	pfn_pte(page_to_pfn(page),prot)

#ifndef CONFIG_ARM64_64K_PAGES

#define pud_none(pud)		(!pud_val(pud))
#define pud_bad(pud)		(!(pud_val(pud) & 2))
#define pud_present(pud)	(pud_val(pud))

static inline void set_pud(pud_t *pudp, pud_t pud)
{
	*pudp = pud;
	dsb();
}

static inline void pud_clear(pud_t *pudp)
{
	set_pud(pudp, __pud(0));
}

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

#endif	/* CONFIG_ARM64_64K_PAGES */

/* to find an entry in a page-table-directory */
#define pgd_index(addr)		(((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))

#define pgd_offset(mm, addr)	((mm)->pgd+pgd_index(addr))

/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(addr)	pgd_offset(&init_mm, addr)

/* Find an entry in the second-level page table.. */
#ifndef CONFIG_ARM64_64K_PAGES
#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);
}
#endif

/* Find an entry in the third-level page table.. */
#define __pte_index(addr)	(((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))

static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	const pteval_t mask = PTE_USER | PTE_PXN | PTE_UXN | PTE_RDONLY |
			      PTE_PROT_NONE | PTE_VALID;
	pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
	return pte;
}

extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern pgd_t idmap_pg_dir[PTRS_PER_PGD];

#define SWAPPER_DIR_SIZE	(3 * PAGE_SIZE)
#define IDMAP_DIR_SIZE		(2 * PAGE_SIZE)

/*
 * Encode and decode a swap entry:
 *	bits 0, 2:	present (must both be zero)
 *	bit  3:		PTE_FILE
 *	bits 4-8:	swap type
 *	bits 9-63:	swap offset
 */
#define __SWP_TYPE_SHIFT	4
#define __SWP_TYPE_BITS		6
#define __SWP_TYPE_MASK		((1 << __SWP_TYPE_BITS) - 1)
#define __SWP_OFFSET_SHIFT	(__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)

#define __swp_type(x)		(((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
#define __swp_offset(x)		((x).val >> __SWP_OFFSET_SHIFT)
#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) })

#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(swp)	((pte_t) { (swp).val })

/*
 * Ensure that there are not more swap files than can be encoded in the kernel
 * the PTEs.
 */
#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)

/*
 * Encode and decode a file entry:
 *	bits 0, 2:	present (must both be zero)
 *	bit  3:		PTE_FILE
 *	bits 4-63:	file offset / PAGE_SIZE
 */
#define pte_file(pte)		(pte_val(pte) & PTE_FILE)
#define pte_to_pgoff(x)		(pte_val(x) >> 4)
#define pgoff_to_pte(x)		__pte(((x) << 4) | PTE_FILE)

#define PTE_FILE_MAX_BITS	60

extern int kern_addr_valid(unsigned long addr);

#include <asm-generic/pgtable.h>

/*
 * remap a physical page `pfn' of size `size' with page protection `prot'
 * into virtual address `from'
 */
#define io_remap_pfn_range(vma,from,pfn,size,prot) \
		remap_pfn_range(vma, from, pfn, size, prot)

#define pgtable_cache_init() do { } while (0)

