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DirectHW is a software compatibility layer for Mac OS X. It provides a kernel driver and framework that emulates the most commonly used hardware access functions on x86 machines, such as:

  • iopl
  • inb, inw, inl, outb, outw, outl
  • rdmsr, wrmsr
  • mmap() of physical address space

This package was originally intended to get coreboot utilities running on Mac OS X. You're encouraged to use it for many more opportunities.

Note: Intel Mac required. Windows version being prepared.


DirectHW is free software and released under the license ISC-L.


Download URLs for DirectHW can be found on

Obsolete Versions

Download DirectHW 1.0 (2008/11/16): [ DMG | Source ]