xnu-1699.24.23.tar.gz

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

diff --git a/iokit/Kernel/IOBufferMemoryDescriptor.cpp b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
index c209c70356e04857368c3817a64031f09905df37..563059600b59c1a31850aaf736144e55bde62402 100644 (file)
--- a/iokit/Kernel/IOBufferMemoryDescriptor.cpp
+++ b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
@@ -1,176 +1,332 @@
 /*
  * Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
  *
 /*
  * 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,
  * 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 <IOKit/assert.h>
 #include <IOKit/system.h>
 
 #include <IOKit/IOLib.h>
 #include <IOKit/assert.h>
 #include <IOKit/system.h>
 
 #include <IOKit/IOLib.h>

+#include <IOKit/IOMapper.h>

 #include <IOKit/IOBufferMemoryDescriptor.h>
 #include <IOKit/IOBufferMemoryDescriptor.h>

+#include <libkern/OSDebug.h>
+
+#include "IOKitKernelInternal.h"

 
 __BEGIN_DECLS
 void ipc_port_release_send(ipc_port_t port);
 
 __BEGIN_DECLS
 void ipc_port_release_send(ipc_port_t port);

-__END_DECLS
-
-extern "C" vm_map_t IOPageableMapForAddress( vm_address_t address );
+#include <vm/pmap.h>

 
 

-#define super IOGeneralMemoryDescriptor
-OSDefineMetaClassAndStructors(IOBufferMemoryDescriptor,
-                               IOGeneralMemoryDescriptor);
+__END_DECLS

 
 

-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      */ )
+enum

 {
 {

-    return false;
-}
+    kInternalFlagPhysical  = 0x00000001,
+    kInternalFlagPageSized = 0x00000002
+};

 
 

-bool IOBufferMemoryDescriptor::initWithPhysicalAddress(
-                                  IOPhysicalAddress /* address       */ ,
-                                  IOByteCount       /* withLength    */ ,
-                                  IODirection       /* withDirection */ )
-{
-    return false;
-}
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

 
 

-bool IOBufferMemoryDescriptor::initWithPhysicalRanges(
-                                  IOPhysicalRange * /* ranges        */ ,
-                                  UInt32            /* withCount     */ ,
-                                  IODirection       /* withDirection */ ,
-                                  bool              /* asReference   */ )
-{
-    return false;
-}
+#define super IOGeneralMemoryDescriptor
+OSDefineMetaClassAndStructors(IOBufferMemoryDescriptor,
+                               IOGeneralMemoryDescriptor);

 
 

-bool IOBufferMemoryDescriptor::initWithRanges(
-                                  IOVirtualRange * /* ranges        */ ,
-                                  UInt32           /* withCount     */ ,
-                                  IODirection      /* withDirection */ ,
-                                  task_t           /* withTask      */ ,
-                                  bool             /* asReference   */ )
-{
-    return false;
-}
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

 
 

+#ifndef __LP64__

 bool IOBufferMemoryDescriptor::initWithOptions(
                                IOOptionBits options,
                                vm_size_t    capacity,
 bool IOBufferMemoryDescriptor::initWithOptions(
                                IOOptionBits options,
                                vm_size_t    capacity,

-                               vm_offset_t  alignment)
+                               vm_offset_t  alignment,
+                              task_t       inTask)
+{
+    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)

 {
 {

+    kern_return_t      kr;
+    task_t             mapTask = NULL;
+    vm_map_t           vmmap = NULL;
+    mach_vm_address_t   highestMask = 0;
+    IOOptionBits       iomdOptions = kIOMemoryTypeVirtual64 | kIOMemoryAsReference;
+

     if (!capacity)
         return false;
 
     if (!capacity)
         return false;
 

-    _options             = options;
-    _capacity     = capacity;
-    _physAddrs    = 0;
-    _physSegCount = 0;
-    _buffer      = 0;
+    _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 (alignment < page_size)
+            alignment = page_size;
+    }
+
+    if ((options & (kIOMemorySharingTypeMask | kIOMapCacheMask | kIOMemoryClearEncrypt)) && (alignment < page_size))
+       alignment = page_size;

 
 

-    if ((options & kIOMemorySharingTypeMask) && (alignment < page_size))
-        alignment = page_size;
+    if (alignment >= page_size)
+       capacity = round_page(capacity);
+
+    if (alignment > page_size)
+       options |= kIOMemoryPhysicallyContiguous;

