1 files changed, 79 insertions, 0 deletions
diff --git a/src/core/hle/kernel/svc/svc_transfer_memory.cpp b/src/core/hle/kernel/svc/svc_transfer_memory.cpp
new file mode 100644
index 000000000..b14ae24a1
--- /dev/null
+++ b/src/core/hle/kernel/svc/svc_transfer_memory.cpp
@@ -0,0 +1,79 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/scope_exit.h"
+#include "core/core.h"
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/k_scoped_resource_reservation.h"
+#include "core/hle/kernel/k_transfer_memory.h"
+#include "core/hle/kernel/svc.h"
+
+namespace Kernel::Svc {
+namespace {
+
+constexpr bool IsValidTransferMemoryPermission(MemoryPermission perm) {
+    switch (perm) {
+    case MemoryPermission::None:
+    case MemoryPermission::Read:
+    case MemoryPermission::ReadWrite:
+        return true;
+    default:
+        return false;
+    }
+}
+
+} // Anonymous namespace
+
+/// Creates a TransferMemory object
+Result CreateTransferMemory(Core::System& system, Handle* out, VAddr address, u64 size,
+                            MemoryPermission map_perm) {
+    auto& kernel = system.Kernel();
+
+    // Validate the size.
+    R_UNLESS(Common::IsAligned(address, PageSize), ResultInvalidAddress);
+    R_UNLESS(Common::IsAligned(size, PageSize), ResultInvalidSize);
+    R_UNLESS(size > 0, ResultInvalidSize);
+    R_UNLESS((address < address + size), ResultInvalidCurrentMemory);
+
+    // Validate the permissions.
+    R_UNLESS(IsValidTransferMemoryPermission(map_perm), ResultInvalidNewMemoryPermission);
+
+    // Get the current process and handle table.
+    auto& process = *kernel.CurrentProcess();
+    auto& handle_table = process.GetHandleTable();
+
+    // Reserve a new transfer memory from the process resource limit.
+    KScopedResourceReservation trmem_reservation(kernel.CurrentProcess(),
+                                                 LimitableResource::TransferMemoryCountMax);
+    R_UNLESS(trmem_reservation.Succeeded(), ResultLimitReached);
+
+    // Create the transfer memory.
+    KTransferMemory* trmem = KTransferMemory::Create(kernel);
+    R_UNLESS(trmem != nullptr, ResultOutOfResource);
+
+    // Ensure the only reference is in the handle table when we're done.
+    SCOPE_EXIT({ trmem->Close(); });
+
+    // Ensure that the region is in range.
+    R_UNLESS(process.PageTable().Contains(address, size), ResultInvalidCurrentMemory);
+
+    // Initialize the transfer memory.
+    R_TRY(trmem->Initialize(address, size, map_perm));
+
+    // Commit the reservation.
+    trmem_reservation.Commit();
+
+    // Register the transfer memory.
+    KTransferMemory::Register(kernel, trmem);
+
+    // Add the transfer memory to the handle table.
+    R_TRY(handle_table.Add(out, trmem));
+
+    return ResultSuccess;
+}
+
+Result CreateTransferMemory32(Core::System& system, Handle* out, u32 address, u32 size,
+                              MemoryPermission map_perm) {
+    return CreateTransferMemory(system, out, address, size, map_perm);
+}
+} // namespace Kernel::Svc