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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,41 @@ | ||
#ifndef _ASM_FIXMAP_H | ||
#define _ASM_FIXMAP_H | ||
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/* | ||
* Nothing too fancy for now. | ||
* | ||
* On ARM we already have well known fixed virtual addresses imposed by | ||
* the architecture such as the vector page which is located at 0xffff0000, | ||
* therefore a second level page table is already allocated covering | ||
* 0xfff00000 upwards. | ||
* | ||
* The cache flushing code in proc-xscale.S uses the virtual area between | ||
* 0xfffe0000 and 0xfffeffff. | ||
*/ | ||
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#define FIXADDR_START 0xfff00000UL | ||
#define FIXADDR_TOP 0xfffe0000UL | ||
#define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START) | ||
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#define FIX_KMAP_BEGIN 0 | ||
#define FIX_KMAP_END (FIXADDR_SIZE >> PAGE_SHIFT) | ||
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#define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT)) | ||
#define __virt_to_fix(x) (((x) - FIXADDR_START) >> PAGE_SHIFT) | ||
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extern void __this_fixmap_does_not_exist(void); | ||
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static inline unsigned long fix_to_virt(const unsigned int idx) | ||
{ | ||
if (idx >= FIX_KMAP_END) | ||
__this_fixmap_does_not_exist(); | ||
return __fix_to_virt(idx); | ||
} | ||
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static inline unsigned int virt_to_fix(const unsigned long vaddr) | ||
{ | ||
BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START); | ||
return __virt_to_fix(vaddr); | ||
} | ||
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||
#endif |
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