diff --git a/src/bus.zig b/src/bus.zig index 71d6660..c486c77 100644 --- a/src/bus.zig +++ b/src/bus.zig @@ -1,5 +1,6 @@ const std = @import("std"); +const Io = @import("bus/io.zig").Io; const Bios = @import("bus/bios.zig").Bios; const GamePak = @import("bus/pak.zig").GamePak; const Allocator = std.mem.Allocator; @@ -7,12 +8,14 @@ const Allocator = std.mem.Allocator; pub const Bus = struct { pak: GamePak, bios: Bios, + io: Io, pub fn init(alloc: Allocator, path: []const u8) !@This() { return @This(){ .pak = try GamePak.init(alloc, path), // TODO: don't hardcode this + bundle open-sorce Boot ROM .bios = try Bios.init(alloc, "./bin/gba_bios.bin"), + .io = Io.init(), }; } @@ -20,14 +23,14 @@ pub const Bus = struct { return switch (addr) { // General Internal Memory 0x0000_0000...0x0000_3FFF => self.bios.get32(@as(usize, addr)), - 0x0200_0000...0x0203FFFF => std.debug.panic("read32 from 0x{X:} in IWRAM", .{addr}), - 0x0300_0000...0x0300_7FFF => std.debug.panic("read32 from 0x{X:} in EWRAM", .{addr}), - 0x0400_0000...0x0400_03FE => std.debug.panic("read32 from 0x{X:} in I/O", .{addr}), + 0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:32] read from 0x{X:} in IWRAM", .{addr}), + 0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:32] read from 0x{X:} in EWRAM", .{addr}), + 0x0400_0000...0x0400_03FE => self.read32(addr), // Internal Display Memory - 0x0500_0000...0x0500_03FF => std.debug.panic("read32 from 0x{X:} in BG/OBJ Palette RAM", .{addr}), - 0x0600_0000...0x0601_7FFF => std.debug.panic("read32 from 0x{X:} in VRAM", .{addr}), - 0x0700_0000...0x0700_03FF => std.debug.panic("read32 from 0x{X:} in OAM", .{addr}), + 0x0500_0000...0x0500_03FF => std.debug.panic("[Bus:32] read from 0x{X:} in BG/OBJ Palette RAM", .{addr}), + 0x0600_0000...0x0601_7FFF => std.debug.panic("[Bus:32] read from 0x{X:} in VRAM", .{addr}), + 0x0700_0000...0x0700_03FF => std.debug.panic("[Bus:32] read from 0x{X:} in OAM", .{addr}), // External Memory (Game Pak) 0x0800_0000...0x09FF_FFFF => self.pak.get32(@as(usize, addr - 0x0800_0000)), @@ -35,7 +38,7 @@ pub const Bus = struct { 0x0C00_0000...0x0DFF_FFFF => self.pak.get32(@as(usize, addr - 0x0C00_0000)), else => { - std.log.warn("ZBA tried to read32 from 0x{X:}", .{addr}); + std.log.warn("[Bus:32] ZBA tried to read from 0x{X:}", .{addr}); return 0x0000_0000; }, }; @@ -46,16 +49,16 @@ pub const Bus = struct { switch (addr) { // General Internal Memory - 0x0200_0000...0x0203FFFF => std.debug.panic("write32 0x{X:} to 0x{X:} in IWRAM", .{ word, addr }), - 0x0300_0000...0x0300_7FFF => std.debug.panic("write32 0x{X:} to 0x{X:} in EWRAM", .{ word, addr }), - 0x0400_0000...0x0400_03FE => std.debug.panic("write32 0x{X:} to 0x{X:} in I/O", .{ word, addr }), + 0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in IWRAM", .{ word, addr }), + 0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in EWRAM", .{ word, addr }), + 0x0400_0000...0x0400_03FE => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in I/O", .