[deliverable/linux.git] / include / asm-ia64 / page.h

#ifndef _ASM_IA64_PAGE_H
#define _ASM_IA64_PAGE_H
/*
 * Pagetable related stuff.
 *
 * Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
 *	David Mosberger-Tang <davidm@hpl.hp.com>
 */

#include <asm/intrinsics.h>
#include <asm/types.h>

/*
 * The top three bits of an IA64 address are its Region Number.
 * Different regions are assigned to different purposes.
 */
#define RGN_SHIFT	(61)
#define RGN_BASE(r)	(__IA64_UL_CONST(r)<<RGN_SHIFT)
#define RGN_BITS	(RGN_BASE(-1))

#define RGN_KERNEL	7	/* Identity mapped region */
#define RGN_UNCACHED    6	/* Identity mapped I/O region */
#define RGN_GATE	5	/* Gate page, Kernel text, etc */
#define RGN_HPAGE	4	/* For Huge TLB pages */

/*
 * PAGE_SHIFT determines the actual kernel page size.
 */
#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
# define PAGE_SHIFT	12
#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
# define PAGE_SHIFT	13
#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
# define PAGE_SHIFT	14
#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
# define PAGE_SHIFT	16
#else
# error Unsupported page size!
#endif

#define PAGE_SIZE		(__IA64_UL_CONST(1) << PAGE_SHIFT)
#define PAGE_MASK		(~(PAGE_SIZE - 1))
#define PAGE_ALIGN(addr)	(((addr) + PAGE_SIZE - 1) & PAGE_MASK)

#define PERCPU_PAGE_SHIFT	16	/* log2() of max. size of per-CPU area */
#define PERCPU_PAGE_SIZE	(__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)


#ifdef CONFIG_HUGETLB_PAGE
# define HPAGE_REGION_BASE	RGN_BASE(RGN_HPAGE)
# define HPAGE_SHIFT		hpage_shift
# define HPAGE_SHIFT_DEFAULT	28	/* check ia64 SDM for architecture supported size */
# define HPAGE_SIZE		(__IA64_UL_CONST(1) << HPAGE_SHIFT)
# define HPAGE_MASK		(~(HPAGE_SIZE - 1))

# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
# define ARCH_HAS_HUGEPAGE_ONLY_RANGE
# define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
# define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
#endif /* CONFIG_HUGETLB_PAGE */

#ifdef __ASSEMBLY__
# define __pa(x)		((x) - PAGE_OFFSET)
# define __va(x)		((x) + PAGE_OFFSET)
#else /* !__ASSEMBLY */
#  define STRICT_MM_TYPECHECKS

extern void clear_page (void *page);
extern void copy_page (void *to, void *from);

/*
 * clear_user_page() and copy_user_page() can't be inline functions because
 * flush_dcache_page() can't be defined until later...
 */
#define clear_user_page(addr, vaddr, page)	\
do {						\
	clear_page(addr);			\
	flush_dcache_page(page);		\
} while (0)

#define copy_user_page(to, from, vaddr, page)	\
do {						\
	copy_page((to), (from));		\
	flush_dcache_page(page);		\
} while (0)


#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr)		\
({									\
	struct page *page = alloc_page_vma(				\
		GFP_HIGHUSER | __GFP_ZERO | movableflags, vma, vaddr);	\
	if (page)							\
 		flush_dcache_page(page);				\
	page;								\
})

#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE

#define virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)

#ifdef CONFIG_VIRTUAL_MEM_MAP
extern int ia64_pfn_valid (unsigned long pfn);
#else
# define ia64_pfn_valid(pfn) 1
#endif

#ifdef CONFIG_VIRTUAL_MEM_MAP
extern struct page *vmem_map;
#ifdef CONFIG_DISCONTIGMEM
# define page_to_pfn(page)	((unsigned long) (page - vmem_map))
# define pfn_to_page(pfn)	(vmem_map + (pfn))
#else
# include <asm-generic/memory_model.h>
#endif
#else
# include <asm-generic/memory_model.h>
#endif

#ifdef CONFIG_FLATMEM
# define pfn_valid(pfn)		(((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
#elif defined(CONFIG_DISCONTIGMEM)
extern unsigned long min_low_pfn;
extern unsigned long max_low_pfn;
# define pfn_valid(pfn)		(((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
#endif

