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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include "common/common.h"
#include "common/common_types.h"
#include "core/arm/skyeye_common/arm_regformat.h"
namespace Core {
struct ThreadContext;
}
/// Generic ARM11 CPU interface
class ARM_Interface : NonCopyable {
public:
ARM_Interface() {
num_instructions = 0;
}
virtual ~ARM_Interface() {
}
/**
* Runs the CPU for the given number of instructions
* @param num_instructions Number of instructions to run
*/
void Run(int num_instructions) {
ExecuteInstructions(num_instructions);
this->num_instructions += num_instructions;
}
/// Step CPU by one instruction
void Step() {
Run(1);
}
/**
* Set the Program Counter to an address
* @param addr Address to set PC to
*/
virtual void SetPC(u32 addr) = 0;
/*
* Get the current Program Counter
* @return Returns current PC
*/
virtual u32 GetPC() const = 0;
/**
* Get an ARM register
* @param index Register index (0-15)
* @return Returns the value in the register
*/
virtual u32 GetReg(int index) const = 0;
/**
* Set an ARM register
* @param index Register index (0-15)
* @param value Value to set register to
*/
virtual void SetReg(int index, u32 value) = 0;
/**
* Get the current CPSR register
* @return Returns the value of the CPSR register
*/
virtual u32 GetCPSR() const = 0;
/**
* Set the current CPSR register
* @param cpsr Value to set CPSR to
*/
virtual void SetCPSR(u32 cpsr) = 0;
/**
* Gets the value stored in a CP15 register.
* @param reg The CP15 register to retrieve the value from.
* @return the value stored in the given CP15 register.
*/
virtual u32 GetCP15Register(CP15Register reg) = 0;
/**
* Stores the given value into the indicated CP15 register.
* @param reg The CP15 register to store the value into.
* @param value The value to store into the CP15 register.
*/
virtual void SetCP15Register(CP15Register reg, u32 value) = 0;
/**
* Advance the CPU core by the specified number of ticks (e.g. to simulate CPU execution time)
* @param ticks Number of ticks to advance the CPU core
*/
virtual void AddTicks(u64 ticks) = 0;
/**
* Initializes a CPU context for use on this CPU
* @param context Thread context to reset
* @param stack_top Pointer to the top of the stack
* @param entry_point Entry point for execution
* @param arg User argument for thread
*/
virtual void ResetContext(Core::ThreadContext& context, u32 stack_top, u32 entry_point, u32 arg) = 0;
/**
* Saves the current CPU context
* @param ctx Thread context to save
*/
virtual void SaveContext(Core::ThreadContext& ctx) = 0;
/**
* Loads a CPU context
* @param ctx Thread context to load
*/
virtual void LoadContext(const Core::ThreadContext& ctx) = 0;
/// Prepare core for thread reschedule (if needed to correctly handle state)
virtual void PrepareReschedule() = 0;
/// Getter for num_instructions
u64 GetNumInstructions() {
return num_instructions;
}
s64 down_count; ///< A decreasing counter of remaining cycles before the next event, decreased by the cpu run loop
protected:
/**
* Executes the given number of instructions
* @param num_instructions Number of instructions to executes
*/
virtual void ExecuteInstructions(int num_instructions) = 0;
private:
u64 num_instructions; ///< Number of instructions executed
};
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