HostFeatures: Pull MMFR3 identification register

This has the S1POE flag that we will want to use in the future.

Source/Common/HostFeatures.cpp

@@ -1,6 +1,9 @@
 // SPDX-License-Identifier: MIT
 #include "Common/CPUInfo.h"
 #include "Common/HostFeatures.h"
+#ifndef _WIN32
+#include "Common/Linux/LinuxVersion.h"
+#endif
 
 #include <FEXCore/Config/Config.h>
 #include <FEXCore/Core/HostFeatures.h>
@@ -69,7 +72,8 @@ GetSysReg(MIDR_EL1, MIDR_EL1);
 GetSysReg(ISAR1_EL1, ID_AA64ISAR1_EL1);
 GetSysReg(MMFR0_EL1, ID_AA64MMFR0_EL1);
 GetSysReg(MMFR2_EL1, ID_AA64MMFR2_EL1);
-GetSysReg(ZFR0_EL1, s3_0_c0_c4_4); // Can't request by name
+GetSysReg(MMFR3_EL1, s3_0_c0_c7_3); // Can't request by name
+GetSysReg(ZFR0_EL1, s3_0_c0_c4_4);  // Can't request by name
 GetSysReg(MMFR1_EL1, ID_AA64MMFR1_EL1);
 GetSysReg(ISAR2_EL1, ID_AA64ISAR2_EL1);
 GetSysReg(DCZID_EL0, DCZID_EL0);
@@ -84,6 +88,12 @@ public:
     ISAR1.SetReg(Get_ISAR1_EL1());
     MMFR0.SetReg(Get_MMFR0_EL1());
     MMFR2.SetReg(Get_MMFR2_EL1());
+#ifndef _WIN32
+    if (FEX::LinuxVersion::CalculateHostKernelVersion() >= FEX::LinuxVersion::KernelVersion(6, 5)) {
+      // Only exists in kernel 6.5 and newer.
+      MMFR3.SetReg(Get_MMFR3_EL1());
+    }
+#endif
     MMFR1.SetReg(Get_MMFR1_EL1());
     ISAR2.SetReg(Get_ISAR2_EL1());
     DCZID.SetReg(Get_DCZID_EL0());
@@ -158,6 +168,8 @@ public:
         MMFR1.SetReg(ValueHex);
       } else if (Key == "mmfr2") {
         MMFR2.SetReg(ValueHex);
+      } else if (Key == "mmfr3") {
+        MMFR3.SetReg(ValueHex);
       } else if (Key == "zfr0") {
         ZFR0.SetReg(ValueHex);
       } else if (Key == "dczid") {

Source/Common/HostFeatures.h

@@ -101,6 +101,8 @@ public:
     SVE_F64MM,
     // MMFR1
     AFP,
+    // MMFR3
+    S1POE,
     // ISAR2
     WFxt,
     RPRES,
@@ -148,6 +150,7 @@ public:
     MMFR2_EL1,
     ZFR0_EL1,
     MMFR1_EL1,
+    MMFR3_EL1,
     ISAR2_EL1,
   };
 
@@ -559,6 +562,30 @@ public:
     };
   };
 
+  class MMFR3Reg final : public FeatureReg {
+  public:
+    FIELD_FETCHER(S1POE, S1POE, 0b0001);
+
+  private:
+    enum Field {
+      TCRX = 0 * 4,
+      SCTLRX = 1 * 4,
+      S1PIE = 2 * 4,
+      S2PIE = 3 * 4,
+      S1POE = 4 * 4,
+      S2POE = 5 * 4,
+      AIE = 6 * 4,
+      MEC = 7 * 4,
+      D128 = 8 * 4,
+      D128_2 = 9 * 4,
+      SNERR = 10 * 4,
+      ANERR = 11 * 4,
+      SDERR = 13 * 4,
+      ADERR = 14 * 4,
+      SPEC_FPACC = 15 * 4,
+    };
+  };
+
   class ISAR2Reg final : public FeatureReg {
   public:
     FIELD_FETCHER(WFxt, WFxt, 0b0010);
@@ -621,6 +648,7 @@ public:
   ZFR0Reg ZFR0;
   MMFR2Reg MMFR2;
   MMFR1Reg MMFR1;
+  MMFR3Reg MMFR3;
   ISAR2Reg ISAR2;
   DCZIDReg DCZID;
   SVEVLReg SVEVL;

Source/Tools/FEXGetConfig/Main.cpp

@@ -485,6 +485,7 @@ int main(int argc, char** argv, char** envp) {
     features += fmt::format("mmfr0=0x{:x},", Features.MMFR0.Get());
     features += fmt::format("mmfr1=0x{:x},", Features.MMFR1.Get());
     features += fmt::format("mmfr2=0x{:x},", Features.MMFR2.Get());
+    features += fmt::format("mmfr3=0x{:x},", Features.MMFR3.Get());
     features += fmt::format("zfr0=0x{:x},", Features.ZFR0.Get());
     features += fmt::format("dczid=0x{:x},", Features.DCZID.Get());
     features += fmt::format("svevl=0x{:x}", Features.SVEVL.Get());