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H. Peter Anvin1965aae2008-10-22 22:26:29 -07001#ifndef _ASM_X86_FIXMAP_H
2#define _ASM_X86_FIXMAP_H
Ingo Molnar3ec96782008-04-25 18:25:25 +02003
Thomas Gleixner96a388d2007-10-11 11:20:03 +02004#ifdef CONFIG_X86_32
5# include "fixmap_32.h"
6#else
7# include "fixmap_64.h"
8#endif
Ingo Molnar3ec96782008-04-25 18:25:25 +02009
Jeremy Fitzhardinge7c7e6e02008-06-17 11:41:54 -070010extern int fixmaps_set;
11
Keith Packardfd940932008-10-30 19:37:09 -070012extern pte_t *kmap_pte;
13extern pgprot_t kmap_prot;
14extern pte_t *pkmap_page_table;
15
Jeremy Fitzhardingeaeaaa592008-06-17 11:42:01 -070016void __native_set_fixmap(enum fixed_addresses idx, pte_t pte);
17void native_set_fixmap(enum fixed_addresses idx,
18 unsigned long phys, pgprot_t flags);
19
20#ifndef CONFIG_PARAVIRT
21static 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
Jeremy Fitzhardinge944256e2008-06-17 11:41:49 -070028#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
Ingo Molnar3ec96782008-04-25 18:25:25 +020037#define clear_fixmap(idx) \
38 __set_fixmap(idx, 0, __pgprot(0))
39
Jeremy Fitzhardinge944256e2008-06-17 11:41:49 -070040#define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
41#define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
42
43extern 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 */
50static __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
67static 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}
H. Peter Anvin1965aae2008-10-22 22:26:29 -070072#endif /* _ASM_X86_FIXMAP_H */