xnu-6153.121.1.tar.gz

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

diff --git a/iokit/Kernel/IOBufferMemoryDescriptor.cpp b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
index bca55b5354cd0ad928748386efb2d7956fa62e67..29437390a86be7ffe4ecd6a4144a4ea53c879320 100644 (file)
--- a/iokit/Kernel/IOBufferMemoryDescriptor.cpp
+++ b/iokit/Kernel/IOBufferMemoryDescriptor.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@
  */
 


@@ -35,9 +35,24 @@
 #include <IOKit/IOMapper.h>
 #include <IOKit/IOBufferMemoryDescriptor.h>
 #include <libkern/OSDebug.h>
 #include <IOKit/IOMapper.h>
 #include <IOKit/IOBufferMemoryDescriptor.h>
 #include <libkern/OSDebug.h>

+#include <mach/mach_vm.h>

 
 #include "IOKitKernelInternal.h"
 
 #include "IOKitKernelInternal.h"

-#include "IOCopyMapper.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);
 
 __BEGIN_DECLS
 void ipc_port_release_send(ipc_port_t port);


@@ -47,383 +62,431 @@ __END_DECLS
 
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 

-enum
-{
-    kInternalFlagRealloc = 0x00000001,
+enum{
+       kInternalFlagPhysical      = 0x00000001,
+       kInternalFlagPageSized     = 0x00000002,
+       kInternalFlagPageAllocated = 0x00000004,
+       kInternalFlagInit          = 0x00000008

 };
 
 };
 

-volatile ppnum_t gIOHighestAllocatedPage;
-

 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 #define super IOGeneralMemoryDescriptor
 OSDefineMetaClassAndStructors(IOBufferMemoryDescriptor,
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 #define super IOGeneralMemoryDescriptor
 OSDefineMetaClassAndStructors(IOBufferMemoryDescriptor,

-                               IOGeneralMemoryDescriptor);
+    IOGeneralMemoryDescriptor);
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+static uintptr_t
+IOBMDPageProc(iopa_t * a)
+{
+       kern_return_t kr;
+       vm_address_t  vmaddr  = 0;
+       int           options = 0;// KMA_LOMEM;
+
+       kr = kernel_memory_allocate(kernel_map, &vmaddr,
+           page_size, 0, options, VM_KERN_MEMORY_IOKIT);
+
+       if (KERN_SUCCESS != kr) {
+               vmaddr = 0;
+       } else {
+               bzero((void *) vmaddr, page_size);
+       }
+
+       return (uintptr_t) vmaddr;
+}

 
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 #ifndef __LP64__
 
 /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
 
 #ifndef __LP64__

-bool IOBufferMemoryDescriptor::initWithOptions(
-                               IOOptionBits options,
-                               vm_size_t    capacity,
-                               vm_offset_t  alignment,
-                              task_t       inTask)
+bool
+IOBufferMemoryDescriptor::initWithOptions(
+       IOOptionBits options,
+       vm_size_t    capacity,
+       vm_offset_t  alignment,
+       task_t       inTask)

 {
 {

-    mach_vm_address_t physicalMask = 0;
-    return (initWithPhysicalMask(inTask, options, capacity, alignment, physicalMask));
+       mach_vm_address_t physicalMask = 0;
+       return initWithPhysicalMask(inTask, options, capacity, alignment, physicalMask);

 }
 #endif /* !__LP64__ */
 
 }
 #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)
+IOBufferMemoryDescriptor *
+IOBufferMemoryDescriptor::withCopy(
+       task_t                inTask,
+       IOOptionBits      options,
+       vm_map_t              sourceMap,
+       mach_vm_address_t source,
+       mach_vm_size_t    size)
+{
+       IOBufferMemoryDescriptor * inst;
+       kern_return_t              err;
+       vm_map_copy_t              copy;
+       vm_map_address_t           address;
+
+       copy = NULL;
+       do {
+               err = kIOReturnNoMemory;
+               inst = new IOBufferMemoryDescriptor;
+               if (!inst) {
+                       break;
+               }
+               inst->_ranges.v64 = IONew(IOAddressRange, 1);
+               if (!inst->_ranges.v64) {
+                       break;
+               }
+
+               err = vm_map_copyin(sourceMap, source, size,
+                   false /* src_destroy */, &copy);
+               if (KERN_SUCCESS != err) {
+                       break;
+               }
+
+               err = vm_map_copyout(get_task_map(inTask), &address, copy);
+               if (KERN_SUCCESS != err) {
+                       break;
+               }
+               copy = NULL;
+
+               inst->_ranges.v64->address = address;
+               inst->_ranges.v64->length  = size;
+
+               if (!inst->initWithPhysicalMask(inTask, options, size, page_size, 0)) {
+                       err = kIOReturnError;
+               }
+       } while (false);
+
+       if (KERN_SUCCESS == err) {
+               return inst;
+       }
+
+       if (copy) {
+               vm_map_copy_discard(copy);
+       }
+       OSSafeReleaseNULL(inst);
+       return NULL;
+}
+
+
+bool
+IOBufferMemoryDescriptor::initWithPhysicalMask(
+       task_t            inTask,
+       IOOptionBits      options,
+       mach_vm_size_t    capacity,
+       mach_vm_address_t alignment,
+       mach_vm_address_t physicalMask)

