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feat: implement broken IPCFIFO

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This commit is contained in:
Rekai Nyangadzayi Musuka
2023-09-15 21:25:40 -05:00
parent 78eea74515
commit 5dbd681ba1
5 changed files with 163 additions and 46 deletions
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38
src/core/emu.zig
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@@ -70,25 +70,6 @@ const arm9_clock = bus_clock * 2;
pub fn runFrame(nds7_group: nds7.Group, nds9_group: nds9.Group) void {
// TODO: might be more efficient to run them both in the same loop?
{
const scheduler = nds7_group.scheduler;
const cycles_per_dot = arm7_clock / dot_clock + 1;
comptime std.debug.assert(cycles_per_dot == 6);
const cycles_per_frame = 355 * 263 * cycles_per_dot;
const frame_end = scheduler.tick + cycles_per_frame;
const cpu = nds7_group.cpu;
const bus = nds7_group.bus;
while (scheduler.tick < frame_end) {
cpu.step();
if (scheduler.tick >= scheduler.next()) scheduler.handle(bus);
}
}
{
const scheduler = nds9_group.scheduler;
@@ -107,6 +88,25 @@ pub fn runFrame(nds7_group: nds7.Group, nds9_group: nds9.Group) void {
if (scheduler.tick >= scheduler.next()) scheduler.handle(bus);
}
}
{
const scheduler = nds7_group.scheduler;
const cycles_per_dot = arm7_clock / dot_clock + 1;
comptime std.debug.assert(cycles_per_dot == 6);
const cycles_per_frame = 355 * 263 * cycles_per_dot;
const frame_end = scheduler.tick + cycles_per_frame;
const cpu = nds7_group.cpu;
const bus = nds7_group.bus;
while (scheduler.tick < frame_end) {
cpu.step();
if (scheduler.tick >= scheduler.next()) scheduler.handle(bus);
}
}
}
// FIXME: Perf win to allocating on the stack instead?

