feat(bus): implement IWRAM and EWRAM
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parent
fd5006b29d
commit
0f08ad05be
36
src/Bus.zig
36
src/Bus.zig
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@ -1,8 +1,10 @@
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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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@ -12,6 +14,8 @@ 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, path: []const u8) !Self {
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@ -19,11 +23,15 @@ pub fn init(alloc: Allocator, sched: *Scheduler, path: []const u8) !Self {
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.pak = try GamePak.init(alloc, path),
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.bios = try Bios.init(alloc, "./bin/gba_bios.bin"), // TODO: don't hardcode this + bundle open-sorce Boot ROM
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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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@ -33,8 +41,8 @@ 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(@as(usize, addr)),
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0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:32] read from 0x{X:} in IWRAM", .{addr}),
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0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:32] read from 0x{X:} in EWRAM", .{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 => self.read32(addr),
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// Internal Display Memory
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@ -59,8 +67,8 @@ pub fn write32(self: *Self, addr: u32, word: u32) void {
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switch (addr) {
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// General Internal Memory
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0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in IWRAM", .{ word, addr }),
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0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in EWRAM", .{ word, addr }),
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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 => std.debug.panic("[Bus:32] wrote 0x{X:} to 0x{X:} in I/O", .{ word, addr }),
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// Internal Display Memory
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@ -76,8 +84,8 @@ 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(@as(usize, addr)),
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0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:16] read from 0x{X:} in IWRAM", .{addr}),
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0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:16] read from 0x{X:} in EWRAM", .{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 => self.io.read16(addr),
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// Internal Display Memory
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@ -101,8 +109,8 @@ 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 => std.debug.panic("[Bus:16] write 0x{X:} to 0x{X:} in IWRAM", .{ halfword, addr }),
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0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:16] write 0x{X:} to 0x{X:} in EWRAM", .{ halfword, addr }),
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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 => self.io.write16(addr, halfword),
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// Internal Display Memory
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@ -118,8 +126,8 @@ 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(@as(usize, addr)),
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0x0200_0000...0x0203_FFFF => std.debug.panic("[Bus:8] read from 0x{X:} in IWRAM", .{addr}),
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0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:8] read from 0x{X:} in EWRAM", .{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 => self.io.read8(addr),
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// Internal Display Memory
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@ -140,12 +148,12 @@ pub fn read8(self: *const Self, addr: u32) u8 {
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};
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}
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pub fn write8(_: *Self, addr: u32, byte: u8) void {
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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 => std.debug.panic("[Bus:8] write 0x{X:} to 0x{X:} in IWRAM", .{ byte, addr }),
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0x0300_0000...0x0300_7FFF => std.debug.panic("[Bus:8] write 0x{X:} to 0x{X:} in EWRAM", .{ byte, addr }),
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0x0400_0000...0x0400_03FE => std.debug.panic("[Bus:8] write 0x{X:} to 0x{X:} in I/O", .{ byte, addr }),
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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 => self.io.set8(addr - 0x0400_0000, 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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@ -0,0 +1,46 @@
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const std = @import("std");
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const Allocator = std.mem.Allocator;
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const Self = @This();
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buf: []u8,
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alloc: Allocator,
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pub fn init(alloc: Allocator) !Self {
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return Self{
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.buf = try alloc.alloc(u8, 0x8000),
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.alloc = alloc,
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};
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}
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pub fn deinit(self: Self) void {
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self.alloc.free(self.buf);
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}
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pub fn get32(self: *const Self, idx: usize) u32 {
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return (@as(u32, self.buf[idx + 3]) << 24) | (@as(u32, self.buf[idx + 2]) << 16) | (@as(u32, self.buf[idx + 1]) << 8) | (@as(u32, self.buf[idx]));
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}
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pub fn set32(self: *Self, idx: usize, word: u32) void {
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self.buf[idx + 3] = @truncate(u8, word >> 24);
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self.buf[idx + 2] = @truncate(u8, word >> 16);
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self.buf[idx + 1] = @truncate(u8, word >> 8);
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self.buf[idx] = @truncate(u8, word);
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}
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pub fn get16(self: *const Self, idx: usize) u16 {
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return (@as(u16, self.buf[idx + 1]) << 8) | @as(u16, self.buf[idx]);
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}
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pub fn set16(self: *Self, idx: usize, halfword: u16) void {
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self.buf[idx + 1] = @truncate(u8, halfword >> 8);
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self.buf[idx] = @truncate(u8, halfword);
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}
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pub fn get8(self: *const Self, idx: usize) u8 {
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return self.buf[idx];
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}
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pub fn set8(self: *Self, idx: usize, byte: u8) void {
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self.buf[idx] = byte;
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}
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@ -0,0 +1,44 @@
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const std = @import("std");
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const Allocator = std.mem.Allocator;
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const Self = @This();
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buf: []u8,
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alloc: Allocator,
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pub fn init(alloc: Allocator) !Self {
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return Self{
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.buf = try alloc.alloc(u8, 0x40000),
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.alloc = alloc,
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};
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}
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pub fn deinit(self: Self) void {
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self.alloc.free(self.buf);
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}
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pub fn get32(self: *const Self, idx: usize) u32 {
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return (@as(u32, self.get16(idx + 2)) << 16) | @as(u32, self.get16(idx));
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}
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pub fn set32(self: *Self, idx: usize, word: u32) void {
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self.set16(idx + 2, @truncate(u16, word >> 16));
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self.set16(idx, @truncate(u16, word));
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}
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pub fn get16(self: *const Self, idx: usize) u16 {
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return (@as(u16, self.buf[idx + 1]) << 8) | @as(u16, self.buf[idx]);
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}
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pub fn set16(self: *Self, idx: usize, halfword: u16) void {
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self.buf[idx + 1] = @truncate(u8, halfword >> 8);
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self.buf[idx] = @truncate(u8, halfword);
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}
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pub fn get8(self: *const Self, idx: usize) u8 {
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return self.buf[idx];
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}
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pub fn set8(self: *Self, idx: usize, byte: u8) void {
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self.buf[idx] = byte;
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}
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@ -52,6 +52,10 @@ pub const Io = struct {
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else => std.debug.panic("[I/O:8] tried to read from {X:}", .{addr}),
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};
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}
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pub fn set8(_: *Self, addr: u32, byte: u8) void {
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std.debug.panic("[I/0:8] tried to write 0x{X:} to 0x{X:}", .{ byte, addr });
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}
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};
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const DispCnt = extern union {
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