[linux-2.6-block.git] / include / asm-sh / pgtable_64.h

#ifndef __ASM_SH_PGTABLE_64_H
#define __ASM_SH_PGTABLE_64_H

/*
 * include/asm-sh/pgtable_64.h
 *
 * This file contains the functions and defines necessary to modify and use
 * the SuperH page table tree.
 *
 * Copyright (C) 2000, 2001  Paolo Alberelli
 * Copyright (C) 2003, 2004  Paul Mundt
 * Copyright (C) 2003, 2004  Richard Curnow
 *
 * 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.
 */
#include <linux/threads.h>
#include <asm/processor.h>
#include <asm/page.h>

/*
 * Error outputs.
 */
#define pte_ERROR(e) \
	printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
#define pgd_ERROR(e) \
	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))

/*
 * Table setting routines. Used within arch/mm only.
 */
#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)

static __inline__ void set_pte(pte_t *pteptr, pte_t pteval)
{
	unsigned long long x = ((unsigned long long) pteval.pte_low);
	unsigned long long *xp = (unsigned long long *) pteptr;
	/*
	 * Sign-extend based on NPHYS.
	 */
	*(xp) = (x & NPHYS_SIGN) ? (x | NPHYS_MASK) : x;
}
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

static __inline__ void pmd_set(pmd_t *pmdp,pte_t *ptep)
{
	pmd_val(*pmdp) = (unsigned long) ptep;
}

/*
 * PGD defines. Top level.
 */

/* To find an entry in a generic PGD. */
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
#define __pgd_offset(address) pgd_index(address)
#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))

/* To find an entry in a kernel PGD. */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)

/*
 * PMD level access routines. Same notes as above.
 */
#define _PMD_EMPTY		0x0
/* Either the PMD is empty or present, it's not paged out */
#define pmd_present(pmd_entry)	(pmd_val(pmd_entry) & _PAGE_PRESENT)
#define pmd_clear(pmd_entry_p)	(set_pmd((pmd_entry_p), __pmd(_PMD_EMPTY)))
#define pmd_none(pmd_entry)	(pmd_val((pmd_entry)) == _PMD_EMPTY)
#define pmd_bad(pmd_entry)	((pmd_val(pmd_entry) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)

#define pmd_page_vaddr(pmd_entry) \
	((unsigned long) __va(pmd_val(pmd_entry) & PAGE_MASK))

#define pmd_page(pmd) \
	(virt_to_page(pmd_val(pmd)))

/* PMD to PTE dereferencing */
#define pte_index(address) \
		((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))

#define pte_offset_kernel(dir, addr) \
		((pte_t *) ((pmd_val(*(dir))) & PAGE_MASK) + 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)

#ifndef __ASSEMBLY__
#define IOBASE_VADDR	0xff000000
#define IOBASE_END	0xffffffff

/*
 * PTEL coherent flags.
 * See Chapter 17 ST50 CPU Core Volume 1, Architecture.
 */
/* The bits that are required in the SH-5 TLB are placed in the h/w-defined
   positions, to avoid expensive bit shuffling on every refill.  The remaining
   bits are used for s/w purposes and masked out on each refill.