#define page_to_phys(page)	(page_to_pfn(page) << PAGE_SHIFT)
#define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
#define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)

typedef union ia64_va {
	struct {
		unsigned long off : 61;		/* intra-region offset */
		unsigned long reg :  3;		/* region number */
	} f;
	unsigned long l;
	void *p;
} ia64_va;

/*
 * Note: These macros depend on the fact that PAGE_OFFSET has all
 * region bits set to 1 and all other bits set to zero.  They are
 * expressed in this way to ensure they result in a single "dep"
 * instruction.
 */
#define __pa(x)		({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
#define __va(x)		({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})

#define REGION_NUMBER(x)	({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
#define REGION_OFFSET(x)	({ia64_va _v; _v.l = (long) (x); _v.f.off;})

#ifdef CONFIG_HUGETLB_PAGE
# define htlbpage_to_page(x)	(((unsigned long) REGION_NUMBER(x) << 61)			\
				 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
# define HUGETLB_PAGE_ORDER	(HPAGE_SHIFT - PAGE_SHIFT)
# define is_hugepage_only_range(mm, addr, len)		\
	 (REGION_NUMBER(addr) == RGN_HPAGE ||	\
	  REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
extern unsigned int hpage_shift;
#endif

static __inline__ int
get_order (unsigned long size)
{
	long double d = size - 1;
	long order;

	order = ia64_getf_exp(d);
	order = order - PAGE_SHIFT - 0xffff + 1;
	if (order < 0)
		order = 0;
	return order;
}

#endif /* !__ASSEMBLY__ */

#ifdef STRICT_MM_TYPECHECKS
  /*
   * These are used to make use of C type-checking..
   */
  typedef struct { unsigned long pte; } pte_t;
  typedef struct { unsigned long pmd; } pmd_t;
#ifdef CONFIG_PGTABLE_4
  typedef struct { unsigned long pud; } pud_t;
#endif
  typedef struct { unsigned long pgd; } pgd_t;
  typedef struct { unsigned long pgprot; } pgprot_t;

# define pte_val(x)	((x).pte)
# define pmd_val(x)	((x).pmd)
#ifdef CONFIG_PGTABLE_4
# define pud_val(x)	((x).pud)
#endif
# define pgd_val(x)	((x).pgd)
# define pgprot_val(x)	((x).pgprot)

# define __pte(x)	((pte_t) { (x) } )
# define __pgprot(x)	((pgprot_t) { (x) } )

#else /* !STRICT_MM_TYPECHECKS */
  /*
   * .. while these make it easier on the compiler
   */
# ifndef __ASSEMBLY__
    typedef unsigned long pte_t;
    typedef unsigned long pmd_t;
    typedef unsigned long pgd_t;
    typedef unsigned long pgprot_t;
# endif

# define pte_val(x)	(x)
# define pmd_val(x)	(x)
# define pgd_val(x)	(x)
# define pgprot_val(x)	(x)

# define __pte(x)	(x)
# define __pgd(x)	(x)
# define __pgprot(x)	(x)
#endif /* !STRICT_MM_TYPECHECKS */

#define PAGE_OFFSET			RGN_BASE(RGN_KERNEL)

#define VM_DATA_DEFAULT_FLAGS		(VM_READ | VM_WRITE |					\
					 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC |		\
					 (((current->personality & READ_IMPLIES_EXEC) != 0)	\
					  ? VM_EXEC : 0))

