ifdtool.c

/*
 * ifdtool - Manage Intel Firmware Descriptor information
 *
 * Copyright 2014 Google, Inc
 *
 * SPDX-License-Identifier:	GPL-2.0
 *
 * From Coreboot project, but it got a serious code clean-up
 * and a few new features
 */

#include <assert.h>
#include <fcntl.h>
#include <getopt.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <libfdt.h>
#include "ifdtool.h"

#undef DEBUG

#ifdef DEBUG
#define debug(fmt, args...)	printf(fmt, ##args)
#else
#define debug(fmt, args...)
#endif

#define FD_SIGNATURE		0x0FF0A55A
#define FLREG_BASE(reg)		((reg & 0x00000fff) << 12);
#define FLREG_LIMIT(reg)	(((reg & 0x0fff0000) >> 4) | 0xfff);

enum input_file_type_t {
	IF_normal,
	IF_fdt,
	IF_uboot,
};

struct input_file {
	char *fname;
	unsigned int addr;
	enum input_file_type_t type;
};

/**
 * find_fd() - Find the flash description in the ROM image
 *
 * @image:	Pointer to image
 * @size:	Size of image in bytes
 * @return pointer to structure, or NULL if not found
 */
static struct fdbar_t *find_fd(char *image, int size)
{
	uint32_t *ptr, *end;

	/* Scan for FD signature */
	for (ptr = (uint32_t *)image, end = ptr + size / 4; ptr < end; ptr++) {
		if (*ptr == FD_SIGNATURE)
			break;
	}

	if (ptr == end) {
		printf("No Flash Descriptor found in this image\n");
		return NULL;
	}

	debug("Found Flash Descriptor signature at 0x%08lx\n",
	      (char *)ptr - image);

	return (struct fdbar_t *)ptr;
}

/**
 * get_region() - Get information about the selected region
 *
 * @frba:		Flash region list
 * @region_type:	Type of region (0..MAX_REGIONS-1)
 * @region:		Region information is written here
 * @return 0 if OK, else -ve
 */
static int get_region(struct frba_t *frba, int region_type,
		      struct region_t *region)
{
	if (region_type >= MAX_REGIONS) {
		fprintf(stderr, "Invalid region type.\n");
		return -1;
	}

	region->base = FLREG_BASE(frba->flreg[region_type]);
	region->limit = FLREG_LIMIT(frba->flreg[region_type]);
	region->size = region->limit - region->base + 1;

	return 0;
}

static const char *region_name(int region_type)
{
	static const char *const regions[] = {
		"Flash Descriptor",
		"BIOS",
		"Intel ME",
		"GbE",
		"Platform Data"
	};

	assert(region_type < MAX_REGIONS);

	return regions[region_type];
}

static const char *region_filename(int region_type)
{
	static const char *const region_filenames[] = {
		"flashregion_0_flashdescriptor.bin",
		"flashregion_1_bios.bin",
		"flashregion_2_intel_me.bin",
		"flashregion_3_gbe.bin",
		"flashregion_4_platform_data.bin"
	};

	assert(region_type < MAX_REGIONS);

	return region_filenames[region_type];
}

static int dump_region(int num, struct frba_t *frba)
{
	struct region_t region;
	int ret;

	ret = get_region(frba, num, &region);
	if (ret)
		return ret;

	printf("  Flash Region %d (%s): %08x - %08x %s\n",
	       num, region_name(num), region.base, region.limit,
	       region.size < 1 ? "(unused)" : "");

	return ret;
}

static void dump_frba(struct frba_t *frba)
{
	int i;

	printf("Found Region Section\n");
	for (i = 0; i < MAX_REGIONS; i++) {
		printf("FLREG%d:    0x%08x\n", i, frba->flreg[i]);
		dump_region(i, frba);
	}
}

static void decode_spi_frequency(unsigned int freq)
{
	switch (freq) {
	case SPI_FREQUENCY_20MHZ:
		printf("20MHz");
		break;
	case SPI_FREQUENCY_33MHZ:
		printf("33MHz");
		break;
	case SPI_FREQUENCY_50MHZ:
		printf("50MHz");
		break;
	default:
		printf("unknown<%x>MHz", freq);
	}
}

