chore: improve io.zig
This commit is contained in:
parent
4afcbd0957
commit
0f74e4fcf9
197
src/bus/io.zig
197
src/bus/io.zig
|
|
@ -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 }),
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue