diff --git a/arch/x86/include/asm/tables.h b/arch/x86/include/asm/tables.h
index ae9f0d0..81f98f2 100644
--- a/arch/x86/include/asm/tables.h
+++ b/arch/x86/include/asm/tables.h
@@ -7,6 +7,8 @@
 #ifndef _X86_TABLES_H_
 #define _X86_TABLES_H_
 
+#include <tables_csum.h>
+
 /*
  * All x86 tables happen to like the address range from 0xf0000 to 0x100000.
  * We use 0xf0000 as the starting address to store those tables, including
diff --git a/arch/x86/lib/tables.c b/arch/x86/lib/tables.c
index f92111e..9ee6b5e 100644
--- a/arch/x86/lib/tables.c
+++ b/arch/x86/lib/tables.c
@@ -38,18 +38,6 @@ static table_write table_write_funcs[] = {
 #endif
 };
 
-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;
-}
-
 void table_fill_string(char *dest, const char *src, size_t n, char pad)
 {
 	int start, len;
diff --git a/include/tables_csum.h b/include/tables_csum.h
new file mode 100644
index 0000000..a021efb
--- /dev/null
+++ b/include/tables_csum.h
@@ -0,0 +1,12 @@
+/*
+ * Copyright (C) 2015, Bin Meng <bmeng.cn@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef _TABLES_CSUM_H_
+#define _TABLES_CSUM_H_
+
+u8 table_compute_checksum(void *v, int len);
+
+#endif
diff --git a/lib/Makefile b/lib/Makefile
index e3383f4..3842e7d 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 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;
+}