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1965aae3 PA |
1 | #ifndef _ASM_X86_FIXMAP_H |
2 | #define _ASM_X86_FIXMAP_H | |
3ec96783 | 3 | |
96a388de TG |
4 | #ifdef CONFIG_X86_32 |
5 | # include "fixmap_32.h" | |
6 | #else | |
7 | # include "fixmap_64.h" | |
8 | #endif | |
3ec96783 | 9 | |
7c7e6e07 JF |
10 | extern int fixmaps_set; |
11 | ||
fd940934 KP |
12 | extern pte_t *kmap_pte; |
13 | extern pgprot_t kmap_prot; | |
14 | extern pte_t *pkmap_page_table; | |
15 | ||
aeaaa59c JF |
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); | |
19 | ||
20 | #ifndef CONFIG_PARAVIRT | |
21 | static inline void __set_fixmap(enum fixed_addresses idx, | |
22 | unsigned long phys, pgprot_t flags) | |
23 | { | |
24 | native_set_fixmap(idx, phys, flags); | |
25 | } | |
26 | #endif | |
27 | ||
944256e0 JF |
28 | #define set_fixmap(idx, phys) \ |
29 | __set_fixmap(idx, phys, PAGE_KERNEL) | |
30 | ||
31 | /* | |
32 | * Some hardware wants to get fixmapped without caching. | |
33 | */ | |
34 | #define set_fixmap_nocache(idx, phys) \ | |
35 | __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE) | |
36 | ||
3ec96783 IM |
37 | #define clear_fixmap(idx) \ |
38 | __set_fixmap(idx, 0, __pgprot(0)) | |
39 | ||
944256e0 JF |
40 | #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT)) |
41 | #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT) | |
42 | ||
43 | extern void __this_fixmap_does_not_exist(void); | |
44 | ||
45 | /* | |
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. | |
49 | */ | |
50 | static __always_inline unsigned long fix_to_virt(const unsigned int idx) | |
51 | { | |
52 | /* | |
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). | |
57 | * | |
58 | * If it doesn't get removed, the linker will complain | |
59 | * loudly with a reasonably clear error message.. | |
60 | */ | |
61 | if (idx >= __end_of_fixed_addresses) | |
62 | __this_fixmap_does_not_exist(); | |
63 | ||
64 | return __fix_to_virt(idx); | |
65 | } | |
66 | ||
67 | static inline unsigned long virt_to_fix(const unsigned long vaddr) | |
68 | { | |
69 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | |
70 | return __virt_to_fix(vaddr); | |
71 | } | |
1965aae3 | 72 | #endif /* _ASM_X86_FIXMAP_H */ |