/*
* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
+ * @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
- * 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.
+ * 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.
+ *
+ * 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
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
+
+#define _IOMEMORYDESCRIPTOR_INTERNAL_
+
#include <IOKit/assert.h>
#include <IOKit/system.h>
#include <IOKit/IOLib.h>
+#include <IOKit/IOMapper.h>
#include <IOKit/IOBufferMemoryDescriptor.h>
+#include <libkern/OSDebug.h>
+#include <mach/mach_vm.h>
#include "IOKitKernelInternal.h"
+#ifdef IOALLOCDEBUG
+#include <libkern/c++/OSCPPDebug.h>
+#endif
+#include <IOKit/IOStatisticsPrivate.h>
+
+#if IOKITSTATS
+#define IOStatisticsAlloc(type, size) \
+do { \
+ IOStatistics::countAlloc(type, size); \
+} while (0)
+#else
+#define IOStatisticsAlloc(type, size)
+#endif /* IOKITSTATS */
+
+
__BEGIN_DECLS
void ipc_port_release_send(ipc_port_t port);
#include <vm/pmap.h>
-vm_map_t IOPageableMapForAddress( vm_address_t address );
__END_DECLS
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+enum
+{
+ kInternalFlagPhysical = 0x00000001,
+ kInternalFlagPageSized = 0x00000002,
+ kInternalFlagPageAllocated = 0x00000004
+};
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
#define super IOGeneralMemoryDescriptor
OSDefineMetaClassAndStructors(IOBufferMemoryDescriptor,
IOGeneralMemoryDescriptor);
-bool IOBufferMemoryDescriptor::initWithAddress(
- void * /* address */ ,
- IOByteCount /* withLength */ ,
- IODirection /* withDirection */ )
-{
- return false;
-}
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-bool IOBufferMemoryDescriptor::initWithAddress(
- vm_address_t /* address */ ,
- IOByteCount /* withLength */ ,
- IODirection /* withDirection */ ,
- task_t /* withTask */ )
+static uintptr_t IOBMDPageProc(iopa_t * a)
{
- return false;
-}
+ kern_return_t kr;
+ vm_address_t vmaddr = 0;
+ int options = 0; // KMA_LOMEM;
-bool IOBufferMemoryDescriptor::initWithPhysicalAddress(
- IOPhysicalAddress /* address */ ,
- IOByteCount /* withLength */ ,
- IODirection /* withDirection */ )
-{
- return false;
-}
+ kr = kernel_memory_allocate(kernel_map, &vmaddr,
+ page_size, 0, options, VM_KERN_MEMORY_IOKIT);
-bool IOBufferMemoryDescriptor::initWithPhysicalRanges(
- IOPhysicalRange * /* ranges */ ,
- UInt32 /* withCount */ ,
- IODirection /* withDirection */ ,
- bool /* asReference */ )
-{
- return false;
-}
+ if (KERN_SUCCESS != kr) vmaddr = 0;
+ else bzero((void *) vmaddr, page_size);
-bool IOBufferMemoryDescriptor::initWithRanges(
- IOVirtualRange * /* ranges */ ,
- UInt32 /* withCount */ ,
- IODirection /* withDirection */ ,
- task_t /* withTask */ ,
- bool /* asReference */ )
-{
- return false;
+ return ((uintptr_t) vmaddr);
}
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+#ifndef __LP64__
bool IOBufferMemoryDescriptor::initWithOptions(
IOOptionBits options,
vm_size_t capacity,
vm_offset_t alignment,
task_t inTask)
{
- kern_return_t kr;
- vm_map_t vmmap = 0;
- IOOptionBits iomdOptions = kIOMemoryAsReference | kIOMemoryTypeVirtual;
+ mach_vm_address_t physicalMask = 0;
+ return (initWithPhysicalMask(inTask, options, capacity, alignment, physicalMask));
+}