 {
 {

-    kern_return_t      kr;
-    task_t             mapTask = NULL;
-    vm_map_t           vmmap = NULL;
-    addr64_t            lastIOAddr;
-    mach_vm_address_t   highestMask = 0;
-    bool               usePhys;
-    IOOptionBits       iomdOptions = kIOMemoryTypeVirtual64 | kIOMemoryAsReference;
-
-    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;
-
-    // Grab IOMD bits from the Buffer MD options
-    iomdOptions  |= (options & kIOBufferDescriptorMemoryFlags);
-
-    if (physicalMask && (alignment <= 1))
-    {
-       alignment   = ((physicalMask ^ (-1ULL)) & (physicalMask - 1));
-       highestMask = (physicalMask | alignment);
-       alignment++;
-    }
-
-    if ((options & (kIOMemorySharingTypeMask | kIOMapCacheMask)) && (alignment < page_size))
-       alignment = page_size;
-
-    if (alignment >= page_size)
-       capacity = round_page(capacity);
-
-    if (alignment > page_size)
-       options |= kIOMemoryPhysicallyContiguous;
-
-    _alignment = alignment;
-
-    if ((inTask != kernel_task) && !(options & kIOMemoryPageable))
-       return false;
-
-    if ((options & kIOMemoryPhysicallyContiguous) && !physicalMask)
-       physicalMask = 0xFFFFFFFF;
-
-    // set flags for entry + object create
-    vm_prot_t memEntryCacheMode = VM_PROT_READ | VM_PROT_WRITE;
-
-    // set memory entry cache mode
-    switch (options & kIOMapCacheMask)
-    {
-       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;
-    }
-
-    if (options & kIOMemoryPageable)
-    {
-       iomdOptions |= kIOMemoryBufferPageable;
-
-       // must create the entry before any pages are allocated
-
-       // set flags for entry + object create
-       memEntryCacheMode |= MAP_MEM_NAMED_CREATE;
-
-       if (options & kIOMemoryPurgeable)
-           memEntryCacheMode |= MAP_MEM_PURGABLE;
-    }
-    else
-    {
-       memEntryCacheMode |= MAP_MEM_NAMED_REUSE;
-
-       if (IOMapper::gSystem)
-           // assuming mapped space is 2G
-           lastIOAddr = (1UL << 31) - PAGE_SIZE;
-       else
-           lastIOAddr = ptoa_64(gIOHighestAllocatedPage);
-
-       usePhys = (highestMask && (lastIOAddr != (lastIOAddr & highestMask))
-                   && (alignment <= page_size));
-
-       if (!usePhys && (options & kIOMemoryPhysicallyContiguous))
-       {
-           _buffer = (void *) IOKernelAllocateContiguous(capacity, highestMask, alignment);
-           usePhys = (NULL == _buffer);
-       }
-       if (usePhys)
-       {
-           mach_vm_address_t address;
-           iomdOptions &= ~kIOMemoryTypeVirtual64;
-           iomdOptions |= kIOMemoryTypePhysical64;
-
-           address = IOMallocPhysical(capacity, highestMask);
-           _buffer = (void *) address;
-           if (!_buffer)
+       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                  withCopy = false;
+       bool                  needZero;
+
+       if (!capacity) {

                return false;
                return false;

