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fix(io): account for read-only bit in WAITCNT

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-11-02 08:06:19 -03:00
parent 102b2c946b
commit b8a5fb95c1
1 changed files with 9 additions and 5 deletions
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14
src/core/bus/io.zig
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@ -32,7 +32,7 @@ pub const Io = struct {
.ie = .{ .raw = 0x0000 },
.irq = .{ .raw = 0x0000 },
.keyinput = .{ .raw = 0x03FF },
.waitcnt = .{ .raw = 0x0000_0000 },
.waitcnt = .{ .raw = 0x0000_0000 }, // Bit 15 == 0 for GBA
.postflg = .FirstBoot,
.haltcnt = .Execute,
};
@ -192,7 +192,7 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
// Interrupts
0x0400_0200 => bus.io.setIrqs(value),
0x0400_0204 => bus.io.waitcnt.raw = @truncate(u16, value),
0x0400_0204 => bus.io.waitcnt.set(@truncate(u16, value)),
0x0400_0208 => bus.io.ime = value & 1 == 1,
0x0400_0300 => {
bus.io.postflg = @intToEnum(PostFlag, value & 1);
@ -237,7 +237,7 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
// Interrupts
0x0400_0200 => bus.io.ie.raw = value,
0x0400_0202 => bus.io.irq.raw &= ~value,
0x0400_0204 => bus.io.waitcnt.raw = value,
0x0400_0204 => bus.io.waitcnt.set(value),
0x0400_0206 => {},
0x0400_0208 => bus.io.ime = value & 1 == 1,
0x0400_020A => {},
@ -272,7 +272,7 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
0x0400_0200, 0x0400_0201 => bus.io.ie.raw = setHalf(u16, bus.io.ie.raw, @truncate(u8, address), value),
0x0400_0202 => bus.io.irq.raw &= ~@as(u16, value),
0x0400_0203 => bus.io.irq.raw &= ~@as(u16, value) << 8, // TODO: Is this good?
0x0400_0204, 0x0400_0205 => bus.io.waitcnt.raw = setHalf(u16, @truncate(u16, bus.io.waitcnt.raw), @truncate(u8, address), value),
0x0400_0204, 0x0400_0205 => bus.io.waitcnt.set(setHalf(u16, @truncate(u16, bus.io.waitcnt.raw), @truncate(u8, address), value)),
0x0400_0206, 0x0400_0207 => {},
0x0400_0208 => bus.io.ime = value & 1 == 1,
0x0400_0209 => {},
@ -331,7 +331,6 @@ pub const DisplayStatus = extern union {
pub fn set(self: *DisplayStatus, value: u16) void {
const mask: u16 = 0x00C7; // set bits are read-only
self.raw = (self.raw & mask) | (value & ~mask);
}
};
@ -639,4 +638,9 @@ pub const WaitControl = extern union {
prefetch_enable: Bit(u16, 14),
pak_kind: Bit(u16, 15),
raw: u16,
pub fn set(self: *WaitControl, value: u16) void {
const mask: u16 = 0x8000; // set bits are read-only
self.raw = (self.raw & mask) | (value & ~mask);
}
};