+#endif /* !__LP64__ */
+
+bool IOBufferMemoryDescriptor::initWithPhysicalMask(
+ task_t inTask,
+ IOOptionBits options,
+ mach_vm_size_t capacity,
+ mach_vm_address_t alignment,
+ mach_vm_address_t physicalMask)
+{
+ task_t mapTask = NULL;
+ vm_map_t vmmap = NULL;
+ mach_vm_address_t highestMask = 0;
+ IOOptionBits iomdOptions = kIOMemoryTypeVirtual64 | kIOMemoryAsReference;
+ IODMAMapSpecification mapSpec;
+ bool mapped = false;
+ bool needZero;
+
+ if (!capacity) return false;
+
+ _options = options;
+ _capacity = capacity;
+ _internalFlags = 0;
+ _internalReserved = 0;
+ _buffer = 0;
+
+ _ranges.v64 = IONew(IOAddressRange, 1);
+ if (!_ranges.v64)
+ return (false);
+ _ranges.v64->address = 0;
+ _ranges.v64->length = 0;
+ // make sure super::free doesn't dealloc _ranges before super::init
+ _flags = kIOMemoryAsReference;
+
+ // Grab IOMD bits from the Buffer MD options
+ iomdOptions |= (options & kIOBufferDescriptorMemoryFlags);
+
+ if (!(kIOMemoryMapperNone & options))
+ {
+ IOMapper::checkForSystemMapper();
+ mapped = (0 != IOMapper::gSystem);
+ }
+ needZero = (mapped || (0 != (kIOMemorySharingTypeMask & options)));
- if (!capacity)
- return false;
+ if (physicalMask && (alignment <= 1))
+ {
+ alignment = ((physicalMask ^ (-1ULL)) & (physicalMask - 1));
+ highestMask = (physicalMask | alignment);
+ alignment++;
+ if (alignment < page_size)
+ alignment = page_size;
+ }
+
+ if ((options & (kIOMemorySharingTypeMask | kIOMapCacheMask | kIOMemoryClearEncrypt)) && (alignment < page_size))
+ alignment = page_size;
+
+ if (alignment >= page_size)
+ capacity = round_page(capacity);
- _options = options;
- _capacity = capacity;
- _physAddrs = 0;
- _physSegCount = 0;
- _buffer = 0;
+ if (alignment > page_size)
+ options |= kIOMemoryPhysicallyContiguous;
- // Grab the direction and the Auto Prepare bits from the Buffer MD options
- iomdOptions |= options & (kIOMemoryDirectionMask | kIOMemoryAutoPrepare);
+ _alignment = alignment;
- if ((options & kIOMemorySharingTypeMask) && (alignment < page_size))
- alignment = page_size;
+ if ((capacity + alignment) < _capacity) return (false);
if ((inTask != kernel_task) && !(options & kIOMemoryPageable))
- return false;
+ return false;
- _alignment = alignment;
- if (options & kIOMemoryPageable)
+ bzero(&mapSpec, sizeof(mapSpec));
+ mapSpec.alignment = _alignment;
+ mapSpec.numAddressBits = 64;
+ if (highestMask && mapped)
{
- iomdOptions |= kIOMemoryBufferPageable;
+ if (highestMask <= 0xFFFFFFFF)
+ mapSpec.numAddressBits = (32 - __builtin_clz((unsigned int) highestMask));
+ else
+ mapSpec.numAddressBits = (64 - __builtin_clz((unsigned int) (highestMask >> 32)));
+ highestMask = 0;
+ }
- ipc_port_t sharedMem;
- vm_size_t size = round_page_32(capacity);
+ // set memory entry cache mode, pageable, purgeable
+ iomdOptions |= ((options & kIOMapCacheMask) >> kIOMapCacheShift) << kIOMemoryBufferCacheShift;
+ if (options & kIOMemoryPageable)
+ {
+ iomdOptions |= kIOMemoryBufferPageable;
+ if (options & kIOMemoryPurgeable) iomdOptions |= kIOMemoryBufferPurgeable;
+ }
+ else
+ {
+ vmmap = kernel_map;
- // must create the entry before any pages are allocated
+ // Buffer shouldn't auto prepare they should be prepared explicitly
+ // But it never was enforced so what are you going to do?
