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Linux/arch/powerpc/lib/vmx-helper.c

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  1 /*
  2  * This program is free software; you can redistribute it and/or modify
  3  * it under the terms of the GNU General Public License as published by
  4  * the Free Software Foundation; either version 2 of the License, or
  5  * (at your option) any later version.
  6  *
  7  * This program is distributed in the hope that it will be useful,
  8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 10  * GNU General Public License for more details.
 11  *
 12  * You should have received a copy of the GNU General Public License
 13  * along with this program; if not, write to the Free Software
 14  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 15  *
 16  * Copyright (C) IBM Corporation, 2011
 17  *
 18  * Authors: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
 19  *          Anton Blanchard <anton@au.ibm.com>
 20  */
 21 #include <linux/uaccess.h>
 22 #include <linux/hardirq.h>
 23 #include <asm/switch_to.h>
 24 
 25 int enter_vmx_usercopy(void)
 26 {
 27         if (in_interrupt())
 28                 return 0;
 29 
 30         /* This acts as preempt_disable() as well and will make
 31          * enable_kernel_altivec(). We need to disable page faults
 32          * as they can call schedule and thus make us lose the VMX
 33          * context. So on page faults, we just fail which will cause
 34          * a fallback to the normal non-vmx copy.
 35          */
 36         pagefault_disable();
 37 
 38         enable_kernel_altivec();
 39 
 40         return 1;
 41 }
 42 
 43 /*
 44  * This function must return 0 because we tail call optimise when calling
 45  * from __copy_tofrom_user_power7 which returns 0 on success.
 46  */
 47 int exit_vmx_usercopy(void)
 48 {
 49         pagefault_enable();
 50         return 0;
 51 }
 52 
 53 int enter_vmx_copy(void)
 54 {
 55         if (in_interrupt())
 56                 return 0;
 57 
 58         preempt_disable();
 59 
 60         enable_kernel_altivec();
 61 
 62         return 1;
 63 }
 64 
 65 /*
 66  * All calls to this function will be optimised into tail calls. We are
 67  * passed a pointer to the destination which we return as required by a
 68  * memcpy implementation.
 69  */
 70 void *exit_vmx_copy(void *dest)
 71 {
 72         preempt_enable();
 73         return dest;
 74 }
 75 

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