patch-2.4.19 linux-2.4.19/arch/ia64/sn/kernel/probe.c

• Lines: 82
• Date: Fri Aug 2 17:39:43 2002
• Orig file: linux-2.4.18/arch/ia64/sn/kernel/probe.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.18/arch/ia64/sn/kernel/probe.c linux-2.4.19/arch/ia64/sn/kernel/probe.c
@@ -0,0 +1,81 @@
+/*
+ * Platform dependent support for IO probing.
+ *
+ * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All rights reserved.
+ * 
+ * This program is free software; you can redistribute it and/or modify it 
+ * under the terms of version 2 of the GNU General Public License 
+ * as published by the Free Software Foundation.
+ * 
+ * This program is distributed in the hope that it would be useful, but 
+ * WITHOUT ANY WARRANTY; without even the implied warranty of 
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 
+ * 
+ * Further, this software is distributed without any warranty that it is 
+ * free of the rightful claim of any third person regarding infringement 
+ * or the like.  Any license provided herein, whether implied or 
+ * otherwise, applies only to this software file.  Patent licenses, if 
+ * any, provided herein do not apply to combinations of this program with 
+ * other software, or any other product whatsoever.
+ * 
+ * You should have received a copy of the GNU General Public 
+ * License along with this program; if not, write the Free Software 
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ * 
+ * Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, 
+ * Mountain View, CA  94043, or:
+ * 
+ * http://www.sgi.com 
+ * 
+ * For further information regarding this notice, see: 
+ * 
+ * http://oss.sgi.com/projects/GenInfo/NoticeExplan
+ */
+
+#include <asm/sn/sn_sal.h>
+
+/**
+ * ia64_sn_probe_io_slot - test a memory location for readability
+ * @paddr: physical address to probe
+ * @size: number bytes to read (1,2,4,8)
+ * @data_ptr: address to store value read by probe (-1 returned if probe fails)
+ *
+ * This function will probe a physical address to determine if
+ * the address can be read. If reading the address causes a BUS
+ * error, an error is returned. If the probe succeeds, the contents 
+ * of the memory location is returned.
+ *
+ * Return values:
+ *  0 - probe successful
+ *  1 - probe failed (generated MCA)
+ *  2 - Bad arg
+ * <0 - PAL error
+ */
+u64
+ia64_sn_probe_io_slot(long paddr, long size, void *data_ptr)
+{
+	struct ia64_sal_retval isrv;
+
+	SAL_CALL(isrv, SN_SAL_PROBE, paddr, size, 0, 0, 0, 0, 0);
+
+	if (data_ptr) {
+		switch (size) {
+			case 1:
+				*((u8*)data_ptr) = (u8)isrv.v0;
+				break;
+			case 2:
+				*((u16*)data_ptr) = (u16)isrv.v0;
+				break;
+			case 4:
+				*((u32*)data_ptr) = (u32)isrv.v0;
+				break;
+			case 8:
+				*((u64*)data_ptr) = (u64)isrv.v0;
+				break;
+			default:
+				isrv.status = 2;	
+		}
+	}
+
+	return isrv.status;
+}