static void decode_component_density(unsigned int density)
{
	switch (density) {
	case COMPONENT_DENSITY_512KB:
		printf("512KiB");
		break;
	case COMPONENT_DENSITY_1MB:
		printf("1MiB");
		break;
	case COMPONENT_DENSITY_2MB:
		printf("2MiB");
		break;
	case COMPONENT_DENSITY_4MB:
		printf("4MiB");
		break;
	case COMPONENT_DENSITY_8MB:
		printf("8MiB");
		break;
	case COMPONENT_DENSITY_16MB:
		printf("16MiB");
		break;
	default:
		printf("unknown<%x>MiB", density);
	}
}

static void dump_fcba(struct fcba_t *fcba)
{
	printf("\nFound Component Section\n");
	printf("FLCOMP     0x%08x\n", fcba->flcomp);
	printf("  Dual Output Fast Read Support:       %ssupported\n",
	       (fcba->flcomp & (1 << 30)) ? "" : "not ");
	printf("  Read ID/Read Status Clock Frequency: ");
	decode_spi_frequency((fcba->flcomp >> 27) & 7);
	printf("\n  Write/Erase Clock Frequency:         ");
	decode_spi_frequency((fcba->flcomp >> 24) & 7);
	printf("\n  Fast Read Clock Frequency:           ");
	decode_spi_frequency((fcba->flcomp >> 21) & 7);
	printf("\n  Fast Read Support:                   %ssupported",
	       (fcba->flcomp & (1 << 20)) ? "" : "not ");
	printf("\n  Read Clock Frequency:                ");
	decode_spi_frequency((fcba->flcomp >> 17) & 7);
	printf("\n  Component 2 Density:                 ");
	decode_component_density((fcba->flcomp >> 3) & 7);
	printf("\n  Component 1 Density:                 ");
	decode_component_density(fcba->flcomp & 7);
	printf("\n");
	printf("FLILL      0x%08x\n", fcba->flill);
	printf("  Invalid Instruction 3: 0x%02x\n",
	       (fcba->flill >> 24) & 0xff);
	printf("  Invalid Instruction 2: 0x%02x\n",
	       (fcba->flill >> 16) & 0xff);
	printf("  Invalid Instruction 1: 0x%02x\n",
	       (fcba->flill >> 8) & 0xff);
	printf("  Invalid Instruction 0: 0x%02x\n",
	       fcba->flill & 0xff);
	printf("FLPB       0x%08x\n", fcba->flpb);
	printf("  Flash Partition Boundary Address: 0x%06x\n\n",
	       (fcba->flpb & 0xfff) << 12);
}

static void dump_fpsba(struct fpsba_t *fpsba)
{
	int i;

	printf("Found PCH Strap Section\n");
	for (i = 0; i < MAX_STRAPS; i++)
		printf("PCHSTRP%-2d:  0x%08x\n", i, fpsba->pchstrp[i]);
}

static const char *get_enabled(int flag)
{
	return flag ? "enabled" : "disabled";
}

static void decode_flmstr(uint32_t flmstr)
{
	printf("  Platform Data Region Write Access: %s\n",
	       get_enabled(flmstr & (1 << 28)));
	printf("  GbE Region Write Access:           %s\n",
	       get_enabled(flmstr & (1 << 27)));
	printf("  Intel ME Region Write Access:      %s\n",
	       get_enabled(flmstr & (1 << 26)));
	printf("  Host CPU/BIOS Region Write Access: %s\n",
	       get_enabled(flmstr & (1 << 25)));
	printf("  Flash Descriptor Write Access:     %s\n",
	       get_enabled(flmstr & (1 << 24)));

	printf("  Platform Data Region Read Access:  %s\n",
	       get_enabled(flmstr & (1 << 20)));
	printf("  GbE Region Read Access:            %s\n",
	       get_enabled(flmstr & (1 << 19)));
	printf("  Intel ME Region Read Access:       %s\n",
	       get_enabled(flmstr & (1 << 18)));
	printf("  Host CPU/BIOS Region Read Access:  %s\n",
	       get_enabled(flmstr & (1 << 17)));
	printf("  Flash Descriptor Read Access:      %s\n",
	       get_enabled(flmstr & (1 << 16)));

