debuggers.hg

view xen/include/asm-ia64/linux-xen/asm/page.h @ 0:7d21f7218375

Exact replica of unstable on 051908 + README-this
author Mukesh Rathor
date Mon May 19 15:34:57 2008 -0700 (2008-05-19)
parents
children f875aaa791f0
line source
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 */
10 #include <linux/config.h>
12 #include <asm/intrinsics.h>
13 #include <asm/types.h>
15 #ifdef XEN /* This will go away with newer upstream */
16 #define RGN_SHIFT 61
17 #define RGN_BASE(r) (r << RGN_SHIFT)
18 #define RGN_BITS RGN_BASE(-1)
19 #define RGN_HPAGE REGION_HPAGE
20 #ifndef CONFIG_HUGETLB_PAGE
21 # define REGION_HPAGE (4UL)
22 #endif
23 #endif
25 /*
26 * PAGE_SHIFT determines the actual kernel page size.
27 */
28 #if defined(CONFIG_IA64_PAGE_SIZE_4KB)
29 # define PAGE_SHIFT 12
30 #elif defined(CONFIG_IA64_PAGE_SIZE_8KB)
31 # define PAGE_SHIFT 13
32 #elif defined(CONFIG_IA64_PAGE_SIZE_16KB)
33 # define PAGE_SHIFT 14
34 #elif defined(CONFIG_IA64_PAGE_SIZE_64KB)
35 # define PAGE_SHIFT 16
36 #else
37 # error Unsupported page size!
38 #endif
40 #define PAGE_SIZE (__IA64_UL_CONST(1) << PAGE_SHIFT)
41 #define PAGE_MASK (~(PAGE_SIZE - 1))
42 #define PAGE_ALIGN(addr) (((addr) + PAGE_SIZE - 1) & PAGE_MASK)
44 #define PERCPU_PAGE_SHIFT 16 /* log2() of max. size of per-CPU area */
45 #define PERCPU_PAGE_SIZE (__IA64_UL_CONST(1) << PERCPU_PAGE_SHIFT)
47 #define RGN_MAP_LIMIT ((1UL << (4*PAGE_SHIFT - 12)) - PAGE_SIZE) /* per region addr limit */
49 #ifdef CONFIG_HUGETLB_PAGE
50 # define REGION_HPAGE (4UL) /* note: this is hardcoded in reload_context()!*/
51 # define REGION_SHIFT 61
52 # define HPAGE_REGION_BASE (REGION_HPAGE << REGION_SHIFT)
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))
58 # define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
59 # define ARCH_HAS_HUGEPAGE_ONLY_RANGE
60 #endif /* CONFIG_HUGETLB_PAGE */
62 #ifdef __ASSEMBLY__
63 # define __pa(x) ((x) - PAGE_OFFSET)
64 # define __va(x) ((x) + PAGE_OFFSET)
65 #else /* !__ASSEMBLY */
66 # ifdef __KERNEL__
67 # define STRICT_MM_TYPECHECKS
69 extern void clear_page (void *page);
70 extern void copy_page (void *to, void *from);
72 /*
73 * clear_user_page() and copy_user_page() can't be inline functions because
74 * flush_dcache_page() can't be defined until later...