+ iomdOptions |= kIOMemoryAutoPrepare;
- // set flags for entry + object create
- vm_prot_t memEntryCacheMode = VM_PROT_READ | VM_PROT_WRITE
- | MAP_MEM_NAMED_CREATE;
+ /* Allocate a wired-down buffer inside kernel space. */
- if (options & kIOMemoryPurgeable)
- memEntryCacheMode |= MAP_MEM_PURGABLE;
+ bool contig = (0 != (options & kIOMemoryHostPhysicallyContiguous));
- // set memory entry cache mode
- switch (options & kIOMapCacheMask)
+ if (!contig && (0 != (options & kIOMemoryPhysicallyContiguous)))
{
- case kIOMapInhibitCache:
- SET_MAP_MEM(MAP_MEM_IO, memEntryCacheMode);
- break;
-
- case kIOMapWriteThruCache:
- SET_MAP_MEM(MAP_MEM_WTHRU, memEntryCacheMode);
- break;
-
- case kIOMapWriteCombineCache:
- SET_MAP_MEM(MAP_MEM_WCOMB, memEntryCacheMode);
- break;
-
- case kIOMapCopybackCache:
- SET_MAP_MEM(MAP_MEM_COPYBACK, memEntryCacheMode);
- break;
-
- case kIOMapDefaultCache:
- default:
- SET_MAP_MEM(MAP_MEM_NOOP, memEntryCacheMode);
- break;
+ contig |= (!mapped);
+ contig |= (0 != (kIOMemoryMapperNone & options));
+#if 0
+ // treat kIOMemoryPhysicallyContiguous as kIOMemoryHostPhysicallyContiguous for now
+ contig |= true;
+#endif
}
- kr = mach_make_memory_entry( vmmap,
- &size, 0,
- memEntryCacheMode, &sharedMem,
- NULL );
-
- if( (KERN_SUCCESS == kr) && (size != round_page_32(capacity))) {
- ipc_port_release_send( sharedMem );
- kr = kIOReturnVMError;
+ if (contig || highestMask || (alignment > page_size))
+ {
+ _internalFlags |= kInternalFlagPhysical;
+ if (highestMask)
+ {
+ _internalFlags |= kInternalFlagPageSized;
+ capacity = round_page(capacity);
+ }
+ _buffer = (void *) IOKernelAllocateWithPhysicalRestrict(
+ capacity, highestMask, alignment, contig);
}
- if( KERN_SUCCESS != kr)
- return( false );
-
- _memEntry = (void *) sharedMem;
+ else if (needZero
+ && ((capacity + alignment) <= (page_size - gIOPageAllocChunkBytes)))
+ {
+ _internalFlags |= kInternalFlagPageAllocated;
+ needZero = false;
+ _buffer = (void *) iopa_alloc(&gIOBMDPageAllocator, &IOBMDPageProc, capacity, alignment);
+ if (_buffer)
+ {
+ IOStatisticsAlloc(kIOStatisticsMallocAligned, capacity);
#if IOALLOCDEBUG
- debug_iomallocpageable_size += size;
+ OSAddAtomic(capacity, &debug_iomalloc_size);
#endif
- if ((NULL == inTask) && (options & kIOMemoryPageable))
- inTask = kernel_task;
- else if (inTask == kernel_task)
+ }
+ }
+ else if (alignment > 1)
{
- vmmap = kernel_map;
+ _buffer = IOMallocAligned(capacity, alignment);
}
else
{
-
- if( !reserved) {
- reserved = IONew( ExpansionData, 1 );
- if( !reserved)
- return( false );
- }
- vmmap = get_task_map(inTask);
- vm_map_reference(vmmap);
- reserved->map = vmmap;
+ _buffer = IOMalloc(capacity);
}
+ if (!_buffer)
+ {
+ return false;
+ }
+ if (needZero) bzero(_buffer, capacity);
}
- else
- {
- // @@@ gvdl: Need to remove this
- // Buffer should never auto prepare they should be prepared explicitly
- // But it never was enforced so what are you going to do?