	printf("  Requester ID:                      0x%04x\n\n",
	       flmstr & 0xffff);
}

static void dump_fmba(struct fmba_t *fmba)
{
	printf("Found Master Section\n");
	printf("FLMSTR1:   0x%08x (Host CPU/BIOS)\n", fmba->flmstr1);
	decode_flmstr(fmba->flmstr1);
	printf("FLMSTR2:   0x%08x (Intel ME)\n", fmba->flmstr2);
	decode_flmstr(fmba->flmstr2);
	printf("FLMSTR3:   0x%08x (GbE)\n", fmba->flmstr3);
	decode_flmstr(fmba->flmstr3);
}

static void dump_fmsba(struct fmsba_t *fmsba)
{
	int i;

	printf("Found Processor Strap Section\n");
	for (i = 0; i < 4; i++)
		printf("????:      0x%08x\n", fmsba->data[0]);
}

static void dump_jid(uint32_t jid)
{
	printf("    SPI Component Device ID 1:          0x%02x\n",
	       (jid >> 16) & 0xff);
	printf("    SPI Component Device ID 0:          0x%02x\n",
	       (jid >> 8) & 0xff);
	printf("    SPI Component Vendor ID:            0x%02x\n",
	       jid & 0xff);
}

static void dump_vscc(uint32_t vscc)
{
	printf("    Lower Erase Opcode:                 0x%02x\n",
	       vscc >> 24);
	printf("    Lower Write Enable on Write Status: 0x%02x\n",
	       vscc & (1 << 20) ? 0x06 : 0x50);
	printf("    Lower Write Status Required:        %s\n",
	       vscc & (1 << 19) ? "Yes" : "No");
	printf("    Lower Write Granularity:            %d bytes\n",
	       vscc & (1 << 18) ? 64 : 1);
	printf("    Lower Block / Sector Erase Size:    ");
	switch ((vscc >> 16) & 0x3) {
	case 0:
		printf("256 Byte\n");
		break;
	case 1:
		printf("4KB\n");
		break;
	case 2:
		printf("8KB\n");
		break;
	case 3:
		printf("64KB\n");
		break;
	}

	printf("    Upper Erase Opcode:                 0x%02x\n",
	       (vscc >> 8) & 0xff);
	printf("    Upper Write Enable on Write Status: 0x%02x\n",
	       vscc & (1 << 4) ? 0x06 : 0x50);
	printf("    Upper Write Status Required:        %s\n",
	       vscc & (1 << 3) ? "Yes" : "No");
	printf("    Upper Write Granularity:            %d bytes\n",
	       vscc & (1 << 2) ? 64 : 1);
	printf("    Upper Block / Sector Erase Size:    ");
	switch (vscc & 0x3) {
	case 0:
		printf("256 Byte\n");
		break;
	case 1:
		printf("4KB\n");
		break;
	case 2:
		printf("8KB\n");
		break;
	case 3:
		printf("64KB\n");
		break;
	}
}

static void dump_vtba(struct vtba_t *vtba, int vtl)
{
	int i;
	int num = (vtl >> 1) < 8 ? (vtl >> 1) : 8;

	printf("ME VSCC table:\n");
	for (i = 0; i < num; i++) {
		printf("  JID%d:  0x%08x\n", i, vtba->entry[i].jid);
		dump_jid(vtba->entry[i].jid);
		printf("  VSCC%d: 0x%08x\n", i, vtba->entry[i].vscc);
		dump_vscc(vtba->entry[i].vscc);
	}
	printf("\n");
}

static void dump_oem(uint8_t *oem)
{
	int i, j;
	printf("OEM Section:\n");
	for (i = 0; i < 4; i++) {
		printf("%02x:", i << 4);
		for (j = 0; j < 16; j++)
			printf(" %02x", oem[(i<<4)+j]);
		printf("\n");
	}
	printf("\n");
}

