From 802ac63ea3c782b3ecbac7d4ad707eb2552faff3 Mon Sep 17 00:00:00 2001
From: Miod Vallat <miod@cvs.openbsd.org>
Date: Sat, 11 Jul 2009 19:56:05 +0000
Subject: When rebooting, pass a request to the PROM for it to skip diagnostics
 and memory initialization. This reduces memory test and initialization time
 from a "in soviet russia, memory test you" time of over 2 minutes for 1GB on
 Origin 200, to a more reasonable 12 seconds (and on a Fuel with 2GB, time
 goes down from 6 seconds to under a second).

---
 sys/arch/sgi/include/mnode.h    | 16 ++++++++++++++--
 sys/arch/sgi/sgi/ip27_machdep.c | 40 ++++++++++++++++++++++++++++++++++++----
 2 files changed, 50 insertions(+), 6 deletions(-)

diff --git a/sys/arch/sgi/include/mnode.h b/sys/arch/sgi/include/mnode.h
index 65bfec9c657..d0bbd0a72e9 100644
--- a/sys/arch/sgi/include/mnode.h
+++ b/sys/arch/sgi/include/mnode.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mnode.h,v 1.8 2009/07/06 22:46:40 miod Exp $ */
+/*	$OpenBSD: mnode.h,v 1.9 2009/07/11 19:56:02 miod Exp $ */
 
 /*
  * Copyright (c) 2004 Opsycon AB  (www.opsycon.se / www.opsycon.com)
@@ -373,7 +373,7 @@ typedef struct gda {
 	uint32_t	 magic;			/* GDA_MAGIC */
 	uint16_t	 ver;
 	uint16_t	 masternasid;		/* NASID of the master cpu */
-	uint32_t	 promop;
+	uint32_t	 promop;		/* Request to pass to PROM */
 	uint32_t	 switches;
 	void		*tlb_handlers[3];
 	uint		 partid;
@@ -385,6 +385,18 @@ typedef struct gda {
 	int16_t		 nasid[GDA_MAXNODES];	/* NASID of connected nodes */
 } gda_t;
 
+#define	GDA_PROMOP_MAGIC	0x0ead0000
+/* commands */
+#define	GDA_PROMOP_HALT		0x00000010
+#define	GDA_PROMOP_POWERDOWN	0x00000020
+#define	GDA_PROMOP_RESTART	0x00000030
+#define	GDA_PROMOP_REBOOT	0x00000040
+#define	GDA_PROMOP_EIM		0x00000050
+/* options */
+#define	GDA_PROMOP_NO_DIAGS	0x00000100	/* don't run diagnostics */
+#define	GDA_PROMOP_NO_MEMINIT	0x00000200	/* don't initialize memory */
+#define	GDA_PROMOP_NO_DEVINIT	0x00000400	/* don't initialize devices */
+
 /* ========== */
 
 /*
diff --git a/sys/arch/sgi/sgi/ip27_machdep.c b/sys/arch/sgi/sgi/ip27_machdep.c
index 081ce363da6..ebb3cfb4dff 100644
--- a/sys/arch/sgi/sgi/ip27_machdep.c
+++ b/sys/arch/sgi/sgi/ip27_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip27_machdep.c,v 1.16 2009/07/06 22:46:43 miod Exp $	*/
+/*	$OpenBSD: ip27_machdep.c,v 1.17 2009/07/11 19:56:04 miod Exp $	*/
 
 /*
  * Copyright (c) 2008, 2009 Miodrag Vallat.
@@ -397,17 +397,49 @@ ip27_widget_id(int16_t nasid, u_int widget, uint32_t *wid)
 void
 ip27_halt(int howto)
 {
+	uint32_t promop;
+
 	/*
 	 * Even if ARCBios TLB and exception vectors are restored,
 	 * returning to ARCBios doesn't work.
 	 *
 	 * So, instead, send a reset through the network interface
-	 * of the Hub space.  Unfortunately there is no known way
-	 * to tell the PROM which action we want it to take afterwards.
+	 * of the Hub space.  Although there seems to be a way to tell
+	 * the PROM which action we want it to take afterwards, it
+	 * always reboots for me...
 	 */
 
-	if (howto & RB_HALT)
+	if (howto & RB_HALT) {
+#if 0
+		if (howto & RB_POWERDOWN)
+			promop = GDA_PROMOP_HALT;
+		else
+			promop = GDA_PROMOP_EIM;
+#else
 		return;	/* caller will spin */
+#endif
+	} else
+		promop = GDA_PROMOP_REBOOT;
+
+	promop |= GDA_PROMOP_MAGIC | GDA_PROMOP_NO_DIAGS |
+	    GDA_PROMOP_NO_MEMINIT;
+
+#if 0
+	/*
+	 * That's what one would expect, based on the gda layout...
+	 */
+	gda->promop = promop;
+#else
+	/*
+	 * ...but the magic location is in a different castle.
+	 * And it's not even the same between IP27 and IP35.
+	 * Laugh, everyone! It's what SGI wants us to.
+	 */
+	if (ip35)
+		IP27_LHUB_S(HUBLBBASE_IP35 + 0x8010, promop);
+	else
+		IP27_LHUB_S(HUBPIBASE + 0x418, promop);
+#endif
 
 	if (ip35) {
 		IP27_LHUB_S(HUBNIBASE_IP35 + HUBNI_RESET_ENABLE,
-- 
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