304 lines
12 KiB
Zig
304 lines
12 KiB
Zig
const std = @import("std");
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const Bit = @import("bitfield").Bit;
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const Bitfield = @import("bitfield").Bitfield;
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const Bus = @import("../Bus.zig");
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const log = std.log.scoped(.@"I/O");
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pub const Io = struct {
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const Self = @This();
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/// Read / Write
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ime: bool,
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ie: InterruptEnable,
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irq: InterruptRequest,
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postflg: PostFlag,
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is_halted: bool,
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keyinput: KeyInput,
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pub fn init() Self {
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return .{
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.ime = false,
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.ie = .{ .raw = 0x0000 },
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.irq = .{ .raw = 0x0000 },
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.postflg = .{ .raw = 0x00 },
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.keyinput = .{ .raw = 0x03FF },
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.is_halted = false,
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};
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}
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};
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pub fn read32(bus: *const Bus, addr: u32) u32 {
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return switch (addr) {
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0x0400_0000 => bus.ppu.dispcnt.raw,
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0x0400_0004 => bus.ppu.dispstat.raw,
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0x0400_0006 => bus.ppu.vcount.raw,
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0x0400_0200 => bus.io.ie.raw,
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0x0400_0208 => @boolToInt(bus.io.ime),
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0x0400_00C4 => failed_read("Tried to read word from DMA1CNT", .{}),
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0x0400_00D0 => failed_read("Tried to read word from DMA2CNT", .{}),
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else => std.debug.panic("Tried to read word from 0x{X:0>8}", .{addr}),
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};
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}
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pub fn write32(bus: *Bus, addr: u32, word: u32) void {
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switch (addr) {
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0x0400_0000 => bus.ppu.dispcnt.raw = @truncate(u16, word),
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0x0400_0004 => {
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bus.ppu.dispstat.raw = @truncate(u16, word);
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bus.ppu.vcount.raw = @truncate(u16, word >> 16);
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},
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0x0400_0008 => {
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bus.ppu.bg[0].cnt.raw = @truncate(u16, word);
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bus.ppu.bg[1].cnt.raw = @truncate(u16, word >> 16);
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},
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0x0400_000C => {
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bus.ppu.bg[2].cnt.raw = @truncate(u16, word);
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bus.ppu.bg[3].cnt.raw = @truncate(u16, word >> 16);
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},
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0x0400_0010 => {
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bus.ppu.bg[0].hofs.raw = @truncate(u16, word);
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bus.ppu.bg[0].vofs.raw = @truncate(u16, word >> 16);
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},
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0x0400_0014 => {
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bus.ppu.bg[1].hofs.raw = @truncate(u16, word);
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bus.ppu.bg[1].vofs.raw = @truncate(u16, word >> 16);
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},
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0x0400_0018 => {
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bus.ppu.bg[2].hofs.raw = @truncate(u16, word);
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bus.ppu.bg[2].vofs.raw = @truncate(u16, word >> 16);
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},
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0x0400_001C => {
