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--- xnu/xnu-3248.50.21/iokit/Kernel/IOInterleavedMemoryDescriptor.cpp
+++ xnu/xnu-6153.121.1/iokit/Kernel/IOInterleavedMemoryDescriptor.cpp
@@ -2,7 +2,7 @@
* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* 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
@@ -11,10 +11,10 @@
* 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.
- *
+ *
* 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,
@@ -22,7 +22,7 @@
* 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_OSREFERENCE_LICENSE_HEADER_END@
*/
@@ -33,242 +33,256 @@
OSDefineMetaClassAndStructors(IOInterleavedMemoryDescriptor, IOMemoryDescriptor)
IOInterleavedMemoryDescriptor * IOInterleavedMemoryDescriptor::withCapacity(
- IOByteCount capacity,
- IODirection direction )
-{
- //
- // Create a new IOInterleavedMemoryDescriptor. The "buffer" will be made up
- // of several memory descriptors, that are to be chained end-to-end to make up
- // a single memory descriptor.
- //
-
- IOInterleavedMemoryDescriptor * me = new IOInterleavedMemoryDescriptor;
-
- if ( me && !me->initWithCapacity(
- /* capacity */ capacity,
- /* direction */ direction ))
- {
- me->release();
- me = 0;
- }
-
- return me;
-}
-
-bool IOInterleavedMemoryDescriptor::initWithCapacity(
- IOByteCount capacity,
- IODirection direction )
-{
- //
- // Initialize an IOInterleavedMemoryDescriptor. The "buffer" will be made up
- // of several memory descriptors, that are to be chained end-to-end to make up
- // a single memory descriptor.
- //
-
- assert(capacity);
-
- // Ask our superclass' opinion.
- if ( super::init() == false ) return false;
-
- // Initialize our minimal state.
-
- _flags = direction;
+ IOByteCount capacity,
+ IODirection direction )
+{
+ //
+ // Create a new IOInterleavedMemoryDescriptor. The "buffer" will be made up
+ // of several memory descriptors, that are to be chained end-to-end to make up
+ // a single memory descriptor.
+ //
+
+ IOInterleavedMemoryDescriptor * me = new IOInterleavedMemoryDescriptor;
+
+ if (me && !me->initWithCapacity(
+ /* capacity */ capacity,
+ /* direction */ direction )) {
+ me->release();
+ me = NULL;
+ }
+
+ return me;
+}
+
+bool
+IOInterleavedMemoryDescriptor::initWithCapacity(
+ IOByteCount capacity,
+ IODirection direction )
+{
+ //
+ // Initialize an IOInterleavedMemoryDescriptor. The "buffer" will be made up
+ // of several memory descriptors, that are to be chained end-to-end to make up
+ // a single memory descriptor.
+ //
+
+ assert(capacity);
+
+ // Ask our superclass' opinion.
+ if (super::init() == false) {
+ return false;
+ }
+
+ // Initialize our minimal state.
+
+ _flags = direction;
#ifndef __LP64__
- _direction = (IODirection) (_flags & kIOMemoryDirectionMask);
+ _direction = (IODirection) (_flags & kIOMemoryDirectionMask);
#endif /* !__LP64__ */
- _length = 0;
- _mappings = 0;
- _tag = 0;
- _descriptorCount = 0;
- _descriptors = IONew(IOMemoryDescriptor *, capacity);
- _descriptorOffsets = IONew(IOByteCount, capacity);
- _descriptorLengths = IONew(IOByteCount, capacity);
-
- if ( (_descriptors == 0) || (_descriptorOffsets == 0) || (_descriptorLengths == 0) )
- return false;
-
- _descriptorCapacity = capacity;
-
- return true;
-}
-
-void IOInterleavedMemoryDescriptor::clearMemoryDescriptors( IODirection direction )
-{
- UInt32 index;
-
- for ( index = 0; index < _descriptorCount; index++ )
- {
- if ( _descriptorPrepared )
- _descriptors[index]->complete(getDirection());
-
- _descriptors[index]->release();
- _descriptors[index] = 0;
-
- _descriptorOffsets[index] = 0;
- _descriptorLengths[index] = 0;
- }
-
- if ( direction != kIODirectionNone )
- {
- _flags = (_flags & ~kIOMemoryDirectionMask) | direction;
+ _length = 0;
+ _mappings = NULL;
+ _tag = 0;
+ _descriptorCount = 0;
+ _descriptors = IONew(IOMemoryDescriptor *, capacity);
+ _descriptorOffsets = IONew(IOByteCount, capacity);
+ _descriptorLengths = IONew(IOByteCount, capacity);
+
+ if ((_descriptors == NULL) || (_descriptorOffsets == NULL) || (_descriptorLengths == NULL)) {
+ return false;
+ }
+
+ _descriptorCapacity = capacity;
+
+ return true;
+}
+
+void
+IOInterleavedMemoryDescriptor::clearMemoryDescriptors( IODirection direction )
+{
+ UInt32 index;
+
