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Bus: Calculation of memory timings for external devices

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This commit is contained in:
Connor McLaughlin
2019-10-04 19:41:18 +10:00
parent 0b46a8cfc4
commit fd1c4f1457
2 changed files with 120 additions and 19 deletions
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50
src/core/bus.h
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@ -1,6 +1,7 @@
#pragma once
#include "YBaseLib/String.h"
#include "common/bitfield.h"
#include "types.h"
#include <array>
@ -95,6 +96,34 @@ private:
MEMCTRL_REG_COUNT = 9
};
union MEMDELAY
{
u32 bits;
BitField<u32, u8, 4, 4> access_time; // cycles
BitField<u32, bool, 8, 1> use_com0_time;
BitField<u32, bool, 9, 1> use_com1_time;
BitField<u32, bool, 10, 1> use_com2_time;
BitField<u32, bool, 11, 1> use_com3_time;
BitField<u32, bool, 12, 1> data_bus_16bit;
BitField<u32, u8, 16, 5> memory_window_size;
static constexpr u32 WRITE_MASK = 0b10101111'00011111'11111111'11111111;
};
union COMDELAY
{
u32 bits;
BitField<u32, u8, 0, 4> com0;
BitField<u32, u8, 4, 4> com1;
BitField<u32, u8, 8, 4> com2;
BitField<u32, u8, 12, 4> com3;
BitField<u32, u8, 16, 2> comunk;
static constexpr u32 WRITE_MASK = 0b00000000'00000011'11111111'11111111;
};
union MEMCTRL
{
u32 regs[MEMCTRL_REG_COUNT];
@ -103,18 +132,21 @@ private:
{
u32 exp1_base;
u32 exp2_base;
u32 exp1_delay_size;
u32 exp3_delay_size;
u32 bios_delay_size;
u32 spu_delay_size;
u32 cdrom_delay_size;
u32 exp2_delay_size;
u32 common_delay_size;
MEMDELAY exp1_delay_size;
MEMDELAY exp3_delay_size;
MEMDELAY bios_delay_size;
MEMDELAY spu_delay_size;
MEMDELAY cdrom_delay_size;
MEMDELAY exp2_delay_size;
COMDELAY common_delay;
};
};
bool LoadBIOS();
static std::tuple<TickCount, TickCount, TickCount> CalculateMemoryTiming(MEMDELAY mem_delay, COMDELAY common_delay);
void RecalculateMemoryTimings();
template<MemoryAccessType type, MemoryAccessSize size>
bool DoRAMAccess(u32 offset, u32& value);
@ -172,6 +204,10 @@ private:
SPU* m_spu = nullptr;
MDEC* m_mdec = nullptr;
std::array<TickCount, 3> m_bios_access_time = {};
std::array<TickCount, 3> m_cdrom_access_time = {};
std::array<TickCount, 3> m_spu_access_time = {};
std::array<u8, 2097152> m_ram{}; // 2MB RAM
std::array<u8, 524288> m_bios{}; // 512K BIOS ROM
std::vector<u8> m_exp1_rom;