From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: 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 Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior 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 --- kernel/arch/x86/lib/cmpxchg8b_emu.S | 55 +++++++++++++++++++++++++++++++++++++ 1 file changed, 55 insertions(+) create mode 100644 kernel/arch/x86/lib/cmpxchg8b_emu.S (limited to 'kernel/arch/x86/lib/cmpxchg8b_emu.S') diff --git a/kernel/arch/x86/lib/cmpxchg8b_emu.S b/kernel/arch/x86/lib/cmpxchg8b_emu.S new file mode 100644 index 000000000..b4807fce5 --- /dev/null +++ b/kernel/arch/x86/lib/cmpxchg8b_emu.S @@ -0,0 +1,55 @@ +/* + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; version 2 + * of the License. + * + */ + +#include +#include + +.text + +/* + * Inputs: + * %esi : memory location to compare + * %eax : low 32 bits of old value + * %edx : high 32 bits of old value + * %ebx : low 32 bits of new value + * %ecx : high 32 bits of new value + */ +ENTRY(cmpxchg8b_emu) +CFI_STARTPROC + +# +# Emulate 'cmpxchg8b (%esi)' on UP except we don't +# set the whole ZF thing (caller will just compare +# eax:edx with the expected value) +# + pushfl_cfi + cli + + cmpl (%esi), %eax + jne .Lnot_same + cmpl 4(%esi), %edx + jne .Lhalf_same + + movl %ebx, (%esi) + movl %ecx, 4(%esi) + + CFI_REMEMBER_STATE + popfl_cfi + ret + + CFI_RESTORE_STATE +.Lnot_same: + movl (%esi), %eax +.Lhalf_same: + movl 4(%esi), %edx + + popfl_cfi + ret + +CFI_ENDPROC +ENDPROC(cmpxchg8b_emu) -- cgit 1.2.3-korg