ia64/xen-unstable

view linux-2.6-xen-sparse/include/asm-xen/asm-x86_64/page.h @ 6435:b4b3f6be5226

merge?
author cl349@firebug.cl.cam.ac.uk
date Thu Aug 25 17:27:49 2005 +0000 (2005-08-25)
parents 0610add7c3fe b88c5350de57
children 8799d14bef77 9312a3e8a6f8 112d44270733
line source
1 #ifndef _X86_64_PAGE_H
2 #define _X86_64_PAGE_H
4 #include <linux/config.h>
5 /* #include <linux/string.h> */
6 #ifndef __ASSEMBLY__
7 #include <linux/types.h>
8 #endif
9 #include <asm-xen/xen-public/xen.h>
10 #include <asm-xen/foreign_page.h>
12 #define arch_free_page(_page,_order) \
13 ({ int foreign = PageForeign(_page); \
14 if (foreign) \
15 (PageForeignDestructor(_page))(_page); \
16 foreign; \
17 })
18 #define HAVE_ARCH_FREE_PAGE
20 #ifdef CONFIG_XEN_SCRUB_PAGES
21 #define scrub_pages(_p,_n) memset((void *)(_p), 0, (_n) << PAGE_SHIFT)
22 #else
23 #define scrub_pages(_p,_n) ((void)0)
24 #endif
26 /* PAGE_SHIFT determines the page size */
27 #define PAGE_SHIFT 12
28 #ifdef __ASSEMBLY__
29 #define PAGE_SIZE (0x1 << PAGE_SHIFT)
30 #else
31 #define PAGE_SIZE (1UL << PAGE_SHIFT)
32 #endif
33 #define PAGE_MASK (~(PAGE_SIZE-1))
34 #define PHYSICAL_PAGE_MASK (~(PAGE_SIZE-1) & (__PHYSICAL_MASK << PAGE_SHIFT))
36 #define THREAD_ORDER 1
37 #ifdef __ASSEMBLY__
38 #define THREAD_SIZE (1 << (PAGE_SHIFT + THREAD_ORDER))
39 #else
40 #define THREAD_SIZE (1UL << (PAGE_SHIFT + THREAD_ORDER))
41 #endif
42 #define CURRENT_MASK (~(THREAD_SIZE-1))
44 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
45 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
47 #define HPAGE_SHIFT PMD_SHIFT
48 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
49 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
50 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
52 #ifdef __KERNEL__
53 #ifndef __ASSEMBLY__
55 void clear_page(void *);
56 void copy_page(void *, void *);
58 #define clear_user_page(page, vaddr, pg) clear_page(page)
59 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
61 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
62 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
64 /**** MACHINE <-> PHYSICAL CONVERSION MACROS ****/
65 #define INVALID_P2M_ENTRY (~0U)
66 #define FOREIGN_FRAME(m) ((m) | 0x80000000U)
67 extern u32 *phys_to_machine_mapping;
68 #define pfn_to_mfn(pfn) \
69 ((unsigned long)phys_to_machine_mapping[(unsigned int)(pfn)] & 0x7FFFFFFFUL)
70 static inline unsigned long mfn_to_pfn(unsigned long mfn)
71 {
72 unsigned int pfn;
74 /*
75 * The array access can fail (e.g., device space beyond end of RAM).
76 * In such cases it doesn't matter what we return (we return garbage),
77 * but we must handle the fault without crashing!
78 */
79 asm (
80 "1: movl %1,%k0\n"
81 "2:\n"
82 ".section __ex_table,\"a\"\n"
83 " .align 8\n"
84 " .quad 1b,2b\n"
85 ".previous"
86 : "=r" (pfn) : "m" (machine_to_phys_mapping[mfn]) );
88 return (unsigned long)pfn;
89 }
91 /* Definitions for machine and pseudophysical addresses. */
92 typedef unsigned long paddr_t;
93 typedef unsigned long maddr_t;
95 static inline maddr_t phys_to_machine(paddr_t phys)
96 {
97 maddr_t machine = pfn_to_mfn(phys >> PAGE_SHIFT);
98 machine = (machine << PAGE_SHIFT) | (phys & ~PAGE_MASK);
99 return machine;
100 }
102 static inline paddr_t machine_to_phys(maddr_t machine)
103 {
104 paddr_t phys = mfn_to_pfn(machine >> PAGE_SHIFT);
105 phys = (phys << PAGE_SHIFT) | (machine & ~PAGE_MASK);
106 return phys;
107 }
109 /*
110 * These are used to make use of C type-checking..
