*
* @APPLE_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.
+ * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
*
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * 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@
*/
__BEGIN_DECLS
void ipc_port_release_send(ipc_port_t port);
-__END_DECLS
+#include <vm/pmap.h>
-extern "C" vm_map_t IOPageableMapForAddress( vm_address_t address );
+vm_map_t IOPageableMapForAddress( vm_address_t address );
+__END_DECLS
#define super IOGeneralMemoryDescriptor
OSDefineMetaClassAndStructors(IOBufferMemoryDescriptor,
bool IOBufferMemoryDescriptor::initWithOptions(
IOOptionBits options,
vm_size_t capacity,
- vm_offset_t alignment)
+ vm_offset_t alignment,
+ task_t inTask)
{
+ vm_map_t map = 0;
+ IOOptionBits iomdOptions = kIOMemoryAsReference | kIOMemoryTypeVirtual;
+
if (!capacity)
return false;
_physSegCount = 0;
_buffer = 0;
+ // Grab the direction and the Auto Prepare bits from the Buffer MD options
+ iomdOptions |= options & (kIOMemoryDirectionMask | kIOMemoryAutoPrepare);
+
if ((options & kIOMemorySharingTypeMask) && (alignment < page_size))
alignment = page_size;
+ if ((inTask != kernel_task) && !(options & kIOMemoryPageable))
+ return false;
+
_alignment = alignment;
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);
- else
- _buffer = IOMalloc(capacity);
+ {
+ iomdOptions |= kIOMemoryBufferPageable;
+ if (inTask == kernel_task)
+ {
+ /* Allocate some kernel address space. */
+ _buffer = IOMallocPageable(capacity, alignment);
+ if (_buffer)
+ map = IOPageableMapForAddress((vm_address_t) _buffer);
+ }
+ else
+ {
+ kern_return_t kr;
+
+ if( !reserved) {
+ reserved = IONew( ExpansionData, 1 );
+ if( !reserved)
+ return( false );
+ }
+ map = get_task_map(inTask);
+ vm_map_reference(map);
+ reserved->map = map;
+ kr = vm_allocate( map, (vm_address_t *) &_buffer, round_page_32(capacity),
+ VM_FLAGS_ANYWHERE | VM_MAKE_TAG(VM_MEMORY_IOKIT) );
+ if( KERN_SUCCESS != kr)
+ return( false );
+
+ // we have to make sure that these pages don't get copied on fork.
+ kr = vm_inherit( map, (vm_address_t) _buffer, round_page_32(capacity), VM_INHERIT_NONE);
+ if( KERN_SUCCESS != kr)
+ return( false );
+ }
+ }
+ 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 (!_buffer)
- return false;
+ return false;
_singleRange.v.address = (vm_address_t) _buffer;
_singleRange.v.length = capacity;
- if (!super::initWithRanges(&_singleRange.v, 1,
- (IODirection) (options & kIOMemoryDirectionMask),
- kernel_task, true))
+ if (!super::initWithOptions(&_singleRange.v, 1, 0,
+ inTask, iomdOptions, /* System mapper */ 0))
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;
+ vm_size_t size = round_page_32(_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 ),
+
+ // set memory entry cache
+ vm_prot_t memEntryCacheMode = VM_PROT_READ | VM_PROT_WRITE;
+ 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;
+ }
+
+ kr = mach_make_memory_entry( map,
&size, _ranges.v[0].address,
- VM_PROT_READ | VM_PROT_WRITE, &sharedMem,
+ memEntryCacheMode, &sharedMem,
NULL );
- if( (KERN_SUCCESS == kr) && (size != _ranges.v[0].length)) {
+
+ if( (KERN_SUCCESS == kr) && (size != round_page_32(_ranges.v[0].length))) {
ipc_port_release_send( sharedMem );
kr = kIOReturnVMError;
}
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;
-
- 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;
- }
}
setLength(capacity);
return true;
}
+IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::inTaskWithOptions(
+ task_t inTask,
+ IOOptionBits options,
+ vm_size_t capacity,
+ vm_offset_t alignment)
+{
+ IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
+
+ if (me && !me->initWithOptions(options, capacity, alignment, inTask)) {
+ me->release();
+ me = 0;
+ }
+ return me;
+}
+
+bool IOBufferMemoryDescriptor::initWithOptions(
+ IOOptionBits options,
+ vm_size_t capacity,
+ vm_offset_t alignment)
+{
+ return( initWithOptions(options, capacity, alignment, kernel_task) );
+}
+
IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::withOptions(
IOOptionBits options,
vm_size_t capacity,
- vm_offset_t alignment = 1)
+ vm_offset_t alignment)
{
IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
- if (me && !me->initWithOptions(options, capacity, alignment)) {
+ if (me && !me->initWithOptions(options, capacity, alignment, kernel_task)) {
me->release();
me = 0;
}
*/
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 map = 0;
vm_offset_t alignment = _alignment;
- if (_physAddrs)
- IODelete(_physAddrs, IOPhysicalAddress, _physSegCount);
+ if (reserved)
+ {
+ map = reserved->map;
+ IODelete( reserved, ExpansionData, 1 );
+ }
/* super::free may unwire - deallocate buffer afterwards */
super::free();
- if (buffer) {
+ if (buffer)
+ {
if (options & kIOMemoryPageable)
- IOFreePageable(buffer, size);
- else {
+ {
+ if (map)
+ vm_deallocate(map, (vm_address_t) buffer, round_page_32(size));
+ else
+ IOFreePageable(buffer, size);
+ }
+ else
+ {
if (options & kIOMemoryPhysicallyContiguous)
IOFreeContiguous(buffer, size);
else if (alignment > 1)
IOFree(buffer, size);
}
}
+ if (map)
+ vm_map_deallocate(map);
}
/*
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)
-{
- 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));
-
- 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);
- }
-
- return physAddr;
-}
-
-OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 0);
+OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 0);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 1);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 2);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 3);
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