From 6f7839e542ee18770288be75114bd2e6771e1421 Mon Sep 17 00:00:00 2001 From: Anton Blanchard Date: Tue, 29 May 2012 19:31:24 +0000 Subject: powerpc: Rename copyuser_power7_vmx.c to vmx-helper.c Subsequent patches will add more VMX library functions and it makes sense to keep all the c-code helper functions in the one file. Signed-off-by: Anton Blanchard Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/lib/vmx-helper.c | 51 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) create mode 100644 arch/powerpc/lib/vmx-helper.c (limited to 'arch/powerpc/lib/vmx-helper.c') diff --git a/arch/powerpc/lib/vmx-helper.c b/arch/powerpc/lib/vmx-helper.c new file mode 100644 index 00000000000..753a839f4a1 --- /dev/null +++ b/arch/powerpc/lib/vmx-helper.c @@ -0,0 +1,51 @@ +/* + * 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 + * Anton Blanchard + */ +#include +#include +#include + +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; +} -- cgit v1.2.3-70-g09d2