8 * These are used to make use of C type-checking..
10 extern int nx_enabled
;
12 #endif /* !__ASSEMBLY__ */
16 struct vm_area_struct
;
19 * This much address space is reserved for vmalloc() and iomap()
20 * as well as fixmap mappings.
22 extern unsigned int __VMALLOC_RESERVE
;
24 extern int sysctl_legacy_va_layout
;
26 extern int page_is_ram(unsigned long pagenr
);
28 #endif /* __ASSEMBLY__ */
30 #define VMALLOC_RESERVE ((unsigned long)__VMALLOC_RESERVE)
31 #define MAXMEM (-__PAGE_OFFSET-__VMALLOC_RESERVE)
32 #define __pa(x) ((unsigned long)(x)-PAGE_OFFSET)
33 /* __pa_symbol should be used for C visible symbols.
34 This seems to be the official gcc blessed way to do such arithmetic. */
35 #define __pa_symbol(x) __pa(RELOC_HIDE((unsigned long)(x),0))
36 #define __va(x) ((void *)((unsigned long)(x)+PAGE_OFFSET))
37 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
39 #define pfn_valid(pfn) ((pfn) < max_mapnr)
40 #endif /* CONFIG_FLATMEM */
41 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
43 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
45 #include <asm-generic/memory_model.h>
46 #include <asm-generic/page.h>
48 #define __HAVE_ARCH_GATE_AREA 1
49 #endif /* __KERNEL__ */
51 #endif /* _I386_PAGE_H */