+struct IOMemoryDescriptorDevicePager {
+ void * devicePager;
+ unsigned int pagerContig:1;
+ unsigned int unused:31;
+ IOMemoryDescriptor * memory;
+};
+
+struct IOMemoryDescriptorReserved {
+ IOMemoryDescriptorDevicePager dp;
+ uint64_t preparationID;
+ // for kernel IOMD subclasses... they have no expansion
+ uint64_t kernReserved[4];
+ vm_tag_t kernelTag;
+ vm_tag_t userTag;
+};
+
+struct iopa_t
+{
+ IOLock * lock;
+ queue_head_t list;
+ vm_size_t pagecount;
+ vm_size_t bytecount;
+};
+
+struct iopa_page_t
+{
+ queue_chain_t link;
+ uint64_t avail;
+ uint32_t signature;
+};
+typedef struct iopa_page_t iopa_page_t;
+
+typedef uintptr_t (*iopa_proc_t)(iopa_t * a);
+
+enum
+{
+ kIOPageAllocSignature = 'iopa'
+};
+
+extern "C" void iopa_init(iopa_t * a);
+extern "C" uintptr_t iopa_alloc(iopa_t * a, iopa_proc_t alloc, vm_size_t bytes, uint32_t balign);
+extern "C" uintptr_t iopa_free(iopa_t * a, uintptr_t addr, vm_size_t bytes);
+extern "C" uint32_t gIOPageAllocChunkBytes;
+
+extern "C" iopa_t gIOBMDPageAllocator;
+