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 /* 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 can be included directly #endif #ifndef __ASSEMBLY__ #include #include #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)) int __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)) int __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 #include #include #include #include #include #include #include #include #endif /* !__ASSEMBLY__ */ #endif