From 8cd1f0b28c845bda4d97b010fc213f6164ce80e8 Mon Sep 17 00:00:00 2001
From: Mark Kettenis <kettenis@cvs.openbsd.org>
Date: Sun, 12 Apr 2009 22:17:53 +0000
Subject: Implement /dev/mdesc, a device to read the machine description on
 sun4v (virtual) machines.

---
 sys/arch/sparc64/include/conf.h     |  4 ++--
 sys/arch/sparc64/sparc64/openprom.c | 34 +++++++++++++++++++++++++++++++++-
 2 files changed, 35 insertions(+), 3 deletions(-)

(limited to 'sys/arch/sparc64')

diff --git a/sys/arch/sparc64/include/conf.h b/sys/arch/sparc64/include/conf.h
index 358e74b792c..20aaab95411 100644
--- a/sys/arch/sparc64/include/conf.h
+++ b/sys/arch/sparc64/include/conf.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: conf.h,v 1.18 2008/07/07 14:46:18 kettenis Exp $	*/
+/*	$OpenBSD: conf.h,v 1.19 2009/04/12 22:17:52 kettenis Exp $	*/
 /*	$NetBSD: conf.h,v 1.9 2001/03/26 12:33:26 lukem Exp $	*/
 
 /*-
@@ -38,7 +38,7 @@ cdev_decl(openprom);
 
 /* open, close, ioctl */
 #define cdev_openprom_init(c,n) { \
-	dev_init(c,n,open), dev_init(c,n,close), (dev_type_read((*))) enodev, \
+	dev_init(c,n,open), dev_init(c,n,close), dev_init(c,n,read), \
 	(dev_type_write((*))) enodev, dev_init(c,n,ioctl), \
 	(dev_type_stop((*))) nullop, 0, (dev_type_poll((*))) enodev, \
 	(dev_type_mmap((*))) enodev }
diff --git a/sys/arch/sparc64/sparc64/openprom.c b/sys/arch/sparc64/sparc64/openprom.c
index ac38ccc2171..06c51775fb8 100644
--- a/sys/arch/sparc64/sparc64/openprom.c
+++ b/sys/arch/sparc64/sparc64/openprom.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: openprom.c,v 1.14 2009/03/21 12:24:26 kettenis Exp $	*/
+/*	$OpenBSD: openprom.c,v 1.15 2009/04/12 22:17:52 kettenis Exp $	*/
 /*	$NetBSD: openprom.c,v 1.4 2002/01/10 06:21:53 briggs Exp $ */
 
 /*
@@ -53,6 +53,7 @@
 #include <machine/openpromio.h>
 #include <machine/autoconf.h>
 #include <machine/conf.h>
+#include <machine/mdesc.h>
 
 #include <dev/clock_subr.h>
 #include <dev/ofw/openfirm.h>
@@ -87,6 +88,37 @@ openpromclose(dev, flags, mode, p)
 	return (0);
 }
 
+int
+openpromread(dev_t dev, struct uio *uio, int flags)
+{
+#ifdef SUN4V
+	int error;
+	size_t len;
+	caddr_t v;
+
+	if (minor(dev) != 1)
+		return (ENXIO);
+
+	while (uio->uio_resid > 0) {
+		if (uio->uio_offset >= mdesc_len)
+			break;
+
+		v = mdesc + uio->uio_offset;
+		len = mdesc_len - uio->uio_offset;
+		if (len > uio->uio_resid)
+			len = uio->uio_resid;
+		
+		error = uiomove(v, len, uio);
+		if (error)
+			return (error);
+	}
+
+	return (0);
+#else
+	return (ENXIO);
+#endif
+}
+
 /*
  * Verify target ID is valid (exists in the OPENPROM tree), as
  * listed from node ID sid forward.
-- 
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