patch-2.4.4 linux/arch/ia64/sn/sn1/probe.c

• Lines: 63
• Date: Thu Apr 5 12:51:47 2001
• Orig file: v2.4.3/linux/arch/ia64/sn/sn1/probe.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/arch/ia64/sn/sn1/probe.c linux/arch/ia64/sn/sn1/probe.c
@@ -0,0 +1,62 @@
+/*
+ * Platform dependent support for IO probing.
+ *
+ * Copyright (C) 2000   Silicon Graphics
+ * Copyright (C) 2000   Jack Steiner (steiner@sgi.com)
+ */
+
+#include <asm/sn/sn_sal.h>
+
+/*
+ * ia64_sn_probe_io_slot
+ *	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.
+ *
+ *   Calling sequence:
+ *		ia64_probe_io_slot(paddr, size, data_ptr)
+ *
+ *   Input:
+ *	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)
+ *
+ *   Output:
+ *	Status
+ *		 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;
+}