int
cpuctl_ioctl(struct cdev *dev, u_long cmd, caddr_t data,
int flags, struct thread *td)
{
int cpu, ret;
cpu = dev2unit(dev);
if (cpu > mp_maxid || !cpu_enabled(cpu)) {
DPRINTF("[cpuctl,%d]: bad cpu number %d\n", __LINE__, cpu);
return (ENXIO);
}
/* Require write flag for "write" requests. */
if ((cmd == CPUCTL_MSRCBIT || cmd == CPUCTL_MSRSBIT ||
cmd == CPUCTL_UPDATE || cmd == CPUCTL_WRMSR ||
cmd == CPUCTL_EVAL_CPU_FEATURES) &&
(flags & FWRITE) == 0)
return (EPERM);
switch (cmd) {
case CPUCTL_RDMSR:
ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd, td);
break;
case CPUCTL_MSRSBIT:
case CPUCTL_MSRCBIT:
case CPUCTL_WRMSR:
ret = priv_check(td, PRIV_CPUCTL_WRMSR);
if (ret != 0)
goto fail;
ret = cpuctl_do_msr(cpu, (cpuctl_msr_args_t *)data, cmd, td);
break;
case CPUCTL_CPUID:
ret = cpuctl_do_cpuid(cpu, (cpuctl_cpuid_args_t *)data, td);
break;
case CPUCTL_UPDATE:
ret = priv_check(td, PRIV_CPUCTL_UPDATE);
if (ret != 0)
goto fail;
ret = cpuctl_do_update(cpu, (cpuctl_update_args_t *)data, td);
break;
case CPUCTL_CPUID_COUNT:
ret = cpuctl_do_cpuid_count(cpu,
(cpuctl_cpuid_count_args_t *)data, td);
break;
case CPUCTL_EVAL_CPU_FEATURES:
ret = cpuctl_do_eval_cpu_features(cpu, td);
break;
default:
ret = EINVAL;
break;
}
fail:
return (ret);
}
* Actually perform microcode update.
*/
static int
cpuctl_do_update(int cpu, cpuctl_update_args_t *data, struct thread *td)
{
cpuctl_cpuid_args_t args = {
.level = 0,
};
char vendor[13];
int ret;
KASSERT(cpu >= 0 && cpu < mp_ncpus,
("[cpuctl,%d]: bad cpu number %d", __LINE__, cpu));
DPRINTF("[cpuctl,%d]: XXX %d", __LINE__, cpu);
ret = cpuctl_do_cpuid(cpu, &args, td);
if (ret != 0) {
DPRINTF("[cpuctl,%d]: cannot retrive cpuid info for cpu %d",
__LINE__, cpu);
return (ENXIO);
}
((uint32_t *)vendor)[0] = args.data[1];
((uint32_t *)vendor)[1] = args.data[3];
((uint32_t *)vendor)[2] = args.data[2];
vendor[12] = '\0';
if (strncmp(vendor, INTEL_VENDOR_ID, sizeof(INTEL_VENDOR_ID)) == 0)
ret = update_intel(cpu, data, td);
else if(strncmp(vendor, AMD_VENDOR_ID, sizeof(AMD_VENDOR_ID)) == 0)
ret = update_amd(cpu, data, td);
else if(strncmp(vendor, CENTAUR_VENDOR_ID, sizeof(CENTAUR_VENDOR_ID)) == 0)
ret = update_via(cpu, data, td);