#endif /* !__ASSEMBLY__ */

#endif /* __ASM_PGTABLE_H */
Commit	Line	Data
4f04d8f0 CM	1	/*
	2	* Copyright (C) 2012 ARM Ltd.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License
	14	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	15	*/
	16	#ifndef __ASM_PGTABLE_H
	17	#define __ASM_PGTABLE_H
	18
	19	#include <asm/proc-fns.h>
	20
	21	#include <asm/memory.h>
	22	#include <asm/pgtable-hwdef.h>
	23
	24	/*
	25	* Software defined PTE bits definition.
	26	*/
a6fadf7e	27	#define PTE_VALID (_AT(pteval_t, 1) << 0)
59911ca4 SC	28	#define PTE_PROT_NONE (_AT(pteval_t, 1) << 2) /* only when !PTE_VALID */
59911ca4 SC	29	#define PTE_FILE (_AT(pteval_t, 1) << 3) /* only when !pte_present() */
4f04d8f0 CM	30	#define PTE_DIRTY (_AT(pteval_t, 1) << 55)
	31	#define PTE_SPECIAL (_AT(pteval_t, 1) << 56)
	32
	33	/*
	34	* VMALLOC and SPARSEMEM_VMEMMAP ranges.
	35	*/
	36	#define VMALLOC_START UL(0xffffff8000000000)
	37	#define VMALLOC_END (PAGE_OFFSET - UL(0x400000000) - SZ_64K)
	38
	39	#define vmemmap ((struct page *)(VMALLOC_END + SZ_64K))
	40
	41	#define FIRST_USER_ADDRESS 0
	42
	43	#ifndef __ASSEMBLY__
	44	extern void __pte_error(const char *file, int line, unsigned long val);
	45	extern void __pmd_error(const char *file, int line, unsigned long val);
	46	extern void __pgd_error(const char *file, int line, unsigned long val);
	47
	48	#define pte_ERROR(pte) __pte_error(__FILE__, __LINE__, pte_val(pte))
	49	#ifndef CONFIG_ARM64_64K_PAGES
	50	#define pmd_ERROR(pmd) __pmd_error(__FILE__, __LINE__, pmd_val(pmd))
	51	#endif
	52	#define pgd_ERROR(pgd) __pgd_error(__FILE__, __LINE__, pgd_val(pgd))
	53
	54	/*
	55	* The pgprot_* and protection_map entries will be fixed up at runtime to
	56	* include the cachable and bufferable bits based on memory policy, as well as
	57	* any architecture dependent bits like global/ASID and SMP shared mapping
	58	* bits.
	59	*/
	60	#define _PAGE_DEFAULT PTE_TYPE_PAGE \| PTE_AF
	61
	62	extern pgprot_t pgprot_default;
	63
a6fadf7e WD	64	#define __pgprot_modify(prot,mask,bits) \
	65	__pgprot((pgprot_val(prot) & ~(mask)) \| (bits))
	66
	67	#define _MOD_PROT(p, b) __pgprot_modify(p, 0, b)
4f04d8f0	68
072b1b62	69	#define PAGE_NONE __pgprot_modify(pgprot_default, PTE_TYPE_MASK, PTE_PROT_NONE \| PTE_RDONLY \| PTE_PXN \| PTE_UXN)
8e620b04 CM	70	#define PAGE_SHARED _MOD_PROT(pgprot_default, PTE_USER \| PTE_NG \| PTE_PXN \| PTE_UXN)
	71	#define PAGE_SHARED_EXEC _MOD_PROT(pgprot_default, PTE_USER \| PTE_NG \| PTE_PXN)
	72	#define PAGE_COPY _MOD_PROT(pgprot_default, PTE_USER \| PTE_NG \| PTE_PXN \| PTE_UXN \| PTE_RDONLY)
	73	#define PAGE_COPY_EXEC _MOD_PROT(pgprot_default, PTE_USER \| PTE_NG \| PTE_PXN \| PTE_RDONLY)
	74	#define PAGE_READONLY _MOD_PROT(pgprot_default, PTE_USER \| PTE_NG \| PTE_PXN \| PTE_UXN \| PTE_RDONLY)
	75	#define PAGE_READONLY_EXEC _MOD_PROT(pgprot_default, PTE_USER \| PTE_NG \| PTE_PXN \| PTE_RDONLY)
	76	#define PAGE_KERNEL _MOD_PROT(pgprot_default, PTE_PXN \| PTE_UXN \| PTE_DIRTY)
	77	#define PAGE_KERNEL_EXEC _MOD_PROT(pgprot_default, PTE_UXN \| PTE_DIRTY)
	78
072b1b62	79	#define __PAGE_NONE __pgprot(((_PAGE_DEFAULT) & ~PTE_TYPE_MASK) \| PTE_PROT_NONE \| PTE_RDONLY \| PTE_PXN \| PTE_UXN)
