diff --git a/core/libs/prx/libkernel/DirectMemory/Export.cpp b/core/libs/prx/libkernel/DirectMemory/Export.cpp
index 7deed55ab..cf0fe1203 100644
--- a/core/libs/prx/libkernel/DirectMemory/Export.cpp
+++ b/core/libs/prx/libkernel/DirectMemory/Export.cpp
@@ -171,6 +171,10 @@ size_t APS5_VABI sceKernelGetDirectMemorySize(void) {
  return DIRECT_MEMORY_SIZE;
 }
 
+int APS5_VABI sceKernelEnableDmemAliasing(void) {
+ return 0;
+}
+
 int APS5_VABI sceKernelMapDirectMemory(void** addr, size_t len, int prot, int flags, int64_t direct_memory_start, size_t alignment) {
  (void)alignment;
  return DoMapDirect(addr, len, prot, flags, direct_memory_start, alignment);
diff --git a/core/libs/tests/GuestMemory.cpp b/core/libs/tests/GuestMemory.cpp
index d1fafa044..52b3867e1 100644
--- a/core/libs/tests/GuestMemory.cpp
+++ b/core/libs/tests/GuestMemory.cpp
@@ -59,6 +59,7 @@ int APS5_VABI sceKernelSetVirtualRangeName(const void*, std::uint64_t, const cha
 int APS5_VABI sceKernelClearVirtualRangeName(const void*, std::uint64_t);
 int APS5_VABI sceKernelAllocateDirectMemory(std::int64_t, std::int64_t, std::size_t, std::size_t, int, std::int64_t*);
 int APS5_VABI sceKernelMapDirectMemory(void**, std::size_t, int, int, std::int64_t, std::size_t);
+int APS5_VABI sceKernelEnableDmemAliasing();
 int APS5_VABI sceKernelReleaseDirectMemory(std::int64_t, std::size_t);
 int APS5_VABI sceKernelAvailableDirectMemorySize(std::int64_t, std::int64_t, std::size_t, std::int64_t*, std::size_t*);
 int APS5_VABI sceKernelCheckedReleaseDirectMemory(std::int64_t, std::size_t);
@@ -251,6 +252,7 @@ static void CheckDirectMemoryFollowsPhysicalPages() {
     Require(sceKernelMapDirectMemory(&first, page * 2, 3, 0, phys, 0) == 0);
     static_cast<unsigned char*>(first)[0] = 11;
     static_cast<unsigned char*>(first)[page + 5] = 22;
+    Require(sceKernelEnableDmemAliasing() == 0);
     void* alias = nullptr;
     Require(sceKernelMapDirectMemory(&alias, page, 3, 0, phys + page, 0) == 0);
     Require(alias != first && static_cast<unsigned char*>(alias)[5] == 22);
diff --git a/docs/dev/TechnicalDebt.md b/docs/dev/TechnicalDebt.md
index f5709b025..9ce251a0c 100644
--- a/docs/dev/TechnicalDebt.md
+++ b/docs/dev/TechnicalDebt.md
@@ -47,6 +47,7 @@ Throughout the project, every function at every stage either **does exactly what
 - [sceFontGlyphDefineAttribute](../../core/libs/prx/libSceFont/src/Render.cpp) (libSceFont) checks the glyph and ignores the attribute and its value, whose meaning is unknown. PPSA01325 sets attribute 0x11 to 0 on a glyph from `sceFontGenerateCharGlyph` that it deletes unused, and draws the character with `sceFontRenderCharGlyphImageHorizontal`
 - [sceAudioInInit](../../core/libs/prx/libSceAudioIn/Export.cpp) (libSceAudioIn) - returns 0 without library-wide setup, as `sceAudioOutInit` does; each `sceAudioInOpen` opens its own SDL capture device
 - [sceRazorCpuPushMarker](../../core/libs/prx/libSceRazorCpu/Export.cpp) (libSceRazorCpu) - signature (label, color, flags) from [SharpProspero](https://github.com/SvenGDK/SharpProspero), the same as sceRazorCpuPushMarkerStatic's except that the label is copied; it does nothing without a capture and returns 0
+- [sceKernelEnableDmemAliasing](../../core/libs/prx/libkernel/DirectMemory/Export.cpp) (libkernel) returns 0 and changes nothing: direct memory can always be mapped more than once here, as `DoMapDirect` in [DirectMemory.cpp](../../core/libs/prx/libkernel/DirectMemory/DirectMemory.cpp) only checks that the physical pages are allocated, so there is no aliasing to turn on. [shadPS4](https://github.com/shadps4-emu/shadPS4/blob/e0a466753a1aacbc8db8253be685bf7ab4d9daae/src/core/libraries/kernel/memory.cpp#L39-L43) (PS4) sets a flag there that lifts the `EBUSY` its [`sceKernelMapDirectMemory2`](https://github.com/shadps4-emu/shadPS4/blob/e0a466753a1aacbc8db8253be685bf7ab4d9daae/src/core/libraries/kernel/memory.cpp#L299-L301), and [`sceKernelMapDirectMemory` for SDK 2.50 and later](https://github.com/shadps4-emu/shadPS4/blob/e0a466753a1aacbc8db8253be685bf7ab4d9daae/src/core/libraries/kernel/memory.cpp#L237-L242), return for direct memory that is [already mapped](https://github.com/shadps4-emu/shadPS4/blob/e0a466753a1aacbc8db8253be685bf7ab4d9daae/src/core/memory.cpp#L548-L553); that check is not applied here. The no-argument `int` signature follows shadPS4 and ProsperoEden (PPSA99008), which calls it before mapping the same direct memory again. Whether the PS5 refuses such a mapping without the call is unverified
 
 ### Unknown function info