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198 lines
3.7 KiB
198 lines
3.7 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) |
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*/ |
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#ifndef _ASM_BITOPS_H |
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#define _ASM_BITOPS_H |
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#ifndef _LINUX_BITOPS_H |
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#error only <linux/bitops.h> can be included directly |
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#endif |
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#ifndef __ASSEMBLY__ |
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#include <linux/types.h> |
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#include <linux/compiler.h> |
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#ifdef CONFIG_ISA_ARCOMPACT |
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/* |
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* Count the number of zeros, starting from MSB |
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* Helper for fls( ) friends |
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* This is a pure count, so (1-32) or (0-31) doesn't apply |
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* It could be 0 to 32, based on num of 0's in there |
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* clz(0x8000_0000) = 0, clz(0xFFFF_FFFF)=0, clz(0) = 32, clz(1) = 31 |
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*/ |
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static inline __attribute__ ((const)) int clz(unsigned int x) |
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{ |
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unsigned int res; |
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__asm__ __volatile__( |
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" norm.f %0, %1 \n" |
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" mov.n %0, 0 \n" |
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" add.p %0, %0, 1 \n" |
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: "=r"(res) |
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: "r"(x) |
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: "cc"); |
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return res; |
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} |
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static inline int constant_fls(unsigned int x) |
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{ |
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int r = 32; |
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if (!x) |
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return 0; |
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if (!(x & 0xffff0000u)) { |
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x <<= 16; |
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r -= 16; |
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} |
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if (!(x & 0xff000000u)) { |
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x <<= 8; |
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r -= 8; |
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} |
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if (!(x & 0xf0000000u)) { |
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x <<= 4; |
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r -= 4; |
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} |
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if (!(x & 0xc0000000u)) { |
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x <<= 2; |
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r -= 2; |
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} |
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if (!(x & 0x80000000u)) |
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r -= 1; |
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return r; |
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} |
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/* |
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* fls = Find Last Set in word |
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* @result: [1-32] |
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* fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0 |
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*/ |
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static inline __attribute__ ((const)) int fls(unsigned int x) |
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{ |
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if (__builtin_constant_p(x)) |
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return constant_fls(x); |
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return 32 - clz(x); |
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} |
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/* |
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* __fls: Similar to fls, but zero based (0-31) |
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*/ |
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static inline __attribute__ ((const)) int __fls(unsigned long x) |
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{ |
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if (!x) |
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return 0; |
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else |
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return fls(x) - 1; |
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} |
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/* |
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* ffs = Find First Set in word (LSB to MSB) |
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* @result: [1-32], 0 if all 0's |
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*/ |
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#define ffs(x) ({ unsigned long __t = (x); fls(__t & -__t); }) |
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/* |
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* __ffs: Similar to ffs, but zero based (0-31) |
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*/ |
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static inline __attribute__ ((const)) unsigned long __ffs(unsigned long word) |
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{ |
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if (!word) |
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return word; |
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return ffs(word) - 1; |
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} |
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#else /* CONFIG_ISA_ARCV2 */ |
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/* |
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* fls = Find Last Set in word |
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* @result: [1-32] |
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* fls(1) = 1, fls(0x80000000) = 32, fls(0) = 0 |
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*/ |
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static inline __attribute__ ((const)) int fls(unsigned int x) |
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{ |
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int n; |
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asm volatile( |
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" fls.f %0, %1 \n" /* 0:31; 0(Z) if src 0 */ |
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" add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */ |
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: "=r"(n) /* Early clobber not needed */ |
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: "r"(x) |
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: "cc"); |
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return n; |
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} |
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/* |
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* __fls: Similar to fls, but zero based (0-31). Also 0 if no bit set |
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*/ |
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static inline __attribute__ ((const)) int __fls(unsigned long x) |
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{ |
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/* FLS insn has exactly same semantics as the API */ |
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return __builtin_arc_fls(x); |
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} |
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/* |
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* ffs = Find First Set in word (LSB to MSB) |
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* @result: [1-32], 0 if all 0's |
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*/ |
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static inline __attribute__ ((const)) int ffs(unsigned int x) |
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{ |
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int n; |
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asm volatile( |
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" ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */ |
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" add.nz %0, %0, 1 \n" /* 0:31 -> 1:32 */ |
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" mov.z %0, 0 \n" /* 31(Z)-> 0 */ |
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: "=r"(n) /* Early clobber not needed */ |
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: "r"(x) |
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: "cc"); |
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return n; |
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} |
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/* |
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* __ffs: Similar to ffs, but zero based (0-31) |
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*/ |
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static inline __attribute__ ((const)) unsigned long __ffs(unsigned long x) |
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{ |
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unsigned long n; |
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asm volatile( |
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" ffs.f %0, %1 \n" /* 0:31; 31(Z) if src 0 */ |
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" mov.z %0, 0 \n" /* 31(Z)-> 0 */ |
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: "=r"(n) |
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: "r"(x) |
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: "cc"); |
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return n; |
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} |
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#endif /* CONFIG_ISA_ARCOMPACT */ |
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/* |
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* ffz = Find First Zero in word. |
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* @return:[0-31], 32 if all 1's |
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*/ |
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#define ffz(x) __ffs(~(x)) |
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#include <asm-generic/bitops/hweight.h> |
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#include <asm-generic/bitops/fls64.h> |
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#include <asm-generic/bitops/sched.h> |
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#include <asm-generic/bitops/lock.h> |
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#include <asm-generic/bitops/atomic.h> |
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#include <asm-generic/bitops/non-atomic.h> |
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#include <asm-generic/bitops/find.h> |
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#include <asm-generic/bitops/le.h> |
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#include <asm-generic/bitops/ext2-atomic-setbit.h> |
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#endif /* !__ASSEMBLY__ */ |
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#endif
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