MSR_AMD_FSBASE
printf(fmt, "fsb", rdmsr(MSR_AMD_FSBASE), "gsb", rdmsr(MSR_AMD_GSBASE),
movl $MSR_AMD_FSBASE, %ecx; \
case REG_FSBASE: return (rdmsr(MSR_AMD_FSBASE));
PANICNVADD(pnv, "fsbase", rdmsr(MSR_AMD_FSBASE));
wrmsr(MSR_AMD_FSBASE, 0x200000000ul);
wrmsr(MSR_AMD_FSBASE, pcb->pcb_fsbase);