Add microcode blob processing

When microcode storage in CBFS is enabled, the make system is supposed
to generate the microcode blob and place it into the generated ROM
image as a CBFS component.

The microcode source representation does not change: it is still an
array of 32 bit constants. This new addition compiles the array into a
separate object file and then strips all sections but data.

The raw data section is then included into CBFS as a file named
'microcode_blob.bin' of type 0x53, which is assigned to microcode
storage.

Change-Id: I84ae040be52f520b106e3471c7e391e64d7847d9
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: http://review.coreboot.org/1295
Tested-by: build bot (Jenkins)

src/arch/x86/Makefile.inc

@@ -34,6 +34,12 @@ cmos_layout.bin-type = 0x01aa
 OPTION_TABLE_H:=$(obj)/option_table.h
 endif
 
+ifeq ($(CONFIG_MICROCODE_IN_CBFS),y)
+cbfs-files-y += microcode_blob.bin
+microcode_blob.bin-file = $(obj)/microcode_blob.bin
+microcode_blob.bin-type = 0x53
+endif
+
 #######################################################################
 # Build the final rom image
 COREBOOT_ROM_DEPENDENCIES:=

src/cpu/intel/microcode/Makefile.inc

@@ -1 +1,15 @@
 ramstage-y += microcode.c
+
+
+ifeq ($(CONFIG_MICROCODE_IN_CBFS),y)
+
+SRC_PATH = src/cpu/intel/microcode
+FLAGS = -I $(CONFIG_MICROCODE_INCLUDE_PATH) -include $(obj)/config.h
+$(obj)/microcode_blob.o: $(SRC_PATH)/microcode_blob.c
+	$(CC) $(FLAGS) -MMD -c -o $@ $<
+
+$(obj)/microcode_blob.bin: $(obj)/microcode_blob.o
+	objcopy -j .data -O binary $< $@
+
+-include $(obj)/microcode_blob.d
+endif

src/cpu/intel/microcode/microcode_blob.c

@@ -0,0 +1,22 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2012 The ChromiumOS Authors.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+unsigned microcode[] = {
+#include <microcode_blob.h>
+};