port.c

Go to the documentation of this file.

#include <sys/io.h>
#include <errno.h>

void outdw(unsigned short port, unsigned long dword)
{
        asm __volatile__ (
                "out %%eax, %%dx"
                : /* Output */
                : "d"(port), "a"(dword) /* Input */
                /* : Clobber list */
        );
}

void outw(unsigned short port, unsigned short word)
{
        asm __volatile__ (
                "out %%ax, %%dx"
                : /* Output */
                : "d"(port), "a"(word) /* Input */
                /* : Clobber list */
        );
}

void outb(unsigned short port, unsigned char byte)
{
        asm __volatile__ (
                "out %%al, %%dx"
                : /* Output */
                : "d"(port), "a"(byte) /* Input */
                /* : Clobber list */
        );
}

unsigned long indw(unsigned short port)
{
        unsigned long dword;
        asm __volatile__ (
                "in %%dx, %%eax"
                : "=a"(dword) /* Output */
                : "d"(port) /* Input */
                /* : Clobber list */
        );

        return dword;
}

unsigned short inw(unsigned short port)
{
        unsigned short word;
        asm __volatile__ (
                "in %%dx, %%ax"
                : "=a"(word) /* Output */
                : "d"(port) /* Input */
                /* : Clobber list */
        );

        return word;
}

unsigned char inb(unsigned short port)
{
        unsigned char byte;
        asm __volatile__ (
                "in %%dx, %%al"
                : "=a"(byte) /* Output */
                : "d"(port) /* Input */
                /* : Clobber list */
        );

        return byte;
}

int ioperm(unsigned long from, unsigned long num, int turn_on)
{
        return -EFAULT;
}

int iopl(int level)
{
        return -EFAULT;
}

/* End of a file */