Add x86_64 architecture support

This is required for U-Boot's sandbox test system.

BUG=chromium-os:16808
TEST=emerge vboot_reference-firmware for tegra2-seaboard, x86-mario

Change-Id: I18b48b069dc56f9b2c826de99780dfff1e544ded
Reviewed-on: https://gerrit.chromium.org/gerrit/5980
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Simon Glass <sjg@chromium.org>

Makefile

@@ -38,6 +38,10 @@ CFLAGS ?= \
 	-mpreferred-stack-boundary=2 -mregparm=3 \
 	$(COMMON_FLAGS)
 endif
+ifeq ($(FIRMWARE_ARCH), x86_64)
+CFLAGS ?= $(COMMON_FLAGS) \
+	-fvisibility=hidden -fno-strict-aliasing -fomit-frame-pointer
+endif
 
 CC ?= gcc
 CXX ?= g++

firmware/arch/x86_64/include/biosincludes.h

@@ -0,0 +1,46 @@
+/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ * X86 firmware platform-specific definitions
+ */
+
+#ifndef __ARCH_X86_BIOSINCLUDES_H__
+#define __ARCH_X86_BIOSINCLUDES_H__
+
+typedef unsigned char uint8_t;
+typedef unsigned short int uint16_t;
+typedef unsigned int uint32_t;
+typedef unsigned long long uint64_t;
+typedef signed long long int64_t;
+typedef unsigned long size_t;
+
+#ifndef NULL
+#define NULL ((void*) 0)
+#endif
+
+#define UINT32_C(x) ((uint32_t) x)
+#define UINT64_C(x) ((uint64_t) x)
+#define PRIu64 "llu"
+extern void debug(const char *format, ...);
+
+#define POSSIBLY_UNUSED __attribute__((unused))
+
+#ifdef __STRICT_ANSI__
+#define INLINE
+#else
+#define INLINE inline
+#endif
+
+#define UINT64_RSHIFT(v, shiftby) (((uint64_t)(v)) >> (shiftby))
+#define UINT64_MULT32(v, multby)  (((uint64_t)(v)) * ((uint32_t)(multby)))
+
+#ifndef UINT32_MAX
+#define UINT32_MAX (UINT32_C(0xffffffffU))
+#endif
+
+#ifndef UINT64_MAX
+#define UINT64_MAX (UINT64_C(0xffffffffffffffffULL))
+#endif
+
+#endif /*__ARCH_X86_BIOSINCLUDES_H__ */