Add code to read Intel microcode from CBFS

When CONFIG_MICROCODE_IN_CBFS is enabled, find the microcode blob in
CBFS and pass it to intel_update_microcode() instead of using the
compiled in array.

CBFS accesses in pre-RAM and 'normal' environments are provided
through different API.

Change-Id: I35c1480edf87e550a7b88c4aadf079cf3ff86b5d
Signed-off-by: Vadim Bendebury <vbendeb@chromium.org>
Reviewed-on: http://review.coreboot.org/1296
Tested-by: build bot (Jenkins)

src/cpu/intel/microcode/microcode.c

@@ -1,6 +1,7 @@
 /*
  * This file is part of the coreboot project.
  *
+ * Copyright (C) 2012 The ChromiumOS Authors.  All rights reserved.
  * Copyright (C) 2000 Ronald G. Minnich
  *
  * This program is free software; you can redistribute it and/or modify
@@ -27,6 +28,14 @@
 #include <cpu/x86/msr.h>
 #include <cpu/intel/microcode.h>
 
+#if CONFIG_MICROCODE_IN_CBFS
+#ifdef __PRE_RAM__
+#include <arch/cbfs.h>
+#else
+#include <cbfs.h>
+#endif
+#endif
+
 struct microcode {
 	u32 hdrver;	/* Header Version */
 	u32 rev;	/* Update Revision */
@@ -68,6 +77,9 @@ static inline u32 read_microcode_rev(void)
 	return msr.hi;
 }
 
+#if CONFIG_MICROCODE_IN_CBFS
+static
+#endif
 void intel_update_microcode(const void *microcode_updates)
 {
 	u32 eax;
@@ -131,3 +143,21 @@ void intel_update_microcode(const void *microcode_updates)
 		}
 	}
 }
+
+#if CONFIG_MICROCODE_IN_CBFS
+
+#define MICROCODE_CBFS_FILE "microcode_blob.bin"
+
+void intel_update_microcode_from_cbfs(void)
+{
+	void *microcode_blob;
+
+#ifdef __PRE_RAM__
+	microcode_blob = walkcbfs((char *) MICROCODE_CBFS_FILE);
+#else
+	microcode_blob = cbfs_find_file(MICROCODE_CBFS_FILE,
+					CBFS_TYPE_MICROCODE);
+#endif
+	intel_update_microcode(microcode_blob);
+}
+#endif

src/cpu/intel/model_206ax/bootblock.c

@@ -23,9 +23,11 @@
 #include <cpu/x86/msr.h>
 #include <cpu/x86/mtrr.h>
 
+#if !CONFIG_MICROCODE_IN_CBFS
 static const uint32_t microcode_updates[] = {
 	#include "microcode_blob.h"
 };
+#endif
 
 #include <cpu/intel/microcode/microcode.c>
 
@@ -61,5 +63,9 @@ static void enable_rom_caching(void)
 static void bootblock_cpu_init(void)
 {
 	enable_rom_caching();
+#if CONFIG_MICROCODE_IN_CBFS
+	intel_update_microcode_from_cbfs();
+#else
 	intel_update_microcode(microcode_updates);
+#endif
 }

src/cpu/intel/model_206ax/model_206ax_init.c

@@ -115,9 +115,11 @@ static acpi_cstate_t cstate_map[] = {
 	{ 0 }
 };
 
+#if !CONFIG_MICROCODE_IN_CBFS
 static const uint32_t microcode_updates[] = {
 	#include "microcode_blob.h"
 };
+#endif
 
 /* Convert time in seconds to POWER_LIMIT_1_TIME MSR value */
 static const u8 power_limit_time_sec_to_msr[] = {
@@ -387,8 +389,11 @@ static void model_206ax_init(device_t cpu)
 	/* Turn on caching if we haven't already */
 	x86_enable_cache();
 
-	/* Update the microcode */
+#if CONFIG_MICROCODE_IN_CBFS
+	intel_update_microcode_from_cbfs();
+#else
 	intel_update_microcode(microcode_updates);
+#endif
 
 	/* Clear out pending MCEs */
 	configure_mca();

src/include/cpu/intel/microcode.h

@@ -1,6 +1,7 @@
 /*
  * This file is part of the coreboot project.
  *
+ * Copyright (C) 2012 The ChromiumOS Authors.  All rights reserved.
  * Copyright (C) 2000 Ronald G. Minnich
  *
  * This program is free software; you can redistribute it and/or modify
@@ -16,7 +17,15 @@
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  */
+#ifndef __CPU__INTEL__MICROCODE__
+#define __CPU__INTEL__MICROCODE__
 
-#if !defined(__ROMCC__)
+#ifndef __PRE_RAM__
+#if CONFIG_MICROCODE_IN_CBFS
+void intel_update_microcode_from_cbfs(void);
+#else
 void intel_update_microcode(const void *microcode_updates);
 #endif
+#endif
+
+#endif