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chore(bios): impl bios handlers

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This commit is contained in:
Rekai Nyangadzayi Musuka
2023-10-30 21:57:34 -05:00
parent 95dfeceb00
commit 1a56a1a285
5 changed files with 113 additions and 25 deletions
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4
src/core/emu.zig
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@@ -75,7 +75,7 @@ pub fn loadFirm(allocator: Allocator, system: System, firm_path: []const u8) !vo
const buf = try file.readToEndAlloc(allocator, try file.getEndPos());
defer allocator.free(buf);
@memcpy(system.bus7.bios[0..buf.len], buf);
try system.bus7.bios.load(allocator, buf);
}
{ // NDS9 BIOS
@@ -90,7 +90,7 @@ pub fn loadFirm(allocator: Allocator, system: System, firm_path: []const u8) !vo
const buf = try file.readToEndAlloc(allocator, try file.getEndPos());
defer allocator.free(buf);
@memcpy(system.bus9.bios[0..buf.len], buf);
try system.bus9.bios.load(allocator, buf);
}
}

47
src/core/nds7/Bios.zig Normal file
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@@ -0,0 +1,47 @@
const std = @import("std");
const Allocator = std.mem.Allocator;
const log = std.log.scoped(.nds7_bios);
const KiB = 0x400;
const len = 16 * KiB;
buf: ?*align(4) [len]u8 = null,
// FIXME: Currently we dupe here, should we just take ownership?
pub fn load(self: *@This(), allocator: Allocator, data: []u8) !void {
if (data.len != len) {
const acutal_size = @as(f32, @floatFromInt(data.len)) / KiB;
log.warn("BIOS was {d:.2} KiB (should be {} KiB)", .{ acutal_size, len });
}
const buf = try allocator.alignedAlloc(u8, 4, len);
@memset(buf, 0);
@memcpy(buf[0..data.len], data);
self.* = .{ .buf = buf[0..len] };
}
pub fn deinit(self: @This(), allocator: Allocator) void {
if (self.buf) |ptr| allocator.destroy(ptr);
}
// Note: Parts of 16MiB addrspace that aren't mapped to BIOS are typically undefined
pub fn read(self: *const @This(), comptime T: type, address: u32) T {
const readInt = std.mem.readIntLittle;
const byte_count = @divExact(@typeInfo(T).Int.bits, 8);
// if (address >= len) return 0x0000_0000; // TODO: What is undefined actually?
const ptr = self.buf orelse {
log.err("read(T: {}, address: 0x{X:0>8}) from BIOS but none was found!", .{ T, address });
@panic("TODO: ability to load in NDS7 BIOS just-in-time");
};
return readInt(T, ptr[address & (len - 1) ..][0..byte_count]);
}
pub fn write(_: *const @This(), comptime T: type, address: u32, value: T) void {
log.err("write(T: {}, address: 0x{X:0>8}, value: 0x{X:}) but we're in the BIOS!", .{ T, address, value });
}

18
src/core/nds7/Bus.zig
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@@ -5,6 +5,7 @@ const Scheduler = @import("../Scheduler.zig");
const SharedCtx = @import("../emu.zig").SharedCtx;
const Wram = @import("../emu.zig").Wram;
const Vram = @import("../ppu.zig").Vram;
const Bios = @import("Bios.zig");
const forceAlign = @import("../emu.zig").forceAlign;
const Allocator = std.mem.Allocator;
@@ -20,18 +21,13 @@ main: *[4 * MiB]u8,
shr_wram: *Wram,
wram: *[64 * KiB]u8,
vram: *Vram,
io: io.Io,
bios: *[16 * KiB]u8,
io: io.Io,
bios: Bios,
pub fn init(allocator: Allocator, scheduler: *Scheduler, ctx: SharedCtx) !@This() {
const wram = try allocator.create([64 * KiB]u8);
@memset(wram, 0);
errdefer allocator.destroy(wram);
const bios = try allocator.create([16 * KiB]u8);
@memset(bios, 0);
errdefer allocator.destroy(bios);
return .{
.main = ctx.main,
@@ -41,13 +37,13 @@ pub fn init(allocator: Allocator, scheduler: *Scheduler, ctx: SharedCtx) !@This(
.scheduler = scheduler,
.io = io.Io.init(ctx.io),
.bios = bios,
.bios = .{},
};
}
pub fn deinit(self: *@This(), allocator: Allocator) void {
allocator.destroy(self.wram);
allocator.destroy(self.bios);
self.bios.deinit(allocator);
}
pub fn reset(_: *@This()) void {}
@@ -73,7 +69,7 @@ fn _read(self: *@This(), comptime T: type, comptime mode: Mode, address: u32) T
}
return switch (aligned_addr) {
0x0000_0000...0x01FF_FFFF => readInt(T, self.bios[address & 0x3FFF ..][0..byte_count]),
0x0000_0000...0x01FF_FFFF => self.bios.read(T, address),
0x0200_0000...0x02FF_FFFF => readInt(T, self.main[aligned_addr & 0x003F_FFFF ..][0..byte_count]),
0x0300_0000...0x037F_FFFF => switch (self.io.shr.wramcnt.mode.read()) {
0b00 => readInt(T, self.wram[aligned_addr & 0x0000_FFFF ..][0..byte_count]),
@@ -107,7 +103,7 @@ fn _write(self: *@This(), comptime T: type, comptime mode: Mode, address: u32, v
}
switch (aligned_addr) {
0x0000_0000...0x01FF_FFFF => log.err("tried to read from NDS7 BIOS: 0x{X:0>8}", .{aligned_addr}),
0x0000_0000...0x01FF_FFFF => self.bios.write(T, address, value),
0x0200_0000...0x02FF_FFFF => writeInt(T, self.main[aligned_addr & 0x003F_FFFF ..][0..byte_count], value),
0x0300_0000...0x037F_FFFF => switch (self.io.shr.wramcnt.mode.read()) {
0b00 => writeInt(T, self.wram[aligned_addr & 0x0000_FFFF ..][0..byte_count], value),

