VideoCommon: Constrain the array_base registers

The array_base registers as part of CP state do not seem to incorporate
the upper bits in the physical address they try to access.

Source/Core/VideoCommon/CommandProcessor.cpp

@@ -138,12 +138,19 @@ void Init()
   et_UpdateInterrupts = CoreTiming::RegisterEvent("CPInterrupt", UpdateInterrupts_Wrapper);
 }
 
+u32 GetPhysicalAddressMask()
+{
+  // Physical addresses in CP seem to ignore some of the upper bits (depending on platform)
+  // This can be observed in CP MMIO registers by setting to 0xffffffff and then reading back.
+  return SConfig::GetInstance().bWii ? 0x1fffffff : 0x03ffffff;
+}
+
 void RegisterMMIO(MMIO::Mapping* mmio, u32 base)
 {
   constexpr u16 WMASK_NONE = 0x0000;
   constexpr u16 WMASK_ALL = 0xffff;
   constexpr u16 WMASK_LO_ALIGN_32BIT = 0xffe0;
-  const u16 WMASK_HI_RESTRICT = SConfig::GetInstance().bWii ? 0x1fff : 0x03ff;
+  const u16 WMASK_HI_RESTRICT = GetPhysicalAddressMask() >> 16;
 
   struct
   {

Source/Core/VideoCommon/CommandProcessor.h

@@ -169,4 +169,6 @@ void SetCpStatusRegister();
 
 void HandleUnknownOpcode(u8 cmd_byte, void* buffer, bool preprocess);
 
+u32 GetPhysicalAddressMask();
+
 }  // namespace CommandProcessor

Source/Core/VideoCommon/VertexLoaderManager.cpp

@@ -16,6 +16,7 @@
 #include "Core/HW/Memmap.h"
 
 #include "VideoCommon/BPMemory.h"
+#include "VideoCommon/CommandProcessor.h"
 #include "VideoCommon/DataReader.h"
 #include "VideoCommon/IndexGenerator.h"
 #include "VideoCommon/NativeVertexFormat.h"
@@ -347,7 +348,7 @@ void LoadCPReg(u32 sub_cmd, u32 value, bool is_preprocess)
 
   // Pointers to vertex arrays in GC RAM
   case 0xA0:
-    state->array_bases[sub_cmd & 0xF] = value;
+    state->array_bases[sub_cmd & 0xF] = value & CommandProcessor::GetPhysicalAddressMask();
     state->bases_dirty = true;
     break;