patch-2.4.22 linux-2.4.22/arch/mips/arc/promlib.c

• Lines: 44
• Date: 2003-08-25 04:44:39.000000000 -0700
• Orig file: linux-2.4.21/arch/mips/arc/promlib.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/arch/mips/arc/promlib.c linux-2.4.22/arch/mips/arc/promlib.c
@@ -0,0 +1,43 @@
+/*
+ * 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) 1996 David S. Miller (dm@sgi.com)
+ * Compability with board caches, Ulf Carlsson
+ */
+#include <linux/kernel.h>
+#include <asm/sgialib.h>
+#include <asm/bcache.h>
+
+/*
+ * IP22 boardcache is not compatible with board caches.  Thus we disable it
+ * during romvec action.  Since r4xx0.c is always compiled and linked with your
+ * kernel, this shouldn't cause any harm regardless what MIPS processor you
+ * have.
+ *
+ * The ARC write and read functions seem to interfere with the serial lines
+ * in some way. You should be careful with them.
+ */
+
+void prom_putchar(char c)
+{
+	ULONG cnt;
+	CHAR it = c;
+
+	bc_disable();
+	ArcWrite(1, &it, 1, &cnt);
+	bc_enable();
+}
+
+char prom_getchar(void)
+{
+	ULONG cnt;
+	CHAR c;
+
+	bc_disable();
+	ArcRead(0, &c, 1, &cnt);
+	bc_enable();
+
+	return c;
+}