From 670347d4a06e3adf928bbda8e220ddea14389d31 Mon Sep 17 00:00:00 2001 From: Rekai Musuka Date: Fri, 21 Oct 2022 05:11:53 -0300 Subject: [PATCH] feat(bus): implement IWRAM and EWRAM --- src/Bus.zig | 36 ++++++++++++++++++++++-------------- src/bus/Ewram.zig | 46 ++++++++++++++++++++++++++++++++++++++++++++++ src/bus/Iwram.zig | 44 ++++++++++++++++++++++++++++++++++++++++++++ src/bus/io.zig | 4 ++++ 4 files changed, 116 insertions(+), 14 deletions(-) create mode 100644 src/bus/Ewram.zig create mode 100644 src/bus/Iwram.zig diff --git a/src/Bus.zig b/src/Bus.zig index 198fc4f..20ad799 100644 --- a/src/Bus.zig +++ b/src/Bus.zig @@ -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 }), diff --git a/src/bus/Ewram.zig b/src/bus/Ewram.zig new file mode 100644 index 0000000..54bf39e --- /dev/null +++ b/src/bus/Ewram.zig @@ -0,0 +1,46 @@ +const std = @import("std"); + +const Allocator = std.mem.Allocator; +const Self = @This(); + +buf: []u8, +alloc: Allocator, + +pub fn init(alloc: Allocator) !Self { + return Self{ + .buf = try alloc.alloc(u8, 0x8000), + .alloc = alloc, + }; +} + +pub fn deinit(self: Self) void { + self.alloc.free(self.buf); +} + +pub fn get32(self: *const Self, idx: usize) u32 { + 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])); +} + +pub fn set32(self: *Self, idx: usize, word: u32) void { + self.buf[idx + 3] = @truncate(u8, word >> 24); + self.buf[idx + 2] = @truncate(u8, word >> 16); + self.buf[idx + 1] = @truncate(u8, word >> 8); + self.buf[idx] = @truncate(u8, word); +} + +pub fn get16(self: *const Self, idx: usize) u16 { + return (@as(u16, self.buf[idx + 1]) << 8) | @as(u16, self.buf[idx]); +} + +pub fn set16(self: *Self, idx: usize, halfword: u16) void { + self.buf[idx + 1] = @truncate(u8, halfword >> 8); + self.buf[idx] = @truncate(u8, halfword); +} + +pub fn get8(self: *const Self, idx: usize) u8 { + return self.buf[idx]; +} + +pub fn set8(self: *Self, idx: usize, byte: u8) void { + self.buf[idx] = byte; +} diff --git a/src/bus/Iwram.zig b/src/bus/Iwram.zig new file mode 100644 index 0000000..4e0fdd1 --- /dev/null +++ b/src/bus/Iwram.zig @@ -0,0 +1,44 @@ +const std = @import("std"); + +const Allocator = std.mem.Allocator; +const Self = @This(); + +buf: []u8, +alloc: Allocator, + +pub fn init(alloc: Allocator) !Self { + return Self{ + .buf = try alloc.alloc(u8, 0x40000), + .alloc = alloc, + }; +} + +pub fn deinit(self: Self) void { + self.alloc.free(self.buf); +} + +pub fn get32(self: *const Self, idx: usize) u32 { + return (@as(u32, self.get16(idx + 2)) << 16) | @as(u32, self.get16(idx)); +} + +pub fn set32(self: *Self, idx: usize, word: u32) void { + self.set16(idx + 2, @truncate(u16, word >> 16)); + self.set16(idx, @truncate(u16, word)); +} + +pub fn get16(self: *const Self, idx: usize) u16 { + return (@as(u16, self.buf[idx + 1]) << 8) | @as(u16, self.buf[idx]); +} + +pub fn set16(self: *Self, idx: usize, halfword: u16) void { + self.buf[idx + 1] = @truncate(u8, halfword >> 8); + self.buf[idx] = @truncate(u8, halfword); +} + +pub fn get8(self: *const Self, idx: usize) u8 { + return self.buf[idx]; +} + +pub fn set8(self: *Self, idx: usize, byte: u8) void { + self.buf[idx] = byte; +} diff --git a/src/bus/io.zig b/src/bus/io.zig index 12e82ab..a934b7a 100644 --- a/src/bus/io.zig +++ b/src/bus/io.zig @@ -52,6 +52,10 @@ pub const Io = struct { else => std.debug.panic("[I/O:8] tried to read from {X:}", .{addr}), }; } + + pub fn set8(_: *Self, addr: u32, byte: u8) void { + std.debug.panic("[I/0:8] tried to write 0x{X:} to 0x{X:}", .{ byte, addr }); + } }; const DispCnt = extern union {