42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
|
#ifndef _ASM_FIXMAP_H
|
||
|
|
#define _ASM_FIXMAP_H
|
||
|
|
|
||
|
|
/*
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#define FIXADDR_START 0xfff00000UL
|
||
|
|
#define FIXADDR_TOP 0xfffe0000UL
|
||
|
|
#define FIXADDR_SIZE (FIXADDR_TOP - FIXADDR_START)
|
||
|
|
|
||
|
|
#define FIX_KMAP_BEGIN 0
|
||
|
|
#define FIX_KMAP_END (FIXADDR_SIZE >> PAGE_SHIFT)
|
||
|
|
|
||
|
|
#define __fix_to_virt(x) (FIXADDR_START + ((x) << PAGE_SHIFT))
|
||
|
|
#define __virt_to_fix(x) (((x) - FIXADDR_START) >> PAGE_SHIFT)
|
||
|
|
|
||
|
|
extern void __this_fixmap_does_not_exist(void);
|
||
|
|
|
||
|
|
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);
|
||
|
|
}
|
||
|
|
|
||
|
|
static inline unsigned int virt_to_fix(const unsigned long vaddr)
|
||
|
|
{
|
||
|
|
BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
|
||
|
|
return __virt_to_fix(vaddr);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|