- iomdOptions |= kIOMemoryAutoPrepare;
- /* Allocate a wired-down buffer inside kernel space. */
- if (options & kIOMemoryPhysicallyContiguous)
- _buffer = IOMallocContiguous(capacity, alignment, 0);
- else if (alignment > 1)
- _buffer = IOMallocAligned(capacity, alignment);
- else
- _buffer = IOMalloc(capacity);
+ if( (options & (kIOMemoryPageable | kIOMapCacheMask))) {
+ vm_size_t size = round_page(capacity);
- if (!_buffer)
- return false;
+ // initWithOptions will create memory entry
+ iomdOptions |= kIOMemoryPersistent;
+
+ if( options & kIOMemoryPageable) {
+#if IOALLOCDEBUG
+ OSAddAtomicLong(size, &debug_iomallocpageable_size);
+#endif
+ mapTask = inTask;
+ if (NULL == inTask)
+ inTask = kernel_task;
+ }
+ else if (options & kIOMapCacheMask)
+ {
+ // Prefetch each page to put entries into the pmap
+ volatile UInt8 * startAddr = (UInt8 *)_buffer;
+ volatile UInt8 * endAddr = (UInt8 *)_buffer + capacity;
+
+ while (startAddr < endAddr)
+ {
+ UInt8 dummyVar = *startAddr;
+ (void) dummyVar;
+ startAddr += page_size;
+ }
+ }
}
- _singleRange.v.address = (vm_address_t) _buffer;
- _singleRange.v.length = capacity;
+ _ranges.v64->address = (mach_vm_address_t) _buffer;;
+ _ranges.v64->length = _capacity;
- if (!super::initWithOptions(&_singleRange.v, 1, 0,
- inTask, iomdOptions, /* System mapper */ 0))
+ if (!super::initWithOptions(_ranges.v64, 1, 0,
+ inTask, iomdOptions, /* System mapper */ 0))
return false;
- if (options & kIOMemoryPageable)
- {
- kern_return_t kr;
+ // give any system mapper the allocation params
+ if (kIOReturnSuccess != dmaCommandOperation(kIOMDAddDMAMapSpec,
+ &mapSpec, sizeof(mapSpec)))
+ return false;
- if (vmmap)
- {
- kr = doMap(vmmap, (IOVirtualAddress *) &_buffer, kIOMapAnywhere, 0, round_page_32(capacity));
- if (KERN_SUCCESS != kr)
- {
- _buffer = 0;
+ if (mapTask)
+ {
+ if (!reserved) {
+ reserved = IONew( ExpansionData, 1 );
+ if( !reserved)
return( false );
- }
- _singleRange.v.address = (vm_address_t) _buffer;
}
+ reserved->map = createMappingInTask(mapTask, 0,
+ kIOMapAnywhere | (options & kIOMapPrefault) | (options & kIOMapCacheMask), 0, 0);
+ if (!reserved->map)
+ {
+ _buffer = 0;
+ return( false );
+ }
+ release(); // map took a retain on this
+ reserved->map->retain();
+ removeMapping(reserved->map);
+ mach_vm_address_t buffer = reserved->map->getAddress();
+ _buffer = (void *) buffer;
+ if (kIOMemoryTypeVirtual64 == (kIOMemoryTypeMask & iomdOptions))
+ _ranges.v64->address = buffer;
}
- setLength(capacity);
-
+ setLength(_capacity);
+
return true;
}
{
IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
- if (me && !me->initWithOptions(options, capacity, alignment, inTask)) {
+ if (me && !me->initWithPhysicalMask(inTask, options, capacity, alignment, 0)) {
me->release();
me = 0;
}
return me;
}
+IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::inTaskWithPhysicalMask(
+ task_t inTask,
+ IOOptionBits options,
+ mach_vm_size_t capacity,
+ mach_vm_address_t physicalMask)
+{
+ IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
+
+ if (me && !me->initWithPhysicalMask(inTask, options, capacity, 1, physicalMask))
+ {
+ me->release();
+ me = 0;
+ }
+ return me;
+}
+
+#ifndef __LP64__
bool IOBufferMemoryDescriptor::initWithOptions(