+       }
+
+       _options          = options;
+       _capacity         = capacity;
+       _internalFlags    = 0;
+       _internalReserved = 0;
+       _buffer           = NULL;
+
+       if (!_ranges.v64) {
+               _ranges.v64 = IONew(IOAddressRange, 1);
+               if (!_ranges.v64) {
+                       return false;
+               }
+               _ranges.v64->address = 0;
+               _ranges.v64->length  = 0;
+       } else {
+               if (!_ranges.v64->address) {
+                       return false;
+               }
+               if (!(kIOMemoryPageable & options)) {
+                       return false;
+               }
+               if (!inTask) {
+                       return false;
+               }
+               _buffer = (void *) _ranges.v64->address;
+               withCopy = true;
+       }
+       //  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 = (NULL != IOMapper::gSystem);
+       }
+       needZero = (mapped || (0 != (kIOMemorySharingTypeMask & options)));
+
+       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);
+       }
+
+       if (alignment > page_size) {
+               options |= kIOMemoryPhysicallyContiguous;
+       }
+
+       _alignment = alignment;

 
 

-           mapTask = inTask;
-           inTask = 0;
-       }
-       else
-       {
-           vmmap = kernel_map;
-
-           // Buffer shouldn't 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)
-           {
-               // attempted allocate already
-           }
-           else if (alignment > 1)
-           {
-               _buffer = IOMallocAligned(capacity, alignment);
-           }
-           else
-           {
-               _buffer = IOMalloc(capacity);
-           }
-           if (!_buffer)
+       if ((capacity + alignment) < _capacity) {

                return false;
        }
                return false;
        }

-    }

 
 

-    if( (kIOMemoryTypePhysical64 != (kIOMemoryTypeMask & iomdOptions)) 
-       && (options & (kIOMemoryPageable | kIOMapCacheMask))) {
-       ipc_port_t      sharedMem;
-       vm_size_t       size = round_page(capacity);
+       if ((inTask != kernel_task) && !(options & kIOMemoryPageable)) {
+               return false;
+       }

 
 

-       kr = mach_make_memory_entry(vmmap,
-                                   &size, (vm_offset_t)_buffer,
-                                   memEntryCacheMode, &sharedMem,
-                                   NULL );
+       bzero(&mapSpec, sizeof(mapSpec));
+       mapSpec.alignment      = _alignment;
+       mapSpec.numAddressBits = 64;
+       if (highestMask && mapped) {
+               if (highestMask <= 0xFFFFFFFF) {
+                       mapSpec.numAddressBits = (32 - __builtin_clz((unsigned int) highestMask));
+               } else {
+                       mapSpec.numAddressBits = (64 - __builtin_clz((unsigned int) (highestMask >> 32)));
+               }
+               highestMask = 0;
+       }

 
 

-       if( (KERN_SUCCESS == kr) && (size != round_page(capacity))) {
-           ipc_port_release_send( sharedMem );
-           kr = kIOReturnVMError;
+       // 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;
+
+               // Buffer shouldn't 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. */
+
+               bool contig = (0 != (options & kIOMemoryHostPhysicallyContiguous));
+
+               if (!contig && (0 != (options & kIOMemoryPhysicallyContiguous))) {
+                       contig |= (!mapped);
+                       contig |= (0 != (kIOMemoryMapperNone & options));
+#if 0
+                       // treat kIOMemoryPhysicallyContiguous as kIOMemoryHostPhysicallyContiguous for now
+                       contig |= true;
+#endif
+               }
+
+               if (contig || highestMask || (alignment > page_size)) {
+                       _internalFlags |= kInternalFlagPhysical;
+                       if (highestMask) {
+                               _internalFlags |= kInternalFlagPageSized;
+                               capacity = round_page(capacity);
+                       }
+                       _buffer = (void *) IOKernelAllocateWithPhysicalRestrict(
+                               capacity, highestMask, alignment, contig);
+               } 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
+                               OSAddAtomic(capacity, &debug_iomalloc_size);
+#endif
+                       }
+               } else if (alignment > 1) {
+                       _buffer = IOMallocAligned(capacity, alignment);
+               } else {
+                       _buffer = IOMalloc(capacity);
+               }
+               if (!_buffer) {
+                       return false;
+               }
+               if (needZero) {
+                       bzero(_buffer, capacity);
+               }

        }
        }

-       if( KERN_SUCCESS != kr)
-           return( false );

 
 

-       _memEntry = (void *) sharedMem;
+       if ((options & (kIOMemoryPageable | kIOMapCacheMask))) {
+               vm_size_t       size = round_page(capacity);
+
+               // initWithOptions will create memory entry
+               if (!withCopy) {
+                       iomdOptions |= kIOMemoryPersistent;
+               }

 
 

