5fcbfc06eb
* Simplifies scheduling logic, specifically regarding thread status. It should be much clearer which statuses are valid for a thread at any given point in the system. * Removes dead code from thread.cpp. * Moves the implementation of resetting a ThreadContext to the corresponding core's implementation. Other changes: * Fixed comments in arm interfaces. * Updated comments in thread.cpp * Removed confusing, useless, functions like MakeReady() and ChangeStatus() from thread.cpp. * Removed stack_size from Thread. In the CTR kernel, the thread's stack would be allocated before thread creation.
131 lines
3.3 KiB
C++
131 lines
3.3 KiB
C++
// Copyright 2014 Citra Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#pragma once
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#include "common/common.h"
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#include "common/common_types.h"
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namespace Core {
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struct ThreadContext;
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}
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/// Generic ARM11 CPU interface
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class ARM_Interface : NonCopyable {
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public:
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ARM_Interface() {
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num_instructions = 0;
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}
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virtual ~ARM_Interface() {
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}
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/**
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* Runs the CPU for the given number of instructions
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* @param num_instructions Number of instructions to run
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*/
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void Run(int num_instructions) {
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ExecuteInstructions(num_instructions);
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this->num_instructions += num_instructions;
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}
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/// Step CPU by one instruction
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void Step() {
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Run(1);
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}
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/**
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* Set the Program Counter to an address
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* @param addr Address to set PC to
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*/
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virtual void SetPC(u32 addr) = 0;
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/*
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* Get the current Program Counter
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* @return Returns current PC
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*/
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virtual u32 GetPC() const = 0;
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/**
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* Get an ARM register
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* @param index Register index (0-15)
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* @return Returns the value in the register
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*/
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virtual u32 GetReg(int index) const = 0;
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/**
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* Set an ARM register
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* @param index Register index (0-15)
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* @param value Value to set register to
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*/
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virtual void SetReg(int index, u32 value) = 0;
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/**
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* Get the current CPSR register
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* @return Returns the value of the CPSR register
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*/
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virtual u32 GetCPSR() const = 0;
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/**
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* Set the current CPSR register
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* @param cpsr Value to set CPSR to
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*/
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virtual void SetCPSR(u32 cpsr) = 0;
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/**
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* Returns the number of clock ticks since the last rese
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* @return Returns number of clock ticks
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*/
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virtual u64 GetTicks() const = 0;
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/**
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* Advance the CPU core by the specified number of ticks (e.g. to simulate CPU execution time)
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* @param ticks Number of ticks to advance the CPU core
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*/
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virtual void AddTicks(u64 ticks) = 0;
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/**
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* Initializes a CPU context for use on this CPU
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* @param context Thread context to reset
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* @param stack_top Pointer to the top of the stack
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* @param entry_point Entry point for execution
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* @param arg User argument for thread
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*/
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virtual void ResetContext(Core::ThreadContext& context, u32 stack_top, u32 entry_point, u32 arg) = 0;
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/**
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* Saves the current CPU context
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* @param ctx Thread context to save
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*/
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virtual void SaveContext(Core::ThreadContext& ctx) = 0;
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/**
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* Loads a CPU context
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* @param ctx Thread context to load
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*/
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virtual void LoadContext(const Core::ThreadContext& ctx) = 0;
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/// Prepare core for thread reschedule (if needed to correctly handle state)
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virtual void PrepareReschedule() = 0;
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/// Getter for num_instructions
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u64 GetNumInstructions() {
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return num_instructions;
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}
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s64 down_count; ///< A decreasing counter of remaining cycles before the next event, decreased by the cpu run loop
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protected:
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/**
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* Executes the given number of instructions
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* @param num_instructions Number of instructions to executes
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*/
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virtual void ExecuteInstructions(int num_instructions) = 0;
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private:
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u64 num_instructions; ///< Number of instructions executed
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};
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