126
src/core/io.zig
View File

@@ -22,21 +22,8 @@ pub const Io = struct {
/// Caller must cast the `u32` to either `nds7.IntRequest` or `nds9.IntRequest`
irq: u32 = 0x0000_0000,
/// IPC Synchronize
/// Read/Write
ipc_sync: IpcSync = .{ .raw = 0x0000_0000 },
/// IPC Fifo Control
/// Read/Write
ipc_fifo_cnt: IpcFifoCnt = .{ .raw = 0x0000_0000 },
/// IPC Send FIFO
/// Write-Only
ipc_fifo_send: u32 = 0x0000_0000,
/// IPC Receive FIFO
/// Read-Only
ipc_fifo_recv: u32 = 0x0000_0000,
/// Inter Process Communication FIFO
ipc_fifo: IpcFifo = .{},
/// Post Boot Flag
/// Read/Write
@@ -121,6 +108,54 @@ pub inline fn writeToAddressOffset(
};
}
const IpcFifo = struct {
const Sync = IpcSync;
const Control = IpcFifoCnt;
/// IPC Synchronize
/// Read/Write
sync: Sync = .{ .raw = 0x0000_0000 },
/// IPC Fifo Control
/// Read/Write
cnt: Control = .{ .raw = 0x0000_0000 },
fifo: [2]Fifo = .{ Fifo{}, Fifo{} },
const Source = enum { arm7, arm9 };
/// IPC Send FIFO
/// Write-Only
pub fn send(self: *@This(), comptime src: Source, value: u32) !void {
const idx = switch (src) {
.arm7 => 0,
.arm9 => 1,
};
if (!self.cnt.enable_fifos.read()) return;
try self.fifo[idx].push(value);
}
/// IPC Receive FIFO
/// Read-Only
pub fn recv(self: *@This(), comptime src: Source) u32 {
const idx = switch (src) {
.arm7 => 1, // switched around on purpose
.arm9 => 0,
};
const enabled = self.cnt.enable_fifos.read();
const val_opt = if (enabled) self.fifo[idx].pop() else self.fifo[idx].peek();
return val_opt orelse blk: {
self.cnt.send_fifo_empty.set();
break :blk 0x0000_0000;
};
}
};
const IpcSync = extern union {
/// Data input to IPCSYNC Bit 8->11 of remote CPU
/// Read-Only
@@ -187,3 +222,64 @@ pub const nds9 = struct {
pub const PostFlag = enum(u8) { in_progress = 0, completed };
};
const Fifo = struct {
const Index = u8;
const Error = error{full};
const len = 0x10;
read_idx: Index = 0,
write_idx: Index = 0,
buf: [len]u32 = [_]u32{undefined} ** len,
comptime {
const max_capacity = (@as(Index, 1) << @typeInfo(Index).Int.bits - 1) - 1; // half the range of index type
std.debug.assert(std.math.isPowerOfTwo(len));
std.debug.assert(len <= max_capacity);
}
pub fn reset(self: *@This()) void {
self.read_idx = 0;
self.write_idx = 0;
}
pub fn push(self: *@This(), value: u32) Error!void {
if (self.isFull()) return Error.full;
defer self.write_idx += 1;
self.buf[self.mask(self.write_idx)] = value;
}
pub fn pop(self: *@This()) ?u32 {
if (self.isEmpty()) return null;
defer self.read_idx += 1;
return self.buf[self.mask(self.read_idx)];
}
pub fn peek(self: *const @This()) ?u32 {
if (self.isEmpty()) return null;
return self.buf[self.mask(self.read_idx)];
}
fn _len(self: *const @This()) Index {
return self.write_idx - self.read_idx;
}
fn isFull(self: *const @This()) bool {
return self._len() == self.buf.len;
}
fn isEmpty(self: *const @This()) bool {
return self.read_idx == self.write_idx;
}
inline fn mask(self: *const @This(), idx: Index) Index {
const _mask: Index = @intCast(self.buf.len - 1);
return idx & _mask;
}
};

17
src/core/nds7/io.zig
View File

@@ -24,11 +24,13 @@ pub fn read(bus: *const Bus, comptime T: type, address: u32) T {
0x0400_0208 => @intFromBool(bus.io.shared.ime),
0x0400_0210 => bus.io.shared.ie,
0x0400_0214 => bus.io.shared.irq,
0x0410_0000 => bus.io.shared.ipc_fifo.recv(.arm7),
else => warn("unexpected: read(T: {}, addr: 0x{X:0>8}) {} ", .{ T, address, T }),
},
u16 => switch (address) {
0x0400_0180 => @truncate(bus.io.shared.ipc_sync.raw),
0x0400_0184 => @truncate(bus.io.shared.ipc_fifo_cnt.raw),
0x0400_0180 => @truncate(bus.io.shared.ipc_fifo.sync.raw),
0x0400_0184 => @truncate(bus.io.shared.ipc_fifo.cnt.raw),
else => warn("unexpected: read(T: {}, addr: 0x{X:0>8}) {} ", .{ T, address, T }),
},
u8 => switch (address) {
@@ -44,11 +46,18 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
0x0400_0208 => bus.io.shared.ime = value & 1 == 1,
0x0400_0210 => bus.io.shared.ie = value,
0x0400_0214 => bus.io.shared.irq = value,
0x0400_0188 => bus.io.shared.ipc_fifo.send(.arm7, value) catch |e| std.debug.panic("FIFO error: {}", .{e}),
else => log.warn("unexpected: write(T: {}, addr: 0x{X:0>8}, value: 0x{X:0>8})", .{ T, address, value }),
},
u16 => switch (address) {
0x0400_0180 => bus.io.shared.ipc_sync.raw = value,
0x0400_0184 => bus.io.shared.ipc_fifo_cnt.raw = value,
0x0400_0180 => bus.io.shared.ipc_fifo.sync.raw = blk: {
const ret = value & ~@as(u16, 0xF) | (bus.io.shared.ipc_fifo.sync.raw & 0xF);
log.debug("IPCFIFOSYNC <- 0x{X:0>8}", .{ret});
break :blk ret;
},
0x0400_0184 => bus.io.shared.ipc_fifo.cnt.raw = value,
else => log.warn("unexpected: write(T: {}, addr: 0x{X:0>8}, value: 0x{X:0>8})", .{ T, address, value }),
},
u8 => switch (address) {

