x86: Add ifdtool for working with Intel Flash Descriptor ROM images

Newer Intel chips require a Management Engine which requires a particular
format for the SPI flash that contains the boot loader. Add a tool that
supports creating and modifying these ROM images.

This tool is from Chrome OS but has been cleaned up to use U-Boot style
and to add comments. A few features have been added also.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/Makefile

@@ -126,6 +126,8 @@ hostprogs-$(CONFIG_EXYNOS5250) += mkexynosspl
 hostprogs-$(CONFIG_EXYNOS5420) += mkexynosspl
 HOSTCFLAGS_mkexynosspl.o := -pedantic
 
+hostprogs-$(CONFIG_X86) += ifdtool
+
 hostprogs-$(CONFIG_MX23) += mxsboot
 hostprogs-$(CONFIG_MX28) += mxsboot
 HOSTCFLAGS_mxsboot.o := -pedantic

tools/ifdtool.h

@@ -0,0 +1,88 @@
+/*
+ * ifdtool - Manage Intel Firmware Descriptor information
+ *
+ * Copyright (C) 2011 The ChromiumOS Authors.
+ *
+ * SPDX-License-Identifier:	GPL-2.0
+ *
+ * From Coreboot project
+ */
+
+#include <stdint.h>
+
+#define __packed	__attribute__((packed))
+
+#define IFDTOOL_VERSION "1.1-U-Boot"
+
+enum spi_frequency {
+	SPI_FREQUENCY_20MHZ = 0,
+	SPI_FREQUENCY_33MHZ = 1,
+	SPI_FREQUENCY_50MHZ = 4,
+};
+
+enum component_density {
+	COMPONENT_DENSITY_512KB = 0,
+	COMPONENT_DENSITY_1MB   = 1,
+	COMPONENT_DENSITY_2MB   = 2,
+	COMPONENT_DENSITY_4MB   = 3,
+	COMPONENT_DENSITY_8MB   = 4,
+	COMPONENT_DENSITY_16MB  = 5,
+};
+
+/* flash descriptor */
+struct __packed fdbar_t {
+	uint32_t flvalsig;
+	uint32_t flmap0;
+	uint32_t flmap1;
+	uint32_t flmap2;
+	uint8_t  reserved[0xefc - 0x20];
+	uint32_t flumap1;
+};
+
+#define MAX_REGIONS	5
+
+/* regions */
+struct __packed frba_t {
+	uint32_t flreg[MAX_REGIONS];
+};
+
+/* component section */
+struct __packed fcba_t {
+	uint32_t flcomp;
+	uint32_t flill;
+	uint32_t flpb;
+};
+
+#define MAX_STRAPS	18
+
+/* pch strap */
+struct __packed fpsba_t {
+	uint32_t pchstrp[MAX_STRAPS];
+};
+
+/* master */
+struct __packed fmba_t {
+	uint32_t flmstr1;
+	uint32_t flmstr2;
+	uint32_t flmstr3;
+};
+
+/* processor strap */
+struct __packed fmsba_t {
+	uint32_t data[8];
+};
+
+/* ME VSCC */
+struct vscc_t {
+	uint32_t jid;
+	uint32_t vscc;
+};
+
+struct vtba_t {
+	/* Actual number of entries specified in vtl */
+	struct vscc_t entry[8];
+};
+
+struct region_t {
+	int base, limit, size;
+};