-       if( options & kIOMemoryPageable) {
+               if (options & kIOMemoryPageable) {

 #if IOALLOCDEBUG
 #if IOALLOCDEBUG

-           debug_iomallocpageable_size += size;
+                       OSAddAtomicLong(size, &debug_iomallocpageable_size);

 #endif
 #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)
-           {
-               *startAddr;
-               startAddr += page_size;
-           }
-       }
-    }
-
-    _ranges.v64->address = (mach_vm_address_t) _buffer;;
-    _ranges.v64->length  = _capacity;
-
-    if (!super::initWithOptions(_ranges.v64, 1, 0,
-                               inTask, iomdOptions, /* System mapper */ 0))
-       return false;
-
-    if (highestMask && !IOMapper::gSystem)
-    {
-       IOMDDMACharacteristics mdSummary;
-
-       bzero(&mdSummary, sizeof(mdSummary));
-       IOReturn rtn = dmaCommandOperation(
-               kIOMDGetCharacteristics,
-               &mdSummary, sizeof(mdSummary));
-       if (rtn)
-           return false;
-
-       if (mdSummary.fHighestPage)
-       {
-           ppnum_t highest;
-           while (mdSummary.fHighestPage > (highest = gIOHighestAllocatedPage))
-           {
-               if (OSCompareAndSwap(highest, mdSummary.fHighestPage, 
-                                       (UInt32 *) &gIOHighestAllocatedPage))
-                   break;
-           }
-           lastIOAddr = ptoa_64(mdSummary.fHighestPage);
-       }
-       else
-           lastIOAddr = ptoa_64(gIOLastPage);
-
-       if (lastIOAddr != (lastIOAddr & highestMask))
-       {
-           if (kIOMemoryTypePhysical64 != (_flags & kIOMemoryTypeMask))
-           {
-               // flag a retry
-               _internalFlags |= kInternalFlagRealloc;
-           }
-           return false;
-       }
-    }
-
-    if (mapTask)
-    {
-       if (!reserved) {
-           reserved = IONew( ExpansionData, 1 );
-           if( !reserved)
-               return( false );
-       }
-       reserved->map = createMappingInTask(mapTask, 0, 
-                           kIOMapAnywhere | (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);
-
-    return true;
+                       if (!withCopy) {
+                               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;
+                       }
+               }
+       }
+
+       _ranges.v64->address = (mach_vm_address_t) _buffer;
+       _ranges.v64->length  = _capacity;
+
+       if (!super::initWithOptions(_ranges.v64, 1, 0,
+           inTask, iomdOptions, /* System mapper */ NULL)) {
+               return false;
+       }
+
+       _internalFlags |= kInternalFlagInit;
+#if IOTRACKING
+       if (!(options & kIOMemoryPageable)) {
+               trackingAccumSize(capacity);
+       }
+#endif /* IOTRACKING */
+
+       // give any system mapper the allocation params
+       if (kIOReturnSuccess != dmaCommandOperation(kIOMDAddDMAMapSpec,
+           &mapSpec, sizeof(mapSpec))) {
+               return false;
+       }
+
+       if (mapTask) {
+               if (!reserved) {
+                       reserved = IONew( ExpansionData, 1 );
+                       if (!reserved) {
+                               return false;
+                       }
+               }
+               reserved->map = createMappingInTask(mapTask, 0,
+                   kIOMapAnywhere | (options & kIOMapPrefault) | (options & kIOMapCacheMask), 0, 0);
+               if (!reserved->map) {
+                       _buffer = NULL;
+                       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);
+
+       return true;

 }
 
 }
 

-IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::inTaskWithOptions(
-                                           task_t       inTask,
-                                            IOOptionBits options,
-                                            vm_size_t    capacity,
-                                            vm_offset_t  alignment)
+IOBufferMemoryDescriptor *
+IOBufferMemoryDescriptor::inTaskWithOptions(
+       task_t       inTask,
+       IOOptionBits options,
+       vm_size_t    capacity,
+       vm_offset_t  alignment)

 {
 {

-    IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
-    
-    if (me && !me->initWithPhysicalMask(inTask, options, capacity, alignment, 0)) {
-       bool retry = (0 != (kInternalFlagRealloc & me->_internalFlags));
-       me->release();
-       me = 0;
-       if (retry)
-       {
-           me = new IOBufferMemoryDescriptor;
-           if (me && !me->initWithPhysicalMask(inTask, options, capacity, alignment, 0))
-           {
+       IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
+
+       if (me && !me->initWithPhysicalMask(inTask, options, capacity, alignment, 0)) {

                me->release();
                me->release();