IOOptionBits options,
vm_size_t capacity,
vm_offset_t alignment)
{
- return( initWithOptions(options, capacity, alignment, kernel_task) );
+ return (initWithPhysicalMask(kernel_task, options, capacity, alignment, (mach_vm_address_t)0));
}
+#endif /* !__LP64__ */
IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::withOptions(
IOOptionBits options,
{
IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
- if (me && !me->initWithOptions(options, capacity, alignment, kernel_task)) {
+ if (me && !me->initWithPhysicalMask(kernel_task, options, capacity, alignment, 0)) {
me->release();
me = 0;
}
inCapacity, inContiguous ? inCapacity : 1 ));
}
+#ifndef __LP64__
/*
* initWithBytes:
*
IODirection inDirection,
bool inContiguous)
{
- if (!initWithOptions(
- inDirection | kIOMemoryUnshared
- | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
- inLength, inLength ))
+ if (!initWithPhysicalMask(kernel_task, inDirection | kIOMemoryUnshared
+ | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
+ inLength, inLength, (mach_vm_address_t)0))
return false;
// start out with no data
return true;
}
+#endif /* !__LP64__ */
/*
* withBytes:
{
IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
- if (me && !me->initWithBytes(inBytes, inLength, inDirection, inContiguous)){
- me->release();
- me = 0;
+ if (me && !me->initWithPhysicalMask(
+ kernel_task, inDirection | kIOMemoryUnshared
+ | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
+ inLength, inLength, 0 ))
+ {
+ me->release();
+ me = 0;
+ }
+
+ if (me)
+ {
+ // start out with no data
+ me->setLength(0);
+
+ if (!me->appendBytes(inBytes, inLength))
+ {
+ me->release();
+ me = 0;
+ }
}
return me;
}
{
// Cache all of the relevant information on the stack for use
// after we call super::free()!
- IOOptionBits options = _options;
- vm_size_t size = _capacity;
- void * buffer = _buffer;
- vm_map_t vmmap = 0;
- vm_offset_t alignment = _alignment;
+ IOOptionBits flags = _flags;
+ IOOptionBits internalFlags = _internalFlags;
+ IOOptionBits options = _options;
+ vm_size_t size = _capacity;
+ void * buffer = _buffer;
+ IOMemoryMap * map = 0;
+ IOAddressRange * range = _ranges.v64;
+ vm_offset_t alignment = _alignment;
+
+ if (alignment >= page_size)
+ size = round_page(size);
if (reserved)
{
- vmmap = reserved->map;
+ map = reserved->map;
IODelete( reserved, ExpansionData, 1 );
+ if (map)
+ map->release();
}
/* super::free may unwire - deallocate buffer afterwards */
if (options & kIOMemoryPageable)
{
#if IOALLOCDEBUG
- if (!buffer || vmmap)
- debug_iomallocpageable_size -= round_page_32(size);
+ OSAddAtomicLong(-(round_page(size)), &debug_iomallocpageable_size);
#endif
- if (buffer)
- {
- if (vmmap)
- vm_deallocate(vmmap, (vm_address_t) buffer, round_page_32(size));
- else
- IOFreePageable(buffer, size);
- }
}
else if (buffer)
{
- if (options & kIOMemoryPhysicallyContiguous)
- IOFreeContiguous(buffer, size);
+ if (kInternalFlagPageSized & internalFlags) size = round_page(size);
+
+ if (kInternalFlagPhysical & internalFlags)
+ {
+ IOKernelFreePhysical((mach_vm_address_t) buffer, size);
+ }
+ else if (kInternalFlagPageAllocated & internalFlags)
+ {
+ uintptr_t page;
+ page = iopa_free(&gIOBMDPageAllocator, (uintptr_t) buffer, size);
+ if (page)
+ {
