14     include::bindings::bindings::{io_in8, io_out8},
288             io_out8(port + 1, 0x00); // Disable all interrupts  in uart_init()
289             io_out8(port + 3, 0x80); // Enable DLAB (set baud rate divisor)  in uart_init()
293             io_out8(port + 0, (divisor & 0xff) as u8); // Set divisor  (lo byte)  in uart_init()
294             io_out8(port + 1, ((divisor >> 8) & 0xff) as u8); //                  (hi byte)  in uart_init()
295             io_out8(port + 3, 0x03); // 8 bits, no parity, one stop bit  in uart_init()
296             io_out8(port + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold  in uart_init()
297 …io_out8(port + 4, 0x08); // IRQs enabled, RTS/DSR clear (现代计算机上一般都不需要hardware flow control，因此不需要置位…  in uart_init()
298             io_out8(port + 4, 0x1E); // Set in loopback mode, test the serial chip  in uart_init()
299 …io_out8(port + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)  in uart_init()
308             io_out8(port + 4, 0x08);  in uart_init()
348                     io_out8(port, c);  in uart_send()
377         io_out8(port, c);  in c_uart_send()
417         io_out8(port + 1, 0x00); // Disable all interrupts  in c_uart_init()
418         io_out8(port + 3, 0x80); // Enable DLAB (set baud rate divisor)  in c_uart_init()
422         io_out8(port + 0, (divisor & 0xff) as u8); // Set divisor  (lo byte)  in c_uart_init()
423 …     io_out8(port + 1, ((divisor >> 8) & 0xff) as u8); //                  CompatibleTable(hi byte)  in c_uart_init()
424         io_out8(port + 3, 0x03); // 8 bits, no parity, one stop bit  in c_uart_init()
425         io_out8(port + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold  in c_uart_init()
426 …io_out8(port + 4, 0x08); // IRQs enabled, RTS/DSR clear (现代计算机上一般都不需要hardware flow control，因此不需要置位…  in c_uart_init()
427         io_out8(port + 4, 0x1E); // Set in loopback mode, test the serial chip  in c_uart_init()
428 …io_out8(port + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)  in c_uart_init()
437         io_out8(port + 4, 0x08);  in c_uart_init()