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chore: improve io.zig

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-02-19 10:59:59 -05:00
parent 9e2e8c3d1a
commit c767e88e8d
1 changed files with 111 additions and 86 deletions
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197
src/bus/io.zig
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@@ -4,6 +4,8 @@ const Bit = @import("bitfield").Bit;
const Bitfield = @import("bitfield").Bitfield;
const Bus = @import("../Bus.zig");
const log = std.log.scoped(.@"I/O");
pub const Io = struct {
const Self = @This();
@@ -11,6 +13,7 @@ pub const Io = struct {
ime: bool,
ie: InterruptEnable,
irq: InterruptRequest,
postflg: PostFlag,
is_halted: bool,
keyinput: KeyInput,
@@ -20,12 +23,120 @@ pub const Io = struct {
.ime = false,
.ie = .{ .raw = 0x0000 },
.irq = .{ .raw = 0x0000 },
.postflg = .{ .raw = 0x00 },
.keyinput = .{ .raw = 0x03FF },
.is_halted = false,
};
}
};
pub fn read32(bus: *const Bus, addr: u32) u32 {
return switch (addr) {
0x0400_0000 => bus.ppu.dispcnt.raw,
0x0400_0004 => bus.ppu.dispstat.raw,
0x0400_0006 => bus.ppu.vcount.raw,
0x0400_0200 => bus.io.ie.raw,
0x0400_0208 => @boolToInt(bus.io.ime),
else => std.debug.panic("Tried to read from {X:0>8}", .{addr}),
};
}
pub fn write32(bus: *Bus, addr: u32, word: u32) void {
switch (addr) {
0x0400_0000 => bus.ppu.dispcnt.raw = @truncate(u16, word),
0x0400_0004 => {
bus.ppu.dispstat.raw = @truncate(u16, word);
bus.ppu.vcount.raw = @truncate(u16, word >> 16);
},
0x0400_0008 => {
bus.ppu.bg[0].cnt.raw = @truncate(u16, word);
bus.ppu.bg[1].cnt.raw = @truncate(u16, word >> 16);
},
0x0400_000C => {
bus.ppu.bg[2].cnt.raw = @truncate(u16, word);
bus.ppu.bg[3].cnt.raw = @truncate(u16, word >> 16);
},
0x0400_0010 => {
bus.ppu.bg[0].hofs.raw = @truncate(u16, word);
bus.ppu.bg[0].vofs.raw = @truncate(u16, word >> 16);
},
0x0400_0014 => {
bus.ppu.bg[1].hofs.raw = @truncate(u16, word);
bus.ppu.bg[1].vofs.raw = @truncate(u16, word >> 16);
},
0x0400_0018 => {
bus.ppu.bg[2].hofs.raw = @truncate(u16, word);
bus.ppu.bg[2].vofs.raw = @truncate(u16, word >> 16);
},
0x0400_001C => {
bus.ppu.bg[3].hofs.raw = @truncate(u16, word);
bus.ppu.bg[3].vofs.raw = @truncate(u16, word >> 16);
},
0x0400_0200 => bus.io.ie.raw = @truncate(u16, word),
0x0400_0204 => log.warn("Wrote 0x{X:0>8} to WAITCNT", .{word}),
0x0400_0208 => bus.io.ime = word & 1 == 1,
else => std.debug.panic("Tried to write 0x{X:0>8} to 0x{X:0>8}", .{ word, addr }),
}
}
pub fn read16(bus: *const Bus, addr: u32) u16 {
return switch (addr) {
0x0400_0000 => bus.ppu.dispcnt.raw,
0x0400_0004 => bus.ppu.dispstat.raw,
0x0400_0006 => bus.ppu.vcount.raw,
0x0400_0130 => bus.io.keyinput.raw,
0x0400_0200 => bus.io.ie.raw,
0x0400_0208 => @boolToInt(bus.io.ime),
else => std.debug.panic("Tried to read from {X:0>4}", .{addr}),
};
}
pub fn write16(bus: *Bus, addr: u32, halfword: u16) void {
switch (addr) {
0x0400_0000 => bus.ppu.dispcnt.raw = halfword,
0x0400_0004 => bus.ppu.dispstat.raw = halfword,
0x0400_0008...0x0400_000F => bus.ppu.bg[addr & 0x7].cnt.raw = halfword,
0x0400_0010 => bus.ppu.bg[0].hofs.raw = halfword, // TODO: Don't write out every HOFS / VOFS?
0x0400_0012 => bus.ppu.bg[0].vofs.raw = halfword,
0x0400_0014 => bus.ppu.bg[1].hofs.raw = halfword,
0x0400_0016 => bus.ppu.bg[1].vofs.raw = halfword,
0x0400_0018 => bus.ppu.bg[2].hofs.raw = halfword,
0x0400_001A => bus.ppu.bg[2].vofs.raw = halfword,
0x0400_001C => bus.ppu.bg[3].hofs.raw = halfword,
0x0400_001E => bus.ppu.bg[3].vofs.raw = halfword,
0x0400_0200 => bus.io.ie.raw = halfword,
0x0400_0202 => bus.io.irq.raw = halfword,
0x0400_0208 => bus.io.ime = halfword & 1 == 1,
else => std.debug.panic("Tried to write 0x{X:0>4} to 0x{X:0>8}", .{ halfword, addr }),
}
}
pub fn read8(bus: *const Bus, addr: u32) u8 {
return switch (addr) {
0x0400_0000 => @truncate(u8, bus.ppu.dispcnt.raw),
0x0400_0004 => @truncate(u8, bus.ppu.dispstat.raw),
0x0400_0200 => @truncate(u8, bus.io.ie.raw),
0x0400_0300 => bus.io.postflg.raw,
0x0400_0006 => @truncate(u8, bus.ppu.vcount.raw),
else => std.debug.panic("Tried to read from 0x{X:0>8}", .{addr}),
};
}
pub fn write8(self: *Bus, addr: u32, byte: u8) void {
switch (addr) {
0x0400_0208 => self.io.ime = byte & 1 == 1,
0x0400_0301 => self.io.is_halted = byte >> 7 & 1 == 0, // TODO: Implement Stop?
