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/*-
* Copyright (c) 2013 John Clark <clarkjc@runbox.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* $FreeBSD$ */
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/endian.h>
#include <unistd.h>
#define BUFFER_SIZE 4096
static void error(const char *fmt, ...);
static void process_amd(const char *container, const char *outdir);
static void process_intel(const char *filename, const char *outdir);
/*
* This tool extracts microcode from container files provided by
* Intel and AMD for their families of popular microprocessors.
*/
int
main(int argc, char *argv[])
{
int ch, i, mode = -1;
char *outdir = ".";
/* Parse the command line arguments. */
while ((ch = getopt(argc, argv, "aio:")) != -1) {
switch (ch) {
case 'a': /* Mode select */
case 'i':
mode = ch;
break;
case 'o': /* Output directory */
outdir = optarg;
break;
default: /* Unknown */
error("Error: Invalid argument\n");
}
}
if (mode == 'i') {
/* Process Intel microcode container files */
for (i = optind; i < argc; i++) {
process_intel(argv[i], outdir);
}
} else if (mode == 'a') {
/* Process AMD microcode container files */
for (i = optind; i < argc; i++) {
process_amd(argv[i], outdir);
}
} else {
error("Error: Invalid mode\n");
}
return 0;
}
/* Display an error message and exit with a status code of 1. */
static void
error(const char *fmt, ...)
{
va_list args;
if (fmt == NULL) {
perror("Error");
} else {
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
}
exit(1);
}
/* Process an AMD supplied microcode container file. */
#define AMD_HEADER_LEN 12
#define AMD_SKIP_OFFSET 8
#define AMD_UCODE_HEADER_LEN 8
#define AMD_UCODE_HEADER_TYPE 0x00000001
#define AMD_UCODE_ID_OFFSET 4
#define AMD_UCODE_SIG_OFFSET 24
static void
process_amd(const char *container, const char *outdir)
{
char outname[FILENAME_MAX];
const uint8_t magic[] = {
0x44, 0x4d, 0x41, 0x00, 0x00, 0x00, 0x00, 0x00
};
FILE *fin, *fout;
uint8_t *buf;
uint32_t id, len, sig;
int num;
if ((buf = malloc(BUFFER_SIZE)) == NULL)
error(NULL);
/* Open the container file and read the header. */
if ((fin = fopen(container, "rb")) == NULL)
error(NULL);
if (fread(buf, AMD_HEADER_LEN, 1, fin) != 1) {
error("Error: Truncated file: %s\n", container);
}
/* Check the magic numbers. */
if (memcmp(magic, buf, sizeof(magic)) != 0) {
error("Error: Invalid file: %s\n", container);
}
/* Seek to the first microcode image. */
if (fseek(fin, le32dec(buf + AMD_SKIP_OFFSET), SEEK_CUR) != 0)
error(NULL);
/* Read all microcode images. */
while ((num = fread(buf, 1, AMD_UCODE_HEADER_LEN, fin)) != 0) {
/* Read and validate the image. */
if (num != AMD_UCODE_HEADER_LEN) {
error("Error: Truncated file: %s\n", container);
}
if (le32dec(buf) != AMD_UCODE_HEADER_TYPE) {
error("Error: Invalid type: %s\n", container);
}
len = le32dec(buf + sizeof(uint32_t));
if (len > BUFFER_SIZE) {
if ((buf = realloc(buf, len)) == NULL)
error(NULL);
}
if (fread(buf, len, 1, fin) != 1) {
error("Error: Truncated file: %s\n", container);
}
/* Write the image to an output file. */
sig = le32dec(buf + AMD_UCODE_SIG_OFFSET);
id = le32dec(buf + AMD_UCODE_ID_OFFSET);
snprintf(outname, sizeof(outname), "%s/AMD-%08x-%08x.fw",
outdir, sig, id);
if ((fout = fopen(outname, "wb")) == NULL)
error(NULL);
if (fwrite(buf, len, 1, fout) != 1)
error(NULL);
if (fclose(fout) != 0)
error(NULL);
}
if (fclose(fin) != 0)
error(NULL);
free(buf);
}
/* Process an Intel supplied microcode container file. */
static void
process_intel(const char *container, const char *outdir)
{
char outname[FILENAME_MAX];
FILE *fin, *fout = NULL;
char *buf, *token;
const char * const sep = ",. \t\n";
uint32_t val;
if ((buf = malloc(BUFFER_SIZE)) == NULL)
error(NULL);
if ((fin = fopen(container, "r")) == NULL)
error(NULL);
/* Process the container file line by line. */
while (fgets(buf, BUFFER_SIZE, fin) != NULL) {
if ((token = strtok(buf, sep)) == NULL)
continue;
if (*token == '/') {
/* Process a comment line. */
if (fout != NULL) {
/* Close previous output file. */
if (fclose(fout) != 0)
error(NULL);
fout = NULL;
}
if ((token = strtok(NULL, sep)) != NULL) {
/* Construct next file name. */
snprintf(outname, sizeof(outname), "%s/%s.fw",
outdir, token);
}
} else {
/* Process a data line. */
if ((fout == NULL) && (token != NULL)) {
if ((fout = fopen(outname, "wb")) == NULL)
error(NULL);
}
while (token != NULL) {
val = htole32(strtoul(token, NULL, 0));
if (fwrite(&val, sizeof(val), 1, fout) != 1)
error(NULL);
token = strtok(NULL, sep);
}
}
}
if (fout != NULL) {
if (fclose(fout) != 0)
error(NULL);
}
if (fclose(fin) != 0)
error(NULL);
free(buf);
}
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