1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Port on Texas Instruments TMS320C6x architecture
4 *
5 * Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
6 * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
7 */
8 #ifndef _ASM_C6X_BITOPS_H
9 #define _ASM_C6X_BITOPS_H
10
11 #ifdef __KERNEL__
12
13 #include <linux/bitops.h>
14 #include <asm/byteorder.h>
15 #include <asm/barrier.h>
16
17 /*
18 * We are lucky, DSP is perfect for bitops: do it in 3 cycles
19 */
20
21 /**
22 * __ffs - find first bit in word.
23 * @word: The word to search
24 *
25 * Undefined if no bit exists, so code should check against 0 first.
26 * Note __ffs(0) = undef, __ffs(1) = 0, __ffs(0x80000000) = 31.
27 *
28 */
__ffs(unsigned long x)29 static inline unsigned long __ffs(unsigned long x)
30 {
31 asm (" bitr .M1 %0,%0\n"
32 " nop\n"
33 " lmbd .L1 1,%0,%0\n"
34 : "+a"(x));
35
36 return x;
37 }
38
39 /*
40 * ffz - find first zero in word.
41 * @word: The word to search
42 *
43 * Undefined if no zero exists, so code should check against ~0UL first.
44 */
45 #define ffz(x) __ffs(~(x))
46
47 /**
48 * fls - find last (most-significant) bit set
49 * @x: the word to search
50 *
51 * This is defined the same way as ffs.
52 * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
53 */
fls(unsigned int x)54 static inline int fls(unsigned int x)
55 {
56 if (!x)
57 return 0;
58
59 asm (" lmbd .L1 1,%0,%0\n" : "+a"(x));
60
61 return 32 - x;
62 }
63
64 /**
65 * ffs - find first bit set
66 * @x: the word to search
67 *
68 * This is defined the same way as
69 * the libc and compiler builtin ffs routines, therefore
70 * differs in spirit from the above ffz (man ffs).
71 * Note ffs(0) = 0, ffs(1) = 1, ffs(0x80000000) = 32.
72 */
ffs(int x)73 static inline int ffs(int x)
74 {
75 if (!x)
76 return 0;
77
78 return __ffs(x) + 1;
79 }
80
81 #include <asm-generic/bitops/__fls.h>
82 #include <asm-generic/bitops/fls64.h>
83 #include <asm-generic/bitops/find.h>
84
85 #include <asm-generic/bitops/sched.h>
86 #include <asm-generic/bitops/hweight.h>
87 #include <asm-generic/bitops/lock.h>
88
89 #include <asm-generic/bitops/atomic.h>
90 #include <asm-generic/bitops/non-atomic.h>
91 #include <asm-generic/bitops/le.h>
92 #include <asm-generic/bitops/ext2-atomic.h>
93
94 #endif /* __KERNEL__ */
95 #endif /* _ASM_C6X_BITOPS_H */
96
