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Merge branch 'main' of ssh://musuka.dev:2222/paoda/zba

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-12-30 19:47:24 -06:00
parent 6bf1c44961 94702b9b51
commit 59baa14bde
8 changed files with 116 additions and 115 deletions
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2
README.md
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@ -77,7 +77,7 @@ arm7wrestler GBA Fixed | [destoer](https://github.com/destoer)
## Compiling
Most recently built on Zig [v0.11.0-dev.926+266e2e9a3](https://github.com/ziglang/zig/tree/266e2e9a3)
Most recently built on Zig [v0.11.0-dev.987+a1d82352d](https://github.com/ziglang/zig/tree/a1d82352d)
### Dependencies

2
build.zig
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@ -4,7 +4,7 @@ const Sdk = @import("lib/SDL.zig/Sdk.zig");
pub fn build(b: *std.build.Builder) void {
// Minimum Zig Version
const min_ver = std.SemanticVersion.parse("0.11.0-dev.926+266e2e9a3") catch return; // https://github.com/ziglang/zig/commit/266e2e9a3
const min_ver = std.SemanticVersion.parse("0.11.0-dev.987+a1d82352d") catch return; // https://github.com/ziglang/zig/commit/19056cb68
if (builtin.zig_version.order(min_ver).compare(.lt)) {
std.log.err("{s}", .{b.fmt("Zig v{} does not meet the minimum version requirement. (Zig v{})", .{ builtin.zig_version, min_ver })});
std.os.exit(1);

91
src/core/Bus.zig
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@ -60,9 +60,8 @@ allocator: Allocator,
pub fn init(self: *Self, allocator: Allocator, sched: *Scheduler, cpu: *Arm7tdmi, paths: FilePaths) !void {
const tables = try allocator.alloc(?*anyopaque, 3 * table_len); // Allocate all tables
const read_table: *[table_len]?*const anyopaque = tables[0..table_len];
const left_write: *[table_len]?*anyopaque = tables[table_len .. 2 * table_len];
const right_write: *[table_len]?*anyopaque = tables[2 * table_len .. 3 * table_len];
const read_table = tables[0..table_len];
const write_tables = .{ tables[table_len .. 2 * table_len], tables[2 * table_len .. 3 * table_len] };
self.* = .{
.pak = try GamePak.init(allocator, cpu, paths.rom, paths.save),
@ -78,18 +77,15 @@ pub fn init(self: *Self, allocator: Allocator, sched: *Scheduler, cpu: *Arm7tdmi
.sched = sched,
.read_table = read_table,
.write_tables = .{ left_write, right_write },
.write_tables = write_tables,
.allocator = allocator,
};
// read_table, write_tables, and *Self are not restricted to the lifetime
// of this init function so we can initialize our tables here
fillReadTable(self, read_table);
self.fillReadTable(read_table);
// Internal Display Memory behavious unusually on 8-bit reads
// so we have two different tables depending on whether there's an 8-bit read or not
fillWriteTable(u32, self, left_write);
fillWriteTable(u8, self, right_write);
// Internal Display Memory behaves differently on 8-bit reads
self.fillWriteTable(u32, write_tables[0]);
self.fillWriteTable(u8, write_tables[1]);
}
pub fn deinit(self: *Self) void {
@ -106,50 +102,50 @@ pub fn deinit(self: *Self) void {
self.* = undefined;
}
fn fillReadTable(bus: *Self, table: *[table_len]?*const anyopaque) void {
fn fillReadTable(self: *Self, table: *[table_len]?*const anyopaque) void {
const vramMirror = @import("ppu/Vram.zig").mirror;
for (table) |*ptr, i| {
const addr = page_size * i;
const addr = @intCast(u32, page_size * i);
ptr.* = switch (addr) {
// General Internal Memory
0x0000_0000...0x0000_3FFF => null, // BIOS has it's own checks