8e620b04 CM	80	#define __PAGE_SHARED __pgprot(_PAGE_DEFAULT \| PTE_USER \| PTE_NG \| PTE_PXN \| PTE_UXN)
	81	#define __PAGE_SHARED_EXEC __pgprot(_PAGE_DEFAULT \| PTE_USER \| PTE_NG \| PTE_PXN)
	82	#define __PAGE_COPY __pgprot(_PAGE_DEFAULT \| PTE_USER \| PTE_NG \| PTE_PXN \| PTE_UXN \| PTE_RDONLY)
	83	#define __PAGE_COPY_EXEC __pgprot(_PAGE_DEFAULT \| PTE_USER \| PTE_NG \| PTE_PXN \| PTE_RDONLY)
	84	#define __PAGE_READONLY __pgprot(_PAGE_DEFAULT \| PTE_USER \| PTE_NG \| PTE_PXN \| PTE_UXN \| PTE_RDONLY)
	85	#define __PAGE_READONLY_EXEC __pgprot(_PAGE_DEFAULT \| PTE_USER \| PTE_NG \| PTE_PXN \| PTE_RDONLY)
4f04d8f0 CM	86
	87	#endif /* __ASSEMBLY__ */
	88
	89	#define __P000 __PAGE_NONE
	90	#define __P001 __PAGE_READONLY
	91	#define __P010 __PAGE_COPY
	92	#define __P011 __PAGE_COPY
	93	#define __P100 __PAGE_READONLY_EXEC
	94	#define __P101 __PAGE_READONLY_EXEC
	95	#define __P110 __PAGE_COPY_EXEC
	96	#define __P111 __PAGE_COPY_EXEC
	97
	98	#define __S000 __PAGE_NONE
	99	#define __S001 __PAGE_READONLY
	100	#define __S010 __PAGE_SHARED
	101	#define __S011 __PAGE_SHARED
	102	#define __S100 __PAGE_READONLY_EXEC
	103	#define __S101 __PAGE_READONLY_EXEC
	104	#define __S110 __PAGE_SHARED_EXEC
	105	#define __S111 __PAGE_SHARED_EXEC
	106
	107	#ifndef __ASSEMBLY__
	108	/*
	109	* ZERO_PAGE is a global shared page that is always zero: used
	110	* for zero-mapped memory areas etc..
	111	*/
	112	extern struct page *empty_zero_page;
	113	#define ZERO_PAGE(vaddr) (empty_zero_page)
	114
	115	#define pte_pfn(pte) ((pte_val(pte) & PHYS_MASK) >> PAGE_SHIFT)
	116
	117	#define pfn_pte(pfn,prot) (__pte(((phys_addr_t)(pfn) << PAGE_SHIFT) \| pgprot_val(prot)))
	118
	119	#define pte_none(pte) (!pte_val(pte))
	120	#define pte_clear(mm,addr,ptep) set_pte(ptep, __pte(0))
	121	#define pte_page(pte) (pfn_to_page(pte_pfn(pte)))
	122	#define pte_offset_kernel(dir,addr) (pmd_page_vaddr(*(dir)) + __pte_index(addr))
	123
	124	#define pte_offset_map(dir,addr) pte_offset_kernel((dir), (addr))
	125	#define pte_offset_map_nested(dir,addr) pte_offset_kernel((dir), (addr))
	126	#define pte_unmap(pte) do { } while (0)
	127	#define pte_unmap_nested(pte) do { } while (0)
	128
	129	/*
	130	* The following only work if pte_present(). Undefined behaviour otherwise.
	131	*/
a6fadf7e	132	#define pte_present(pte) (pte_val(pte) & (PTE_VALID \| PTE_PROT_NONE))
4f04d8f0 CM	133	#define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY)
	134	#define pte_young(pte) (pte_val(pte) & PTE_AF)
	135	#define pte_special(pte) (pte_val(pte) & PTE_SPECIAL)
	136	#define pte_write(pte) (!(pte_val(pte) & PTE_RDONLY))
8e620b04	137	#define pte_exec(pte) (!(pte_val(pte) & PTE_UXN))
4f04d8f0	138
a6fadf7e	139	#define pte_valid_user(pte) \
02522463	140	((pte_val(pte) & (PTE_VALID \| PTE_USER)) == (PTE_VALID \| PTE_USER))
4f04d8f0 CM	141
	142	#define PTE_BIT_FUNC(fn,op) \
	143	static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
	144
	145	PTE_BIT_FUNC(wrprotect, \|= PTE_RDONLY);
	146	PTE_BIT_FUNC(mkwrite, &= ~PTE_RDONLY);
	147	PTE_BIT_FUNC(mkclean, &= ~PTE_DIRTY);
	148	PTE_BIT_FUNC(mkdirty, \|= PTE_DIRTY);
	149	PTE_BIT_FUNC(mkold, &= ~PTE_AF);
