5 files changed, 29 insertions, 4 deletions
diff --git a/src/core/hle/kernel/svc.cpp b/src/core/hle/kernel/svc.cpp
index b8b6b4d49..f287f7c97 100644
--- a/src/core/hle/kernel/svc.cpp
+++ b/src/core/hle/kernel/svc.cpp
@@ -671,7 +671,8 @@ static ResultCode GetInfo(u64* result, u64 info_id, u64 handle, u64 info_sub_id)
         break;
     }
     default:
-        UNIMPLEMENTED();
+        LOG_WARNING(Kernel_SVC, "(STUBBED) Unimplemented svcGetInfo id=0x{:016X}", info_id);
+        return ERR_INVALID_ENUM_VALUE;
     }
 
     return RESULT_SUCCESS;
diff --git a/src/core/hle/service/nvdrv/interface.cpp b/src/core/hle/service/nvdrv/interface.cpp
index ac3859353..602086eed 100644
--- a/src/core/hle/service/nvdrv/interface.cpp
+++ b/src/core/hle/service/nvdrv/interface.cpp
@@ -88,6 +88,20 @@ void NVDRV::FinishInitialize(Kernel::HLERequestContext& ctx) {
     rb.Push(RESULT_SUCCESS);
 }
 
+void NVDRV::GetStatus(Kernel::HLERequestContext& ctx) {
+    LOG_WARNING(Service_NVDRV, "(STUBBED) called");
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+}
+
+void NVDRV::DumpGraphicsMemoryInfo(Kernel::HLERequestContext& ctx) {
+    // According to SwitchBrew, this has no inputs and no outputs, so effectively does nothing on
+    // retail hardware.
+    LOG_DEBUG(Service_NVDRV, "called");
+    IPC::ResponseBuilder rb{ctx, 2};
+    rb.Push(RESULT_SUCCESS);
+}
+
 NVDRV::NVDRV(std::shared_ptr<Module> nvdrv, const char* name)
     : ServiceFramework(name), nvdrv(std::move(nvdrv)) {
     static const FunctionInfo functions[] = {
@@ -97,10 +111,10 @@ NVDRV::NVDRV(std::shared_ptr<Module> nvdrv, const char* name)
         {3, &NVDRV::Initialize, "Initialize"},
         {4, &NVDRV::QueryEvent, "QueryEvent"},
         {5, nullptr, "MapSharedMem"},
-        {6, nullptr, "GetStatus"},
+        {6, &NVDRV::GetStatus, "GetStatus"},
         {7, nullptr, "ForceSetClientPID"},
         {8, &NVDRV::SetClientPID, "SetClientPID"},
-        {9, nullptr, "DumpGraphicsMemoryInfo"},
+        {9, &NVDRV::DumpGraphicsMemoryInfo, "DumpGraphicsMemoryInfo"},
         {10, nullptr, "InitializeDevtools"},
         {11, &NVDRV::Ioctl, "Ioctl2"},
         {12, nullptr, "Ioctl3"},
diff --git a/src/core/hle/service/nvdrv/interface.h b/src/core/hle/service/nvdrv/interface.h
index d340893c2..5a1e4baa7 100644
--- a/src/core/hle/service/nvdrv/interface.h
+++ b/src/core/hle/service/nvdrv/interface.h
@@ -24,6 +24,8 @@ private:
     void QueryEvent(Kernel::HLERequestContext& ctx);
     void SetClientPID(Kernel::HLERequestContext& ctx);
     void FinishInitialize(Kernel::HLERequestContext& ctx);
+    void GetStatus(Kernel::HLERequestContext& ctx);
+    void DumpGraphicsMemoryInfo(Kernel::HLERequestContext& ctx);
 
     std::shared_ptr<Module> nvdrv;
 
diff --git a/src/video_core/memory_manager.cpp b/src/video_core/memory_manager.cpp
index 77a20bb84..47247f097 100644
--- a/src/video_core/memory_manager.cpp
+++ b/src/video_core/memory_manager.cpp
@@ -9,6 +9,13 @@
 
 namespace Tegra {
 
+MemoryManager::MemoryManager() {
+    // Mark the first page as reserved, so that 0 is not a valid GPUVAddr. Otherwise, games might
+    // try to use 0 as a valid address, which is also used to mean nullptr. This fixes a bug with
+    // Undertale using 0 for a render target.
+    PageSlot(0) = static_cast<u64>(PageStatus::Reserved);
+}
+
 GPUVAddr MemoryManager::AllocateSpace(u64 size, u64 align) {
     const std::optional<GPUVAddr> gpu_addr{FindFreeBlock(0, size, align, PageStatus::Unmapped)};
 
diff --git a/src/video_core/memory_manager.h b/src/video_core/memory_manager.h
index 4eb338aa2..fb03497ca 100644
--- a/src/video_core/memory_manager.h
+++ b/src/video_core/memory_manager.h
@@ -18,7 +18,7 @@ using GPUVAddr = u64;
 
 class MemoryManager final {
 public:
-    MemoryManager() = default;
+    MemoryManager();
 
     GPUVAddr AllocateSpace(u64 size, u64 align);
     GPUVAddr AllocateSpace(GPUVAddr gpu_addr, u64 size, u64 align);
@@ -37,6 +37,7 @@ private:
     enum class PageStatus : u64 {
         Unmapped = 0xFFFFFFFFFFFFFFFFULL,
         Allocated = 0xFFFFFFFFFFFFFFFEULL,
+        Reserved = 0xFFFFFFFFFFFFFFFDULL,
     };
 
     std::optional<GPUVAddr> FindFreeBlock(GPUVAddr region_start, u64 size, u64 align,