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302 lines
9.9 KiB
Markdown
302 lines
9.9 KiB
Markdown
# Explaining the patches in OpenCore Legacy Patcher
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In our patcher, there are numerous patches used to ensure a stable system. Here we're going to go over what patches are used and why we recommend or even require them.
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* [OpenCore Settings](#opencore-settings)
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* [Injected Kexts](#injected-kexts)
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* [On-Disk Patches](#on-disk-patches)
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## OpenCore Settings
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Below is a run down of the main logic OpenCore Legacy Patcher uses to gain native support in macOS. Note OpenCore's configuration is documented within [OpenCorePkg](https://github.com/acidanthera/OpenCorePkg) as well as an online version provided by us:
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* [OpenCorePkg Online Docs](https://dortania.github.io/docs/latest/Configuration.html)
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::: details Configuration Explanation
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### ACPI -> Patch
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* EHCx and XHC1 Patches
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* Reason: Required for proper USB operation
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* Logic: Avoids USB maps of newer models attaching and breaking USB port functionality
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* Models: All models require
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### Booter -> Quirks
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* ForceBooterSignature
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* Reason: Required to ensure Hibernation support
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* Logic: Tricks boot.efi into thinking OpenCore is Apple's firmware
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* Models: All models require
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### DeviceProperties -> Add
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* `PciRoot(0x0)/Pci(0x15,0x0)/Pci(0x0,0x0)`
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* `PciRoot(0x0)/Pci(0x1C,0x4)/Pci(0x0,0x0)`
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* `PciRoot(0x0)/Pci(0x1C,0x3)/Pci(0x0,0x0)`
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* `PciRoot(0x0)/Pci(0x1C,0x5)/Pci(0x0,0x0)`
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* `PciRoot(0x0)/Pci(0x1C,0x1)/Pci(0x0,0x0)`
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* Reason: Required to ensure Wifi works with full, native support
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* Logic: Tricks AirPortBrcmNIC.kext into thinking our device is a BCM94360 (`14e4,43ba`)
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* Models: Machines with BCM943224 and BCM94331 chipsets
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* `PciRoot(0x0)/Pci(0x3,0x0)/Pci(0x0,0x0)`
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* `PciRoot(0x0)/Pci(0x1,0x0)/Pci(0x0,0x0)`
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* Reason: Required to ensure Brightness Control works on upgraded iMacs
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* Logic: Sets AppleBackLight properties
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* Models: iMac11,x and iMac12,x with upgraded Nvidia Metal GPUs
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* `PciRoot(0x0)/Pci(0x2,0x0)`
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* Reason: Disables internal GPU to fix sleep issues on upgrades iMacs
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* Logic: Tricks macOS into thinking iGPU is a generic PCI device
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* Models: iMac12,x with upgraded Metal GPUs
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### Kernel -> Patch
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* SMC Patch
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* Reason: Required to avoid SMC Firmware updates
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* Logic: Patches out `smc-version` in AppleSMC.kext, requires SMC-Spoof.kext for full functionality
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* Models: All models require
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* IOHIDFamily Patch
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* Reason: Required for HID peripheral support in macOS on older hardware
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* Logic: Tricks IOHIDFamily into thinking it's always booting recovery
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* Models: [2010 and older](https://github.com/dortania/OpenCore-Legacy-Patcher/blob/79ab028b0a039e97a528e0b99c876d95d9c2d41d/Resources/ModelArray.py#L310-L332)
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### Kernel -> Quirks
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* ThridPartyDrives
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* Reason: Required to avoid Hibernation wake issues on 3rd party drives
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* Logic: Patches AppleAHCIPort.kext into support
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* Models: All models with standard SATA ports
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* PanicNoKextDump
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* Reason: Avoids kext dump on kernel panics, easier kernel debugging
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* Logic: Patches Kernel to not dump dump unnecessary info
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* Models: Only set when Verbose Boot is enabled by the user
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### Misc -> Security
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* SecureBootModel
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* Reason: Required to ensure seamless OS updates with Big Sur
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* Logic: Sets iMacPro1,1's Secure Enclave Identifier (j137)
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* Models: All models require
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### NVRAM -> Add
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* `-v debug=0x100`
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* Reason: Used to see debug info of macOS's kernel and kexts, and avoids reboots on panic
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* Logic: Adds args to NVRAM
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* Models: Only set when Verbose Boot is enabled by the user
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* `-liludbgall`
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* Reason: Enables Lilu and plugin debug logging
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* Logic: Adds args to NVRAM
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* Models: Only set when Kext DEBUG is enabled by the user
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* `msgbuf=1048576`
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* Reason: Sets message buffer size to 1MB, ensures boot logs are retained
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* Logic: Adds args to NVRAM
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* Models: Only set when Kext DEBUG is enabled by the user
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* `agdpmod=pikera`
