165 lines
6.3 KiB
Zig
165 lines
6.3 KiB
Zig
const std = @import("std");
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const Bios = @import("bus/Bios.zig");
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const Ewram = @import("bus/Ewram.zig");
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const GamePak = @import("bus/GamePak.zig");
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const Io = @import("bus/io.zig").Io;
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const Iwram = @import("bus/Iwram.zig");
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const Ppu = @import("ppu.zig").Ppu;
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const Scheduler = @import("scheduler.zig").Scheduler;
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const io = @import("bus/io.zig");
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const Allocator = std.mem.Allocator;
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const log = std.log.scoped(.Bus);
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const Self = @This();
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pak: GamePak,
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bios: Bios,
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ppu: Ppu,
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iwram: Iwram,
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ewram: Ewram,
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io: Io,
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pub fn init(alloc: Allocator, sched: *Scheduler, rom_path: []const u8, maybe_bios: ?[]const u8) !Self {
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return Self{
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.pak = try GamePak.init(alloc, rom_path),
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.bios = try Bios.init(alloc, maybe_bios),
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.ppu = try Ppu.init(alloc, sched),
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.iwram = try Iwram.init(alloc),
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.ewram = try Ewram.init(alloc),
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.io = Io.init(),
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};
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}
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pub fn deinit(self: Self) void {
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self.iwram.deinit();
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self.ewram.deinit();
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self.pak.deinit();
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self.bios.deinit();
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self.ppu.deinit();
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}
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pub fn read32(self: *const Self, addr: u32) u32 {
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return switch (addr) {
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// General Internal Memory
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0x0000_0000...0x0000_3FFF => self.bios.get32(addr),
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0x0200_0000...0x0203_FFFF => self.iwram.get32(addr - 0x0200_0000),
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0x0300_0000...0x0300_7FFF => self.ewram.get32(addr - 0x0300_0000),
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0x0400_0000...0x0400_03FE => io.read32(self, addr),
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// Internal Display Memory
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0x0500_0000...0x0500_03FF => self.ppu.palette.get32(addr - 0x0500_0000),
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0x0600_0000...0x0601_7FFF => self.ppu.vram.get32(addr - 0x0600_0000),
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0x0700_0000...0x0700_03FF => self.ppu.oam.get32(addr - 0x0700_0000),
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// External Memory (Game Pak)
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0x0800_0000...0x09FF_FFFF => self.pak.get32(addr - 0x0800_0000),
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0x0A00_0000...0x0BFF_FFFF => self.pak.get32(addr - 0x0A00_0000),
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0x0C00_0000...0x0DFF_FFFF => self.pak.get32(addr - 0x0C00_0000),
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else => {
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log.warn("32-bit read from 0x{X:0>8}", .{addr});
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return 0x0000_0000;
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},
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};
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}
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pub fn write32(self: *Self, addr: u32, word: u32) void {
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// TODO: write32 can write to GamePak Flash
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switch (addr) {
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// General Internal Memory
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0x0200_0000...0x0203_FFFF => self.iwram.set32(addr - 0x0200_0000, word),
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0x0300_0000...0x0300_7FFF => self.ewram.set32(addr - 0x0300_0000, word),
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0x0400_0000...0x0400_03FE => io.write32(self, addr, word),
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// Internal Display Memory
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0x0500_0000...0x0500_03FF => self.ppu.palette.set32(addr - 0x0500_0000, word),
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0x0600_0000...0x0601_7FFF => self.ppu.vram.set32(addr - 0x0600_0000, word),
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0x0700_0000...0x0700_03FF => self.ppu.oam.set32(addr - 0x0700_0000, word),
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else => log.warn("32-bit write of 0x{X:0>8} to 0x{X:0>8}", .{ word, addr }),
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}
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}
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pub fn read16(self: *const Self, addr: u32) u16 {
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return switch (addr) {
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// General Internal Memory
