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--- xnu/xnu-201/iokit/Kernel/IOBufferMemoryDescriptor.cpp
+++ xnu/xnu-792.18.15/iokit/Kernel/IOBufferMemoryDescriptor.cpp
@@ -1,35 +1,52 @@
/*
* 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@
*/
#include <IOKit/assert.h>
#include <IOKit/system.h>
#include <IOKit/IOLib.h>
+#include <IOKit/IOMapper.h>
#include <IOKit/IOBufferMemoryDescriptor.h>
+
+#include "IOKitKernelInternal.h"
+#include "IOCopyMapper.h"
__BEGIN_DECLS
void ipc_port_release_send(ipc_port_t port);
+#include <vm/pmap.h>
+
+vm_map_t IOPageableMapForAddress( vm_address_t address );
__END_DECLS
-extern "C" vm_map_t IOPageableMapForAddress( vm_address_t address );
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+volatile ppnum_t gIOHighestAllocatedPage;
+
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
#define super IOGeneralMemoryDescriptor
OSDefineMetaClassAndStructors(IOBufferMemoryDescriptor,
@@ -82,8 +99,25 @@
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));
+}
+
+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;
+ addr64_t lastIOAddr;
+ vm_map_t vmmap = 0;
+ IOOptionBits iomdOptions = kIOMemoryAsReference | kIOMemoryTypeVirtual;
+
if (!capacity)
return false;
@@ -93,69 +127,205 @@
_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;
+
+ if (physicalMask && (alignment <= 1))
+ alignment = ((physicalMask ^ PAGE_MASK) & PAGE_MASK) + 1;
+
+ if ((options & kIOMemoryPhysicallyContiguous) && !physicalMask)
+ physicalMask = 0xFFFFFFFF;
+
_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);
+ {
+ iomdOptions |= kIOMemoryBufferPageable;
+
+ ipc_port_t sharedMem;
+ vm_size_t size = round_page_32(capacity);
+
+ // must create the entry before any pages are allocated
+
+ // set flags for entry + object create
+ vm_prot_t memEntryCacheMode = VM_PROT_READ | VM_PROT_WRITE
+ | MAP_MEM_NAMED_CREATE;
+
+ if (options & kIOMemoryPurgeable)
+ memEntryCacheMode |= MAP_MEM_PURGABLE;
+
+ // 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;
+ }
+
+ 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( KERN_SUCCESS != kr)
+ return( false );
+
+ _memEntry = (void *) sharedMem;
+#if IOALLOCDEBUG
+ debug_iomallocpageable_size += size;
+#endif
+ if (NULL == inTask)
+ inTask = kernel_task;
+ else if (inTask == kernel_task)
+ {
+ vmmap = kernel_map;
+ }
+ else
+ {
+ if( !reserved) {
+ reserved = IONew( ExpansionData, 1 );
+ if( !reserved)
+ return( false );
+ }
+ vmmap = get_task_map(inTask);
+ vm_map_reference(vmmap);
+ reserved->map = vmmap;
+ }
+ }
else
- _buffer = IOMalloc(capacity);
-
- if (!_buffer)
- return false;
+ {
+ if (IOMapper::gSystem)
+ // assuming mapped space is 2G
+ lastIOAddr = (1UL << 31) - PAGE_SIZE;
+ else
+ lastIOAddr = ptoa_64(gIOHighestAllocatedPage);
+
+ if (physicalMask && (lastIOAddr != (lastIOAddr & physicalMask)))
+ {
+ mach_vm_address_t address;
+ iomdOptions &= ~kIOMemoryTypeVirtual;
+ iomdOptions |= kIOMemoryTypePhysical;
+
+ address = IOMallocPhysical(capacity, physicalMask);
+ _buffer = (void *) address;
+ if (!_buffer)
+ return false;
+
+ if (inTask == kernel_task)
+ {
+ vmmap = kernel_map;
+ }
+ else if (NULL != inTask)
+ {
+ if( !reserved) {
+ reserved = IONew( ExpansionData, 1 );
+ if( !reserved)
+ return( false );
+ }
+ vmmap = get_task_map(inTask);
+ vm_map_reference(vmmap);
+ reserved->map = vmmap;
+ }
+ inTask = 0;
+ }
+ else
+ {
+ // 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)
+ _buffer = (void *) IOKernelAllocateContiguous(capacity, alignment);
+ else if (alignment > 1)
+ _buffer = IOMallocAligned(capacity, alignment);
+ else
+ _buffer = IOMalloc(capacity);
+ if (!_buffer)
+ 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 = round_page(_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 != round_page(_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;
-
- 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 (physicalMask && !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 & physicalMask))
+ {
+ if (kIOMemoryTypePhysical != (_flags & kIOMemoryTypeMask))
+ {
+ // flag a retry
+ _physSegCount = 1;
+ }
+ return false;
+ }
+ }
+
+ if (vmmap)
+ {
+ kr = doMap(vmmap, (IOVirtualAddress *) &_buffer, kIOMapAnywhere, 0, capacity);
+ if (KERN_SUCCESS != kr)
+ {