#endif /* _ASM_IA64_PAGE_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _ASM_IA64_PAGE_H
	2	#define _ASM_IA64_PAGE_H
	3	/*
	4	* Pagetable related stuff.
	5	*
	6	* Copyright (C) 1998, 1999, 2002 Hewlett-Packard Co
	7	* David Mosberger-Tang <davidm@hpl.hp.com>
	8	*/
	9
1da177e4 LT	10	#include <asm/intrinsics.h>
	11	#include <asm/types.h>
	12
0a41e250 PC	13	/*
	14	* The top three bits of an IA64 address are its Region Number.
	15	* Different regions are assigned to different purposes.
	16	*/
	17	#define RGN_SHIFT (61)
1b66776d GE	18	#define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
1b66776d GE	19	#define RGN_BITS (RGN_BASE(-1))
0a41e250	20
0a41e250 PC	21	#define RGN_KERNEL 7 /* Identity mapped region */
	22	#define RGN_UNCACHED 6 /* Identity mapped I/O region */
	23	#define RGN_GATE 5 /* Gate page, Kernel text, etc */
	24	#define RGN_HPAGE 4 /* For Huge TLB pages */
	25
1da177e4 LT	26	/*
	27	* PAGE_SHIFT determines the actual kernel page size.
	28	*/
	29	#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
	30	# define PAGE_SHIFT 12
	31	#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
	32	# define PAGE_SHIFT 13
	33	#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
	34	# define PAGE_SHIFT 14
	35	#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
	36	# define PAGE_SHIFT 16
	37	#else
	38	# error Unsupported page size!
	39	#endif
	40
	41	#define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
	42	#define PAGE_MASK (~(PAGE_SIZE - 1))
	43	#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
	44
	45	#define PERCPU_PAGE_SHIFT 16 /* log2() of max. size of per-CPU area */
	46	#define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
	47
0a41e250	48
1da177e4	49	#ifdef CONFIG_HUGETLB_PAGE
0a41e250	50	# define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
1da177e4 LT	51	# define HPAGE_SHIFT hpage_shift
	52	# define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */
	53	# define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
	54	# define HPAGE_MASK (~(HPAGE_SIZE - 1))
	55
	56	# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
	57	# define ARCH_HAS_HUGEPAGE_ONLY_RANGE
42b88bef	58	# define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
9da61aef	59	# define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
1da177e4 LT	60	#endif /* CONFIG_HUGETLB_PAGE */
	61
	62	#ifdef __ASSEMBLY__
	63	# define __pa(x) ((x) - PAGE_OFFSET)
	64	# define __va(x) ((x) + PAGE_OFFSET)
	65	#else /* !__ASSEMBLY */
1da177e4 LT	66	# define STRICT_MM_TYPECHECKS
	67
	68	extern void clear_page (void *page);
	69	extern void copy_page (void to, void from);
	70
	71	/*
	72	* clear_user_page() and copy_user_page() can't be inline functions because
	73	* flush_dcache_page() can't be defined until later...
	74	*/
	75	#define clear_user_page(addr, vaddr, page) \
	76	do { \
	77	clear_page(addr); \
	78	flush_dcache_page(page); \
	79	} while (0)
	80
	81	#define copy_user_page(to, from, vaddr, page) \
	82	do { \
	83	copy_page((to), (from)); \
	84	flush_dcache_page(page); \
	85	} while (0)
	86
	87
769848c0 MG	88	#define __alloc_zeroed_user_highpage(movableflags, vma, vaddr) \
	89	({ \
	90	struct page *page = alloc_page_vma( \
	91	GFP_HIGHUSER \| __GFP_ZERO \| movableflags, vma, vaddr); \
	92	if (page) \
	93	flush_dcache_page(page); \
	94	page; \
1da177e4 LT	95	})
	96
	97	#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
	98
	99	#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
	100
	101	#ifdef CONFIG_VIRTUAL_MEM_MAP
	102	extern int ia64_pfn_valid (unsigned long pfn);
b0f40ea0	103	#else
1da177e4 LT	104	# define ia64_pfn_valid(pfn) 1
	105	#endif
	106
0ecd702b KH	107	#ifdef CONFIG_VIRTUAL_MEM_MAP
	108	extern struct page *vmem_map;
	109	#ifdef CONFIG_DISCONTIGMEM
	110	# define page_to_pfn(page) ((unsigned long) (page - vmem_map))
	111	# define pfn_to_page(pfn) (vmem_map + (pfn))
b0f40ea0 MW	112	#else