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0x0000_0000...0x0000_3FFF => self.bios.get16(addr),
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0x0200_0000...0x0203_FFFF => self.iwram.get16(addr - 0x0200_0000),
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0x0300_0000...0x0300_7FFF => self.ewram.get16(addr - 0x0300_0000),
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0x0400_0000...0x0400_03FE => io.read16(self, addr),
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// Internal Display Memory
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0x0500_0000...0x0500_03FF => self.ppu.palette.get16(addr - 0x0500_0000),
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0x0600_0000...0x0601_7FFF => self.ppu.vram.get16(addr - 0x0600_0000),
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0x0700_0000...0x0700_03FF => self.ppu.oam.get16(addr - 0x0700_0000),
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// External Memory (Game Pak)
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0x0800_0000...0x09FF_FFFF => self.pak.get16(addr - 0x0800_0000),
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0x0A00_0000...0x0BFF_FFFF => self.pak.get16(addr - 0x0A00_0000),
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0x0C00_0000...0x0DFF_FFFF => self.pak.get16(addr - 0x0C00_0000),
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else => {
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log.warn("16-bit read from 0x{X:0>8}", .{addr});
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return 0x0000;
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},
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};
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}
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pub fn write16(self: *Self, addr: u32, halfword: u16) void {
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// TODO: write16 can write to GamePak Flash
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switch (addr) {
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// General Internal Memory
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0x0200_0000...0x0203_FFFF => self.iwram.set16(addr - 0x0200_0000, halfword),
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0x0300_0000...0x0300_7FFF => self.ewram.set16(addr - 0x0300_0000, halfword),
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0x0400_0000...0x0400_03FE => io.write16(self, addr, halfword),
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// Internal Display Memory
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0x0500_0000...0x0500_03FF => self.ppu.palette.set16(addr - 0x0500_0000, halfword),
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0x0600_0000...0x0601_7FFF => self.ppu.vram.set16(addr - 0x0600_0000, halfword),
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0x0700_0000...0x0700_03FF => self.ppu.oam.set16(addr - 0x0700_0000, halfword),
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else => log.warn("16-bit write of 0x{X:0>4} to 0x{X:0>8}", .{ halfword, addr }),
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}
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}
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pub fn read8(self: *const Self, addr: u32) u8 {
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return switch (addr) {
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// General Internal Memory
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0x0000_0000...0x0000_3FFF => self.bios.get8(addr),
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0x0200_0000...0x0203_FFFF => self.iwram.get8(addr - 0x0200_0000),
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0x0300_0000...0x0300_7FFF => self.ewram.get8(addr - 0x0300_0000),
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0x0400_0000...0x0400_03FE => io.read8(self, addr),
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// Internal Display Memory
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0x0500_0000...0x0500_03FF => self.ppu.palette.get8(addr - 0x0500_0000),
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0x0600_0000...0x0601_7FFF => self.ppu.vram.get8(addr - 0x0600_0000),
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0x0700_0000...0x0700_03FF => self.ppu.oam.get8(addr - 0x0700_0000),
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// External Memory (Game Pak)
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0x0800_0000...0x09FF_FFFF => self.pak.get8(addr - 0x0800_0000),
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0x0A00_0000...0x0BFF_FFFF => self.pak.get8(addr - 0x0A00_0000),
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0x0C00_0000...0x0DFF_FFFF => self.pak.get8(addr - 0x0C00_0000),
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0x0E00_0000...0x0E00_FFFF => std.debug.panic("[Bus:8] read from 0x{X:} in Game Pak SRAM", .{addr}),
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else => {
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log.warn("8-bit read from 0x{X:0>8}", .{addr});
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return 0x00;
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},
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};
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}
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pub fn write8(self: *Self, addr: u32, byte: u8) void {
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switch (addr) {
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// General Internal Memory
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0x0200_0000...0x0203_FFFF => self.iwram.set8(addr - 0x0200_0000, byte),
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0x0300_0000...0x0300_7FFF => self.ewram.set8(addr - 0x0300_0000, byte),
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0x0400_0000...0x0400_03FE => io.write8(self, addr, byte),
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// External Memory (Game Pak)
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0x0E00_0000...0x0E00_FFFF => std.debug.panic("[Bus:8] write 0x{X:} to 0x{X:} in Game Pak SRAM", .{ byte, addr }),
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else => log.warn("8-bit write of 0x{X:0>2} to 0x{X:0>8}", .{ byte, addr }),
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}
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}
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