Monthly Archives: July 2014

Mavericks/Haswell Kernel Patch for Early Reboot


One of the big changes for mach_kernel in OS X Mavericks is the relocation of CPU power management into the kernel (for Haswell only). What used to happen in AppleIntelCPUPowerManagement.kext, now happens in the kernel. Since this kernel writes to potentially locked MSRs, this can be a problem for computers where the BIOS cannot be patched, or simply where the owner of the computer does not want to patch the BIOS. But since Apple did not include the code to XCPM (XNU CPU Power Management) in the sources provided for the 10.9 kernel, if you build mach_kernel from sources, the XCPM code and thus the code writing to locked MSRs is not included. I wrote about this initially when I discovered it while trying to get Mavericks running on a Haswell-based HP laptop. See here:

As mentioned in that post, my reason for building the kernel myself was to…

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