{ word, addr }), // Internal Display Memory - 0x0500_0000...0x0500_03FF => std.debug.panic("write32 0x{X:} to 0x{X:} in BG/OBJ Palette RAM", .{ word, addr }), - 0x0600_0000...0x0601_7FFF => std.debug.panic("write32 0x{X:} to 0x{X:} in VRAM", .{ word, addr }), - 0x0700_0000...0x0700_03FF => std.debug.panic("write32 0x{X:} to 0x{X:} in OAM", .{ word, addr }), + 0x0500_0000...0x0500_03FF => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in BG/OBJ Palette RAM", .{ word, addr }), + 0x0600_0000...0x0601_7FFF => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in VRAM", .{ word, addr }), + 0x0700_0000...0x0700_03FF => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in OAM", .{ word, addr }), - else => std.log.warn("ZBA tried to write32 0x{X:} to 0x{X:}", .{ word, addr }), + else => std.log.warn("[Bus:32] ZBA tried to write 0x{X:} to 0x{X:}", .{ word, addr }), } } @@ -63,14 +66,14 @@ pub const Bus = struct { return switch (addr) { // General Internal Memory 0x0000_0000...0x0000_3FFF => self.bios.get16(@as(usize, addr)), - 0x0200_0000...0x0203FFFF => std.debug.panic("read16 from 0x{X:} in IWRAM", .{addr}), - 0x0300_0000...0x0300_7FFF => std.debug.panic("read16 from 0x{X:} in EWRAM", .{addr}), - 0x0400_0000...0x0400_03FE => std.debug.panic("read16 from 0x{X:} in I/O", .{addr}), + 0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:16] read from 0x{X:} in IWRAM", .{addr}), + 0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:16] read from 0x{X:} in EWRAM", .{addr}), + 0x0400_0000...0x0400_03FE => self.io.read16(addr), // Internal Display Memory - 0x0500_0000...0x0500_03FF => std.debug.panic("read16 from 0x{X:} in BG/OBJ Palette RAM", .{addr}), - 0x0600_0000...0x0601_7FFF => std.debug.panic("read16 from 0x{X:} in VRAM", .{addr}), - 0x0700_0000...0x0700_03FF => std.debug.panic("read16 from 0x{X:} in OAM", .{addr}), + 0x0500_0000...0x0500_03FF => std.debug.panic("[Bus:16] read from 0x{X:} in BG/OBJ Palette RAM", .{addr}), + 0x0600_0000...0x0601_7FFF => std.debug.panic("[Bus:16] read from 0x{X:} in VRAM", .{addr}), + 0x0700_0000...0x0700_03FF => std.debug.panic("[Bus:16] read from 0x{X:} in OAM", .{addr}), // External Memory (Game Pak) 0x0800_0000...0x09FF_FFFF => self.pak.get16(@as(usize, addr - 0x0800_0000)), @@ -78,27 +81,27 @@ pub const Bus = struct { 0x0C00_0000...0x0DFF_FFFF => self.pak.get16(@as(usize, addr - 0x0C00_0000)), else => { - std.log.warn("ZBA tried to read16 from 0x{X:}", .{addr}); + std.log.warn("[Bus:16] ZBA tried to read from 0x{X:}", .{addr}); return 0x0000; }, }; } - pub fn write16(_: *@This(), addr: u32, halfword: u16) void { + pub fn write16(self: *@This(), addr: u32, halfword: u16) void { // TODO: write16 can write to GamePak Flash switch (addr) { // General Internal Memory - 0x0200_0000...0x0203FFFF => std.debug.panic("write16 0x{X:} to 0x{X:} in IWRAM", .{ halfword, addr }), - 0x0300_0000...0x0300_7FFF => std.debug.panic("write16 0x{X:} to 0x{X:} in EWRAM", .