From 2f4b60c5a94a6cbc5e95bdef20641b1a33fe56a5 Mon Sep 17 00:00:00 2001
From: Bruce Evans <bde@FreeBSD.org>
Date: Sun, 29 Dec 1996 22:05:23 +0000
Subject: Fixed keeping track of interrupt nesting level across ASTs.  It
 sometimes became -1, and this recently became fatal if an address error
 occurs in copyin/out/etc.

---
 sys/i386/isa/icu.s | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'sys')

diff --git a/sys/i386/isa/icu.s b/sys/i386/isa/icu.s
index 567daf112550..d0f165b3922a 100644
--- a/sys/i386/isa/icu.s
+++ b/sys/i386/isa/icu.s
@@ -36,7 +36,7 @@
  *
  *	@(#)icu.s	7.2 (Berkeley) 5/21/91
  *
- *	$Id: icu.s,v 1.25 1996/05/31 01:08:07 peter Exp $
+ *	$Id: icu.s,v 1.26 1996/10/30 22:38:46 asami Exp $
  */
 
 /*
@@ -181,8 +181,10 @@ swi_ast:
 	testb	$SEL_RPL_MASK,TRAPF_CS_OFF(%esp)
 	je	swi_ast_phantom
 	movl	$T_ASTFLT,(2+8+0)*4(%esp)
+	movb	$0,_intr_nesting_level	/* finish becoming a trap handler */
 	call	_trap
 	subl	%eax,%eax		/* recover cpl */
+	movb	$1,_intr_nesting_level	/* for doreti_next to decrement */
 	jmp	doreti_next
 
 	ALIGN_TEXT
-- 
cgit v1.3