26
src/core/nds9/io.zig
View File

@@ -31,14 +31,16 @@ pub fn read(bus: *const Bus, comptime T: type, address: u32) T {
0x0400_0208 => @intFromBool(bus.io.shared.ime),
0x0400_0210 => bus.io.shared.ie,
0x0400_0214 => bus.io.shared.irq,
0x0410_0000 => bus.io.shared.ipc_fifo.recv(.arm9),
else => warn("unexpected: read(T: {}, addr: 0x{X:0>8}) {} ", .{ T, address, T }),
},
u16 => switch (address) {
0x0400_0004 => bus.ppu.io.dispstat.raw,
0x0400_0130 => bus.io.keyinput.load(.Monotonic),
0x0400_0180 => @truncate(bus.io.shared.ipc_sync.raw),
0x0400_0184 => @truncate(bus.io.shared.ipc_fifo_cnt.raw),
0x0400_0180 => @truncate(bus.io.shared.ipc_fifo.sync.raw),
0x0400_0184 => @truncate(bus.io.shared.ipc_fifo.cnt.raw),
else => warn("unexpected: read(T: {}, addr: 0x{X:0>8}) {} ", .{ T, address, T }),
},
u8 => switch (address) {
@@ -52,9 +54,14 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
switch (T) {
u32 => switch (address) {
0x0400_0000 => bus.ppu.io.dispcnt_a.raw = value,
0x0400_0180 => bus.io.shared.ipc_sync.raw = value,
0x0400_0184 => bus.io.shared.ipc_fifo_cnt.raw = value,
0x0400_0188 => bus.io.shared.ipc_fifo_send = value,
0x0400_0180 => bus.io.shared.ipc_fifo.sync.raw = blk: {
const ret = value & ~@as(u32, 0xF) | (bus.io.shared.ipc_fifo.sync.raw & 0xF);
log.debug("IPCFIFOSYNC <- 0x{X:0>8}", .{ret});
break :blk ret;
},
0x0400_0184 => bus.io.shared.ipc_fifo.cnt.raw = value,
0x0400_0188 => bus.io.shared.ipc_fifo.send(.arm9, value) catch |e| std.debug.panic("IPC FIFO Error: {}", .{e}),
0x0400_0240 => {
bus.ppu.io.vramcnt_a.raw = @truncate(value >> 0); // 0x0400_0240
@@ -72,8 +79,13 @@ pub fn write(bus: *Bus, comptime T: type, address: u32, value: T) void {
else => log.warn("unexpected: write(T: {}, addr: 0x{X:0>8}, value: 0x{X:0>8})", .{ T, address, value }),
},
u16 => switch (address) {
0x0400_0180 => bus.io.shared.ipc_sync.raw = value,
0x0400_0184 => bus.io.shared.ipc_fifo_cnt.raw = value,
0x0400_0180 => bus.io.shared.ipc_fifo.sync.raw = blk: {
const ret = value & ~@as(u16, 0xF) | (bus.io.shared.ipc_fifo.sync.raw & 0xF);
log.debug("IPCFIFOSYNC <- 0x{X:0>8}", .{ret});
break :blk ret;
},
0x0400_0184 => bus.io.shared.ipc_fifo.cnt.raw = value,
0x0400_0208 => bus.io.shared.ime = value & 1 == 1,
else => log.warn("unexpected: write(T: {}, addr: 0x{X:0>8}, value: 0x{X:0>8})", .{ T, address, value }),