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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2011 Fabien Thomas <fabient@FreeBSD.org>.
* 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 ``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 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <err.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/ioccom.h>
#include <sys/cpuctl.h>
#include <machine/cpufunc.h>
#include <machine/specialreg.h>
#include "cpucontrol.h"
#include "via.h"
int
via_probe(int fd)
{
char vendor[13];
int error;
cpuctl_cpuid_args_t idargs = {
.level = 0,
};
error = ioctl(fd, CPUCTL_CPUID, &idargs);
if (error < 0) {
WARN(0, "ioctl()");
return (1);
}
((uint32_t *)vendor)[0] = idargs.data[1];
((uint32_t *)vendor)[1] = idargs.data[3];
((uint32_t *)vendor)[2] = idargs.data[2];
vendor[12] = '\0';
if (strncmp(vendor, CENTAUR_VENDOR_ID, sizeof(CENTAUR_VENDOR_ID)) != 0)
return (1);
/* TODO: detect Nano CPU. */
return (0);
}
void
via_update(const char *dev, const char *path)
{
int fd, devfd;
struct stat st;
uint32_t *fw_image;
uint32_t sum;
unsigned int i;
size_t payload_size;
via_fw_header_t *fw_header;
uint32_t signature;
int32_t revision;
void *fw_data;
size_t data_size, total_size;
cpuctl_msr_args_t msrargs = {
.msr = MSR_IA32_PLATFORM_ID,
};
cpuctl_cpuid_args_t idargs = {
.level = 1, /* Signature. */
};
cpuctl_update_args_t args;
int error;
assert(path);
assert(dev);
fd = -1;
devfd = -1;
fw_image = MAP_FAILED;
devfd = open(dev, O_RDWR);
if (devfd < 0) {
WARN(0, "could not open %s for writing", dev);
return;
}
error = ioctl(devfd, CPUCTL_CPUID, &idargs);
if (error < 0) {
WARN(0, "ioctl(%s)", dev);
goto fail;
}
signature = idargs.data[0];
error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
if (error < 0) {
WARN(0, "ioctl(%s)", dev);
goto fail;
}
/*
* MSR_IA32_PLATFORM_ID contains flag in BCD in bits 52-50.
*/
msrargs.msr = MSR_BIOS_SIGN;
error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
if (error < 0) {
WARN(0, "ioctl(%s)", dev);
goto fail;
}
revision = msrargs.data >> 32; /* Revision in the high dword. */
WARNX(2, "found cpu type %#x family %#x model %#x stepping %#x.",
(signature >> 12) & 0x03, (signature >> 8) & 0x0f,
(signature >> 4) & 0x0f, (signature >> 0) & 0x0f);
/*
* Open firmware image.
*/
fd = open(path, O_RDONLY, 0);
if (fd < 0) {
WARN(0, "open(%s)", path);
goto fail;
}
error = fstat(fd, &st);
if (error != 0) {
WARN(0, "fstat(%s)", path);
goto fail;
}
if (st.st_size < 0 || (unsigned)st.st_size < sizeof(*fw_header)) {
WARNX(2, "file too short: %s", path);
goto fail;
}
/*
* mmap the whole image.
*/
fw_image = (uint32_t *)mmap(NULL, st.st_size, PROT_READ,
MAP_PRIVATE, fd, 0);
if (fw_image == MAP_FAILED) {
WARN(0, "mmap(%s)", path);
goto fail;
}
fw_header = (via_fw_header_t *)fw_image;
if (fw_header->signature != VIA_HEADER_SIGNATURE ||
fw_header->loader_revision != VIA_LOADER_REVISION) {
WARNX(2, "%s is not a valid via firmware: version mismatch",
path);
goto fail;
}
data_size = fw_header->data_size;
total_size = fw_header->total_size;
if (total_size > (unsigned)st.st_size || st.st_size < 0) {
WARNX(2, "file too short: %s", path);
goto fail;
}
payload_size = data_size + sizeof(*fw_header);
/*
* Check the primary checksum.
*/
sum = 0;
for (i = 0; i < (payload_size / sizeof(uint32_t)); i++)
sum += *((uint32_t *)fw_image + i);
if (sum != 0) {
WARNX(2, "%s: update data checksum invalid", path);
goto fail;
}
fw_data = fw_header + 1; /* Pointer to the update data. */
/*
* Check if the given image is ok for this cpu.
*/
if (signature != fw_header->cpu_signature)
goto fail;
if (fw_header->revision != 0 && revision >= fw_header->revision) {
WARNX(1, "skipping %s of rev %#x: up to date",
path, fw_header->revision);
goto fail;
}
fprintf(stderr, "%s: updating cpu %s from rev %#x to rev %#x... ",
path, dev, revision, fw_header->revision);
args.data = fw_data;
args.size = data_size;
error = ioctl(devfd, CPUCTL_UPDATE, &args);
if (error < 0) {
error = errno;
fprintf(stderr, "failed.\n");
errno = error;
WARN(0, "ioctl()");
goto fail;
}
fprintf(stderr, "done.\n");
fail:
if (fw_image != MAP_FAILED)
if (munmap(fw_image, st.st_size) != 0)
warn("munmap(%s)", path);
if (devfd >= 0)
close(devfd);
if (fd >= 0)
close(fd);
return;
}
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