52 lines
1.0 KiB
C
52 lines
1.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_BITREV_H
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#define __ASM_BITREV_H
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#include <linux/types.h>
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#include <asm/cpufeature-macros.h>
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#include <asm/hwcap.h>
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#include <asm-generic/bitops/__bitrev.h>
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static __always_inline __attribute_const__ u32 __arch_bitrev32(u32 x)
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{
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unsigned long result;
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if (!riscv_has_extension_likely(RISCV_ISA_EXT_ZBKB))
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return generic___bitrev32(x);
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asm volatile(
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".option push\n"
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".option arch,+zbkb\n"
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"rev8 %0, %1\n"
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"brev8 %0, %0\n"
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".option pop"
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: "=r" (result) : "r" ((long)x)
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);
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return result >> (__riscv_xlen - 32);
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}
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static __always_inline __attribute_const__ u16 __arch_bitrev16(u16 x)
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{
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return __arch_bitrev32(x) >> 16;
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}
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static __always_inline __attribute_const__ u8 __arch_bitrev8(u8 x)
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{
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unsigned long result;
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if (!riscv_has_extension_likely(RISCV_ISA_EXT_ZBKB))
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return generic___bitrev8(x);
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asm volatile(
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".option push\n"
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".option arch,+zbkb\n"
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"brev8 %0, %1\n"
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".option pop"
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: "=r" (result) : "r" ((long)x)
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);
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return result;
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}
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#endif
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