+ for (index = 0; index < _descriptorCount; index++) {
+ if (_descriptorPrepared) {
+ _descriptors[index]->complete(getDirection());
+ }
+
+ _descriptors[index]->release();
+ _descriptors[index] = NULL;
+
+ _descriptorOffsets[index] = 0;
+ _descriptorLengths[index] = 0;
+ }
+
+ if (direction != kIODirectionNone) {
+ _flags = (_flags & ~kIOMemoryDirectionMask) | direction;
#ifndef __LP64__
- _direction = (IODirection) (_flags & kIOMemoryDirectionMask);
+ _direction = (IODirection) (_flags & kIOMemoryDirectionMask);
#endif /* !__LP64__ */
- }
-
- _descriptorCount = 0;
- _length = 0;
- _mappings = 0;
- _tag = 0;
-
+ }
+
+ _descriptorCount = 0;
+ _length = 0;
+ _mappings = NULL;
+ _tag = 0;
};
-bool IOInterleavedMemoryDescriptor::setMemoryDescriptor(
- IOMemoryDescriptor * descriptor,
- IOByteCount offset,
- IOByteCount length )
-{
- if ( _descriptorPrepared || (_descriptorCount == _descriptorCapacity) )
- return false;
-
- if ( (offset + length) > descriptor->getLength() )
- return false;
+bool
+IOInterleavedMemoryDescriptor::setMemoryDescriptor(
+ IOMemoryDescriptor * descriptor,
+ IOByteCount offset,
+ IOByteCount length )
+{
+ if (_descriptorPrepared || (_descriptorCount == _descriptorCapacity)) {
+ return false;
+ }
+
+ if ((offset + length) > descriptor->getLength()) {
+ return false;
+ }
// if ( descriptor->getDirection() != getDirection() )
// return false;
- descriptor->retain();
- _descriptors[_descriptorCount] = descriptor;
- _descriptorOffsets[_descriptorCount] = offset;
- _descriptorLengths[_descriptorCount] = length;
-
- _descriptorCount++;
-
- _length += length;
-
- return true;
-}
-
-void IOInterleavedMemoryDescriptor::free()
-{
- //
- // Free all of this object's outstanding resources.
- //
-
- if ( _descriptors )
- {
- for ( unsigned index = 0; index < _descriptorCount; index++ )
- _descriptors[index]->release();
-
- if ( _descriptors != 0 )
- IODelete(_descriptors, IOMemoryDescriptor *, _descriptorCapacity);
-
- if ( _descriptorOffsets != 0 )
- IODelete(_descriptorOffsets, IOMemoryDescriptor *, _descriptorCapacity);
-
- if ( _descriptorLengths != 0 )
- IODelete(_descriptorLengths, IOMemoryDescriptor *, _descriptorCapacity);
- }
-
- super::free();
-}
-
-IOReturn IOInterleavedMemoryDescriptor::prepare(IODirection forDirection)
-{
- //
- // Prepare the memory for an I/O transfer.
- //
- // This involves paging in the memory and wiring it down for the duration
- // of the transfer. The complete() method finishes the processing of the
- // memory after the I/O transfer finishes.
- //
-
- unsigned index;
- IOReturn status = kIOReturnSuccess;
- IOReturn statusUndo;
-
- if ( forDirection == kIODirectionNone )
- {
- forDirection = getDirection();
- }
-
- for ( index = 0; index < _descriptorCount; index++ )
- {
- status = _descriptors[index]->prepare(forDirection);
- if ( status != kIOReturnSuccess ) break;
- }
-
- if ( status != kIOReturnSuccess )
- {
- for ( unsigned indexUndo = 0; indexUndo < index; indexUndo++ )
- {
- statusUndo = _descriptors[index]->complete(forDirection);
- assert(statusUndo == kIOReturnSuccess);
- }
- }
-
- if ( status == kIOReturnSuccess ) _descriptorPrepared = true;
-
- return status;
-}
-
-IOReturn IOInterleavedMemoryDescriptor::complete(IODirection forDirection)
-{
- //
- // Complete processing of the memory after an I/O transfer finishes.
- //
- // This method shouldn't be called unless a prepare() was previously issued;
- // the prepare() and complete() must occur in pairs, before and after an I/O
- // transfer.
- //
-
- IOReturn status;
- IOReturn statusFinal = kIOReturnSuccess;
-
- if ( forDirection == kIODirectionNone )
- {
- forDirection = getDirection();
- }
-
- for ( unsigned index = 0; index < _descriptorCount; index++ )
- {
- status = _descriptors[index]->complete(forDirection);
- if ( status != kIOReturnSuccess ) statusFinal = status;
- assert(status == kIOReturnSuccess);
- }
-
- _descriptorPrepared = false;
-
- return statusFinal;
-}
-
-addr64_t IOInterleavedMemoryDescriptor::getPhysicalSegment(
- IOByteCount offset,
- IOByteCount * length,
- IOOptionBits options )
-{
- //
- // This method returns the physical address of the byte at the given offset
- // into the memory, and optionally the length of the physically contiguous
- // segment from that offset.