0x0200_0000...0x02FF_FFFF => &bus.ewram.buf[addr & 0x3FFFF],
0x0300_0000...0x03FF_FFFF => &bus.iwram.buf[addr & 0x7FFF],
0x0200_0000...0x02FF_FFFF => &self.ewram.buf[addr & 0x3FFFF],
0x0300_0000...0x03FF_FFFF => &self.iwram.buf[addr & 0x7FFF],
0x0400_0000...0x0400_03FF => null, // I/O
// Internal Display Memory
0x0500_0000...0x05FF_FFFF => &bus.ppu.palette.buf[addr & 0x3FF],
0x0600_0000...0x06FF_FFFF => &bus.ppu.vram.buf[vramMirror(addr)],
0x0700_0000...0x07FF_FFFF => &bus.ppu.oam.buf[addr & 0x3FF],
0x0500_0000...0x05FF_FFFF => &self.ppu.palette.buf[addr & 0x3FF],
0x0600_0000...0x06FF_FFFF => &self.ppu.vram.buf[vramMirror(addr)],
0x0700_0000...0x07FF_FFFF => &self.ppu.oam.buf[addr & 0x3FF],
// External Memory (Game Pak)
0x0800_0000...0x0DFF_FFFF => fillTableExternalMemory(bus, addr),
0x0800_0000...0x0DFF_FFFF => self.fillReadTableExternal(addr),
0x0E00_0000...0x0FFF_FFFF => null, // SRAM
else => null,
};
}
}
fn fillWriteTable(comptime T: type, bus: *Self, table: *[table_len]?*const anyopaque) void {
fn fillWriteTable(self: *Self, comptime T: type, table: *[table_len]?*const anyopaque) void {
comptime std.debug.assert(T == u32 or T == u16 or T == u8);
const vramMirror = @import("ppu/Vram.zig").mirror;
for (table) |*ptr, i| {
const addr = page_size * i;
const addr = @intCast(u32, page_size * i);
ptr.* = switch (addr) {
// General Internal Memory
0x0000_0000...0x0000_3FFF => null, // BIOS has it's own checks
0x0200_0000...0x02FF_FFFF => &bus.ewram.buf[addr & 0x3FFFF],
0x0300_0000...0x03FF_FFFF => &bus.iwram.buf[addr & 0x7FFF],
0x0200_0000...0x02FF_FFFF => &self.ewram.buf[addr & 0x3FFFF],
0x0300_0000...0x03FF_FFFF => &self.iwram.buf[addr & 0x7FFF],
0x0400_0000...0x0400_03FF => null, // I/O
// Internal Display Memory
0x0500_0000...0x05FF_FFFF => if (T != u8) &bus.ppu.palette.buf[addr & 0x3FF] else null,
0x0600_0000...0x06FF_FFFF => if (T != u8) &bus.ppu.vram.buf[vramMirror(addr)] else null,
0x0700_0000...0x07FF_FFFF => if (T != u8) &bus.ppu.oam.buf[addr & 0x3FF] else null,
0x0500_0000...0x05FF_FFFF => if (T != u8) &self.ppu.palette.buf[addr & 0x3FF] else null,
0x0600_0000...0x06FF_FFFF => if (T != u8) &self.ppu.vram.buf[vramMirror(addr)] else null,
0x0700_0000...0x07FF_FFFF => if (T != u8) &self.ppu.oam.buf[addr & 0x3FF] else null,
// External Memory (Game Pak)
0x0800_0000...0x0DFF_FFFF => null, // ROM
@ -159,24 +155,29 @@ fn fillWriteTable(comptime T: type, bus: *Self, table: *[table_len]?*const anyop
}
}
fn fillTableExternalMemory(bus: *Self, addr: usize) ?*anyopaque {
fn fillReadTableExternal(self: *Self, addr: u32) ?*anyopaque {
// see `GamePak.zig` for more information about what conditions need to be true
// so that a simple pointer dereference isn't possible
std.debug.assert(addr & @as(u32, page_size - 1) == 0); // addr is guaranteed to be page-aligned
const start_addr = addr;
const end_addr = addr + page_size;
const end_addr = start_addr + page_size;
const gpio_data = start_addr <= 0x0800_00C4 and 0x0800_00C4 < end_addr;
const gpio_direction = start_addr <= 0x0800_00C6 and 0x0800_00C6 < end_addr;
const gpio_control = start_addr <= 0x0800_00C8 and 0x0800_00C8 < end_addr;
{
const data = start_addr <= 0x0800_00C4 and 0x0800_00C4 < end_addr; // GPIO Data
const direction = start_addr <= 0x0800_00C6 and 0x0800_00C6 < end_addr; // GPIO Direction
const control = start_addr <= 0x0800_00C8 and 0x0800_00C8 < end_addr; // GPIO Control