-               me = 0;
-           }
+               me = NULL;
+       }
+       return me;
+}
+
+IOBufferMemoryDescriptor *
+IOBufferMemoryDescriptor::inTaskWithOptions(
+       task_t       inTask,
+       IOOptionBits options,
+       vm_size_t    capacity,
+       vm_offset_t  alignment,
+       uint32_t     kernTag,
+       uint32_t     userTag)
+{
+       IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
+
+       if (me) {
+               me->setVMTags(kernTag, userTag);
+
+               if (!me->initWithPhysicalMask(inTask, options, capacity, alignment, 0)) {
+                       me->release();
+                       me = NULL;
+               }

        }
        }

-    }
-    return me;
+       return me;

 }
 
 }
 

-IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::inTaskWithPhysicalMask(
-                                           task_t            inTask,
-                                            IOOptionBits      options,
-                                            mach_vm_size_t    capacity,
-                                            mach_vm_address_t physicalMask)
+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))
-    {
-       bool retry = (0 != (kInternalFlagRealloc & me->_internalFlags));
-       me->release();
-       me = 0;
-       if (retry)
-       {
-           me = new IOBufferMemoryDescriptor;
-           if (me && !me->initWithPhysicalMask(inTask, options, capacity, 1, physicalMask))
-           {
+       IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
+
+       if (me && !me->initWithPhysicalMask(inTask, options, capacity, 1, physicalMask)) {

                me->release();
                me->release();

-               me = 0;
-           }
+               me = NULL;

        }
        }

-    }
-    return me;
+       return me;

 }
 
 #ifndef __LP64__
 }
 
 #ifndef __LP64__

-bool IOBufferMemoryDescriptor::initWithOptions(
-                               IOOptionBits options,
-                               vm_size_t    capacity,
-                               vm_offset_t  alignment)
+bool
+IOBufferMemoryDescriptor::initWithOptions(
+       IOOptionBits options,
+       vm_size_t    capacity,
+       vm_offset_t  alignment)

 {
 {

-    return (initWithPhysicalMask(kernel_task, options, capacity, alignment, (mach_vm_address_t)0));
+       return initWithPhysicalMask(kernel_task, options, capacity, alignment, (mach_vm_address_t)0);

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

-IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::withOptions(
-                                            IOOptionBits options,
-                                            vm_size_t    capacity,
-                                            vm_offset_t  alignment)
+IOBufferMemoryDescriptor *
+IOBufferMemoryDescriptor::withOptions(
+       IOOptionBits options,
+       vm_size_t    capacity,
+       vm_offset_t  alignment)

 {
 {

-    IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
-    
-    if (me && !me->initWithPhysicalMask(kernel_task, options, capacity, alignment, 0)) {
-       bool retry = (0 != (kInternalFlagRealloc & me->_internalFlags));
-       me->release();
-       me = 0;
-       if (retry)
-       {
-           me = new IOBufferMemoryDescriptor;
-           if (me && !me->initWithPhysicalMask(kernel_task, options, capacity, alignment, 0))
-           {
+       IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
+
+       if (me && !me->initWithPhysicalMask(kernel_task, options, capacity, alignment, 0)) {

                me->release();
                me->release();

-               me = 0;
-           }
+               me = NULL;

        }
        }

-    }
-    return me;
+       return me;

 }
 
 
 }
 
 


@@ -435,13 +498,13 @@ IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::withOptions(
  */
 IOBufferMemoryDescriptor *
 IOBufferMemoryDescriptor::withCapacity(vm_size_t   inCapacity,
  */
 IOBufferMemoryDescriptor *
 IOBufferMemoryDescriptor::withCapacity(vm_size_t   inCapacity,

-                                       IODirection inDirection,
-                                       bool        inContiguous)
+    IODirection inDirection,
+    bool        inContiguous)

 {
 {

-    return( IOBufferMemoryDescriptor::withOptions(
-               inDirection | kIOMemoryUnshared
-                | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
-               inCapacity, inContiguous ? inCapacity : 1 ));
+       return IOBufferMemoryDescriptor::withOptions(
+               inDirection | kIOMemoryUnshared
+               | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
+               inCapacity, inContiguous ? inCapacity : 1 );

