xnu-517.9.5.tar.gz

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

diff --git a/iokit/Kernel/IOBufferMemoryDescriptor.cpp b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
index 2bf4b50e8f1fd18ff84d0aa6ab3b0c783f28d66e..8de94f0294a533477f4262e29f2404d7e3ab9217 100644 (file)
--- a/iokit/Kernel/IOBufferMemoryDescriptor.cpp
+++ b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
@@ -27,9 +27,10 @@
 
 __BEGIN_DECLS
 void ipc_port_release_send(ipc_port_t port);
 
 __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,
 
 #define super IOGeneralMemoryDescriptor
 OSDefineMetaClassAndStructors(IOBufferMemoryDescriptor,


@@ -82,8 +83,12 @@ bool IOBufferMemoryDescriptor::initWithRanges(
 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)

 {
 {

+    vm_map_t map = 0;
+    IOOptionBits iomdOptions = kIOMemoryAsReference | kIOMemoryTypeVirtual;
+

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


@@ -93,46 +98,115 @@ bool IOBufferMemoryDescriptor::initWithOptions(
     _physSegCount = 0;
     _buffer      = 0;
 
     _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 ((options & kIOMemorySharingTypeMask) && (alignment < page_size))
         alignment = page_size;
 

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

     _alignment = alignment;
     if (options & kIOMemoryPageable)
     _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)
 
     if (!_buffer)

-        return false;
+       return false;

 
     _singleRange.v.address = (vm_address_t) _buffer;
     _singleRange.v.length  = capacity;
 
 
     _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) {
        return false;
 
     if (options & kIOMemoryPageable) {

-        _flags |= kIOMemoryRequiresWire;
-

         kern_return_t kr;
         ipc_port_t sharedMem = (ipc_port_t) _memEntry;
         kern_return_t kr;
         ipc_port_t sharedMem = (ipc_port_t) _memEntry;

-        vm_size_t size = round_page(_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) {
 
         // 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,
                         &size, _ranges.v[0].address,

-                        VM_PROT_READ | VM_PROT_WRITE, &sharedMem,
+                        memEntryCacheMode, &sharedMem,

                         NULL );
                         NULL );

-            if( (KERN_SUCCESS == kr) && (size != round_page(_ranges.v[0].length))) {
+
+            if( (KERN_SUCCESS == kr) && (size != round_page_32(_ranges.v[0].length))) {

                 ipc_port_release_send( sharedMem );
                 kr = kIOReturnVMError;
             }
                 ipc_port_release_send( sharedMem );
                 kr = kIOReturnVMError;
             }


@@ -140,22 +214,6 @@ bool IOBufferMemoryDescriptor::initWithOptions(
                 sharedMem = 0;
             _memEntry = (void *) sharedMem;
         }
                 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);
     }
 
     setLength(capacity);


@@ -163,14 +221,37 @@ bool IOBufferMemoryDescriptor::initWithOptions(
     return true;
 }
 
     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,
 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->initWithOptions(options, capacity, alignment, kernel_task)) {

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


@@ -249,21 +330,34 @@ IOBufferMemoryDescriptor::withBytes(const void * inBytes,
  */
 void IOBufferMemoryDescriptor::free()
 {
  */
 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;
     IOOptionBits options   = _options;
     vm_size_t    size     = _capacity;
     void *       buffer           = _buffer;

+    vm_map_t    map       = 0;

     vm_offset_t  alignment = _alignment;
 
     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();
 
 
     /* super::free may unwire - deallocate buffer afterwards */
     super::free();
 

-    if (buffer) {
+    if (buffer)
+    {

         if (options & kIOMemoryPageable)
         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)
             if (options & kIOMemoryPhysicallyContiguous)
                 IOFreeContiguous(buffer, size);
             else if (alignment > 1)


@@ -272,6 +366,8 @@ void IOBufferMemoryDescriptor::free()
                 IOFree(buffer, size);
         }
     }
                 IOFree(buffer, size);
         }
     }

+    if (map)
+       vm_map_deallocate(map);

 }
 
 /*
 }
 
 /*


@@ -358,56 +454,7 @@ IOBufferMemoryDescriptor::getBytesNoCopy(vm_size_t start, vm_size_t withLength)
     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)
-{
-    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);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 1);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 2);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 3);