drivers/generic/cbfs-uuid: Add driver to include UUID from CBFS

When system_uuid CBFS file is present and contains the UUID
in a string format, the driver will parse it and convert to binary
format to populate the SMBIOS type 1 UUID field.

TEST=Add UUID file and boot MSI PRO Z690-A DDR4 WIFI and check with
dmidecode if the UUID is populated correctly.

Signed-off-by: Michał Żygowski <michal.zygowski@3mdeb.com>
Change-Id: I22f22f4e8742716283d2fcaba4894c06cef3a4bf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64639
Reviewed-by: Krystian Hebel <krystian.hebel@3mdeb.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/drivers/generic/cbfs-uuid/Kconfig

@@ -0,0 +1,6 @@
+config DRIVERS_GENERIC_CBFS_UUID
+	bool "System UUID in CBFS"
+	default n
+	help
+	  Enable this option to read the SMBIOS system UUID from a
+	  text file located in CBFS.

src/drivers/generic/cbfs-uuid/Makefile.inc

@@ -0,0 +1 @@
+ramstage-$(CONFIG_DRIVERS_GENERIC_CBFS_UUID) += cbfs-uuid.c

src/drivers/generic/cbfs-uuid/cbfs-uuid.c

@@ -0,0 +1,23 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <cbfs.h>
+#include <device/device.h>
+#include <smbios.h>
+#include <string.h>
+#include <uuid.h>
+
+void smbios_system_set_uuid(u8 *uuid)
+{
+	/* Add 3 more bytes: 2 for possible CRLF and third for NULL char */
+	char uuid_str[UUID_STRLEN + 3] = {0};
+	uint8_t system_uuid[UUID_LEN];
+
+	size_t uuid_len = cbfs_load("system_uuid", uuid_str, UUID_STRLEN);
+
+	if (uuid_len >= UUID_STRLEN && uuid_len <= UUID_STRLEN + 3) {
+		/* Cut off any trailing whitespace like CR or LF */
+		uuid_str[UUID_STRLEN] = '\0';
+		if (!parse_uuid(system_uuid, uuid_str))
+			memcpy(uuid, system_uuid, UUID_LEN);
+	}
+}