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
29 #include <sys/param.h>
30 #include <sys/systm.h>
32 #include <sys/fcntl.h>
33 #include <sys/ioccom.h>
34 #include <sys/malloc.h>
35 #include <sys/module.h>
38 #include <sys/queue.h>
39 #include <sys/sched.h>
40 #include <sys/kernel.h>
41 #include <sys/sysctl.h>
43 #include <sys/cpuctl.h>
44 #include <sys/device.h>
45 #include <sys/thread2.h>
47 #include <machine/cpufunc.h>
48 #include <machine/md_var.h>
49 #include <machine/specialreg.h>
51 static d_open_t cpuctl_open;
52 static d_ioctl_t cpuctl_ioctl;
54 #define CPUCTL_VERSION 1
57 # define DPRINTF(format,...) kprintf(format, __VA_ARGS__);
59 # define DPRINTF(format,...)
62 #define UCODE_SIZE_MAX (16 * 1024)
64 static int cpuctl_do_msr(int cpu, cpuctl_msr_args_t *data, u_long cmd);
65 static int cpuctl_do_cpuid(int cpu, cpuctl_cpuid_args_t *data);
66 static int cpuctl_do_update(int cpu, cpuctl_update_args_t *data);
67 static int update_intel(int cpu, cpuctl_update_args_t *args);
68 static int update_amd(int cpu, cpuctl_update_args_t *args);
69 static int update_via(int cpu, cpuctl_update_args_t *args);
71 static cdev_t *cpuctl_devs;
72 static MALLOC_DEFINE(M_CPUCTL, "cpuctl", "CPUCTL buffer");
74 static struct dev_ops cpuctl_cdevsw = {
75 .d_open = cpuctl_open,
76 .d_ioctl = cpuctl_ioctl,
77 .head = { .name = "cpuctl" },
81 cpuctl_ioctl(struct dev_ioctl_args *ap)
84 int cpu = dev2unit(ap->a_head.a_dev);
85 u_long cmd = ap->a_cmd;
86 int flags = ap->a_fflag;
87 caddr_t data = ap->a_data;
90 DPRINTF("[cpuctl,%d]: bad cpu number %d\n", __LINE__, cpu);
93 /* Require write flag for "write" requests. */
94 if ((cmd == CPUCTL_WRMSR || cmd == CPUCTL_UPDATE) &&
95 ((flags & FWRITE) == 0))
99 ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd);
104 ret = priv_check(curthread, PRIV_CPUCTL_WRMSR);
107 ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd);
110 ret = cpuctl_do_cpuid(cpu, (cpuctl_cpuid_args_t *)data);
113 ret = priv_check(curthread, PRIV_CPUCTL_UPDATE);
116 ret = cpuctl_do_update(cpu, (cpuctl_update_args_t *)data);
127 * Actually perform cpuid operation.
130 cpuctl_do_cpuid(int cpu, cpuctl_cpuid_args_t *data)
134 KASSERT(cpu >= 0 && cpu < ncpus,
135 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
137 /* Explicitly clear cpuid data to avoid returning stale info. */
138 bzero(data->data, sizeof(data->data));
139 DPRINTF("[cpuctl,%d]: retriving cpuid level %#0x for %d cpu\n",
140 __LINE__, data->level, cpu);
142 lwkt_migratecpu(cpu);
143 cpuid_count(data->level, 0, data->data);
144 lwkt_migratecpu(oldcpu);
149 * Actually perform MSR operations.
