1/*
2 *  Port on Texas Instruments TMS320C6x architecture
3 *
4 *  Copyright (C) 2004, 2009, 2010 Texas Instruments Incorporated
5 *  Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com)
6 *
7 *  This program is free software; you can redistribute it and/or modify
8 *  it under the terms of the GNU General Public License version 2 as
9 *  published by the Free Software Foundation.
10 */
11#ifndef _ASM_C6X_BITOPS_H
12#define _ASM_C6X_BITOPS_H
13
14#ifdef __KERNEL__
15
16#include <linux/bitops.h>
17
18#include <asm/byteorder.h>
19
20/*
21 * clear_bit() doesn't provide any barrier for the compiler.
22 */
23#define smp_mb__before_clear_bit() barrier()
24#define smp_mb__after_clear_bit()  barrier()
25
26/*
27 * We are lucky, DSP is perfect for bitops: do it in 3 cycles
28 */
29
30/**
31 * __ffs - find first bit in word.
32 * @word: The word to search
33 *
34 * Undefined if no bit exists, so code should check against 0 first.
35 * Note __ffs(0) = undef, __ffs(1) = 0, __ffs(0x80000000) = 31.
36 *
37 */
38static inline unsigned long __ffs(unsigned long x)
39{
40	asm (" bitr  .M1  %0,%0\n"
41	     " nop\n"
42	     " lmbd  .L1  1,%0,%0\n"
43	     : "+a"(x));
44
45	return x;
46}
47
48/*
49 * ffz - find first zero in word.
50 * @word: The word to search
51 *
52 * Undefined if no zero exists, so code should check against ~0UL first.
53 */
54#define ffz(x) __ffs(~(x))
55
56/**
57 * fls - find last (most-significant) bit set
58 * @x: the word to search
59 *
60 * This is defined the same way as ffs.
61 * Note fls(0) = 0, fls(1) = 1, fls(0x80000000) = 32.
62 */
63static inline int fls(int x)
64{
65	if (!x)
66		return 0;
67
68	asm (" lmbd  .L1  1,%0,%0\n" : "+a"(x));
69
70	return 32 - x;
71}
72
73/**
74 * ffs - find first bit set
75 * @x: the word to search
76 *
77 * This is defined the same way as
78 * the libc and compiler builtin ffs routines, therefore
79 * differs in spirit from the above ffz (man ffs).
80 * Note ffs(0) = 0, ffs(1) = 1, ffs(0x80000000) = 32.
81 */
82static inline int ffs(int x)
83{
84	if (!x)
85		return 0;
86
87	return __ffs(x) + 1;
88}
89
90#include <asm-generic/bitops/__fls.h>
91#include <asm-generic/bitops/fls64.h>
92#include <asm-generic/bitops/find.h>
93
94#include <asm-generic/bitops/sched.h>
95#include <asm-generic/bitops/hweight.h>
96#include <asm-generic/bitops/lock.h>
97
98#include <asm-generic/bitops/atomic.h>
99#include <asm-generic/bitops/non-atomic.h>
100#include <asm-generic/bitops/le.h>
101#include <asm-generic/bitops/ext2-atomic.h>
102
103#endif /* __KERNEL__ */
104#endif /* _ASM_C6X_BITOPS_H */
105