diff options
author | 2015-08-04 12:17:53 -0700 | |
---|---|---|
committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/powerpc/lib/vmx-helper.c | |
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/powerpc/lib/vmx-helper.c')
-rw-r--r-- | kernel/arch/powerpc/lib/vmx-helper.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/kernel/arch/powerpc/lib/vmx-helper.c b/kernel/arch/powerpc/lib/vmx-helper.c new file mode 100644 index 000000000..3cf529cee --- /dev/null +++ b/kernel/arch/powerpc/lib/vmx-helper.c @@ -0,0 +1,74 @@ +/* + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * 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, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * Copyright (C) IBM Corporation, 2011 + * + * Authors: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> + * Anton Blanchard <anton@au.ibm.com> + */ +#include <linux/uaccess.h> +#include <linux/hardirq.h> +#include <asm/switch_to.h> + +int enter_vmx_usercopy(void) +{ + if (in_interrupt()) + return 0; + + /* This acts as preempt_disable() as well and will make + * enable_kernel_altivec(). We need to disable page faults + * as they can call schedule and thus make us lose the VMX + * context. So on page faults, we just fail which will cause + * a fallback to the normal non-vmx copy. + */ + pagefault_disable(); + + enable_kernel_altivec(); + + return 1; +} + +/* + * This function must return 0 because we tail call optimise when calling + * from __copy_tofrom_user_power7 which returns 0 on success. + */ +int exit_vmx_usercopy(void) +{ + pagefault_enable(); + return 0; +} + +int enter_vmx_copy(void) +{ + if (in_interrupt()) + return 0; + + preempt_disable(); + + enable_kernel_altivec(); + + return 1; +} + +/* + * All calls to this function will be optimised into tail calls. We are + * passed a pointer to the destination which we return as required by a + * memcpy implementation. + */ +void *exit_vmx_copy(void *dest) +{ + preempt_enable(); + return dest; +} |