mirror of
https://github.com/freebsd/freebsd-src
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194 lines
5.1 KiB
C
194 lines
5.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause
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*
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* Copyright (c) 2011 Fabien Thomas <fabient@FreeBSD.org>.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <err.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <sys/ioctl.h>
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#include <sys/ioccom.h>
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#include <sys/cpuctl.h>
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#include <machine/cpufunc.h>
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#include <machine/specialreg.h>
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#include "cpucontrol.h"
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#include "via.h"
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int
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via_probe(int fd)
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{
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char vendor[13];
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int error;
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cpuctl_cpuid_args_t idargs = {
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.level = 0,
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};
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error = ioctl(fd, CPUCTL_CPUID, &idargs);
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if (error < 0) {
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WARN(0, "ioctl()");
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return (1);
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}
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((uint32_t *)vendor)[0] = idargs.data[1];
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((uint32_t *)vendor)[1] = idargs.data[3];
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((uint32_t *)vendor)[2] = idargs.data[2];
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vendor[12] = '\0';
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if (strncmp(vendor, CENTAUR_VENDOR_ID, sizeof(CENTAUR_VENDOR_ID)) != 0)
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return (1);
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/* TODO: detect Nano CPU. */
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return (0);
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}
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void
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via_update(const struct ucode_update_params *params)
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{
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int devfd;
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const char *dev, *path;
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const uint32_t *fw_image;
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uint32_t sum;
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unsigned int i;
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size_t payload_size;
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const via_fw_header_t *fw_header;
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uint32_t signature;
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int32_t revision;
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const void *fw_data;
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size_t data_size, total_size;
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cpuctl_msr_args_t msrargs = {
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.msr = MSR_IA32_PLATFORM_ID,
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};
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cpuctl_cpuid_args_t idargs = {
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.level = 1, /* Signature. */
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};
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cpuctl_update_args_t args;
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int error;
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dev = params->dev_path;
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path = params->fw_path;
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devfd = params->devfd;
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fw_image = params->fwimage;
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assert(path);
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assert(dev);
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error = ioctl(devfd, CPUCTL_CPUID, &idargs);
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if (error < 0) {
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WARN(0, "ioctl(%s)", dev);
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goto fail;
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}
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signature = idargs.data[0];
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error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
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if (error < 0) {
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WARN(0, "ioctl(%s)", dev);
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goto fail;
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}
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/*
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* MSR_IA32_PLATFORM_ID contains flag in BCD in bits 52-50.
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*/
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msrargs.msr = MSR_BIOS_SIGN;
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error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
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if (error < 0) {
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WARN(0, "ioctl(%s)", dev);
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goto fail;
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}
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revision = msrargs.data >> 32; /* Revision in the high dword. */
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WARNX(2, "found cpu type %#x family %#x model %#x stepping %#x.",
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(signature >> 12) & 0x03, (signature >> 8) & 0x0f,
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(signature >> 4) & 0x0f, (signature >> 0) & 0x0f);
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if (params->fwsize < sizeof(*fw_header)) {
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WARNX(2, "file too short: %s", path);
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goto fail;
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}
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fw_header = (const via_fw_header_t *)fw_image;
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if (fw_header->signature != VIA_HEADER_SIGNATURE ||
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fw_header->loader_revision != VIA_LOADER_REVISION) {
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WARNX(2, "%s is not a valid via firmware: version mismatch",
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path);
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goto fail;
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}
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data_size = fw_header->data_size;
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total_size = fw_header->total_size;
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if (total_size > params->fwsize) {
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WARNX(2, "file too short: %s", path);
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goto fail;
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}
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payload_size = data_size + sizeof(*fw_header);
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/*
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* Check the primary checksum.
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*/
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sum = 0;
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for (i = 0; i < (payload_size / sizeof(uint32_t)); i++)
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sum += *((const uint32_t *)fw_image + i);
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if (sum != 0) {
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WARNX(2, "%s: update data checksum invalid", path);
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goto fail;
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}
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fw_data = fw_header + 1; /* Pointer to the update data. */
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/*
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* Check if the given image is ok for this cpu.
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*/
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if (signature != fw_header->cpu_signature)
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goto fail;
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if (fw_header->revision != 0 && revision >= fw_header->revision) {
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WARNX(1, "skipping %s of rev %#x: up to date",
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path, fw_header->revision);
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goto fail;
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}
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fprintf(stderr, "%s: updating cpu %s from rev %#x to rev %#x... ",
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path, dev, revision, fw_header->revision);
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args.data = __DECONST(void *, fw_data);
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args.size = data_size;
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error = ioctl(devfd, CPUCTL_UPDATE, &args);
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if (error < 0) {
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error = errno;
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fprintf(stderr, "failed.\n");
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errno = error;
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WARN(0, "ioctl()");
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goto fail;
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}
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fprintf(stderr, "done.\n");
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fail:
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return;
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}
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