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chore: move cpu implementation to it's own module

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There's a decent amount of Hacks and TODO:s that need revisiting
I should spend a bit of time cleaning up code 😔
This commit is contained in:
Rekai Nyangadzayi Musuka
2023-06-25 18:56:37 -05:00
parent 5b6650ef34
commit 954fb279ad
33 changed files with 208 additions and 2129 deletions
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29
src/core/scheduler.zig
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@@ -1,6 +1,7 @@
const std = @import("std");
const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
const Arm7tdmi = @import("arm32").Arm7tdmi;
const Bus = @import("Bus.zig");
const Clock = @import("bus/gpio.zig").Clock;
const Order = std.math.Order;
@@ -45,6 +46,8 @@ pub const Scheduler = struct {
const event = self.queue.remove();
const late = self.tick - event.tick;
const bus_ptr = @ptrCast(*Bus, @alignCast(@alignOf(Bus), cpu.bus.ptr));
switch (event.kind) {
.HeatDeath => {
log.err("u64 overflow. This *actually* should never happen.", .{});
@@ -52,33 +55,33 @@ pub const Scheduler = struct {
},
.Draw => {
// The end of a VDraw
cpu.bus.ppu.drawScanline();
cpu.bus.ppu.onHdrawEnd(cpu, late);
bus_ptr.ppu.drawScanline();
bus_ptr.ppu.onHdrawEnd(cpu, late);
},
.TimerOverflow => |id| {
switch (id) {
inline 0...3 => |idx| cpu.bus.tim[idx].onTimerExpire(cpu, late),
inline 0...3 => |idx| bus_ptr.tim[idx].onTimerExpire(cpu, late),
}
},
.ApuChannel => |id| {
switch (id) {
0 => cpu.bus.apu.ch1.onToneSweepEvent(late),
1 => cpu.bus.apu.ch2.onToneEvent(late),
2 => cpu.bus.apu.ch3.onWaveEvent(late),
3 => cpu.bus.apu.ch4.onNoiseEvent(late),
0 => bus_ptr.apu.ch1.onToneSweepEvent(late),
1 => bus_ptr.apu.ch2.onToneEvent(late),
2 => bus_ptr.apu.ch3.onWaveEvent(late),
3 => bus_ptr.apu.ch4.onNoiseEvent(late),
}
},
.RealTimeClock => {
const device = &cpu.bus.pak.gpio.device;
const device = &bus_ptr.pak.gpio.device;
if (device.kind != .Rtc or device.ptr == null) return;
const clock = @ptrCast(*Clock, @alignCast(@alignOf(*Clock), device.ptr.?));
clock.onClockUpdate(late);
},
.FrameSequencer => cpu.bus.apu.onSequencerTick(late),
.SampleAudio => cpu.bus.apu.sampleAudio(late),
.HBlank => cpu.bus.ppu.onHblankEnd(cpu, late), // The end of a HBlank
.VBlank => cpu.bus.ppu.onHdrawEnd(cpu, late), // The end of a VBlank
.FrameSequencer => bus_ptr.apu.onSequencerTick(late),
.SampleAudio => bus_ptr.apu.sampleAudio(late),
.HBlank => bus_ptr.ppu.onHblankEnd(cpu, late), // The end of a HBlank
.VBlank => bus_ptr.ppu.onHdrawEnd(cpu, late), // The end of a VBlank
}
}