5 # include "fixmap_32.h"
7 # include "fixmap_64.h"
10 extern int fixmaps_set;
12 extern void __set_fixmap(enum fixed_addresses idx,
13 unsigned long phys, pgprot_t flags);
14 #define set_fixmap(idx, phys) \
15 __set_fixmap(idx, phys, PAGE_KERNEL)
18 * Some hardware wants to get fixmapped without caching.
20 #define set_fixmap_nocache(idx, phys) \
21 __set_fixmap(idx, phys, PAGE_KERNEL_NOCACHE)
23 #define clear_fixmap(idx) \
24 __set_fixmap(idx, 0, __pgprot(0))
26 #define __fix_to_virt(x) (FIXADDR_TOP - ((x) << PAGE_SHIFT))
27 #define __virt_to_fix(x) ((FIXADDR_TOP - ((x)&PAGE_MASK)) >> PAGE_SHIFT)
29 extern void __this_fixmap_does_not_exist(void);
32 * 'index to address' translation. If anyone tries to use the idx
33 * directly without translation, we catch the bug with a NULL-deference
34 * kernel oops. Illegal ranges of incoming indices are caught too.
36 static __always_inline unsigned long fix_to_virt(const unsigned int idx)
39 * this branch gets completely eliminated after inlining,
40 * except when someone tries to use fixaddr indices in an
41 * illegal way. (such as mixing up address types or using
42 * out-of-range indices).
44 * If it doesn't get removed, the linker will complain
45 * loudly with a reasonably clear error message..
47 if (idx >= __end_of_fixed_addresses)
48 __this_fixmap_does_not_exist();
50 return __fix_to_virt(idx);
53 static inline unsigned long virt_to_fix(const unsigned long vaddr)
55 BUG_ON(vaddr >= FIXADDR_TOP || vaddr < FIXADDR_START);
56 return __virt_to_fix(vaddr);