iokit/Kernel/IODMACommand.cpp

1023     Segment64 curSeg = { 0, 0 };
1076 		if ((curSeg.fIOVMAddr + curSeg.fLength) == state->fIOVMAddr) {
1079 		    curSeg.fLength  += length;
1090 	if (!curSeg.fIOVMAddr)
1094 	    curSeg.fIOVMAddr = state->fIOVMAddr | bypassMask;
1095 	    curSeg.fLength   = length;
1101 	    if ((kWalkClient & op) && (curSeg.fIOVMAddr + curSeg.fLength - 1) > maxPhys)
1105 		    curSeg.fIOVMAddr = 0;
1109 		else if (curSeg.fIOVMAddr <= maxPhys)
1113 		    newLength	     = (maxPhys + 1 - curSeg.fIOVMAddr);
1114 		    DEBG("trunc %qx, %qx-> %qx\n", curSeg.fIOVMAddr, curSeg.fLength, newLength);
1115 		    remain	     = curSeg.fLength - newLength;
1116 		    state->fIOVMAddr = newLength + curSeg.fIOVMAddr;
1117 		    curSeg.fLength   = newLength;
1123 		    UInt64    addr = curSeg.fIOVMAddr;
1128 		    DEBG("sparse switch %qx, %qx ", addr, curSeg.fLength);
1142 		    curSeg.fIOVMAddr = ptoa_64(vm_page_get_phys_page(remap))
1147 		    if (newLength < curSeg.fLength)
1149 			remain		 = curSeg.fLength - newLength;
1151 			curSeg.fLength	 = newLength;
1155 		    DEBG("-> %qx, %qx offset %qx\n", curSeg.fIOVMAddr, curSeg.fLength, offset);
1159 	    if (curSeg.fLength > fMaxSegmentSize)
1161 		UInt64 remain = curSeg.fLength - fMaxSegmentSize;
1163 		state->fIOVMAddr = fMaxSegmentSize + curSeg.fIOVMAddr;
1164 		curSeg.fLength   = fMaxSegmentSize;
1171 		&& (0 != (internalState->fSourceAlignMask & curSeg.fIOVMAddr)))
1173 		curSeg.fIOVMAddr = 0;
1180 		curSeg.fLength   -= (offset - memLength);
1191 	    ret = (*outSegFunc)(reference, this, curSeg, segmentsP, segIndex++);
1192             curSeg.fIOVMAddr = 0;
1198     if (curSeg.fIOVMAddr) {
1199 	ret = (*outSegFunc)(reference, this, curSeg, segmentsP, segIndex++);