49
src/core/nds9/Bios.zig Normal file
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@@ -0,0 +1,49 @@
const std = @import("std");
const Allocator = std.mem.Allocator;
const log = std.log.scoped(.nds7_bios);
const KiB = 0x400;
const _len = 4 * KiB; // real size of the NDS9 BIOS
const len = 32 * KiB; // size allocated to NDS9 BIOS
buf: ?*align(4) [len]u8 = null,
// FIXME: Currently we dupe here, should we just take ownership?
pub fn load(self: *@This(), allocator: Allocator, data: []u8) !void {
if (data.len != _len) {
const acutal_size = @as(f32, @floatFromInt(data.len)) / KiB;
log.warn("BIOS was {d:.2} KiB (should be {} KiB)", .{ acutal_size, len });
}
const buf = try allocator.alignedAlloc(u8, 4, len);
@memcpy(buf[0..data.len], data);
@memset(buf[data.len..], 0);
self.* = .{ .buf = buf[0..len] };
}
pub fn deinit(self: @This(), allocator: Allocator) void {
if (self.buf) |ptr| allocator.destroy(ptr);
}
// Note: Parts of 16MiB addrspace that aren't mapped to BIOS are typically undefined
pub fn read(self: *const @This(), comptime T: type, address: u32) T {
const readInt = std.mem.readIntLittle;
const byte_count = @divExact(@typeInfo(T).Int.bits, 8);
// if (address >= len) return 0x0000_0000; // TODO: What is undefined actually?
const ptr = self.buf orelse {
log.err("read(T: {}, address: 0x{X:0>8}) from BIOS but none was found!", .{ T, address });
@panic("TODO: ability to load in NDS9 BIOS just-in-time");
};
return readInt(T, ptr[address & (len - 1) ..][0..byte_count]);
}
pub fn write(_: *const @This(), comptime T: type, address: u32, value: T) void {
log.err("write(T: {}, address: 0x{X:0>8}, value: 0x{X:}) but we're in the BIOS!", .{ T, address, value });
}

20
src/core/nds9/Bus.zig
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@@ -5,6 +5,7 @@ const Ppu = @import("../ppu.zig").Ppu;
const Scheduler = @import("../Scheduler.zig");
const SharedCtx = @import("../emu.zig").SharedCtx;
const Wram = @import("../emu.zig").Wram;
const Bios = @import("Bios.zig");
const forceAlign = @import("../emu.zig").forceAlign;
const Allocator = std.mem.Allocator;
@@ -17,21 +18,16 @@ const log = std.log.scoped(.nds9_bus);
main: *[4 * MiB]u8,
wram: *Wram,
scheduler: *Scheduler,
io: io.Io,
ppu: Ppu,
bios: *[32 * KiB]u8,
scheduler: *Scheduler,
bios: Bios,
pub fn init(allocator: Allocator, scheduler: *Scheduler, ctx: SharedCtx) !@This() {
const dots_per_cycle = 3; // ARM946E-S runs twice as fast as the ARM7TDMI
scheduler.push(.{ .nds9 = .draw }, 256 * dots_per_cycle);
const bios = try allocator.create([32 * KiB]u8);
@memset(bios, 0);
errdefer allocator.destroy(bios);
return .{
.main = ctx.main,
.wram = ctx.wram,
@@ -39,13 +35,13 @@ pub fn init(allocator: Allocator, scheduler: *Scheduler, ctx: SharedCtx) !@This(
.scheduler = scheduler,
.io = io.Io.init(ctx.io),
.bios = bios,
.bios = .{},
};
}
pub fn deinit(self: *@This(), allocator: Allocator) void {
self.ppu.deinit(allocator);
allocator.destroy(self.bios);
self.bios.deinit(allocator);
}
pub fn reset(_: *@This()) void {
@@ -77,7 +73,7 @@ fn _read(self: *@This(), comptime T: type, comptime mode: Mode, address: u32) T
0x0300_0000...0x03FF_FFFF => self.wram.read(T, .nds9, aligned_addr),
0x0400_0000...0x04FF_FFFF => io.read(self, T, aligned_addr),
0x0600_0000...0x06FF_FFFF => self.ppu.vram.read(T, .nds9, aligned_addr),
0xFFFF_0000...0xFFFF_FFFF => readInt(T, self.bios[address & 0x0000_7FFF ..][0..byte_count]),
0xFFFF_0000...0xFFFF_FFFF => self.bios.read(T, address),
else => warn("unexpected read: 0x{x:0>8} -> {}", .{ aligned_addr, T }),
};
}
@@ -107,7 +103,7 @@ fn _write(self: *@This(), comptime T: type, comptime mode: Mode, address: u32, v
0x0300_0000...0x03FF_FFFF => self.wram.write(T, .nds9, aligned_addr, value),
0x0400_0000...0x04FF_FFFF => io.write(self, T, aligned_addr, value),
0x0600_0000...0x06FF_FFFF => self.ppu.vram.write(T, .nds9, aligned_addr, value),
0xFFFF_0000...0xFFFF_FFFF => log.err("tried to read from NDS9 BIOS: 0x{X:0>8}", .{aligned_addr}),
0xFFFF_0000...0xFFFF_FFFF => self.bios.write(T, address, value),
else => log.warn("unexpected write: 0x{X:}{} -> 0x{X:0>8}", .{ value, T, aligned_addr }),
}
}