/**
 * dump_fd() - Display a dump of the full flash description
 *
 * @image:	Pointer to image
 * @size:	Size of image in bytes
 * @return 0 if OK, -1 on error
 */
static int dump_fd(char *image, int size)
{
	struct fdbar_t *fdb = find_fd(image, size);

	if (!fdb)
		return -1;

	printf("FLMAP0:    0x%08x\n", fdb->flmap0);
	printf("  NR:      %d\n", (fdb->flmap0 >> 24) & 7);
	printf("  FRBA:    0x%x\n", ((fdb->flmap0 >> 16) & 0xff) << 4);
	printf("  NC:      %d\n", ((fdb->flmap0 >> 8) & 3) + 1);
	printf("  FCBA:    0x%x\n", ((fdb->flmap0) & 0xff) << 4);

	printf("FLMAP1:    0x%08x\n", fdb->flmap1);
	printf("  ISL:     0x%02x\n", (fdb->flmap1 >> 24) & 0xff);
	printf("  FPSBA:   0x%x\n", ((fdb->flmap1 >> 16) & 0xff) << 4);
	printf("  NM:      %d\n", (fdb->flmap1 >> 8) & 3);
	printf("  FMBA:    0x%x\n", ((fdb->flmap1) & 0xff) << 4);

	printf("FLMAP2:    0x%08x\n", fdb->flmap2);
	printf("  PSL:     0x%04x\n", (fdb->flmap2 >> 8) & 0xffff);
	printf("  FMSBA:   0x%x\n", ((fdb->flmap2) & 0xff) << 4);

	printf("FLUMAP1:   0x%08x\n", fdb->flumap1);
	printf("  Intel ME VSCC Table Length (VTL):        %d\n",
	       (fdb->flumap1 >> 8) & 0xff);
	printf("  Intel ME VSCC Table Base Address (VTBA): 0x%06x\n\n",
	       (fdb->flumap1 & 0xff) << 4);
	dump_vtba((struct vtba_t *)
			(image + ((fdb->flumap1 & 0xff) << 4)),
			(fdb->flumap1 >> 8) & 0xff);
	dump_oem((uint8_t *)image + 0xf00);
	dump_frba((struct frba_t *)(image + (((fdb->flmap0 >> 16) & 0xff)
			<< 4)));
	dump_fcba((struct fcba_t *)(image + (((fdb->flmap0) & 0xff) << 4)));
	dump_fpsba((struct fpsba_t *)
			(image + (((fdb->flmap1 >> 16) & 0xff) << 4)));
	dump_fmba((struct fmba_t *)(image + (((fdb->flmap1) & 0xff) << 4)));
	dump_fmsba((struct fmsba_t *)(image + (((fdb->flmap2) & 0xff) << 4)));

	return 0;
}

/**
 * write_regions() - Write each region from an image to its own file
 *
 * The filename to use in each case is fixed - see region_filename()
 *
 * @image:	Pointer to image
 * @size:	Size of image in bytes
 * @return 0 if OK, -ve on error
 */
static int write_regions(char *image, int size)
{
	struct fdbar_t *fdb;
	struct frba_t *frba;
	int ret = 0;
	int i;

	fdb =  find_fd(image, size);
	if (!fdb)
		return -1;

	frba = (struct frba_t *)(image + (((fdb->flmap0 >> 16) & 0xff) << 4));

	for (i = 0; i < MAX_REGIONS; i++) {
		struct region_t region;
		int region_fd;

		ret = get_region(frba, i, &region);
		if (ret)
			return ret;
		dump_region(i, frba);
		if (region.size <= 0)
			continue;
		region_fd = open(region_filename(i),
				 O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR |
				 S_IWUSR | S_IRGRP | S_IROTH);
		if (write(region_fd, image + region.base, region.size) !=
				region.size) {
			perror("Error while writing");
			ret = -1;
		}
		close(region_fd);
	}

	return ret;
}

static int perror_fname(const char *fmt, const char *fname)
{
	char msg[strlen(fmt) + strlen(fname) + 1];

	sprintf(msg, fmt, fname);
	perror(msg);

