xnu-344.23.tar.gz

[apple/xnu.git] / iokit / IOKit / IOBufferMemoryDescriptor.h

diff --git a/iokit/IOKit/IOBufferMemoryDescriptor.h b/iokit/IOKit/IOBufferMemoryDescriptor.h
index 810c087a778093097bb0eb7544d1b712b0430fa6..4e40b5a8bb8b28c8f9cc52bb6b53aeced992dfad 100644 (file)
--- a/iokit/IOKit/IOBufferMemoryDescriptor.h
+++ b/iokit/IOKit/IOBufferMemoryDescriptor.h
@@ -3,22 +3,19 @@
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
- * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
+ * The contents of this file constitute Original Code as defined in and
+ * are subject to the Apple Public Source License Version 1.1 (the
+ * "License").  You may not use this file except in compliance with the
+ * License.  Please obtain a copy of the License at
+ * http://www.apple.com/publicsource and read it before using this file.
  * 
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- * 
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This Original Code and all software distributed under the License are
+ * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
  * 
  * @APPLE_LICENSE_HEADER_END@
  */
@@ -28,6 +25,7 @@
 #include <IOKit/IOMemoryDescriptor.h>
 
 enum {
+    kIOMemoryDirectionMask             = 0x0000000f,
     kIOMemoryPhysicallyContiguous      = 0x00000010,
     kIOMemoryPageable                  = 0x00000020,
     kIOMemorySharingTypeMask           = 0x000f0000,
@@ -239,6 +237,15 @@ public:
      * will not copy past the end of the memory descriptor's current capacity.
      */
     virtual bool appendBytes(const void *bytes, vm_size_t withLength);
+
+    /*
+     * getPhysicalSegment:
+     *
+     * Get the physical address of the buffer, relative to the current position.
+     * If the current position is at the end of the buffer, a zero is returned.
+     */
+    virtual IOPhysicalAddress getPhysicalSegment(IOByteCount offset,
+                                                IOByteCount * length);    
 };
 
 #endif /* !_IOBUFFERMEMORYDESCRIPTOR_H */