seperate checksum and code generating code.

use mmap instead of file io


git-svn-id: svn://svn.coreboot.org/coreboot/trunk@1504 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1

util/getpir/checksum.c

@@ -0,0 +1,14 @@
+#include <arch/pirq_routing.h>
+
+#include "checksum.h"
+
+int calc_checksum(struct irq_routing_table *rt)
+{
+	long i;
+	uint8_t *addr, sum = 0;
+
+	addr = (uint8_t *) rt;
+	for (i = 0; i < rt->size; i++)
+		sum += addr[i];
+	return (sum);
+}