4 /* PAGE_SHIFT determines the page size */
6 #define PAGE_SIZE (1UL << PAGE_SHIFT)
7 #define PAGE_MASK (~(PAGE_SIZE-1))
9 #define LARGE_PAGE_MASK (~(LARGE_PAGE_SIZE-1))
10 #define LARGE_PAGE_SIZE (1UL << PMD_SHIFT)
15 #include <linux/string.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
19 #include <xen/interface/xen.h>
20 #include <xen/features.h>
21 #include <xen/foreign_page.h>
23 #define arch_free_page(_page,_order) \
24 ({ int foreign = PageForeign(_page); \
26 (PageForeignDestructor(_page))(_page); \
29 #define HAVE_ARCH_FREE_PAGE
31 #ifdef CONFIG_XEN_SCRUB_PAGES
32 #define scrub_pages(_p,_n) memset((void *)(_p), 0, (_n) << PAGE_SHIFT)
34 #define scrub_pages(_p,_n) ((void)0)
37 #ifdef CONFIG_X86_USE_3DNOW
41 #define clear_page(page) mmx_clear_page((void *)(page))
42 #define copy_page(to,from) mmx_copy_page(to,from)
46 #define alloc_zeroed_user_highpage(vma, vaddr) alloc_page_vma(GFP_HIGHUSER | __GFP_ZERO, vma, vaddr)
47 #define __HAVE_ARCH_ALLOC_ZEROED_USER_HIGHPAGE
50 * On older X86 processors it's not a win to use MMX here it seems.
54 #define clear_page(page) memset((void *)(page), 0, PAGE_SIZE)
55 #define copy_page(to,from) memcpy((void *)(to), (void *)(from), PAGE_SIZE)
59 #define clear_user_page(page, vaddr, pg) clear_page(page)
60 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
63 * These are used to make use of C type-checking..
65 extern int nx_enabled;
67 extern unsigned long long __supported_pte_mask;
68 typedef struct { unsigned long pte_low, pte_high; } pte_t;
69 typedef struct { unsigned long long pmd; } pmd_t;
70 typedef struct { unsigned long long pgd; } pgd_t;
71 typedef struct { unsigned long long pgprot; } pgprot_t;
72 #define pgprot_val(x) ((x).pgprot)
73 #include <asm/maddr.h>
74 #define __pte(x) ({ unsigned long long _x = (x); \
75 if (_x & 1) _x = phys_to_machine(_x); \
76 ((pte_t) {(unsigned long)(_x), (unsigned long)(_x>>32)}); })
77 #define __pgd(x) ({ unsigned long long _x = (x); \
78 (((_x)&1) ? ((pgd_t) {phys_to_machine(_x)}) : ((pgd_t) {(_x)})); })
79 #define __pmd(x) ({ unsigned long long _x = (x); \
80 (((_x)&1) ? ((pmd_t) {phys_to_machine(_x)}) : ((pmd_t) {(_x)})); })
81 static inline unsigned long long pte_val(pte_t x)
83 unsigned long long ret;
86 ret = x.pte_low | (unsigned long long)x.pte_high << 32;
87 ret = machine_to_phys(ret) | 1;
93 static inline unsigned long long pmd_val(pmd_t x)
95 unsigned long long ret = x.pmd;
96 if (ret) ret = machine_to_phys(ret) | 1;
99 static inline unsigned long long pgd_val(pgd_t x)
101 unsigned long long ret = x.pgd;
102 if (ret) ret = machine_to_phys(ret) | 1;
105 static inline unsigned long long pte_val_ma(pte_t x)
107 return (unsigned long long)x.pte_high << 32 | x.pte_low;
109 #define HPAGE_SHIFT 21
111 typedef struct { unsigned long pte_low; } pte_t;
112 typedef struct { unsigned long pgd; } pgd_t;
113 typedef struct { unsigned long pgprot; } pgprot_t;
114 #define pgprot_val(x) ((x).pgprot)
115 #include <asm/maddr.h>
116 #define boot_pte_t pte_t /* or would you rather have a typedef */
117 #define pte_val(x) (((x).pte_low & 1) ? machine_to_phys((x).pte_low) : \
119 #define pte_val_ma(x) ((x).pte_low)
120 #define __pte(x) ({ unsigned long _x = (x); \
