ocvalidate: Add check for UIScale

Utilities/ocvalidate/README.md

@@ -111,7 +111,7 @@ Utility to validate whether a `config.plist` matches requirements and convention
 - When `AudioSupport` is enabled, AudioDevice cannot be empty and must be a valid path.
 #### Quirks
 - When `RequestBootVarRouting` is enabled, `OpenRuntime.efi` should be loaded in `UEFI->Drivers`.
-- `ResizeGpuBars` must be set to an integer value between `-1` or `19`.
+- `ResizeGpuBars` must be set to an integer value between `-1` and `19`.
 #### Drivers
 - When `OpenUsbKbDxe.efi` is in use, `KeySupport` in `UEFI->Input` should never be enabled altogether.
 - When `Ps2KeyboardDxe.efi` is in use, `KeySupport` in `UEFI->Input` should always be enabled altogether.
@@ -124,5 +124,6 @@ Utility to validate whether a `config.plist` matches requirements and convention
 #### Output
 - `ClearScreenOnModeSwitch`, `IgnoreTextInGraphics`, `ReplaceTabWithSpace`, and `SanitiseClearScreen` only apply to `System` TextRenderer
 - `Resolution` should match `NUMBERxNUMBER` or `NUMBERxNUMBER@NUMBER` sequences (unless it is an `Empty string` or is set to `Max`).
+- `UIScale` must be set to an integer value between `-1` and `2`.
 #### ReservedMemory
 - Type: Only `Reserved`, `LoaderCode`, `LoaderData`, `BootServiceCode`, `BootServiceData`, `RuntimeCode`, `RuntimeData`, `Available`, `Persistent`, `UnusableMemory`, `ACPIReclaimMemory`, `ACPIMemoryNVS`, `MemoryMappedIO`, `MemoryMappedIOPortSpace`, or `PalCode` are accepted.

Utilities/ocvalidate/ValidateUEFI.c

@@ -424,6 +424,7 @@ CheckUEFIOutput (
   UINT32               UserHeight;
   UINT32               UserBpp;
   BOOLEAN              UserSetMax;
+  INT8                 UIScale;
 
   ErrorCount           = 0;
   UserUefi             = &Config->Uefi;
@@ -516,6 +517,12 @@ CheckUEFIOutput (
     ++ErrorCount;
   }
 
+  UIScale = UserUefi->Output.UIScale;
+  if (UIScale < -1 || UIScale > 2) {
+    DEBUG ((DEBUG_WARN, "UEFI->Output->UIScale is borked (Can only be between -1 and 2)!\n"));
+    ++ErrorCount;
+  }
+
   return ErrorCount;
 }