52 lines
956 B
C
52 lines
956 B
C
/*-----------------------------------------------------------------------------
|
|
* port.h (by damianf@wpi.edu)
|
|
* Low level I/O functions taken from led-stat.txt
|
|
*
|
|
* Jan 22 95
|
|
*
|
|
* DOS part (tested only with DOS version of GCC, DJGPP)
|
|
* by M.Prinke <m.prinke@trashcan.mcnet.de> 3/97
|
|
*/
|
|
|
|
/* #define DOS */
|
|
|
|
#ifndef PORT_H
|
|
#define PORT_H
|
|
#endif
|
|
|
|
#ifndef DOS
|
|
static inline int
|
|
port_in (int port)
|
|
{
|
|
unsigned char value;
|
|
__asm__ volatile ("inb %1,%0":"=a" (value)
|
|
:"d" ((unsigned short) port));
|
|
return value;
|
|
}
|
|
|
|
static inline void
|
|
port_out (unsigned short int port, unsigned char val)
|
|
{
|
|
__asm__ volatile ("outb %0,%1\n"::"a" (val), "d" (port)
|
|
);
|
|
}
|
|
#else
|
|
#include <pc.h>
|
|
|
|
static inline int
|
|
port_in (int port)
|
|
{
|
|
unsigned char value;
|
|
value = inportb ((unsigned short) port);
|
|
return (int) value;
|
|
}
|
|
|
|
static inline void
|
|
port_out (unsigned int port, unsigned char val)
|
|
{
|
|
outportb ((unsigned short) port, val);
|
|
}
|
|
#endif
|
|
|
|
/**** END OF FILE ****/
|