diff options
| author | Furquan Shaikh <furquan@google.com> | 2015-06-08 10:31:55 -0700 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-06-23 08:20:11 +0200 |
| commit | 464f5ca6d61c907be83adea15e68cf93b769fb3d (patch) | |
| tree | 408c75232b006a2f1d5b7ddf8cfe6d6875850c02 /src/arch/arm64/memcpy.S | |
| parent | 3cec871eaa772073ab016194eb24bdc6fb3c675c (diff) | |
Revert "arm64: remove assembly code string functions"
This reverts commit 00263d0d8ee23bbe60ea359ea9cb33d551688980
to reintroduce optimized string handling functions.
BUG=chrome-os-partner:41185
BRANCH=None
TEST=Compiles successfully and boots to kernel prompt on Smaug
Change-Id: I47f8d8afa5c9ff3fca67d4d0f393336fef03402b
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: eeb38afea828a2727d815e4fb5762cfdd09a2b3a
Original-Change-Id: Id053cbcea8b5e7ae29bdd6bb8b6f5e5011c42b00
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/275865
Original-Trybot-Ready: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/10564
Tested-by: build bot (Jenkins)
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Diffstat (limited to 'src/arch/arm64/memcpy.S')
| -rw-r--r-- | src/arch/arm64/memcpy.S | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/src/arch/arm64/memcpy.S b/src/arch/arm64/memcpy.S new file mode 100644 index 0000000000..ccad4cf8cc --- /dev/null +++ b/src/arch/arm64/memcpy.S @@ -0,0 +1,52 @@ +/* + * Copyright (C) 2013 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <arch/asm.h> + +/* + * Copy a buffer from src to dest (alignment handled by the hardware) + * + * Parameters: + * x0 - dest + * x1 - src + * x2 - n + * Returns: + * x0 - dest + */ +ENTRY(memcpy) + mov x4, x0 + subs x2, x2, #8 + b.mi 2f +1: ldr x3, [x1], #8 + subs x2, x2, #8 + str x3, [x4], #8 + b.pl 1b +2: adds x2, x2, #4 + b.mi 3f + ldr w3, [x1], #4 + sub x2, x2, #4 + str w3, [x4], #4 +3: adds x2, x2, #2 + b.mi 4f + ldrh w3, [x1], #2 + sub x2, x2, #2 + strh w3, [x4], #2 +4: adds x2, x2, #1 + b.mi 5f + ldrb w3, [x1] + strb w3, [x4] +5: ret +ENDPROC(memcpy) |