	150	PTE_BIT_FUNC(mkyoung, \|= PTE_AF);
	151	PTE_BIT_FUNC(mkspecial, \|= PTE_SPECIAL);
	152
	153	static inline void set_pte(pte_t *ptep, pte_t pte)
	154	{
	155	*ptep = pte;
	156	}
	157
	158	extern void __sync_icache_dcache(pte_t pteval, unsigned long addr);
	159
	160	static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
	161	pte_t *ptep, pte_t pte)
	162	{
a6fadf7e	163	if (pte_valid_user(pte)) {
02522463 WD	164	if (pte_exec(pte))
	165	__sync_icache_dcache(pte, addr);
	166	if (!pte_dirty(pte))
	167	pte = pte_wrprotect(pte);
	168	}
	169
4f04d8f0 CM	170	set_pte(ptep, pte);
	171	}
	172
	173	/*
	174	* Huge pte definitions.
	175	*/
084bd298 SC	176	#define pte_huge(pte) (!(pte_val(pte) & PTE_TABLE_BIT))
	177	#define pte_mkhuge(pte) (__pte(pte_val(pte) & ~PTE_TABLE_BIT))
	178
	179	/*
	180	* Hugetlb definitions.
	181	*/
	182	#define HUGE_MAX_HSTATE 2
	183	#define HPAGE_SHIFT PMD_SHIFT
	184	#define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT)
	185	#define HPAGE_MASK (~(HPAGE_SIZE - 1))
	186	#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
4f04d8f0	187
4f04d8f0 CM	188	#define __HAVE_ARCH_PTE_SPECIAL
	189
	190	/*
	191	* Mark the prot value as uncacheable and unbufferable.
	192	*/
	193	#define pgprot_noncached(prot) \
	194	__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_nGnRnE))
	195	#define pgprot_writecombine(prot) \
	196	__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_DEVICE_GRE))
	197	#define pgprot_dmacoherent(prot) \
	198	__pgprot_modify(prot, PTE_ATTRINDX_MASK, PTE_ATTRINDX(MT_NORMAL_NC))
	199	#define __HAVE_PHYS_MEM_ACCESS_PROT
	200	struct file;
	201	extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
	202	unsigned long size, pgprot_t vma_prot);
	203
	204	#define pmd_none(pmd) (!pmd_val(pmd))
	205	#define pmd_present(pmd) (pmd_val(pmd))
	206
	207	#define pmd_bad(pmd) (!(pmd_val(pmd) & 2))
	208
	209	static inline void set_pmd(pmd_t *pmdp, pmd_t pmd)
	210	{
	211	*pmdp = pmd;
	212	dsb();
	213	}
	214
	215	static inline void pmd_clear(pmd_t *pmdp)
	216	{
	217	set_pmd(pmdp, __pmd(0));
	218	}
	219
	220	static inline pte_t *pmd_page_vaddr(pmd_t pmd)
	221	{
	222	return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
	223	}
	224
	225	#define pmd_page(pmd) pfn_to_page(__phys_to_pfn(pmd_val(pmd) & PHYS_MASK))
	226
	227	/*
	228	* Conversion functions: convert a page and protection to a page entry,
	229	* and a page entry and page directory to the page they refer to.
	230	*/
	231	#define mk_pte(page,prot) pfn_pte(page_to_pfn(page),prot)
	232
	233	#ifndef CONFIG_ARM64_64K_PAGES
	234
	235	#define pud_none(pud) (!pud_val(pud))
	236	#define pud_bad(pud) (!(pud_val(pud) & 2))
	237	#define pud_present(pud) (pud_val(pud))
	238
	239	static inline void set_pud(pud_t *pudp, pud_t pud)
	240	{
	241	*pudp = pud;
	242	dsb();
	243	}
	244
	245	static inline void pud_clear(pud_t *pudp)
	246	{
	247	set_pud(pudp, __pud(0));
	248	}
	249
	250	static inline pmd_t *pud_page_vaddr(pud_t pud)
	251	{
252	return __va(pud_val(pud) & PHYS_MASK & (s32)PAGE_MASK);
253	}
254
255	#endif /* CONFIG_ARM64_64K_PAGES */
256
257	/* to find an entry in a page-table-directory */
