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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/arm64/lib/copy_in_user.S | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/arm64/lib/copy_in_user.S')
-rw-r--r-- | kernel/arch/arm64/lib/copy_in_user.S | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/kernel/arch/arm64/lib/copy_in_user.S b/kernel/arch/arm64/lib/copy_in_user.S new file mode 100644 index 000000000..84b6c9bb9 --- /dev/null +++ b/kernel/arch/arm64/lib/copy_in_user.S @@ -0,0 +1,63 @@ +/* + * Copy from user space to user space + * + * Copyright (C) 2012 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 <linux/linkage.h> +#include <asm/assembler.h> + +/* + * Copy from user space to user space (alignment handled by the hardware) + * + * Parameters: + * x0 - to + * x1 - from + * x2 - n + * Returns: + * x0 - bytes not copied + */ +ENTRY(__copy_in_user) + add x4, x0, x2 // upper user buffer boundary + subs x2, x2, #8 + b.mi 2f +1: +USER(9f, ldr x3, [x1], #8 ) + subs x2, x2, #8 +USER(9f, str x3, [x0], #8 ) + b.pl 1b +2: adds x2, x2, #4 + b.mi 3f +USER(9f, ldr w3, [x1], #4 ) + sub x2, x2, #4 +USER(9f, str w3, [x0], #4 ) +3: adds x2, x2, #2 + b.mi 4f +USER(9f, ldrh w3, [x1], #2 ) + sub x2, x2, #2 +USER(9f, strh w3, [x0], #2 ) +4: adds x2, x2, #1 + b.mi 5f +USER(9f, ldrb w3, [x1] ) +USER(9f, strb w3, [x0] ) +5: mov x0, #0 + ret +ENDPROC(__copy_in_user) + + .section .fixup,"ax" + .align 2 +9: sub x0, x4, x0 // bytes not copied + ret + .previous |