 }
 
 #ifndef __LP64__
 }
 
 #ifndef __LP64__


@@ -451,23 +514,26 @@ IOBufferMemoryDescriptor::withCapacity(vm_size_t   inCapacity,
  * Initialize a new IOBufferMemoryDescriptor preloaded with bytes (copied).
  * The descriptor's length and capacity are set to the input buffer's size.
  */
  * Initialize a new IOBufferMemoryDescriptor preloaded with bytes (copied).
  * The descriptor's length and capacity are set to the input buffer's size.
  */

-bool IOBufferMemoryDescriptor::initWithBytes(const void * inBytes,
-                                             vm_size_t    inLength,
-                                             IODirection  inDirection,
-                                             bool         inContiguous)
+bool
+IOBufferMemoryDescriptor::initWithBytes(const void * inBytes,
+    vm_size_t    inLength,
+    IODirection  inDirection,
+    bool         inContiguous)

 {
 {

-    if (!initWithPhysicalMask(kernel_task, inDirection | kIOMemoryUnshared
-                             | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
-                             inLength, inLength, (mach_vm_address_t)0))
-        return false;
+       if (!initWithPhysicalMask(kernel_task, inDirection | kIOMemoryUnshared
+           | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
+           inLength, inLength, (mach_vm_address_t)0)) {
+               return false;
+       }

 
 

-    // start out with no data
-    setLength(0);
+       // start out with no data
+       setLength(0);

 
 

-    if (!appendBytes(inBytes, inLength))
-        return false;
+       if (!appendBytes(inBytes, inLength)) {
+               return false;
+       }

 
 

-    return true;
+       return true;

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


@@ -479,47 +545,30 @@ bool IOBufferMemoryDescriptor::initWithBytes(const void * inBytes,
  */
 IOBufferMemoryDescriptor *
 IOBufferMemoryDescriptor::withBytes(const void * inBytes,
  */
 IOBufferMemoryDescriptor *
 IOBufferMemoryDescriptor::withBytes(const void * inBytes,

-                                    vm_size_t    inLength,
-                                    IODirection  inDirection,
-                                    bool         inContiguous)
+    vm_size_t    inLength,
+    IODirection  inDirection,
+    bool         inContiguous)

 {
 {

-    IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
-
-    if (me && !me->initWithPhysicalMask(
-               kernel_task, inDirection | kIOMemoryUnshared
-                | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
-               inLength, inLength, 0 ))
-    {
-       bool retry = (0 != (kInternalFlagRealloc & me->_internalFlags));
-       me->release();
-       me = 0;
-       if (retry)
-       {
-           me = new IOBufferMemoryDescriptor;
-           if (me && !me->initWithPhysicalMask(
-                  kernel_task, inDirection | kIOMemoryUnshared
-                   | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
-                  inLength, inLength, 0 ))
-           {
+       IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
+
+       if (me && !me->initWithPhysicalMask(
+                   kernel_task, inDirection | kIOMemoryUnshared
+                   | (inContiguous ? kIOMemoryPhysicallyContiguous : 0),
+                   inLength, inLength, 0 )) {

                me->release();
                me->release();

-               me = 0;
-           }
+               me = NULL;

        }
 
        }
 

-    }
+       if (me) {
+               // start out with no data
+               me->setLength(0);

 
 

-    if (me)
-    {
-       // start out with no data
-       me->setLength(0);
-
-       if (!me->appendBytes(inBytes, inLength))
-       {
-           me->release();
-           me = 0;
+               if (!me->appendBytes(inBytes, inLength)) {
+                       me->release();
+                       me = NULL;
+               }

        }
        }

-    }
-    return me;
+       return me;

 }
 
 /*
 }
 
 /*


@@ -527,52 +576,74 @@ IOBufferMemoryDescriptor::withBytes(const void * inBytes,
  *
  * Free resources
  */
  *
  * Free resources
  */

-void IOBufferMemoryDescriptor::free()
+void
+IOBufferMemoryDescriptor::free()

