WOW64: Report CPU features based off of the emulated cpuid

Source/Windows/WOW64/Module.cpp

@@ -70,6 +70,8 @@ namespace {
   fextl::unique_ptr<FEX::DummyHandlers::DummySignalDelegator> SignalDelegator;
   fextl::unique_ptr<WowSyscallHandler> SyscallHandler;
 
+  SYSTEM_CPU_INFORMATION CpuInfo{};
+
   std::pair<NTSTATUS, TLS> GetThreadTLS(HANDLE Thread) {
     THREAD_BASIC_INFORMATION Info;
     const NTSTATUS Err = NtQueryInformationThread(Thread, ThreadBasicInformation, &Info, sizeof(Info), nullptr);
@@ -179,7 +181,7 @@ namespace Context {
       (State.flags[FEXCore::X86State::X87FLAG_C3_LOC] << 14);
     XSave->TagWord = State.AbridgedFTW;
 
-    Context->FloatSave.ControlWord = State.FCW;
+    Context->FloatSave.ControlWord = XSave->ControlWord;
     Context->FloatSave.StatusWord = XSave->StatusWord;
     Context->FloatSave.TagWord = FEXCore::FPState::ConvertFromAbridgedFTW(XSave->StatusWord, State.mm, XSave->TagWord);
     Context->FloatSave.ErrorOffset = XSave->ErrorOffset;
@@ -303,6 +305,39 @@ void BTCpuProcessInit() {
   CTX->SetSignalDelegator(SignalDelegator.get());
   CTX->SetSyscallHandler(SyscallHandler.get());
   CTX->InitCore(0, 0);
+
+  CpuInfo.ProcessorArchitecture = PROCESSOR_ARCHITECTURE_INTEL;
+
+  // Baseline FEX feature-set
+  CpuInfo.ProcessorFeatureBits = CPU_FEATURE_VME | CPU_FEATURE_TSC | CPU_FEATURE_CMOV | CPU_FEATURE_PGE |
+                                 CPU_FEATURE_PSE | CPU_FEATURE_MTRR | CPU_FEATURE_CX8 | CPU_FEATURE_MMX |
+                                 CPU_FEATURE_X86 | CPU_FEATURE_PAT | CPU_FEATURE_FXSR | CPU_FEATURE_SEP |
+                                 CPU_FEATURE_SSE | CPU_FEATURE_3DNOW | CPU_FEATURE_SSE2 | CPU_FEATURE_SSE3 |
+                                 CPU_FEATURE_CX128 | CPU_FEATURE_NX | CPU_FEATURE_SSSE3 | CPU_FEATURE_SSE41 |
+                                 CPU_FEATURE_PAE | CPU_FEATURE_DAZ;
+
+  // Features that require specific host CPU support
+  const auto CPUIDResult01 = CTX->RunCPUIDFunction(0x01, 0);
+  if (CPUIDResult01.ecx & (1 << 20)) {
+    CpuInfo.ProcessorFeatureBits |= CPU_FEATURE_SSE42;
+  }
+  if (CPUIDResult01.ecx & (1 << 27)) {
+    CpuInfo.ProcessorFeatureBits |= CPU_FEATURE_XSAVE;
+  }
+  if (CPUIDResult01.ecx & (1 << 28)) {
+    CpuInfo.ProcessorFeatureBits |= CPU_FEATURE_AVX;
+  }
+
+  const auto CPUIDResult07 = CTX->RunCPUIDFunction(0x07, 0);
+  if (CPUIDResult07.ebx & (1 << 5)) {
+    CpuInfo.ProcessorFeatureBits |= CPU_FEATURE_AVX2;
+  }
+
+  const auto FamilyIdentifier = CPUIDResult01.eax;
+  CpuInfo.ProcessorLevel = ((FamilyIdentifier >> 8) & 0xf) + ((FamilyIdentifier >> 20) & 0xff); // Family
+  CpuInfo.ProcessorRevision = (FamilyIdentifier & 0xf0000) >> 4; // Extended Model
+  CpuInfo.ProcessorRevision |= (FamilyIdentifier & 0xf0) << 4; // Model
+  CpuInfo.ProcessorRevision |= FamilyIdentifier & 0xf; // Stepping
 }
 
 NTSTATUS BTCpuThreadInit() {
@@ -387,3 +422,65 @@ void BTCpuSimulate() {
     Context::UnlockJITContext();
   }
 }
+
+BOOLEAN WINAPI BTCpuIsProcessorFeaturePresent(UINT Feature) {
+  switch (Feature) {
+    case PF_FLOATING_POINT_PRECISION_ERRATA:
+      return FALSE;
+    case PF_FLOATING_POINT_EMULATED:
+      return FALSE;
+    case PF_COMPARE_EXCHANGE_DOUBLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_CX8);
+    case PF_MMX_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_MMX);
+     case PF_XMMI_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_SSE);
+    case PF_3DNOW_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_3DNOW);
+    case PF_RDTSC_INSTRUCTION_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_TSC);
+    case PF_PAE_ENABLED:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_PAE);
+    case PF_XMMI64_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_SSE2);
+    case PF_SSE3_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_SSE3);
+    case PF_SSSE3_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_SSSE3);
+    case PF_XSAVE_ENABLED:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_XSAVE);
+    case PF_COMPARE_EXCHANGE128:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_CX128);
+    case PF_SSE_DAZ_MODE_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_DAZ);
+    case PF_NX_ENABLED:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_NX);
+    case PF_SECOND_LEVEL_ADDRESS_TRANSLATION:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_2NDLEV);
+    case PF_VIRT_FIRMWARE_ENABLED:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_VIRT);
+    case PF_RDWRFSGSBASE_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_RDFS);
+    case PF_FASTFAIL_AVAILABLE:
+      return TRUE;
+    case PF_SSE4_1_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_SSE41);
+    case PF_SSE4_2_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_SSE42);
+    case PF_AVX_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_AVX);
+    case PF_AVX2_INSTRUCTIONS_AVAILABLE:
+      return !!(CpuInfo.ProcessorFeatureBits & CPU_FEATURE_AVX2);
+    default:
+      LogMan::Msg::DFmt("Unknown CPU feature: {:X}", Feature);
+      return FALSE;
+  }
+}
+
+BOOLEAN BTCpuUpdateProcessorInformation(SYSTEM_CPU_INFORMATION *Info) {
+  Info->ProcessorArchitecture = CpuInfo.ProcessorArchitecture;
+  Info->ProcessorLevel = CpuInfo.ProcessorLevel;
+  Info->ProcessorRevision = CpuInfo.ProcessorRevision;
+  Info->ProcessorFeatureBits = CpuInfo.ProcessorFeatureBits;
+  return TRUE;
+}