28348225e5
- Turn off BTB (Branch Target Buffer) because the BTB makes system unstable on some machines. The BTB feature can be enabled if "options BTB_EN" is added in kernel a configuration file. - Change comment. - Reorder `orb XX,%al's. - Reset NMI F/F (mask NMI) before setting registers, and set it after setting them. Normally, this change has no effect.