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51533b61 MS |
1 | #ifndef _ASM_CRIS_ARCH_BITOPS_H |
2 | #define _ASM_CRIS_ARCH_BITOPS_H | |
3 | ||
4 | /* | |
5 | * Helper functions for the core of the ff[sz] functions. They compute the | |
6 | * number of leading zeroes of a bits-in-byte, byte-in-word and | |
7 | * word-in-dword-swapped number. They differ in that the first function also | |
8 | * inverts all bits in the input. | |
9 | */ | |
10 | ||
d9b5444e | 11 | static inline unsigned long |
51533b61 MS |
12 | cris_swapnwbrlz(unsigned long w) |
13 | { | |
14 | unsigned long res; | |
15 | ||
16 | __asm__ __volatile__ ("swapnwbr %0\n\t" | |
17 | "lz %0,%0" | |
18 | : "=r" (res) : "0" (w)); | |
19 | ||
20 | return res; | |
21 | } | |
22 | ||
d9b5444e | 23 | static inline unsigned long |
51533b61 MS |
24 | cris_swapwbrlz(unsigned long w) |
25 | { | |
26 | unsigned long res; | |
27 | ||
28 | __asm__ __volatile__ ("swapwbr %0\n\t" | |
29 | "lz %0,%0" | |
30 | : "=r" (res) : "0" (w)); | |
31 | ||
32 | return res; | |
33 | } | |
34 | ||
35 | /* | |
36 | * Find First Zero in word. Undefined if no zero exist, so the caller should | |
37 | * check against ~0 first. | |
38 | */ | |
d9b5444e | 39 | static inline unsigned long |
51533b61 MS |
40 | ffz(unsigned long w) |
41 | { | |
42 | return cris_swapnwbrlz(w); | |
43 | } | |
44 | ||
45 | /* | |
46 | * Find First Set bit in word. Undefined if no 1 exist, so the caller | |
47 | * should check against 0 first. | |
48 | */ | |
d9b5444e | 49 | static inline unsigned long |
51533b61 MS |
50 | __ffs(unsigned long w) |
51 | { | |
52 | return cris_swapnwbrlz(~w); | |
53 | } | |
54 | ||
55 | /* | |
56 | * Find First Bit that is set. | |
57 | */ | |
d9b5444e | 58 | static inline unsigned long |
51533b61 MS |
59 | kernel_ffs(unsigned long w) |
60 | { | |
61 | return w ? cris_swapwbrlz (w) + 1 : 0; | |
62 | } | |
63 | ||
64 | #endif /* _ASM_CRIS_ARCH_BITOPS_H */ |