Add firmware throttle patch

Closes https://github.com/dortania/OpenCore-Legacy-Patcher/issues/555

CHANGELOG.md

@@ -41,6 +41,7 @@
   - Mainly applicable for iMac12,x and iGPU-only MacBooks
 - Add EFICheckDisabler
   - Based off stripped RestrictEvents.kext
+- Add SimpleMSR to disable missing battery throttling on Nehalem+ MacBooks
 
 ## 0.2.5
 

README.md

@@ -65,6 +65,8 @@ Nightly builds can be found here courteous of nightly.link:
   * Development of previous patchers, laying out much of what needs to be patched
 * [mario_bros_tech](https://github.com/mariobrostech) and the rest of the Unsupported Mac Discord
   * Catalyst that started OpenCore Legacy Patcher
+* [arter97](https://github.com/arter97/)
+  * [SimpleMSR](https://github.com/arter97/SimpleMSR/) to disable firmware throttling in Nehalem+ MacBooks without batteries
 * MacRumors and Unsupported Mac Communities
   * Endless testing, reporting issues
 * Apple

payloads/Config/config.plist

@@ -976,7 +976,7 @@
 				<key>BundlePath</key>
 				<string>CSLVFixup.kext</string>
 				<key>Comment</key>
-				<string>Fix Music.app</string>
+				<string>Fix Music</string>
 				<key>Enabled</key>
 				<false/>
 				<key>ExecutablePath</key>
@@ -988,6 +988,24 @@
 				<key>PlistPath</key>
 				<string>Contents/Info.plist</string>
 			</dict>
+			<dict>
+				<key>Arch</key>
+				<string>x86_64</string>
+				<key>BundlePath</key>
+				<string>SimpleMSR.kext</string>
+				<key>Comment</key>
+				<string>Disable firmware based battery throttling</string>
+				<key>Enabled</key>
+				<false/>
+				<key>ExecutablePath</key>
+				<string>Contents/MacOS/SimpleMSR</string>
+				<key>MaxKernel</key>
+				<string></string>
+				<key>MinKernel</key>
+				<string></string>
+				<key>PlistPath</key>
+				<string>Contents/Info.plist</string>
+			</dict>
 		</array>
 		<key>Block</key>
 		<array/>

resources/build.py

@@ -722,6 +722,11 @@ class BuildOpenCore:
             self.get_item_by_kv(self.config["Kernel"]["Patch"], "Identifier", "com.apple.filesystems.apfs")["Enabled"] = True
             # Lets us check in sys_patch.py if config supports FileVault
             self.config["NVRAM"]["Add"]["4D1FDA02-38C7-4A6A-9CC6-4BCCA8B30102"]["OCLP-Settings"] += " -allow_fv"
+        if self.constants.disable_msr_power_ctl is True and self.model.startswith("MacBook"):
+            print("- Disabling Battery Throttling")
+            if smbios_data.smbios_dictionary[self.model]["CPU Generation"] >= cpu_data.cpu_data.nehalem.value:
+                # Nehalem and newer MacBooks force firmware throttling via MSR_POWER_CTL
+                self.enable_kext("SimpleMSR.kext", self.constants.simplemsr_version, self.constants.simplemsr_path)
         if self.get_kext_by_bundle_path("RestrictEvents.kext")["Enabled"] is False:
             # Ensure this is done at the end so all previous RestrictEvents patches are applied
             # RestrictEvents and EFICheckDisabler will confilict if both are injected