   Note, the PTE slots are used to hold data of type swp_entry_t when a page is
   swapped out.  Only the _PAGE_PRESENT flag is significant when the page is
   swapped out, and it must be placed so that it doesn't overlap either the
   type or offset fields of swp_entry_t.  For x86, offset is at [31:8] and type
   at [6:1], with _PAGE_PRESENT at bit 0 for both pte_t and swp_entry_t.  This
   scheme doesn't map to SH-5 because bit [0] controls cacheability.  So bit
   [2] is used for _PAGE_PRESENT and the type field of swp_entry_t is split
   into 2 pieces.  That is handled by SWP_ENTRY and SWP_TYPE below. */
#define _PAGE_WT	0x001  /* CB0: if cacheable, 1->write-thru, 0->write-back */
#define _PAGE_DEVICE	0x001  /* CB0: if uncacheable, 1->device (i.e. no write-combining or reordering at bus level) */
#define _PAGE_CACHABLE	0x002  /* CB1: uncachable/cachable */
#define _PAGE_PRESENT	0x004  /* software: page referenced */
#define _PAGE_FILE	0x004  /* software: only when !present */
#define _PAGE_SIZE0	0x008  /* SZ0-bit : size of page */
#define _PAGE_SIZE1	0x010  /* SZ1-bit : size of page */
#define _PAGE_SHARED	0x020  /* software: reflects PTEH's SH */
#define _PAGE_READ	0x040  /* PR0-bit : read access allowed */
#define _PAGE_EXECUTE	0x080  /* PR1-bit : execute access allowed */
#define _PAGE_WRITE	0x100  /* PR2-bit : write access allowed */
#define _PAGE_USER	0x200  /* PR3-bit : user space access allowed */
#define _PAGE_DIRTY	0x400  /* software: page accessed in write */
#define _PAGE_ACCESSED	0x800  /* software: page referenced */

/* Mask which drops software flags */
#define _PAGE_FLAGS_HARDWARE_MASK	0xfffffffffffff3dbLL

/*
 * HugeTLB support
 */
#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
#define _PAGE_SZHUGE	(_PAGE_SIZE0)
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
#define _PAGE_SZHUGE	(_PAGE_SIZE1)
#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
#define _PAGE_SZHUGE	(_PAGE_SIZE0 | _PAGE_SIZE1)
#endif

/*
 * Stub out _PAGE_SZHUGE if we don't have a good definition for it,
 * to make pte_mkhuge() happy.
 */
#ifndef _PAGE_SZHUGE
# define _PAGE_SZHUGE	(0)
#endif

/*
 * Default flags for a Kernel page.
 * This is fundametally also SHARED because the main use of this define
 * (other than for PGD/PMD entries) is for the VMALLOC pool which is
 * contextless.
 *
 * _PAGE_EXECUTE is required for modules
 *
 */
#define _KERNPG_TABLE	(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
			 _PAGE_EXECUTE | \
			 _PAGE_CACHABLE | _PAGE_ACCESSED | _PAGE_DIRTY | \
			 _PAGE_SHARED)

/* Default flags for a User page */
#define _PAGE_TABLE	(_KERNPG_TABLE | _PAGE_USER)

#define _PAGE_CHG_MASK	(PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)

/*
 * We have full permissions (Read/Write/Execute/Shared).
 */
#define _PAGE_COMMON	(_PAGE_PRESENT | _PAGE_USER | \
			 _PAGE_CACHABLE | _PAGE_ACCESSED)

#define PAGE_NONE	__pgprot(_PAGE_CACHABLE | _PAGE_ACCESSED)
#define PAGE_SHARED	__pgprot(_PAGE_COMMON | _PAGE_READ | _PAGE_WRITE | \
				 _PAGE_SHARED)
#define PAGE_EXECREAD	__pgprot(_PAGE_COMMON | _PAGE_READ | _PAGE_EXECUTE)

/*
 * We need to include PAGE_EXECUTE in PAGE_COPY because it is the default
 * protection mode for the stack.
 */
#define PAGE_COPY	PAGE_EXECREAD

#define PAGE_READONLY	__pgprot(_PAGE_COMMON | _PAGE_READ)
#define PAGE_WRITEONLY	__pgprot(_PAGE_COMMON | _PAGE_WRITE)
#define PAGE_RWX	__pgprot(_PAGE_COMMON | _PAGE_READ | \
				 _PAGE_WRITE | _PAGE_EXECUTE)
#define PAGE_KERNEL	__pgprot(_KERNPG_TABLE)

#define PAGE_KERNEL_NOCACHE \
			__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
				 _PAGE_EXECUTE | _PAGE_ACCESSED | \
				 _PAGE_DIRTY | _PAGE_SHARED)

/* Make it a device mapping for maximum safety (e.g. for mapping device
   registers into user-space via /dev/map).  */
#define pgprot_noncached(x) __pgprot(((x).pgprot & ~(_PAGE_CACHABLE)) | _PAGE_DEVICE)
#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)