if (bus.pak.gpio.device.kind != .None and (gpio_data or gpio_direction or gpio_control)) {
// We found a GPIO device, and this page a GPIO register. We want to handle this in slowmem
return null;
const has_gpio = data or direction or control;
const gpio_kind = self.pak.gpio.device.kind;
// There is a GPIO Device, and the current page contains at least one memory-mapped GPIO register
if (gpio_kind != .None and has_gpio) return null;
}
if (bus.pak.backup.kind == .Eeprom) {
if (bus.pak.buf.len > 0x100_000) {
if (self.pak.backup.kind == .Eeprom) {
if (self.pak.buf.len > 0x100_000) {
// We are using a "large" EEPROM which means that if the below check is true
// this page has an address that's reserved for the EEPROM and therefore must
// be handled in slowmem
@ -192,9 +193,9 @@ fn fillTableExternalMemory(bus: *Self, addr: usize) ?*anyopaque {
// Finally, the GamePak has some unique behaviour for reads past the end of the ROM,
// so those will be handled by slowmem as well
const masked_addr = addr & 0x1FF_FFFF;
if (masked_addr >= bus.pak.buf.len) return null;
if (masked_addr >= self.pak.buf.len) return null;
return &bus.pak.buf[masked_addr];
return &self.pak.buf[masked_addr];
}
pub fn dbgRead(self: *const Self, comptime T: type, unaligned_address: u32) T {
@ -208,8 +209,7 @@ pub fn dbgRead(self: *const Self, comptime T: type, unaligned_address: u32) T {
if (self.read_table[page]) |some_ptr| {
// We have a pointer to a page, cast the pointer to it's underlying type
const Ptr = [*]const T;
const alignment = @alignOf(std.meta.Child(Ptr));
const ptr = @ptrCast(Ptr, @alignCast(alignment, some_ptr));
const ptr = @ptrCast(Ptr, @alignCast(@alignOf(std.meta.Child(Ptr)), some_ptr));
// Note: We don't check array length, since we force align the
// lower bits of the address as the GBA would
@ -326,8 +326,7 @@ pub fn read(self: *Self, comptime T: type, unaligned_address: u32) T {
if (self.read_table[page]) |some_ptr| {
// We have a pointer to a page, cast the pointer to it's underlying type
const Ptr = [*]const T;
const alignment = @alignOf(std.meta.Child(Ptr));
const ptr = @ptrCast(Ptr, @alignCast(alignment, some_ptr));
const ptr = @ptrCast(Ptr, @alignCast(@alignOf(std.meta.Child(Ptr)), some_ptr));
// Note: We don't check array length, since we force align the
// lower bits of the address as the GBA would
@ -394,8 +393,7 @@ pub fn write(self: *Self, comptime T: type, unaligned_address: u32, value: T) vo
if (self.write_tables[@boolToInt(T == u8)][page]) |some_ptr| {
// We have a pointer to a page, cast the pointer to it's underlying type
const Ptr = [*]T;
const alignment = @alignOf(std.meta.Child(Ptr));
const ptr = @ptrCast(Ptr, @alignCast(alignment, some_ptr));
const ptr = @ptrCast(Ptr, @alignCast(@alignOf(std.meta.Child(Ptr)), some_ptr));
// Note: We don't check array length, since we force align the
// lower bits of the address as the GBA would
@ -408,8 +406,9 @@ pub fn write(self: *Self, comptime T: type, unaligned_address: u32, value: T) vo
}
}
pub fn slowWrite(self: *Self, comptime T: type, unaligned_address: u32, value: T) void {
// @setCold(true);
fn slowWrite(self: *Self, comptime T: type, unaligned_address: u32, value: T) void {
@setCold(true);
const page = @truncate(u8, unaligned_address >> 24);
const address = forceAlign(T, unaligned_address);

30
src/core/cpu/arm/data_processing.zig
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@ -24,7 +24,7 @@ pub fn dataProcessing(comptime I: bool, comptime S: bool, comptime kind: u4) Ins
