2 * Copyright (c) 2006-2008 Stanislav Sedov <stas@FreeBSD.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * $FreeBSD: head/sys/dev/cpuctl/cpuctl.c 275960 2014-12-20 16:40:49Z kib $
30 #include <sys/param.h>
31 #include <sys/systm.h>
33 #include <sys/fcntl.h>
34 #include <sys/ioccom.h>
35 #include <sys/malloc.h>
36 #include <sys/module.h>
39 #include <sys/queue.h>
40 #include <sys/sched.h>
41 #include <sys/kernel.h>
42 #include <sys/sysctl.h>
44 #include <sys/cpuctl.h>
45 #include <sys/device.h>
46 #include <sys/thread2.h>
48 #include <machine/cpufunc.h>
49 #include <machine/md_var.h>
50 #include <machine/specialreg.h>
52 static d_open_t cpuctl_open;
53 static d_ioctl_t cpuctl_ioctl;
55 #define CPUCTL_VERSION 1
58 # define DPRINTF(format,...) kprintf(format, __VA_ARGS__);
60 # define DPRINTF(format,...)
63 #define UCODE_SIZE_MAX (32 * 1024)
65 static int cpuctl_do_msr(int cpu, cpuctl_msr_args_t *data, u_long cmd);
66 static void cpuctl_do_cpuid(int cpu, cpuctl_cpuid_args_t *data);
67 static void cpuctl_do_cpuid_count(int cpu, cpuctl_cpuid_count_args_t *data);
68 static int cpuctl_do_update(int cpu, cpuctl_update_args_t *data);
69 static int update_intel(int cpu, cpuctl_update_args_t *args);
70 static int update_amd(int cpu, cpuctl_update_args_t *args);
71 static int update_via(int cpu, cpuctl_update_args_t *args);
73 static cdev_t *cpuctl_devs;
74 static MALLOC_DEFINE(M_CPUCTL, "cpuctl", "CPUCTL buffer");
76 static struct dev_ops cpuctl_cdevsw = {
77 .d_open = cpuctl_open,
78 .d_ioctl = cpuctl_ioctl,
79 .head = { .name = "cpuctl" },
83 cpuctl_ioctl(struct dev_ioctl_args *ap)
86 int cpu = dev2unit(ap->a_head.a_dev);
87 u_long cmd = ap->a_cmd;
88 int flags = ap->a_fflag;
89 caddr_t data = ap->a_data;
92 DPRINTF("[cpuctl,%d]: bad cpu number %d\n", __LINE__, cpu);
95 /* Require write flag for "write" requests. */
96 if ((cmd == CPUCTL_WRMSR || cmd == CPUCTL_UPDATE) &&
97 ((flags & FWRITE) == 0))
101 ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd);
106 ret = priv_check(curthread, PRIV_CPUCTL_WRMSR);
109 ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd);
112 cpuctl_do_cpuid(cpu, (cpuctl_cpuid_args_t *)data);
116 ret = priv_check(curthread, PRIV_CPUCTL_UPDATE);
119 ret = cpuctl_do_update(cpu, (cpuctl_update_args_t *)data);
121 case CPUCTL_CPUID_COUNT:
122 cpuctl_do_cpuid_count(cpu, (cpuctl_cpuid_count_args_t *)data);
134 * Actually perform cpuid operation.
137 cpuctl_do_cpuid_count(int cpu, cpuctl_cpuid_count_args_t *data)
141 KASSERT(cpu >= 0 && cpu < ncpus,
142 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
144 /* Explicitly clear cpuid data to avoid returning stale info. */
145 bzero(data->data, sizeof(data->data));
146 DPRINTF("[cpuctl,%d]: retrieving cpuid lev %#0x type %#0x for %d cpu\n",
147 __LINE__, data->level, data->level_type, cpu);
149 lwkt_migratecpu(cpu);
150 cpuid_count(data->level, data->level_type, data->data);
151 lwkt_migratecpu(oldcpu);
155 cpuctl_do_cpuid(int cpu, cpuctl_cpuid_args_t *data)
157 cpuctl_cpuid_count_args_t cdata;
159 cdata.level = data->level;
160 /* Override the level type. */
161 cdata.level_type = 0;
162 cpuctl_do_cpuid_count(cpu, &cdata);
163 bcopy(cdata.data, data->data, sizeof(data->data)); /* Ignore error */
167 * Actually perform MSR operations.
