openrisc: Add cpu files

Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>

1 files changed, 85 insertions, 0 deletions

diff --git a/arch/openrisc/cpu/exceptions.c b/arch/openrisc/cpu/exceptions.c
new file mode 100644
index 0000000000..5d9f117df0
--- /dev/null
+++ b/arch/openrisc/cpu/exceptions.c
@@ -0,0 +1,85 @@
+/*
+ * (C) Copyright 2011, Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
+ * (C) Copyright 2011, Julius Baxter <julius@opencores.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <common.h>
+#include <stdio_dev.h>
+#include <asm/system.h>
+
+static const char * const excp_table[] = {
+	"Unknown exception",
+	"Reset",
+	"Bus Error",
+	"Data Page Fault",
+	"Instruction Page Fault",
+	"Tick Timer",
+	"Alignment",
+	"Illegal Instruction",
+	"External Interrupt",
+	"D-TLB Miss",
+	"I-TLB Miss",
+	"Range",
+	"System Call",
+	"Floating Point",
+	"Trap",
+};
+
+static void (*handlers[32])(void);
+
+void exception_install_handler(int exception, void (*handler)(void))
+{
+	if (exception < 0 || exception > 31)
+		return;
+
+	handlers[exception] = handler;
+}
+
+void exception_free_handler(int exception)
+{
+	if (exception < 0 || exception > 31)
+		return;
+
+	handlers[exception] = 0;
+}
+
+static void exception_hang(int vect)
+{
+	printf("Unhandled exception at 0x%x ", vect & 0xff00);
+
+	vect = ((vect >> 8) & 0xff);
+	if (vect < ARRAY_SIZE(excp_table))
+		printf("(%s)\n", excp_table[vect]);
+	else
+		printf("(%s)\n", excp_table[0]);
+
+	printf("EPCR: 0x%08lx\n", mfspr(SPR_EPCR_BASE));
+	printf("EEAR: 0x%08lx\n", mfspr(SPR_EEAR_BASE));
+	printf("ESR:  0x%08lx\n", mfspr(SPR_ESR_BASE));
+	hang();
+}
+
+void exception_handler(int vect)
+{
+	int exception = vect >> 8;
+
+	if (handlers[exception])
+		handlers[exception]();
+	else
+		exception_hang(vect);
+}