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From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 28 Mar 2012 16:32:17 +0000 (UTC)
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Subject: svn commit: r233613 - head/sys/x86/include
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Author: jhb
Date: Wed Mar 28 16:32:17 2012
New Revision: 233613
URL: http://svn.freebsd.org/changeset/base/233613

Log:
  Move the DTrace return IDT vector back up from 0x20 to 0x92.  The 0x20
  vector is currently dedicated to servicing IRQ 0 from the 8259A's, so
  it shouldn't be overloaded for DTrace.
  
  Tested by:	rstone
  MFC after:	1 week

Modified:
  head/sys/x86/include/segments.h

Modified: head/sys/x86/include/segments.h
==============================================================================
--- head/sys/x86/include/segments.h	Wed Mar 28 16:32:15 2012	(r233612)
+++ head/sys/x86/include/segments.h	Wed Mar 28 16:32:17 2012	(r233613)
@@ -215,8 +215,8 @@ union descriptor {
 #define	IDT_MC		18	/* #MC: Machine Check */
 #define	IDT_XF		19	/* #XF: SIMD Floating-Point Exception */
 #define	IDT_IO_INTS	NRSVIDT	/* Base of IDT entries for I/O interrupts. */
-#define	IDT_DTRACE_RET	0x20	/* DTrace pid provider Interrupt Vector */
 #define	IDT_SYSCALL	0x80	/* System Call Interrupt Vector */
+#define	IDT_DTRACE_RET	0x92	/* DTrace pid provider Interrupt Vector */
 
 #if defined(__i386__) || defined(__ia64__)
 /*