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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 | ||
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 | ||
50 | #define RGN_MAP_LIMIT ((1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE) /* per region addr limit */ | |
51 | ||
0a41e250 | 52 | |
1da177e4 | 53 | #ifdef CONFIG_HUGETLB_PAGE |
0a41e250 | 54 | # define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE) |
1da177e4 LT |
55 | # define HPAGE_SHIFT hpage_shift |
56 | # define HPAGE_SHIFT_DEFAULT 28 /* check ia64 SDM for architecture supported size */ | |
57 | # define HPAGE_SIZE (__IA64_UL_CONST(1) << HPAGE_SHIFT) | |
58 | # define HPAGE_MASK (~(HPAGE_SIZE - 1)) | |
59 | ||
60 | # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA | |
61 | # define ARCH_HAS_HUGEPAGE_ONLY_RANGE | |
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 | ||
71 | extern void clear_page (void *page); | |
72 | extern 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) \ | |
79 | do { \ | |
80 | clear_page(addr); \ | |
81 | flush_dcache_page(page); \ | |
82 | } while (0) | |
83 | ||
84 | #define copy_user_page(to, from, vaddr, page) \ | |
85 | do { \ | |
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 | |
104 | extern int ia64_pfn_valid (unsigned long pfn); | |
105 | #else | |
106 | # define ia64_pfn_valid(pfn) 1 | |
107 | #endif | |
108 | ||
109 | #ifndef CONFIG_DISCONTIGMEM | |
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)) | |
113 | #else | |
114 | extern struct page *vmem_map; | |
115 | extern unsigned long max_low_pfn; | |
116 | # define pfn_valid(pfn) (((pfn) < max_low_pfn) && ia64_pfn_valid(pfn)) | |
117 | # define page_to_pfn(page) ((unsigned long) (page - vmem_map)) | |
118 | # define pfn_to_page(pfn) (vmem_map + (pfn)) | |
119 | #endif | |
120 | ||
121 | #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT) | |
122 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
123 | ||
124 | typedef union ia64_va { | |
125 | struct { | |
126 | unsigned long off : 61; /* intra-region offset */ | |
127 | unsigned long reg : 3; /* region number */ | |
128 | } f; | |
129 | unsigned long l; | |
130 | void *p; | |
131 | } ia64_va; | |
132 | ||
133 | /* | |
134 | * Note: These macros depend on the fact that PAGE_OFFSET has all | |
135 | * region bits set to 1 and all other bits set to zero. They are | |
136 | * expressed in this way to ensure they result in a single "dep" | |
137 | * instruction. | |
138 | */ | |
139 | #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;}) | |
140 | #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;}) | |
141 | ||
142 | #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;}) | |
143 | #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;}) | |
144 | ||
1da177e4 LT |
145 | #ifdef CONFIG_HUGETLB_PAGE |
146 | # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \ | |
147 | | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT))) | |
148 | # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) | |
149 | # define is_hugepage_only_range(mm, addr, len) \ | |
0a41e250 PC |
150 | (REGION_NUMBER(addr) == RGN_HPAGE && \ |
151 | REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE) | |
1da177e4 LT |
152 | extern unsigned int hpage_shift; |
153 | #endif | |
154 | ||
155 | static __inline__ int | |
156 | get_order (unsigned long size) | |
157 | { | |
158 | long double d = size - 1; | |
159 | long order; | |
160 | ||
161 | order = ia64_getf_exp(d); | |
162 | order = order - PAGE_SHIFT - 0xffff + 1; | |
163 | if (order < 0) | |
164 | order = 0; | |
165 | return order; | |
166 | } | |
167 | ||
168 | # endif /* __KERNEL__ */ | |
169 | #endif /* !__ASSEMBLY__ */ | |
170 | ||
171 | #ifdef STRICT_MM_TYPECHECKS | |
172 | /* | |
173 | * These are used to make use of C type-checking.. | |
174 | */ | |
175 | typedef struct { unsigned long pte; } pte_t; | |
176 | typedef struct { unsigned long pmd; } pmd_t; | |
177 | typedef struct { unsigned long pgd; } pgd_t; | |
178 | typedef struct { unsigned long pgprot; } pgprot_t; | |
179 | ||
180 | # define pte_val(x) ((x).pte) | |
181 | # define pmd_val(x) ((x).pmd) | |
182 | # define pgd_val(x) ((x).pgd) | |
183 | # define pgprot_val(x) ((x).pgprot) | |
184 | ||
185 | # define __pte(x) ((pte_t) { (x) } ) | |
186 | # define __pgprot(x) ((pgprot_t) { (x) } ) | |
187 | ||
188 | #else /* !STRICT_MM_TYPECHECKS */ | |
189 | /* | |
190 | * .. while these make it easier on the compiler | |
191 | */ | |
192 | # ifndef __ASSEMBLY__ | |
193 | typedef unsigned long pte_t; | |
194 | typedef unsigned long pmd_t; | |
195 | typedef unsigned long pgd_t; | |
196 | typedef unsigned long pgprot_t; | |
197 | # endif | |
198 | ||
199 | # define pte_val(x) (x) | |
200 | # define pmd_val(x) (x) | |
201 | # define pgd_val(x) (x) | |
202 | # define pgprot_val(x) (x) | |
203 | ||
204 | # define __pte(x) (x) | |
205 | # define __pgd(x) (x) | |
206 | # define __pgprot(x) (x) | |
207 | #endif /* !STRICT_MM_TYPECHECKS */ | |
208 | ||
0a41e250 | 209 | #define PAGE_OFFSET RGN_BASE(RGN_KERNEL) |
1da177e4 LT |
210 | |
211 | #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ | |
212 | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \ | |
213 | (((current->personality & READ_IMPLIES_EXEC) != 0) \ | |
214 | ? VM_EXEC : 0)) | |
215 | ||
216 | #endif /* _ASM_IA64_PAGE_H */ |