From 6d9df3b5748b880604a069d555446df9e6ba680e Mon Sep 17 00:00:00 2001
From: kstailey <kstailey@openbsd.org>
Date: Fri, 14 Feb 1997 18:15:23 +0000
Subject: [PATCH] remove old #define of splx() and update rei funciton in
 locore.s

---
 sys/arch/sun3/include/param.h |  3 +-
 sys/arch/sun3/sun3/locore.s   | 91 ++++++++++++++++++++++++++++++++++-
 2 files changed, 91 insertions(+), 3 deletions(-)

diff --git a/sys/arch/sun3/include/param.h b/sys/arch/sun3/include/param.h
index 266312289d4..58273ce19a2 100644
--- a/sys/arch/sun3/include/param.h
+++ b/sys/arch/sun3/include/param.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: param.h,v 1.10 1997/02/14 18:01:59 kstailey Exp $	*/
+/*	$OpenBSD: param.h,v 1.11 1997/02/14 18:15:27 kstailey Exp $	*/
 /*	$NetBSD: param.h,v 1.34 1996/03/04 05:04:40 cgd Exp $	*/
 
 /*
@@ -178,7 +178,6 @@
 #define spl5()  _spl(PSL_S|PSL_IPL5)
 #define spl6()  _spl(PSL_S|PSL_IPL6)
 #define spl7()  _spl(PSL_S|PSL_IPL7)
-#define splx(x)	_spl(x)
 
 /* IPL used by soft interrupts: netintr(), softclock() */
 #define splsoftclock()  spl1()
diff --git a/sys/arch/sun3/sun3/locore.s b/sys/arch/sun3/sun3/locore.s
index 9ab7e0845fb..813d66c8e81 100644
--- a/sys/arch/sun3/sun3/locore.s
+++ b/sys/arch/sun3/sun3/locore.s
@@ -1,4 +1,4 @@
-/*	$OpenBSD: locore.s,v 1.12 1997/02/14 18:01:58 kstailey Exp $	*/
+/*	$OpenBSD: locore.s,v 1.13 1997/02/14 18:15:23 kstailey Exp $	*/
 /*	$NetBSD: locore.s,v 1.40 1996/11/06 20:19:54 cgd Exp $	*/
 
 /*
@@ -696,6 +696,7 @@ _intrcnt:
 _eintrcnt:
 	.text
 
+#if 0
 /*
  * Emulation of VAX REI instruction.
  *
@@ -755,7 +756,95 @@ Laststkadj:
 	movl	sp@,sp			| and our SP
 Ldorte:
 	rte				| real return
+#else
+/*
+ * Emulation of VAX REI instruction.
+ *
+ * This code deals with checking for and servicing ASTs
+ * (profiling, scheduling) and software interrupts (network, softclock).
+ * We check for ASTs first, just like the VAX.  To avoid excess overhead
+ * the T_ASTFLT handling code will also check for software interrupts so we
+ * do not have to do it here.  After identifing that we need an AST we
+ * drop the IPL to allow device interrupts.
+ *
+ * This code is complicated by the fact that sendsig may have been called
+ * necessitating a stack cleanup.
+ */
+	.comm	_ssir,1
+	.globl	_astpending
+	.globl	rei
+rei:
+#ifdef	DIAGNOSTIC
+	tstl	_panicstr		| have we paniced?
+	jne	Ldorte			| yes, do not make matters worse
+#endif
+	tstl	_astpending		| AST pending?
+	jeq	Lchksir			| no, go check for SIR
+Lrei1:
+	btst	#5,sp@			| yes, are we returning to user mode?
+	jne	Lchksir			| no, go check for SIR
+	movw	#PSL_LOWIPL,sr		| lower SPL
+	clrl	sp@-			| stack adjust
+	moveml	#0xFFFF,sp@-		| save all registers
+	movl	usp,a1			| including
+	movl	a1,sp@(FR_SP)		|    the users SP
+Lrei2:
+	clrl	sp@-			| VA == none
+	clrl	sp@-			| code == none
+	movl	#T_ASTFLT,sp@-		| type == async system trap
+	jbsr	_trap			| go handle it
+	lea	sp@(12),sp		| pop value args
+	movl	sp@(FR_SP),a0		| restore user SP
+	movl	a0,usp			|   from save area
+	movw	sp@(FR_ADJ),d0		| need to adjust stack?
+	jne	Laststkadj		| yes, go to it
+	moveml	sp@+,#0x7FFF		| no, restore most user regs
+	addql	#8,sp			| toss SP and stack adjust
+	rte				| and do real RTE
+Laststkadj:
+	lea	sp@(FR_HW),a1		| pointer to HW frame
+	addql	#8,a1			| source pointer
+	movl	a1,a0			| source
+	addw	d0,a0			|  + hole size = dest pointer
+	movl	a1@-,a0@-		| copy
+	movl	a1@-,a0@-		|  8 bytes
+	movl	a0,sp@(FR_SP)		| new SSP
+	moveml	sp@+,#0x7FFF		| restore user registers
+	movl	sp@,sp			| and our SP
+	rte				| and do real RTE
+Lchksir:
+	tstb	_ssir			| SIR pending?
+	jeq	Ldorte			| no, all done
+	movl	d0,sp@-			| need a scratch register
+	movw	sp@(4),d0		| get SR
+	andw	#PSL_IPL7,d0		| mask all but IPL
+	jne	Lnosir			| came from interrupt, no can do
+	movl	sp@+,d0			| restore scratch register
+Lgotsir:
+	movw	#SPL1,sr		| prevent others from servicing int
+	tstb	_ssir			| too late?
+	jeq	Ldorte			| yes, oh well...
+	clrl	sp@-			| stack adjust
+	moveml	#0xFFFF,sp@-		| save all registers
+	movl	usp,a1			| including
+	movl	a1,sp@(FR_SP)		|    the users SP
+Lsir1:
+	clrl	sp@-			| VA == none
+	clrl	sp@-			| code == none
+	movl	#T_SSIR,sp@-		| type == software interrupt
+	jbsr	_trap			| go handle it
+	lea	sp@(12),sp		| pop value args
+	movl	sp@(FR_SP),a0		| restore
+	movl	a0,usp			|   user SP
+	moveml	sp@+,#0x7FFF		| and all remaining registers
+	addql	#8,sp			| pop SP and stack adjust
+	rte
+Lnosir:
+	movl	sp@+,d0			| restore scratch register
+Ldorte:
+	rte				| real return
 
+#endif
 /*
  * Initialization is at the beginning of this file, because the
  * kernel entry point needs to be at zero for compatibility with
-- 
2.20.1