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-rw-r--r--include/asm-generic/bitops.h76
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
19extern __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
32extern __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
45extern __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