if (!I and opcode >> 4 & 1 == 1) cpu.r[15] -= 4;
var result: u32 = undefined;
var overflow: bool = undefined;
var overflow: u1 = undefined;
// Perform Data Processing Logic
switch (kind) {
@ -62,7 +62,9 @@ pub fn dataProcessing(comptime I: bool, comptime S: bool, comptime kind: u4) Ins
if (rd == 0xF)
return undefinedTestBehaviour(cpu);
overflow = @addWithOverflow(u32, op1, op2, &result);
const tmp = @addWithOverflow(op1, op2);
result = tmp[0];
overflow = tmp[1];
},
0xC => result = op1 | op2, // ORR
0xD => result = op2, // MOV
@ -110,7 +112,7 @@ pub fn dataProcessing(comptime I: bool, comptime S: bool, comptime kind: u4) Ins
// ADD, ADC Flags
cpu.cpsr.n.write(result >> 31 & 1 == 1);
cpu.cpsr.z.write(result == 0);
cpu.cpsr.c.write(overflow);
cpu.cpsr.c.write(overflow == 0b1);
cpu.cpsr.v.write(((op1 ^ result) & (op2 ^ result)) >> 31 & 1 == 1);
},
0x6, 0x7 => if (S and rd != 0xF) {
@ -141,7 +143,7 @@ pub fn dataProcessing(comptime I: bool, comptime S: bool, comptime kind: u4) Ins
cpu.cpsr.v.write(((op1 ^ result) & (~op2 ^ result)) >> 31 & 1 == 1);
} else if (kind == 0xB) {
// CMN specific
cpu.cpsr.c.write(overflow);
cpu.cpsr.c.write(overflow == 0b1);
cpu.cpsr.v.write(((op1 ^ result) & (op2 ^ result)) >> 31 & 1 == 1);
} else {
// TST, TEQ specific
@ -162,19 +164,19 @@ pub fn sbc(left: u32, right: u32, old_carry: u1) u32 {
return ret;
}
pub fn add(overflow: *bool, left: u32, right: u32) u32 {
var ret: u32 = undefined;
overflow.* = @addWithOverflow(u32, left, right, &ret);
return ret;
pub fn add(overflow: *u1, left: u32, right: u32) u32 {
const ret = @addWithOverflow(left, right);
overflow.* = ret[1];
return ret[0];
}
pub fn adc(overflow: *bool, left: u32, right: u32, old_carry: u1) u32 {
var ret: u32 = undefined;
const first = @addWithOverflow(u32, left, right, &ret);
const second = @addWithOverflow(u32, ret, old_carry, &ret);
pub fn adc(overflow: *u1, left: u32, right: u32, old_carry: u1) u32 {
const tmp = @addWithOverflow(left, right);
const ret = @addWithOverflow(tmp[0], old_carry);
overflow.* = tmp[1] | ret[1];
overflow.* = first or second;
return ret;
return ret[0];
}
fn undefinedTestBehaviour(cpu: *Arm7tdmi) void {

12
src/core/cpu/thumb/alu.zig
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@ -21,7 +21,8 @@ pub fn fmt4(comptime op: u4) InstrFn {
const op2 = cpu.r[rs];
var result: u32 = undefined;
var overflow: bool = undefined;
var overflow: u1 = undefined;
switch (op) {
0x0 => result = op1 & op2, // AND
0x1 => result = op1 ^ op2, // EOR
@ -34,7 +35,12 @@ pub fn fmt4(comptime op: u4) InstrFn {
0x8 => result = op1 & op2, // TST
0x9 => result = 0 -% op2, // NEG
0xA => result = op1 -% op2, // CMP
0xB => overflow = @addWithOverflow(u32, op1, op2, &result), // CMN
0xB => {
// CMN
const tmp = @addWithOverflow(op1, op2);
result = tmp[0];
overflow = tmp[1];
},
0xC => result = op1 | op2, // ORR
0xD => result = @truncate(u32, @as(u64, op2) * @as(u64, op1)),
0xE => result = op1 & ~op2,
@ -71,7 +77,7 @@ pub fn fmt4(comptime op: u4) InstrFn {
// ADC, CMN
cpu.cpsr.n.write(result >> 31 & 1 == 1);
cpu.cpsr.z.write(result == 0);
cpu.cpsr.c.write(overflow);
cpu.cpsr.c.write(overflow == 0b1);
cpu.cpsr.v.write(((op1 ^ result) & (op2 ^ result)) >> 31 & 1 == 1);
},
0x6 => {

10
src/core/cpu/thumb/data_processing.zig
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@ -64,7 +64,7 @@ pub fn fmt5(comptime op: u2, comptime h1: u1, comptime h2: u1) InstrFn {
const op2 = cpu.r[rs];
var result: u32 = undefined;