	return -1;
}

/**
 * write_image() - Write the image to a file
 *
 * @filename:	Filename to use for the image
 * @image:	Pointer to image
 * @size:	Size of image in bytes
 * @return 0 if OK, -ve on error
 */
static int write_image(char *filename, char *image, int size)
{
	int new_fd;

	debug("Writing new image to %s\n", filename);

	new_fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR |
		      S_IWUSR | S_IRGRP | S_IROTH);
	if (new_fd < 0)
		return perror_fname("Could not open file '%s'", filename);
	if (write(new_fd, image, size) != size)
		return perror_fname("Could not write file '%s'", filename);
	close(new_fd);

	return 0;
}

/**
 * set_spi_frequency() - Set the SPI frequency to use when booting
 *
 * Several frequencies are supported, some of which work with fast devices.
 * For SPI emulators, the slowest (SPI_FREQUENCY_20MHZ) is often used. The
 * Intel boot system uses this information somehow on boot.
 *
 * The image is updated with the supplied value
 *
 * @image:	Pointer to image
 * @size:	Size of image in bytes
 * @freq:	SPI frequency to use
 */
static void set_spi_frequency(char *image, int size, enum spi_frequency freq)
{
	struct fdbar_t *fdb = find_fd(image, size);
	struct fcba_t *fcba;

	fcba = (struct fcba_t *)(image + (((fdb->flmap0) & 0xff) << 4));

	/* clear bits 21-29 */
	fcba->flcomp &= ~0x3fe00000;
	/* Read ID and Read Status Clock Frequency */
	fcba->flcomp |= freq << 27;
	/* Write and Erase Clock Frequency */
	fcba->flcomp |= freq << 24;
	/* Fast Read Clock Frequency */
	fcba->flcomp |= freq << 21;
}

/**
 * set_em100_mode() - Set a SPI frequency that will work with Dediprog EM100
 *
 * @image:	Pointer to image
 * @size:	Size of image in bytes
 */
static void set_em100_mode(char *image, int size)
{
	struct fdbar_t *fdb = find_fd(image, size);
	struct fcba_t *fcba;

	fcba = (struct fcba_t *)(image + (((fdb->flmap0) & 0xff) << 4));
	fcba->flcomp &= ~(1 << 30);
	set_spi_frequency(image, size, SPI_FREQUENCY_20MHZ);
}

/**
 * lock_descriptor() - Lock the NE descriptor so it cannot be updated
 *
 * @image:	Pointer to image
 * @size:	Size of image in bytes
 */
static void lock_descriptor(char *image, int size)
{
	struct fdbar_t *fdb = find_fd(image, size);
	struct fmba_t *fmba;

	/*
	 * TODO: Dynamically take Platform Data Region and GbE Region into
	 * account.
	 */
	fmba = (struct fmba_t *)(image + (((fdb->flmap1) & 0xff) << 4));
	fmba->flmstr1 = 0x0a0b0000;
	fmba->flmstr2 = 0x0c0d0000;
	fmba->flmstr3 = 0x08080118;
}

/**
 * unlock_descriptor() - Lock the NE descriptor so it can be updated
 *
 * @image:	Pointer to image
 * @size:	Size of image in bytes
 */
static void unlock_descriptor(char *image, int size)
{
	struct fdbar_t *fdb = find_fd(image, size);
	struct fmba_t *fmba;

	fmba = (struct fmba_t *)(image + (((fdb->flmap1) & 0xff) << 4));
	fmba->flmstr1 = 0xffff0000;
	fmba->flmstr2 = 0xffff0000;
	fmba->flmstr3 = 0x08080118;
}

