[net-next-2.6.git] / include / asm-m68k / motorola_pgtable.h

#ifndef _MOTOROLA_PGTABLE_H
#define _MOTOROLA_PGTABLE_H


/*
 * Definitions for MMU descriptors
 */
#define _PAGE_PRESENT	0x001
#define _PAGE_SHORT	0x002
#define _PAGE_RONLY	0x004
#define _PAGE_ACCESSED	0x008
#define _PAGE_DIRTY	0x010
#define _PAGE_SUPER	0x080	/* 68040 supervisor only */
#define _PAGE_GLOBAL040	0x400	/* 68040 global bit, used for kva descs */
#define _PAGE_NOCACHE030 0x040	/* 68030 no-cache mode */
#define _PAGE_NOCACHE	0x060	/* 68040 cache mode, non-serialized */
#define _PAGE_NOCACHE_S	0x040	/* 68040 no-cache mode, serialized */
#define _PAGE_CACHE040	0x020	/* 68040 cache mode, cachable, copyback */
#define _PAGE_CACHE040W	0x000	/* 68040 cache mode, cachable, write-through */

#define _DESCTYPE_MASK	0x003

#define _CACHEMASK040	(~0x060)
#define _TABLE_MASK	(0xfffffe00)

#define _PAGE_TABLE	(_PAGE_SHORT)
#define _PAGE_CHG_MASK  (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_NOCACHE)

#define _PAGE_PROTNONE	0x004
#define _PAGE_FILE	0x008	/* pagecache or swap? */

#ifndef __ASSEMBLY__

/* This is the cache mode to be used for pages containing page descriptors for
 * processors >= '040. It is in pte_mknocache(), and the variable is defined
 * and initialized in head.S */
extern int m68k_pgtable_cachemode;

/* This is the cache mode for normal pages, for supervisor access on
 * processors >= '040. It is used in pte_mkcache(), and the variable is
 * defined and initialized in head.S */

#if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
#define m68k_supervisor_cachemode _PAGE_CACHE040W
#elif defined(CPU_M68040_OR_M68060_ONLY)
#define m68k_supervisor_cachemode _PAGE_CACHE040
#elif defined(CPU_M68020_OR_M68030_ONLY)
#define m68k_supervisor_cachemode 0
#else
extern int m68k_supervisor_cachemode;
#endif

#if defined(CPU_M68040_OR_M68060_ONLY)
#define mm_cachebits _PAGE_CACHE040
#elif defined(CPU_M68020_OR_M68030_ONLY)
#define mm_cachebits 0
#else
extern unsigned long mm_cachebits;
#endif

#define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED | mm_cachebits)
#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED | mm_cachebits)
#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED | mm_cachebits)
#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | mm_cachebits)

/* Alternate definitions that are compile time constants, for
   initializing protection_map.  The cachebits are fixed later.  */
#define PAGE_NONE_C	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
#define PAGE_SHARED_C	__pgprot(_PAGE_PRESENT | _PAGE_ACCESSED)
#define PAGE_COPY_C	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)
#define PAGE_READONLY_C	__pgprot(_PAGE_PRESENT | _PAGE_RONLY | _PAGE_ACCESSED)

/*
 * The m68k can't do page protection for execute, and considers that the same are read.
 * Also, write permissions imply read permissions. This is the closest we can get..
 */
#define __P000	PAGE_NONE_C
#define __P001	PAGE_READONLY_C
#define __P010	PAGE_COPY_C
#define __P011	PAGE_COPY_C
#define __P100	PAGE_READONLY_C
#define __P101	PAGE_READONLY_C
#define __P110	PAGE_COPY_C
#define __P111	PAGE_COPY_C

#define __S000	PAGE_NONE_C
#define __S001	PAGE_READONLY_C
#define __S010	PAGE_SHARED_C
#define __S011	PAGE_SHARED_C
#define __S100	PAGE_READONLY_C
#define __S101	PAGE_READONLY_C
#define __S110	PAGE_SHARED_C
#define __S111	PAGE_SHARED_C

/*
 * 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, pgprot) pfn_pte(page_to_pfn(page), (pgprot))

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

static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
{
	unsigned long ptbl = virt_to_phys(ptep) | _PAGE_TABLE | _PAGE_ACCESSED;
	unsigned long *ptr = pmdp->pmd;
	short i = 16;
	while (--i >= 0) {
		*ptr++ = ptbl;
		ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
	}
}

static inline void pgd_set(pgd_t *pgdp, pmd_t *pmdp)
{
	pgd_val(*pgdp) = _PAGE_TABLE | _PAGE_ACCESSED | __pa(pmdp);
}