- //
-
- addr64_t pa;
-
- assert(offset <= _length);
-
- for ( unsigned index = 0; index < _descriptorCount; index++ )
- {
- if ( offset < _descriptorLengths[index] )
- {
- pa = _descriptors[index]->getPhysicalSegment(_descriptorOffsets[index] + offset, length, options);
- if ((_descriptorLengths[index] - offset) < *length) *length = _descriptorLengths[index] - offset;
- return pa;
- }
- offset -= _descriptorLengths[index];
- }
-
- if ( length ) *length = 0;
-
- return 0;
-}
+ descriptor->retain();
+ _descriptors[_descriptorCount] = descriptor;
+ _descriptorOffsets[_descriptorCount] = offset;
+ _descriptorLengths[_descriptorCount] = length;
+
+ _descriptorCount++;
+
+ _length += length;
+
+ return true;
+}
+
+void
+IOInterleavedMemoryDescriptor::free()
+{
+ //
+ // Free all of this object's outstanding resources.
+ //
+
+ if (_descriptors) {
+ for (unsigned index = 0; index < _descriptorCount; index++) {
+ _descriptors[index]->release();
+ }
+
+ if (_descriptors != NULL) {
+ IODelete(_descriptors, IOMemoryDescriptor *, _descriptorCapacity);
+ }
+
+ if (_descriptorOffsets != NULL) {
+ IODelete(_descriptorOffsets, IOMemoryDescriptor *, _descriptorCapacity);
+ }
+
+ if (_descriptorLengths != NULL) {
+ IODelete(_descriptorLengths, IOMemoryDescriptor *, _descriptorCapacity);
+ }
+ }
+
+ super::free();
+}
+
+IOReturn
+IOInterleavedMemoryDescriptor::prepare(IODirection forDirection)
+{
+ //
+ // Prepare the memory for an I/O transfer.
+ //
+ // This involves paging in the memory and wiring it down for the duration
+ // of the transfer. The complete() method finishes the processing of the
+ // memory after the I/O transfer finishes.
+ //
+
+ unsigned index;
+ IOReturn status = kIOReturnSuccess;
+ IOReturn statusUndo;
+
+ if (forDirection == kIODirectionNone) {
+ forDirection = getDirection();
+ }
+
+ for (index = 0; index < _descriptorCount; index++) {
+ status = _descriptors[index]->prepare(forDirection);
+ if (status != kIOReturnSuccess) {
+ break;
+ }
+ }
+
+ if (status != kIOReturnSuccess) {
+ for (unsigned indexUndo = 0; indexUndo < index; indexUndo++) {
+ statusUndo = _descriptors[index]->complete(forDirection);
+ assert(statusUndo == kIOReturnSuccess);
+ }
+ }
+
+ if (status == kIOReturnSuccess) {
+ _descriptorPrepared = true;
+ }
+
+ return status;
+}
+
+IOReturn
+IOInterleavedMemoryDescriptor::complete(IODirection forDirection)
+{
+ //
+ // Complete processing of the memory after an I/O transfer finishes.
+ //
+ // This method shouldn't be called unless a prepare() was previously issued;
+ // the prepare() and complete() must occur in pairs, before and after an I/O
+ // transfer.
+ //
+
+ IOReturn status;
+ IOReturn statusFinal = kIOReturnSuccess;
+
+ if (forDirection == kIODirectionNone) {
+ forDirection = getDirection();
+ }
+
+ for (unsigned index = 0; index < _descriptorCount; index++) {
+ status = _descriptors[index]->complete(forDirection);
+ if (status != kIOReturnSuccess) {
+ statusFinal = status;
+ }
+ assert(status == kIOReturnSuccess);
+ }
+
+ _descriptorPrepared = false;
+
+ return statusFinal;
+}
+
+addr64_t
+IOInterleavedMemoryDescriptor::getPhysicalSegment(
+ IOByteCount offset,
+ IOByteCount * length,
+ IOOptionBits options )
+{
+ //
+ // This method returns the physical address of the byte at the given offset
+ // into the memory, and optionally the length of the physically contiguous
+ // segment from that offset.
+ //
+
+ addr64_t pa;
+
+ assert(offset <= _length);
+
+ for (unsigned index = 0; index < _descriptorCount; index++) {
+ if (offset < _descriptorLengths[index]) {
+ pa = _descriptors[index]->getPhysicalSegment(_descriptorOffsets[index] + offset, length, options);
+ if ((_descriptorLengths[index] - offset) < *length) {
+ *length = _descriptorLengths[index] - offset;
+ }
+ return pa;
+ }
+ offset -= _descriptorLengths[index];
+ }
+
+ if (length) {
+ *length = 0;
+ }
+
+ return 0;
+}