 
     _alignment = alignment;
 
     _alignment = alignment;

+
+    if ((inTask != kernel_task) && !(options & kIOMemoryPageable))
+       return false;
+
+    // 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)
     if (options & kIOMemoryPageable)

-        /* Allocate some kernel address space. */
-        _buffer = IOMallocPageable(capacity, alignment);
-    /* Allocate a wired-down buffer inside kernel space. */
-    else if (options & kIOMemoryPhysicallyContiguous)
-        _buffer = IOMallocContiguous(capacity, alignment, 0);
-    else if (alignment > 1)
-        _buffer = IOMallocAligned(capacity, alignment);
+    {
+       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
     else

-        _buffer = IOMalloc(capacity);
+    {
+       memEntryCacheMode |= MAP_MEM_NAMED_REUSE;
+       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) || highestMask || (alignment > page_size))
+       {
+            _internalFlags |= kInternalFlagPhysical;
+            if (highestMask)
+            {
+                _internalFlags |= kInternalFlagPageSized;
+                capacity = round_page(capacity);
+            }
+            _buffer = (void *) IOKernelAllocateWithPhysicalRestrict(capacity, highestMask, alignment, 
+                                        (0 != (options & kIOMemoryPhysicallyContiguous)));
+       }
+       else if (alignment > 1)
+       {
+            _buffer = IOMallocAligned(capacity, alignment);
+       }
+       else
+       {
+            _buffer = IOMalloc(capacity);
+       }
+
+       if (!_buffer)
+       {
+            return false;
+       }
+    }

 
 

-    if (!_buffer)
-        return false;
+    if( (options & (kIOMemoryPageable | kIOMapCacheMask))) {
+       ipc_port_t      sharedMem;
+       vm_size_t       size = round_page(capacity);
+
+       kr = mach_make_memory_entry(vmmap,
+                                   &size, (vm_offset_t)_buffer,
+                                   memEntryCacheMode, &sharedMem,
+                                   NULL );
+
+       if( (KERN_SUCCESS == kr) && (size != round_page(capacity))) {
+           ipc_port_release_send( sharedMem );
+           kr = kIOReturnVMError;
+       }
+       if( KERN_SUCCESS != kr)
+           return( false );
+
+       _memEntry = (void *) sharedMem;
+
+       if( options & kIOMemoryPageable) {
+#if IOALLOCDEBUG
+           debug_iomallocpageable_size += 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)
+           {
+               *startAddr;
+               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::initWithRanges(&_singleRange.v,        1,
-                                (IODirection) (options & kIOMemoryDirectionMask),
-                                kernel_task, true))
+    if (!super::initWithOptions(_ranges.v64, 1, 0,
+                               inTask, iomdOptions, /* System mapper */ 0))

        return false;
 
        return false;
 

-    if (options & kIOMemoryPageable) {
-        _flags |= kIOMemoryRequiresWire;
-
-        kern_return_t kr;
-        ipc_port_t sharedMem = (ipc_port_t) _memEntry;
-        vm_size_t size = _ranges.v[0].length;
-
-        // must create the entry before any pages are allocated
-        if( 0 == sharedMem) {
-            kr = mach_make_memory_entry( IOPageableMapForAddress( _ranges.v[0].address ),
-                        &size, _ranges.v[0].address,
-                        VM_PROT_READ | VM_PROT_WRITE, &sharedMem,
-                        NULL );
-            if( (KERN_SUCCESS == kr) && (size != _ranges.v[0].length)) {
-                ipc_port_release_send( sharedMem );
-                kr = kIOReturnVMError;
-            }
-            if( KERN_SUCCESS != kr)
-                sharedMem = 0;
-            _memEntry = (void *) sharedMem;
-        }
-        
-    } else {
-        /* Precompute virtual-to-physical page mappings. */
-        vm_address_t inBuffer = (vm_address_t) _buffer;
-        _physSegCount = atop(trunc_page(inBuffer + capacity - 1) -
-                            trunc_page(inBuffer)) + 1;
-        _physAddrs = IONew(IOPhysicalAddress, _physSegCount);
-        if (!_physAddrs)
-            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;
+}
+
+IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::inTaskWithOptions(
+                                           task_t       inTask,
+                                            IOOptionBits options,
+                                            vm_size_t    capacity,
+                                            vm_offset_t  alignment)
+{
+    IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;

