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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 | ||
d5759641 | 10 | # ifdef __KERNEL__ |
1da177e4 LT |
11 | |
12 | #include <asm/intrinsics.h> | |
13 | #include <asm/types.h> | |
14 | ||
0a41e250 PC |
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) | |
1b66776d GE |
20 | #define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT) |
21 | #define RGN_BITS (RGN_BASE(-1)) | |
0a41e250 | 22 | |
0a41e250 PC |
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 | ||
1da177e4 LT |
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) |
1da177e4 LT |
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 |
1da177e4 LT |
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 */ | |
1da177e4 LT |
68 | # define STRICT_MM_TYPECHECKS |
69 | ||
70 | extern void clear_page (void *page); | |
71 | extern void copy_page (void *to, void *from); | |
72 | ||
73 | /* | |
74 | * clear_user_page() and copy_user_page() can't be inline functions because | |
75 | * flush_dcache_page() can't be defined until later... | |
76 | */ | |
77 | #define clear_user_page(addr, vaddr, page) \ | |
78 | do { \ | |
79 | clear_page(addr); \ | |
80 | flush_dcache_page(page); \ | |
81 | } while (0) | |
82 | ||
83 | #define copy_user_page(to, from, vaddr, page) \ | |
84 | do { \ | |
85 | copy_page((to), (from)); \ | |
86 | flush_dcache_page(page); \ | |
87 | } while (0) | |
88 | ||
89 | ||
90 | #define alloc_zeroed_user_highpage(vma, vaddr) \ | |
91 | ({ \ | |
92 | struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \ | |
93 | if (page) \ | |
94 | flush_dcache_page(page); \ | |
95 | page; \ | |
96 | }) | |
97 | ||
98 | #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE | |
99 | ||
100 | #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) | |
101 | ||
102 | #ifdef CONFIG_VIRTUAL_MEM_MAP | |
103 | extern int ia64_pfn_valid (unsigned long pfn); | |
b0f40ea0 | 104 | #else |
1da177e4 LT |
105 | # define ia64_pfn_valid(pfn) 1 |
106 | #endif | |
107 | ||
0ecd702b KH |
108 | #ifdef CONFIG_VIRTUAL_MEM_MAP |
109 | extern struct page *vmem_map; | |
110 | #ifdef CONFIG_DISCONTIGMEM | |
111 | # define page_to_pfn(page) ((unsigned long) (page - vmem_map)) | |
112 | # define pfn_to_page(pfn) (vmem_map + (pfn)) | |
b0f40ea0 MW |
113 | #else |
114 | # include <asm-generic/memory_model.h> | |
0ecd702b | 115 | #endif |
b0f40ea0 MW |
116 | #else |
117 | # include <asm-generic/memory_model.h> | |
0ecd702b KH |
118 | #endif |
119 | ||
1be7d993 | 120 | #ifdef CONFIG_FLATMEM |
1da177e4 | 121 | # define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn)) |
1be7d993 | 122 | #elif defined(CONFIG_DISCONTIGMEM) |
b77dae52 | 123 | extern unsigned long min_low_pfn; |
1da177e4 | 124 | extern unsigned long max_low_pfn; |
b77dae52 | 125 | # define pfn_valid(pfn) (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn)) |
1da177e4 LT |
126 | #endif |
127 | ||
128 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
129 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
631bb0e7 | 130 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) |
1da177e4 LT |
131 | |
132 | typedef union ia64_va { | |
133 | struct { | |
134 | unsigned long off : 61; /* intra-region offset */ | |
135 | unsigned long reg : 3; /* region number */ | |
136 | } f; | |
137 | unsigned long l; | |
138 | void *p; | |
139 | } ia64_va; | |
140 | ||
141 | /* | |
