xnu-344.26.tar.gz

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

diff --git a/iokit/Kernel/IOBufferMemoryDescriptor.cpp b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
index c209c70356e04857368c3817a64031f09905df37..d09defb1e1f5dc1f68b652541d2e2dcdc77a75db 100644 (file)
--- a/iokit/Kernel/IOBufferMemoryDescriptor.cpp
+++ b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
@@ -27,6 +27,7 @@
 
 __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 );
@@ -82,8 +83,11 @@ bool IOBufferMemoryDescriptor::initWithRanges(
 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;
+
     if (!capacity)
         return false;
 
@@ -96,43 +100,79 @@ bool IOBufferMemoryDescriptor::initWithOptions(
     if ((options & kIOMemorySharingTypeMask) && (alignment < page_size))
         alignment = page_size;
 
+    if ((inTask != kernel_task) && !(options & kIOMemoryPageable))
+        return false;
+
     _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);
+    {
+       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(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;
+       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))
+                                inTask, true))
        return false;
 
-    if (options & kIOMemoryPageable) {
+    if (options & kIOMemoryPageable)
+    {
         _flags |= kIOMemoryRequiresWire;
 
         kern_return_t kr;
         ipc_port_t sharedMem = (ipc_port_t) _memEntry;
-        vm_size_t size = _ranges.v[0].length;
+        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 ),
+            kr = mach_make_memory_entry( map,
                         &size, _ranges.v[0].address,
                         VM_PROT_READ | VM_PROT_WRITE, &sharedMem,
                         NULL );
-            if( (KERN_SUCCESS == kr) && (size != _ranges.v[0].length)) {
+            if( (KERN_SUCCESS == kr) && (size != round_page(_ranges.v[0].length))) {
                 ipc_port_release_send( sharedMem );
                 kr = kIOReturnVMError;
             }
@@ -140,8 +180,9 @@ bool IOBufferMemoryDescriptor::initWithOptions(
                 sharedMem = 0;
             _memEntry = (void *) sharedMem;
         }
-        
-    } else {
+    }
+    else
+    {
         /* Precompute virtual-to-physical page mappings. */
         vm_address_t inBuffer = (vm_address_t) _buffer;
         _physSegCount = atop(trunc_page(inBuffer + capacity - 1) -
@@ -163,6 +204,29 @@ bool IOBufferMemoryDescriptor::initWithOptions(
     return true;
 }
 
+IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::inTaskWithOptions(
+                                           task_t       inTask,
+                                            IOOptionBits options,
+                                            vm_size_t    capacity,
+                                            vm_offset_t  alignment = 1)
+{
+    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,
@@ -170,7 +234,7 @@ IOBufferMemoryDescriptor * IOBufferMemoryDescriptor::withOptions(
 {
     IOBufferMemoryDescriptor *me = new IOBufferMemoryDescriptor;
     
-    if (me && !me->initWithOptions(options, capacity, alignment)) {
+    if (me && !me->initWithOptions(options, capacity, alignment, kernel_task)) {
        me->release();
        me = 0;
     }
@@ -252,18 +316,32 @@ void IOBufferMemoryDescriptor::free()
     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;
+        IODelete( reserved, ExpansionData, 1 );
+    }
+
     /* super::free may unwire - deallocate buffer afterwards */
     super::free();
 
-    if (buffer) {
+    if (buffer)
+    {
         if (options & kIOMemoryPageable)
-            IOFreePageable(buffer, size);
-        else {
+       {
+           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)
@@ -272,6 +350,8 @@ void IOBufferMemoryDescriptor::free()
                 IOFree(buffer, size);
         }
     }
+    if (map)
+       vm_map_deallocate(map);
 }
 
 /*
@@ -407,7 +487,7 @@ IOBufferMemoryDescriptor::getPhysicalSegment(IOByteCount offset,
     return physAddr;
 }
 
-OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 0);
+OSMetaClassDefineReservedUsed(IOBufferMemoryDescriptor, 0);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 1);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 2);
 OSMetaClassDefineReservedUnused(IOBufferMemoryDescriptor, 3);