/**
 * open_for_read() - Open a file for reading
 *
 * @fname:	Filename to open
 * @sizep:	Returns file size in bytes
 * @return 0 if OK, -1 on error
 */
int open_for_read(const char *fname, int *sizep)
{
	int fd = open(fname, O_RDONLY);
	struct stat buf;

	if (fd == -1)
		return perror_fname("Could not open file '%s'", fname);
	if (fstat(fd, &buf) == -1)
		return perror_fname("Could not stat file '%s'", fname);
	*sizep = buf.st_size;
	debug("File %s is %d bytes\n", fname, *sizep);

	return fd;
}

/**
 * inject_region() - Add a file to an image region
 *
 * This puts a file into a particular region of the flash. Several pre-defined
 * regions are used.
 *
 * @image:		Pointer to image
 * @size:		Size of image in bytes
 * @region_type:	Region where the file should be added
 * @region_fname:	Filename to add to the image
 * @return 0 if OK, -ve on error
 */
int inject_region(char *image, int size, int region_type, char *region_fname)
{
	struct fdbar_t *fdb = find_fd(image, size);
	struct region_t region;
	struct frba_t *frba;
	int region_size;
	int offset = 0;
	int region_fd;
	int ret;

	if (!fdb)
		exit(EXIT_FAILURE);
	frba = (struct frba_t *)(image + (((fdb->flmap0 >> 16) & 0xff) << 4));

	ret = get_region(frba, region_type, &region);
	if (ret)
		return -1;
	if (region.size <= 0xfff) {
		fprintf(stderr, "Region %s is disabled in target. Not injecting.\n",
			region_name(region_type));
		return -1;
	}

	region_fd = open_for_read(region_fname, &region_size);
	if (region_fd < 0)
		return region_fd;

	if ((region_size > region.size) ||
	    ((region_type != 1) && (region_size > region.size))) {
		fprintf(stderr, "Region %s is %d(0x%x) bytes. File is %d(0x%x)  bytes. Not injecting.\n",
			region_name(region_type), region.size,
			region.size, region_size, region_size);
		return -1;
	}

	if ((region_type == 1) && (region_size < region.size)) {
		fprintf(stderr, "Region %s is %d(0x%x) bytes. File is %d(0x%x) bytes. Padding before injecting.\n",
			region_name(region_type), region.size,
			region.size, region_size, region_size);
		offset = region.size - region_size;
		memset(image + region.base, 0xff, offset);
	}

	if (size < region.base + offset + region_size) {
		fprintf(stderr, "Output file is too small. (%d < %d)\n",
			size, region.base + offset + region_size);
		return -1;
	}

	if (read(region_fd, image + region.base + offset, region_size)
							!= region_size) {
		perror("Could not read file");
		return -1;
	}

	close(region_fd);

	debug("Adding %s as the %s section\n", region_fname,
	      region_name(region_type));

	return 0;
}

/**
 * write_data() - Write some raw data into a region
 *
 * This puts a file into a particular place in the flash, ignoring the
 * regions. Be careful not to overwrite something important.
 *
 * @image:		Pointer to image
 * @size:		Size of image in bytes
 * @addr:		x86 ROM address to put file. The ROM ends at
 *			0xffffffff so use an address relative to that. For an
 *			8MB ROM the start address is 0xfff80000.
 * @write_fname:	Filename to add to the image
 * @offset_uboot_top:	Offset of the top of U-Boot
 * @offset_uboot_start:	Offset of the start of U-Boot
 * @return number of bytes written if OK, -ve on error
 */
static int write_data(char *image, int size, unsigned int addr,
		      const char *write_fname, int offset_uboot_top,
		      int offset_uboot_start)
{
	int write_fd, write_size;
	int offset;

	write_fd = open_for_read(write_fname, &write_size);
	if (write_fd < 0)
		return write_fd;

	offset = (uint32_t)(addr + size);
	if (offset_uboot_top) {
		if (offset_uboot_start < offset &&
		    offset_uboot_top >= offset) {
			fprintf(stderr, "U-Boot image overlaps with region '%s'\n",
				write_fname);
			fprintf(stderr,
				"U-Boot finishes at offset %x, file starts at %x\n",
				offset_uboot_top, offset);
			return -EXDEV;
		}
		if (offset_uboot_start > offset &&
		    offset_uboot_start <= offset + write_size) {
			fprintf(stderr, "U-Boot image overlaps with region '%s'\n",
				write_fname);
			fprintf(stderr,
				"U-Boot starts at offset %x, file finishes at %x\n",
				offset_uboot_start, offset + write_size);
			return -EXDEV;
		}
	}
	debug("Writing %s to offset %#x\n", write_fname, offset);

