bus.hpp

#ifndef BUS_HPP
#define BUS_HPP
 
#include <stdint.h>
#include <string>
 
#define BIOS_RANGE 0x1fc00000, 0x1fc7ffff
#define MEM_CTRL_RANGE 0x1f801000, 0x1f801023
#define RAM_SIZE_RANGE 0x1f801060, 0x1f801063
#define CACHE_CTRL_RANGE 0xfffe0130, 0xfffe0133
#define RAM_RANGE 0x00000000, 0x001fffff
#define SPU_RANGE 0x1f801c00, 0x1f801ffc
#define EXPANSION2_RANGE 0x1f802000, 0x1f803fff
#define EXPANSION1_RANGE 0x1f000000, 0x1f7fffff
#define INTERRUPT_RANGE 0x1f801070, 0x1f801077
#define TIMER_RANGE 0x1f801100, 0x1f801131
 
class CPU;
class BIOS;
class RAM;
 
struct Range
{
    uint32_t start;
 
    uint32_t end;
 
    Range(uint32_t start, uint32_t end) : start(start), end(end) {}
 
    bool contains(uint32_t addr)
    {
        return addr >= start && addr <= end;
    }
 
    uint32_t offset(uint32_t addr)
    {
        return addr - start;
    }
};
 
class Bus
{
public:
    Bus(std::string bios_path);
 
    uint32_t read32_cpu(uint32_t addr);
    void write32_cpu(uint32_t addr, uint32_t data);
 
    uint16_t read16_cpu(uint32_t addr);
    void write16_cpu(uint32_t addr, uint16_t data);
 
    uint8_t read8_cpu(uint32_t addr);
    void write8_cpu(uint32_t addr, uint8_t data);
 
    void clock();
 
private:
    uint32_t region_mask(uint32_t addr);
 
private:
    CPU* cpu;
 
    BIOS* bios;
 
    RAM *ram;
 
    Range bios_range = Range(BIOS_RANGE);
 
    Range mem_ctrl_range = Range(MEM_CTRL_RANGE);
 
    Range ram_size_range = Range(RAM_SIZE_RANGE);
 
    Range cache_ctrl_range = Range(CACHE_CTRL_RANGE);
 
    Range ram_range = Range(RAM_RANGE);
 
    Range spu_range = Range(SPU_RANGE);
 
    Range expansion2_range = Range(EXPANSION2_RANGE);
 
    Range expansion1_range = Range(EXPANSION1_RANGE);
 
    Range interrupt_range = Range(INTERRUPT_RANGE);
 
    Range timer_range = Range(TIMER_RANGE);
};
 
#endif