sys_portio.c

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/* ports I/O functions */

#include "../fb.h"
#include "../unix/fb_private_console.h"

int fb_hIn( unsigned short port )
{
#if defined HOST_X86 || defined HOST_X86_64
        unsigned char value;
        if (!__fb_con.has_perm)
                return -fb_ErrorSetNum( FB_RTERROR_NOPRIVILEDGES );
        __asm__ volatile ("inb %1, %0" : "=a" (value) : "d" (port));
        return (int)value;
#else
        return -fb_ErrorSetNum( FB_RTERROR_ILLEGALFUNCTIONCALL );
#endif
}

int fb_hOut( unsigned short port, unsigned char value )
{
#if defined HOST_X86 || defined HOST_X86_64
        if (!__fb_con.has_perm)
                return fb_ErrorSetNum( FB_RTERROR_NOPRIVILEDGES );
        __asm__ volatile ("outb %0, %1" : : "a" (value), "d" (port));
        return FB_RTERROR_OK;
#else
        return fb_ErrorSetNum( FB_RTERROR_ILLEGALFUNCTIONCALL );
#endif
}