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[serial] Add general abstraction of a 16550-compatible UART

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2015-06-29 08:39:58 +01:00
parent edf74df4ab
commit 611c9e39da
6 changed files with 371 additions and 0 deletions
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41
src/arch/x86/include/bits/uart.h Normal file
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#ifndef _BITS_UART_H
#define _BITS_UART_H
/** @file
*
* 16550-compatible UART
*
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <stdint.h>
#include <ipxe/io.h>
/**
* Write to UART register
*
* @v uart UART
* @v addr Register address
* @v data Data
*/
static inline __attribute__ (( always_inline )) void
uart_write ( struct uart *uart, unsigned int addr, uint8_t data ) {
outb ( data, ( uart->base + addr ) );
}
/**
* Read from UART register
*
* @v uart UART
* @v addr Register address
* @ret data Data
*/
static inline __attribute__ (( always_inline )) uint8_t
uart_read ( struct uart *uart, unsigned int addr ) {
return inb ( uart->base + addr );
}
extern int uart_select ( struct uart *uart, unsigned int port );
#endif /* _BITS_UART_H */