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