direct-io.hg

view linux-2.6-xen-sparse/include/asm-ia64/page.h @ 13454:8bf7cd060df8

[IA64] Fix warning when building with CONFIG_FLATMEM unset

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author awilliam@xenbuild2.aw
date Thu Jan 04 15:28:16 2007 -0700 (2007-01-04)
parents 5264cc30d711
children 3c8bb086025e
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 /*
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)
20 #define RGN_BASE(r) (__IA64_UL_CONST(r)<<RGN_SHIFT)
21 #define RGN_BITS (RGN_BASE(-1))
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 */
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
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)
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)
51 #ifdef CONFIG_HUGETLB_PAGE
52 # define HPAGE_REGION_BASE RGN_BASE(RGN_HPAGE)
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)
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 })
97 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
99 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
101 #ifdef CONFIG_VIRTUAL_MEM_MAP
102 extern int ia64_pfn_valid (unsigned long pfn);
103 #elif defined(CONFIG_FLATMEM)
104 # define ia64_pfn_valid(pfn) 1
105 #endif
107 #ifdef CONFIG_FLATMEM
108 extern unsigned long max_mapnr;
109 # define pfn_valid(pfn) (((pfn) < max_mapnr) && ia64_pfn_valid(pfn))
110 # define page_to_pfn(page) ((unsigned long) (page - mem_map))
111 # define pfn_to_page(pfn) (mem_map + (pfn))
112 #elif defined(CONFIG_DISCONTIGMEM)
113 extern struct page *vmem_map;
114 extern unsigned long min_low_pfn;
115 extern unsigned long max_low_pfn;
116 # define pfn_valid(pfn) (((pfn) >= min_low_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
121 #ifndef CONFIG_XEN
122 #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)
123 #endif
124 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
125 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
127 typedef union ia64_va {
128 struct {
129 unsigned long off : 61; /* intra-region offset */
130 unsigned long reg : 3; /* region number */
131 } f;
132 unsigned long l;
133 void *p;
134 } ia64_va;
136 /*
137 * Note: These macros depend on the fact that PAGE_OFFSET has all
138 * region bits set to 1 and all other bits set to zero. They are
139 * expressed in this way to ensure they result in a single "dep"
140 * instruction.
141 */
142 #define __pa(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = 0; _v.l;})
143 #define __va(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg = -1; _v.p;})
145 #define REGION_NUMBER(x) ({ia64_va _v; _v.l = (long) (x); _v.f.reg;})
146 #define REGION_OFFSET(x) ({ia64_va _v; _v.l = (long) (x); _v.f.off;})
148 #ifdef CONFIG_HUGETLB_PAGE
149 # define htlbpage_to_page(x) (((unsigned long) REGION_NUMBER(x) << 61) \
150 | (REGION_OFFSET(x) >> (HPAGE_SHIFT-PAGE_SHIFT)))
151 # define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
152 # define is_hugepage_only_range(mm, addr, len) \
153 (REGION_NUMBER(addr) == RGN_HPAGE && \
154 REGION_NUMBER((addr)+(len)-1) == RGN_HPAGE)
155 extern unsigned int hpage_shift;
156 #endif
158 static __inline__ int
159 get_order (unsigned long size)
160 {
161 long double d = size - 1;
162 long order;
164 order = ia64_getf_exp(d);
165 order = order - PAGE_SHIFT - 0xffff + 1;
166 if (order < 0)
167 order = 0;
168 return order;
169 }
171 # endif /* __KERNEL__ */
172 #endif /* !__ASSEMBLY__ */
174 #ifdef STRICT_MM_TYPECHECKS
175 /*
176 * These are used to make use of C type-checking..
177 */
178 typedef struct { unsigned long pte; } pte_t;
179 typedef struct { unsigned long pmd; } pmd_t;
180 #ifdef CONFIG_PGTABLE_4
181 typedef struct { unsigned long pud; } pud_t;
182 #endif
183 typedef struct { unsigned long pgd; } pgd_t;
184 typedef struct { unsigned long pgprot; } pgprot_t;
186 # define pte_val(x) ((x).pte)
187 # define pmd_val(x) ((x).pmd)
188 #ifdef CONFIG_PGTABLE_4
189 # define pud_val(x) ((x).pud)
190 #endif
191 # define pgd_val(x) ((x).pgd)
192 # define pgprot_val(x) ((x).pgprot)
194 # define __pte(x) ((pte_t) { (x) } )
195 # define __pgprot(x) ((pgprot_t) { (x) } )
197 #else /* !STRICT_MM_TYPECHECKS */
198 /*
199 * .. while these make it easier on the compiler
200 */
201 # ifndef __ASSEMBLY__
202 typedef unsigned long pte_t;
203 typedef unsigned long pmd_t;
204 typedef unsigned long pgd_t;
205 typedef unsigned long pgprot_t;
206 # endif
208 # define pte_val(x) (x)
209 # define pmd_val(x) (x)
210 # define pgd_val(x) (x)
211 # define pgprot_val(x) (x)
213 # define __pte(x) (x)
214 # define __pgd(x) (x)
215 # define __pgprot(x) (x)
216 #endif /* !STRICT_MM_TYPECHECKS */
218 #define PAGE_OFFSET RGN_BASE(RGN_KERNEL)
220 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \
221 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC | \
222 (((current->personality & READ_IMPLIES_EXEC) != 0) \
223 ? VM_EXEC : 0))
225 #ifndef __ASSEMBLY__
226 #ifdef CONFIG_XEN
228 #include <linux/kernel.h>
229 #include <asm/hypervisor.h>
230 #include <xen/features.h> // to compile netback, netfront
232 /*
233 * XXX hack!
234 * Linux/IA64 uses PG_arch_1.
235 * This hack will be removed once PG_foreign bit is taken.
236 * #include <xen/foreign_page.h>
237 */
238 #ifdef __ASM_XEN_FOREIGN_PAGE_H__
239 # error "don't include include/xen/foreign_page.h!"
240 #endif
242 extern struct address_space xen_ia64_foreign_dummy_mapping;
243 #define PageForeign(page) \
244 ((page)->mapping == &xen_ia64_foreign_dummy_mapping)
246 #define SetPageForeign(page, dtor) do { \
247 set_page_private((page), (unsigned long)(dtor)); \
248 (page)->mapping = &xen_ia64_foreign_dummy_mapping; \
249 smp_rmb(); \
250 } while (0)
252 #define ClearPageForeign(page) do { \
253 (page)->mapping = NULL; \
254 smp_rmb(); \
255 set_page_private((page), 0); \
256 } while (0)
258 #define PageForeignDestructor(page) \
259 ( (void (*) (struct page *)) page_private(page) )
261 #define arch_free_page(_page,_order) \
262 ({ int foreign = PageForeign(_page); \
263 if (foreign) \
264 (PageForeignDestructor(_page))(_page); \
265 foreign; \
266 })
267 #define HAVE_ARCH_FREE_PAGE
269 #include <asm/maddr.h>
271 #endif /* CONFIG_XEN */
272 #endif /* __ASSEMBLY__ */
274 #endif /* _ASM_IA64_PAGE_H */