diff options
Diffstat (limited to 'include/asm-generic')
-rw-r--r-- | include/asm-generic/bitops.h | 76 |
1 files changed, 13 insertions, 63 deletions
diff --git a/include/asm-generic/bitops.h b/include/asm-generic/bitops.h index 0e6d9852008c..1f9d99193df8 100644 --- a/include/asm-generic/bitops.h +++ b/include/asm-generic/bitops.h | |||
@@ -5,77 +5,27 @@ | |||
5 | * For the benefit of those who are trying to port Linux to another | 5 | * For the benefit of those who are trying to port Linux to another |
6 | * architecture, here are some C-language equivalents. You should | 6 | * architecture, here are some C-language equivalents. You should |
7 | * recode these in the native assembly language, if at all possible. | 7 | * recode these in the native assembly language, if at all possible. |
8 | * To guarantee atomicity, these routines call cli() and sti() to | ||
9 | * disable interrupts while they operate. (You have to provide inline | ||
10 | * routines to cli() and sti().) | ||
11 | * | ||
12 | * Also note, these routines assume that you have 32 bit longs. | ||
13 | * You will have to change this if you are trying to port Linux to the | ||
14 | * Alpha architecture or to a Cray. :-) | ||
15 | * | 8 | * |
16 | * C language equivalents written by Theodore Ts'o, 9/26/92 | 9 | * C language equivalents written by Theodore Ts'o, 9/26/92 |
17 | */ | 10 | */ |
18 | 11 | ||
19 | extern __inline__ int set_bit(int nr,long * addr) | 12 | #include <asm-generic/bitops/atomic.h> |
20 | { | 13 | #include <asm-generic/bitops/non-atomic.h> |
21 | int mask, retval; | 14 | #include <asm-generic/bitops/__ffs.h> |
22 | 15 | #include <asm-generic/bitops/ffz.h> | |
23 | addr += nr >> 5; | 16 | #include <asm-generic/bitops/fls.h> |
24 | mask = 1 << (nr & 0x1f); | 17 | #include <asm-generic/bitops/fls64.h> |
25 | cli(); | 18 | #include <asm-generic/bitops/find.h> |
26 | retval = (mask & *addr) != 0; | ||
27 | *addr |= mask; | ||
28 | sti(); | ||
29 | return retval; | ||
30 | } | ||
31 | |||
32 | extern __inline__ int clear_bit(int nr, long * addr) | ||
33 | { | ||
34 | int mask, retval; | ||
35 | |||
36 | addr += nr >> 5; | ||
37 | mask = 1 << (nr & 0x1f); | ||
38 | cli(); | ||
39 | retval = (mask & *addr) != 0; | ||
40 | *addr &= ~mask; | ||
41 | sti(); | ||
42 | return retval; | ||
43 | } | ||
44 | |||
45 | extern __inline__ int test_bit(int nr, const unsigned long * addr) | ||
46 | { | ||
47 | int mask; | ||
48 | |||
49 | addr += nr >> 5; | ||
50 | mask = 1 << (nr & 0x1f); | ||
51 | return ((mask & *addr) != 0); | ||
52 | } | ||
53 | |||
54 | /* | ||
55 | * fls: find last bit set. | ||
56 | */ | ||
57 | |||
58 | #define fls(x) generic_fls(x) | ||
59 | #define fls64(x) generic_fls64(x) | ||
60 | 19 | ||
61 | #ifdef __KERNEL__ | 20 | #ifdef __KERNEL__ |
62 | 21 | ||
63 | /* | 22 | #include <asm-generic/bitops/sched.h> |
64 | * ffs: find first bit set. This is defined the same way as | 23 | #include <asm-generic/bitops/ffs.h> |
65 | * the libc and compiler builtin ffs routines, therefore | 24 | #include <asm-generic/bitops/hweight.h> |
66 | * differs in spirit from the above ffz (man ffs). | ||
67 | */ | ||
68 | |||
69 | #define ffs(x) generic_ffs(x) | ||
70 | |||
71 | /* | ||
72 | * hweightN: returns the hamming weight (i.e. the number | ||
73 | * of bits set) of a N-bit word | ||
74 | */ | ||
75 | 25 | ||
76 | #define hweight32(x) generic_hweight32(x) | 26 | #include <asm-generic/bitops/ext2-non-atomic.h> |
77 | #define hweight16(x) generic_hweight16(x) | 27 | #include <asm-generic/bitops/ext2-atomic.h> |
78 | #define hweight8(x) generic_hweight8(x) | 28 | #include <asm-generic/bitops/minix.h> |
79 | 29 | ||
80 | #endif /* __KERNEL__ */ | 30 | #endif /* __KERNEL__ */ |
81 | 31 | ||