[PATCH 09/10] AXFS: axfs_uml.c

[Jared Hulbert <jaredeh@gmail.com>]

UML specific code for working with iomem 'devices'.  UML is handy for testing.

Signed-off-by: Jared Hulbert <jaredeh@gmail.com>
---
diff --git a/fs/axfs/axfs_uml.c b/fs/axfs/axfs_uml.c
new file mode 100644
index 0000000..7d479a0
--- /dev/null
+++ b/fs/axfs/axfs_uml.c
@@ -0,0 +1,47 @@
+/*
+ * Advanced XIP File System for Linux - AXFS
+ *   Readonly, compressed, and XIP filesystem for Linux systems big and small
+ *
+ * Copyright(c) 2008 Numonyx
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * Authors:
+ *  Jared Hulbert <jaredeh@gmail.com>
+ *
+ * Project url: http://axfs.sourceforge.net
+ *
+ * axfs_uml.c -
+ *   Allows axfs to a UML kernels find_iomem() interface as an XIP device or
+ *   dummy functions if this is not a UML build.
+ */
+
+#include <linux/axfs.h>
+#ifdef CONFIG_UML
+#include <mem_user.h>
+int axfs_get_uml_address(char *iomem, unsigned long *address,
+			 unsigned long *length)
+{
+	*address = find_iomem(iomem, length);
+	if (!(*address)) {
+		printk(KERN_DEBUG "axfs: find_iomem() failed\n");
+		return -EINVAL;
+	}
+
+	if (*length < PAGE_SIZE) {
+		printk(KERN_DEBUG
+		       "axfs: iomem() too small, must be at least %li Bytes\n",
+		       PAGE_SIZE);
+		return -EINVAL;
+	}
+	return 0;
+}
+#else
+int axfs_get_uml_address(char *iomem, unsigned long *address,
+			 unsigned long *length)
+{
+	return 0;
+}
+#endif /* CONFIG_UML */