Initial source

1 files changed, 79 insertions, 0 deletions

diff --git a/i386/i386at/gpl/linux/linux_port.c b/i386/i386at/gpl/linux/linux_port.c
new file mode 100644
index 00000000..4a79c499
--- /dev/null
+++ b/i386/i386at/gpl/linux/linux_port.c
@@ -0,0 +1,79 @@
+/*
+ * Linux I/O port management.
+ * Copyright (C) 1995 Shantanu Goel.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/ioport.h>
+
+#define NPORTS		65536
+#define BITS_PER_WORD	32
+#define NWORDS		(NPORTS / BITS_PER_WORD)
+
+/*
+ * This bitmap keeps track of all allocated ports.
+ * A bit is set if the port has been allocated.
+ */
+static unsigned port_bitmap[NWORDS];
+
+void snarf_region(unsigned, unsigned);
+
+/*
+ * Check if a region is available for use.
+ */
+int
+check_region(unsigned port, unsigned size)
+{
+	unsigned i;
+
+	for (i = port; i < port + size; i++)
+		if (port_bitmap[i/BITS_PER_WORD] & (1 << (i%BITS_PER_WORD)))
+			return (1);
+	return (0);
+}
+
+/*
+ * Allocate a region.
+ */
+void
+request_region(unsigned port, unsigned size, const char *name)
+{
+	unsigned i;
+
+	for (i = port; i < port + size; i++)
+		port_bitmap[i / BITS_PER_WORD] |= 1 << (i % BITS_PER_WORD);
+}
+
+/*
+ * For compatibility with older kernels.
+ */
+void
+snarf_region(unsigned port, unsigned size)
+{
+	request_region(port, size, 0);
+}
+
+/*
+ * Deallocate a region.
+ */
+void
+release_region(unsigned port, unsigned size)
+{
+	unsigned i;
+
+	for (i = port; i < port + size; i++)
+		port_bitmap[i / BITS_PER_WORD] &= ~(1 << (i % BITS_PER_WORD));
+}