152 cpuctl_do_msr(int cpu, cpuctl_msr_args_t *data, u_long cmd)
158 KASSERT(cpu >= 0 && cpu < ncpus ,
159 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
162 * Explicitly clear cpuid data to avoid returning stale
165 DPRINTF("[cpuctl,%d]: operating on MSR %#0x for %d cpu\n", __LINE__,
168 lwkt_migratecpu(cpu);
169 if (cmd == CPUCTL_RDMSR) {
171 ret = rdmsr_safe(data->msr, &data->data);
172 } else if (cmd == CPUCTL_WRMSR) {
173 ret = wrmsr_safe(data->msr, data->data);
174 } else if (cmd == CPUCTL_MSRSBIT) {
176 ret = rdmsr_safe(data->msr, ®);
178 ret = wrmsr_safe(data->msr, reg | data->data);
180 } else if (cmd == CPUCTL_MSRCBIT) {
182 ret = rdmsr_safe(data->msr, ®);
184 ret = wrmsr_safe(data->msr, reg & ~data->data);
187 panic("[cpuctl,%d]: unknown operation requested: %lu", __LINE__, cmd);
188 lwkt_migratecpu(oldcpu);
193 * Actually perform microcode update.
196 cpuctl_do_update(int cpu, cpuctl_update_args_t *data)
198 cpuctl_cpuid_args_t args = {
204 KASSERT(cpu >= 0 && cpu < ncpus,
205 ("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
206 DPRINTF("[cpuctl,%d]: XXX %d", __LINE__, cpu);
208 ret = cpuctl_do_cpuid(cpu, &args);
210 DPRINTF("[cpuctl,%d]: cannot retrive cpuid info for cpu %d",
214 ((uint32_t *)vendor)[0] = args.data[1];
215 ((uint32_t *)vendor)[1] = args.data[3];
216 ((uint32_t *)vendor)[2] = args.data[2];
218 if (strncmp(vendor, INTEL_VENDOR_ID, sizeof(INTEL_VENDOR_ID)) == 0)
219 ret = update_intel(cpu, data);
220 else if(strncmp(vendor, AMD_VENDOR_ID, sizeof(AMD_VENDOR_ID)) == 0)
221 ret = update_amd(cpu, data);
222 else if(strncmp(vendor, CENTAUR_VENDOR_ID, sizeof(CENTAUR_VENDOR_ID)) == 0)
223 ret = update_via(cpu, data);
230 update_intel(int cpu, cpuctl_update_args_t *args)
238 if (args->size == 0 || args->data == NULL) {
239 DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
242 if (args->size > UCODE_SIZE_MAX) {
243 DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
248 * 16 byte alignment required. Rely on the fact that
249 * malloc(9) always returns the pointer aligned at least on
250 * the size of the allocation.
252 ptr = kmalloc(args->size + 16, M_CPUCTL, M_WAITOK);
253 if (copyin(args->data, ptr, args->size) != 0) {
254 DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
255 __LINE__, args->data, ptr, args->size);
260 lwkt_migratecpu(cpu);
262 rdmsr_safe(MSR_BIOS_SIGN, &rev0); /* Get current microcode revision. */
267 wrmsr_safe(MSR_BIOS_UPDT_TRIG, (uintptr_t)(ptr));
268 wrmsr_safe(MSR_BIOS_SIGN, 0);
271 * Serialize instruction flow.
275 rdmsr_safe(MSR_BIOS_SIGN, &rev1); /* Get new microcode revision. */
276 lwkt_migratecpu(oldcpu);
277 kprintf("[cpu %d]: updated microcode from rev=0x%x to rev=0x%x\n", cpu,
278 (unsigned)(rev0 >> 32), (unsigned)(rev1 >> 32));
285 kfree(ptr, M_CPUCTL);
290 update_amd(int cpu, cpuctl_update_args_t *args)
297 if (args->size == 0 || args->data == NULL) {
298 DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
301 if (args->size > UCODE_SIZE_MAX) {
302 DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
306 * XXX Might not require contignous address space - needs check
308 ptr = contigmalloc(args->size, M_CPUCTL, 0, 0, 0xffffffff, 16, 0);
310 DPRINTF("[cpuctl,%d]: cannot allocate %zd bytes of memory",
311 __LINE__, args->size);
314 if (copyin(args->data, ptr, args->size) != 0) {
315 DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
316 __LINE__, args->data, ptr, args->size);
321 lwkt_migratecpu(cpu);
327 wrmsr_safe(MSR_K8_UCODE_UPDATE, (uintptr_t)ptr);
330 * Serialize instruction flow.
