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port_io.h

Go to the documentation of this file.

/* $Id: port_io.h 13646 2004-02-12 16:21:30Z fm3 $ */
/*****************************************************************************/
/*****************************************************************************/

/* (c) 2003 Technische Universitaet Dresden
 * This file is part of DROPS, which is distributed under the terms of the
 * GNU General Public License 2. Please see the COPYING file for details. */

#ifndef _L4UTIL_PORT_IO_H
#define _L4UTIL_PORT_IO_H

/* L4 includes */
#include <l4/sys/l4int.h>
#include <l4/sys/compiler.h>

/*****************************************************************************
 *** Prototypes
 *****************************************************************************/

EXTERN_C_BEGIN

L4_INLINE l4_uint8_t
l4util_in8(l4_uint16_t port);

L4_INLINE l4_uint16_t
l4util_in16(l4_uint16_t port);

L4_INLINE l4_uint32_t
l4util_in32(l4_uint16_t port);

L4_INLINE void
l4util_ins8(l4_uint16_t port, l4_umword_t addr, l4_umword_t count);

L4_INLINE void
l4util_ins16(l4_uint16_t port, l4_umword_t addr, l4_umword_t count);

L4_INLINE void
l4util_ins32(l4_uint16_t port, l4_umword_t addr, l4_umword_t count);

L4_INLINE void
l4util_out8(l4_uint8_t value, l4_uint16_t port);

L4_INLINE void
l4util_out16(l4_uint16_t value, l4_uint16_t port);

L4_INLINE void
l4util_out32(l4_uint32_t value, l4_uint16_t port);

L4_INLINE void
l4util_iodelay(void);

EXTERN_C_END


/*****************************************************************************
 *** Implementation
 *****************************************************************************/

L4_INLINE l4_uint8_t
l4util_in8(l4_uint16_t port)
{
  l4_uint8_t value;
  asm volatile ("inb %w1, %b0" : "=a" (value) : "Nd" (port));
  return value;
}

L4_INLINE l4_uint16_t
l4util_in16(l4_uint16_t port)
{
  l4_uint16_t value;
  asm volatile ("inw %w1, %w0" : "=a" (value) : "Nd" (port));
  return value;
}

L4_INLINE l4_uint32_t
l4util_in32(l4_uint16_t port)
{
  l4_uint32_t value;
  asm volatile ("inl %w1, %0" : "=a" (value) : "Nd" (port));
  return value;
}

L4_INLINE void
l4util_ins8(l4_uint16_t port, l4_umword_t addr, l4_umword_t count)
{
  l4_umword_t dummy1, dummy2;
  asm volatile ("rep insb" : "=D"(dummy1), "=c"(dummy2)
                           : "d" (port), "D" (addr), "c"(count)
                           : "memory");
}

L4_INLINE void
l4util_ins16(l4_uint16_t port, l4_umword_t addr, l4_umword_t count)
{
  l4_umword_t dummy1, dummy2;
  asm volatile ("rep insw" : "=D"(dummy1), "=c"(dummy2)
                           : "d" (port), "D" (addr), "c"(count)
                           : "memory");
}

L4_INLINE void
l4util_ins32(l4_uint16_t port, l4_umword_t addr, l4_umword_t count)
{
  l4_umword_t dummy1, dummy2;
  asm volatile ("rep insl" : "=D"(dummy1), "=c"(dummy2)
                           : "d" (port), "D" (addr), "c"(count)
                           : "memory");
}

L4_INLINE void
l4util_out8(l4_uint8_t value, l4_uint16_t port)
{
  asm volatile ("outb %b0, %w1" : : "a" (value), "Nd" (port));
}

L4_INLINE void
l4util_out16(l4_uint16_t value, l4_uint16_t port)
{
  asm volatile ("outw %w0, %w1" : : "a" (value), "Nd" (port));
}

L4_INLINE void
l4util_out32(l4_uint32_t value, l4_uint16_t port)
{
  asm volatile ("outl %0, %w1" : : "a" (value), "Nd" (port));
}

L4_INLINE void
l4util_iodelay(void)
{
  asm volatile ("outb %al,$0x80");
}

#endif

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