X-Git-Url: https://git.saurik.com/apple/xnu.git/blobdiff_plain/91447636331957f3d9b5ca5b508f07c526b0074d..813fb2f63a553c957e917ede5f119b021d6ce391:/iokit/Kernel/IOBufferMemoryDescriptor.cpp diff --git a/iokit/Kernel/IOBufferMemoryDescriptor.cpp b/iokit/Kernel/IOBufferMemoryDescriptor.cpp index 337c16895..5641d3b9e 100644 --- a/iokit/Kernel/IOBufferMemoryDescriptor.cpp +++ b/iokit/Kernel/IOBufferMemoryDescriptor.cpp @@ -1,236 +1,324 @@ /* * 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@ */ + +#define _IOMEMORYDESCRIPTOR_INTERNAL_ + #include #include #include +#include #include +#include +#include #include "IOKitKernelInternal.h" +#ifdef IOALLOCDEBUG +#include +#endif +#include + +#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_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; } @@ -242,20 +330,38 @@ IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::inTaskWithOptions( { 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, @@ -264,7 +370,7 @@ IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::withOptions( { 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; } @@ -289,6 +395,7 @@ IOBufferMemoryDescriptor::withCapacity(vm_size_t inCapacity, inCapacity, inContiguous ? inCapacity : 1 )); } +#ifndef __LP64__ /* * initWithBytes: * @@ -300,10 +407,9 @@ bool IOBufferMemoryDescriptor::initWithBytes(const void * inBytes, 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 @@ -314,6 +420,7 @@ bool IOBufferMemoryDescriptor::initWithBytes(const void * inBytes, return true; } +#endif /* !__LP64__ */ /* * withBytes: @@ -329,9 +436,25 @@ IOBufferMemoryDescriptor::withBytes(const void * inBytes, { 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; } @@ -345,16 +468,24 @@ void IOBufferMemoryDescriptor::free() { // 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 */ @@ -363,28 +494,41 @@ void IOBufferMemoryDescriptor::free() 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); } /* @@ -410,9 +554,10 @@ vm_size_t IOBufferMemoryDescriptor::getCapacity() const void IOBufferMemoryDescriptor::setLength(vm_size_t length) { assert(length <= _capacity); + if (length > _capacity) return; _length = length; - _singleRange.v.length = length; + _ranges.v64->length = length; } /* @@ -424,7 +569,10 @@ void IOBufferMemoryDescriptor::setLength(vm_size_t length) */ void IOBufferMemoryDescriptor::setDirection(IODirection direction) { - _direction = direction; + _flags = (_flags & ~kIOMemoryDirectionMask) | direction; +#ifndef __LP64__ + _direction = (IODirection) (_flags & kIOMemoryDirectionMask); +#endif /* !__LP64__ */ } /* @@ -437,13 +585,20 @@ void IOBufferMemoryDescriptor::setDirection(IODirection direction) 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; } @@ -455,9 +610,13 @@ IOBufferMemoryDescriptor::appendBytes(const void * bytes, vm_size_t withLength) */ void * IOBufferMemoryDescriptor::getBytesNoCopy() { - return (void *)_singleRange.v.address; + if (kIOMemoryTypePhysical64 == (_flags & kIOMemoryTypeMask)) + return _buffer; + else + return (void *)_ranges.v64->address; } + /* * getBytesNoCopy: * @@ -466,13 +625,40 @@ void * IOBufferMemoryDescriptor::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);