x86: Move table csum into separate file
We need the checksum function without all the other table functionality
soon, so let's split it out into its own C file.
Signed-off-by: Alexander Graf <agraf@suse.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/lib/Makefile b/lib/Makefile
index e3383f4..3842e7d 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -73,6 +73,7 @@
obj-y += membuff.o
obj-$(CONFIG_REGEX) += slre.o
obj-y += string.o
+obj-y += tables_csum.o
obj-y += time.o
obj-$(CONFIG_TRACE) += trace.o
obj-$(CONFIG_LIB_UUID) += uuid.o
diff --git a/lib/tables_csum.c b/lib/tables_csum.c
new file mode 100644
index 0000000..340d7b3
--- /dev/null
+++ b/lib/tables_csum.c
@@ -0,0 +1,20 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <linux/ctype.h>
+
+u8 table_compute_checksum(void *v, int len)
+{
+ u8 *bytes = v;
+ u8 checksum = 0;
+ int i;
+
+ for (i = 0; i < len; i++)
+ checksum -= bytes[i];
+
+ return checksum;
+}