#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
#define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
#define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))


#define pte_none(pte)		(!pte_val(pte))
#define pte_present(pte)	(pte_val(pte) & (_PAGE_PRESENT | _PAGE_PROTNONE))
#define pte_clear(mm,addr,ptep)		({ pte_val(*(ptep)) = 0; })

#define pte_page(pte)		virt_to_page(__va(pte_val(pte)))
#define pte_pfn(pte)		(pte_val(pte) >> PAGE_SHIFT)
#define pfn_pte(pfn, prot)	__pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))

#define pmd_none(pmd)		(!pmd_val(pmd))
#define pmd_bad(pmd)		((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
#define pmd_present(pmd)	(pmd_val(pmd) & _PAGE_TABLE)
#define pmd_clear(pmdp) ({			\
	unsigned long *__ptr = pmdp->pmd;	\
	short __i = 16;				\
	while (--__i >= 0)			\
		*__ptr++ = 0;			\
})
#define pmd_page(pmd)		virt_to_page(__va(pmd_val(pmd)))


#define pgd_none(pgd)		(!pgd_val(pgd))
#define pgd_bad(pgd)		((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
#define pgd_present(pgd)	(pgd_val(pgd) & _PAGE_TABLE)
#define pgd_clear(pgdp)		({ pgd_val(*pgdp) = 0; })
#define pgd_page(pgd)		(mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))

#define pte_ERROR(e) \
	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
#define pmd_ERROR(e) \
	printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
#define pgd_ERROR(e) \
	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))


/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
static inline int pte_write(pte_t pte)		{ return !(pte_val(pte) & _PAGE_RONLY); }
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 pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) |= _PAGE_RONLY; return pte; }
static inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
static inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) &= ~_PAGE_RONLY; return pte; }
static inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
static inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
static inline pte_t pte_mknocache(pte_t pte)
{
	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_pgtable_cachemode;
	return pte;
}
static inline pte_t pte_mkcache(pte_t pte)
{
	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
	return pte;
}

#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))

#define pgd_index(address)     ((address) >> PGDIR_SHIFT)

/* to find an entry in a page-table-directory */
static inline pgd_t *pgd_offset(struct mm_struct *mm, unsigned long address)
{
	return mm->pgd + pgd_index(address);
}

#define swapper_pg_dir kernel_pg_dir
extern pgd_t kernel_pg_dir[128];

static inline pgd_t *pgd_offset_k(unsigned long address)
{
	return kernel_pg_dir + (address >> PGDIR_SHIFT);
}


/* Find an entry in the second-level page table.. */
static inline pmd_t *pmd_offset(pgd_t *dir, unsigned long address)
{
	return (pmd_t *)__pgd_page(*dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
}

/* Find an entry in the third-level page table.. */
static inline pte_t *pte_offset_kernel(pmd_t *pmdp, unsigned long address)
{
	return (pte_t *)__pmd_page(*pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
}

#define pte_offset_map(pmdp,address) ((pte_t *)__pmd_page(*pmdp) + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
#define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address)
#define pte_unmap(pte)		((void)0)
#define pte_unmap_nested(pte)	((void)0)

/*
 * Allocate and free page tables. The xxx_kernel() versions are
 * used to allocate a kernel page table - this turns on ASN bits
 * if any.
 */

/* Prior to calling these routines, the page should have been flushed
 * from both the cache and ATC, or the CPU might not notice that the
 * cache setting for the page has been changed. -jskov
 */
static inline void nocache_page(void *vaddr)
{
	unsigned long addr = (unsigned long)vaddr;

	if (CPU_IS_040_OR_060) {
		pgd_t *dir;
		pmd_t *pmdp;
		pte_t *ptep;

		dir = pgd_offset_k(addr);
		pmdp = pmd_offset(dir, addr);
		ptep = pte_offset_kernel(pmdp, addr);
		*ptep = pte_mknocache(*ptep);
	}
}

static inline void cache_page(void *vaddr)
{
	unsigned long addr = (unsigned long)vaddr;

	if (CPU_IS_040_OR_060) {
		pgd_t *dir;
		pmd_t *pmdp;
		pte_t *ptep;

		dir = pgd_offset_k(addr);
		pmdp = pmd_offset(dir, addr);
		ptep = pte_offset_kernel(pmdp, addr);
		*ptep = pte_mkcache(*ptep);
	}
}

