uart.h File Reference

16550-compatible UART More...

#include <stdint.h>
#include <ipxe/io.h>

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
static	__attribute__ ((always_inline)) void uart_write(struct uart *uart
	Write to UART register. More...
int	uart_select (struct uart *uart, unsigned int port)
	Select UART port. More...

Variables
static unsigned int	addr
static unsigned int uint8_t	data

Detailed Description

16550-compatible UART

Definition in file uart.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

__attribute__()

static __attribute__ ( (always_inline)  )

inlinestatic

Write to UART register.

Read from UART register.

Parameters

uart	UART
addr	Register address
data	Data
uart	UART
addr	Register address

Return values

data

Data

uart_select()

int uart_select	(	struct uart *	uart,
		unsigned int	port
	)

Select UART port.

Parameters

uart	UART
port	Port number, or 0 to disable

Return values

rc	Return status code

Definition at line 50 of file x86_uart.c.

                                                         {
        int rc;

        /* Set new UART base */
        if ( port >= ( sizeof ( uart_base ) / sizeof ( uart_base[0] ) ) ) {
                rc = -ENODEV;
                goto err;
        }
        uart->base = ( ( void * ) ( intptr_t ) uart_base[port] );

        /* Check that UART exists */
        if ( ( rc = uart_exists ( uart ) ) != 0 )
                goto err;

        return 0;

 err:
        uart->base = NULL;
        return rc;
}

Variable Documentation

addr

unsigned int addr

Initial value:

{
        return inb ( uart->base + addr )

Definition at line 23 of file uart.h.

data

unsigned int uint8_t data

Initial value:

{
        outb ( data, ( uart->base + addr ) )

Definition at line 23 of file uart.h.