66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
#pragma once
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#include "header.hh"
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#include <array>
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#include <cstddef>
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#include <cstdint>
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#include <unordered_map>
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#include <vector>
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class Memory {
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public:
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static constexpr size_t BIOS_SIZE = 1024 * 16;
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Memory(std::array<uint8_t, BIOS_SIZE>&& bios, std::vector<uint8_t>&& rom);
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uint8_t read(size_t address) const;
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void write(size_t address, uint8_t byte);
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uint16_t read_halfword(size_t address) const;
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void write_halfword(size_t address, uint16_t halfword);
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uint32_t read_word(size_t address) const;
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void write_word(size_t address, uint32_t word);
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private:
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#define MEMORY_REGION(name, start, end) \
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static constexpr size_t name##_START = start; \
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static constexpr size_t name##_END = end;
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#define DECL_MEMORY(name, ident, start, end) \
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MEMORY_REGION(name, start, end) \
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std::array<uint8_t, name##_END - name##_START + 1> ident;
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MEMORY_REGION(BIOS, 0x00000000, 0x00003FFF)
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std::array<uint8_t, BIOS_SIZE> bios;
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static_assert(BIOS_END - BIOS_START + 1 == BIOS_SIZE);
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// board working RAM
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DECL_MEMORY(BOARD_WRAM, board_wram, 0x02000000, 0x0203FFFF)
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// chip working RAM
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DECL_MEMORY(CHIP_WRAM, chip_wram, 0x03000000, 0x03007FFF)
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// palette RAM
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DECL_MEMORY(PALETTE_RAM, palette_ram, 0x05000000, 0x050003FF)
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// video RAM
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DECL_MEMORY(VRAM, vram, 0x06000000, 0x06017FFF)
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// OAM OBJ attributes
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DECL_MEMORY(OAM_OBJ_ATTR, oam_obj_attr, 0x07000000, 0x070003FF)
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#undef DECL_MEMORY
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MEMORY_REGION(ROM_0, 0x08000000, 0x09FFFFFF)
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MEMORY_REGION(ROM_1, 0x0A000000, 0x0BFFFFFF)
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MEMORY_REGION(ROM_2, 0x0C000000, 0x0DFFFFFF)
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#undef MEMORY_REGION
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std::unordered_map<size_t, uint8_t> invalid_mem;
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std::vector<uint8_t> rom;
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Header header;
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void parse_header();
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};
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