diff options
| -rw-r--r-- | src/cpu/amd/model_10xxx/model_10xxx_init.c | 34 |
1 files changed, 25 insertions, 9 deletions
diff --git a/src/cpu/amd/model_10xxx/model_10xxx_init.c b/src/cpu/amd/model_10xxx/model_10xxx_init.c index c17f335334..590b89d65e 100644 --- a/src/cpu/amd/model_10xxx/model_10xxx_init.c +++ b/src/cpu/amd/model_10xxx/model_10xxx_init.c @@ -99,15 +99,31 @@ static void model_10xxx_init(device_t dev) msr.hi &= ~(1 << (35-32)); wrmsr(BU_CFG2_MSR, msr); - /* Set SMM base address for this CPU */ - msr = rdmsr(SMM_BASE_MSR); - msr.lo = SMM_BASE - (lapicid() * 0x400); - wrmsr(SMM_BASE_MSR, msr); - - /* Enable the SMM memory window */ - msr = rdmsr(SMM_MASK_MSR); - msr.lo |= (1 << 0); /* Enable ASEG SMRAM Range */ - wrmsr(SMM_MASK_MSR, msr); + if (IS_ENABLED(CONFIG_HAVE_SMI_HANDLER)) { + printk(BIOS_DEBUG, "Initializing SMM ASeg memory\n"); + + /* Set SMM base address for this CPU */ + msr = rdmsr(SMM_BASE_MSR); + msr.lo = SMM_BASE - (lapicid() * 0x400); + wrmsr(SMM_BASE_MSR, msr); + + /* Enable the SMM memory window */ + msr = rdmsr(SMM_MASK_MSR); + msr.lo |= (1 << 0); /* Enable ASEG SMRAM Range */ + wrmsr(SMM_MASK_MSR, msr); + } else { + printk(BIOS_DEBUG, "Disabling SMM ASeg memory\n"); + + /* Set SMM base address for this CPU */ + msr = rdmsr(SMM_BASE_MSR); + msr.lo = SMM_BASE - (lapicid() * 0x400); + wrmsr(SMM_BASE_MSR, msr); + + /* Disable the SMM memory window */ + msr.hi = 0x0; + msr.lo = 0x0; + wrmsr(SMM_MASK_MSR, msr); + } /* Set SMMLOCK to avoid exploits messing with SMM */ msr = rdmsr(HWCR_MSR); |