include/asm/bitops.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002
0003 #ifndef __ASM_CSKY_BITOPS_H
0004 #define __ASM_CSKY_BITOPS_H
0005
0006 #include <linux/compiler.h>
0007 #include <asm/barrier.h>
0008
0009 /*
0010  * asm-generic/bitops/ffs.h
0011  */
0012 static inline int ffs(int x)
0013 {
0014     if (!x)
0015         return 0;
0016
0017     asm volatile (
0018         "brev %0\n"
0019         "ff1  %0\n"
0020         "addi %0, 1\n"
0021         : "=&r"(x)
0022         : "0"(x));
0023     return x;
0024 }
0025
0026 /*
0027  * asm-generic/bitops/__ffs.h
0028  */
0029 static __always_inline unsigned long __ffs(unsigned long x)
0030 {
0031     asm volatile (
0032         "brev %0\n"
0033         "ff1  %0\n"
0034         : "=&r"(x)
0035         : "0"(x));
0036     return x;
0037 }
0038
0039 /*
0040  * asm-generic/bitops/fls.h
0041  */
0042 static __always_inline int fls(unsigned int x)
0043 {
0044     asm volatile(
0045         "ff1 %0\n"
0046         : "=&r"(x)
0047         : "0"(x));
0048
0049     return (32 - x);
0050 }
0051
0052 /*
0053  * asm-generic/bitops/__fls.h
0054  */
0055 static __always_inline unsigned long __fls(unsigned long x)
0056 {
0057     return fls(x) - 1;
0058 }
0059
0060 #include <asm-generic/bitops/ffz.h>
0061 #include <asm-generic/bitops/fls64.h>
0062
0063 #ifndef _LINUX_BITOPS_H
0064 #error only <linux/bitops.h> can be included directly
0065 #endif
0066
0067 #include <asm-generic/bitops/sched.h>
0068 #include <asm-generic/bitops/hweight.h>
0069 #include <asm-generic/bitops/lock.h>
0070 #include <asm-generic/bitops/atomic.h>
0071
0072 /*
0073  * bug fix, why only could use atomic!!!!
0074  */
0075 #include <asm-generic/bitops/non-atomic.h>
0076
0077 #include <asm-generic/bitops/le.h>
0078 #include <asm-generic/bitops/ext2-atomic.h>
0079 #endif /* __ASM_CSKY_BITOPS_H */