const std = @import("std"); const Bios = @import("bus/Bios.zig"); const Ewram = @import("bus/Ewram.zig"); const GamePak = @import("bus/GamePak.zig"); const Io = @import("bus/io.zig").Io; const Iwram = @import("bus/Iwram.zig"); const Ppu = @import("ppu.zig").Ppu; const Scheduler = @import("scheduler.zig").Scheduler; const Allocator = std.mem.Allocator; const Self = @This(); pak: GamePak, bios: Bios, ppu: Ppu, iwram: Iwram, ewram: Ewram, io: Io, pub fn init(alloc: Allocator, sched: *Scheduler, path: []const u8) !Self { return Self{ .pak = try GamePak.init(alloc, path), .bios = try Bios.init(alloc, "./bin/gba_bios.bin"), // TODO: don't hardcode this + bundle open-sorce Boot ROM .ppu = try Ppu.init(alloc, sched), .iwram = try Iwram.init(alloc), .ewram = try Ewram.init(alloc), .io = Io.init(), }; } pub fn deinit(self: Self) void { self.iwram.deinit(); self.ewram.deinit(); self.pak.deinit(); self.bios.deinit(); self.ppu.deinit(); } pub fn read32(self: *const Self, addr: u32) u32 { return switch (addr) { // General Internal Memory 0x0000_0000...0x0000_3FFF => self.bios.get32(@as(usize, addr)), 0x0200_0000...0x0203_FFFF => self.iwram.get32(addr - 0x0200_0000), 0x0300_0000...0x0300_7FFF => self.ewram.get32(addr - 0x0300_0000), 0x0400_0000...0x0400_03FE => self.io.read32(addr), // Internal Display Memory 0x0500_0000...0x0500_03FF => self.ppu.palette.get32(@as(usize, addr - 0x0500_0000)), 0x0600_0000...0x0601_7FFF => self.ppu.vram.get32(@as(usize, addr - 0x0600_0000)), 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)), 0x0A00_0000...0x0BFF_FFFF => self.pak.get32(@as(usize, addr - 0x0A00_0000)), 0x0C00_0000...0x0DFF_FFFF => self.pak.get32(@as(usize, addr - 0x0C00_0000)), else => { std.log.warn("[Bus:32] ZBA tried to read from 0x{X:}", .{addr}); return 0x0000_0000; }, }; } pub fn write32(self: *Self, addr: u32, word: u32) void { // TODO: write32 can write to GamePak Flash switch (addr) { // General Internal Memory 0x0200_0000...0x0203_FFFF => self.iwram.set32(addr - 0x0200_0000, word), 0x0300_0000...0x0300_7FFF => self.ewram.set32(addr - 0x0300_0000, word), 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 => self.ppu.palette.set32(@as(usize, addr - 0x0500_0000), word), 0x0600_0000...0x0601_7FFF => self.ppu.vram.set32(@as(usize, addr - 0x0600_0000), word), 0x0700_0000...0x0700_03FF => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in OAM", .{ word, addr }), else => std.log.warn("[Bus:32] ZBA tried to write 0x{X:} to 0x{X:}", .{ word, addr }), } } pub fn read16(self: *const Self, addr: u32) u16 { return switch (addr) { // General Internal Memory 0x0000_0000...0x0000_3FFF => self.bios.get16(@as(usize, addr)), 0x0200_0000...0x0203_FFFF => self.iwram.get16(addr - 0x0200_0000), 0x0300_0000...0x0300_7FFF => self.ewram.get16(addr - 0x0300_0000), 0x0400_0000...0x0400_03FE => self.io.read16(addr), // Internal Display Memory 0x0500_0000...0x0500_03FF => self.ppu.palette.get16(@as(usize, addr - 0x0500_0000)), 0x0600_0000...0x0601_7FFF => self.ppu.vram.get16(@as(usize, addr - 0x0600_0000)), 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)), 0x0A00_0000...0x0BFF_FFFF => self.pak.get16(@as(usize, addr - 0x0A00_0000)), 0x0C00_0000...0x0DFF_FFFF => self.pak.get16(@as(usize, addr - 0x0C00_0000)), else => { std.log.warn("[Bus:16] ZBA tried to read from 0x{X:}", .{addr}); return 0x0000; }, }; } pub fn write16(self: *Self, addr: u32, halfword: u16) void { // TODO: write16 can write to GamePak Flash switch (addr) { // General Internal Memory 0x0200_0000...0x0203_FFFF => self.iwram.set16(addr - 0x0200_0000, halfword), 0x0300_0000...0x0300_7FFF => self.ewram.set16(addr - 0x0300_0000, halfword), 0x0400_0000...0x0400_03FE => self.io.write16(addr, halfword), // Internal Display Memory 0x0500_0000...0x0500_03FF => self.ppu.palette.set16(@as(usize, addr - 0x0500_0000), halfword), 0x0600_0000...0x0601_7FFF => self.ppu.vram.set16(@as(usize, addr - 0x0600_0000), halfword), 0x0700_0000...0x0700_03FF => std.debug.panic("[Bus:16] write 0x{X:} to 0x{X:} in OAM", .{ halfword, addr }), else => std.log.warn("[Bus:16] ZBA tried to write 0x{X:} to 0x{X:}", .{ halfword, addr }), } } pub fn read8(self: *const Self, addr: u32) u8 { return switch (addr) { // General Internal Memory 0x0000_0000...0x0000_3FFF => self.bios.get8(@as(usize, addr)), 0x0200_0000...0x0203_FFFF => self.iwram.get8(addr - 0x0200_0000), 0x0300_0000...0x0300_7FFF => self.ewram.get8(addr - 0x0300_0000), 0x0400_0000...0x0400_03FE => self.io.read8(addr), // Internal Display Memory 0x0500_0000...0x0500_03FF => self.ppu.palette.get8(@as(usize, addr - 0x0500_0000)), 0x0600_0000...0x0601_7FFF => self.ppu.vram.get8(@as(usize, addr - 0x0600_0000)), 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("[Bus:8] read from 0x{X:} in Game Pak SRAM", .{addr}), else => { std.log.warn("[Bus:8] ZBA tried to read from 0x{X:}", .{addr}); return 0x00; }, }; } pub fn write8(self: *Self, addr: u32, byte: u8) void { switch (addr) { // General Internal Memory 0x0200_0000...0x0203_FFFF => self.iwram.set8(addr - 0x0200_0000, byte), 0x0300_0000...0x0300_7FFF => self.ewram.set8(addr - 0x0300_0000, byte), 0x0400_0000...0x0400_03FE => self.io.set8(addr - 0x0400_0000, byte), // External Memory (Game Pak) 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 }), } }