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bus.ppu.bg[3].hofs.raw = @truncate(u16, word);
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bus.ppu.bg[3].vofs.raw = @truncate(u16, word >> 16);
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},
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0x0400_00BC => log.warn("Wrote 0x{X:0>8} to DMA1SAD", .{word}),
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0x0400_00C0 => log.warn("Wrote 0x{X:0>8} to DMA1DAD", .{word}),
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0x0400_00C8 => log.warn("Wrote 0x{X:0>8} to DMA2SAD", .{word}),
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0x0400_00CC => log.warn("Wrote 0x{X:0>8} to DMA2DAD", .{word}),
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0x0400_0200 => bus.io.ie.raw = @truncate(u16, word),
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0x0400_0204 => log.warn("Wrote 0x{X:0>8} to WAITCNT", .{word}),
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0x0400_0208 => bus.io.ime = word & 1 == 1,
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else => std.debug.panic("Tried to write 0x{X:0>8} to 0x{X:0>8}", .{ word, addr }),
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}
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}
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pub fn read16(bus: *const Bus, addr: u32) u16 {
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return switch (addr) {
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0x0400_0000 => bus.ppu.dispcnt.raw,
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0x0400_0004 => bus.ppu.dispstat.raw,
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0x0400_0006 => bus.ppu.vcount.raw,
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0x0400_0130 => bus.io.keyinput.raw,
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0x0400_0200 => bus.io.ie.raw,
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0x0400_0208 => @boolToInt(bus.io.ime),
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0x0400_0102 => failed_read("Tried to read halfword from TM0CNT_H", .{}),
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0x0400_0106 => failed_read("Tried to read halfword from TM1CNT_H", .{}),
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0x0400_010A => failed_read("Tried to read halfword from TM2CNT_H", .{}),
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0x0400_010E => failed_read("Tried to read halfword from TM3CNT_H", .{}),
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0x0400_0204 => failed_read("Tried to read halfword from WAITCNT", .{}),
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else => std.debug.panic("Tried to read halfword from 0x{X:0>8}", .{addr}),
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};
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}
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pub fn write16(bus: *Bus, addr: u32, halfword: u16) void {
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switch (addr) {
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0x0400_0000 => bus.ppu.dispcnt.raw = halfword,
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0x0400_0004 => bus.ppu.dispstat.raw = halfword,
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0x0400_0008...0x0400_000F => bus.ppu.bg[addr & 0x3].cnt.raw = halfword,
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0x0400_0010 => bus.ppu.bg[0].hofs.raw = halfword, // TODO: Don't write out every HOFS / VOFS?
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0x0400_0012 => bus.ppu.bg[0].vofs.raw = halfword,
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0x0400_0014 => bus.ppu.bg[1].hofs.raw = halfword,
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0x0400_0016 => bus.ppu.bg[1].vofs.raw = halfword,
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0x0400_0018 => bus.ppu.bg[2].hofs.raw = halfword,
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0x0400_001A => bus.ppu.bg[2].vofs.raw = halfword,
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0x0400_001C => bus.ppu.bg[3].hofs.raw = halfword,
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0x0400_001E => bus.ppu.bg[3].vofs.raw = halfword,
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0x0400_0040 => log.warn("Wrote 0x{X:0>4} to WIN0H", .{halfword}),
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0x0400_0042 => log.warn("Wrote 0x{X:0>4} to WIN1H", .{halfword}),
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0x0400_0044 => log.warn("Wrote 0x{X:0>4} to WIN0V", .{halfword}),
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0x0400_0046 => log.warn("Wrote 0x{X:0>4} to WIN1V", .{halfword}),
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0x0400_0048 => log.warn("Wrote 0x{X:0>4} to WININ", .{halfword}),
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0x0400_004A => log.warn("Wrote 0x{X:0>4} to WINOUT", .{halfword}),
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0x0400_004C => log.warn("Wrote 0x{X:0>4} to MOSAIC", .{halfword}),
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0x0400_0050 => log.warn("Wrote 0x{X:0>4} to BLDCNT", .{halfword}),
