diff options
Diffstat (limited to 'src/soc/intel/apollolake/cpu.c')
| -rw-r--r-- | src/soc/intel/apollolake/cpu.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/soc/intel/apollolake/cpu.c b/src/soc/intel/apollolake/cpu.c index 949736821e..8b8f963e4c 100644 --- a/src/soc/intel/apollolake/cpu.c +++ b/src/soc/intel/apollolake/cpu.c @@ -53,6 +53,13 @@ static const struct reg_script core_msr_script[] = { REG_SCRIPT_END }; +static void enable_untrusted_mode(void) +{ + msr_t msr = rdmsr(MSR_POWER_MISC); + msr.lo |= ENABLE_IA_UNTRUSTED; + wrmsr(MSR_POWER_MISC, msr); +} + static void soc_core_init(device_t cpu) { /* Set core MSRs */ @@ -63,6 +70,8 @@ static void soc_core_init(device_t cpu) * implemented in microcode. */ enable_pm_timer_emulation(); + /* Drop privilege level */ + enable_untrusted_mode(); } static struct device_operations cpu_dev_ops = { |