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

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *
  4  * Copyright (C) IBM Corporation, 2011
  5  *
  6  * Authors: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
  7  *          Anton Blanchard <anton@au.ibm.com>
  8  */
  9 #include <linux/uaccess.h>
 10 #include <linux/hardirq.h>
 11 #include <asm/switch_to.h>
 12 
 13 int enter_vmx_usercopy(void)
 14 {
 15         if (in_interrupt())
 16                 return 0;
 17 
 18         preempt_disable();
 19         /*
 20          * We need to disable page faults as they can call schedule and
 21          * thus make us lose the VMX context. So on page faults, we just
 22          * fail which will cause a fallback to the normal non-vmx copy.
 23          */
 24         pagefault_disable();
 25 
 26         enable_kernel_altivec();
 27 
 28         return 1;
 29 }
 30 
 31 /*
 32  * This function must return 0 because we tail call optimise when calling
 33  * from __copy_tofrom_user_power7 which returns 0 on success.
 34  */
 35 int exit_vmx_usercopy(void)
 36 {
 37         disable_kernel_altivec();
 38         pagefault_enable();
 39         preempt_enable();
 40         return 0;
 41 }
 42 
 43 int enter_vmx_ops(void)
 44 {
 45         if (in_interrupt())
 46                 return 0;
 47 
 48         preempt_disable();
 49 
 50         enable_kernel_altivec();
 51 
 52         return 1;
 53 }
 54 
 55 /*
 56  * All calls to this function will be optimised into tail calls. We are
 57  * passed a pointer to the destination which we return as required by a
 58  * memcpy implementation.
 59  */
 60 void *exit_vmx_ops(void *dest)
 61 {
 62         disable_kernel_altivec();
 63         preempt_enable();
 64         return dest;
 65 }
 66 

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