+ kmem_free(kernel_map, page, page_size);
+ }
+#if IOALLOCDEBUG
+ OSAddAtomic(-size, &debug_iomalloc_size);
+#endif
+ IOStatisticsAlloc(kIOStatisticsFreeAligned, size);
+ }
else if (alignment > 1)
+ {
IOFreeAligned(buffer, size);
+ }
else
+ {
IOFree(buffer, size);
+ }
}
- if (vmmap)
- vm_map_deallocate(vmmap);
+ if (range && (kIOMemoryAsReference & flags))
+ IODelete(range, IOAddressRange, 1);
}
/*
void IOBufferMemoryDescriptor::setLength(vm_size_t length)
{
assert(length <= _capacity);
+ if (length > _capacity) return;
_length = length;
- _singleRange.v.length = length;
+ _ranges.v64->length = length;
}
/*
*/
void IOBufferMemoryDescriptor::setDirection(IODirection direction)
{
- _direction = direction;
+ _flags = (_flags & ~kIOMemoryDirectionMask) | direction;
+#ifndef __LP64__
+ _direction = (IODirection) (_flags & kIOMemoryDirectionMask);
+#endif /* !__LP64__ */
}
/*
bool
IOBufferMemoryDescriptor::appendBytes(const void * bytes, vm_size_t withLength)
{
- vm_size_t actualBytesToCopy = min(withLength, _capacity - _length);
+ vm_size_t actualBytesToCopy = min(withLength, _capacity - _length);
+ IOByteCount offset;
assert(_length <= _capacity);
- bcopy(/* from */ bytes, (void *)(_singleRange.v.address + _length),
- actualBytesToCopy);
+
+ offset = _length;
_length += actualBytesToCopy;
- _singleRange.v.length += actualBytesToCopy;
+ _ranges.v64->length += actualBytesToCopy;
+
+ if (_task == kernel_task)
+ bcopy(/* from */ bytes, (void *)(_ranges.v64->address + offset),
+ actualBytesToCopy);
+ else
+ writeBytes(offset, bytes, actualBytesToCopy);
return true;
}
*/
void * IOBufferMemoryDescriptor::getBytesNoCopy()
{
- return (void *)_singleRange.v.address;
+ if (kIOMemoryTypePhysical64 == (_flags & kIOMemoryTypeMask))
+ return _buffer;
+ else
+ return (void *)_ranges.v64->address;
}
+
/*
* getBytesNoCopy:
*
void *
IOBufferMemoryDescriptor::getBytesNoCopy(vm_size_t start, vm_size_t withLength)
{
- if (start < _length && (start + withLength) <= _length)
- return (void *)(_singleRange.v.address + start);
+ IOVirtualAddress address;
+
+ if ((start + withLength) < start) return 0;
+
+ if (kIOMemoryTypePhysical64 == (_flags & kIOMemoryTypeMask))
+ address = (IOVirtualAddress) _buffer;
+ else
+ address = _ranges.v64->address;
+
+ if (start < _length && (start + withLength) <= _length)
+ return (void *)(address + start);
return 0;
}
-OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 0);
+#ifndef __LP64__
+void * IOBufferMemoryDescriptor::getVirtualSegment(IOByteCount offset,
+ IOByteCount * lengthOfSegment)
+{
+ void * bytes = getBytesNoCopy(offset, 0);
+
+ if (bytes && lengthOfSegment)
+ *lengthOfSegment = _length - offset;
+
+ return bytes;
+}
+#endif /* !__LP64__ */
+
+#ifdef __LP64__
+OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 0);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 1);
+#else /* !__LP64__ */
+OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 0);
+OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 1);
+#endif /* !__LP64__ */
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 2);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 3);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 4);
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