{ halfword, addr }), - 0x0400_0000...0x0400_03FE => std.debug.panic("write16 0x{X:} to 0x{X:} in I/O", .{ halfword, addr }), + 0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:16] write 0x{X:} to 0x{X:} in IWRAM", .{ halfword, addr }), + 0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:16] write 0x{X:} to 0x{X:} in EWRAM", .{ halfword, addr }), + 0x0400_0000...0x0400_03FE => self.io.write16(addr, halfword), // Internal Display Memory - 0x0500_0000...0x0500_03FF => std.debug.panic("write16 0x{X:} to 0x{X:} in BG/OBJ Palette RAM", .{ halfword, addr }), - 0x0600_0000...0x0601_7FFF => std.debug.panic("write16 0x{X:} to 0x{X:} in VRAM", .{ halfword, addr }), - 0x0700_0000...0x0700_03FF => std.debug.panic("write16 0x{X:} to 0x{X:} in OAM", .{ halfword, addr }), + 0x0500_0000...0x0500_03FF => std.debug.panic("[Bus:16] write 0x{X:} to 0x{X:} in BG/OBJ Palette RAM", .{ halfword, addr }), + 0x0600_0000...0x0601_7FFF => std.debug.panic("[Bus:16] write 0x{X:} to 0x{X:} in VRAM", .{ halfword, addr }), + 0x0700_0000...0x0700_03FF => std.debug.panic("[Bus:16] write 0x{X:} to 0x{X:} in OAM", .{ halfword, addr }), - else => std.log.warn("ZBA tried to write16 0x{X:} to 0x{X:}", .{ halfword, addr }), + else => std.log.warn("[Bus:16] ZBA tried to write 0x{X:} to 0x{X:}", .{ halfword, addr }), } } @@ -106,23 +109,23 @@ pub const Bus = struct { return switch (addr) { // General Internal Memory 0x0000_0000...0x0000_3FFF => self.bios.get8(@as(usize, addr)), - 0x0200_0000...0x0203FFFF => std.debug.panic("read8 from 0x{X:} in IWRAM", .{addr}), - 0x0300_0000...0x0300_7FFF => std.debug.panic("read8 from 0x{X:} in EWRAM", .{addr}), - 0x0400_0000...0x0400_03FE => std.debug.panic("read8 from 0x{X:} in I/O", .{addr}), + 0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:8] read from 0x{X:} in IWRAM", .{addr}), + 0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:8] read from 0x{X:} in EWRAM", .{addr}), + 0x0400_0000...0x0400_03FE => self.io.read8(addr), // Internal Display Memory - 0x0500_0000...0x0500_03FF => std.debug.panic("read8 from 0x{X:} in BG/OBJ Palette RAM", .{addr}), - 0x0600_0000...0x0601_7FFF => std.debug.panic("read8 from 0x{X:} in VRAM", .{addr}), - 0x0700_0000...0x0700_03FF => std.debug.panic("read8 from 0x{X:} in OAM", .{addr}), + 0x0500_0000...0x0500_03FF => std.debug.panic("[Bus:8] read from 0x{X:} in BG/OBJ Palette RAM", .{addr}), + 0x0600_0000...0x0601_7FFF => std.debug.panic("[Bus:8] read from 0x{X:} in VRAM", .{addr}), + 0x0700_0000...0x0700_03FF => std.debug.panic("[Bus:8] read from 0x{X:} in OAM", .{addr}), // External Memory (Game Pak) 0x0800_0000...0x09FF_FFFF => self.pak.get8(@as(usize, addr - 0x0800_0000)), 0x0A00_0000...0x0BFF_FFFF => self.pak.get8(@as(usize, addr - 0x0A00_0000)), 0x0C00_0000...0x0DFF_FFFF => self.pak.get8(@as(usize, addr - 0x0C00_0000)), - 0x0E00_0000...0x0E00_FFFF => std.debug.panic("read8 from 0x{X:} in Game Pak SRAM", .{addr}), + 0x0E00_0000...0x0E00_FFFF => std.debug.panic("[Bus:8] read from 0x{X:} in Game Pak SRAM", .