#define PTE_FILE_MAX_BITS	28

static inline unsigned long pte_to_pgoff(pte_t pte)
{
	return pte.pte >> 4;
}

static inline pte_t pgoff_to_pte(unsigned off)
{
	pte_t pte = { (off << 4) + _PAGE_FILE };
	return pte;
}

/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
#define __swp_type(x)		(((x).val >> 4) & 0xff)
#define __swp_offset(x)		((x).val >> 12)
#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) })
#define __pte_to_swp_entry(pte)	((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)	((pte_t) { (x).val })

#endif	/* !__ASSEMBLY__ */
#endif /* _MOTOROLA_PGTABLE_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _MOTOROLA_PGTABLE_H
	2	#define _MOTOROLA_PGTABLE_H
	3
1da177e4 LT	4
	5	/*
	6	* Definitions for MMU descriptors
	7	*/
	8	#define _PAGE_PRESENT 0x001
	9	#define _PAGE_SHORT 0x002
	10	#define _PAGE_RONLY 0x004
	11	#define _PAGE_ACCESSED 0x008
	12	#define _PAGE_DIRTY 0x010
	13	#define _PAGE_SUPER 0x080 /* 68040 supervisor only */
	14	#define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */
	15	#define _PAGE_NOCACHE030 0x040 /* 68030 no-cache mode */
	16	#define _PAGE_NOCACHE 0x060 /* 68040 cache mode, non-serialized */
	17	#define _PAGE_NOCACHE_S 0x040 /* 68040 no-cache mode, serialized */
	18	#define _PAGE_CACHE040 0x020 /* 68040 cache mode, cachable, copyback */
	19	#define _PAGE_CACHE040W 0x000 /* 68040 cache mode, cachable, write-through */
	20
	21	#define _DESCTYPE_MASK 0x003
	22
	23	#define _CACHEMASK040 (~0x060)
	24	#define _TABLE_MASK (0xfffffe00)
	25
	26	#define _PAGE_TABLE (_PAGE_SHORT)
	27	#define _PAGE_CHG_MASK (PAGE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY \| _PAGE_NOCACHE)
	28
	29	#define _PAGE_PROTNONE 0x004
	30	#define _PAGE_FILE 0x008 /* pagecache or swap? */
	31
	32	#ifndef __ASSEMBLY__
	33
	34	/* This is the cache mode to be used for pages containing page descriptors for
	35	* processors >= '040. It is in pte_mknocache(), and the variable is defined
	36	* and initialized in head.S */
	37	extern int m68k_pgtable_cachemode;
	38
	39	/* This is the cache mode for normal pages, for supervisor access on
	40	* processors >= '040. It is used in pte_mkcache(), and the variable is
	41	* defined and initialized in head.S */
	42
	43	#if defined(CPU_M68060_ONLY) && defined(CONFIG_060_WRITETHROUGH)
	44	#define m68k_supervisor_cachemode _PAGE_CACHE040W
	45	#elif defined(CPU_M68040_OR_M68060_ONLY)
	46	#define m68k_supervisor_cachemode _PAGE_CACHE040
	47	#elif defined(CPU_M68020_OR_M68030_ONLY)
	48	#define m68k_supervisor_cachemode 0
	49	#else
	50	extern int m68k_supervisor_cachemode;
	51	#endif
	52
	53	#if defined(CPU_M68040_OR_M68060_ONLY)
	54	#define mm_cachebits _PAGE_CACHE040
	55	#elif defined(CPU_M68020_OR_M68030_ONLY)
	56	#define mm_cachebits 0
	57	#else
	58	extern unsigned long mm_cachebits;
	59	#endif
	60
	61	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED \| mm_cachebits)
	62	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_ACCESSED \| mm_cachebits)
	63	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| _PAGE_RONLY \| _PAGE_ACCESSED \| mm_cachebits)
	64	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_RONLY \| _PAGE_ACCESSED \| mm_cachebits)
	65	#define PAGE_KERNEL __pgprot(_PAGE_PRESENT \| _PAGE_DIRTY \| _PAGE_ACCESSED \| mm_cachebits)
	66
	67	/* Alternate definitions that are compile time constants, for
68	initializing protection_map. The cachebits are fixed later. */
69	#define PAGE_NONE_C __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
70	#define PAGE_SHARED_C __pgprot(_PAGE_PRESENT \| _PAGE_ACCESSED)
71	#define PAGE_COPY_C __pgprot(_PAGE_PRESENT \| _PAGE_RONLY \| _PAGE_ACCESSED)
72	#define PAGE_READONLY_C __pgprot(_PAGE_PRESENT \| _PAGE_RONLY \| _PAGE_ACCESSED)
73
74	/*
75	* The m68k can't do page protection for execute, and considers that the same are read.
