From b381d3827097675912c30f296bf6562ec5469089 Mon Sep 17 00:00:00 2001
From: Gabriel A <gab.dark.100@gmail.com>
Date: Sat, 20 Jul 2024 15:26:35 -0300
Subject: [PATCH] Implement IsSvcPermitted

---
 .../HOS/Kernel/Process/KProcess.cs            |  7 +++++--
 .../Kernel/Process/KProcessCapabilities.cs    | 14 +++++++++++--
 .../HOS/Kernel/SupervisorCall/Syscall.cs      | 20 +++++++++++++++++--
 3 files changed, 35 insertions(+), 6 deletions(-)

diff --git a/src/Ryujinx.HLE/HOS/Kernel/Process/KProcess.cs b/src/Ryujinx.HLE/HOS/Kernel/Process/KProcess.cs
index 26e859926d..8d2e53b1ca 100644
--- a/src/Ryujinx.HLE/HOS/Kernel/Process/KProcess.cs
+++ b/src/Ryujinx.HLE/HOS/Kernel/Process/KProcess.cs
@@ -509,12 +509,10 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
             return result;
         }
 
-#pragma warning disable CA1822 // Mark member as static
         private void GenerateRandomEntropy()
         {
             // TODO.
         }
-#pragma warning restore CA1822
 
         public Result Start(int mainThreadPriority, ulong stackSize)
         {
@@ -1172,5 +1170,10 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
             // TODO
             return false;
         }
+
+        public bool IsSvcPermitted(int svcId)
+        {
+            return Capabilities.IsSvcPermitted(svcId);
+        }
     }
 }
diff --git a/src/Ryujinx.HLE/HOS/Kernel/Process/KProcessCapabilities.cs b/src/Ryujinx.HLE/HOS/Kernel/Process/KProcessCapabilities.cs
index 314aadf36e..ca4bbcdb36 100644
--- a/src/Ryujinx.HLE/HOS/Kernel/Process/KProcessCapabilities.cs
+++ b/src/Ryujinx.HLE/HOS/Kernel/Process/KProcessCapabilities.cs
@@ -8,6 +8,8 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
 {
     class KProcessCapabilities
     {
+        private const int SvcMaskElementBits = 8;
+
         public byte[] SvcAccessMask { get; }
         public byte[] IrqAccessMask { get; }
 
@@ -22,7 +24,7 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
         public KProcessCapabilities()
         {
             // length / number of bits of the underlying type
-            SvcAccessMask = new byte[KernelConstants.SupervisorCallCount / 8];
+            SvcAccessMask = new byte[KernelConstants.SupervisorCallCount / SvcMaskElementBits];
             IrqAccessMask = new byte[0x80];
         }
 
@@ -208,7 +210,7 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
                                 return KernelResult.MaximumExceeded;
                             }
 
-                            SvcAccessMask[svcId / 8] |= (byte)(1 << (svcId & 7));
+                            SvcAccessMask[svcId / SvcMaskElementBits] |= (byte)(1 << (svcId % SvcMaskElementBits));
                         }
 
                         break;
@@ -324,5 +326,13 @@ namespace Ryujinx.HLE.HOS.Kernel.Process
 
             return mask << (int)min;
         }
+
+        public bool IsSvcPermitted(int svcId)
+        {
+            int index = svcId / SvcMaskElementBits;
+            int mask = (byte)(1 << (svcId % SvcMaskElementBits));
+
+            return (uint)svcId < KernelConstants.SupervisorCallCount && (SvcAccessMask[index] & mask) != 0;
+        }
     }
 }
diff --git a/src/Ryujinx.HLE/HOS/Kernel/SupervisorCall/Syscall.cs b/src/Ryujinx.HLE/HOS/Kernel/SupervisorCall/Syscall.cs
index 7c45a8fe13..0e7058304c 100644
--- a/src/Ryujinx.HLE/HOS/Kernel/SupervisorCall/Syscall.cs
+++ b/src/Ryujinx.HLE/HOS/Kernel/SupervisorCall/Syscall.cs
@@ -2225,6 +2225,22 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
                         break;
                     }
 
+                case InfoType.IsSvcPermitted:
+                    {
+                        if (handle != 0)
+                        {
+                            return KernelResult.InvalidHandle;
+                        }
+
+                        if (subId != 0x36)
+                        {
+                            return KernelResult.InvalidCombination;
+                        }
+
+                        value = KernelStatic.GetCurrentProcess().IsSvcPermitted((int)subId) ? 1UL : 0UL;
+                        break;
+                    }
+
                 case InfoType.MesosphereCurrentProcess:
                     {
                         if (handle != 0)
@@ -2232,7 +2248,7 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
                             return KernelResult.InvalidHandle;
                         }
 
-                        if ((ulong)subId != 0)
+                        if (subId != 0)
                         {
                             return KernelResult.InvalidCombination;
                         }
@@ -2247,7 +2263,7 @@ namespace Ryujinx.HLE.HOS.Kernel.SupervisorCall
                             return result;
                         }
 
-                        value = (ulong)outHandle;
+                        value = (uint)outHandle;
                         break;
                     }