| Catalin Marinas | 4a89922 | 2013-03-21 16:16:43 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2013 ARM Ltd. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License |
| 14 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 15 | */ |
| 16 | |
| 17 | #include <linux/linkage.h> |
| 18 | #include <asm/assembler.h> |
| 19 | |
| 20 | /* |
| 21 | * Copy a buffer from src to dest (alignment handled by the hardware) |
| 22 | * |
| 23 | * Parameters: |
| 24 | * x0 - dest |
| 25 | * x1 - src |
| 26 | * x2 - n |
| 27 | * Returns: |
| 28 | * x0 - dest |
| 29 | */ |
| 30 | ENTRY(memcpy) |
| 31 | mov x4, x0 |
| 32 | subs x2, x2, #8 |
| 33 | b.mi 2f |
| 34 | 1: ldr x3, [x1], #8 |
| 35 | subs x2, x2, #8 |
| 36 | str x3, [x4], #8 |
| 37 | b.pl 1b |
| 38 | 2: adds x2, x2, #4 |
| 39 | b.mi 3f |
| 40 | ldr w3, [x1], #4 |
| 41 | sub x2, x2, #4 |
| 42 | str w3, [x4], #4 |
| 43 | 3: adds x2, x2, #2 |
| 44 | b.mi 4f |
| 45 | ldrh w3, [x1], #2 |
| 46 | sub x2, x2, #2 |
| 47 | strh w3, [x4], #2 |
| 48 | 4: adds x2, x2, #1 |
| 49 | b.mi 5f |
| 50 | ldrb w3, [x1] |
| 51 | strb w3, [x4] |
| 52 | 5: ret |
| 53 | ENDPROC(memcpy) |