var overflow: bool = undefined;
var overflow: u1 = undefined;
switch (op) {
0b00 => result = add(&overflow, op1, op2), // ADD
0b01 => result = op1 -% op2, // CMP
@ -126,13 +126,13 @@ pub fn fmt2(comptime I: bool, is_sub: bool, rn: u3) InstrFn {
cpu.cpsr.v.write(((op1 ^ result) & (~op2 ^ result)) >> 31 & 1 == 1);
} else {
// ADD
var overflow: bool = undefined;
var overflow: u1 = undefined;
const result = add(&overflow, op1, op2);
cpu.r[rd] = result;
cpu.cpsr.n.write(result >> 31 & 1 == 1);
cpu.cpsr.z.write(result == 0);
cpu.cpsr.c.write(overflow);
cpu.cpsr.c.write(overflow == 0b1);
cpu.cpsr.v.write(((op1 ^ result) & (op2 ^ result)) >> 31 & 1 == 1);
}
}
@ -145,7 +145,7 @@ pub fn fmt3(comptime op: u2, comptime rd: u3) InstrFn {
const op1 = cpu.r[rd];
const op2: u32 = opcode & 0xFF; // Offset
var overflow: bool = undefined;
var overflow: u1 = undefined;
const result: u32 = switch (op) {
0b00 => op2, // MOV
0b01 => op1 -% op2, // CMP
@ -169,7 +169,7 @@ pub fn fmt3(comptime op: u2, comptime rd: u3) InstrFn {
},
0b10 => {
// ADD
cpu.cpsr.c.write(overflow);
cpu.cpsr.c.write(overflow == 0b1);
cpu.cpsr.v.write(((op1 ^ result) & (op2 ^ result)) >> 31 & 1 == 1);
},
}

2
src/core/emu.zig
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@ -94,7 +94,7 @@ pub fn runFrame(sched: *Scheduler, cpu: *Arm7tdmi) void {
if (!cpu.stepDmaTransfer()) {
if (cpu.isHalted()) {
// Fast-forward to next Event
sched.tick = sched.queue.peek().?.tick;
sched.tick = sched.nextTimestamp();
} else {
cpu.step();
}

82
src/core/scheduler.zig
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@ -31,61 +31,55 @@ pub const Scheduler = struct {
}
pub fn handleEvent(self: *Self, cpu: *Arm7tdmi) void {
if (self.queue.removeOrNull()) |event| {
const late = self.tick - event.tick;
const event = self.queue.remove();
const late = self.tick - event.tick;
switch (event.kind) {
.HeatDeath => {
log.err("u64 overflow. This *actually* should never happen.", .{});
unreachable;
},
.Draw => {
// The end of a VDraw
cpu.bus.ppu.drawScanline();
cpu.bus.ppu.onHdrawEnd(cpu, late);
},
.TimerOverflow => |id| {
switch (id) {
inline 0...3 => |idx| cpu.bus.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),
}
},
.RealTimeClock => {
const device = &cpu.bus.pak.gpio.device;
if (device.kind != .Rtc or device.ptr == null) return;
switch (event.kind) {
.HeatDeath => {
log.err("u64 overflow. This *actually* should never happen.", .{});
unreachable;
},
.Draw => {
// The end of a VDraw
cpu.bus.ppu.drawScanline();
cpu.bus.ppu.onHdrawEnd(cpu, late);
},
.TimerOverflow => |id| {
switch (id) {
inline 0...3 => |idx| cpu.bus.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),
}
},
.RealTimeClock => {
const device = &cpu.bus.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
}
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
}
}
/// Removes the **first** scheduled event of type `needle`
pub fn removeScheduledEvent(self: *Self, needle: EventKind) void {
var it = self.queue.iterator();
var i: usize = 0;
while (it.next()) |event| : (i += 1) {
for (self.queue.items) |event, i| {
if (std.meta.eql(event.kind, needle)) {
// This invalidates the iterator
// invalidates the slice we're iterating over
_ = self.queue.removeIndex(i);
// Since removing something from the PQ invalidates the iterator,
// this implementation can safely only remove the first instance of
// a Scheduled Event. Exit Early
log.debug("Removed {?}@{}", .{ event.kind, event.tick });
break;
}
}