/*
 * Handling allocation failures during page table setup.
 */
extern void __handle_bad_pmd_kernel(pmd_t * pmd);
#define __handle_bad_pmd(x)	__handle_bad_pmd_kernel(x)

/*
 * PTE level access routines.
 *
 * Note1:
 * It's the tree walk leaf. This is physical address to be stored.
 *
 * Note 2:
 * Regarding the choice of _PTE_EMPTY:

   We must choose a bit pattern that cannot be valid, whether or not the page
   is present.  bit[2]==1 => present, bit[2]==0 => swapped out.  If swapped
   out, bits [31:8], [6:3], [1:0] are under swapper control, so only bit[7] is
   left for us to select.  If we force bit[7]==0 when swapped out, we could use
   the combination bit[7,2]=2'b10 to indicate an empty PTE.  Alternatively, if
   we force bit[7]==1 when swapped out, we can use all zeroes to indicate
   empty.  This is convenient, because the page tables get cleared to zero
   when they are allocated.

 */
#define _PTE_EMPTY	0x0
#define pte_present(x)	(pte_val(x) & _PAGE_PRESENT)
#define pte_clear(mm,addr,xp)	(set_pte_at(mm, addr, xp, __pte(_PTE_EMPTY)))
#define pte_none(x)	(pte_val(x) == _PTE_EMPTY)

/*
 * Some definitions to translate between mem_map, PTEs, and page
 * addresses:
 */

/*
 * Given a PTE, return the index of the mem_map[] entry corresponding
 * to the page frame the PTE. Get the absolute physical address, make
 * a relative physical address and translate it to an index.
 */
#define pte_pagenr(x)		(((unsigned long) (pte_val(x)) - \
				 __MEMORY_START) >> PAGE_SHIFT)

/*
 * Given a PTE, return the "struct page *".
 */
#define pte_page(x)		(mem_map + pte_pagenr(x))

/*
 * Return number of (down rounded) MB corresponding to x pages.
 */
#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))


/*
 * The following have defined behavior only work if pte_present() is true.
 */
static inline int pte_dirty(pte_t pte)  { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte)  { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte)   { return pte_val(pte) & _PAGE_FILE; }
static inline int pte_write(pte_t pte)  { return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_special(pte_t pte){ return 0; }

static inline pte_t pte_wrprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_WRITE)); return pte; }
static inline pte_t pte_mkclean(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
static inline pte_t pte_mkold(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
static inline pte_t pte_mkwrite(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_WRITE)); return pte; }
static inline pte_t pte_mkdirty(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
static inline pte_t pte_mkyoung(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
static inline pte_t pte_mkhuge(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_SZHUGE)); return pte; }
static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }


/*
 * Conversion functions: convert a page and protection to a page entry.
 *
 * extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
 */
#define mk_pte(page,pgprot)							\
({										\
	pte_t __pte;								\
										\
	set_pte(&__pte, __pte((((page)-mem_map) << PAGE_SHIFT) | 		\
		__MEMORY_START | pgprot_val((pgprot))));			\
	__pte;									\
})

/*
 * This takes a (absolute) physical page address that is used
 * by the remapping functions
 */
#define mk_pte_phys(physpage, pgprot) \
({ pte_t __pte; set_pte(&__pte, __pte(physpage | pgprot_val(pgprot))); __pte; })

static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{ set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot))); return pte; }

/* Encode and decode a swap entry */
#define __swp_type(x)			(((x).val & 3) + (((x).val >> 1) & 0x3c))
#define __swp_offset(x)			((x).val >> 8)
#define __swp_entry(type, offset)	((swp_entry_t) { ((offset << 8) + ((type & 0x3c) << 1) + (type & 3)) })
#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)		((pte_t) { (x).val })

/* Encode and decode a nonlinear file mapping entry */
#define PTE_FILE_MAX_BITS		29
#define pte_to_pgoff(pte)		(pte_val(pte))
#define pgoff_to_pte(off)		((pte_t) { (off) | _PAGE_FILE })