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0x0400_0052 => log.warn("Wrote 0x{X:0>4} to BLDALPHA", .{halfword}),
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0x0400_0054 => log.warn("Wrote 0x{X:0>4} to BLDY", .{halfword}),
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0x0400_0080 => log.warn("Wrote 0x{X:0>4} to SOUNDCNT_L", .{halfword}),
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0x0400_0082 => log.warn("Wrote 0x{X:0>4} to SOUNDCNT_H", .{halfword}),
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0x0400_0084 => log.warn("Wrote 0x{X:0>4} to SOUNDCNT_X", .{halfword}),
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0x0400_00BA => log.warn("Wrote 0x{X:0>4} to DMA0CNT_H", .{halfword}),
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0x0400_00C6 => log.warn("Wrote 0x{X:0>4} to DMA1CNT_H", .{halfword}),
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0x0400_00D2 => log.warn("Wrote 0x{X:0>4} to DMA2CNT_H", .{halfword}),
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0x0400_00DE => log.warn("Wrote 0x{X:0>4} to DMA3CNT_H", .{halfword}),
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0x0400_0100 => log.warn("Wrote 0x{X:0>4} to TM0CNT_L", .{halfword}),
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0x0400_0102 => log.warn("Wrote 0x{X:0>4} to TM0CNT_H", .{halfword}),
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0x0400_0104 => log.warn("Wrote 0x{X:0>4} to TM1CNT_L", .{halfword}),
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0x0400_0106 => log.warn("Wrote 0x{X:0>4} to TM1CNT_H", .{halfword}),
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0x0400_0108 => log.warn("Wrote 0x{X:0>4} to TM2CNT_L", .{halfword}),
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0x0400_010A => log.warn("Wrote 0x{X:0>4} to TM2CNT_H", .{halfword}),
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0x0400_010C => log.warn("Wrote 0x{X:0>4} to TM3CNT_L", .{halfword}),
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0x0400_010E => log.warn("Wrote 0x{X:0>4} to TM3CNT_H", .{halfword}),
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0x0400_0120 => log.warn("Wrote 0x{X:0>4} to SIOMULTI0", .{halfword}),
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0x0400_0122 => log.warn("Wrote 0x{X:0>4} to SIOMULTI1", .{halfword}),
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0x0400_0124 => log.warn("Wrote 0x{X:0>4} to SIOMULTI2", .{halfword}),
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0x0400_0126 => log.warn("Wrote 0x{X:0>4} to SIOMULTI3", .{halfword}),
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0x0400_0128 => log.warn("Wrote 0x{X:0>4} to SIOCNT", .{halfword}),
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0x0400_012A => log.warn("Wrote 0x{X:0>4} to SIOMLT_SEND", .{halfword}),
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0x0400_0130 => log.warn("Wrote 0x{X:0>4} to KEYINPUT. Ignored", .{halfword}),
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0x0400_0132 => log.warn("Wrote 0x{X:0>4} to KEYCNT", .{halfword}),
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0x0400_0134 => log.warn("Wrote 0x{X:0>4} to RCNT", .{halfword}),
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0x0400_0200 => bus.io.ie.raw = halfword,
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0x0400_0202 => bus.io.irq.raw &= ~halfword,
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0x0400_0204 => log.warn("Wrote 0x{X:0>4} to WAITCNT", .{halfword}),
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0x0400_0208 => bus.io.ime = halfword & 1 == 1,
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else => std.debug.panic("Tried to write 0x{X:0>4} to 0x{X:0>8}", .{ halfword, addr }),
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}
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}
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pub fn read8(bus: *const Bus, addr: u32) u8 {
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return switch (addr) {
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0x0400_0000 => @truncate(u8, bus.ppu.dispcnt.raw),
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0x0400_0004 => @truncate(u8, bus.ppu.dispstat.raw),
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0x0400_0200 => @truncate(u8, bus.io.ie.raw),
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0x0400_0300 => bus.io.postflg.raw,
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0x0400_0006 => @truncate(u8, bus.ppu.vcount.raw),
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0x0400_0089 => failed_read("Tried to read (high) byte from SOUNDBIAS", .{}),
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else => std.debug.panic("Tried to read byte from 0x{X:0>8}", .{addr}),
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};
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}
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pub fn write8(self: *Bus, addr: u32, byte: u8) void {
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switch (addr) {
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0x0400_0208 => self.io.ime = byte & 1 == 1,
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0x0400_0301 => self.io.is_halted = byte >> 7 & 1 == 0, // TODO: Implement Stop?
