From 1befb38b868248dda4e84a57aa779f7e8c0b85c0 Mon Sep 17 00:00:00 2001
From: Alexander Graf <agraf@suse.de>
Date: Fri, 19 Aug 2016 01:23:21 +0200
Subject: 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>
---
 lib/Makefile      |  1 +
 lib/tables_csum.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 lib/tables_csum.c

(limited to 'lib')

diff --git a/lib/Makefile b/lib/Makefile
index e3383f4046..3842e7d989 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -73,6 +73,7 @@ obj-y += linux_string.o
 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 0000000000..340d7b3b11
--- /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;
+}
-- 
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