76     port: UartPort,  field
82         Self {port: UartPort::COM1, baud_rate: 115200}  in default()
94         let port = uart_port.to_u16();  in uart_init()  localVariable
101             io_out8(port + 1, 0x00); // Disable all interrupts  in uart_init()
102             io_out8(port + 3, 0x80); // Enable DLAB (set baud rate divisor)  in uart_init()
106             io_out8(port + 0, (divisor & 0xff) as u8);        // Set divisor  (lo byte)  in uart_init()
107             io_out8(port + 1, ((divisor >> 8) & 0xff) as u8); //                  (hi byte)  in uart_init()
108             io_out8(port + 3, 0x03);                  // 8 bits, no parity, one stop bit  in uart_init()
109 …       io_out8(port + 2, 0xC7);                  // Enable FIFO, clear them, with 14-byte threshold  in uart_init()
110 …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()
111             io_out8(port + 4, 0x1E); // Set in loopback mode, test the serial chip  in uart_init()
112 …io_out8(port + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)  in uart_init()
115             if io_in8(port + 0) != 0xAE {  in uart_init()
121             io_out8(port + 4, 0x08);  in uart_init()
157         let port = uart_port.to_u16();  in uart_send()  localVariable
158         while UartDriver::is_transmit_empty(port) == false {  in uart_send()
160                 unsafe { io_out8(port, c); }  in uart_send()
170         let port = uart_port.to_u16();  in uart_read_byte()  localVariable
171         while UartDriver::serial_received(port) == false {} //TODO:pause  in uart_read_byte()
172         unsafe { io_in8(port) as char }  in uart_read_byte()
181 pub extern "C" fn c_uart_send(port: u16, c: u8) {  in c_uart_send()
182     while UartDriver::is_transmit_empty(port) == false {} //TODO:pause  in c_uart_send()
183     unsafe { io_out8(port, c); }  in c_uart_send()
190 pub extern "C" fn c_uart_read(port: u16) -> u8 {  in c_uart_read()
191     while UartDriver::serial_received(port) == false {} //TODO:pause  in c_uart_read()
192     unsafe { io_in8(port) }  in c_uart_read()
199 pub extern "C" fn c_uart_send_str(port: u16, str: *const u8)  in c_uart_send_str()
204             c_uart_send(port, *offset(str, i));  in c_uart_send_str()
215 pub extern "C" fn c_uart_init(port: u16, baud_rate: u32) -> i32 {  in c_uart_init()
223         io_out8(port + 1, 0x00); // Disable all interrupts  in c_uart_init()
224         io_out8(port + 3, 0x80); // Enable DLAB (set baud rate divisor)  in c_uart_init()
228         io_out8(port + 0, (divisor & 0xff) as u8);        // Set divisor  (lo byte)  in c_uart_init()
229         io_out8(port + 1, ((divisor >> 8) & 0xff) as u8); //                  (hi byte)  in c_uart_init()
230         io_out8(port + 3, 0x03);                  // 8 bits, no parity, one stop bit  in c_uart_init()
231         io_out8(port + 2, 0xC7);                  // Enable FIFO, clear them, with 14-byte threshold  in c_uart_init()
232 …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()
233         io_out8(port + 4, 0x1E); // Set in loopback mode, test the serial chip  in c_uart_init()
234 …io_out8(port + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)  in c_uart_init()
237         if io_in8(port + 0) != 0xAE {  in c_uart_init()
243         io_out8(port + 4, 0x08);  in c_uart_init()
246             c_uart_send(port, *c);  in c_uart_init()