76     port: UartPort,  field
83             port: UartPort::COM1,  in default()
97         let port = uart_port.to_u16();  in uart_init()  localVariable
104             io_out8(port + 1, 0x00); // Disable all interrupts  in uart_init()
105             io_out8(port + 3, 0x80); // Enable DLAB (set baud rate divisor)  in uart_init()
109             io_out8(port + 0, (divisor & 0xff) as u8); // Set divisor  (lo byte)  in uart_init()
110             io_out8(port + 1, ((divisor >> 8) & 0xff) as u8); //                  (hi byte)  in uart_init()
111             io_out8(port + 3, 0x03); // 8 bits, no parity, one stop bit  in uart_init()
112             io_out8(port + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold  in uart_init()
113 …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()
114             io_out8(port + 4, 0x1E); // Set in loopback mode, test the serial chip  in uart_init()
115 …io_out8(port + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)  in uart_init()
118             if io_in8(port + 0) != 0xAE {  in uart_init()
124             io_out8(port + 4, 0x08);  in uart_init()
160         let port = uart_port.to_u16();  in uart_send()  localVariable
161         while UartDriver::is_transmit_empty(port) == false {  in uart_send()
164                     io_out8(port, c);  in uart_send()
175         let port = uart_port.to_u16();  in uart_read_byte()  localVariable
176         while UartDriver::serial_received(port) == false {} //TODO:pause  in uart_read_byte()
177         unsafe { io_in8(port) as char }  in uart_read_byte()
185 pub extern "C" fn c_uart_send(port: u16, c: u8) {  in c_uart_send()
186     while UartDriver::is_transmit_empty(port) == false {} //TODO:pause  in c_uart_send()
188         io_out8(port, c);  in c_uart_send()
196 pub extern "C" fn c_uart_read(port: u16) -> u8 {  in c_uart_read()
197     while UartDriver::serial_received(port) == false {} //TODO:pause  in c_uart_read()
198     unsafe { io_in8(port) }  in c_uart_read()
205 pub extern "C" fn c_uart_send_str(port: u16, str: *const u8) {  in c_uart_send_str()
209             c_uart_send(port, *offset(str, i));  in c_uart_send_str()
220 pub extern "C" fn c_uart_init(port: u16, baud_rate: u32) -> i32 {  in c_uart_init()
228         io_out8(port + 1, 0x00); // Disable all interrupts  in c_uart_init()
229         io_out8(port + 3, 0x80); // Enable DLAB (set baud rate divisor)  in c_uart_init()
233         io_out8(port + 0, (divisor & 0xff) as u8); // Set divisor  (lo byte)  in c_uart_init()
234         io_out8(port + 1, ((divisor >> 8) & 0xff) as u8); //                  (hi byte)  in c_uart_init()
235         io_out8(port + 3, 0x03); // 8 bits, no parity, one stop bit  in c_uart_init()
236         io_out8(port + 2, 0xC7); // Enable FIFO, clear them, with 14-byte threshold  in c_uart_init()
237 …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()
238         io_out8(port + 4, 0x1E); // Set in loopback mode, test the serial chip  in c_uart_init()
239 …io_out8(port + 0, 0xAE); // Test serial chip (send byte 0xAE and check if serial returns same byte)  in c_uart_init()
242         if io_in8(port + 0) != 0xAE {  in c_uart_init()
248         io_out8(port + 4, 0x08);  in c_uart_init()
251             c_uart_send(port, *c);  in c_uart_init()