lib/i386-io-djgpp.h

/*
 *	The PCI Library -- Access to i386 I/O ports on DJGPP
 *
 *	Copyright (c) 2010, 2017 Rudolf Marek <r.marek@assembler.cz>
 *
 *	Can be freely distributed and used under the terms of the GNU GPL v2+
 *
 *	SPDX-License-Identifier: GPL-2.0-or-later
 */

#include <dos.h>

#include "i386-io-access.h"

static int irq_enabled;

static int
intel_setup_io(struct pci_access *a UNUSED)
{
  return 1;
}

static inline void
intel_cleanup_io(struct pci_access *a UNUSED)
{
}

static inline void intel_io_lock(void)
{
  asm volatile("" : : : "memory");
  irq_enabled = disable();
}

static inline void intel_io_unlock(void)
{
  asm volatile("" : : : "memory");
  if (irq_enabled) {
    enable();
  }
}