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chore: conform to zig style guides

This commit is contained in:
Rekai Nyangadzayi Musuka 2022-01-01 21:08:36 -06:00
parent f2cc0721c7
commit c40a1af534
9 changed files with 95 additions and 102 deletions
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23
src/bus.zig
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@ -1,6 +1,6 @@
const std = @import("std");
const GamePak = @import("pak.zig").GamePak;
const GamePak = @import("pak.zig").GamePak;
const Allocator = std.mem.Allocator;
pub const Bus = struct {
@ -17,11 +17,8 @@ pub const Bus = struct {
}
pub fn writeWord(self: *@This(), addr: u32, word: u32) void {
// TODO: Actually implement the memory mmap
if (addr >= self.pak.buf.len) {
return;
}
// TODO: Actually implement the memory map
if (addr > self.pak.buf.len) return;
self.pak.writeWord(addr, word);
}
@ -30,12 +27,8 @@ pub const Bus = struct {
}
pub fn writeHalfWord(self: *@This(), addr: u32, halfword: u16) void {
// TODO: Actually implement the memory mmap
if (addr >= self.pak.buf.len) {
return;
}
// TODO: Actually implement the memory map
if (addr > self.pak.buf.len) return;
self.pak.writeHalfWord(addr, halfword);
}
@ -43,7 +36,9 @@ pub const Bus = struct {
return self.pak.readByte(addr);
}
pub fn writeByte(_: *@This(), _: u32, _: u8) void {
std.debug.panic("TODO: Implement Bus#writeByte", .{});
pub fn writeByte(self: *@This(), addr: u32, byte: u8) void {
// TODO: Actually implement the memory map
if (addr > self.pak.buf.len) return;
self.pak.writeByte(addr, byte);
}
};

