xnu-792.6.76.tar.gz

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

diff --git a/iokit/Kernel/IOBufferMemoryDescriptor.cpp b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
index d09defb1e1f5dc1f68b652541d2e2dcdc77a75db..337c16895920033d342ab98692f625ecbb37d53e 100644 (file)
--- a/iokit/Kernel/IOBufferMemoryDescriptor.cpp
+++ b/iokit/Kernel/IOBufferMemoryDescriptor.cpp
@@ -25,12 +25,14 @@
 #include <IOKit/IOLib.h>
 #include <IOKit/IOBufferMemoryDescriptor.h>
 
 #include <IOKit/IOLib.h>
 #include <IOKit/IOBufferMemoryDescriptor.h>
 

+#include "IOKitKernelInternal.h"
+

 __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,


@@ -86,7 +88,9 @@ bool IOBufferMemoryDescriptor::initWithOptions(
                                vm_offset_t  alignment,
                               task_t       inTask)
 {
                                vm_offset_t  alignment,
                               task_t       inTask)
 {

-    vm_map_t map = 0;
+    kern_return_t      kr;
+    vm_map_t           vmmap = 0;
+    IOOptionBits       iomdOptions = kIOMemoryAsReference | kIOMemoryTypeVirtual;

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


@@ -97,6 +101,9 @@ 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;
 


@@ -106,38 +113,87 @@ bool IOBufferMemoryDescriptor::initWithOptions(
     _alignment = alignment;
     if (options & kIOMemoryPageable)
     {
     _alignment = alignment;
     if (options & kIOMemoryPageable)
     {

-       if (inTask == kernel_task)
+        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) && (options & kIOMemoryPageable))
+           inTask = kernel_task;
+       else if (inTask == kernel_task)

        {
        {

-           /* Allocate some kernel address space. */
-           _buffer = IOMallocPageable(capacity, alignment);
-           if (_buffer)
-               map = IOPageableMapForAddress((vm_address_t) _buffer);
+           vmmap = kernel_map;

        }
        else
        {
        }
        else
        {

-           kern_return_t kr;

 
            if( !reserved) {
                reserved = IONew( ExpansionData, 1 );
                if( !reserved)
                    return( false );
            }
 
            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 );
+           vmmap = get_task_map(inTask);
+           vm_map_reference(vmmap);
+           reserved->map = vmmap;

        }
     }
     else 
     {
        }
     }
     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);


@@ -145,58 +201,32 @@ bool IOBufferMemoryDescriptor::initWithOptions(
            _buffer = IOMallocAligned(capacity, alignment);
        else
            _buffer = IOMalloc(capacity);
            _buffer = IOMallocAligned(capacity, alignment);
        else
            _buffer = IOMalloc(capacity);

-    }

 
 

-    if (!_buffer)
-       return false;
+       if (!_buffer)
+           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),
-                                inTask, 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;
         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
-    {
-        /* 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 (vmmap)
+       {
+           kr = doMap(vmmap, (IOVirtualAddress *) &_buffer, kIOMapAnywhere, 0, round_page_32(capacity));
+           if (KERN_SUCCESS != kr)
+           {
+               _buffer = 0;
+               return( false );
+           }
+           _singleRange.v.address = (vm_address_t) _buffer;
+       }

     }
 
     setLength(capacity);
     }
 
     setLength(capacity);


@@ -208,7 +238,7 @@ 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 +260,7 @@ 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;
     


@@ -313,45 +343,48 @@ 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_map_t    vmmap     = 0;

     vm_offset_t  alignment = _alignment;
 
     vm_offset_t  alignment = _alignment;
 

-    if (_physAddrs)
-        IODelete(_physAddrs, IOPhysicalAddress, _physSegCount);
-

     if (reserved)
     {
     if (reserved)
     {

-       map = reserved->map;
+       vmmap = reserved->map;

         IODelete( reserved, ExpansionData, 1 );
     }
 
     /* super::free may unwire - deallocate buffer afterwards */
     super::free();
 
         IODelete( reserved, ExpansionData, 1 );
     }
 
     /* super::free may unwire - deallocate buffer afterwards */
     super::free();
 

-    if (buffer)
+    if (options & kIOMemoryPageable)

     {
     {

-        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);
+#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
             else

-                IOFree(buffer, size);
+                IOFreePageable(buffer, size);

         }
     }
         }
     }

-    if (map)
-       vm_map_deallocate(map);
+    else if (buffer)
+    {
+        if (options & kIOMemoryPhysicallyContiguous)
+            IOFreeContiguous(buffer, size);
+        else if (alignment > 1)
+            IOFreeAligned(buffer, size);
+        else
+            IOFree(buffer, size);
+    }
+    if (vmmap)
+       vm_map_deallocate(vmmap);

 }
 
 /*
 }
 
 /*


@@ -438,55 +471,6 @@ 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);