#endif /* !__ASSEMBLY__ */

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

#endif /* __ASM_SH_PGTABLE_64_H */
Commit	Line	Data
a23ba435 PM	1	#ifndef __ASM_SH_PGTABLE_64_H
a23ba435 PM	2	#define __ASM_SH_PGTABLE_64_H
1da177e4	3
1da177e4	4	/*
a23ba435	5	* include/asm-sh/pgtable_64.h
1da177e4	6	*
a23ba435 PM	7	* This file contains the functions and defines necessary to modify and use
a23ba435 PM	8	* the SuperH page table tree.
1da177e4 LT	9	*
	10	* Copyright (C) 2000, 2001 Paolo Alberelli
	11	* Copyright (C) 2003, 2004 Paul Mundt
	12	* Copyright (C) 2003, 2004 Richard Curnow
	13	*
a23ba435 PM	14	* This file is subject to the terms and conditions of the GNU General Public
	15	* License. See the file "COPYING" in the main directory of this archive
	16	* for more details.
1da177e4	17	*/
249cfea9	18	#include <linux/threads.h>
1da177e4 LT	19	#include <asm/processor.h>
1da177e4 LT	20	#include <asm/page.h>
1da177e4 LT	21
	22	/*
	23	* Error outputs.
	24	*/
	25	#define pte_ERROR(e) \
	26	printk("%s:%d: bad pte %016Lx.\n", __FILE__, __LINE__, pte_val(e))
1da177e4 LT	27	#define pgd_ERROR(e) \
	28	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
	29
	30	/*
	31	* Table setting routines. Used within arch/mm only.
	32	*/
1da177e4 LT	33	#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
	34
	35	static __inline__ void set_pte(pte_t *pteptr, pte_t pteval)
	36	{
249cfea9	37	unsigned long long x = ((unsigned long long) pteval.pte_low);
1da177e4 LT	38	unsigned long long xp = (unsigned long long ) pteptr;
	39	/*
	40	* Sign-extend based on NPHYS.
	41	*/
	42	*(xp) = (x & NPHYS_SIGN) ? (x \| NPHYS_MASK) : x;
	43	}
	44	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
	45
	46	static __inline__ void pmd_set(pmd_t pmdp,pte_t ptep)
	47	{
	48	pmd_val(*pmdp) = (unsigned long) ptep;
	49	}
	50
	51	/*
	52	* PGD defines. Top level.
	53	*/
	54
	55	/* To find an entry in a generic PGD. */
	56	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
	57	#define __pgd_offset(address) pgd_index(address)
	58	#define pgd_offset(mm, address) ((mm)->pgd+pgd_index(address))
	59
	60	/* To find an entry in a kernel PGD. */
	61	#define pgd_offset_k(address) pgd_offset(&init_mm, address)
	62
1da177e4 LT	63	/*
	64	* PMD level access routines. Same notes as above.
	65	*/
	66	#define _PMD_EMPTY 0x0
	67	/* Either the PMD is empty or present, it's not paged out */
	68	#define pmd_present(pmd_entry) (pmd_val(pmd_entry) & _PAGE_PRESENT)
	69	#define pmd_clear(pmd_entry_p) (set_pmd((pmd_entry_p), __pmd(_PMD_EMPTY)))
	70	#define pmd_none(pmd_entry) (pmd_val((pmd_entry)) == _PMD_EMPTY)
	71	#define pmd_bad(pmd_entry) ((pmd_val(pmd_entry) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)
	72
46a82b2d	73	#define pmd_page_vaddr(pmd_entry) \
1da177e4 LT	74	((unsigned long) __va(pmd_val(pmd_entry) & PAGE_MASK))
	75
	76	#define pmd_page(pmd) \
	77	(virt_to_page(pmd_val(pmd)))
	78
	79	/* PMD to PTE dereferencing */
	80	#define pte_index(address) \
	81	((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
	82
	83	#define pte_offset_kernel(dir, addr) \
	84	((pte_t ) ((pmd_val((dir))) & PAGE_MASK) + pte_index((addr)))
	85
	86	#define pte_offset_map(dir,addr) pte_offset_kernel(dir, addr)
	87	#define pte_offset_map_nested(dir,addr) pte_offset_kernel(dir, addr)
