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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 #include <asm/asm-prototypes.h>
 13 
 14 int enter_vmx_usercopy(void)
 15 {
 16         if (in_interrupt())
 17                 return 0;
 18 
 19         preempt_disable();
 20         /*
 21          * We need to disable page faults as they can call schedule and
 22          * thus make us lose the VMX context. So on page faults, we just
 23          * fail which will cause a fallback to the normal non-vmx copy.
 24          */
 25         pagefault_disable();
 26 
 27         enable_kernel_altivec();
 28 
 29         return 1;
 30 }
 31 
 32 /*
 33  * This function must return 0 because we tail call optimise when calling
 34  * from __copy_tofrom_user_power7 which returns 0 on success.
 35  */
 36 int exit_vmx_usercopy(void)
 37 {
 38         disable_kernel_altivec();
 39         pagefault_enable();
 40         preempt_enable();
 41         return 0;
 42 }
 43 
 44 int enter_vmx_ops(void)
 45 {
 46         if (in_interrupt())
 47                 return 0;
 48 
 49         preempt_disable();
 50 
 51         enable_kernel_altivec();
 52 
 53         return 1;
 54 }
 55 
 56 /*
 57  * All calls to this function will be optimised into tail calls. We are
 58  * passed a pointer to the destination which we return as required by a
 59  * memcpy implementation.
 60  */
 61 void *exit_vmx_ops(void *dest)
 62 {
 63         disable_kernel_altivec();
 64         preempt_enable();
 65         return dest;
 66 }
 67 

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