resources/cli_menu.py

@@ -677,6 +677,35 @@ for Windows may prefer to only work with the dGPU and eGPU active.
             print("Returning to previous menu")
         else:
             self.dGPU_switch_support()
+    
+    def set_battery_throttle(self):
+        utilities.cls()
+        utilities.header(["Disable Firmware Throttling"])
+        print(
+            """
+By default on Nehalem and newer Macs, the firmware will throttle if
+the battery is either dead or missing. The firmware will set
+'BD PROCHOT' to notify the OS the machine needs to run in an extreme
+low power mode.
+
+Enabling this option will patch 'MSR_POWER_CTL' to be unset allowing
+proper CPU behaviour as if battery is present. Note that this can cause
+instability in situations where the CPU is being taxed and pulls more 
+power than the PSU can supply.
+
+Note: Only supported on Nehalem and newer MacBooks (2010+)
+        """
+        )
+
+        change_menu = input("Disable Firmware Throttling?(y/n/q): ")
+        if change_menu in {"y", "Y", "yes", "Yes"}:
+            self.constants.disable_msr_power_ctl = True
+        elif change_menu in {"n", "N", "no", "No"}:
+            self.constants.disable_msr_power_ctl = False
+        elif change_menu in {"q", "Q", "Quit", "quit"}:
+            print("Returning to previous menu")
+        else:
+            self.set_battery_throttle()
 
     def set_surplus(self):
         utilities.cls()
@@ -919,6 +948,7 @@ system_profiler SPHardwareDataType | grep 'Model Identifier'
                     f"Set Windows GMUX support:\tCurrently {self.constants.dGPU_switch}",
                     MenuOptions(self.constants.custom_model or self.constants.computer.real_model, self.constants).dGPU_switch_support,
                 ],
+                [f"Disable Battery Throttling:\tCurrently {self.constants.disable_msr_power_ctl}", MenuOptions(self.constants.custom_model or self.constants.computer.real_model, self.constants).set_battery_throttle],
             ]
 
             for option in options:

resources/constants.py

@@ -72,6 +72,10 @@ class Constants:
         ## https://github.com/cdf/Innie
         self.innie_version = "1.3.0"  # Innie
 
+        ## arter97
+        ## https://github.com/arter97/SimpleMSR/
+        self.simplemsr_version = "1.0.0"  # SimpleMSR
+
         # Get resource path
         self.current_path = Path(__file__).parent.parent.resolve()
         self.payload_path = self.current_path / Path("payloads")
@@ -140,13 +144,14 @@ class Constants:
         self.allow_ts2_accel = True  # Set TeraScale 2 Acceleration support
 
         ## Miscellaneous
-        self.disallow_cpufriend = False  #   Disable CPUFriend
-        self.enable_wake_on_wlan = False  #  Allow Wake on WLAN for modern Broadcom
-        self.disable_tb = False  #  Disable Thunderbolt Controller
-        self.set_alc_usage = True  #         Set AppleALC usage
-        self.dGPU_switch = True  #           Set Display GPU Switching for Windows
-        self.force_surplus = False  #        Force SurPlus patch in newer OSes
-        self.force_latest_psp = False  #     Force latest PatcherSupportPkg
+        self.disallow_cpufriend = False  #    Disable CPUFriend
+        self.enable_wake_on_wlan = False  #   Allow Wake on WLAN for modern Broadcom
+        self.disable_tb = False  #            Disable Thunderbolt Controller
+        self.set_alc_usage = True  #          Set AppleALC usage
+        self.dGPU_switch = True  #            Set Display GPU Switching for Windows
+        self.force_surplus = False  #         Force SurPlus patch in newer OSes
+        self.force_latest_psp = False  #      Force latest PatcherSupportPkg
+        self.disable_msr_power_ctl = False  # Disable MSR Power Control (missing battery throttling)
 
         # OS Versions
         ## Based off Major Kernel Version
@@ -325,6 +330,10 @@ class Constants:
     @property
     def innie_path(self):
         return self.payload_kexts_path / Path(f"Misc/Innie-v{self.innie_version}.zip")
+    
+    @property
+    def simplemsr_path(self):
+        return self.payload_kexts_path / Path(f"Misc/SimpleMSR-v{self.simplemsr_version}.zip")
 
     @property
     def latebloom_path(self):