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 d09defb1e1f5dc1f68b652541d2e2dcdc77a75db..8de94f0294a533477f4262e29f2404d7e3ab9217 100644 (file)
--- a/iokit/Kernel/IOBufferMemoryDescriptor.cpp
+++ b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
@@ -28,9 +28,9 @@
 __BEGIN_DECLS
 void ipc_port_release_send(ipc_port_t port);
 #include <vm/pmap.h>
 __BEGIN_DECLS
 void ipc_port_release_send(ipc_port_t port);
 #include <vm/pmap.h>

-__END_DECLS

 
 

-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,


@@ -87,6 +87,7 @@ bool IOBufferMemoryDescriptor::initWithOptions(
                               task_t       inTask)
 {
     vm_map_t map = 0;
                               task_t       inTask)
 {
     vm_map_t map = 0;

+    IOOptionBits iomdOptions = kIOMemoryAsReference | kIOMemoryTypeVirtual;

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


@@ -97,6 +98,9 @@ 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;
 


@@ -106,6 +110,7 @@ bool IOBufferMemoryDescriptor::initWithOptions(
     _alignment = alignment;
     if (options & kIOMemoryPageable)
     {
     _alignment = alignment;
     if (options & kIOMemoryPageable)
     {

+        iomdOptions |= kIOMemoryBufferPageable;

        if (inTask == kernel_task)
        {
            /* Allocate some kernel address space. */
        if (inTask == kernel_task)
        {
            /* Allocate some kernel address space. */


@@ -125,19 +130,24 @@ bool IOBufferMemoryDescriptor::initWithOptions(
            map = get_task_map(inTask);
            vm_map_reference(map);
            reserved->map = map;
            map = get_task_map(inTask);
            vm_map_reference(map);
            reserved->map = map;

-           kr = vm_allocate( map, (vm_address_t *) &_buffer, round_page(capacity),
+           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.
                                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);
+           kr = vm_inherit( map, (vm_address_t) _buffer, round_page_32(capacity), VM_INHERIT_NONE);

            if( KERN_SUCCESS != kr)
                return( false );
        }
     }
     else 
     {
            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);
        /* Allocate a wired-down buffer inside kernel space. */
        if (options & kIOMemoryPhysicallyContiguous)
            _buffer = IOMallocContiguous(capacity, alignment, 0);


@@ -153,26 +163,50 @@ bool IOBufferMemoryDescriptor::initWithOptions(
     _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),
-                                inTask, true))
+    if (!super::initWithOptions(&_singleRange.v, 1, 0,
+                               inTask, iomdOptions, /* System mapper */ 0))

        return false;
 
        return false;
 

-    if (options & kIOMemoryPageable)
-    {
-        _flags |= kIOMemoryRequiresWire;
-
+    if (options & kIOMemoryPageable) {

         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) {

+
+            // 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,
             kr = mach_make_memory_entry( map,
                         &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;
             }


@@ -181,23 +215,6 @@ bool IOBufferMemoryDescriptor::initWithOptions(
             _memEntry = (void *) sharedMem;
         }
     }
             _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);
     


@@ -208,7 +225,7 @@ IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::inTaskWithOptions(
                                            task_t       inTask,
                                             IOOptionBits options,
                                             vm_size_t    capacity,
                                            task_t       inTask,
                                             IOOptionBits options,
                                             vm_size_t    capacity,

-                                            vm_offset_t  alignment = 1)
+                                            vm_offset_t  alignment)

 {
     IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
     
 {
     IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
     


@@ -230,7 +247,7 @@ bool IOBufferMemoryDescriptor::initWithOptions(
 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;
     


@@ -313,15 +330,14 @@ 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;
     vm_map_t    map       = 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)
     {
        map = reserved->map;
     if (reserved)
     {
        map = reserved->map;


@@ -336,7 +352,7 @@ void IOBufferMemoryDescriptor::free()
         if (options & kIOMemoryPageable)
        {
            if (map)
         if (options & kIOMemoryPageable)
        {
            if (map)

-               vm_deallocate(map, (vm_address_t) buffer, round_page(size));
+               vm_deallocate(map, (vm_address_t) buffer, round_page_32(size));

            else
               IOFreePageable(buffer, size);
        }
            else
               IOFreePageable(buffer, size);
        }


@@ -438,55 +454,6 @@ 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;
-}
-

 OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 0);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 1);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 2);
 OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 0);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 1);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 2);