+ _buffer = 0;
+ return( false );
+ }
+
+ if (kIOMemoryTypeVirtual & iomdOptions)
+ _singleRange.v.address = (vm_address_t) _buffer;
}
setLength(capacity);
@@ -163,18 +333,71 @@
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)) {
+ bool retry = me->_physSegCount;
+ me->release();
+ me = 0;
+ if (retry)
+ {
+ me = new IOBufferMemoryDescriptor;
+ if (me && !me->initWithOptions(options, capacity, alignment, inTask))
+ {
+ 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))
+ {
+ bool retry = me->_physSegCount;
+ me->release();
+ me = 0;
+ if (retry)
+ {
+ me = new IOBufferMemoryDescriptor;
+ if (me && !me->initWithPhysicalMask(inTask, options, capacity, 1, physicalMask))
+ {
+ 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)
-{
- IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
-
- if (me && !me->initWithOptions(options, capacity, alignment)) {
- me->release();
- me = 0;
- }
- return me;
+ vm_offset_t alignment)
+{
+ return(IOBufferMemoryDescriptor::inTaskWithOptions(kernel_task, options, capacity, alignment));
}
@@ -235,9 +458,21 @@
{
IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
- if (me && !me->initWithBytes(inBytes, inLength, inDirection, inContiguous)){
- me->release();
- me = 0;
+ if (me && !me->initWithBytes(inBytes, inLength, inDirection, inContiguous))
+ {
+ bool retry = me->_physSegCount;
+ me->release();
+ me = 0;
+ if (retry)
+ {
+ me = new IOBufferMemoryDescriptor;
+ if (me && !me->initWithBytes(inBytes, inLength, inDirection, inContiguous))
+ {
+ me->release();
+ me = 0;
+ }
+ }
+
}
return me;
}
@@ -249,29 +484,56 @@
*/
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 options = _options;
+ vm_size_t size = _capacity;
+ void * buffer = _buffer;
+ IOVirtualAddress source = _singleRange.v.address;
+ vm_map_t vmmap = 0;
+ vm_offset_t alignment = _alignment;
+
+ if (reserved)
+ {
+ vmmap = reserved->map;
+ IODelete( reserved, ExpansionData, 1 );
+ }
/* 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);
+ if (options & kIOMemoryPageable)
+ {
+#if IOALLOCDEBUG
+ if (!buffer || vmmap)
+ debug_iomallocpageable_size -= round_page_32(size);
+#endif
+ if (buffer)
+ {
+ if (vmmap)
+ vm_deallocate(vmmap, (vm_address_t) buffer, round_page_32(size));
else
- IOFree(buffer, size);
+ IOFreePageable(buffer, size);
}
}
+ else if (buffer)
+ {
+ if (kIOMemoryTypePhysical == (flags & kIOMemoryTypeMask))
+ {
+ if (vmmap)
+ vm_deallocate(vmmap, (vm_address_t) buffer, round_page_32(size));
+ IOFreePhysical((mach_vm_address_t) 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 (vmmap)
+ vm_map_deallocate(vmmap);
}
/*
@@ -324,14 +586,21 @@
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;
+ if (_task == kernel_task)
+ bcopy(/* from */ bytes, (void *)(_singleRange.v.address + offset),
+ actualBytesToCopy);
+ else
+ writeBytes(offset, bytes, actualBytesToCopy);
+
return true;
}
@@ -342,8 +611,12 @@
*/
void * IOBufferMemoryDescriptor::getBytesNoCopy()
{
- return (void *)_singleRange.v.address;
-}
+ if (kIOMemoryTypePhysical == (_flags & kIOMemoryTypeMask))
+ return _buffer;
+ else
+ return (void *)_singleRange.v.address;
+}
+
/*
* getBytesNoCopy:
@@ -353,62 +626,30 @@
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 (kIOMemoryTypePhysical == (_flags & kIOMemoryTypeMask))
+ address = (IOVirtualAddress) _buffer;
+ else
+ address = _singleRange.v.address;
+
+ if (start < _length && (start + withLength) <= _length)
+ return (void *)(address + start);
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));
+/* DEPRECATED */ void * IOBufferMemoryDescriptor::getVirtualSegment(IOByteCount offset,
+/* DEPRECATED */ IOByteCount * lengthOfSegment)
+{
+ 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);
- }
-
- return physAddr;
-}
-
-OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 0);
-OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 1);
+ if (bytes && lengthOfSegment)
+ *lengthOfSegment = _length - offset;
+
+ return bytes;
+}
+
+OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 0);
+OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 1);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 2);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 3);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 4);