	88	#define pte_unmap(pte) do { } while (0)
	89	#define pte_unmap_nested(pte) do { } while (0)
	90
1da177e4	91	#ifndef __ASSEMBLY__
1da177e4 LT	92	#define IOBASE_VADDR 0xff000000
	93	#define IOBASE_END 0xffffffff
	94
	95	/*
	96	* PTEL coherent flags.
	97	* See Chapter 17 ST50 CPU Core Volume 1, Architecture.
	98	*/
	99	/* The bits that are required in the SH-5 TLB are placed in the h/w-defined
	100	positions, to avoid expensive bit shuffling on every refill. The remaining
	101	bits are used for s/w purposes and masked out on each refill.
	102
	103	Note, the PTE slots are used to hold data of type swp_entry_t when a page is
	104	swapped out. Only the _PAGE_PRESENT flag is significant when the page is
	105	swapped out, and it must be placed so that it doesn't overlap either the
	106	type or offset fields of swp_entry_t. For x86, offset is at [31:8] and type
	107	at [6:1], with _PAGE_PRESENT at bit 0 for both pte_t and swp_entry_t. This
	108	scheme doesn't map to SH-5 because bit [0] controls cacheability. So bit
	109	[2] is used for _PAGE_PRESENT and the type field of swp_entry_t is split
	110	into 2 pieces. That is handled by SWP_ENTRY and SWP_TYPE below. */
	111	#define _PAGE_WT 0x001 /* CB0: if cacheable, 1->write-thru, 0->write-back */
	112	#define _PAGE_DEVICE 0x001 /* CB0: if uncacheable, 1->device (i.e. no write-combining or reordering at bus level) */
	113	#define _PAGE_CACHABLE 0x002 /* CB1: uncachable/cachable */
	114	#define _PAGE_PRESENT 0x004 /* software: page referenced */
	115	#define _PAGE_FILE 0x004 /* software: only when !present */
	116	#define _PAGE_SIZE0 0x008 /* SZ0-bit : size of page */
	117	#define _PAGE_SIZE1 0x010 /* SZ1-bit : size of page */
	118	#define _PAGE_SHARED 0x020 /* software: reflects PTEH's SH */
	119	#define _PAGE_READ 0x040 /* PR0-bit : read access allowed */
	120	#define _PAGE_EXECUTE 0x080 /* PR1-bit : execute access allowed */
	121	#define _PAGE_WRITE 0x100 /* PR2-bit : write access allowed */
	122	#define _PAGE_USER 0x200 /* PR3-bit : user space access allowed */
	123	#define _PAGE_DIRTY 0x400 /* software: page accessed in write */
	124	#define _PAGE_ACCESSED 0x800 /* software: page referenced */
	125
	126	/* Mask which drops software flags */
	127	#define _PAGE_FLAGS_HARDWARE_MASK 0xfffffffffffff3dbLL
	128
	129	/*
	130	* HugeTLB support
	131	*/
	132	#if defined(CONFIG_HUGETLB_PAGE_SIZE_64K)
	133	#define _PAGE_SZHUGE (_PAGE_SIZE0)
	134	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_1MB)
	135	#define _PAGE_SZHUGE (_PAGE_SIZE1)
	136	#elif defined(CONFIG_HUGETLB_PAGE_SIZE_512MB)
	137	#define _PAGE_SZHUGE (_PAGE_SIZE0 \| _PAGE_SIZE1)
	138	#endif
	139
52860316 PM	140	/*
	141	* Stub out _PAGE_SZHUGE if we don't have a good definition for it,
	142	* to make pte_mkhuge() happy.
	143	*/
	144	#ifndef _PAGE_SZHUGE
	145	# define _PAGE_SZHUGE (0)
	146	#endif
	147
1da177e4 LT	148	/*
	149	* Default flags for a Kernel page.
	150	* This is fundametally also SHARED because the main use of this define
	151	* (other than for PGD/PMD entries) is for the VMALLOC pool which is
	152	* contextless.
	153	*
	154	* _PAGE_EXECUTE is required for modules
	155	*
	156	*/
	157	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_READ \| _PAGE_WRITE \| \
	158	_PAGE_EXECUTE \| \
	159	_PAGE_CACHABLE \| _PAGE_ACCESSED \| _PAGE_DIRTY \| \
