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bus: use a switch case for memory access

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Signed-off-by: Amneesh Singh <natto@weirdnatto.in>
This commit is contained in:
Amneesh Singh
2024-06-14 20:47:04 +05:30
parent 08060a767f
commit cb75ebf8ef
2 changed files with 40 additions and 17 deletions
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53
src/bus.cc
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@@ -41,21 +41,36 @@ Bus::init(std::array<uint8_t, BIOS_SIZE>&& bios, std::vector<uint8_t>&& rom) {
template<unsigned int N>
std::optional<std::span<const uint8_t>>
Bus::read(uint32_t address) const {
switch (address >> 24 & 0xFF) {
#define MATCHES(AREA, area) \
if (address >= AREA##_START && address < AREA##_START + area.size()) \
case AREA##_REGION: \
if (address > AREA##_START + area.size() - N) \
break; \
return std::span<const uint8_t>(&area[address - AREA##_START], N);
MATCHES(BIOS, bios)
MATCHES(BOARD_WRAM, board_wram)
MATCHES(CHIP_WRAM, chip_wram)
MATCHES(PALETTE_RAM, palette_ram)
MATCHES(VRAM, vram)
MATCHES(OAM_OBJ_ATTR, oam_obj_attr)
MATCHES(ROM_0, rom)
MATCHES(ROM_1, rom)
MATCHES(ROM_2, rom)
#define MATCHES_PAK(AREA, area) \
case AREA##_REGION: \
case AREA##_REGION + 1: \
if (address > AREA##_START + area.size() - N) \
break; \
return std::span<const uint8_t>(&area[address - AREA##_START], N);
MATCHES(BIOS, bios)
MATCHES(BOARD_WRAM, board_wram)
MATCHES(CHIP_WRAM, chip_wram)
MATCHES(PALETTE_RAM, palette_ram)
MATCHES(VRAM, vram)
MATCHES(OAM_OBJ_ATTR, oam_obj_attr)
MATCHES_PAK(ROM_0, rom)
MATCHES_PAK(ROM_1, rom)
MATCHES_PAK(ROM_2, rom)
#undef MATCHES_PAK
#undef MATCHES
}
glogger.error("Invalid memory region read");
return {};
@@ -64,17 +79,23 @@ Bus::read(uint32_t address) const {
template<unsigned int N>
std::optional<std::span<uint8_t>>
Bus::write(uint32_t address) {
switch (address >> 24 & 0xFF) {
#define MATCHES(AREA, area) \
if (address >= AREA##_START && address < AREA##_START + area.size()) \
case AREA##_REGION: \
if (address > AREA##_START + area.size() - N) \
break; \
return std::span<uint8_t>(&area[address - AREA##_START], N);
MATCHES(BOARD_WRAM, board_wram)
MATCHES(CHIP_WRAM, chip_wram)
MATCHES(PALETTE_RAM, palette_ram)
MATCHES(VRAM, vram)
MATCHES(OAM_OBJ_ATTR, oam_obj_attr)
MATCHES(BOARD_WRAM, board_wram)
MATCHES(CHIP_WRAM, chip_wram)
MATCHES(PALETTE_RAM, palette_ram)
MATCHES(VRAM, vram)
MATCHES(OAM_OBJ_ATTR, oam_obj_attr)
#undef MATCHES
}
glogger.error("Invalid memory region written");
return {};