{addr}), else => { - std.log.warn("ZBA tried to read8 from 0x{X:}", .{addr}); + std.log.warn("[Bus:8] ZBA tried to read from 0x{X:}", .{addr}); return 0x00; }, }; @@ -131,13 +134,13 @@ pub const Bus = struct { pub fn write8(_: *@This(), addr: u32, byte: u8) void { switch (addr) { // General Internal Memory - 0x0200_0000...0x0203FFFF => std.debug.panic("write8 0x{X:} to 0x{X:} in IWRAM", .{ byte, addr }), - 0x0300_0000...0x0300_7FFF => std.debug.panic("write8 0x{X:} to 0x{X:} in EWRAM", .{ byte, addr }), - 0x0400_0000...0x0400_03FE => std.debug.panic("write8 0x{X:} to 0x{X:} in I/O", .{ byte, addr }), + 0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:8] write 0x{X:} to 0x{X:} in IWRAM", .{ byte, addr }), + 0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:8] write 0x{X:} to 0x{X:} in EWRAM", .{ byte, addr }), + 0x0400_0000...0x0400_03FE => std.debug.panic("[Bus:8] write 0x{X:} to 0x{X:} in I/O", .{ byte, addr }), // External Memory (Game Pak) - 0x0E00_0000...0x0E00_FFFF => std.debug.panic("write8 0x{X:} to 0x{X:} in Game Pak SRAM", .{ byte, addr }), - else => std.log.warn("ZBA tried to write8 0x{X:} to 0x{X:}", .{ byte, addr }), + 0x0E00_0000...0x0E00_FFFF => std.debug.panic("[Bus:8] write 0x{X:} to 0x{X:} in Game Pak SRAM", .{ byte, addr }), + else => std.log.warn("[Bus:8] ZBA tried to write 0x{X:} to 0x{X:}", .{ byte, addr }), } } }; diff --git a/src/bus/io.zig b/src/bus/io.zig new file mode 100644 index 0000000..8e38187 --- /dev/null +++ b/src/bus/io.zig @@ -0,0 +1,56 @@ +const std = @import("std"); +const bitfield = @import("bitfield"); + +const Bitfield = bitfield.Bitfield; +const Bit = bitfield.Bit; + +pub const Io = struct { + dispcnt: Dispcnt, + + pub fn init() @This() { + return .{ + .dispcnt = .{ .val = 0x0000_0000 }, + }; + } + + pub fn read32(self: *const @This(), addr: u32) u32 { + return switch (addr) { + 0x0400_0000 => @as(u32, self.dispcnt.val), + else => std.debug.panic("[I/O:32] tried to read from {X:}", .{addr}), + }; + } + + pub fn read16(self: *const @This(), addr: u32) u16 { + return switch (addr) { + 0x0400_0000 => self.dispcnt.val, + else => std.debug.panic("[I/O:16] tried to read from {X:}", .{addr}), + }; + } + + pub fn write16(self: *@This(), addr: u32, halfword: u16) void { + switch (addr) { + 0x0400_000 => self.dispcnt.val = halfword, + else => std.debug.panic("[I/O:16] tried to write {X:} to {X:}", .{ halfword, addr }), + } + } + + pub fn read8(self: *const @This(), addr: u32) u8 { + return switch (addr) { + 0x0400_0000 => @truncate(u8, self.dispcnt.val), + else => std.debug.panic("[I/O:8] tried to read from {X:}", .