History log of /src/sys/arch/x86/acpi/acpi_pdc.c
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# 1.2 20-Jun-2011 jruoho

branches: 1.2.2; 1.2.4;
Use acpi_match_cpu_handle() from acpi_util.c and only evaluate
the _PDC control method for CPUs that are enabled in the MADT.
# 1.1 12-Jun-2011 jruoho

Move the evaluation of the _PDC control method out from the acpicpu(4)
driver to the main acpi(4) stack. Follow Linux and evaluate it early.
Should fix PR port-amd64/42895, possibly also PR kern/42583, and many
other comparable bugs.

A common sense explanation is that Intel supplies additional CPU tables to
OEMs. BIOS writers do not bother to modify their DSDTs, but instead load
these extra tables dynamically as secondary SSDT tables. The actual Load()
happens when the _PDC method is invoked, and thus namespace errors occur
when the CPU-specific ACPI methods are not yet present but referenced in the
AML by various drivers, including, but not limited to, acpitz(4).