amd.c revision 181430 
1/*-
2 * Copyright (c) 2006, 2008 Stanislav Sedov <stas@FreeBSD.org>.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include <sys/cdefs.h>
27__FBSDID("$FreeBSD: head/usr.sbin/cpucontrol/amd.c 181430 2008-08-08 16:26:53Z stas $");
28
29#include <assert.h>
30#include <stdio.h>
31#include <stdlib.h>
32#include <string.h>
33#include <unistd.h>
34#include <fcntl.h>
35#include <err.h>
36
37#include <sys/types.h>
38#include <sys/stat.h>
39#include <sys/mman.h>
40#include <sys/ioctl.h>
41#include <sys/ioccom.h>
42#include <sys/cpuctl.h>
43
44#include <machine/cpufunc.h>
45#include <machine/specialreg.h>
46
47#include "cpucontrol.h"
48#include "amd.h"
49
50int
51amd_probe(int fd)
52{
53	char vendor[13];
54	int error;
55	cpuctl_cpuid_args_t idargs = {
56		.level  = 0,
57	};
58
59	error = ioctl(fd, CPUCTL_CPUID, &idargs);
60	if (error < 0) {
61		WARN(0, "ioctl()");
62		return (1);
63	}
64	((uint32_t *)vendor)[0] = idargs.data[1];
65	((uint32_t *)vendor)[1] = idargs.data[3];
66	((uint32_t *)vendor)[2] = idargs.data[2];
67	vendor[12] = '\0';
68	if (strncmp(vendor, AMD_VENDOR_ID, sizeof(AMD_VENDOR_ID)) != 0)
69		return (1);
70	return (0);
71}
72
73void
74amd_update(const char *dev, const char *path)
75{
76	int fd, devfd;
77	unsigned int i;
78	struct stat st;
79	uint32_t *fw_image;
80	amd_fw_header_t *fw_header;
81	uint32_t sum;
82	uint32_t signature;
83	uint32_t *fw_data;
84	size_t fw_size;
85	cpuctl_cpuid_args_t idargs = {
86		.level  = 1,	/* Request signature. */
87	};
88	cpuctl_update_args_t args;
89	int error;
90
91	assert(path);
92	assert(dev);
93
94	fd  = -1;
95	devfd = -1;
96	fw_image = MAP_FAILED;
97	error = 0;
98	devfd = open(dev, O_RDWR);
99	if (devfd < 0) {
100		WARN(0, "could not open %s for writing", dev);
101		return;
102	}
103	error = ioctl(devfd, CPUCTL_CPUID, &idargs);
104	if (error < 0) {
105		WARN(0, "ioctl()");
106		goto fail;
107	}
108	signature = idargs.data[0];
109	WARNX(2, "found cpu family %#x model %#x "
110	    "stepping %#x extfamily %#x extmodel %#x.",
111	    (signature >> 8) & 0x0f, (signature >> 4) & 0x0f,
112	    (signature >> 0) & 0x0f, (signature >> 20) & 0xff,
113	    (signature >> 16) & 0x0f);
114
115	/*
116	 * Open the firmware file.
117	 */
118	fd = open(path, O_RDONLY, 0);
119	if (fd < 0) {
120		WARN(0, "open(%s)", path);
121		goto fail;
122	}
123	error = fstat(fd, &st);
124	if (error != 0) {
125		WARN(0, "fstat(%s)", path);
126		goto fail;
127	}
128	if (st.st_size < 0 || (unsigned)st.st_size < sizeof(*fw_header)) {
129		WARNX(2, "file too short: %s", path);
130		goto fail;
131	}
132	/*
133	 * mmap the whole image.
134	 */
135	fw_image = (uint32_t *)mmap(NULL, st.st_size, PROT_READ,
136	    MAP_PRIVATE, fd, 0);
137	if  (fw_image == MAP_FAILED) {
138		WARN(0, "mmap(%s)", path);
139		goto fail;
140	}
141	fw_header = (amd_fw_header_t *)fw_image;
142	if ((fw_header->magic >> 8) != AMD_MAGIC) {
143		WARNX(2, "%s is not a valid amd firmware: version mismatch",
144		    path);
145		goto fail;
146	}
147	fw_data = (uint32_t *)(fw_header + 1);
148	fw_size = (st.st_size - sizeof(*fw_header)) / sizeof(uint32_t);
149
150	/*
151	 * Check the primary checksum.
152	 */
153	sum = 0;
154	for (i = 0; i < fw_size; i++)
155		sum += fw_data[i];
156	if (sum != fw_header->checksum) {
157		WARNX(2, "%s: update data checksum invalid", path);
158		goto fail;
159	}
160	if (signature == fw_header->signature) {
161		fprintf(stderr, "%s: updating cpu %s... ", path, dev);
162
163		args.data = fw_image;
164		args.size = st.st_size;
165		error = ioctl(fd, CPUCTL_UPDATE, &args);
166		if (error < 0) {
167			fprintf(stderr, "failed.\n");
168			warn("ioctl()");
169			goto fail;
170		}
171		fprintf(stderr, "done.\n");
172	}
173
174fail:
175	if (fd >= 0)
176		close(fd);
177	if (devfd >= 0)
178		close(devfd);
179	if (fw_image != MAP_FAILED)
180		if(munmap(fw_image, st.st_size) != 0)
181			warn("munmap(%s)", path);
182	return;
183}
184