170 cpuctl_do_msr(int cpu, cpuctl_msr_args_t *data, u_long cmd)
176 KASSERT(cpu >= 0 && cpu < ncpus,
177 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
180 * Explicitly clear cpuid data to avoid returning stale
183 DPRINTF("[cpuctl,%d]: operating on MSR %#0x for %d cpu\n", __LINE__,
186 lwkt_migratecpu(cpu);
187 if (cmd == CPUCTL_RDMSR) {
189 ret = rdmsr_safe(data->msr, &data->data);
190 } else if (cmd == CPUCTL_WRMSR) {
191 ret = wrmsr_safe(data->msr, data->data);
192 } else if (cmd == CPUCTL_MSRSBIT) {
194 ret = rdmsr_safe(data->msr, ®);
196 ret = wrmsr_safe(data->msr, reg | data->data);
198 } else if (cmd == CPUCTL_MSRCBIT) {
200 ret = rdmsr_safe(data->msr, ®);
202 ret = wrmsr_safe(data->msr, reg & ~data->data);
205 panic("[cpuctl,%d]: unknown operation requested: %lu", __LINE__, cmd);
206 lwkt_migratecpu(oldcpu);
211 * Actually perform microcode update.
214 cpuctl_do_update(int cpu, cpuctl_update_args_t *data)
216 cpuctl_cpuid_args_t args = {
222 KASSERT(cpu >= 0 && cpu < ncpus,
223 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
224 DPRINTF("[cpuctl,%d]: XXX %d", __LINE__, cpu);
226 cpuctl_do_cpuid(cpu, &args);
227 ((uint32_t *)vendor)[0] = args.data[1];
228 ((uint32_t *)vendor)[1] = args.data[3];
229 ((uint32_t *)vendor)[2] = args.data[2];
231 if (strncmp(vendor, INTEL_VENDOR_ID, sizeof(INTEL_VENDOR_ID)) == 0)
232 ret = update_intel(cpu, data);
233 else if(strncmp(vendor, AMD_VENDOR_ID, sizeof(AMD_VENDOR_ID)) == 0)
234 ret = update_amd(cpu, data);
235 else if(strncmp(vendor, CENTAUR_VENDOR_ID, sizeof(CENTAUR_VENDOR_ID)) == 0)
236 ret = update_via(cpu, data);
243 update_intel(int cpu, cpuctl_update_args_t *args)
251 if (args->size == 0 || args->data == NULL) {
252 DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
255 if (args->size > UCODE_SIZE_MAX) {
256 DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
261 * 16 byte alignment required. Rely on the fact that
262 * malloc(9) always returns the pointer aligned at least on
263 * the size of the allocation.
265 ptr = kmalloc(args->size + 16, M_CPUCTL, M_WAITOK);
266 if (copyin(args->data, ptr, args->size) != 0) {
267 DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
268 __LINE__, args->data, ptr, args->size);
273 lwkt_migratecpu(cpu);
275 rdmsr_safe(MSR_BIOS_SIGN, &rev0); /* Get current microcode revision. */
280 wrmsr_safe(MSR_BIOS_UPDT_TRIG, (uintptr_t)(ptr));
281 wrmsr_safe(MSR_BIOS_SIGN, 0);
284 * Serialize instruction flow.