75 */
76 #define clear_user_page(addr, vaddr, page) \
77 do { \
78 clear_page(addr); \
79 flush_dcache_page(page); \
80 } while (0)
82 #define copy_user_page(to, from, vaddr, page) \
83 do { \
84 copy_page((to), (from)); \
85 flush_dcache_page(page); \
86 } while (0)
88 #ifndef XEN
89 #define alloc_zeroed_user_highpage(vma, vaddr) \
90 ({ \
91 struct page *page = alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr); \
92 if (page) \
93 flush_dcache_page(page); \
94 page; \
95 })
96 #endif
98 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
100 #define virt_addr_valid(kaddr) mfn_valid(__pa(kaddr) >> PAGE_SHIFT)
102 #ifdef CONFIG_VIRTUAL_MEM_MAP
103 extern int ia64_mfn_valid (unsigned long pfn);
104 #else
105 # define ia64_mfn_valid(pfn) 1
106 #endif
108 #ifndef CONFIG_DISCONTIGMEM
109 # define mfn_valid(pfn) (((pfn) < max_mapnr) && ia64_mfn_valid(pfn))
110 # define page_to_mfn(page) ((unsigned long) (page - mem_map))
111 # define mfn_to_page(pfn) (mem_map + (pfn))
112 #else
113 extern struct page *vmem_map;
114 extern unsigned long max_low_pfn;
115 # define mfn_valid(pfn) (((pfn) < max_low_pfn) && ia64_mfn_valid(pfn))
116 # define page_to_mfn(page) ((unsigned long) (page - vmem_map))
117 # define mfn_to_page(pfn) (vmem_map + (pfn))
118 #endif
120 #define page_to_maddr(page) (page_to_mfn(page) << PAGE_SHIFT)
121 #define virt_to_page(kaddr) mfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
123 typedef union ia64_va {
124 struct {
125 unsigned long off : 61; /* intra-region offset */
126 unsigned long reg : 3; /* region number */
127 } f;
128 unsigned long l;
129 void *p;
130 } ia64_va;
132 #ifndef XEN
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 #endif /* XEN */
143 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
144 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
146 #define REGION_SIZE REGION_NUMBER(1)
147 #define REGION_KERNEL 7
149 #ifdef CONFIG_HUGETLB_PAGE
150 # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
151 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
152 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
153 # define is_hugepage_only_range(mm, addr, len) \
154 (REGION_NUMBER(addr) == REGION_HPAGE && \
155 REGION_NUMBER((addr)+(len)-1) == REGION_HPAGE)
156 extern unsigned int hpage_shift;
157 #endif
159 static __inline__ int
160 get_order (unsigned long size)
161 {
162 long double d = size - 1;
163 long order;
165 order = ia64_getf_exp(d);
166 order = order - PAGE_SHIFT - 0xffff + 1;
167 if (order < 0)
168 order = 0;
169 return order;
170 }
172 # endif /* __KERNEL__ */
173 #endif /* !__ASSEMBLY__ */
175 #ifdef STRICT_MM_TYPECHECKS
176 /*
177 * These are used to make use of C type-checking..
178 */
179 typedef struct { unsigned long pte; } pte_t;
180 typedef struct { unsigned long pmd; } pmd_t;
181 typedef struct { unsigned long pgd; } pgd_t;
182 typedef struct { unsigned long pgprot; } pgprot_t;
184 # define pte_val(x) ((x).pte)
185 # define pmd_val(x) ((x).pmd)
186 # define pgd_val(x) ((x).pgd)
187 # define pgprot_val(x) ((x).pgprot)
189 # define __pte(x) ((pte_t) { (x) } )
190 # define __pgprot(x) ((pgprot_t) { (x) } )
192 #else /* !STRICT_MM_TYPECHECKS */
193 /*
194 * .. while these make it easier on the compiler
195 */
196 # ifndef __ASSEMBLY__
197 typedef unsigned long pte_t;
198 typedef unsigned long pmd_t;
199 typedef unsigned long pgd_t;
200 typedef unsigned long pgprot_t;
201 # endif
203 # define pte_val(x) (x)
204 # define pmd_val(x) (x)
205 # define pgd_val(x) (x)
206 # define pgprot_val(x) (x)
208 # define __pte(x) (x)
209 # define __pgd(x) (x)
210 # define __pgprot(x) (x)
211 #endif /* !STRICT_MM_TYPECHECKS */
213 #ifndef XEN
214 #define PAGE_OFFSET __IA64_UL_CONST(0xe000000000000000)
216 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
217 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
218 (((current->personality & READ_IMPLIES_EXEC) != 0) \
219 ? VM_EXEC : 0))
221 #else
222 #include <asm/xenpage.h>
223 #endif
225 #endif /* _ASM_IA64_PAGE_H */