xnu-6153.121.1.tar.gz

[apple/xnu.git] / iokit / Kernel / IOInterleavedMemoryDescriptor.cpp

diff --git a/iokit/Kernel/IOInterleavedMemoryDescriptor.cpp b/iokit/Kernel/IOInterleavedMemoryDescriptor.cpp
index 50dbcf2fd5a0b42cdd881d69b286859cb96899d9..7a9f15093e9589ba9f1c5d3e6e929c0ea968c7c5 100644 (file)
--- a/iokit/Kernel/IOInterleavedMemoryDescriptor.cpp
+++ b/iokit/Kernel/IOInterleavedMemoryDescriptor.cpp
@@ -2,7 +2,7 @@
  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
  *
  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
  * 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
  * 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.
  * 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.
  * 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,
  * 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.
  * 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@
  */
 
  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  */
 


@@ -33,242 +33,256 @@
 OSDefineMetaClassAndStructors(IOInterleavedMemoryDescriptor, IOMemoryDescriptor)
 
 IOInterleavedMemoryDescriptor * IOInterleavedMemoryDescriptor::withCapacity(
 OSDefineMetaClassAndStructors(IOInterleavedMemoryDescriptor, IOMemoryDescriptor)
 
 IOInterleavedMemoryDescriptor * IOInterleavedMemoryDescriptor::withCapacity(

-                                  IOByteCount           capacity,
-                                  IODirection           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 = 0;
-    }
-
-    return me;
+       //
+       // 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 )
+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.
-    //
+       //
+       // 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);

 
 

-    assert(capacity);
+       // Ask our superclass' opinion.
+       if (super::init() == false) {
+               return false;
+       }

 
 

-    // Ask our superclass' opinion.
-    if ( super::init() == false )  return false;
-    
-    // Initialize our minimal state.
+       // Initialize our minimal state.

 
 

-    _flags                  = direction;
+       _flags                  = direction;

 #ifndef __LP64__
 #ifndef __LP64__

-    _direction              = (IODirection) (_flags & kIOMemoryDirectionMask);
+       _direction              = (IODirection) (_flags & kIOMemoryDirectionMask);

 #endif /* !__LP64__ */
 #endif /* !__LP64__ */

-    _length                 = 0;
-    _mappings               = 0;
-    _tag                    = 0;
-    _descriptorCount        = 0;
-    _descriptors            = IONew(IOMemoryDescriptor *, capacity);
-    _descriptorOffsets      = IONew(IOByteCount, capacity);
-    _descriptorLengths      = IONew(IOByteCount, capacity);
+       _length                 = 0;
+       _mappings               = NULL;
+       _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;
+       if ((_descriptors == NULL) || (_descriptorOffsets == NULL) || (_descriptorLengths == NULL)) {
+               return false;
+       }

 
 

-    _descriptorCapacity     = capacity;
+       _descriptorCapacity     = capacity;

 
 

-    return true;
+       return true;

 }
 
 }
 

-void IOInterleavedMemoryDescriptor::clearMemoryDescriptors( IODirection direction )
+void
+IOInterleavedMemoryDescriptor::clearMemoryDescriptors( IODirection direction )

 {
 {

-    UInt32 index;
+       UInt32 index;

 
 

-    for ( index = 0; index < _descriptorCount; index++ )
-    {
-        if ( _descriptorPrepared )
-           _descriptors[index]->complete(getDirection());
+       for (index = 0; index < _descriptorCount; index++) {
+               if (_descriptorPrepared) {
+                       _descriptors[index]->complete(getDirection());
+               }

 
 

-       _descriptors[index]->release();
-       _descriptors[index] = 0;
+               _descriptors[index]->release();
+               _descriptors[index] = NULL;

 
 

-       _descriptorOffsets[index] = 0;
-       _descriptorLengths[index] = 0;
-    }
+               _descriptorOffsets[index] = 0;
+               _descriptorLengths[index] = 0;
+       }

 
 

-    if ( direction != kIODirectionNone )
-    {
-        _flags = (_flags & ~kIOMemoryDirectionMask) | direction;
+       if (direction != kIODirectionNone) {
+               _flags = (_flags & ~kIOMemoryDirectionMask) | direction;

 #ifndef __LP64__
 #ifndef __LP64__

-        _direction = (IODirection) (_flags & kIOMemoryDirectionMask);
+               _direction = (IODirection) (_flags & kIOMemoryDirectionMask);

 #endif /* !__LP64__ */
 #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 )
+bool
+IOInterleavedMemoryDescriptor::setMemoryDescriptor(
+       IOMemoryDescriptor * descriptor,
+       IOByteCount offset,
+       IOByteCount length )

 {
 {

-    if ( _descriptorPrepared || (_descriptorCount == _descriptorCapacity) )
-        return false;
+       if (_descriptorPrepared || (_descriptorCount == _descriptorCapacity)) {
+               return false;
+       }

 
 

-    if ( (offset + length) > descriptor->getLength() )
-        return false;
+       if ((offset + length) > descriptor->getLength()) {
+               return false;
+       }

 
 //    if ( descriptor->getDirection() != getDirection() )
 //        return false;
 
 
 //    if ( descriptor->getDirection() != getDirection() )
 //        return false;
 

-    descriptor->retain();
-    _descriptors[_descriptorCount] = descriptor;
-    _descriptorOffsets[_descriptorCount] = offset;
-    _descriptorLengths[_descriptorCount] = length;
+       descriptor->retain();
+       _descriptors[_descriptorCount] = descriptor;
+       _descriptorOffsets[_descriptorCount] = offset;
+       _descriptorLengths[_descriptorCount] = length;

 
 

-    _descriptorCount++;
+       _descriptorCount++;

 
 

-    _length += length;
+       _length += length;

 
 

-    return true;
+       return true;

 }
 
 }
 

-void IOInterleavedMemoryDescriptor::free()
+void
+IOInterleavedMemoryDescriptor::free()

 {
 {

-    //
-    // Free all of this object's outstanding resources.
-    //
+       //
+       // Free all of this object's outstanding resources.
+       //

 
 

-    if ( _descriptors )
-    {
-        for ( unsigned index = 0; index < _descriptorCount; index++ ) 
-            _descriptors[index]->release();
+       if (_descriptors) {
+               for (unsigned index = 0; index < _descriptorCount; index++) {
+                       _descriptors[index]->release();
+               }

 
 

-        if ( _descriptors != 0 )
-            IODelete(_descriptors, IOMemoryDescriptor *, _descriptorCapacity);
+               if (_descriptors != NULL) {
+                       IODelete(_descriptors, IOMemoryDescriptor *, _descriptorCapacity);
+               }

 
 

-        if ( _descriptorOffsets != 0 )
-            IODelete(_descriptorOffsets, IOMemoryDescriptor *, _descriptorCapacity);
+               if (_descriptorOffsets != NULL) {
+                       IODelete(_descriptorOffsets, IOMemoryDescriptor *, _descriptorCapacity);
+               }

 
 

-        if ( _descriptorLengths != 0 )
-            IODelete(_descriptorLengths, IOMemoryDescriptor *, _descriptorCapacity);
-    }
+               if (_descriptorLengths != NULL) {
+                       IODelete(_descriptorLengths, IOMemoryDescriptor *, _descriptorCapacity);
+               }
+       }

 
 

-    super::free();
+       super::free();

 }
 
 }
 

-IOReturn IOInterleavedMemoryDescriptor::prepare(IODirection forDirection)
+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;
+       //
+       // 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)
+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;
+       //
+       // 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 )
+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;
+       //
+       // 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;

 }
 }