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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <asm/alternative-asm.h>
#include <asm/asm.h>
#include <asm/asmmacro.h>
#include <asm/cpu.h>
#include <asm/export.h>
#include <asm/regdef.h>
SYM_FUNC_START(memcpy)
/*
* Some CPUs support hardware unaligned access
*/
ALTERNATIVE "b __memcpy_generic", \
"b __memcpy_fast", CPU_FEATURE_UAL
SYM_FUNC_END(memcpy)
_ASM_NOKPROBE(memcpy)
EXPORT_SYMBOL(memcpy)
/*
* void *__memcpy_generic(void *dst, const void *src, size_t n)
*
* a0: dst
* a1: src
* a2: n
*/
SYM_FUNC_START(__memcpy_generic)
move a3, a0
beqz a2, 2f
1: ld.b t0, a1, 0
st.b t0, a0, 0
addi.d a0, a0, 1
addi.d a1, a1, 1
addi.d a2, a2, -1
bgt a2, zero, 1b
2: move a0, a3
jr ra
SYM_FUNC_END(__memcpy_generic)
_ASM_NOKPROBE(__memcpy_generic)
/*
* void *__memcpy_fast(void *dst, const void *src, size_t n)
*
* a0: dst
* a1: src
* a2: n
*/
SYM_FUNC_START(__memcpy_fast)
move a3, a0
beqz a2, 3f
ori a4, zero, 64
blt a2, a4, 2f
/* copy 64 bytes at a time */
1: ld.d t0, a1, 0
ld.d t1, a1, 8
ld.d t2, a1, 16
ld.d t3, a1, 24
ld.d t4, a1, 32
ld.d t5, a1, 40
ld.d t6, a1, 48
ld.d t7, a1, 56
st.d t0, a0, 0
st.d t1, a0, 8
st.d t2, a0, 16
st.d t3, a0, 24
st.d t4, a0, 32
st.d t5, a0, 40
st.d t6, a0, 48
st.d t7, a0, 56
addi.d a0, a0, 64
addi.d a1, a1, 64
addi.d a2, a2, -64
bge a2, a4, 1b
beqz a2, 3f
/* copy the remaining bytes */
2: ld.b t0, a1, 0
st.b t0, a0, 0
addi.d a0, a0, 1
addi.d a1, a1, 1
addi.d a2, a2, -1
bgt a2, zero, 2b
/* return */
3: move a0, a3
jr ra
SYM_FUNC_END(__memcpy_fast)
_ASM_NOKPROBE(__memcpy_fast)
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