irq.h

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/*
 * (c) 2003-2009 Author(s)
 *     economic rights: Technische Universität Dresden (Germany)
 * This file is part of TUD:OS and distributed under the terms of the
 * GNU Lesser General Public License 2.1.
 * Please see the COPYING-LGPL-2.1 file for details.
 */
 
#ifndef __L4_IRQ_H__ 
#define __L4_IRQ_H__ 
 
#include <l4/sys/compiler.h>
#include <l4/util/port_io.h>
 
EXTERN_C_BEGIN
 
L4_INLINE void
l4util_irq_acknowledge(unsigned int irq);
 
static inline void
l4util_cli (void)
{
  __asm__ __volatile__ ("cli" : : : "memory");
}
 
static inline void
l4util_sti (void)
{
  __asm__ __volatile__ ("sti" : : : "memory");
}
 
static inline void
l4util_flags_save (l4_umword_t *flags)
{
  __asm__ __volatile__ ("pushfl ; popl %0 " :"=g" (*flags) : :"memory");
}
 
static inline void
l4util_flags_restore (l4_umword_t *flags)
{
  __asm__ __volatile__ ("pushl %0 ; popfl" : :"g" (*flags) : "memory");
}
 
L4_INLINE void
l4util_irq_acknowledge(unsigned int irq)
{
  if (irq > 7)
    {
      l4util_out8(0x60+(irq & 7), 0xA0);
      l4util_out8(0x0B,0xA0);
      if (l4util_in8(0xA0) == 0)
  l4util_out8(0x60 + 2, 0x20);
    } 
  else
    l4util_out8(0x60+irq, 0x20);     /* acknowledge the irq */
};
 
EXTERN_C_END
 
#endif