{addr}), + }; + } +}; + +const Dispcnt = extern union { + bg_mode: Bitfield(u16, 0, 3), + frame_select: Bit(u16, 4), + hblank_interval_free: Bit(u16, 5), + obj_mapping: Bit(u16, 6), + forced_blank: Bit(u16, 7), + bg_enable: Bitfield(u16, 8, 4), + obj_enable: Bit(u16, 12), + win_enable: Bitfield(u16, 13, 2), + obj_win_enable: Bit(u16, 15), + val: u16, +}; diff --git a/src/cpu.zig b/src/cpu.zig index 49661a8..18b995c 100644 --- a/src/cpu.zig +++ b/src/cpu.zig @@ -71,7 +71,7 @@ fn checkCond(cpsr: *const CPSR, opcode: u32) bool { 0xC => !cpsr.z.read() and (cpsr.n.read() == cpsr.z.read()), // GT - Greater than 0xD => cpsr.z.read() or (cpsr.n.read() != cpsr.v.read()), // LE - Less than or equal 0xE => true, // AL - Always - 0xF => std.debug.panic("0xF is a reserved condition field", .{}), + 0xF => std.debug.panic("[CPU] 0xF is a reserved condition field", .{}), }; } @@ -145,7 +145,7 @@ const Mode = enum(u5) { fn undefinedInstruction(_: *Arm7tdmi, _: *Bus, opcode: u32) void { const id = armIdx(opcode); - std.debug.panic("[0x{X:}] 0x{X:} is an illegal opcode", .{ id, opcode }); + std.debug.panic("[CPU] {{0x{X:}}} 0x{X:} is an illegal opcode", .{ id, opcode }); } fn comptimeBranch(comptime L: bool) InstrFn { diff --git a/src/cpu/data_processing.zig b/src/cpu/data_processing.zig index f406029..a7ebb84 100644 --- a/src/cpu/data_processing.zig +++ b/src/cpu/data_processing.zig @@ -23,13 +23,13 @@ pub fn comptimeDataProcessing(comptime I: bool, comptime S: bool, comptime instr // ADD cpu.r[rd] = cpu.r[op1] + op2; - if (S) std.debug.panic("TODO: implement ADD condition codes", .{}); + if (S) std.debug.panic("[CPU] TODO: implement ADD condition codes", .{}); }, 0xD => { // MOV cpu.r[rd] = op2; - if (S) std.debug.panic("TODO: implement MOV condition codes", .{}); + if (S) std.debug.panic("[CPU] implement MOV condition codes", .{}); }, 0xA => { // CMP @@ -45,7 +45,7 @@ pub fn comptimeDataProcessing(comptime I: bool, comptime S: bool, comptime instr cpu.cpsr.z.write(result == 0x00); cpu.cpsr.n.write(result >> 31 & 0x01 == 0x01); }, - else => std.debug.panic("TODO: implement data processing type {}", .{instrKind}), + else => std.debug.panic("[CPU] TODO: implement data processing type {}", .{instrKind}), } } }.dataProcessing; diff --git a/src/cpu/half_signed_data_transfer.zig b/src/cpu/half_signed_data_transfer.zig index ef49fe6..e84149e 100644 --- a/src/cpu/half_signed_data_transfer.zig +++ b/src/cpu/half_signed_data_transfer.zig @@ -30,7 +30,7 @@ pub fn comptimeHalfSignedDataTransfer(comptime P: bool, comptime U: bool, compti switch (@truncate(u2, opcode >> 5)) { 0b00 => { // SWP - std.debug.panic("TODO: Implement SWP", .{}); + std.debug.panic("[CPU] TODO: Implement SWP", .{}); }, 0b01 => { // LDRH @@ -56,7 +56,7 @@ pub fn comptimeHalfSignedDataTransfer(comptime P: bool, comptime U: bool, compti bus.write16(address + 2, src); bus.write16(address, src); } else { - std.debug.panic("TODO Figure out if this is also SWP", .{}); + std.debug.panic("[CPU] TODO: Figure out if this is also SWP", .{}); } } diff --git a/src/scheduler.zig b/src/scheduler.zig index 9e80c10..7ffc95d 100644 --- a/src/scheduler.zig +++ b/src/scheduler.zig @@ -29,7 +29,7 @@ pub const Scheduler = struct { switch (event.kind) { .HeatDeath => { - std.debug.panic("Somehow, a u64 overflowed", .{}); + std.debug.panic("[Scheduler] Somehow, a u64 overflowed", .{}); }, } }