99
src/cpu.zig
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@ -7,10 +7,10 @@ const comptimeDataProcessing = @import("cpu/data_processing.zig").comptimeDataPr
const comptimeSingleDataTransfer = @import("cpu/single_data_transfer.zig").comptimeSingleDataTransfer;
const comptimeHalfSignedDataTransfer = @import("cpu/half_signed_data_transfer.zig").comptimeHalfSignedDataTransfer;
pub const InstrFn = fn (*ARM7TDMI, *Bus, u32) void;
const ARM_LUT: [0x1000]InstrFn = populate();
pub const InstrFn = fn (*Arm7tdmi, *Bus, u32) void;
const arm_lut: [0x1000]InstrFn = populate();
pub const ARM7TDMI = struct {
pub const Arm7tdmi = struct {
r: [16]u32,
sch: *Scheduler,
bus: *Bus,
@ -27,11 +27,9 @@ pub const ARM7TDMI = struct {
pub inline fn step(self: *@This()) u64 {
const opcode = self.fetch();
std.debug.print("opcode: 0x{X:}\n", .{opcode}); // Debug
std.debug.print("R15: 0x{X:}\n", .{opcode}); // Debug
ARM_LUT[armIdx(opcode)](self, self.bus, opcode);
arm_lut[armIdx(opcode)](self, self.bus, opcode);
return 1;
}
@ -52,43 +50,42 @@ fn armIdx(opcode: u32) u12 {
fn populate() [0x1000]InstrFn {
return comptime {
@setEvalBranchQuota(0x5000);
var lut = [_]InstrFn{undefined_instr} ** 0x1000;
@setEvalBranchQuota(0x5000); // TODO: Figure out exact size
var lut = [_]InstrFn{undefinedInstruction} ** 0x1000;
var i: usize = 0;
while (i < lut.len) : (i += 1) {
if (i >> 10 & 0x3 == 0b00) {
const I = i >> 9 & 0x01 == 0x01;
const S = i >> 4 & 0x01 == 0x01;
const instrKind = i >> 5 & 0x0F;
const I = i >> 9 & 1 == 1;
const S = i >> 4 & 1 == 1;
const instrKind = i >> 5 & 0xF;
lut[i] = comptimeDataProcessing(I, S, instrKind);
}
if (i >> 9 & 0x7 == 0b000 and i >> 3 & 0x01 == 0x01 and i & 0x01 == 0x01) {
// Halfword and Signed Data Transfer with register offset
const P = i >> 8 & 0x01 == 0x01;
const U = i >> 7 & 0x01 == 0x01;
const I = i >> 6 & 0x01 == 0x01;
const W = i >> 5 & 0x01 == 0x01;
const L = i >> 4 & 0x01 == 0x01;
if (i >> 9 & 0x7 == 0b000 and i >> 3 & 1 == 1 and i & 1 == 1) {
const P = i >> 8 & 1 == 1;
const U = i >> 7 & 1 == 1;
const I = i >> 6 & 1 == 1;
const W = i >> 5 & 1 == 1;
const L = i >> 4 & 1 == 1;
lut[i] = comptimeHalfSignedDataTransfer(P, U, I, W, L);
}
if (i >> 10 & 0x3 == 0b01) {
const I = i >> 9 & 0x01 == 0x01;
const P = i >> 8 & 0x01 == 0x01;
const U = i >> 7 & 0x01 == 0x01;
const B = i >> 6 & 0x01 == 0x01;
const W = i >> 5 & 0x01 == 0x01;
const L = i >> 4 & 0x01 == 0x01;
const I = i >> 9 & 1 == 1;
const P = i >> 8 & 1 == 1;
const U = i >> 7 & 1 == 1;
const B = i >> 6 & 1 == 1;
const W = i >> 5 & 1 == 1;
const L = i >> 4 & 1 == 1;
lut[i] = comptimeSingleDataTransfer(I, P, U, B, W, L);
}
if (i >> 9 & 0x7 == 0b101) {
const L = i >> 8 & 0x01 == 0x01;
const L = i >> 8 & 1 == 1;
lut[i] = comptimeBranch(L);
}
}
@ -101,70 +98,70 @@ const CPSR = struct {
inner: u32,
pub fn n(self: *const @This()) bool {
return self.inner >> 31 & 0x01 == 0x01;
return self.inner >> 31 & 1 == 1;
}
pub fn set_n(self: *@This(), set: bool) void {
self.set_bit(31, set);
pub fn setN(self: *@This(), set: bool) void {
self.setBit(31, set);
}
pub fn z(self: *const @This()) bool {
return self.inner >> 30 & 0x01 == 0x01;
return self.inner >> 30 & 1 == 1;
}
pub fn set_z(self: *@This(), set: bool) void {
self.set_bit(30, set);
pub fn setZ(self: *@This(), set: bool) void {
self.setBit(30, set);
}
pub fn c(self: *const @This()) bool {
return self.inner >> 29 & 0x01 == 0x01;
return self.inner >> 29 & 1 == 1;
}
pub fn set_c(self: *@This(), set: bool) void {
self.set_bit(29, set);
pub fn setC(self: *@This(), set: bool) void {
self.setBit(29, set);
}
pub fn v(self: *const @This()) bool {
return self.inner >> 28 & 0x01 == 0x01;
return self.inner >> 28 & 1 == 1;
}
pub fn set_v(self: *@This(), set: bool) void {
self.set_bit(28, set);
pub fn setV(self: *@This(), set: bool) void {
self.setBit(28, set);
}
pub fn i(self: *const @This()) bool {
return self.inner >> 7 & 0x01 == 0x01;
return self.inner >> 7 & 1 == 1;
}
pub fn set_i(self: *@This(), set: bool) void {
self.set_bit(7, set);
pub fn setI(self: *@This(), set: bool) void {
self.setBit(7, set);
}
pub fn f(self: *const @This()) bool {
return self.inner >> 6 & 0x01 == 0x01;
return self.inner >> 6 & 1 == 1;
}
pub fn set_f(self: *@This(), set: bool) void {
self.set_bit(6, set);
pub fn setF(self: *@This(), set: bool) void {
self.setBit(6, set);
}
pub fn t(self: *const @This()) bool {
return self.inner >> 5 & 0x01 == 0x01;
return self.inner >> 5 & 1 == 1;
}
pub fn set_t(self: *@This(), set: bool) void {
self.set_bit(5, set);
pub fn setT(self: *@This(), set: bool) void {
self.setBit(5, set);
}
pub fn mode(self: *const @This()) Mode {
return self.inner & 0x1F;
}
pub fn set_mode(_: *@This(), _: Mode) void {
pub fn setMode(_: *@This(), _: Mode) void {
std.debug.panic("TODO: Implement set_mode for CPSR", .{});
}
fn set_bit(self: *@This(), comptime bit: usize, set: bool) void {
fn setBit(self: *@This(), comptime bit: usize, set: bool) void {
const set_val = @as(u32, @boolToInt(set)) << bit;
const mask = ~(@as(u32, 1) << bit);
@ -182,14 +179,14 @@ const Mode = enum(u5) {
System = 0b11111,
};
fn undefined_instr(_: *ARM7TDMI, _: *Bus, opcode: u32) void {
fn undefinedInstruction(_: *Arm7tdmi, _: *Bus, opcode: u32) void {
const id = armIdx(opcode);
std.debug.panic("[0x{X:}] 0x{X:} is an illegal opcode", .{ id, opcode });
}
fn comptimeBranch(comptime L: bool) InstrFn {
return struct {
fn branch(cpu: *ARM7TDMI, _: *Bus, opcode: u32) void {
fn branch(cpu: *Arm7tdmi, _: *Bus, opcode: u32) void {
if (L) {
cpu.r[14] = cpu.r[15] - 4;
}

