Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 | /* SPDX-License-Identifier: GPL-2.0-only */ /* * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) */ #ifndef _ASM_BITOPS_H #define _ASM_BITOPS_H #ifndef _LINUX_BITOPS_H #error only <linux/bitops.h> can be included directly #endif #ifndef __ASSEMBLY__ #include <linux/types.h> #include <linux/compiler.h> #ifdef CONFIG_ISA_ARCOMPACT /* * Count the number of zeros, starting from MSB * Helper for fls( ) friends * This is a pure count, so (1-32) or (0-31) doesn't apply * It could be 0 to 32, based on num of 0's in there * clz(0x8000_0000) = 0, clz(0xFFFF_FFFF)=0, clz(0) = 32, clz(1) = 31 */ static inline __attribute__ ((const)) int clz(unsigned int x) { unsigned int res; __asm__ __volatile__( " norm.f %0, %1 \n" " mov.n %0, 0 \n" " add.p %0, %0, 1 \n" : "=r"(res) : "r"(x) : "cc"); return res; } static inline int constant_fls(unsigned int x) { int r = 32; if (!x) return 0; if (!(x & 0xffff0000u)) { x <<= 16; r -= 16; } if (!(x & 0xff000000u)) { x <<= 8; r -= 8; } if (!(x & 0xf0000000u)) { x <<= 4; r -= 4; } if (!(x & 0xc0000000u)) { x <<= 2; r -= 2; } if (!(x & 0x80000000u)) r -= 1; return r; } /* * fls = Find Last Set in word * @result: [1-32] * fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0 */ static inline __attribute__ ((const)) int fls(unsigned int x) { if (__builtin_constant_p(x)) return constant_fls(x); return 32 - clz(x); } /* * __fls: Similar to fls, but zero based (0-31) */ static inline __attribute__ ((const)) unsigned long __fls(unsigned long x) { if (!x) return 0; else return fls(x) - 1; } /* * ffs = Find First Set in word (LSB to MSB) * @result: [1-32], 0 if all 0's */ #define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); }) /* * __ffs: Similar to ffs, but zero based (0-31) */ static inline __attribute__ ((const)) unsigned long __ffs(unsigned long word) { if (!word) return word; return ffs(word) - 1; } #else /* CONFIG_ISA_ARCV2 */ /* * fls = Find Last Set in word * @result: [1-32] * fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0 */ static inline __attribute__ ((const)) int fls(unsigned int x) { int n; asm volatile( " fls.f %0, %1 \n" /* 0:31; 0(Z) if src 0 */ " add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */ : "=r"(n) /* Early clobber not needed */ : "r"(x) : "cc"); return n; } /* * __fls: Similar to fls, but zero based (0-31). Also 0 if no bit set */ static inline __attribute__ ((const)) unsigned long __fls(unsigned long x) { /* FLS insn has exactly same semantics as the API */ return __builtin_arc_fls(x); } /* * ffs = Find First Set in word (LSB to MSB) * @result: [1-32], 0 if all 0's */ static inline __attribute__ ((const)) int ffs(unsigned int x) { int n; asm volatile( " ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */ " add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */ " mov.z %0, 0 \n" /* 31(Z)-> 0 */ : "=r"(n) /* Early clobber not needed */ : "r"(x) : "cc"); return n; } /* * __ffs: Similar to ffs, but zero based (0-31) */ static inline __attribute__ ((const)) unsigned long __ffs(unsigned long x) { unsigned long n; asm volatile( " ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */ " mov.z %0, 0 \n" /* 31(Z)-> 0 */ : "=r"(n) : "r"(x) : "cc"); return n; } #endif /* CONFIG_ISA_ARCOMPACT */ /* * ffz = Find First Zero in word. * @return:[0-31], 32 if all 1's */ #define ffz(x) __ffs(~(x)) #include <asm-generic/bitops/hweight.h> #include <asm-generic/bitops/fls64.h> #include <asm-generic/bitops/sched.h> #include <asm-generic/bitops/lock.h> #include <asm-generic/bitops/atomic.h> #include <asm-generic/bitops/non-atomic.h> #include <asm-generic/bitops/le.h> #include <asm-generic/bitops/ext2-atomic-setbit.h> #endif /* !__ASSEMBLY__ */ #endif |