/*
* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
- * 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. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * 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
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * 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.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/* IOMemoryCursor.cpp created by wgulland on 1999-3-02 */
IOPhysicalLength inMaxTransferSize,
IOPhysicalLength inAlignment)
{
+// @@@ gvdl: Remove me
+#if 1
+static UInt sMaxDBDMASegment;
+if (!sMaxDBDMASegment) {
+ sMaxDBDMASegment = (UInt) -1;
+ if (PE_parse_boot_argn("mseg", &sMaxDBDMASegment, sizeof (sMaxDBDMASegment)))
+ IOLog("Setting MaxDBDMASegment to %d\n", sMaxDBDMASegment);
+}
+
+if (inMaxSegmentSize > sMaxDBDMASegment) inMaxSegmentSize = sMaxDBDMASegment;
+#endif
+
if (!super::init())
return false;
UInt32
IOMemoryCursor::genPhysicalSegments(IOMemoryDescriptor *inDescriptor,
- IOPhysicalLength fromPosition,
+ IOByteCount fromPosition,
void * inSegments,
UInt32 inMaxSegments,
UInt32 inMaxTransferSize,
* If we finished cleanly return number of segments found
* and update the position in the descriptor.
*/
+ PhysicalSegment curSeg = { 0, 0 };
UInt curSegIndex = 0;
UInt curTransferSize = 0;
- PhysicalSegment seg;
+ IOByteCount inDescriptorLength = inDescriptor->getLength();
+ PhysicalSegment seg = { 0, 0 };
- while ((curSegIndex < inMaxSegments)
- && (curTransferSize < inMaxTransferSize)
- && (seg.location = inDescriptor->getPhysicalSegment(
- fromPosition + curTransferSize, &seg.length)))
+ while ((seg.location) || (fromPosition < inDescriptorLength))
{
- assert(seg.length);
- seg.length = min(inMaxTransferSize-curTransferSize,
- (min(seg.length, maxSegmentSize)));
- (*outSeg)(seg, inSegments, curSegIndex++);
- curTransferSize += seg.length;
+ if (!seg.location)
+ {
+ seg.location = inDescriptor->getPhysicalSegment(
+ fromPosition, (IOByteCount*)&seg.length);
+ assert(seg.location);
+ assert(seg.length);
+ fromPosition += seg.length;
+ }
+
+ if (!curSeg.location)
+ {
+ curTransferSize += seg.length;
+ curSeg = seg;
+ seg.location = 0;
+ }
+ else if ((curSeg.location + curSeg.length == seg.location))
+ {
+ curTransferSize += seg.length;
+ curSeg.length += seg.length;
+ seg.location = 0;
+ }
+
+ if (!seg.location)
+ {
+ if ((curSeg.length > maxSegmentSize))
+ {
+ seg.location = curSeg.location + maxSegmentSize;
+ seg.length = curSeg.length - maxSegmentSize;
+ curTransferSize -= seg.length;
+ curSeg.length -= seg.length;
+ }
+
+ if ((curTransferSize >= inMaxTransferSize))
+ {
+ curSeg.length -= curTransferSize - inMaxTransferSize;
+ curTransferSize = inMaxTransferSize;
+ break;
+ }
+ }
+
+ if (seg.location)
+ {
+ if ((curSegIndex + 1 == inMaxSegments))
+ break;
+ (*outSeg)(curSeg, inSegments, curSegIndex++);
+ curSeg.location = 0;
+ }
}
+ if (curSeg.location)
+ (*outSeg)(curSeg, inSegments, curSegIndex++);
+
if (outTransferSize)
*outTransferSize = curTransferSize;
inMaxTransferSize,
inAlignment);
}
-
-/************************* class IODBDMAMemoryCursor *************************/
-
-#if defined(__ppc__)
-
-#include <IOKit/ppc/IODBDMA.h>
-
-#undef super
-#define super IOMemoryCursor
-OSDefineMetaClassAndStructors(IODBDMAMemoryCursor, IOMemoryCursor)
-
-void
-IODBDMAMemoryCursor::outputSegment(PhysicalSegment inSegment,
- void * inSegments,
- UInt32 inSegmentIndex)
-{
- IODBDMADescriptor *segment;
-
- segment = &((IODBDMADescriptor *) inSegments)[inSegmentIndex];
-
- // Write location into address field
- OSWriteSwapInt32((UInt32 *) segment, 4, inSegment.location);
-
- // Write count into 1st two bytes of operation field.
- // DO NOT touch rest of operation field as it should contain a STOP command.
- OSWriteSwapInt16((UInt16 *) segment, 0, inSegment.length);
-}
-
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-IODBDMAMemoryCursor *
-IODBDMAMemoryCursor::withSpecification(IOPhysicalLength inMaxSegmentSize,
- IOPhysicalLength inMaxTransferSize,
- IOPhysicalLength inAlignment)
-{
- IODBDMAMemoryCursor *me = new IODBDMAMemoryCursor;
-
- if (me && !me->initWithSpecification(inMaxSegmentSize,
- inMaxTransferSize,
- inAlignment))
- {
- me->release();
- return 0;
- }
-
- return me;
-}
-
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-bool
-IODBDMAMemoryCursor::initWithSpecification(IOPhysicalLength inMaxSegmentSize,
- IOPhysicalLength inMaxTransferSize,
- IOPhysicalLength inAlignment)
-{
- return super::initWithSpecification(&IODBDMAMemoryCursor::outputSegment,
- inMaxSegmentSize,
- inMaxTransferSize,
- inAlignment);
-}
-
-#endif /* defined(__ppc__) */
-
projects / apple / xnu.git / blobdiff