| /* 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> |
| |
| .macro fill_to_64 r0 |
| bstrins.d \r0, \r0, 15, 8 |
| bstrins.d \r0, \r0, 31, 16 |
| bstrins.d \r0, \r0, 63, 32 |
| .endm |
| |
| SYM_FUNC_START(memset) |
| /* |
| * Some CPUs support hardware unaligned access |
| */ |
| ALTERNATIVE "b __memset_generic", \ |
| "b __memset_fast", CPU_FEATURE_UAL |
| SYM_FUNC_END(memset) |
| |
| EXPORT_SYMBOL(memset) |
| |
| /* |
| * void *__memset_generic(void *s, int c, size_t n) |
| * |
| * a0: s |
| * a1: c |
| * a2: n |
| */ |
| SYM_FUNC_START(__memset_generic) |
| move a3, a0 |
| beqz a2, 2f |
| |
| 1: st.b a1, a0, 0 |
| addi.d a0, a0, 1 |
| addi.d a2, a2, -1 |
| bgt a2, zero, 1b |
| |
| 2: move a0, a3 |
| jr ra |
| SYM_FUNC_END(__memset_generic) |
| |
| /* |
| * void *__memset_fast(void *s, int c, size_t n) |
| * |
| * a0: s |
| * a1: c |
| * a2: n |
| */ |
| SYM_FUNC_START(__memset_fast) |
| move a3, a0 |
| beqz a2, 3f |
| |
| ori a4, zero, 64 |
| blt a2, a4, 2f |
| |
| /* fill a1 to 64 bits */ |
| fill_to_64 a1 |
| |
| /* set 64 bytes at a time */ |
| 1: st.d a1, a0, 0 |
| st.d a1, a0, 8 |
| st.d a1, a0, 16 |
| st.d a1, a0, 24 |
| st.d a1, a0, 32 |
| st.d a1, a0, 40 |
| st.d a1, a0, 48 |
| st.d a1, a0, 56 |
| |
| addi.d a0, a0, 64 |
| addi.d a2, a2, -64 |
| bge a2, a4, 1b |
| |
| beqz a2, 3f |
| |
| /* set the remaining bytes */ |
| 2: st.b a1, a0, 0 |
| addi.d a0, a0, 1 |
| addi.d a2, a2, -1 |
| bgt a2, zero, 2b |
| |
| /* return */ |
| 3: move a0, a3 |
| jr ra |
| SYM_FUNC_END(__memset_fast) |
