vpd: retrieve mac addresses and pass them to bootloader

Chrome OS devices firmware usually includes an area called VPD (Vital
Product Data). VPD is a blob of a certain structure, in particular
containing freely defined variable size fields. A field is a tuple of
the field name and field contents.

MAC addresses of the interfaces are stored in VPD as well. Field names
are in the form of 'ethernet_macN', where N is the zero based
interface number.

This patch retrieves the MAC address(es) from the VPD and populates
them in the coreboot table so that they become available to the
bootloader.

BUG=chrome-os-partner:32152, chromium:417117
TEST=with this and other patches in place the storm device tree shows
     up with MAC addresses properly initialized.

Change-Id: I955207b3a644cde100cc4b48e51a2ab9a3cb1ba0
Signed-off-by: Stefan Reinauer <reinauer@chromium.org>
Original-Commit-Id: 1972b9e97b57cc8503c5e4dc496706970ed2ffbe
Original-Change-Id: I12c0d15ca84f60e4824e1056c9be2e81a7ad8e73
Original-Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/219443
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9207
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/src/include/boot/coreboot_tables.h b/src/include/boot/coreboot_tables.h
index 46c1df5e4971..0efb8fdb4187 100644
--- a/src/include/boot/coreboot_tables.h
+++ b/src/include/boot/coreboot_tables.h
@@ -263,6 +263,19 @@ struct lb_board_id {
 	uint32_t board_id;
 };
 
+#define LB_TAG_MAC_ADDRS	0x0026
+struct mac_address {
+	uint8_t mac_addr[6];
+	uint8_t pad[2];		/* Pad it to 8 bytes to keep it simple. */
+};
+
+struct lb_macs {
+	uint32_t tag;
+	uint32_t size;
+	uint32_t count;
+	struct mac_address mac_addrs[0];
+};
+
 /* The following structures are for the cmos definitions table */
 #define LB_TAG_CMOS_OPTION_TABLE 200
 /* cmos header record */