121 (((_x)&1) ? ((pte_t) {phys_to_machine(_x)}) : ((pte_t) {(_x)})); })
122 #define __pgd(x) ({ unsigned long _x = (x); \
123 (((_x)&1) ? ((pgd_t) {phys_to_machine(_x)}) : ((pgd_t) {(_x)})); })
124 static inline unsigned long pgd_val(pgd_t x)
126 unsigned long ret = x.pgd;
127 if (ret) ret = machine_to_phys(ret) | 1;
130 #define HPAGE_SHIFT 22
132 #define PTE_MASK PAGE_MASK
134 #ifdef CONFIG_HUGETLB_PAGE
135 #define HPAGE_SIZE ((1UL) << HPAGE_SHIFT)
136 #define HPAGE_MASK (~(HPAGE_SIZE - 1))
137 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
138 #define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
141 #define __pgprot(x) ((pgprot_t) { (x) } )
143 #endif /* !__ASSEMBLY__ */
145 /* to align the pointer to the (next) page boundary */
146 #define PAGE_ALIGN(addr) (((addr)+PAGE_SIZE-1)&PAGE_MASK)
149 * This handles the memory map.. We could make this a config
150 * option, but too many people screw it up, and too few need
153 * A __PAGE_OFFSET of 0xC0000000 means that the kernel has
154 * a virtual address space of one gigabyte, which limits the
155 * amount of physical memory you can use to about 950MB.
157 * If you want more physical memory than this then see the CONFIG_HIGHMEM4G
158 * and CONFIG_HIGHMEM64G options in the kernel configuration.
163 struct vm_area_struct;
166 * This much address space is reserved for vmalloc() and iomap()
167 * as well as fixmap mappings.
169 extern unsigned int __VMALLOC_RESERVE;
171 extern int sysctl_legacy_va_layout;
173 extern int devmem_is_allowed(unsigned long pagenr);
175 extern int page_is_ram(unsigned long pagenr);
177 #endif /* __ASSEMBLY__ */
180 #define __PAGE_OFFSET CONFIG_PAGE_OFFSET
181 #define __PHYSICAL_START CONFIG_PHYSICAL_START
183 #define __PAGE_OFFSET ((unsigned long)CONFIG_PAGE_OFFSET)
184 #define __PHYSICAL_START ((unsigned long)CONFIG_PHYSICAL_START)
186 #define __KERNEL_START (__PAGE_OFFSET + __PHYSICAL_START)
188 #ifdef CONFIG_XEN_COMPAT_030002
190 #define LOAD_OFFSET 0
191 #endif /* CONFIG_XEN_COMPAT_030002 */
193 #define PAGE_OFFSET ((unsigned long)__PAGE_OFFSET)
194 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
195 #define MAXMEM (__FIXADDR_TOP-__PAGE_OFFSET-__VMALLOC_RESERVE)
196 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
197 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
198 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
199 #ifdef CONFIG_FLATMEM
200 #define pfn_valid(pfn) ((pfn) < max_mapnr)
201 #endif /* CONFIG_FLATMEM */
202 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
204 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
206 #define VM_DATA_DEFAULT_FLAGS \
207 (VM_READ | VM_WRITE | \
208 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0 ) | \
209 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC)
211 /* VIRT <-> MACHINE conversion */
212 #define virt_to_machine(v) (phys_to_machine(__pa(v)))
213 #define virt_to_mfn(v) (pfn_to_mfn(__pa(v) >> PAGE_SHIFT))
214 #define mfn_to_virt(m) (__va(mfn_to_pfn(m) << PAGE_SHIFT))
216 #include <asm-generic/memory_model.h>
217 #include <asm-generic/page.h>
219 #define __HAVE_ARCH_GATE_AREA 1
220 #endif /* __KERNEL__ */
222 #endif /* _I386_PAGE_H */