	if (offset < 0 || offset + write_size > size) {
		fprintf(stderr, "Output file is too small. (%d < %d)\n",
			size, offset + write_size);
		return -1;
	}

	if (read(write_fd, image + offset, write_size) != write_size) {
		perror("Could not read file");
		return -1;
	}

	close(write_fd);

	return write_size;
}

static int scan_ucode(const void *blob, char *ucode_base, int *countp,
		      const char **datap, int *data_sizep)
{
	const char *data = NULL;
	int node, count;
	int data_size;
	char *ucode;

	for (node = 0, count = 0, ucode = ucode_base; node >= 0; count++) {
		node = fdt_node_offset_by_compatible(blob, node,
						     "intel,microcode");
		if (node < 0)
			break;

		data = fdt_getprop(blob, node, "data", &data_size);
		if (!data) {
			debug("Missing microcode data in FDT '%s': %s\n",
			      fdt_get_name(blob, node, NULL),
			      fdt_strerror(data_size));
			return -ENOENT;
		}

		if (ucode_base)
			memcpy(ucode, data, data_size);
		ucode += data_size;
	}

	if (countp)
		*countp = count;
	if (datap)
		*datap = data;
	if (data_sizep)
		*data_sizep = data_size;

	return ucode - ucode_base;
}

static int remove_ucode(char *blob)
{
	int node, count;
	int ret;

	/* Keep going until we find no more microcode to remove */
	do {
		for (node = 0, count = 0; node >= 0;) {
			int ret;

			node = fdt_node_offset_by_compatible(blob, node,
							     "intel,microcode");
			if (node < 0)
				break;

			ret = fdt_delprop(blob, node, "data");

			/*
			 * -FDT_ERR_NOTFOUND means we already removed the
			 * data for this one, so we just continue.
			 * 0 means we did remove it, so offsets may have
			 * changed and we need to restart our scan.
			 * Anything else indicates an error we should report.
			 */
			if (ret == -FDT_ERR_NOTFOUND)
				continue;
			else if (!ret)
				node = 0;
			else
				return ret;
		}
	} while (count);

	/* Pack down to remove excees space */
	ret = fdt_pack(blob);
	if (ret)
		return ret;

	return fdt_totalsize(blob);
}

static int write_ucode(char *image, int size, struct input_file *fdt,
		       int fdt_size, unsigned int ucode_ptr,
		       int collate_ucode)
{
	const char *data = NULL;
	char *ucode_buf;
	const void *blob;
	char *ucode_base;
	uint32_t *ptr;
	int ucode_size;
	int data_size;
	int offset;
	int count;
	int ret;

	blob = (void *)image + (uint32_t)(fdt->addr + size);

	debug("DTB at %lx\n", (char *)blob - image);

	/* Find out about the micrcode we have */
	ucode_size = scan_ucode(blob, NULL, &count, &data, &data_size);
	if (ucode_size < 0)
		return ucode_size;
	if (!count) {
		debug("No microcode found in FDT\n");
		return -ENOENT;
	}

	if (count > 1 && !collate_ucode) {
		fprintf(stderr,
			"Cannot handle multiple microcode blocks - please use -C flag to collate them\n");
		return -EMLINK;
	}

	/*
	 * Collect the microcode into a buffer, remove it from the device
	 * tree and place it immediately above the (now smaller) device tree.
	 */
	if (collate_ucode && count > 1) {
		ucode_buf = malloc(ucode_size);
		if (!ucode_buf) {
			fprintf(stderr,
				"Out of memory for microcode (%d bytes)\n",
				ucode_size);
			return -ENOMEM;
		}
		ret = scan_ucode(blob, ucode_buf, NULL, NULL, NULL);
		if (ret < 0)
			return ret;

		/* Remove the microcode from the device tree */
		ret = remove_ucode((char *)blob);
		if (ret < 0) {
			debug("Could not remove FDT microcode: %s\n",
			      fdt_strerror(ret));
			return -EINVAL;
		}
		debug("Collated %d microcode block(s)\n", count);
		debug("Device tree reduced from %x to %x bytes\n",
		      fdt_size, ret);
		fdt_size = ret;

