svn commit: r309167 - head/sys/powerpc/include

[Justin Hibbits]

Author: jhibbits
Date: Fri Nov 25 19:36:27 2016
New Revision: 309167
URL: https://svnweb.freebsd.org/changeset/base/309167

Log:
  Add an isync to after mtsrin, required by the MPC750 errata
  
  MPC750 User Manual Errata (rev 1) adds a note to C.4.2.2 noting that mtsr,
  mtsrin, and mtmsr all require a isync after the instruction and before data
  address translation uses any of the segment registers.  This should make FreeBSD
  run correctly on the G3 again.
  
  Reported by:	Mark Millard
  MFC after:	1 week

Modified:
  head/sys/powerpc/include/cpufunc.h

Modified: head/sys/powerpc/include/cpufunc.h
==============================================================================
--- head/sys/powerpc/include/cpufunc.h	Fri Nov 25 19:25:20 2016	(r309166)
+++ head/sys/powerpc/include/cpufunc.h	Fri Nov 25 19:36:27 2016	(r309167)
@@ -82,7 +82,7 @@ static __inline void
 mtsrin(vm_offset_t va, register_t value)
 {
 
-	__asm __volatile ("mtsrin %0,%1" :: "r"(value), "r"(va));
+	__asm __volatile ("mtsrin %0,%1; isync" :: "r"(value), "r"(va));
 }
 
 static __inline register_t