29
src/cpu/data_processing.zig
View File

@ -1,13 +1,13 @@
const std = @import("std");
const cpu_mod = @import("../cpu.zig");
const processor = @import("../cpu.zig");
const Bus = @import("../bus.zig").Bus;
const ARM7TDMI = cpu_mod.ARM7TDMI;
const InstrFn = cpu_mod.InstrFn;
const Arm7tdmi = processor.Arm7tdmi;
const InstrFn = processor.InstrFn;
pub fn comptimeDataProcessing(comptime I: bool, comptime S: bool, comptime instrKind: u4) InstrFn {
return struct {
fn dataProcessing(cpu: *ARM7TDMI, _: *Bus, opcode: u32) void {
fn dataProcessing(cpu: *Arm7tdmi, _: *Bus, opcode: u32) void {
const rd = opcode >> 12 & 0xF;
const op1 = opcode >> 16 & 0xF;
@ -15,7 +15,7 @@ pub fn comptimeDataProcessing(comptime I: bool, comptime S: bool, comptime instr
if (I) {
op2 = std.math.rotr(u32, opcode & 0xFF, (opcode >> 8 & 0xF) << 1);
} else {
op2 = reg_op2(cpu, opcode);
op2 = registerOp2(cpu, opcode);
}
switch (instrKind) {
@ -34,17 +34,16 @@ pub fn comptimeDataProcessing(comptime I: bool, comptime S: bool, comptime instr
0xA => {
// CMP
var result: u32 = undefined;
const op1_val = cpu.r[op1];
const op1_val = cpu.r[op1];
const v_ctx = (op1_val >> 31 == 0x01) or (op2 >> 31 == 0x01);
const didOverflow = @subWithOverflow(u32, op1_val, op2, &result);
cpu.cpsr.set_v(v_ctx and (result >> 31 & 0x01 == 0x01));
cpu.cpsr.set_c(didOverflow);
cpu.cpsr.set_z(result == 0x00);
cpu.cpsr.set_n(result >> 31 & 0x01 == 0x01);
cpu.cpsr.setV(v_ctx and (result >> 31 & 0x01 == 0x01));
cpu.cpsr.setC(didOverflow);
cpu.cpsr.setZ(result == 0x00);
cpu.cpsr.setN(result >> 31 & 0x01 == 0x01);
},
else => std.debug.panic("TODO: implement data processing type {}", .{instrKind}),
}
@ -52,7 +51,7 @@ pub fn comptimeDataProcessing(comptime I: bool, comptime S: bool, comptime instr
}.dataProcessing;
}
fn reg_op2(cpu: *const ARM7TDMI, opcode: u32) u32 {
fn registerOp2(cpu: *const Arm7tdmi, opcode: u32) u32 {
var amount: u32 = undefined;
if (opcode >> 4 & 0x01 == 0x01) {
amount = cpu.r[opcode >> 8 & 0xF] & 0xFF;

8
src/cpu/half_signed_data_transfer.zig
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@ -1,14 +1,14 @@
const std = @import("std");
const cpu_mod = @import("../cpu.zig");
const processor = @import("../cpu.zig");
const util = @import("../util.zig");
const Bus = @import("../bus.zig").Bus;
const ARM7TDMI = cpu_mod.ARM7TDMI;
const InstrFn = cpu_mod.InstrFn;
const Arm7tdmi = processor.Arm7tdmi;
const InstrFn = processor.InstrFn;
pub fn comptimeHalfSignedDataTransfer(comptime P: bool, comptime U: bool, comptime I: bool, comptime W: bool, comptime L: bool) InstrFn {
return struct {
fn halfSignedDataTransfer(cpu: *ARM7TDMI, bus: *Bus, opcode: u32) void {
fn halfSignedDataTransfer(cpu: *Arm7tdmi, bus: *Bus, opcode: u32) void {
const rn = opcode >> 16 & 0xF;
const rd = opcode >> 12 & 0xF;
const rm = opcode & 0xF;

