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+/* -------------------------------------------
+
+ Copyright ZKA Web Services Co.
+
+------------------------------------------- */
+
+#ifndef __INC_MP_MANAGER_H__
+#define __INC_MP_MANAGER_H__
+
+#include <ArchKit/ArchKit.h>
+#include <CompilerKit/CompilerKit.h>
+#include <NewKit/Ref.h>
+
+/// @note Last Rev Sun 28 Jul CET 2024
+/// @note Last Rev Thu, Aug 1, 2024 9:07:38 AM
+
+#define cMaxHartInsideSched (8U)
+
+namespace Kernel
+{
+ class HardwareThread;
+ class HardwareThreadScheduler;
+
+ using ThreadID = UInt32;
+
+ enum ThreadKind
+ {
+ kHartSystemReserved, // System reserved thread, well user can't use it
+ kHartStandard, // user thread, cannot be used by Kernel
+ kHartFallback, // fallback thread, cannot be used by user if not clear or
+ // used by Kernel.
+ kHartBoot, // The core we booted from, the mama.
+ kInvalidHart,
+ kHartCount,
+ };
+
+ typedef enum ThreadKind ThreadKind;
+ typedef ThreadID ThreadID;
+
+ /***********************************************************************************/
+ ///
+ /// \name HardwareThread
+ /// \brief Abstraction over the CPU's core, used to run processes or threads.
+ ///
+ /***********************************************************************************/
+
+ class HardwareThread final
+ {
+ public:
+ explicit HardwareThread();
+ ~HardwareThread();
+
+ public:
+ ZKA_COPY_DEFAULT(HardwareThread)
+
+ public:
+ operator bool();
+
+ public:
+ void Wake(const bool wakeup = false) noexcept;
+ void Busy(const bool busy = false) noexcept;
+
+ public:
+ bool Switch(VoidPtr image, UInt8* stack_ptr, HAL::StackFramePtr frame);
+ bool IsWakeup() noexcept;
+
+ public:
+ HAL::StackFramePtr StackFrame() noexcept;
+ const ThreadKind& Kind() noexcept;
+ bool IsBusy() noexcept;
+ const ThreadID& ID() noexcept;
+
+ private:
+ HAL::StackFramePtr fStack{nullptr};
+ ThreadKind fKind{ThreadKind::kHartStandard};
+ ThreadID fID{0};
+ ProcessID fSourcePID{-1};
+ Bool fWakeup{false};
+ Bool fBusy{false};
+ UInt64 fPTime{0};
+
+ private:
+ friend class HardwareThreadScheduler;
+ friend class UserProcessHelper;
+ };
+
+ ///
+ /// \name HardwareThreadScheduler
+ /// \brief Class to manage the thread scheduling.
+ ///
+
+ class HardwareThreadScheduler final : public ISchedulerObject
+ {
+ private:
+ friend class UserProcessHelper;
+
+ public:
+ explicit HardwareThreadScheduler();
+ ~HardwareThreadScheduler();
+ ZKA_COPY_DEFAULT(HardwareThreadScheduler);
+
+ public:
+ HAL::StackFramePtr Leak() noexcept;
+
+ public:
+ Ref<HardwareThread*> operator[](const SizeT& idx);
+ bool operator!() noexcept;
+ operator bool() noexcept;
+
+ const Bool IsUser() override
+ {
+ return Yes;
+ }
+
+ const Bool IsKernel() override
+ {
+ return No;
+ }
+
+ const Bool HasMP() override
+ {
+ return kHandoverHeader->f_HardwareTables.f_MultiProcessingEnabled;
+ }
+
+ public:
+ /// @brief Shared instance of the MP Mgr.
+ /// @return the reference to the mp manager class.
+ STATIC HardwareThreadScheduler& The();
+
+ public:
+ /// @brief Returns the amount of threads present in the system.
+ /// @returns SizeT the amount of cores present.
+ SizeT Count() noexcept;
+
+ private:
+ Array<HardwareThread, cMaxHartInsideSched> fThreadList;
+ ThreadID fCurrentThread{0};
+ };
+
+ /// @brief wakes up thread.
+ /// wakes up thread from hang.
+ Void mp_wakeup_thread(HAL::StackFramePtr stack);
+
+ /// @brief makes thread sleep.
+ /// hooks and hangs thread to prevent code from executing.
+ Void mp_hang_thread(HAL::StackFramePtr stack);
+} // namespace Kernel
+
+#endif // !__INC_MP_MANAGER_H__