 {
 {

-    // Cache all of the relevant information on the stack for use
-    // after we call super::free()!
-    IOOptionBits     flags     = _flags;
-    IOOptionBits     options   = _options;
-    vm_size_t        size      = _capacity;
-    void *           buffer    = _buffer;
-    IOMemoryMap *    map       = 0;
-    IOAddressRange * range     = _ranges.v64;
-    mach_vm_address_t source   = range ? range->address : 0;
-    vm_offset_t      alignment = _alignment;
-
-    if (alignment >= page_size)
-       size = round_page(size);
-
-    if (reserved)
-    {
-       map = reserved->map;
-        IODelete( reserved, ExpansionData, 1 );
-       if (map)
-           map->release();
-    }
-
-    /* super::free may unwire - deallocate buffer afterwards */
-    super::free();
-
-    if (options & kIOMemoryPageable)
-    {
+       // Cache all of the relevant information on the stack for use
+       // after we call super::free()!
+       IOOptionBits     flags         = _flags;
+       IOOptionBits     internalFlags = _internalFlags;
+       IOOptionBits     options   = _options;
+       vm_size_t        size      = _capacity;
+       void *           buffer    = _buffer;
+       IOMemoryMap *    map       = NULL;
+       IOAddressRange * range     = _ranges.v64;
+       vm_offset_t      alignment = _alignment;
+
+       if (alignment >= page_size) {
+               size = round_page(size);
+       }
+
+       if (reserved) {
+               map = reserved->map;
+               IODelete( reserved, ExpansionData, 1 );
+               if (map) {
+                       map->release();
+               }
+       }
+
+       if ((options & kIOMemoryPageable)
+           || (kInternalFlagPageSized & internalFlags)) {
+               size = round_page(size);
+       }
+
+#if IOTRACKING
+       if (!(options & kIOMemoryPageable)
+           && buffer
+           && (kInternalFlagInit & _internalFlags)) {
+               trackingAccumSize(-size);
+       }
+#endif /* IOTRACKING */
+
+       /* super::free may unwire - deallocate buffer afterwards */
+       super::free();
+
+       if (options & kIOMemoryPageable) {

 #if IOALLOCDEBUG
 #if IOALLOCDEBUG

-       debug_iomallocpageable_size -= round_page(size);
+               OSAddAtomicLong(-size, &debug_iomallocpageable_size);

 #endif
 #endif

-    }
-    else if (buffer)
-    {
-       if (kIOMemoryTypePhysical64 == (flags & kIOMemoryTypeMask))
-           IOFreePhysical(source, size);
-        else if (options & kIOMemoryPhysicallyContiguous)
-            IOKernelFreeContiguous((mach_vm_address_t) buffer, size);
-        else if (alignment > 1)
-            IOFreeAligned(buffer, size);
-        else
-            IOFree(buffer, size);
-    }
-    if (range && (kIOMemoryAsReference & flags))
-       IODelete(range, IOAddressRange, 1);
+       } else if (buffer) {
+               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 (range && (kIOMemoryAsReference & flags)) {
+               IODelete(range, IOAddressRange, 1);
+       }

 }
 
 /*
 }
 
 /*


@@ -580,9 +651,10 @@ void IOBufferMemoryDescriptor::free()
  *
  * Get the buffer capacity
  */
  *
  * Get the buffer capacity
  */

-vm_size_t IOBufferMemoryDescriptor::getCapacity() const
+vm_size_t
+IOBufferMemoryDescriptor::getCapacity() const

 {
 {

-    return _capacity;
+       return _capacity;

 }
 
 /*
 }
 
 /*


@@ -595,12 +667,16 @@ vm_size_t IOBufferMemoryDescriptor::getCapacity() const
  * can reuse an existing one, even for different transfer sizes).   Note
  * that the specified length must not exceed the capacity of the buffer.
  */
  * can reuse an existing one, even for different transfer sizes).   Note
  * that the specified length must not exceed the capacity of the buffer.
  */

-void IOBufferMemoryDescriptor::setLength(vm_size_t length)
+void
+IOBufferMemoryDescriptor::setLength(vm_size_t length)

 {
 {

-    assert(length <= _capacity);
+       assert(length <= _capacity);
+       if (length > _capacity) {
+               return;
+       }

 
 

-    _length = length;
-    _ranges.v64->length = length;
+       _length = length;
+       _ranges.v64->length = length;

 }
 
 /*
 }
 
 /*


@@ -610,11 +686,12 @@ void IOBufferMemoryDescriptor::setLength(vm_size_t length)
  * the descriptor's transfer direction.  This eliminates the need to destroy
  * and create new buffers when different transfer directions are needed.
  */
  * the descriptor's transfer direction.  This eliminates the need to destroy
  * and create new buffers when different transfer directions are needed.
  */

-void IOBufferMemoryDescriptor::setDirection(IODirection direction)
+void
+IOBufferMemoryDescriptor::setDirection(IODirection direction)

 {
 {

-    _flags = (_flags & ~kIOMemoryDirectionMask) | direction;
+       _flags = (_flags & ~kIOMemoryDirectionMask) | direction;