288 rdmsr_safe(MSR_BIOS_SIGN, &rev1); /* Get new microcode revision. */
289 lwkt_migratecpu(oldcpu);
290 kprintf("[cpu %d]: updated microcode from rev=0x%x to rev=0x%x\n", cpu,
291 (unsigned)(rev0 >> 32), (unsigned)(rev1 >> 32));
298 kfree(ptr, M_CPUCTL);
303 update_amd(int cpu, cpuctl_update_args_t *args)
310 if (args->size == 0 || args->data == NULL) {
311 DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
314 if (args->size > UCODE_SIZE_MAX) {
315 DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
319 * XXX Might not require contignous address space - needs check
321 ptr = contigmalloc(args->size, M_CPUCTL, 0, 0, 0xffffffff, 16, 0);
323 DPRINTF("[cpuctl,%d]: cannot allocate %zd bytes of memory",
324 __LINE__, args->size);
327 if (copyin(args->data, ptr, args->size) != 0) {
328 DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
329 __LINE__, args->data, ptr, args->size);
334 lwkt_migratecpu(cpu);
340 wrmsr_safe(MSR_K8_UCODE_UPDATE, (uintptr_t)ptr);
343 * Serialize instruction flow.
347 lwkt_migratecpu(oldcpu);
351 contigfree(ptr, args->size, M_CPUCTL);
356 update_via(int cpu, cpuctl_update_args_t *args)
359 uint64_t rev0, rev1, res;
364 if (args->size == 0 || args->data == NULL) {
365 DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
368 if (args->size > UCODE_SIZE_MAX) {
369 DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
374 * 4 byte alignment required.
376 ptr = kmalloc(args->size, M_CPUCTL, M_WAITOK);
377 if (copyin(args->data, ptr, args->size) != 0) {
378 DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
379 __LINE__, args->data, ptr, args->size);
384 lwkt_migratecpu(cpu);
386 rdmsr_safe(MSR_BIOS_SIGN, &rev0); /* Get current microcode revision. */
391 wrmsr_safe(MSR_BIOS_UPDT_TRIG, (uintptr_t)(ptr));
395 * Result are in low byte of MSR FCR5:
396 * 0x00: No update has been attempted since RESET.
397 * 0x01: The last attempted update was successful.
398 * 0x02: The last attempted update was unsuccessful due to a bad
399 * environment. No update was loaded and any preexisting
400 * patches are still active.
401 * 0x03: The last attempted update was not applicable to this processor.
402 * No update was loaded and any preexisting patches are still
404 * 0x04: The last attempted update was not successful due to an invalid
405 * update data block. No update was loaded and any preexisting
406 * patches are still active
408 rdmsr_safe(0x1205, &res);
411 rdmsr_safe(MSR_BIOS_SIGN, &rev1); /* Get new microcode revision. */
412 lwkt_migratecpu(oldcpu);
414 DPRINTF("[cpu,%d]: rev0=%x rev1=%x res=%x\n", __LINE__,
415 (unsigned)(rev0 >> 32), (unsigned)(rev1 >> 32), (unsigned)res);
422 kfree(ptr, M_CPUCTL);
427 cpuctl_open(struct dev_open_args *ap)
432 cpu = dev2unit(ap->a_head.a_dev);
434 DPRINTF("[cpuctl,%d]: incorrect cpu number %d\n", __LINE__,
438 if (ap->a_oflags & FWRITE)
439 ret = securelevel > 0 ? EPERM : 0;
444 cpuctl_modevent(module_t mod __unused, int type, void *data __unused)
450 if ((cpu_feature & CPUID_MSR) == 0) {
452 kprintf("cpuctl: not available.\n");
456 kprintf("cpuctl: access to MSR registers/cpuid info.\n");
457 cpuctl_devs = kmalloc(sizeof(*cpuctl_devs) * ncpus, M_CPUCTL,
459 for (cpu = 0; cpu < ncpus; cpu++)
460 cpuctl_devs[cpu] = make_dev(&cpuctl_cdevsw, cpu,
461 UID_ROOT, GID_KMEM, 0640, "cpuctl%d", cpu);
464 for (cpu = 0; cpu < ncpus; cpu++) {
465 if (cpuctl_devs[cpu] != NULL)
466 destroy_dev(cpuctl_devs[cpu]);
468 kfree(cpuctl_devs, M_CPUCTL);
478 DEV_MODULE(cpuctl, cpuctl_modevent, NULL);
479 MODULE_VERSION(cpuctl, CPUCTL_VERSION);