10
src/cpu/single_data_transfer.zig
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@ -1,14 +1,14 @@
const std = @import("std");
const util = @import("../util.zig");
const mod_cpu = @import("../cpu.zig");
const processor = @import("../cpu.zig");
const ARM7TDMI = mod_cpu.ARM7TDMI;
const InstrFn = mod_cpu.InstrFn;
const Bus = @import("../bus.zig").Bus;
const Arm7tdmi = processor.Arm7tdmi;
const InstrFn = processor.InstrFn;
pub fn comptimeSingleDataTransfer(comptime I: bool, comptime P: bool, comptime U: bool, comptime B: bool, comptime W: bool, comptime L: bool) InstrFn {
return struct {
fn singleDataTransfer(cpu: *ARM7TDMI, bus: *Bus, opcode: u32) void {
fn singleDataTransfer(cpu: *Arm7tdmi, bus: *Bus, opcode: u32) void {
const rn = opcode >> 16 & 0xF;
const rd = opcode >> 12 & 0xF;
@ -55,7 +55,7 @@ pub fn comptimeSingleDataTransfer(comptime I: bool, comptime P: bool, comptime U
}.singleDataTransfer;
}
fn registerOffset(cpu: *ARM7TDMI, opcode: u32) u32 {
fn registerOffset(cpu: *Arm7tdmi, opcode: u32) u32 {
const amount = opcode >> 7 & 0x1F;
const rm = opcode & 0xF;
const r_val = cpu.r[rm];

8
src/emu.zig
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@ -1,13 +1,13 @@
const _ = @import("std");
const Scheduler = @import("scheduler.zig").Scheduler;
const ARM7TDMI = @import("cpu.zig").ARM7TDMI;
const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
const Bus = @import("bus.zig").Bus;
const CYCLES_PER_FRAME: u64 = 10_000; // TODO: What is this?
const cycles_per_frame: u64 = 10_000; // TODO: How many cycles actually?
pub fn runFrame(sch: *Scheduler, cpu: *ARM7TDMI, bus: *Bus) void {
const frame_end = sch.tick + CYCLES_PER_FRAME;
pub fn runFrame(sch: *Scheduler, cpu: *Arm7tdmi, bus: *Bus) void {
const frame_end = sch.tick + cycles_per_frame;
while (sch.tick < frame_end) {
while (sch.tick < sch.nextTimestamp()) {

7
src/main.zig
View File

@ -1,10 +1,9 @@
const std = @import("std");
const emu = @import("emu.zig");
const Scheduler = @import("scheduler.zig").Scheduler;
const Bus = @import("bus.zig").Bus;
const ARM7TDMI = @import("cpu.zig").ARM7TDMI;
const emu = @import("emu.zig");
const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
pub fn main() anyerror!void {
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
@ -13,7 +12,7 @@ pub fn main() anyerror!void {
var bus = try Bus.withPak(alloc, "./bin/demo/beeg/beeg.gba");
var scheduler = Scheduler.new(alloc);
var cpu = ARM7TDMI.new(&scheduler, &bus);
var cpu = Arm7tdmi.new(&scheduler, &bus);
while (true) {
emu.runFrame(&scheduler, &cpu, &bus);

4
src/pak.zig
View File

@ -39,4 +39,8 @@ pub const GamePak = struct {
pub fn readByte(self: *const @This(), addr: u32) u8 {
return self.buf[addr];
}
pub fn writeByte(self: *@This(), addr: u32, byte: u8) void {
self.buf[addr] = byte;
}
};

9
src/scheduler.zig
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@ -1,7 +1,7 @@
const std = @import("std");
const ARM7TDMI = @import("cpu.zig").ARM7TDMI;
const Bus = @import("bus.zig").Bus;
const Bus = @import("bus.zig").Bus;
const Arm7tdmi = @import("cpu.zig").Arm7tdmi;
const Order = std.math.Order;
const PriorityQueue = std.PriorityQueue;
const Allocator = std.mem.Allocator;
@ -21,7 +21,7 @@ pub const Scheduler = struct {
return scheduler;
}
pub fn handleEvent(self: *@This(), _: *ARM7TDMI, _: *Bus) void {
pub fn handleEvent(self: *@This(), _: *Arm7tdmi, _: *Bus) void {
const should_handle = if (self.queue.peek()) |e| self.tick >= e.tick else false;
if (should_handle) {
@ -47,8 +47,7 @@ pub const Event = struct {
tick: u64,
};
fn lessThan(context: void, a: Event, b: Event) Order {
_ = context;
fn lessThan(_: void, a: Event, b: Event) Order {
return std.math.order(a.tick, b.tick);
}