Commit | Line | Data |
---|---|---|
5f0fbf9e NP |
1 | #ifndef _ASM_FIXMAP_H |
2 | #define _ASM_FIXMAP_H | |
3 | ||
4 | /* | |
5 | * Nothing too fancy for now. | |
6 | * | |
7 | * On ARM we already have well known fixed virtual addresses imposed by | |
8 | * the architecture such as the vector page which is located at 0xffff0000, | |
9 | * therefore a second level page table is already allocated covering | |
10 | * 0xfff00000 upwards. | |
11 | * | |
12 | * The cache flushing code in proc-xscale.S uses the virtual area between | |
13 | * 0xfffe0000 and 0xfffeffff. | |
14 | */ | |
15 | ||
16 | #define FIXADDR_START 0xfff00000UL | |
17 | #define FIXADDR_TOP 0xfffe0000UL | |
18 | #define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START) | |
19 | ||
20 | #define FIX_KMAP_BEGIN 0 | |
21 | #define FIX_KMAP_END (FIXADDR_SIZE >> PAGE_SHIFT) | |
22 | ||
23 | #define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT)) | |
24 | #define __virt_to_fix(x) (((x) - FIXADDR_START) >> PAGE_SHIFT) | |
25 | ||
26 | extern void __this_fixmap_does_not_exist(void); | |
27 | ||
28 | static inline unsigned long fix_to_virt(const unsigned int idx) | |
29 | { | |
30 | if (idx >= FIX_KMAP_END) | |
31 | __this_fixmap_does_not_exist(); | |
32 | return __fix_to_virt(idx); | |
33 | } | |
34 | ||
35 | static inline unsigned int virt_to_fix(const unsigned long vaddr) | |
36 | { | |
37 | BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | |
38 | return __virt_to_fix(vaddr); | |
39 | } | |
40 | ||
41 | #endif |