76	* Also, write permissions imply read permissions. This is the closest we can get..
77	*/
78	#define __P000 PAGE_NONE_C
79	#define __P001 PAGE_READONLY_C
80	#define __P010 PAGE_COPY_C
81	#define __P011 PAGE_COPY_C
82	#define __P100 PAGE_READONLY_C
83	#define __P101 PAGE_READONLY_C
84	#define __P110 PAGE_COPY_C
85	#define __P111 PAGE_COPY_C
86
87	#define __S000 PAGE_NONE_C
88	#define __S001 PAGE_READONLY_C
89	#define __S010 PAGE_SHARED_C
90	#define __S011 PAGE_SHARED_C
91	#define __S100 PAGE_READONLY_C
92	#define __S101 PAGE_READONLY_C
93	#define __S110 PAGE_SHARED_C
94	#define __S111 PAGE_SHARED_C
95
96	/*
97	* Conversion functions: convert a page and protection to a page entry,
98	* and a page entry and page directory to the page they refer to.
99	*/
100	#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
101
102	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
103	{
104	pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) \| pgprot_val(newprot);
105	return pte;
106	}
107
108	static inline void pmd_set(pmd_t pmdp, pte_t ptep)
109	{
110	unsigned long ptbl = virt_to_phys(ptep) \| _PAGE_TABLE \| _PAGE_ACCESSED;
111	unsigned long *ptr = pmdp->pmd;
112	short i = 16;
113	while (--i >= 0) {
114	*ptr++ = ptbl;
115	ptbl += (sizeof(pte_t)*PTRS_PER_PTE/16);
116	}
117	}
118
119	static inline void pgd_set(pgd_t pgdp, pmd_t pmdp)
120	{
121	pgd_val(*pgdp) = _PAGE_TABLE \| _PAGE_ACCESSED \| __pa(pmdp);
122	}
123
124	#define __pte_page(pte) ((unsigned long)__va(pte_val(pte) & PAGE_MASK))
125	#define __pmd_page(pmd) ((unsigned long)__va(pmd_val(pmd) & _TABLE_MASK))
126	#define __pgd_page(pgd) ((unsigned long)__va(pgd_val(pgd) & _TABLE_MASK))
127
128
129	#define pte_none(pte) (!pte_val(pte))
130	#define pte_present(pte) (pte_val(pte) & (_PAGE_PRESENT \| _PAGE_PROTNONE))
131	#define pte_clear(mm,addr,ptep) ({ pte_val(*(ptep)) = 0; })
132
12d810c1	133	#define pte_page(pte) virt_to_page(__va(pte_val(pte)))
1da177e4 LT	134	#define pte_pfn(pte) (pte_val(pte) >> PAGE_SHIFT)
	135	#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) \| pgprot_val(prot))
	136
	137	#define pmd_none(pmd) (!pmd_val(pmd))
	138	#define pmd_bad(pmd) ((pmd_val(pmd) & _DESCTYPE_MASK) != _PAGE_TABLE)
	139	#define pmd_present(pmd) (pmd_val(pmd) & _PAGE_TABLE)
	140	#define pmd_clear(pmdp) ({ \
	141	unsigned long *__ptr = pmdp->pmd; \
	142	short __i = 16; \
	143	while (--__i >= 0) \
	144	*__ptr++ = 0; \
	145	})
12d810c1	146	#define pmd_page(pmd) virt_to_page(__va(pmd_val(pmd)))
1da177e4 LT	147
	148
	149	#define pgd_none(pgd) (!pgd_val(pgd))
	150	#define pgd_bad(pgd) ((pgd_val(pgd) & _DESCTYPE_MASK) != _PAGE_TABLE)
	151	#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_TABLE)
	152	#define pgd_clear(pgdp) ({ pgd_val(*pgdp) = 0; })
46a82b2d	153	#define pgd_page(pgd) (mem_map + ((unsigned long)(__va(pgd_val(pgd)) - PAGE_OFFSET) >> PAGE_SHIFT))
1da177e4 LT	154
	155	#define pte_ERROR(e) \
	156	printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
	157	#define pmd_ERROR(e) \
	158	printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
	159	#define pgd_ERROR(e) \
	160	printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
	161
	162
	163	/*
	164	* The following only work if pte_present() is true.
	165	* Undefined behaviour if not..
	166	*/
1da177e4	167	static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); }
1da177e4 LT	168	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
	169	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
	170	static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
	171
	172	static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) \|= _PAGE_RONLY; return pte; }
1da177e4 LT	173	static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
	174	static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
