78002be334
* DSP: Own DSP RAM and add it to fastmem * Vendor Teakra * Add MacOS support to fastmem * Fix MacOS fastmem paths * Fix iOS build
74 lines
2.2 KiB
C++
74 lines
2.2 KiB
C++
#pragma once
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#include <array>
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#include "common_types.h"
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#include "crash.h"
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namespace Teakra {
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class MemoryInterfaceUnit {
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public:
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u16 x_page = 0, y_page = 0, z_page = 0;
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static constexpr u16 XYSizeResolution = 0x400;
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std::array<u16, 2> x_size{{0x20, 0x20}};
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std::array<u16, 2> y_size{{0x1E, 0x1E}};
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u16 page_mode = 0;
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u16 mmio_base = 0x8000;
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static constexpr u16 MMIOSize = 0x0800;
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static constexpr u32 DataMemoryOffset = 0x20000;
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static constexpr u32 DataMemoryBankSize = 0x10000;
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void Reset() {
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*this = MemoryInterfaceUnit();
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}
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bool InMMIO(u16 addr) const {
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return addr >= mmio_base && addr < mmio_base + MMIOSize;
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}
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u16 ToMMIO(u16 addr) const {
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ASSERT(z_page == 0);
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// according to GBATek ("DSi Teak I/O Ports (on ARM9 Side)"), these are mirrored
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return (addr - mmio_base) & (MMIOSize - 1);
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}
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u32 ConvertDataAddress(u16 addr) const {
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if (page_mode == 0) {
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ASSERT(z_page < 2);
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return DataMemoryOffset + addr + z_page * DataMemoryBankSize;
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} else {
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if (addr <= x_size[0] * XYSizeResolution) {
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ASSERT(x_page < 2);
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return DataMemoryOffset + addr + x_page * DataMemoryBankSize;
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} else {
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ASSERT(y_page < 2);
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return DataMemoryOffset + addr + y_page * DataMemoryBankSize;
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}
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}
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}
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};
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struct SharedMemory;
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class MMIORegion;
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class MemoryInterface {
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public:
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MemoryInterface(SharedMemory& shared_memory, MemoryInterfaceUnit& memory_interface_unit);
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void SetMMIO(MMIORegion& mmio);
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u16 ProgramRead(u32 address) const;
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void ProgramWrite(u32 address, u16 value);
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u16 DataRead(u16 address, bool bypass_mmio = false); // not const because it can be a FIFO register
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void DataWrite(u16 address, u16 value, bool bypass_mmio = false);
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u16 DataReadA32(u32 address) const;
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void DataWriteA32(u32 address, u16 value);
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u16 MMIORead(u16 address);
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void MMIOWrite(u16 address, u16 value);
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private:
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SharedMemory& shared_memory;
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MemoryInterfaceUnit& memory_interface_unit;
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MMIORegion* mmio;
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};
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} // namespace Teakra
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