chore: improve io.zig
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9e2e8c3d1a
commit
c767e88e8d
197
src/bus/io.zig
197
src/bus/io.zig
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@ -4,6 +4,8 @@ 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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@ -11,6 +13,7 @@ pub const Io = struct {
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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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@ -20,12 +23,120 @@ pub const Io = struct {
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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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else => std.debug.panic("Tried to read from {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_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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else => std.debug.panic("Tried to read from {X:0>4}", .{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 & 0x7].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_0200 => bus.io.ie.raw = halfword,
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0x0400_0202 => bus.io.irq.raw = 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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else => std.debug.panic("Tried to read 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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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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/// 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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@ -129,89 +240,3 @@ const InterruptRequest = extern union {
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game_pak: Bit(u16, 13),
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raw: u16,
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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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else => std.debug.panic("[Io:32] tried to read from {X:}", .{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_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_0200 => bus.io.ie.raw = @truncate(u16, word),
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0x0400_0208 => bus.io.ime = word & 1 == 1,
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else => std.debug.panic("[Io:32] tried to write 0x{X:} to 0x{X:}", .{ 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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else => std.debug.panic("[Io:16] tried to read from {X:}", .{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 & 0x7].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_0200 => bus.io.ie.raw = halfword,
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0x0400_0202 => bus.io.irq.raw = halfword,
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0x0400_0208 => bus.io.ime = halfword & 1 == 1,
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else => std.debug.panic("[Io:16] tried to write 0x{X:} to 0x{X:}", .{ 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_0006 => @truncate(u8, bus.ppu.vcount.raw),
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else => std.debug.panic("[Io:8] tried to read from {X:}", .{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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else => std.debug.panic("[Io:8] tried to write 0x{X:} to 0x{X:}", .{ byte, addr }),
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}
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}
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