     
     

-        inBuffer = trunc_page(inBuffer);
-        for (unsigned i = 0; i < _physSegCount; i++) {
-            _physAddrs[i] = pmap_extract(get_task_pmap(kernel_task), inBuffer);
-            assert(_physAddrs[i]); /* supposed to be wired */
-            inBuffer += page_size;
-        }
+    if (me && !me->initWithPhysicalMask(inTask, options, capacity, alignment, 0)) {
+       me->release();
+       me = 0;

     }
     }

+    return me;
+}

 
 

-    setLength(capacity);
+IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::inTaskWithPhysicalMask(
+                                           task_t            inTask,
+                                            IOOptionBits      options,
+                                            mach_vm_size_t    capacity,
+                                            mach_vm_address_t physicalMask)
+{
+    IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;

     
     

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

 }
 }

+#endif /* !__LP64__ */

 
 IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::withOptions(
                                             IOOptionBits options,
                                             vm_size_t    capacity,
 
 IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::withOptions(
                                             IOOptionBits options,
                                             vm_size_t    capacity,

-                                            vm_offset_t  alignment = 1)
+                                            vm_offset_t  alignment)

 {
     IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
     
 {
     IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
     

-    if (me && !me->initWithOptions(options, capacity, alignment)) {
+    if (me && !me->initWithPhysicalMask(kernel_task, options, capacity, alignment, 0)) {

        me->release();
        me = 0;
     }
        me->release();
        me = 0;
     }


@@ -195,6 +351,7 @@ IOBufferMemoryDescriptor::withCapacity(vm_size_t   inCapacity,
                inCapacity, inContiguous ? inCapacity : 1 ));
 }
 
                inCapacity, inContiguous ? inCapacity : 1 ));
 }
 

+#ifndef __LP64__

 /*
  * initWithBytes:
  *
 /*
  * initWithBytes:
  *


@@ -206,10 +363,9 @@ bool IOBufferMemoryDescriptor::initWithBytes(const void * inBytes,
                                              IODirection  inDirection,
                                              bool         inContiguous)
 {
                                              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 false;
 
     // start out with no data


@@ -220,6 +376,7 @@ bool IOBufferMemoryDescriptor::initWithBytes(const void * inBytes,
 
     return true;
 }
 
     return true;
 }

+#endif /* !__LP64__ */

 
 /*
  * withBytes:
 
 /*
  * withBytes:


@@ -235,9 +392,25 @@ IOBufferMemoryDescriptor::withBytes(const void * inBytes,
 {
     IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
 
 {
     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;
 }
     }
     return me;
 }


@@ -249,29 +422,52 @@ IOBufferMemoryDescriptor::withBytes(const void * inBytes,
  */
 void IOBufferMemoryDescriptor::free()
 {
  */
 void IOBufferMemoryDescriptor::free()
 {

-    IOOptionBits options   = _options;
-    vm_size_t    size     = _capacity;
-    void *       buffer           = _buffer;
-    vm_offset_t  alignment = _alignment;
-
-    if (_physAddrs)
-        IODelete(_physAddrs, IOPhysicalAddress, _physSegCount);
+    // 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       = 0;
+    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();
+    }

 
     /* super::free may unwire - deallocate buffer afterwards */
     super::free();
 
 
     /* super::free may unwire - deallocate buffer afterwards */
     super::free();
 

-    if (buffer) {
-        if (options & kIOMemoryPageable)
-            IOFreePageable(buffer, size);
-        else {
-            if (options & kIOMemoryPhysicallyContiguous)
-                IOFreeContiguous(buffer, size);
-            else if (alignment > 1)
-                IOFreeAligned(buffer, size);
-            else
-                IOFree(buffer, size);
+    if (options & kIOMemoryPageable)
+    {
+#if IOALLOCDEBUG
+       debug_iomallocpageable_size -= round_page(size);
+#endif
+    }
+    else if (buffer)
+    {
+        if (internalFlags & kInternalFlagPhysical)
+        {
+            if (kInternalFlagPageSized & internalFlags)
+                size = round_page(size);
+            IOKernelFreePhysical((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);

