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build.py: Adjust AICPUPM comments

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Mykola Grymalyuk
2022-10-07 07:12:56 -06:00
parent 964697a2c1
commit 3e54e8ad7e
1 changed files with 15 additions and 3 deletions
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18
resources/build.py
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@@ -446,10 +446,22 @@ class BuildOpenCore:
shutil.copy(self.constants.windows_ssdt_path, self.constants.acpi_path)
# In macOS Ventura, Apple dropped AppleIntelCPUPowerManagement* kexts as they're unused on Haswell+
# However re-injecting the AICPUPM kexts is not enough, as Apple had 'intel_cpupm_matching' stripped from the kernel:
# https://github.com/apple-oss-distributions/xnu/blob/e7776783b89a353188416a9a346c6cdb4928faad/osfmk/i386/pal_routines.h#L153-L163
# However re-injecting the AICPUPM kexts is not enough, as Ventura changed how 'intel_cpupm_matching' is set:
# https://github.com/apple-oss-distributions/xnu/blob/e7776783b89a353188416a9a346c6cdb4928faad/osfmk/i386/pal_routines.h#L153-L163
#
# To resolve, AICPUPM.kext was modified to no longer check for the presence of 'intel_cpupm_matching'
# Specifically Apple has this logic for power management:
# - 0: Kext Based Power Management
# - 3: Kernel Based Power Management (For Haswell+ and Virtual Machines)
# - 4: Generic Virtual Machine Power Management
#
# Apple determines which to use by verifying whether 'plugin-type' exists in ACPI (with a value of 1 for Haswell, 2 for VMs)
# By default however, the plugin-type is not set, and thus the default value of '0' is used
# https://github.com/apple-oss-distributions/xnu/blob/e7776783b89a353188416a9a346c6cdb4928faad/osfmk/i386/pal_native.h#L62
#
# With Ventura, Apple no longer sets '0' as the default value, and instead sets it to '3'
# This breaks AppleIntelCPUPowerManagement.kext matching as it no longer matches against the correct criteria
#
# To resolve, we patched AICPUPM to attach regardless of the value of 'intel_cpupm_matching'
if smbios_data.smbios_dictionary[self.model]["CPU Generation"] <= cpu_data.cpu_data.ivy_bridge.value:
print("- Enabling legacy power management support")
self.enable_kext("AppleIntelCPUPowerManagement.kext", self.constants.aicpupm_version, self.constants.aicpupm_path)