*
* @APPLE_LICENSE_HEADER_START@
*
- * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved.
+ * 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. 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
+ * This 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, 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 OR NON-INFRINGEMENT. Please see the
+ * License for the specific language governing rights and limitations
+ * under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
enum {
kIOMemoryPhysicallyContiguous = 0x00000010,
kIOMemoryPageable = 0x00000020,
+ kIOMemoryPurgeable = 0x00000040,
kIOMemorySharingTypeMask = 0x000f0000,
kIOMemoryUnshared = 0x00000000,
- kIOMemoryKernelUserShared = 0x00010000,
+ kIOMemoryKernelUserShared = 0x00010000
};
#define _IOBUFFERMEMORYDESCRIPTOR_INTASKWITHOPTIONS_ 1
+/*!
+ @class IOBufferMemoryDescriptor
+ @abstract Provides a simple memory descriptor that allocates its own buffer memory.
+*/
class IOBufferMemoryDescriptor : public IOGeneralMemoryDescriptor
{
vm_offset_t alignment = 1);
/*! @function inTaskWithOptions
- @abstract Create a memory buffer with memory descriptor for that buffer. Added in Mac OS X 10.2.
- @discussion This method allocates a memory buffer with a given size and alignment in the task's address space specified, and returns a memory descriptor instance representing the memory. It is recommended memory allocated for I/O or sharing via mapping be created via IOBufferMemoryDescriptor. Options passed with the request specify the kind of memory to be allocated - pageablity and sharing are specified with option bits. This function may block and so should not be called from interrupt level or while a simple lock is held.
+ @abstract Creates a memory buffer with memory descriptor for that buffer.
+ @discussion Added in Mac OS X 10.2, this method allocates a memory buffer with a given size and alignment in the task's address space specified, and returns a memory descriptor instance representing the memory. It is recommended that memory allocated for I/O or sharing via mapping be created via IOBufferMemoryDescriptor. Options passed with the request specify the kind of memory to be allocated - pageablity and sharing are specified with option bits. This function may block and so should not be called from interrupt level or while a simple lock is held.
@param inTask The task the buffer will be allocated in.
- @param options Options for the allocation:
- kIOMemoryPhysicallyContiguous - pass to request memory be physically contiguous. This option is heavily discouraged. The request may fail if memory is fragmented, may cause large amounts of paging activity, and may take a very long time to execute.
- kIOMemoryPageable - pass to request memory be non-wired - the default for kernel allocated memory is wired.
+ @param options Options for the allocation:<br>
+ kIOMemoryPhysicallyContiguous - pass to request memory be physically contiguous. This option is heavily discouraged. The request may fail if memory is fragmented, may cause large amounts of paging activity, and may take a very long time to execute.<br>
+ kIOMemoryPageable - pass to request memory be non-wired - the default for kernel allocated memory is wired.<br>
+ kIOMemoryPurgeable - pass to request memory that may later have its purgeable state set with IOMemoryDescriptor::setPurgeable. Only supported for kIOMemoryPageable allocations.<br>
kIOMemoryKernelUserShared - pass to request memory that will be mapped into both the kernel and client applications.
@param capacity The number of bytes to allocate.
@param alignment The minimum required alignment of the buffer in bytes - 1 is the default for no required alignment. For example, pass 256 to get memory allocated at an address with bits 0-7 zero.
- @result An instance of class IOBufferMemoryDescriptor. To be released by the caller, which will free the memory desriptor and associated buffer. */
+ @result Returns an instance of class IOBufferMemoryDescriptor to be released by the caller, which will free the memory desriptor and associated buffer. */
static IOBufferMemoryDescriptor * inTaskWithOptions(
task_t inTask,
projects / apple / xnu.git / blobdiff