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style(bus): refactor several hardware abstractions

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This commit is contained in:
Rekai Nyangadzayi Musuka
2022-10-10 10:47:52 -03:00
parent c71e954748
commit 13f6ee8ec4
9 changed files with 266 additions and 258 deletions
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61
src/core/bus/Bios.zig
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@@ -12,6 +12,36 @@ allocator: Allocator,
addr_latch: u32,
pub fn read(self: *Self, comptime T: type, r15: u32, addr: u32) T {
if (r15 < Self.size) {
self.addr_latch = addr;
return self._read(T, addr);
}
log.debug("Rejected read since r15=0x{X:0>8}", .{r15});
return @truncate(T, self._read(T, self.addr_latch + 8));
}
pub fn dbgRead(self: *const Self, comptime T: type, r15: u32, addr: u32) T {
if (r15 < Self.size) return self._read(T, addr);
return @truncate(T, self._read(T, self.addr_latch + 8));
}
/// Read without the GBA safety checks
fn _read(self: *const Self, comptime T: type, addr: u32) T {
const buf = self.buf orelse std.debug.panic("[BIOS] ZBA tried to read {} from 0x{X:0>8} but not BIOS was present", .{ T, addr });
return switch (T) {
u32, u16, u8 => std.mem.readIntSliceLittle(T, buf[addr..][0..@sizeOf(T)]),
else => @compileError("BIOS: Unsupported read width"),
};
}
pub fn write(_: *Self, comptime T: type, addr: u32, value: T) void {
@setCold(true);
log.debug("Tried to write {} 0x{X:} to 0x{X:0>8} ", .{ T, value, addr });
}
pub fn init(allocator: Allocator, maybe_path: ?[]const u8) !Self {
const buf: ?[]u8 = if (maybe_path) |path| blk: {
const file = try std.fs.cwd().openFile(path, .{});
@@ -31,34 +61,3 @@ pub fn deinit(self: *Self) void {
if (self.buf) |buf| self.allocator.free(buf);
self.* = undefined;
}
pub fn read(self: *Self, comptime T: type, r15: u32, addr: u32) T {
if (r15 < Self.size) {
self.addr_latch = addr;
return self.uncheckedRead(T, addr);
}
log.debug("Rejected read since r15=0x{X:0>8}", .{r15});
return @truncate(T, self.uncheckedRead(T, self.addr_latch + 8));
}
pub fn dbgRead(self: *const Self, comptime T: type, r15: u32, addr: u32) T {
if (r15 < Self.size) return self.uncheckedRead(T, addr);
return @truncate(T, self.uncheckedRead(T, self.addr_latch + 8));
}
fn uncheckedRead(self: *const Self, comptime T: type, addr: u32) T {
if (self.buf) |buf| {
return switch (T) {
u32, u16, u8 => std.mem.readIntSliceLittle(T, buf[addr..][0..@sizeOf(T)]),
else => @compileError("BIOS: Unsupported read width"),
};
}
std.debug.panic("[BIOS] ZBA tried to read {} from 0x{X:0>8} but not BIOS was present", .{ T, addr });
}
pub fn write(_: *Self, comptime T: type, addr: u32, value: T) void {
@setCold(true);
log.debug("Tried to write {} 0x{X:} to 0x{X:0>8} ", .{ T, value, addr });
}