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* Reason: Fixes GPU switching on MacBookPro9,x
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* Logic: Adds args to NVRAM
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* Models: MacBookPro9,x
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* `shikigva=80 unfairgva=1`
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* `shikigva=128 unfairgva=1 -wegtree`
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* Reason: Fixes DRM support on models with upgraded AMD Metal GPUs
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* Logic: Adds args to NVRAM
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* Models: Models with upgraded AMD Metal GPUs
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### UEFI -> ProtocolOverrides
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* GopPassThrough
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* Reason: Used for proper output on machines with UGA firmware but GOP GPU
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* Logic: Provide GOP protocol instances on top of UGA protocol instances
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* Models: MacPro3,1, MacBook4,1 iMac7,1-8,1
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:::
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## Injected Kext
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Below is an explanation of what Kexts OpenCore Legacy Patcher will inject into memory on boot-up.
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::: details Injected Kext Explanation
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### Acidanthera
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* Lilu
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* Reason: Patching engine for other kexts
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* Models: All models require
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* WhateverGreen
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* Reason: Patches GPU Frameworks and kext to ensure proper support
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* Models: All models require
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* CPUFriend
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* Reason: Patches IOx86PlatformPlugin to restore previous CPU profiles
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* Models: 2012 and newer models
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* AirportBrcmFixup
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* Reason: Patches IO80211 and co to fix networking support for unsupported cards
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* Models: BCM943224 and BCM94331
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* RestrictEvents
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* Reason: Disables memory errors on MacPro7,1
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* Models: Mac Pros and Xserves
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### Ethernet
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* nForceEthernet
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* Reason: Inject old Nvidia Ethernet kext to resolve networking in Catalina and newer
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* Models: 2010 and older Nvidia Ethernet require
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* MarvelYukonEthernet
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* Reason: Inject old Marvel Ethernet kext to resolve networking in Catalina and newer
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* Models: 2008 and older Marvel Ethernet require
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* CatalinaBCM5701Ethernet
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* Reason: Inject old Broadcom Ethernet kext to resolve networking in Big Sur
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* Logic: Patch out conflicting symbols to not colide existing BCM5701Ethernet
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* Models: 2011 and older Broadcom Ethernet require
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### Maps
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* USBMap
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* Reason: Inject old USB map profiles to fix USB
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* Models: All models require
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### SSE
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* AAMouSSE
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* Reason: Translates SSE4.2 instructions to compatible code for SSE4,1 CPUs, required for AMD Metal drives
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* Models: MacPro3,1
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* telemetrap
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* Reason: Ensures temelemtry.plugin doesn't run, required for SSE4,1 CPUs
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* Models: Penryn CPUs
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### Wifi
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* IO80211HighSierra
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* Reason: Re-inject Atheros wifi drivers from High Sierra
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* Logic: Patch out conflicting symbols to not colide existing IO80211Family
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* Models: Atheros cards
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* IO80211Mojave
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* Reason: Re-inject Broadcom wifi drivers from Mojave
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* Logic: Patch out conflicting symbols to not colide existing IO80211Family
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* Models: BCM94322
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### Misc
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* AppleBackLightFixup
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* Reason: Patch AppleBacklight for iMacs with Nvidia Metal GPU upgrades
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* Models: iMac11,x, iMac12,x with upgraded Nvidia Metal GPUs
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* AppleIntelPIIXATA
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* Reason: Fix IDE support on MacPro3,1
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* Models: MacPro3,1
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* AppleIntelMCEDisabler
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* Reason: Fix dual socket support in Catalina and newer
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* Models: Mac Pros and Xserves
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* NightShiftEnabler
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* Reason: Enables NightShift support on unsupported models
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* Models: 2011 and older, MacBookPro9,x included
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* SMC-Spoof
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* Reason: Spoofs SMC version to 9.9999
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* Models: All models require
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:::
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## On-Disk Patches
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Unfortunately certain on-disk patches are required to achieve full functionality. Below is a breakdown of patches supported
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Note, GPU Acceleration Patches are not public yet, the below section is simply documentation for easier research with new aids.
