iokit/Kernel/IOMemoryDescriptor.cpp

146     uint32_t fIOMDOffset;	    // The offset of this iopl in descriptor
147     ppnum_t fMappedPage;	    // Page number of first page in this iopl
148     unsigned int fPageOffset;	    // Offset within first page of iopl
754         ioPLBlock iopl;
755         iopl.fIOPL = (upl_t) buffers;
756         upl_set_referenced(iopl.fIOPL, true);
757         upl_page_info_t *pageList = UPL_GET_INTERNAL_PAGE_LIST(iopl.fIOPL);
759 	if (upl_get_size(iopl.fIOPL) < (count + offset))
762         _highestPage = upl_get_highest_page(iopl.fIOPL);
765         iopl.fFlags  = pageList->device | kIOPLExternUPL;
771         iopl.fIOMDOffset = 0;
772         iopl.fMappedPage = 0;
773         iopl.fPageInfo = (vm_address_t) pageList;
774         iopl.fPageOffset = offset;
775         _memoryEntries->appendBytes(&iopl, sizeof(iopl));
1433 	// Scan through iopl info blocks looking for block containing offset
1445 	length -= offset;			// Remainder within iopl
1447 	// Subtract offset till this iopl in total list
1458 	// The offset is rebased into the current iopl.
1459 	// Now add the iopl 1st page offset.
1487 	// length is currently set to the length of the remainider of the iopl.
1488 	// We need to check that the remainder of the iopl is contiguous.
2123         ioPLBlock iopl;
2130 	iopl.fPageOffset = startPage & PAGE_MASK;
2131 	numBytes += iopl.fPageOffset;
2135 	    iopl.fMappedPage = mapBase + pageIndex;
2137 	    iopl.fMappedPage = 0;
2164 						&iopl.fIOPL,
2173 						&iopl.fIOPL,
2183 						&iopl.fIOPL,
2193 	    if (iopl.fIOPL)
2194 		highPage = upl_get_highest_page(iopl.fIOPL);
2202                 iopl.fFlags  = kIOPLOnDevice;
2205                 iopl.fFlags = 0;
2208             iopl.fIOMDOffset = mdOffset;
2209             iopl.fPageInfo = pageIndex;
2214 	    if ((_flags & kIOMemoryAutoPrepare) && iopl.fIOPL)
2216 		upl_commit(iopl.fIOPL, 0, 0);
2217 		upl_deallocate(iopl.fIOPL);
2218 		iopl.fIOPL = 0;
2222             if (!_memoryEntries->appendBytes(&iopl, sizeof(iopl))) {
2223                 // Clean up partial created and unsaved iopl
2224                 if (iopl.fIOPL) {
2225                     upl_abort(iopl.fIOPL, 0);
2226                     upl_deallocate(iopl.fIOPL);
2232             // Check for a multiple iopl's in one virtual range
2234             mdOffset -= iopl.fPageOffset;
2239                 iopl.fPageOffset = 0;
2240 		if (mapper) iopl.fMappedPage = mapBase + pageIndex;