From 700d572732e9a11527bb61b88daa2a970f3b1bde Mon Sep 17 00:00:00 2001
From: TuxSH <tuxsh@sfr.fr>
Date: Wed, 8 Feb 2017 23:18:08 +0100
Subject: [PATCH] Stub svc 0x59

---
 source/firm.c    |  9 ++++++++-
 source/patches.c | 11 +++++++++++
 source/patches.h |  1 +
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/source/firm.c b/source/firm.c
index 5fb4037..8b8ccb6 100755
--- a/source/firm.c
+++ b/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
@@ -294,7 +301,7 @@ u32 patch1x2xNativeAndSafeFirm(u32 devMode)
         ret = 0;
 
     ret += ISN3DS ? patchFirmWrites(process9Offset, process9Size) : patchOldFirmWrites(process9Offset, process9Size);
-    
+
     ret += ISN3DS ? patchSignatureChecks(process9Offset, process9Size) : patchOldSignatureChecks(process9Offset, process9Size);
 
     if(devMode != 0)
diff --git a/source/patches.c b/source/patches.c
index 7b69ea4..def865d 100644
--- a/source/patches.c
+++ b/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;
diff --git a/source/patches.h b/source/patches.h
index 8e07a39..a4f0382 100644
--- a/source/patches.h
+++ b/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);