258	#define pgd_index(addr) (((addr) >> PGDIR_SHIFT) & (PTRS_PER_PGD - 1))
259
260	#define pgd_offset(mm, addr) ((mm)->pgd+pgd_index(addr))
261
262	/* to find an entry in a kernel page-table-directory */
263	#define pgd_offset_k(addr) pgd_offset(&init_mm, addr)
264
265	/* Find an entry in the second-level page table.. */
266	#ifndef CONFIG_ARM64_64K_PAGES
267	#define pmd_index(addr) (((addr) >> PMD_SHIFT) & (PTRS_PER_PMD - 1))
268	static inline pmd_t pmd_offset(pud_t pud, unsigned long addr)
269	{
270	return (pmd_t )pud_page_vaddr(pud) + pmd_index(addr);
271	}
272	#endif
273
274	/* Find an entry in the third-level page table.. */
275	#define __pte_index(addr) (((addr) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
276
277	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
278	{
a6fadf7e WD	279	const pteval_t mask = PTE_USER \| PTE_PXN \| PTE_UXN \| PTE_RDONLY \|
a6fadf7e WD	280	PTE_PROT_NONE \| PTE_VALID;
4f04d8f0 CM	281	pte_val(pte) = (pte_val(pte) & ~mask) \| (pgprot_val(newprot) & mask);
	282	return pte;
	283	}
	284
	285	extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
	286	extern pgd_t idmap_pg_dir[PTRS_PER_PGD];
	287
	288	#define SWAPPER_DIR_SIZE (3 * PAGE_SIZE)
	289	#define IDMAP_DIR_SIZE (2 * PAGE_SIZE)
	290
	291	/*
	292	* Encode and decode a swap entry:
59911ca4 SC	293	* bits 0, 2: present (must both be zero)
	294	* bit 3: PTE_FILE
	295	* bits 4-8: swap type
4f04d8f0 CM	296	* bits 9-63: swap offset
4f04d8f0 CM	297	*/
59911ca4	298	#define __SWP_TYPE_SHIFT 4
4f04d8f0 CM	299	#define __SWP_TYPE_BITS 6
	300	#define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1)
	301	#define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT)
	302
	303	#define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK)
	304	#define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT)
	305	#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) \| ((offset) << __SWP_OFFSET_SHIFT) })
	306
	307	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	308	#define __swp_entry_to_pte(swp) ((pte_t) { (swp).val })
	309
	310	/*
	311	* Ensure that there are not more swap files than can be encoded in the kernel
	312	* the PTEs.
	313	*/
	314	#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > __SWP_TYPE_BITS)
	315
	316	/*
	317	* Encode and decode a file entry:
59911ca4 SC	318	* bits 0, 2: present (must both be zero)
	319	* bit 3: PTE_FILE
	320	* bits 4-63: file offset / PAGE_SIZE
4f04d8f0 CM	321	*/
4f04d8f0 CM	322	#define pte_file(pte) (pte_val(pte) & PTE_FILE)
59911ca4 SC	323	#define pte_to_pgoff(x) (pte_val(x) >> 4)
59911ca4 SC	324	#define pgoff_to_pte(x) __pte(((x) << 4) \| PTE_FILE)
4f04d8f0	325
59911ca4	326	#define PTE_FILE_MAX_BITS 60
4f04d8f0 CM	327
	328	extern int kern_addr_valid(unsigned long addr);
	329
	330	#include <asm-generic/pgtable.h>
	331
	332	/*
	333	* remap a physical page `pfn' of size `size' with page protection `prot'
	334	* into virtual address `from'
	335	*/
	336	#define io_remap_pfn_range(vma,from,pfn,size,prot) \
	337	remap_pfn_range(vma, from, pfn, size, prot)
	338
	339	#define pgtable_cache_init() do { } while (0)
	340
	341	#endif /* !__ASSEMBLY__ */
	342
	343	#endif /* __ASM_PGTABLE_H */