1 #ifndef _ASM_X86_FIXMAP_H
2 #define _ASM_X86_FIXMAP_H
5 # include "fixmap_32.h"
7 # include "fixmap_64.h"
10 extern int fixmaps_set
;
12 extern pte_t
*kmap_pte
;
13 extern pgprot_t kmap_prot
;
14 extern pte_t
*pkmap_page_table
;
16 void __native_set_fixmap(enum fixed_addresses idx
, pte_t pte
);
17 void native_set_fixmap(enum fixed_addresses idx
,
18 unsigned long phys
, pgprot_t flags
);
20 #ifndef CONFIG_PARAVIRT
21 static inline void __set_fixmap(enum fixed_addresses idx
,
22 unsigned long phys
, pgprot_t flags
)
24 native_set_fixmap(idx
, phys
, flags
);
28 #define set_fixmap(idx, phys) \
29 __set_fixmap(idx, phys, PAGE_KERNEL)
32 * Some hardware wants to get fixmapped without caching.
34 #define set_fixmap_nocache(idx, phys) \
35 __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
37 #define clear_fixmap(idx) \
38 __set_fixmap(idx, 0, __pgprot(0))
40 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
41 #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
43 extern void __this_fixmap_does_not_exist(void);
46 * 'index to address' translation. If anyone tries to use the idx
47 * directly without translation, we catch the bug with a NULL-deference
48 * kernel oops. Illegal ranges of incoming indices are caught too.
50 static __always_inline
unsigned long fix_to_virt(const unsigned int idx
)
53 * this branch gets completely eliminated after inlining,
54 * except when someone tries to use fixaddr indices in an
55 * illegal way. (such as mixing up address types or using
56 * out-of-range indices).
58 * If it doesn't get removed, the linker will complain
59 * loudly with a reasonably clear error message..
61 if (idx
>= __end_of_fixed_addresses
)
62 __this_fixmap_does_not_exist();
64 return __fix_to_virt(idx
);
67 static inline unsigned long virt_to_fix(const unsigned long vaddr
)
69 BUG_ON(vaddr
>= FIXADDR_TOP
|| vaddr
< FIXADDR_START
);
70 return __virt_to_fix(vaddr
);
72 #endif /* _ASM_X86_FIXMAP_H */
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