Stub svc 0x59

source/firm.c

@@ -172,6 +172,13 @@ u32 patchNativeFirm(u32 firmVersion, FirmwareSource nandType, u32 emuHeader, boo
         ret += reimplementSvcBackdoor(arm11Section1, arm11SvcTable, baseK11VA, &freeK11Space);
     }
 
+    //11.3 FIRM patches
+    if(firmVersion >= (ISN3DS ? 0x2D : 0x5C))
+    {
+        //Stub svc 0x59
+        ret += stubSvcRestrictGpuDma(arm11Section1, arm11SvcTable, baseK11VA);
+    }
+
     ret += implementSvcGetCFWInfo(arm11Section1, arm11SvcTable, baseK11VA, &freeK11Space, isSafeMode);
 
     //Apply UNITINFO patches

source/patches.c

@@ -283,6 +283,17 @@ u32 reimplementSvcBackdoor(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA, u8 **free
     return 0;
 }
 
+u32 stubSvcRestrictGpuDma(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA)
+{
+    if(arm11SvcTable[0x59] != 0)
+    {
+        u32 *off = (u32 *)(pos + arm11SvcTable[0x59] - baseK11VA);
+        off[1] = 0xE1A00000; //replace call to inner function by a NOP
+    }
+
+    return 0;
+}
+
 u32 implementSvcGetCFWInfo(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA, u8 **freeK11Space, bool isSafeMode)
 {
     if(*(u32 *)(*freeK11Space + svcGetCFWInfo_bin_size - 4) != 0xFFFFFFFF) return 1;

source/patches.h

@@ -46,6 +46,7 @@ u32 patchZeroKeyNcchEncryptionCheck(u8 *pos, u32 size);
 u32 patchNandNcchEncryptionCheck(u8 *pos, u32 size);
 u32 patchCheckForDevCommonKey(u8 *pos, u32 size);
 u32 reimplementSvcBackdoor(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA, u8 **freeK11Space);
+u32 stubSvcRestrictGpuDma(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA);
 u32 implementSvcGetCFWInfo(u8 *pos, u32 *arm11SvcTable, u32 baseK11VA, u8 **freeK11Space, bool isSafeMode);
 u32 patchArm9ExceptionHandlersInstall(u8 *pos, u32 size);
 u32 getInfoForArm11ExceptionHandlers(u8 *pos, u32 size, u32 *codeSetOffset);