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