1 files changed, 106 insertions, 0 deletions
diff --git a/src/core/hle/kernel/svc/svc_shared_memory.cpp b/src/core/hle/kernel/svc/svc_shared_memory.cpp
new file mode 100644
index 000000000..d465bcbe7
--- /dev/null
+++ b/src/core/hle/kernel/svc/svc_shared_memory.cpp
@@ -0,0 +1,106 @@
+// 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_shared_memory.h"
+#include "core/hle/kernel/svc.h"
+
+namespace Kernel::Svc {
+namespace {
+
+constexpr bool IsValidSharedMemoryPermission(MemoryPermission perm) {
+    switch (perm) {
+    case MemoryPermission::Read:
+    case MemoryPermission::ReadWrite:
+        return true;
+    default:
+        return false;
+    }
+}
+
+[[maybe_unused]] constexpr bool IsValidRemoteSharedMemoryPermission(MemoryPermission perm) {
+    return IsValidSharedMemoryPermission(perm) || perm == MemoryPermission::DontCare;
+}
+
+} // namespace
+
+Result MapSharedMemory(Core::System& system, Handle shmem_handle, VAddr address, u64 size,
+                       Svc::MemoryPermission map_perm) {
+    LOG_TRACE(Kernel_SVC,
+              "called, shared_memory_handle=0x{:X}, addr=0x{:X}, size=0x{:X}, permissions=0x{:08X}",
+              shmem_handle, address, size, map_perm);
+
+    // Validate the address/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 permission.
+    R_UNLESS(IsValidSharedMemoryPermission(map_perm), ResultInvalidNewMemoryPermission);
+
+    // Get the current process.
+    auto& process = *system.Kernel().CurrentProcess();
+    auto& page_table = process.PageTable();
+
+    // Get the shared memory.
+    KScopedAutoObject shmem = process.GetHandleTable().GetObject<KSharedMemory>(shmem_handle);
+    R_UNLESS(shmem.IsNotNull(), ResultInvalidHandle);
+
+    // Verify that the mapping is in range.
+    R_UNLESS(page_table.CanContain(address, size, KMemoryState::Shared), ResultInvalidMemoryRegion);
+
+    // Add the shared memory to the process.
+    R_TRY(process.AddSharedMemory(shmem.GetPointerUnsafe(), address, size));
+
+    // Ensure that we clean up the shared memory if we fail to map it.
+    auto guard =
+        SCOPE_GUARD({ process.RemoveSharedMemory(shmem.GetPointerUnsafe(), address, size); });
+
+    // Map the shared memory.
+    R_TRY(shmem->Map(process, address, size, map_perm));
+
+    // We succeeded.
+    guard.Cancel();
+    return ResultSuccess;
+}
+
+Result MapSharedMemory32(Core::System& system, Handle shmem_handle, u32 address, u32 size,
+                         Svc::MemoryPermission map_perm) {
+    return MapSharedMemory(system, shmem_handle, address, size, map_perm);
+}
+
+Result UnmapSharedMemory(Core::System& system, Handle shmem_handle, VAddr address, u64 size) {
+    // Validate the address/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);
+
+    // Get the current process.
+    auto& process = *system.Kernel().CurrentProcess();
+    auto& page_table = process.PageTable();
+
+    // Get the shared memory.
+    KScopedAutoObject shmem = process.GetHandleTable().GetObject<KSharedMemory>(shmem_handle);
+    R_UNLESS(shmem.IsNotNull(), ResultInvalidHandle);
+
+    // Verify that the mapping is in range.
+    R_UNLESS(page_table.CanContain(address, size, KMemoryState::Shared), ResultInvalidMemoryRegion);
+
+    // Unmap the shared memory.
+    R_TRY(shmem->Unmap(process, address, size));
+
+    // Remove the shared memory from the process.
+    process.RemoveSharedMemory(shmem.GetPointerUnsafe(), address, size);
+
+    return ResultSuccess;
+}
+
+Result UnmapSharedMemory32(Core::System& system, Handle shmem_handle, u32 address, u32 size) {
+    return UnmapSharedMemory(system, shmem_handle, address, size);
+}
+
+} // namespace Kernel::Svc