From 3be1a565f895d5399a6c1f6d0997dc528537fe86 Mon Sep 17 00:00:00 2001
From: Chloe Marcec <dmarcecguzman@gmail.com>
Date: Sat, 30 Jan 2021 20:40:49 +1100
Subject: kernel: Rewrite resource limit to be more accurate

Matches closer to hardware
---
 src/core/hle/kernel/k_resource_limit.h | 80 ++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 src/core/hle/kernel/k_resource_limit.h

(limited to 'src/core/hle/kernel/k_resource_limit.h')

diff --git a/src/core/hle/kernel/k_resource_limit.h b/src/core/hle/kernel/k_resource_limit.h
new file mode 100644
index 000000000..84c59177c
--- /dev/null
+++ b/src/core/hle/kernel/k_resource_limit.h
@@ -0,0 +1,80 @@
+// Copyright 2020 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+// This file references various implementation details from Atmosphere, an open-source firmware for
+// the Nintendo Switch. Copyright 2018-2020 Atmosphere-NX.
+
+#pragma once
+
+#include <array>
+#include "common/common_types.h"
+#include "core/hle/kernel/k_light_condition_variable.h"
+#include "core/hle/kernel/k_light_lock.h"
+#include "core/hle/kernel/object.h"
+
+union ResultCode;
+
+namespace Core {
+class System;
+}
+
+namespace Kernel {
+class KernelCore;
+enum class LimitableResource : u32 {
+    PhysicalMemoryMax = 0,
+    ThreadCountMax = 1,
+    EventCountMax = 2,
+    TransferMemoryCountMax = 3,
+    SessionCountMax = 4,
+
+    Count,
+};
+
+constexpr bool IsValidResourceType(LimitableResource type) {
+    return type < LimitableResource::Count;
+}
+
+class KResourceLimit final : public Object {
+public:
+    KResourceLimit(KernelCore& kernel, Core::System& system);
+    ~KResourceLimit();
+
+    s64 GetLimitValue(LimitableResource which) const;
+    s64 GetCurrentValue(LimitableResource which) const;
+    s64 GetPeakValue(LimitableResource which) const;
+    s64 GetFreeValue(LimitableResource which) const;
+
+    ResultCode SetLimitValue(LimitableResource which, s64 value);
+
+    bool Reserve(LimitableResource which, s64 value);
+    bool Reserve(LimitableResource which, s64 value, s64 timeout);
+    void Release(LimitableResource which, s64 value);
+    void Release(LimitableResource which, s64 value, s64 hint);
+
+    std::string GetTypeName() const override {
+        return "KResourceLimit";
+    }
+    std::string GetName() const override {
+        return GetTypeName();
+    }
+
+    static constexpr HandleType HANDLE_TYPE = HandleType::ResourceLimit;
+    HandleType GetHandleType() const override {
+        return HANDLE_TYPE;
+    }
+
+    virtual void Finalize() override {}
+
+private:
+    std::array<s64, static_cast<std::size_t>(LimitableResource::Count)> limit_values{};
+    std::array<s64, static_cast<std::size_t>(LimitableResource::Count)> current_values{};
+    std::array<s64, static_cast<std::size_t>(LimitableResource::Count)> current_hints{};
+    std::array<s64, static_cast<std::size_t>(LimitableResource::Count)> peak_values{};
+    mutable KLightLock m_lock;
+    s32 waiter_count{};
+    KLightConditionVariable cond_var;
+    KernelCore& kernel;
+    Core::System& system;
+};
+} // namespace Kernel
-- 
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