	175	static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_RONLY; return pte; }
1da177e4 LT	176	static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) \|= _PAGE_DIRTY; return pte; }
	177	static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) \|= _PAGE_ACCESSED; return pte; }
	178	static inline pte_t pte_mknocache(pte_t pte)
	179	{
	180	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) \| m68k_pgtable_cachemode;
	181	return pte;
	182	}
	183	static inline pte_t pte_mkcache(pte_t pte)
	184	{
	185	pte_val(pte) = (pte_val(pte) & _CACHEMASK040) \| m68k_supervisor_cachemode;
	186	return pte;
	187	}
	188
	189	#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))
	190
	191	#define pgd_index(address) ((address) >> PGDIR_SHIFT)
	192
	193	/* to find an entry in a page-table-directory */
	194	static inline pgd_t pgd_offset(struct mm_struct mm, unsigned long address)
	195	{
	196	return mm->pgd + pgd_index(address);
	197	}
	198
	199	#define swapper_pg_dir kernel_pg_dir
	200	extern pgd_t kernel_pg_dir[128];
	201
	202	static inline pgd_t *pgd_offset_k(unsigned long address)
	203	{
	204	return kernel_pg_dir + (address >> PGDIR_SHIFT);
	205	}
	206
	207
	208	/* Find an entry in the second-level page table.. */
	209	static inline pmd_t pmd_offset(pgd_t dir, unsigned long address)
	210	{
	211	return (pmd_t )__pgd_page(dir) + ((address >> PMD_SHIFT) & (PTRS_PER_PMD-1));
	212	}
	213
	214	/* Find an entry in the third-level page table.. */
	215	static inline pte_t pte_offset_kernel(pmd_t pmdp, unsigned long address)
	216	{
	217	return (pte_t )__pmd_page(pmdp) + ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
	218	}
	219
12d810c1	220	#define pte_offset_map(pmdp,address) ((pte_t )__pmd_page(pmdp) + (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)))
1da177e4	221	#define pte_offset_map_nested(pmdp, address) pte_offset_map(pmdp, address)
12d810c1 RZ	222	#define pte_unmap(pte) ((void)0)
12d810c1 RZ	223	#define pte_unmap_nested(pte) ((void)0)
1da177e4 LT	224
	225	/*
	226	* Allocate and free page tables. The xxx_kernel() versions are
	227	* used to allocate a kernel page table - this turns on ASN bits
	228	* if any.
	229	*/
	230
	231	/* Prior to calling these routines, the page should have been flushed
	232	* from both the cache and ATC, or the CPU might not notice that the
	233	* cache setting for the page has been changed. -jskov
	234	*/
	235	static inline void nocache_page(void *vaddr)
	236	{
	237	unsigned long addr = (unsigned long)vaddr;
	238
	239	if (CPU_IS_040_OR_060) {
	240	pgd_t *dir;
	241	pmd_t *pmdp;
	242	pte_t *ptep;
	243
	244	dir = pgd_offset_k(addr);
	245	pmdp = pmd_offset(dir, addr);
	246	ptep = pte_offset_kernel(pmdp, addr);
	247	ptep = pte_mknocache(ptep);
	248	}
	249	}
	250
	251	static inline void cache_page(void *vaddr)
	252	{
	253	unsigned long addr = (unsigned long)vaddr;
	254
	255	if (CPU_IS_040_OR_060) {
	256	pgd_t *dir;
	257	pmd_t *pmdp;
	258	pte_t *ptep;
	259
	260	dir = pgd_offset_k(addr);
	261	pmdp = pmd_offset(dir, addr);
	262	ptep = pte_offset_kernel(pmdp, addr);
	263	ptep = pte_mkcache(ptep);
	264	}
	265	}
	266
	267	#define PTE_FILE_MAX_BITS 28
	268
	269	static inline unsigned long pte_to_pgoff(pte_t pte)
	270	{
	271	return pte.pte >> 4;
	272	}
	273
	274	static inline pte_t pgoff_to_pte(unsigned off)
	275	{
	276	pte_t pte = { (off << 4) + _PAGE_FILE };
	277	return pte;
	278	}
	279
	280	/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */
	281	#define __swp_type(x) (((x).val >> 4) & 0xff)
	282	#define __swp_offset(x) ((x).val >> 12)
	283	#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) \| ((offset) << 12) })
	284	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	285	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	286
	287	#endif /* !__ASSEMBLY__ */
288	#endif /* _MOTOROLA_PGTABLE_H */