1 files changed, 54 insertions, 0 deletions
diff --git a/src/core/hle/service/jit/jit_code_memory.cpp b/src/core/hle/service/jit/jit_code_memory.cpp
new file mode 100644
index 000000000..2b480488a
--- /dev/null
+++ b/src/core/hle/service/jit/jit_code_memory.cpp
@@ -0,0 +1,54 @@
+// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "core/hle/service/jit/jit_code_memory.h"
+
+namespace Service::JIT {
+
+Result CodeMemory::Initialize(Kernel::KProcess& process, Kernel::KCodeMemory& code_memory,
+                              size_t size, Kernel::Svc::MemoryPermission perm,
+                              std::mt19937_64& generate_random) {
+    auto& page_table = process.GetPageTable();
+    const u64 alias_code_start =
+        GetInteger(page_table.GetAliasCodeRegionStart()) / Kernel::PageSize;
+    const u64 alias_code_size = page_table.GetAliasCodeRegionSize() / Kernel::PageSize;
+
+    // NOTE: This will retry indefinitely until mapping the code memory succeeds.
+    while (true) {
+        // Generate a new trial address.
+        const u64 mapped_address =
+            (alias_code_start + (generate_random() % alias_code_size)) * Kernel::PageSize;
+
+        // Try to map the address
+        R_TRY_CATCH(code_memory.MapToOwner(mapped_address, size, perm)) {
+            R_CATCH(Kernel::ResultInvalidMemoryRegion) {
+                // If we could not map here, retry.
+                continue;
+            }
+        }
+        R_END_TRY_CATCH;
+
+        // Set members.
+        m_code_memory = std::addressof(code_memory);
+        m_size = size;
+        m_address = mapped_address;
+        m_perm = perm;
+
+        // Open a new reference to the code memory.
+        m_code_memory->Open();
+
+        // We succeeded.
+        R_SUCCEED();
+    }
+}
+
+void CodeMemory::Finalize() {
+    if (m_code_memory) {
+        R_ASSERT(m_code_memory->UnmapFromOwner(m_address, m_size));
+        m_code_memory->Close();
+    }
+
+    m_code_memory = nullptr;
+}
+
+} // namespace Service::JIT