1 files changed, 40 insertions, 0 deletions
diff --git a/lib/i386-io-djgpp.h b/lib/i386-io-djgpp.h
new file mode 100644
index 0000000..1afb00e
--- /dev/null
+++ b/lib/i386-io-djgpp.h
@@ -0,0 +1,40 @@
+/*
+ *	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();
+  }
+}