		/*
		 * Place microcode area immediately above the FDT, aligned
		 * to a 16-byte boundary.
		 */
		ucode_base = (char *)(((unsigned long)blob + fdt_size + 15) &
				~15);

		data = ucode_base;
		data_size = ucode_size;
		memcpy(ucode_base, ucode_buf, ucode_size);
		free(ucode_buf);
	}

	offset = (uint32_t)(ucode_ptr + size);
	ptr = (void *)image + offset;

	ptr[0] = (data - image) - size;
	ptr[1] = data_size;
	debug("Wrote microcode pointer at %x: addr=%x, size=%x\n", ucode_ptr,
	      ptr[0], ptr[1]);

	return (collate_ucode ? data + data_size : (char *)blob + fdt_size) -
			image;
}

/**
 * write_uboot() - Write U-Boot, device tree and microcode pointer
 *
 * This writes U-Boot into a place in the flash, followed by its device tree.
 * The microcode pointer is written so that U-Boot can find the microcode in
 * the device tree very early in boot.
 *
 * @image:	Pointer to image
 * @size:	Size of image in bytes
 * @uboot:	Input file information for u-boot.bin
 * @fdt:	Input file information for u-boot.dtb
 * @ucode_ptr:	Address in U-Boot where the microcode pointer should be placed
 * @return 0 if OK, -ve on error
 */
static int write_uboot(char *image, int size, struct input_file *uboot,
		       struct input_file *fdt, unsigned int ucode_ptr,
		       int collate_ucode, int *offset_uboot_top,
		       int *offset_uboot_start)
{
	int uboot_size, fdt_size;
	int uboot_top;

	uboot_size = write_data(image, size, uboot->addr, uboot->fname, 0, 0);
	if (uboot_size < 0)
		return uboot_size;
	fdt->addr = uboot->addr + uboot_size;
	debug("U-Boot size %#x, FDT at %#x\n", uboot_size, fdt->addr);
	fdt_size = write_data(image, size, fdt->addr, fdt->fname, 0, 0);
	if (fdt_size < 0)
		return fdt_size;

	uboot_top = (uint32_t)(fdt->addr + size) + fdt_size;

	if (ucode_ptr) {
		uboot_top = write_ucode(image, size, fdt, fdt_size, ucode_ptr,
					collate_ucode);
		if (uboot_top < 0)
			return uboot_top;
	}

	if (offset_uboot_top && offset_uboot_start) {
		*offset_uboot_top = uboot_top;
		*offset_uboot_start = (uint32_t)(uboot->addr + size);
	}

	return 0;
}

static void print_version(void)
{
	printf("ifdtool v%s -- ", IFDTOOL_VERSION);
	printf("Copyright (C) 2014 Google Inc.\n\n");
	printf("SPDX-License-Identifier:	GPL-2.0+\n");
}

static void print_usage(const char *name)
{
	printf("usage: %s [-vhdix?] <filename> [<outfile>]\n", name);
	printf("\n"
	       "   -d | --dump:                      dump intel firmware descriptor\n"
	       "   -x | --extract:                   extract intel fd modules\n"
	       "   -i | --inject <region>:<module>   inject file <module> into region <region>\n"
	       "   -w | --write <addr>:<file>        write file to appear at memory address <addr>\n"
	       "                                     multiple files can be written simultaneously\n"
	       "   -s | --spifreq <20|33|50>         set the SPI frequency\n"
	       "   -e | --em100                      set SPI frequency to 20MHz and disable\n"
	       "                                     Dual Output Fast Read Support\n"
	       "   -l | --lock                       Lock firmware descriptor and ME region\n"
	       "   -u | --unlock                     Unlock firmware descriptor and ME region\n"
	       "   -r | --romsize                    Specify ROM size\n"
	       "   -D | --write-descriptor <file>    Write descriptor at base\n"
	       "   -c | --create                     Create a new empty image\n"
	       "   -v | --version:                   print the version\n"