b0f40ea0 MW	113	# include <asm-generic/memory_model.h>
0ecd702b	114	#endif
b0f40ea0 MW	115	#else
b0f40ea0 MW	116	# include <asm-generic/memory_model.h>
0ecd702b KH	117	#endif
0ecd702b KH	118
1be7d993	119	#ifdef CONFIG_FLATMEM
1da177e4	120	# define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
1be7d993	121	#elif defined(CONFIG_DISCONTIGMEM)
b77dae52	122	extern unsigned long min_low_pfn;
1da177e4	123	extern unsigned long max_low_pfn;
b77dae52	124	# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
1da177e4 LT	125	#endif
	126
	127	#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
	128	#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
631bb0e7	129	#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
1da177e4 LT	130
	131	typedef union ia64_va {
	132	struct {
	133	unsigned long off : 61; /* intra-region offset */
	134	unsigned long reg : 3; /* region number */
	135	} f;
	136	unsigned long l;
	137	void *p;
	138	} ia64_va;
	139
	140	/*
	141	* Note: These macros depend on the fact that PAGE_OFFSET has all
	142	* region bits set to 1 and all other bits set to zero. They are
	143	* expressed in this way to ensure they result in a single "dep"
	144	* instruction.
	145	*/
	146	#define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
	147	#define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
	148
	149	#define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
	150	#define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
	151
1da177e4 LT	152	#ifdef CONFIG_HUGETLB_PAGE
	153	# define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
	154	\| (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
	155	# define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
	156	# define is_hugepage_only_range(mm, addr, len) \
2332c9ae	157	(REGION_NUMBER(addr) == RGN_HPAGE \|\| \
0a41e250	158	REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
1da177e4 LT	159	extern unsigned int hpage_shift;
	160	#endif
	161
	162	static __inline__ int
	163	get_order (unsigned long size)
	164	{
	165	long double d = size - 1;
	166	long order;
	167
	168	order = ia64_getf_exp(d);
	169	order = order - PAGE_SHIFT - 0xffff + 1;
	170	if (order < 0)
	171	order = 0;
	172	return order;
	173	}
	174
1da177e4 LT	175	#endif /* !__ASSEMBLY__ */
	176
	177	#ifdef STRICT_MM_TYPECHECKS
	178	/*
	179	* These are used to make use of C type-checking..
	180	*/
	181	typedef struct { unsigned long pte; } pte_t;
	182	typedef struct { unsigned long pmd; } pmd_t;
837cd0bd RH	183	#ifdef CONFIG_PGTABLE_4
	184	typedef struct { unsigned long pud; } pud_t;
	185	#endif
1da177e4 LT	186	typedef struct { unsigned long pgd; } pgd_t;
	187	typedef struct { unsigned long pgprot; } pgprot_t;
	188
	189	# define pte_val(x) ((x).pte)
	190	# define pmd_val(x) ((x).pmd)
837cd0bd RH	191	#ifdef CONFIG_PGTABLE_4
	192	# define pud_val(x) ((x).pud)
	193	#endif
1da177e4 LT	194	# define pgd_val(x) ((x).pgd)
	195	# define pgprot_val(x) ((x).pgprot)
	196
	197	# define __pte(x) ((pte_t) { (x) } )
	198	# define __pgprot(x) ((pgprot_t) { (x) } )
	199
	200	#else /* !STRICT_MM_TYPECHECKS */
	201	/*
	202	* .. while these make it easier on the compiler
	203	*/
	204	# ifndef __ASSEMBLY__
	205	typedef unsigned long pte_t;
	206	typedef unsigned long pmd_t;
	207	typedef unsigned long pgd_t;
	208	typedef unsigned long pgprot_t;
	209	# endif
	210
	211	# define pte_val(x) (x)
	212	# define pmd_val(x) (x)
	213	# define pgd_val(x) (x)
	214	# define pgprot_val(x) (x)
	215
	216	# define __pte(x) (x)
	217	# define __pgd(x) (x)
	218	# define __pgprot(x) (x)
	219	#endif /* !STRICT_MM_TYPECHECKS */
	220
0a41e250	221	#define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
1da177e4 LT	222
	223	#define VM_DATA_DEFAULT_FLAGS (VM_READ \| VM_WRITE \| \
	224	VM_MAYREAD \| VM_MAYWRITE \| VM_MAYEXEC \| \
	225	(((current->personality & READ_IMPLIES_EXEC) != 0) \
	226	? VM_EXEC : 0))
	227
	228	#endif /* _ASM_IA64_PAGE_H */