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::: details Audio Patches
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### Extensions
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* AppleHDA
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* Reason: Re-add High Sierra's AppleHDA to achieve audio support
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* Models: 2011 and older Macs (excluding MacPro4,1+)
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:::
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::: details Acceleration Patches
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### Extensions
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#### General Patches
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* IOSurface.kext
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* Reason: Fixes immediate logout on login
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* Logic: Downgrade to Catalina IOSurface
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* Note: For AMD and Intel, additional `addMemoryRegion/removeMemoryRegion` patch added changing the first conditional jump to non conditional jump
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* At Offset `0xdb52` and `0xdbc6`, replace following bytes with `0xeb`
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#### Dropped Acceleration Binaries
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* Nvidia Binaries
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* GeForceGA.bundle
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* GeForceTesla.kext
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* Skip IOFree Panic - Mojave+
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* At Offset `0x5CF9A` replace following bytes with `0xEB`
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* Avoids `addMemoryRegion/removeMemoryRegion` calls
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* At Offset `0x5527` and `0x77993`, replace following bytes with `0x909090909090`
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* GeForceTeslaGLDriver.bundle
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* GeForceTeslaVADriver.bundle
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* NVDANV50HalTesla.kext
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* NVDAResmanTesla.kext
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* 0x1ea59a - 0x1ea5b3: nop
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* Replace VSLGestalt to IOLockLock or any other known symbol of the same length.
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* AMD/ATI Binaries
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* AMD2400Controller.kext
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* AMD2600Controller.kext
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* AMD3800Controller.kext
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* AMD4600Controller.kext
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* AMD4800Controller.kext
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* AMD5000Controller.kext
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* AMD6000Controller.kext
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* AMDFramebuffer.kext
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* AMDLegacyFramebuffer.kext
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* AMDLegacySupport.kext
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* AMDRadeonVADriver.bundle
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* AMDRadeonVADriver2.bundle
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* AMDRadeonX3000.kext
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* AMDRadeonX3000GLDriver.bundle
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* AMDShared.bundle
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* AMDSupport.kext
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* ATIRadeonX2000.kext
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* ATIRadeonX2000GA.plugin
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* ATIRadeonX2000GLDriver.bundle
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* ATIRadeonX2000VADriver.bundle
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* Intel 5th Gen Binaries
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* AppleIntelFramebufferAzul.kext
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* AppleIntelFramebufferCapri.kext
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* AppleIntelHDGraphics.kext
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* AppleIntelHDGraphicsFB.kext
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* AppleIntelHDGraphicsGA.plugin
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* AppleIntelHDGraphicsGLDriver.bundle
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* AppleIntelHDGraphicsVADriver.bundle
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* Intel 6th Gen Binaries
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* AppleIntelHD3000Graphics.kext
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* AppleIntelHD3000GraphicsGA.plugin
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* AppleIntelHD3000GraphicsGLDriver.bundle
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* AppleIntelHD3000GraphicsVADriver.bundle
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* AppleIntelSNBGraphicsFB.kext
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* Board ID Patch
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* Replace original Board ID with updated model
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* AppleIntelSNBVA.bundle
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### Frameworks
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* CoreDisplay.framework
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* Logic: Copied from Mojave, heavy modifications/shims
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* IOSurface.framework
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* OpenGL.framework
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* Logic: Copied from Mojave
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### PrivateFrameworks
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* GPUSupport.framework
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* Logic: Copied from Mojave
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* SkyLight.framework
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* Logic: Copied from Mojave, heavy modifications/shims
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### LaunchDaemons
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* HiddHack.plist
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* Reason: Fixes unresponsive input when patching Skylight
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* Logic: Forces `hidd` to register events, as Skylight handles them by default in Big Sur
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:::
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