fix(emu): share same main mem allocation between ARM7 + ARM9
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cef711a497
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@ -3,6 +3,7 @@ const nds9 = @import("nds9.zig");
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const nds7 = @import("nds7.zig");
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const Header = @import("cartridge.zig").Header;
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const SharedIo = @import("io.zig").Io;
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const Arm946es = nds9.Arm946es;
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const Allocator = std.mem.Allocator;
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@ -107,3 +108,26 @@ pub fn runFrame(nds7_group: nds7.Group, nds9_group: nds9.Group) void {
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}
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}
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}
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// FIXME: Perf win to allocating on the stack instead?
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pub const SharedContext = struct {
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const MiB = 0x100000;
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io: *SharedIo,
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main: *[4 * MiB]u8,
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pub fn init(allocator: Allocator) !@This() {
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const ctx = .{
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.io = try allocator.create(SharedIo),
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.main = try allocator.create([4 * MiB]u8),
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};
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ctx.io.* = .{};
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return ctx;
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}
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pub fn deinit(self: @This(), allocator: Allocator) void {
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allocator.destroy(self.io);
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allocator.destroy(self.main);
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}
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};
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@ -4,6 +4,7 @@ const io = @import("io.zig");
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const Scheduler = @import("Scheduler.zig");
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const SharedIo = @import("../io.zig").Io;
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const SharedContext = @import("../emu.zig").SharedContext;
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const Allocator = std.mem.Allocator;
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@ -18,20 +19,16 @@ main: *[4 * MiB]u8,
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wram: *[64 * KiB]u8,
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io: io.Io,
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pub fn init(allocator: Allocator, scheduler: *Scheduler, shared_io: *SharedIo) !@This() {
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const main_mem = try allocator.create([4 * MiB]u8);
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errdefer allocator.destroy(main_mem);
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@memset(main_mem, 0);
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pub fn init(allocator: Allocator, scheduler: *Scheduler, shared_ctx: SharedContext) !@This() {
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const wram = try allocator.create([64 * KiB]u8);
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errdefer allocator.destroy(wram);
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@memset(wram, 0);
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return .{
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.main = main_mem,
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.main = shared_ctx.main,
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.wram = wram,
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.scheduler = scheduler,
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.io = io.Io.init(shared_io),
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.io = io.Io.init(shared_ctx.io),
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};
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}
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@ -2,7 +2,7 @@ const std = @import("std");
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const Ppu = @import("../ppu.zig").Ppu;
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const Scheduler = @import("Scheduler.zig");
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const SharedIo = @import("../io.zig").Io;
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const SharedContext = @import("../emu.zig").SharedContext;
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const io = @import("io.zig");
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const Allocator = std.mem.Allocator;
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@ -20,11 +20,7 @@ ppu: Ppu,
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scheduler: *Scheduler,
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pub fn init(allocator: Allocator, scheduler: *Scheduler, shared_io: *SharedIo) !@This() {
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const main_mem = try allocator.create([4 * MiB]u8);
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errdefer allocator.destroy(main_mem);
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@memset(main_mem, 0);
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pub fn init(allocator: Allocator, scheduler: *Scheduler, shared_ctx: SharedContext) !@This() {
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const vram1_mem = try allocator.create([512 * KiB]u8);
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errdefer allocator.destroy(vram1_mem);
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@memset(vram1_mem, 0);
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@ -33,11 +29,11 @@ pub fn init(allocator: Allocator, scheduler: *Scheduler, shared_io: *SharedIo) !
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scheduler.push(.draw, 256 * dots_per_cycle);
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return .{
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.main = main_mem,
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.main = shared_ctx.main,
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.vram1 = vram1_mem,
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.ppu = try Ppu.init(allocator),
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.scheduler = scheduler,
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.io = io.Io.init(shared_io),
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.io = io.Io.init(shared_ctx.io),
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};
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}
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12
src/main.zig
12
src/main.zig
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@ -8,7 +8,7 @@ const emu = @import("core/emu.zig");
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const IBus = @import("arm32").Bus;
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const IScheduler = @import("arm32").Scheduler;
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const Ui = @import("platform.zig").Ui;
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const SharedIo = @import("core/io.zig").Io;
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const SharedContext = @import("core/emu.zig").SharedContext;
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const Allocator = std.mem.Allocator;
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const ClapResult = clap.Result(clap.Help, &cli_params, clap.parsers.default);
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@ -36,14 +36,12 @@ pub fn main() !void {
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const rom_file = try std.fs.cwd().openFile(rom_path, .{});
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defer rom_file.close();
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// FIXME: Perf win to allocating on the stack instead?
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const shared_io = try allocator.create(SharedIo);
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defer allocator.destroy(shared_io);
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shared_io.* = .{};
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const shared_ctx = try SharedContext.init(allocator);
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defer shared_ctx.deinit(allocator);
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const nds9_group: nds9.Group = blk: {
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var scheduler = try nds9.Scheduler.init(allocator);
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var bus = try nds9.Bus.init(allocator, &scheduler, shared_io);
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var bus = try nds9.Bus.init(allocator, &scheduler, shared_ctx);
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var arm946es = nds9.Arm946es.init(IScheduler.init(&scheduler), IBus.init(&bus));
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break :blk .{ .cpu = &arm946es, .bus = &bus, .scheduler = &scheduler };
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@ -52,7 +50,7 @@ pub fn main() !void {
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const nds7_group: nds7.Group = blk: {
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var scheduler = try nds7.Scheduler.init(allocator);
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var bus = try nds7.Bus.init(allocator, &scheduler, shared_io);
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var bus = try nds7.Bus.init(allocator, &scheduler, shared_ctx);
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var arm7tdmi = nds7.Arm7tdmi.init(IScheduler.init(&scheduler), IBus.init(&bus));
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break :blk .{ .cpu = &arm7tdmi, .bus = &bus, .scheduler = &scheduler };
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