	160	_PAGE_SHARED)
	161
	162	/* Default flags for a User page */
	163	#define _PAGE_TABLE (_KERNPG_TABLE \| _PAGE_USER)
	164
	165	#define _PAGE_CHG_MASK (PTE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	166
249cfea9 PM	167	/*
	168	* We have full permissions (Read/Write/Execute/Shared).
	169	*/
	170	#define _PAGE_COMMON (_PAGE_PRESENT \| _PAGE_USER \| \
	171	_PAGE_CACHABLE \| _PAGE_ACCESSED)
	172
1da177e4	173	#define PAGE_NONE __pgprot(_PAGE_CACHABLE \| _PAGE_ACCESSED)
249cfea9	174	#define PAGE_SHARED __pgprot(_PAGE_COMMON \| _PAGE_READ \| _PAGE_WRITE \| \
1da177e4	175	_PAGE_SHARED)
249cfea9	176	#define PAGE_EXECREAD __pgprot(_PAGE_COMMON \| _PAGE_READ \| _PAGE_EXECUTE)
1da177e4 LT	177
1da177e4 LT	178	/*
249cfea9 PM	179	* We need to include PAGE_EXECUTE in PAGE_COPY because it is the default
249cfea9 PM	180	* protection mode for the stack.
1da177e4	181	*/
249cfea9 PM	182	#define PAGE_COPY PAGE_EXECREAD
	183
	184	#define PAGE_READONLY __pgprot(_PAGE_COMMON \| _PAGE_READ)
	185	#define PAGE_WRITEONLY __pgprot(_PAGE_COMMON \| _PAGE_WRITE)
	186	#define PAGE_RWX __pgprot(_PAGE_COMMON \| _PAGE_READ \| \
	187	_PAGE_WRITE \| _PAGE_EXECUTE)
	188	#define PAGE_KERNEL __pgprot(_KERNPG_TABLE)
1da177e4	189
5e9c8ac5 PM	190	#define PAGE_KERNEL_NOCACHE \
	191	__pgprot(_PAGE_PRESENT \| _PAGE_READ \| _PAGE_WRITE \| \
	192	_PAGE_EXECUTE \| _PAGE_ACCESSED \| \
	193	_PAGE_DIRTY \| _PAGE_SHARED)
	194
1da177e4 LT	195	/* Make it a device mapping for maximum safety (e.g. for mapping device
	196	registers into user-space via /dev/map). */
	197	#define pgprot_noncached(x) __pgprot(((x).pgprot & ~(_PAGE_CACHABLE)) \| _PAGE_DEVICE)
	198	#define pgprot_writecombine(prot) __pgprot(pgprot_val(prot) & ~_PAGE_CACHABLE)
	199
	200	/*
	201	* Handling allocation failures during page table setup.
	202	*/
	203	extern void __handle_bad_pmd_kernel(pmd_t * pmd);
	204	#define __handle_bad_pmd(x) __handle_bad_pmd_kernel(x)
	205
	206	/*
	207	* PTE level access routines.
	208	*
	209	* Note1:
	210	* It's the tree walk leaf. This is physical address to be stored.
	211	*
	212	* Note 2:
	213	* Regarding the choice of _PTE_EMPTY:
	214
	215	We must choose a bit pattern that cannot be valid, whether or not the page
	216	is present. bit[2]==1 => present, bit[2]==0 => swapped out. If swapped
	217	out, bits [31:8], [6:3], [1:0] are under swapper control, so only bit[7] is
	218	left for us to select. If we force bit[7]==0 when swapped out, we could use
	219	the combination bit[7,2]=2'b10 to indicate an empty PTE. Alternatively, if
	220	we force bit[7]==1 when swapped out, we can use all zeroes to indicate
	221	empty. This is convenient, because the page tables get cleared to zero
	222	when they are allocated.
	223
	224	*/
	225	#define _PTE_EMPTY 0x0
	226	#define pte_present(x) (pte_val(x) & _PAGE_PRESENT)
	227	#define pte_clear(mm,addr,xp) (set_pte_at(mm, addr, xp, __pte(_PTE_EMPTY)))
	228	#define pte_none(x) (pte_val(x) == _PTE_EMPTY)
	229
	230	/*
	231	* Some definitions to translate between mem_map, PTEs, and page
	232	* addresses:
	233	*/
	234
	235	/*
	236	* Given a PTE, return the index of the mem_map[] entry corresponding
	237	* to the page frame the PTE. Get the absolute physical address, make
	238	* a relative physical address and translate it to an index.
