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feat(bus): implement IWRAM and EWRAM

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-01-10 07:59:21 -04:00
parent fd5006b29d
commit 0f08ad05be
4 changed files with 116 additions and 14 deletions
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36
src/Bus.zig
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@@ -1,8 +1,10 @@
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;
@@ -12,6 +14,8 @@ 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 {
@@ -19,11 +23,15 @@ pub fn init(alloc: Allocator, sched: *Scheduler, path: []const u8) !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();
@@ -33,8 +41,8 @@ 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 => 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}),
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.read32(addr),
// Internal Display Memory
@@ -59,8 +67,8 @@ pub fn write32(self: *Self, addr: u32, word: u32) void {
switch (addr) {
// General Internal Memory
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 }),
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
@@ -76,8 +84,8 @@ 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 => 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}),
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
@@ -101,8 +109,8 @@ 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 => 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 }),
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
@@ -118,8 +126,8 @@ 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 => 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}),
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
@@ -140,12 +148,12 @@ pub fn read8(self: *const Self, addr: u32) u8 {
};
}
pub fn write8(_: *Self, addr: u32, byte: u8) void {
pub fn write8(self: *Self, addr: u32, byte: u8) void {
switch (addr) {
// General Internal Memory
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 }),
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 }),