aeaaa59c7e
Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com> Signed-off-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Mark McLoughlin <markmc@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
#ifndef _ASM_FIXMAP_H
|
|
#define _ASM_FIXMAP_H
|
|
|
|
#ifdef CONFIG_X86_32
|
|
# include "fixmap_32.h"
|
|
#else
|
|
# include "fixmap_64.h"
|
|
#endif
|
|
|
|
extern int fixmaps_set;
|
|
|
|
void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
|
|
void native_set_fixmap(enum fixed_addresses idx,
|
|
unsigned long phys, pgprot_t flags);
|
|
|
|
#ifndef CONFIG_PARAVIRT
|
|
static inline void __set_fixmap(enum fixed_addresses idx,
|
|
unsigned long phys, pgprot_t flags)
|
|
{
|
|
native_set_fixmap(idx, phys, flags);
|
|
}
|
|
#endif
|
|
|
|
#define set_fixmap(idx, phys) \
|
|
__set_fixmap(idx, phys, PAGE_KERNEL)
|
|
|
|
/*
|
|
* Some hardware wants to get fixmapped without caching.
|
|
*/
|
|
#define set_fixmap_nocache(idx, phys) \
|
|
__set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
|
|
|
|
#define clear_fixmap(idx) \
|
|
__set_fixmap(idx, 0, __pgprot(0))
|
|
|
|
#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
|
|
#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
|
|
|
|
extern void __this_fixmap_does_not_exist(void);
|
|
|
|
/*
|
|
* 'index to address' translation. If anyone tries to use the idx
|
|
* directly without translation, we catch the bug with a NULL-deference
|
|
* kernel oops. Illegal ranges of incoming indices are caught too.
|
|
*/
|
|
static __always_inline unsigned long fix_to_virt(const unsigned int idx)
|
|
{
|
|
/*
|
|
* this branch gets completely eliminated after inlining,
|
|
* except when someone tries to use fixaddr indices in an
|
|
* illegal way. (such as mixing up address types or using
|
|
* out-of-range indices).
|
|
*
|
|
* If it doesn't get removed, the linker will complain
|
|
* loudly with a reasonably clear error message..
|
|
*/
|
|
if (idx >= __end_of_fixed_addresses)
|
|
__this_fixmap_does_not_exist();
|
|
|
|
return __fix_to_virt(idx);
|
|
}
|
|
|
|
static inline unsigned long virt_to_fix(const unsigned long vaddr)
|
|
{
|
|
BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
|
|
return __virt_to_fix(vaddr);
|
|
}
|
|
#endif
|