 #ifndef __LP64__
 #ifndef __LP64__

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

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


@@ -628,22 +705,23 @@ void IOBufferMemoryDescriptor::setDirection(IODirection direction)
 bool
 IOBufferMemoryDescriptor::appendBytes(const void * bytes, vm_size_t withLength)
 {
 bool
 IOBufferMemoryDescriptor::appendBytes(const void * bytes, vm_size_t withLength)
 {

-    vm_size_t   actualBytesToCopy = min(withLength, _capacity - _length);
-    IOByteCount offset;
+       vm_size_t   actualBytesToCopy = min(withLength, _capacity - _length);
+       IOByteCount offset;

 
 

-    assert(_length <= _capacity);
+       assert(_length <= _capacity);

 
 

-    offset = _length;
-    _length += actualBytesToCopy;
-    _ranges.v64->length += actualBytesToCopy;
+       offset = _length;
+       _length += actualBytesToCopy;
+       _ranges.v64->length += actualBytesToCopy;

 
 

-    if (_task == kernel_task)
-       bcopy(/* from */ bytes, (void *)(_ranges.v64->address + offset),
-             actualBytesToCopy);
-    else
-       writeBytes(offset, bytes, actualBytesToCopy);
+       if (_task == kernel_task) {
+               bcopy(/* from */ bytes, (void *)(_ranges.v64->address + offset),
+                   actualBytesToCopy);
+       } else {
+               writeBytes(offset, bytes, actualBytesToCopy);
+       }

 
 

-    return true;
+       return true;

 }
 
 /*
 }
 
 /*


@@ -651,12 +729,14 @@ IOBufferMemoryDescriptor::appendBytes(const void * bytes, vm_size_t withLength)
  *
  * Return the virtual address of the beginning of the buffer
  */
  *
  * Return the virtual address of the beginning of the buffer
  */

-void * IOBufferMemoryDescriptor::getBytesNoCopy()
+void *
+IOBufferMemoryDescriptor::getBytesNoCopy()

 {
 {

-    if (kIOMemoryTypePhysical64 == (_flags & kIOMemoryTypeMask))
-       return _buffer;
-    else
-       return (void *)_ranges.v64->address;
+       if (kIOMemoryTypePhysical64 == (_flags & kIOMemoryTypeMask)) {
+               return _buffer;
+       } else {
+               return (void *)_ranges.v64->address;
+       }

 }
 
 
 }
 
 


@@ -668,27 +748,36 @@ void * IOBufferMemoryDescriptor::getBytesNoCopy()
 void *
 IOBufferMemoryDescriptor::getBytesNoCopy(vm_size_t start, vm_size_t withLength)
 {
 void *
 IOBufferMemoryDescriptor::getBytesNoCopy(vm_size_t start, vm_size_t withLength)
 {

-    IOVirtualAddress address;
-    if (kIOMemoryTypePhysical64 == (_flags & kIOMemoryTypeMask))
-       address = (IOVirtualAddress) _buffer;
-    else
-       address = _ranges.v64->address;
-
-   if (start < _length && (start + withLength) <= _length)
-        return (void *)(address + start);
-    return 0;
+       IOVirtualAddress address;
+
+       if ((start + withLength) < start) {
+               return NULL;
+       }
+
+       if (kIOMemoryTypePhysical64 == (_flags & kIOMemoryTypeMask)) {
+               address = (IOVirtualAddress) _buffer;
+       } else {
+               address = _ranges.v64->address;
+       }
+
+       if (start < _length && (start + withLength) <= _length) {
+               return (void *)(address + start);
+       }
+       return NULL;

 }
 
 #ifndef __LP64__
 }
 
 #ifndef __LP64__

-void * IOBufferMemoryDescriptor::getVirtualSegment(IOByteCount offset,
-                                                       IOByteCount * lengthOfSegment)
+void *
+IOBufferMemoryDescriptor::getVirtualSegment(IOByteCount offset,
+    IOByteCount * lengthOfSegment)

 {
 {

-    void * bytes = getBytesNoCopy(offset, 0);
-    
-    if (bytes && lengthOfSegment)
-       *lengthOfSegment = _length - offset;
+       void * bytes = getBytesNoCopy(offset, 0);
+
+       if (bytes && lengthOfSegment) {
+               *lengthOfSegment = _length - offset;
+       }

 
 

-    return bytes;
+       return bytes;

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