1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 Fabien Thomas <fabient@FreeBSD.org>.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include <sys/cdefs.h>
29__FBSDID("$FreeBSD$");
30
31#include <assert.h>
32#include <stdio.h>
33#include <stdlib.h>
34#include <string.h>
35#include <unistd.h>
36#include <fcntl.h>
37#include <err.h>
38#include <errno.h>
39
40#include <sys/types.h>
41#include <sys/stat.h>
42#include <sys/mman.h>
43#include <sys/ioctl.h>
44#include <sys/ioccom.h>
45#include <sys/cpuctl.h>
46
47#include <machine/cpufunc.h>
48#include <machine/specialreg.h>
49
50#include "cpucontrol.h"
51#include "via.h"
52
53int
54via_probe(int fd)
55{
56	char vendor[13];
57	int error;
58	cpuctl_cpuid_args_t idargs = {
59		.level  = 0,
60	};
61
62	error = ioctl(fd, CPUCTL_CPUID, &idargs);
63	if (error < 0) {
64		WARN(0, "ioctl()");
65		return (1);
66	}
67	((uint32_t *)vendor)[0] = idargs.data[1];
68	((uint32_t *)vendor)[1] = idargs.data[3];
69	((uint32_t *)vendor)[2] = idargs.data[2];
70	vendor[12] = '\0';
71	if (strncmp(vendor, CENTAUR_VENDOR_ID, sizeof(CENTAUR_VENDOR_ID)) != 0)
72		return (1);
73
74	/* TODO: detect Nano CPU. */
75	return (0);
76}
77
78void
79via_update(const struct ucode_update_params *params)
80{
81	int devfd;
82	const char *dev, *path;
83	const uint32_t *fw_image;
84	uint32_t sum;
85	unsigned int i;
86	size_t payload_size;
87	const via_fw_header_t *fw_header;
88	uint32_t signature;
89	int32_t revision;
90	const void *fw_data;
91	size_t data_size, total_size;
92	cpuctl_msr_args_t msrargs = {
93		.msr = MSR_IA32_PLATFORM_ID,
94	};
95	cpuctl_cpuid_args_t idargs = {
96		.level  = 1,	/* Signature. */
97	};
98	cpuctl_update_args_t args;
99	int error;
100
101	dev = params->dev_path;
102	path = params->fw_path;
103	devfd = params->devfd;
104	fw_image = params->fwimage;
105
106	assert(path);
107	assert(dev);
108
109	error = ioctl(devfd, CPUCTL_CPUID, &idargs);
110	if (error < 0) {
111		WARN(0, "ioctl(%s)", dev);
112		goto fail;
113	}
114	signature = idargs.data[0];
115	error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
116	if (error < 0) {
117		WARN(0, "ioctl(%s)", dev);
118		goto fail;
119	}
120
121	/*
122	 * MSR_IA32_PLATFORM_ID contains flag in BCD in bits 52-50.
123	 */
124	msrargs.msr = MSR_BIOS_SIGN;
125	error = ioctl(devfd, CPUCTL_RDMSR, &msrargs);
126	if (error < 0) {
127		WARN(0, "ioctl(%s)", dev);
128		goto fail;
129	}
130	revision = msrargs.data >> 32; /* Revision in the high dword. */
131	WARNX(2, "found cpu type %#x family %#x model %#x stepping %#x.",
132	    (signature >> 12) & 0x03, (signature >> 8) & 0x0f,
133	    (signature >> 4) & 0x0f, (signature >> 0) & 0x0f);
134
135	if (params->fwsize < sizeof(*fw_header)) {
136		WARNX(2, "file too short: %s", path);
137		goto fail;
138	}
139
140	fw_header = (const via_fw_header_t *)fw_image;
141	if (fw_header->signature != VIA_HEADER_SIGNATURE ||
142	    fw_header->loader_revision != VIA_LOADER_REVISION) {
143		WARNX(2, "%s is not a valid via firmware: version mismatch",
144		    path);
145		goto fail;
146	}
147	data_size = fw_header->data_size;
148	total_size = fw_header->total_size;
149	if (total_size > params->fwsize) {
150		WARNX(2, "file too short: %s", path);
151		goto fail;
152	}
153	payload_size = data_size + sizeof(*fw_header);
154
155	/*
156	 * Check the primary checksum.
157	 */
158	sum = 0;
159	for (i = 0; i < (payload_size / sizeof(uint32_t)); i++)
160		sum += *((const uint32_t *)fw_image + i);
161	if (sum != 0) {
162		WARNX(2, "%s: update data checksum invalid", path);
163		goto fail;
164	}
165
166	fw_data = fw_header + 1; /* Pointer to the update data. */
167
168	/*
169	 * Check if the given image is ok for this cpu.
170	 */
171	if (signature != fw_header->cpu_signature)
172		goto fail;
173
174	if (fw_header->revision != 0 && revision >= fw_header->revision) {
175		WARNX(1, "skipping %s of rev %#x: up to date",
176		    path, fw_header->revision);
177		goto fail;
178	}
179	fprintf(stderr, "%s: updating cpu %s from rev %#x to rev %#x... ",
180			path, dev, revision, fw_header->revision);
181	args.data = __DECONST(void *, fw_data);
182	args.size = data_size;
183	error = ioctl(devfd, CPUCTL_UPDATE, &args);
184	if (error < 0) {
185               error = errno;
186	       fprintf(stderr, "failed.\n");
187               errno = error;
188	       WARN(0, "ioctl()");
189	       goto fail;
190	}
191	fprintf(stderr, "done.\n");
192
193fail:
194	return;
195}
196