111 */
112 typedef struct { unsigned long pte; } pte_t;
113 typedef struct { unsigned long pmd; } pmd_t;
114 typedef struct { unsigned long pud; } pud_t;
115 typedef struct { unsigned long pgd; } pgd_t;
116 #define PTE_MASK PHYSICAL_PAGE_MASK
118 typedef struct { unsigned long pgprot; } pgprot_t;
120 #define pte_val(x) (((x).pte & 1) ? machine_to_phys((x).pte) : \
121 (x).pte)
122 #define pte_val_ma(x) ((x).pte)
124 static inline unsigned long pmd_val(pmd_t x)
125 {
126 unsigned long ret = x.pmd;
127 if (ret) ret = machine_to_phys(ret);
128 return ret;
129 }
131 static inline unsigned long pud_val(pud_t x)
132 {
133 unsigned long ret = x.pud;
134 if (ret) ret = machine_to_phys(ret);
135 return ret;
136 }
138 static inline unsigned long pgd_val(pgd_t x)
139 {
140 unsigned long ret = x.pgd;
141 if (ret) ret = machine_to_phys(ret);
142 return ret;
143 }
145 #define pgprot_val(x) ((x).pgprot)
147 #define __pte_ma(x) ((pte_t) { (x) } )
149 static inline pte_t __pte(unsigned long x)
150 {
151 if (x & 1) x = phys_to_machine(x);
152 return ((pte_t) { (x) });
153 }
155 static inline pmd_t __pmd(unsigned long x)
156 {
157 if ((x & 1)) x = phys_to_machine(x);
158 return ((pmd_t) { (x) });
159 }
161 static inline pud_t __pud(unsigned long x)
162 {
163 if ((x & 1)) x = phys_to_machine(x);
164 return ((pud_t) { (x) });
165 }
167 static inline pgd_t __pgd(unsigned long x)
168 {
169 if ((x & 1)) x = phys_to_machine(x);
170 return ((pgd_t) { (x) });
171 }
173 #define __pgprot(x) ((pgprot_t) { (x) } )
175 #define __START_KERNEL 0xffffffff80100000UL
176 #define __START_KERNEL_map 0xffffffff80000000UL
177 #define __PAGE_OFFSET 0xffff880000000000UL
179 #else
180 #define __START_KERNEL 0xffffffff80100000
181 #define __START_KERNEL_map 0xffffffff80000000
182 #define __PAGE_OFFSET 0xffff880000000000
183 #endif /* !__ASSEMBLY__ */
185 /* to align the pointer to the (next) page boundary */
186 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
188 /* See Documentation/x86_64/mm.txt for a description of the memory map. */
189 #define __PHYSICAL_MASK_SHIFT 46
190 #define __PHYSICAL_MASK ((1UL << __PHYSICAL_MASK_SHIFT) - 1)
191 #define __VIRTUAL_MASK_SHIFT 48
192 #define __VIRTUAL_MASK ((1UL << __VIRTUAL_MASK_SHIFT) - 1)
194 #define KERNEL_TEXT_SIZE (40UL*1024*1024)
195 #define KERNEL_TEXT_START 0xffffffff80000000UL
197 #ifndef __ASSEMBLY__
199 #include <asm/bug.h>
201 /* Pure 2^n version of get_order */
202 extern __inline__ int get_order(unsigned long size)
203 {
204 int order;
206 size = (size-1) >> (PAGE_SHIFT-1);
207 order = -1;
208 do {
209 size >>= 1;
210 order++;
211 } while (size);
212 return order;
213 }
215 #endif /* __ASSEMBLY__ */
217 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
219 /* Note: __pa(&symbol_visible_to_c) should be always replaced with __pa_symbol.
220 Otherwise you risk miscompilation. */
221 #define __pa(x) (((unsigned long)(x)>=__START_KERNEL_map)?(unsigned long)(x) - (unsigned long)__START_KERNEL_map:(unsigned long)(x) - PAGE_OFFSET)
222 /* __pa_symbol should be used for C visible symbols.
223 This seems to be the official gcc blessed way to do such arithmetic. */
224 #define __pa_symbol(x) \
225 ({unsigned long v; \
226 asm("" : "=r" (v) : "0" (x)); \
227 __pa(v); })
229 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
230 #ifndef CONFIG_DISCONTIGMEM
231 #define pfn_to_page(pfn) (mem_map + (pfn))
232 #define page_to_pfn(page) ((unsigned long)((page) - mem_map))
233 #define pfn_valid(pfn) ((pfn) < max_mapnr)
234 #endif
236 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
237 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
238 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
240 /* VIRT <-> MACHINE conversion */
241 #define virt_to_machine(v) (phys_to_machine(__pa(v)))
242 #define machine_to_virt(m) (__va(machine_to_phys(m)))
243 #define virt_to_mfn(v) (pfn_to_mfn(__pa(v) >> PAGE_SHIFT))
244 #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
246 #define VM_DATA_DEFAULT_FLAGS \
247 (((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
248 VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
250 #define __HAVE_ARCH_GATE_AREA 1
252 #endif /* __KERNEL__ */
254 #endif /* _X86_64_PAGE_H */