142 | * Note: These macros depend on the fact that PAGE_OFFSET has all | |
143 | * region bits set to 1 and all other bits set to zero. They are | |
144 | * expressed in this way to ensure they result in a single "dep" | |
145 | * instruction. | |
146 | */ | |
147 | #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;}) | |
148 | #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;}) | |
149 | ||
150 | #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;}) | |
151 | #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;}) | |
152 | ||
1da177e4 LT |
153 | #ifdef CONFIG_HUGETLB_PAGE |
154 | # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \ | |
155 | | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT))) | |
156 | # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
157 | # define is_hugepage_only_range(mm, addr, len) \ | |
2332c9ae | 158 | (REGION_NUMBER(addr) == RGN_HPAGE || \ |
0a41e250 | 159 | REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE) |
1da177e4 LT |
160 | extern unsigned int hpage_shift; |
161 | #endif | |
162 | ||
163 | static __inline__ int | |
164 | get_order (unsigned long size) | |
165 | { | |
166 | long double d = size - 1; | |
167 | long order; | |
168 | ||
169 | order = ia64_getf_exp(d); | |
170 | order = order - PAGE_SHIFT - 0xffff + 1; | |
171 | if (order < 0) | |
172 | order = 0; | |
173 | return order; | |
174 | } | |
175 | ||
1da177e4 LT |
176 | #endif /* !__ASSEMBLY__ */ |
177 | ||
178 | #ifdef STRICT_MM_TYPECHECKS | |
179 | /* | |
180 | * These are used to make use of C type-checking.. | |
181 | */ | |
182 | typedef struct { unsigned long pte; } pte_t; | |
183 | typedef struct { unsigned long pmd; } pmd_t; | |
837cd0bd RH |
184 | #ifdef CONFIG_PGTABLE_4 |
185 | typedef struct { unsigned long pud; } pud_t; | |
186 | #endif | |
1da177e4 LT |
187 | typedef struct { unsigned long pgd; } pgd_t; |
188 | typedef struct { unsigned long pgprot; } pgprot_t; | |
189 | ||
190 | # define pte_val(x) ((x).pte) | |
191 | # define pmd_val(x) ((x).pmd) | |
837cd0bd RH |
192 | #ifdef CONFIG_PGTABLE_4 |
193 | # define pud_val(x) ((x).pud) | |
194 | #endif | |
1da177e4 LT |
195 | # define pgd_val(x) ((x).pgd) |
196 | # define pgprot_val(x) ((x).pgprot) | |
197 | ||
198 | # define __pte(x) ((pte_t) { (x) } ) | |
199 | # define __pgprot(x) ((pgprot_t) { (x) } ) | |
200 | ||
201 | #else /* !STRICT_MM_TYPECHECKS */ | |
202 | /* | |
203 | * .. while these make it easier on the compiler | |
204 | */ | |
205 | # ifndef __ASSEMBLY__ | |
206 | typedef unsigned long pte_t; | |
207 | typedef unsigned long pmd_t; | |
208 | typedef unsigned long pgd_t; | |
209 | typedef unsigned long pgprot_t; | |
210 | # endif | |
211 | ||
212 | # define pte_val(x) (x) | |
213 | # define pmd_val(x) (x) | |
214 | # define pgd_val(x) (x) | |
215 | # define pgprot_val(x) (x) | |
216 | ||
217 | # define __pte(x) (x) | |
218 | # define __pgd(x) (x) | |
219 | # define __pgprot(x) (x) | |
220 | #endif /* !STRICT_MM_TYPECHECKS */ | |
221 | ||
0a41e250 | 222 | #define PAGE_OFFSET RGN_BASE(RGN_KERNEL) |
1da177e4 LT |
223 | |
224 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ | |
225 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \ | |
226 | (((current->personality & READ_IMPLIES_EXEC) != 0) \ | |
227 | ? VM_EXEC : 0)) | |
228 | ||
d5759641 | 229 | # endif /* __KERNEL__ */ |
1da177e4 | 230 | #endif /* _ASM_IA64_PAGE_H */ |