	239	*/
	240	#define pte_pagenr(x) (((unsigned long) (pte_val(x)) - \
	241	__MEMORY_START) >> PAGE_SHIFT)
	242
	243	/*
	244	* Given a PTE, return the "struct page *".
	245	*/
	246	#define pte_page(x) (mem_map + pte_pagenr(x))
	247
	248	/*
	249	* Return number of (down rounded) MB corresponding to x pages.
	250	*/
	251	#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))
	252
	253
	254	/*
	255	* The following have defined behavior only work if pte_present() is true.
	256	*/
7e675137 NP	257	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
	258	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
	259	static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
	260	static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
	261	static inline int pte_special(pte_t pte){ return 0; }
1da177e4	262
ca5ed2f5	263	static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_WRITE)); return pte; }
ca5ed2f5 AB	264	static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
ca5ed2f5 AB	265	static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
ca5ed2f5	266	static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_WRITE)); return pte; }
ca5ed2f5 AB	267	static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_DIRTY)); return pte; }
	268	static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_ACCESSED)); return pte; }
	269	static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_SZHUGE)); return pte; }
7e675137	270	static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
63551ae0	271
1da177e4 LT	272
	273	/*
	274	* Conversion functions: convert a page and protection to a page entry.
	275	*
	276	* extern pte_t mk_pte(struct page *page, pgprot_t pgprot)
	277	*/
	278	#define mk_pte(page,pgprot) \
	279	({ \
	280	pte_t __pte; \
	281	\
	282	set_pte(&__pte, __pte((((page)-mem_map) << PAGE_SHIFT) \| \
	283	__MEMORY_START \| pgprot_val((pgprot)))); \
	284	__pte; \
	285	})
	286
	287	/*
	288	* This takes a (absolute) physical page address that is used
	289	* by the remapping functions
	290	*/
	291	#define mk_pte_phys(physpage, pgprot) \
	292	({ pte_t __pte; set_pte(&__pte, __pte(physpage \| pgprot_val(pgprot))); __pte; })
	293
ca5ed2f5	294	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
1da177e4 LT	295	{ set_pte(&pte, __pte((pte_val(pte) & _PAGE_CHG_MASK) \| pgprot_val(newprot))); return pte; }
1da177e4 LT	296
1da177e4 LT	297	/* Encode and decode a swap entry */
	298	#define __swp_type(x) (((x).val & 3) + (((x).val >> 1) & 0x3c))
	299	#define __swp_offset(x) ((x).val >> 8)
	300	#define __swp_entry(type, offset) ((swp_entry_t) { ((offset << 8) + ((type & 0x3c) << 1) + (type & 3)) })
	301	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	302	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	303
	304	/* Encode and decode a nonlinear file mapping entry */
	305	#define PTE_FILE_MAX_BITS 29
	306	#define pte_to_pgoff(pte) (pte_val(pte))
	307	#define pgoff_to_pte(off) ((pte_t) { (off) \| _PAGE_FILE })
	308
1da177e4 LT	309	#endif /* !__ASSEMBLY__ */
1da177e4 LT	310
1da177e4 LT	311	#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) \| pgprot_val(prot))
	312	#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) \| pgprot_val(prot))
	313
a23ba435	314	#endif /* __ASM_SH_PGTABLE_64_H */