 }
 
 /*
 }
 
 /*


@@ -299,7 +495,7 @@ void IOBufferMemoryDescriptor::setLength(vm_size_t length)
     assert(length <= _capacity);
 
     _length = length;
     assert(length <= _capacity);
 
     _length = length;

-    _singleRange.v.length = length;
+    _ranges.v64->length = length;

 }
 
 /*
 }
 
 /*


@@ -311,7 +507,10 @@ void IOBufferMemoryDescriptor::setLength(vm_size_t length)
  */
 void IOBufferMemoryDescriptor::setDirection(IODirection direction)
 {
  */
 void IOBufferMemoryDescriptor::setDirection(IODirection direction)
 {

-    _direction = direction;
+    _flags = (_flags & ~kIOMemoryDirectionMask) | direction;
+#ifndef __LP64__
+    _direction = (IODirection) (_flags & kIOMemoryDirectionMask);
+#endif /* !__LP64__ */

 }
 
 /*
 }
 
 /*


@@ -324,13 +523,20 @@ 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);
+    vm_size_t   actualBytesToCopy = min(withLength, _capacity - _length);
+    IOByteCount offset;

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

-    bcopy(/* from */ bytes, (void *)(_singleRange.v.address + _length),
-          actualBytesToCopy);
+
+    offset = _length;

     _length += actualBytesToCopy;
     _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;
 }
 
     return true;
 }


@@ -342,9 +548,13 @@ IOBufferMemoryDescriptor::appendBytes(const void * bytes, vm_size_t withLength)
  */
 void * IOBufferMemoryDescriptor::getBytesNoCopy()
 {
  */
 void * IOBufferMemoryDescriptor::getBytesNoCopy()
 {

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

 }
 
 }
 

+

 /*
  * getBytesNoCopy:
  *
 /*
  * getBytesNoCopy:
  *


@@ -353,62 +563,37 @@ 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)
 {

-    if (start < _length && (start + withLength) <= _length)
-        return (void *)(_singleRange.v.address + start);
+    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;
 }
 
     return 0;
 }
 

-/*
- * getPhysicalSegment:
- *
- * Get the physical address of the buffer, relative to the current position.
- * If the current position is at the end of the buffer, a zero is returned.
- */
-IOPhysicalAddress
-IOBufferMemoryDescriptor::getPhysicalSegment(IOByteCount offset,
-                                       IOByteCount * lengthOfSegment)
+#ifndef __LP64__
+void * IOBufferMemoryDescriptor::getVirtualSegment(IOByteCount offset,
+                                                       IOByteCount * lengthOfSegment)

 {
 {

-    IOPhysicalAddress physAddr;
-
-    if( offset != _position)
-       setPosition( offset );
-
-    assert(_position <= _length);
-
-    /* Fail gracefully if the position is at (or past) the end-of-buffer. */
-    if (_position >= _length) {
-        *lengthOfSegment = 0;
-        return 0;
-    }
-
-    if (_options & kIOMemoryPageable) {
-        physAddr = super::getPhysicalSegment(offset, lengthOfSegment);
-
-    } else {
-        /* Compute the largest contiguous physical length possible. */
-        vm_address_t actualPos  = _singleRange.v.address + _position;
-        vm_address_t actualPage = trunc_page(actualPos);
-        unsigned     physInd    = atop(actualPage-trunc_page(_singleRange.v.address));
+    void * bytes = getBytesNoCopy(offset, 0);

     
     

-        vm_size_t physicalLength = actualPage + page_size - actualPos;
-        for (unsigned index = physInd + 1; index < _physSegCount &&
-            _physAddrs[index] == _physAddrs[index-1] + page_size; index++) {
-            physicalLength += page_size;
-        }
-    
-        /* Clip contiguous physical length at the end-of-buffer. */
-        if (physicalLength > _length - _position)
-            physicalLength = _length - _position;
-    
-        *lengthOfSegment = physicalLength;
-        physAddr = _physAddrs[physInd] + (actualPos - actualPage);
-    }
+    if (bytes && lengthOfSegment)
+       *lengthOfSegment = _length - offset;

 
 

-    return physAddr;
+    return bytes;

 }
 }

+#endif /* !__LP64__ */

 
 

+#ifdef __LP64__

 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 0);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 1);
 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);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 2);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 3);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 4);