[PATCH] unify pfn_to_page: xtensa pfn_to_page
[linux-2.6-block.git] / include / asm-ia64 / page.h
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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
10#include <linux/config.h>
11
12#include <asm/intrinsics.h>
13#include <asm/types.h>
14
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15/*
16 * The top three bits of an IA64 address are its Region Number.
17 * Different regions are assigned to different purposes.
18 */
19#define RGN_SHIFT (61)
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20#define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
21#define RGN_BITS (RGN_BASE(-1))
0a41e250 22
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23#define RGN_KERNEL 7 /* Identity mapped region */
24#define RGN_UNCACHED 6 /* Identity mapped I/O region */
25#define RGN_GATE 5 /* Gate page, Kernel text, etc */
26#define RGN_HPAGE 4 /* For Huge TLB pages */
27
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28/*
29 * PAGE_SHIFT determines the actual kernel page size.
30 */
31#if defined(CONFIG_IA64_PAGE_SIZE_4KB)
32# define PAGE_SHIFT 12
33#elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
34# define PAGE_SHIFT 13
35#elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
36# define PAGE_SHIFT 14
37#elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
38# define PAGE_SHIFT 16
39#else
40# error Unsupported page size!
41#endif
42
43#define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
44#define PAGE_MASK (~(PAGE_SIZE - 1))
45#define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
46
47#define PERCPU_PAGE_SHIFT 16 /* log2() of max. size of per-CPU area */
48#define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
49
0a41e250 50
1da177e4 51#ifdef CONFIG_HUGETLB_PAGE
0a41e250 52# define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
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53# define HPAGE_SHIFT hpage_shift
54# define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */
55# define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT)
56# define HPAGE_MASK (~(HPAGE_SIZE - 1))
57
58# define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
59# define ARCH_HAS_HUGEPAGE_ONLY_RANGE
42b88bef 60# define ARCH_HAS_PREPARE_HUGEPAGE_RANGE
9da61aef 61# define ARCH_HAS_HUGETLB_FREE_PGD_RANGE
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62#endif /* CONFIG_HUGETLB_PAGE */
63
64#ifdef __ASSEMBLY__
65# define __pa(x) ((x) - PAGE_OFFSET)
66# define __va(x) ((x) + PAGE_OFFSET)
67#else /* !__ASSEMBLY */
68# ifdef __KERNEL__
69# define STRICT_MM_TYPECHECKS
70
71extern void clear_page (void *page);
72extern void copy_page (void *to, void *from);
73
74/*
75 * clear_user_page() and copy_user_page() can't be inline functions because
76 * flush_dcache_page() can't be defined until later...
77 */
78#define clear_user_page(addr, vaddr, page) \
79do { \
80 clear_page(addr); \
81 flush_dcache_page(page); \
82} while (0)
83
84#define copy_user_page(to, from, vaddr, page) \
85do { \
86 copy_page((to), (from)); \
87 flush_dcache_page(page); \
88} while (0)
89
90
91#define alloc_zeroed_user_highpage(vma, vaddr) \
92({ \
93 struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
94 if (page) \
95 flush_dcache_page(page); \
96 page; \
97})
98
99#define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
100
101#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
102
103#ifdef CONFIG_VIRTUAL_MEM_MAP
104extern int ia64_pfn_valid (unsigned long pfn);
1be7d993 105#elif defined(CONFIG_FLATMEM)
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106# define ia64_pfn_valid(pfn) 1
107#endif
108
1be7d993 109#ifdef CONFIG_FLATMEM
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110# define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
111# define page_to_pfn(page) ((unsigned long) (page - mem_map))
112# define pfn_to_page(pfn) (mem_map + (pfn))
1be7d993 113#elif defined(CONFIG_DISCONTIGMEM)
1da177e4 114extern struct page *vmem_map;
b77dae52 115extern unsigned long min_low_pfn;
1da177e4 116extern unsigned long max_low_pfn;
b77dae52 117# define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
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118# define page_to_pfn(page) ((unsigned long) (page - vmem_map))
119# define pfn_to_page(pfn) (vmem_map + (pfn))
120#endif
121
122#define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
123#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
631bb0e7 124#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
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125
126typedef union ia64_va {
127 struct {
128 unsigned long off : 61; /* intra-region offset */
129 unsigned long reg : 3; /* region number */
130 } f;
131 unsigned long l;
132 void *p;
133} ia64_va;
134
135/*
136 * Note: These macros depend on the fact that PAGE_OFFSET has all
137 * region bits set to 1 and all other bits set to zero. They are
138 * expressed in this way to ensure they result in a single "dep"
139 * instruction.
140 */
141#define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
142#define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
143
144#define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
145#define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
146
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147#ifdef CONFIG_HUGETLB_PAGE
148# define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
149 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
150# define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
151# define is_hugepage_only_range(mm, addr, len) \
2332c9ae 152 (REGION_NUMBER(addr) == RGN_HPAGE || \
0a41e250 153 REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
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154extern unsigned int hpage_shift;
155#endif
156
157static __inline__ int
158get_order (unsigned long size)
159{
160 long double d = size - 1;
161 long order;
162
163 order = ia64_getf_exp(d);
164 order = order - PAGE_SHIFT - 0xffff + 1;
165 if (order < 0)
166 order = 0;
167 return order;
168}
169
170# endif /* __KERNEL__ */
171#endif /* !__ASSEMBLY__ */
172
173#ifdef STRICT_MM_TYPECHECKS
174 /*
175 * These are used to make use of C type-checking..
176 */
177 typedef struct { unsigned long pte; } pte_t;
178 typedef struct { unsigned long pmd; } pmd_t;
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RH
179#ifdef CONFIG_PGTABLE_4
180 typedef struct { unsigned long pud; } pud_t;
181#endif
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182 typedef struct { unsigned long pgd; } pgd_t;
183 typedef struct { unsigned long pgprot; } pgprot_t;
184
185# define pte_val(x) ((x).pte)
186# define pmd_val(x) ((x).pmd)
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187#ifdef CONFIG_PGTABLE_4
188# define pud_val(x) ((x).pud)
189#endif
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190# define pgd_val(x) ((x).pgd)
191# define pgprot_val(x) ((x).pgprot)
192
193# define __pte(x) ((pte_t) { (x) } )
194# define __pgprot(x) ((pgprot_t) { (x) } )
195
196#else /* !STRICT_MM_TYPECHECKS */
197 /*
198 * .. while these make it easier on the compiler
199 */
200# ifndef __ASSEMBLY__
201 typedef unsigned long pte_t;
202 typedef unsigned long pmd_t;
203 typedef unsigned long pgd_t;
204 typedef unsigned long pgprot_t;
205# endif
206
207# define pte_val(x) (x)
208# define pmd_val(x) (x)
209# define pgd_val(x) (x)
210# define pgprot_val(x) (x)
211
212# define __pte(x) (x)
213# define __pgd(x) (x)
214# define __pgprot(x) (x)
215#endif /* !STRICT_MM_TYPECHECKS */
216
0a41e250 217#define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
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218
219#define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
220 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
221 (((current->personality & READ_IMPLIES_EXEC) != 0) \
222 ? VM_EXEC : 0))
223
224#endif /* _ASM_IA64_PAGE_H */