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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (C) 2018 The FreeBSD Foundation.
*
* 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.
*/
#include <err.h>
#include <fcntl.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
static const size_t bufsize = 65536;
/* SDM vol 3 9.11.1 Intel microcode header. */
struct microcode_update_header {
uint32_t header_version;
uint32_t update_revision;
uint32_t date; /* BCD mmddyyyy */
uint32_t processor_signature;
uint32_t checksum; /* Over update data and header */
uint32_t loader_revision;
uint32_t processor_flags;
uint32_t data_size;
uint32_t total_size;
uint32_t reserved[3];
};
/*
* SDM vol 2A CPUID EAX = 01h Returns Model, Family, Stepping Information.
* Caller must free the returned string.
*/
static char *
format_signature(uint32_t signature)
{
char *buf;
unsigned family, model, stepping;
family = (signature & 0xf00) >> 8;
model = (signature & 0xf0) >> 4;
stepping = signature & 0xf;
if (family == 0x06 || family == 0x0f)
model += (signature & 0xf0000) >> 12;
if (family == 0x0f)
family += (signature & 0xff00000) >> 20;
asprintf(&buf, "%02x-%02x-%02x", family, model, stepping);
if (buf == NULL)
err(1, "asprintf");
return (buf);
}
static void
dump_header(const struct microcode_update_header *hdr)
{
char *sig_str;
int i;
bool platformid_printed;
sig_str = format_signature(hdr->processor_signature);
printf("header version\t0x%x\n", hdr->header_version);
printf("revision\t0x%x\n", hdr->update_revision);
printf("date\t\t0x%x\t%04x-%02x-%02x\n", hdr->date,
hdr->date & 0xffff, (hdr->date & 0xff000000) >> 24,
(hdr->date & 0xff0000) >> 16);
printf("signature\t0x%x\t\t%s\n", hdr->processor_signature, sig_str);
printf("checksum\t0x%x\n", hdr->checksum);
printf("loader revision\t0x%x\n", hdr->loader_revision);
printf("processor flags\t0x%x", hdr->processor_flags);
platformid_printed = false;
for (i = 0; i < 8; i++) {
if (hdr->processor_flags & 1 << i) {
printf("%s%d", platformid_printed ? ", " : "\t\t", i);
platformid_printed = true;
}
}
printf("\n");
printf("datasize\t0x%x\t\t0x%x\n", hdr->data_size,
hdr->data_size != 0 ? hdr->data_size : 2000);
printf("size\t\t0x%x\t\t0x%x\n", hdr->total_size,
hdr->total_size != 0 ? hdr->total_size : 2048);
free(sig_str);
}
static void
usage(void)
{
printf("ucode-split [-v] microcode_file\n");
exit(1);
}
int
main(int argc, char *argv[])
{
struct microcode_update_header hdr;
char *buf, *output_file, *sig_str;
size_t len, resid;
ssize_t rv;
int c, ifd, ofd;
bool vflag;
vflag = false;
while ((c = getopt(argc, argv, "v")) != -1) {
switch (c) {
case 'v':
vflag = true;
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc != 1)
usage();
ifd = open(argv[0], O_RDONLY);
if (ifd < 0)
err(1, "open");
buf = malloc(bufsize);
if (buf == NULL)
err(1, "malloc");
for (;;) {
/* Read header. */
rv = read(ifd, &hdr, sizeof(hdr));
if (rv < 0) {
err(1, "read");
} else if (rv == 0) {
break;
} else if (rv < (ssize_t)sizeof(hdr)) {
errx(1, "invalid microcode header");
}
if (hdr.header_version != 1)
errx(1, "invalid header version");
if (vflag)
dump_header(&hdr);
sig_str = format_signature(hdr.processor_signature);
asprintf(&output_file, "%s.%02x", sig_str,
hdr.processor_flags & 0xff);
free(sig_str);
if (output_file == NULL)
err(1, "asprintf");
ofd = open(output_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
if (ofd < 0)
err(1, "open");
/* Write header. */
rv = write(ofd, &hdr, sizeof(hdr));
if (rv < (ssize_t)sizeof(hdr))
err(1, "write");
/* Copy data. */
resid = (hdr.total_size != 0 ? hdr.total_size : 2048) -
sizeof(hdr);
if (resid > 1 << 24) /* Arbitrary chosen maximum size. */
errx(1, "header total_size too large");
while (resid > 0) {
len = resid < bufsize ? resid : bufsize;
rv = read(ifd, buf, len);
if (rv < 0)
err(1, "read");
else if (rv < (ssize_t)len)
errx(1, "truncated microcode data");
if (write(ofd, buf, len) < (ssize_t)len)
err(1, "write");
resid -= len;
}
if (vflag)
printf("written to %s\n\n", output_file);
close(ofd);
free(output_file);
}
}
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