2 files changed, 210 insertions, 0 deletions
diff --git a/src/core/hle/service/os/process.cpp b/src/core/hle/service/os/process.cpp
new file mode 100644
index 000000000..0dbadc315
--- /dev/null
+++ b/src/core/hle/service/os/process.cpp
@@ -0,0 +1,152 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "common/scope_exit.h"
+
+#include "core/hle/kernel/k_process.h"
+#include "core/hle/kernel/svc_types.h"
+#include "core/hle/service/os/process.h"
+#include "core/loader/loader.h"
+
+namespace Service {
+
+Process::Process(Core::System& system)
+    : m_system(system), m_process(), m_main_thread_priority(), m_main_thread_stack_size(),
+      m_process_started() {}
+
+Process::~Process() {
+    this->Finalize();
+}
+
+bool Process::Initialize(Loader::AppLoader& loader, Loader::ResultStatus& out_load_result) {
+    // First, ensure we are not holding another process.
+    this->Finalize();
+
+    // Create the process.
+    auto* const process = Kernel::KProcess::Create(m_system.Kernel());
+    Kernel::KProcess::Register(m_system.Kernel(), process);
+
+    // On exit, ensure we free the additional reference to the process.
+    SCOPE_EXIT {
+        process->Close();
+    };
+
+    // Insert process modules into memory.
+    const auto [load_result, load_parameters] = loader.Load(*process, m_system);
+    out_load_result = load_result;
+
+    // Ensure loading was successful.
+    if (load_result != Loader::ResultStatus::Success) {
+        return false;
+    }
+
+    // TODO: remove this, kernel already tracks this
+    m_system.Kernel().AppendNewProcess(process);
+
+    // Note the load parameters from NPDM.
+    m_main_thread_priority = load_parameters->main_thread_priority;
+    m_main_thread_stack_size = load_parameters->main_thread_stack_size;
+
+    // This process has not started yet.
+    m_process_started = false;
+
+    // Take ownership of the process object.
+    m_process = process;
+    m_process->Open();
+
+    // We succeeded.
+    return true;
+}
+
+void Process::Finalize() {
+    // Terminate, if we are currently holding a process.
+    this->Terminate();
+
+    // Close the process.
+    if (m_process) {
+        m_process->Close();
+
+        // TODO: remove this, kernel already tracks this
+        m_system.Kernel().RemoveProcess(m_process);
+    }
+
+    // Clean up.
+    m_process = nullptr;
+    m_main_thread_priority = 0;
+    m_main_thread_stack_size = 0;
+    m_process_started = false;
+}
+
+bool Process::Run() {
+    // If we already started the process, don't start again.
+    if (m_process_started) {
+        return false;
+    }
+
+    // Start.
+    if (m_process) {
+        m_process->Run(m_main_thread_priority, m_main_thread_stack_size);
+    }
+
+    // Mark as started.
+    m_process_started = true;
+
+    // We succeeded.
+    return true;
+}
+
+void Process::Terminate() {
+    if (m_process) {
+        m_process->Terminate();
+    }
+}
+
+void Process::ResetSignal() {
+    if (m_process) {
+        m_process->Reset();
+    }
+}
+
+bool Process::IsRunning() const {
+    if (m_process) {
+        const auto state = m_process->GetState();
+        return state == Kernel::KProcess::State::Running ||
+               state == Kernel::KProcess::State::RunningAttached ||
+               state == Kernel::KProcess::State::DebugBreak;
+    }
+
+    return false;
+}
+
+bool Process::IsTerminated() const {
+    if (m_process) {
+        return m_process->IsTerminated();
+    }
+
+    return false;
+}
+
+u64 Process::GetProcessId() const {
+    if (m_process) {
+        return m_process->GetProcessId();
+    }
+
+    return 0;
+}
+
+u64 Process::GetProgramId() const {
+    if (m_process) {
+        return m_process->GetProgramId();
+    }
+
+    return 0;
+}
+
+void Process::Suspend(bool suspended) {
+    if (m_process) {
+        m_process->SetActivity(suspended ? Kernel::Svc::ProcessActivity::Paused
+                                         : Kernel::Svc::ProcessActivity::Runnable);
+    }
+}
+
+} // namespace Service
diff --git a/src/core/hle/service/os/process.h b/src/core/hle/service/os/process.h
new file mode 100644
index 000000000..9109b7d0a
--- /dev/null
+++ b/src/core/hle/service/os/process.h
@@ -0,0 +1,58 @@
+// SPDX-FileCopyrightText: Copyright 2024 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#pragma once
+
+#include "common/common_types.h"
+
+namespace Core {
+class System;
+}
+
+namespace Loader {
+class AppLoader;
+enum class ResultStatus : u16;
+} // namespace Loader
+
+namespace Kernel {
+class KProcess;
+}
+
+namespace Service {
+
+class Process {
+public:
+    explicit Process(Core::System& system);
+    ~Process();
+
+    bool Initialize(Loader::AppLoader& loader, Loader::ResultStatus& out_load_result);
+    void Finalize();
+
+    bool Run();
+    void Terminate();
+    void Suspend(bool suspended);
+    void ResetSignal();
+
+    bool IsInitialized() const {
+        return m_process != nullptr;
+    }
+
+    bool IsRunning() const;
+    bool IsTerminated() const;
+
+    u64 GetProcessId() const;
+    u64 GetProgramId() const;
+
+    Kernel::KProcess* GetHandle() const {
+        return m_process;
+    }
+
+private:
+    Core::System& m_system;
+    Kernel::KProcess* m_process{};
+    s32 m_main_thread_priority{};
+    u64 m_main_thread_stack_size{};
+    bool m_process_started{};
+};
+
+} // namespace Service