334 lwkt_migratecpu(oldcpu);
338 contigfree(ptr, args->size, M_CPUCTL);
343 update_via(int cpu, cpuctl_update_args_t *args)
346 uint64_t rev0, rev1, res;
351 if (args->size == 0 || args->data == NULL) {
352 DPRINTF("[cpuctl,%d]: zero-sized firmware image", __LINE__);
355 if (args->size > UCODE_SIZE_MAX) {
356 DPRINTF("[cpuctl,%d]: firmware image too large", __LINE__);
361 * 4 byte alignment required.
363 ptr = kmalloc(args->size, M_CPUCTL, M_WAITOK);
364 if (copyin(args->data, ptr, args->size) != 0) {
365 DPRINTF("[cpuctl,%d]: copyin %p->%p of %zd bytes failed",
366 __LINE__, args->data, ptr, args->size);
371 lwkt_migratecpu(cpu);
373 rdmsr_safe(MSR_BIOS_SIGN, &rev0); /* Get current microcode revision. */
378 wrmsr_safe(MSR_BIOS_UPDT_TRIG, (uintptr_t)(ptr));
382 * Result are in low byte of MSR FCR5:
383 * 0x00: No update has been attempted since RESET.
384 * 0x01: The last attempted update was successful.
385 * 0x02: The last attempted update was unsuccessful due to a bad
386 * environment. No update was loaded and any preexisting
387 * patches are still active.
388 * 0x03: The last attempted update was not applicable to this processor.
389 * No update was loaded and any preexisting patches are still
391 * 0x04: The last attempted update was not successful due to an invalid
392 * update data block. No update was loaded and any preexisting
393 * patches are still active
395 rdmsr_safe(0x1205, &res);
398 rdmsr_safe(MSR_BIOS_SIGN, &rev1); /* Get new microcode revision. */
399 lwkt_migratecpu(oldcpu);
401 DPRINTF("[cpu,%d]: rev0=%x rev1=%x res=%x\n", __LINE__,
402 (unsigned)(rev0 >> 32), (unsigned)(rev1 >> 32), (unsigned)res);
409 kfree(ptr, M_CPUCTL);
414 cpuctl_open(struct dev_open_args *ap)
419 cpu = dev2unit(ap->a_head.a_dev);
421 DPRINTF("[cpuctl,%d]: incorrect cpu number %d\n", __LINE__,
425 if (ap->a_oflags & FWRITE)
426 ret = securelevel > 0 ? EPERM : 0;
431 cpuctl_modevent(module_t mod __unused, int type, void *data __unused)
437 if ((cpu_feature & CPUID_MSR) == 0) {
439 kprintf("cpuctl: not available.\n");
443 kprintf("cpuctl: access to MSR registers/cpuid info.\n");
444 cpuctl_devs = (struct cdev **)kmalloc(sizeof(void *) * ncpus,
445 M_CPUCTL, M_WAITOK | M_ZERO);
446 if (cpuctl_devs == NULL) {
447 DPRINTF("[cpuctl,%d]: cannot allocate memory\n",
451 for (cpu = 0; cpu < ncpus; cpu++)
452 cpuctl_devs[cpu] = make_dev(&cpuctl_cdevsw, cpu,
453 UID_ROOT, GID_KMEM, 0640, "cpuctl%d", cpu);
456 for (cpu = 0; cpu < ncpus; cpu++) {
457 if (cpuctl_devs[cpu] != NULL)
458 destroy_dev(cpuctl_devs[cpu]);
460 kfree(cpuctl_devs, M_CPUCTL);
470 DEV_MODULE(cpuctl, cpuctl_modevent, NULL);
471 MODULE_VERSION(cpuctl, CPUCTL_VERSION);