else => std.debug.panic("Tried to write 0x{X:0>2} to 0x{X:0>8}", .{ byte, addr }),
}
}
/// Read / Write
pub const PostFlag = extern union {
/// 0 if First Boot, 1 if a Reset has been done
not_first_boot: Bit(u8, 0),
raw: u8,
};
/// Read / Write
pub const DisplayControl = extern union {
bg_mode: Bitfield(u16, 0, 3),
@@ -129,89 +240,3 @@ const InterruptRequest = extern union {
game_pak: Bit(u16, 13),
raw: u16,
};
pub fn read32(bus: *const Bus, addr: u32) u32 {
return switch (addr) {
0x0400_0000 => bus.ppu.dispcnt.raw,
0x0400_0004 => bus.ppu.dispstat.raw,
0x0400_0006 => bus.ppu.vcount.raw,
0x0400_0200 => bus.io.ie.raw,
0x0400_0208 => @boolToInt(bus.io.ime),
else => std.debug.panic("[Io:32] tried to read from {X:}", .{addr}),
};
}
pub fn write32(bus: *Bus, addr: u32, word: u32) void {
switch (addr) {
0x0400_0000 => bus.ppu.dispcnt.raw = @truncate(u16, word),
0x0400_0010 => {
bus.ppu.bg[0].hofs.raw = @truncate(u16, word);
bus.ppu.bg[0].vofs.raw = @truncate(u16, word >> 16);
},
0x0400_0014 => {
bus.ppu.bg[1].hofs.raw = @truncate(u16, word);
bus.ppu.bg[1].vofs.raw = @truncate(u16, word >> 16);
},
0x0400_0018 => {
bus.ppu.bg[2].hofs.raw = @truncate(u16, word);
bus.ppu.bg[2].vofs.raw = @truncate(u16, word >> 16);
},
0x0400_001C => {
bus.ppu.bg[3].hofs.raw = @truncate(u16, word);
bus.ppu.bg[3].vofs.raw = @truncate(u16, word >> 16);
},
0x0400_0200 => bus.io.ie.raw = @truncate(u16, word),
0x0400_0208 => bus.io.ime = word & 1 == 1,
else => std.debug.panic("[Io:32] tried to write 0x{X:} to 0x{X:}", .{ word, addr }),
}
}
pub fn read16(bus: *const Bus, addr: u32) u16 {
return switch (addr) {
0x0400_0000 => bus.ppu.dispcnt.raw,
0x0400_0004 => bus.ppu.dispstat.raw,
0x0400_0006 => bus.ppu.vcount.raw,
0x0400_0130 => bus.io.keyinput.raw,
0x0400_0200 => bus.io.ie.raw,
0x0400_0208 => @boolToInt(bus.io.ime),
else => std.debug.panic("[Io:16] tried to read from {X:}", .{addr}),
};
}
pub fn write16(bus: *Bus, addr: u32, halfword: u16) void {
switch (addr) {
0x0400_0000 => bus.ppu.dispcnt.raw = halfword,
0x0400_0004 => bus.ppu.dispstat.raw = halfword,
0x0400_0008...0x0400_000F => bus.ppu.bg[addr & 0x7].cnt.raw = halfword,
0x0400_0010 => bus.ppu.bg[0].hofs.raw = halfword, // TODO: Don't write out every HOFS / VOFS?
0x0400_0012 => bus.ppu.bg[0].vofs.raw = halfword,
0x0400_0014 => bus.ppu.bg[1].hofs.raw = halfword,
0x0400_0016 => bus.ppu.bg[1].vofs.raw = halfword,
0x0400_0018 => bus.ppu.bg[2].hofs.raw = halfword,
0x0400_001A => bus.ppu.bg[2].vofs.raw = halfword,
0x0400_001C => bus.ppu.bg[3].hofs.raw = halfword,
0x0400_001E => bus.ppu.bg[3].vofs.raw = halfword,
0x0400_0200 => bus.io.ie.raw = halfword,
0x0400_0202 => bus.io.irq.raw = halfword,
0x0400_0208 => bus.io.ime = halfword & 1 == 1,
else => std.debug.panic("[Io:16] tried to write 0x{X:} to 0x{X:}", .{ halfword, addr }),
}
}
pub fn read8(bus: *const Bus, addr: u32) u8 {
return switch (addr) {
0x0400_0000 => @truncate(u8, bus.ppu.dispcnt.raw),
0x0400_0004 => @truncate(u8, bus.ppu.dispstat.raw),
0x0400_0200 => @truncate(u8, bus.io.ie.raw),
0x0400_0006 => @truncate(u8, bus.ppu.vcount.raw),
else => std.debug.panic("[Io:8] tried to read from {X:}", .{addr}),
};
}
pub fn write8(self: *Bus, addr: u32, byte: u8) void {
switch (addr) {
0x0400_0208 => self.io.ime = byte & 1 == 1,
0x0400_0301 => self.io.is_halted = byte >> 7 & 1 == 0, // TODO: Implement Stop?
else => std.debug.panic("[Io:8] tried to write 0x{X:} to 0x{X:}", .{ byte, addr }),
}
}