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PALcode

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In computing, on the DEC Alpha microprocessor, PALcode (Privileged Architecture Library code) is the name used by DEC for a set of functions in the SRM or AlphaBIOS firmware, providing a hardware abstraction layer for system software, covering features such as cache management, interrupt handling and exception handling.

PALcode also accesses internal functions specific to the particular Alpha processor implementation. It is thus somewhere between the role of microcode and of a hardware emulator.

PALcode is operating system-specific; different versions of PALcode are required by OpenVMS, Tru64 UNIX, and Windows NT. Tru64 UNIX PALcode is also used by NetBSD, FreeBSD, OpenBSD and Linux.

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