const fmt = @import("std").fmt;
const Writer = @import("std").io.Writer;

fn inb(port: u16) u8 {
    return asm volatile ("inb %[port], %[result]"
        : [result] "={al}" (-> u8),
        : [port] "{dx}" (port),
    );
}

fn outb(port: u16, data: u8) void {
    asm volatile ("outb %[data], %[port]"
        :
        : [port] "{dx}" (port),
          [data] "{al}" (data),
    );
}

pub fn write(data: []const u8) void {
    for (data) |x| {
        outb(0xe9, x);
    }
}

pub const writer = Writer(void, error{}, callback){ .context = {} };

fn callback(_: void, string: []const u8) error{}!usize {
    write(string);
    return string.len;
}

pub fn printf(comptime format: []const u8, args: anytype) void {
    fmt.format(writer, format, args) catch unreachable;
}