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0x0400_0063 => log.warn("Tried to write 0x{X:0>2} to SOUND1CNT_H (high)", .{byte}),
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0x0400_0065 => log.warn("Tried to write 0x{X:0>2} to SOUND1CNT_X (high)", .{byte}),
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0x0400_0069 => log.warn("Tried to write 0x{X:0>2} to SOUND2CNT_L (high)", .{byte}),
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0x0400_006D => log.warn("Tried to write 0x{X:0>2} to SOUND2CNT_H (high)", .{byte}),
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0x0400_0070 => log.warn("Tried to write 0x{X:0>2} to SOUND3CNT_L (low)", .{byte}),
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0x0400_0079 => log.warn("Tried to write 0x{X:0>2} to SOUND4CNT_L (high)", .{byte}),
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0x0400_007D => log.warn("Tried to write 0x{X:0>2} to SOUND4CNT_H (high)", .{byte}),
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0x0400_0080 => log.warn("Tried to write 0x{X:0>2} to SOUNDCNT_L (low)", .{byte}),
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0x0400_0089 => log.warn("Tried to write 0x{X:0>2} to SOUNDBIAS (high)", .{byte}),
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else => std.debug.panic("Tried to write 0x{X:0>2} to 0x{X:0>8}", .{ byte, addr }),
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}
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}
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fn failed_read(comptime format: []const u8, args: anytype) u8 {
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log.warn(format, args);
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return 0;
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}
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/// Read / Write
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pub const PostFlag = extern union {
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/// 0 if First Boot, 1 if a Reset has been done
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not_first_boot: Bit(u8, 0),
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raw: u8,
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};
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/// Read / Write
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pub const DisplayControl = extern union {
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bg_mode: Bitfield(u16, 0, 3),
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frame_select: Bit(u16, 4),
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hblank_interval_free: Bit(u16, 5),
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obj_mapping: Bit(u16, 6),
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forced_blank: Bit(u16, 7),
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bg_enable: Bitfield(u16, 8, 4),
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obj_enable: Bit(u16, 12),
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win_enable: Bitfield(u16, 13, 2),
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obj_win_enable: Bit(u16, 15),
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raw: u16,
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};
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/// Read / Write
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pub const DisplayStatus = extern union {
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vblank: Bit(u16, 0),
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hblank: Bit(u16, 1),
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coincidence: Bit(u16, 2),
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vblank_irq: Bit(u16, 3),
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hblank_irq: Bit(u16, 4),
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vcount_irq: Bit(u16, 5),
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vcount_trigger: Bitfield(u16, 8, 8),
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raw: u16,
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};
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/// Read Only
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pub const VCount = extern union {
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scanline: Bitfield(u16, 0, 8),
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raw: u16,
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};
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/// Read / Write
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const InterruptEnable = extern union {
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vblank: Bit(u16, 0),
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hblank: Bit(u16, 1),
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coincidence: Bit(u16, 2),
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tm0_overflow: Bit(u16, 3),
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tm1_overflow: Bit(u16, 4),
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tm2_overflow: Bit(u16, 5),
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tm3_overflow: Bit(u16, 6),
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serial: Bit(u16, 7),
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dma0: Bit(u16, 8),
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dma1: Bit(u16, 9),
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dma2: Bit(u16, 10),
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dma3: Bit(u16, 11),
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keypad: Bit(u16, 12),
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game_pak: Bit(u16, 13),
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raw: u16,
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};
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/// Read Only
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/// 0 = Pressed, 1 = Released
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const KeyInput = extern union {
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a: Bit(u16, 0),
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b: Bit(u16, 1),
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select: Bit(u16, 2),
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start: Bit(u16, 3),
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right: Bit(u16, 4),
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left: Bit(u16, 5),
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up: Bit(u16, 6),
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down: Bit(u16, 7),
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shoulder_r: Bit(u16, 8),
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shoulder_l: Bit(u16, 9),
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raw: u16,
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};
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// Read / Write
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pub const BackgroundControl = extern union {
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priority: Bitfield(u16, 0, 2),
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char_base: Bitfield(u16, 2, 2),
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mosaic_enable: Bit(u16, 6),
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colour_mode: Bit(u16, 7),
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screen_base: Bitfield(u16, 8, 5),
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display_overflow: Bit(u16, 13),
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size: Bitfield(u16, 14, 2),
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raw: u16,
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};
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/// Write Only
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pub const BackgroundOffset = extern union {
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offset: Bitfield(u16, 0, 9),
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raw: u16,
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};
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/// Read / Write
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const InterruptRequest = extern union {
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vblank: Bit(u16, 0),
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hblank: Bit(u16, 1),
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coincidence: Bit(u16, 2),
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tim0_overflow: Bit(u16, 3),
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tim1_overflow: Bit(u16, 4),
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tim2_overflow: Bit(u16, 5),
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tim3_overflow: Bit(u16, 6),
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serial: Bit(u16, 7),
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dma0: Bit(u16, 8),
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dma1: Bit(u16, 9),
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dma2: Bit(u16, 10),
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dma3: Bit(u16, 11),
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keypad: Bit(u16, 12),
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game_pak: Bit(u16, 13),
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raw: u16,
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};
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