sgi-xp: prepare xpc_rsvd_page to work on either sn2 or uv hardware

Prepare XPC's reserved page header to work for either sn2 or uv.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/misc/sgi-xp/xpc_uv.c

@@ -0,0 +1,48 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Copyright (c) 2008 Silicon Graphics, Inc.  All Rights Reserved.
+ */
+
+/*
+ * Cross Partition Communication (XPC) uv-based functions.
+ *
+ *     Architecture specific implementation of common functions.
+ *
+ */
+
+#include <linux/kernel.h>
+
+/* >>> #include <gru/grukservices.h> */
+/* >>> uv_gpa() is defined in <gru/grukservices.h> */
+#define uv_gpa(_a)		((unsigned long)_a)
+
+/* >>> temporarily define next three items for xpc.h */
+#define	SGI_XPC_ACTIVATE	23
+#define	SGI_XPC_NOTIFY		24
+#define sn_send_IPI_phys(_a, _b, _c, _d)
+
+#include "xpc.h"
+
+static void *xpc_activate_mq;
+
+static enum xp_retval
+xpc_rsvd_page_init_uv(struct xpc_rsvd_page *rp)
+{
+	/* >>> need to have established xpc_activate_mq earlier */
+	rp->sn.activate_mq_gpa = uv_gpa(xpc_activate_mq);
+	return xpSuccess;
+}
+
+void
+xpc_init_uv(void)
+{
+	xpc_rsvd_page_init = xpc_rsvd_page_init_uv;
+}
+
+void
+xpc_exit_uv(void)
+{
+}