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--- xnu/xnu-792.13.8/iokit/Kernel/IOBufferMemoryDescriptor.cpp
+++ xnu/xnu-344/iokit/Kernel/IOBufferMemoryDescriptor.cpp
@@ -1,54 +1,36 @@
/*
* Copyright (c) 1998-2000 Apple Computer, Inc. All rights reserved.
*
- * @APPLE_LICENSE_OSREFERENCE_HEADER_START@
+ * @APPLE_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
- * 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.
- *
- * 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, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
+ * 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 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.
+ *
+ * @APPLE_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
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
-
-volatile ppnum_t gIOHighestAllocatedPage;
-
-/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+extern "C" vm_map_t IOPageableMapForAddress( vm_address_t address );
#define super IOGeneralMemoryDescriptor
OSDefineMetaClassAndStructors(IOBufferMemoryDescriptor,
@@ -104,21 +86,7 @@
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;
+ vm_map_t map = 0;
if (!capacity)
return false;
@@ -129,205 +97,106 @@
_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)
{
- 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)
+ if (inTask == kernel_task)
{
- 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;
+ /* 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 );
}
- vmmap = get_task_map(inTask);
- vm_map_reference(vmmap);
- reserved->map = vmmap;
+ map = get_task_map(inTask);
+ vm_map_reference(map);
+ reserved->map = map;
+ kr = vm_allocate( map, (vm_address_t *) &_buffer, round_page(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(capacity), VM_INHERIT_NONE);
+ if( KERN_SUCCESS != kr)
+ return( false );
}
+ }
+ else
+ {
+ /* 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;
+
+ _singleRange.v.address = (vm_address_t) _buffer;
+ _singleRange.v.length = capacity;
+
+ if (!super::initWithRanges(&_singleRange.v, 1,
+ (IODirection) (options & kIOMemoryDirectionMask),
+ inTask, true))
+ 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( map,
+ &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
{
- 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::initWithOptions(&_singleRange.v, 1, 0,
- inTask, iomdOptions, /* System mapper */ 0))
- return false;
-
- 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;
+ /* 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);
@@ -339,49 +208,13 @@
task_t inTask,
IOOptionBits options,
vm_size_t capacity,
- vm_offset_t alignment)
+ vm_offset_t alignment = 1)
{
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;
}
@@ -397,9 +230,15 @@
IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::withOptions(
IOOptionBits options,
vm_size_t capacity,
- vm_offset_t alignment)
-{
- return(IOBufferMemoryDescriptor::inTaskWithOptions(kernel_task, options, capacity, alignment));
+ vm_offset_t alignment = 1)
+{
+ IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
+
+ if (me && !me->initWithOptions(options, capacity, alignment, kernel_task)) {
+ me->release();
+ me = 0;
+ }
+ return me;
}
@@ -460,21 +299,9 @@
{
IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
- 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;
- }
- }
-
+ if (me && !me->initWithBytes(inBytes, inLength, inDirection, inContiguous)){
+ me->release();
+ me = 0;
}
return me;
}
@@ -486,56 +313,45 @@
*/
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;
- IOVirtualAddress source = _singleRange.v.address;
- vm_map_t vmmap = 0;
- vm_offset_t alignment = _alignment;
+ 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)
{
- vmmap = reserved->map;
+ map = reserved->map;
IODelete( reserved, ExpansionData, 1 );
}
/* super::free may unwire - deallocate buffer afterwards */
super::free();
- if (options & kIOMemoryPageable)
+ if (buffer)
{
-#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));
+ if (options & kIOMemoryPageable)
+ {
+ if (map)
+ vm_deallocate(map, (vm_address_t) buffer, round_page(size));
+ else
+ IOFreePageable(buffer, size);
+ }
+ else
+ {
+ if (options & kIOMemoryPhysicallyContiguous)
+ IOFreeContiguous(buffer, size);
+ else if (alignment > 1)
+ IOFreeAligned(buffer, size);
else
- IOFreePageable(buffer, size);
+ IOFree(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);
+ if (map)
+ vm_map_deallocate(map);
}
/*
@@ -588,21 +404,14 @@
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);
assert(_length <= _capacity);
-
- offset = _length;
+ bcopy(/* from */ bytes, (void *)(_singleRange.v.address + _length),
+ actualBytesToCopy);
_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;
}
@@ -613,12 +422,8 @@
*/
void * IOBufferMemoryDescriptor::getBytesNoCopy()
{
- if (kIOMemoryTypePhysical == (_flags & kIOMemoryTypeMask))
- return _buffer;
- else
- return (void *)_singleRange.v.address;
-}
-
+ return (void *)_singleRange.v.address;
+}
/*
* getBytesNoCopy:
@@ -628,30 +433,62 @@
void *
IOBufferMemoryDescriptor::getBytesNoCopy(vm_size_t start, vm_size_t withLength)
{
- IOVirtualAddress address;
- if (kIOMemoryTypePhysical == (_flags & kIOMemoryTypeMask))
- address = (IOVirtualAddress) _buffer;
- else
- address = _singleRange.v.address;
-
- if (start < _length && (start + withLength) <= _length)
- return (void *)(address + start);
+ if (start < _length && (start + withLength) <= _length)
+ return (void *)(_singleRange.v.address + start);
return 0;
}
-/* DEPRECATED */ void * IOBufferMemoryDescriptor::getVirtualSegment(IOByteCount offset,
-/* DEPRECATED */ IOByteCount * lengthOfSegment)
-{
- void * bytes = getBytesNoCopy(offset, 0);
-
- if (bytes && lengthOfSegment)
- *lengthOfSegment = _length - offset;
-
- return bytes;
+/*
+ * 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;
}
OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 0);
-OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 1);
+OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 1);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 2);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 3);
OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 4);