ppokorny
e7316389e8
serial port side. Also fixed problems with ioperm on the parallel port side. Added --waittime option to the server to specify how long the server should leave a screen up before changing to the next screen.
86 lines
1.5 KiB
C
86 lines
1.5 KiB
C
#ifndef PORT_H
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#define PORT_H
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/*-----------------------------------------------------------------------------
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* port.h (by damianf@wpi.edu)
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* Low level I/O functions taken from led-stat.txt
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*
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* Jan 22 95
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*
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* DOS part (tested only with DOS version of GCC, DJGPP)
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* by M.Prinke <m.prinke@trashcan.mcnet.de> 3/97
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*/
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/* #define DOS */
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#ifndef DOS
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static inline int
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port_in (int port)
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{
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unsigned char value;
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__asm__ volatile ("inb %1,%0":"=a" (value)
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:"d" ((unsigned short) port));
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return value;
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}
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static inline void
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port_out (unsigned short int port, unsigned char val)
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{
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__asm__ volatile ("outb %0,%1\n"::"a" (val), "d" (port)
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);
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}
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/***
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*** Get access to a specific port
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***/
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#ifdef HAVE_IOPERM
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/* Assume this is a LINUX system with ioperm */
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#include <sys/io.h>
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static inline int
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port_access (unsigned short int port)
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{
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return ioperm( port, 1, 255);
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}
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#else
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/* Assume this is a BSD system */
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#include <stdio.h>
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FILE * port_access_handle = NULL ;
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static inline int
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port_access (unsigned short int port)
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{
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if( port_access_handle
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|| (port_access_handle = fopen("/dev/io", "rw")) != NULL ) {
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return( 0 ); /* Success */
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} else {
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return( -1 ); /* Failure */
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};
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}
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#endif
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#else
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#include <pc.h>
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static inline int
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port_in (int port)
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{
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unsigned char value;
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value = inportb ((unsigned short) port);
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return (int) value;
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}
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static inline void
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port_out (unsigned int port, unsigned char val)
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{
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outportb ((unsigned short) port, val);
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}
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#endif
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/**** END OF FILE ****/
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#endif
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