summaryrefslogtreecommitdiffstats
path: root/include/asm-ia64/page.h
blob: 9d41548b7fef43d1f98abbbb1a5dfaa371c9a031 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
#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 <linux/config.h>

#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)

#define RGN_MAP_LIMIT	((1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE)	/* per region addr limit */


#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
#endif /* CONFIG_HUGETLB_PAGE */

#ifdef __ASSEMBLY__
# define __pa(x)		((x) - PAGE_OFFSET)
# define __va(x)		((x) + PAGE_OFFSET)
#else /* !__ASSEMBLY */
# ifdef __KERNEL__
#  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(vma, vaddr) \
({						\
	struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, 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);
#elif defined(CONFIG_FLATMEM)
# define ia64_pfn_valid(pfn) 1
#endif

#ifdef CONFIG_FLATMEM
# define pfn_valid(pfn)		(((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
# define page_to_pfn(page)	((unsigned long) (page - mem_map))
# define pfn_to_page(pfn)	(mem_map + (pfn))
#elif defined(CONFIG_DISCONTIGMEM)
extern struct page *vmem_map;
extern unsigned long max_low_pfn;
# define pfn_valid(pfn)		(((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
# define page_to_pfn(page)	((unsigned long) (page - vmem_map))
# define pfn_to_page(pfn)	(vmem_map + (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 /* __KERNEL__ */
#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;
  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)
# 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 */