C-State Configuration

Intel® ISA Extensions

Use hardware-based isolation and memory encryption to provide more code protection in your solutions.

C-State Configuration

930 Views

Good day,

I'd like to configure C-States in one of our experimental OS's; we have a custom bootloader in which I'm trying to useMSR_PKG_CST_CONFIG_CONTROL (0x2E) (Table B-10).

Writing to that MSR causes an instant reboot. I do see that the CFG Lock bit 15 is set.

Is there some way to clear that bit and reconfigure C-States after the BIOS?

One engineer at ASUS mentioned that there might be a MSR to open the configuration space.

We are using ASUS P67 boards with i5 SandyBridge.

Thanks,

George

Link Copied

0 Replies

Community support is provided Monday to Friday. Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.