early-access version 1255

src/core/hle/kernel/resource_limit.h

@@ -0,0 +1,104 @@
+// Copyright 2015 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <array>
+#include <memory>
+
+#include "common/common_types.h"
+#include "core/hle/kernel/object.h"
+
+union ResultCode;
+
+namespace Kernel {
+
+class KernelCore;
+
+enum class ResourceType : u32 {
+    PhysicalMemory,
+    Threads,
+    Events,
+    TransferMemory,
+    Sessions,
+
+    // Used as a count, not an actual type.
+    ResourceTypeCount
+};
+
+constexpr bool IsValidResourceType(ResourceType type) {
+    return type < ResourceType::ResourceTypeCount;
+}
+
+class ResourceLimit final : public Object {
+public:
+    explicit ResourceLimit(KernelCore& kernel);
+    ~ResourceLimit() override;
+
+    /// Creates a resource limit object.
+    static std::shared_ptr<ResourceLimit> Create(KernelCore& kernel);
+
+    std::string GetTypeName() const override {
+        return "ResourceLimit";
+    }
+    std::string GetName() const override {
+        return GetTypeName();
+    }
+
+    static constexpr HandleType HANDLE_TYPE = HandleType::ResourceLimit;
+    HandleType GetHandleType() const override {
+        return HANDLE_TYPE;
+    }
+
+    bool Reserve(ResourceType resource, s64 amount);
+    bool Reserve(ResourceType resource, s64 amount, u64 timeout);
+    void Release(ResourceType resource, u64 amount);
+    void Release(ResourceType resource, u64 used_amount, u64 available_amount);
+
+    /**
+     * Gets the current value for the specified resource.
+     * @param resource Requested resource type
+     * @returns The current value of the resource type
+     */
+    s64 GetCurrentResourceValue(ResourceType resource) const;
+
+    /**
+     * Gets the max value for the specified resource.
+     * @param resource Requested resource type
+     * @returns The max value of the resource type
+     */
+    s64 GetMaxResourceValue(ResourceType resource) const;
+
+    /**
+     * Sets the limit value for a given resource type.
+     *
+     * @param resource The resource type to apply the limit to.
+     * @param value    The limit to apply to the given resource type.
+     *
+     * @return A result code indicating if setting the limit value
+     *         was successful or not.
+     *
+     * @note The supplied limit value *must* be greater than or equal to
+     *       the current resource value for the given resource type,
+     *       otherwise ERR_INVALID_STATE will be returned.
+     */
+    ResultCode SetLimitValue(ResourceType resource, s64 value);
+
+private:
+    // TODO(Subv): Increment resource limit current values in their respective Kernel::T::Create
+    // functions
+    //
+    // Currently we have no way of distinguishing if a Create was called by the running application,
+    // or by a service module. Approach this once we have separated the service modules into their
+    // own processes
+
+    using ResourceArray =
+        std::array<s64, static_cast<std::size_t>(ResourceType::ResourceTypeCount)>;
+
+    ResourceArray limit{};
+    ResourceArray current{};
+    ResourceArray available{};
+};
+
+} // namespace Kernel