// IfsLeafVMem.decl - Leaf VMem - Declarations // Copyright Xerox Corporation 1979, 1980 // Last modified by Wobber, November 21, 1980 1:14 PM get "IfsVmem.decl" manifest [ leafVMemPages = 40; lastLeafPage = leafVMemPages-1; lenLeafHashTable = 256; logVPagesPerLeafPage = 2; leafPageGroupSize = logVPagesPerLeafPage; logLenLeafHashTable = 8; probeMask = #377; firstFreePage = 128; freePageMask = 128; maxFreePageCount = 128; noFree = 0; ] //--------------------------------------------------------------------------- structure LeafPage: //--------------------------------------------------------------------------- [ address word // N.B. LeafLock assumes address is first word lvmd word; page word; flagByte byte = [ dirty bit 1; blank bit 1; dontRead bit 1; flushLock bit 5 = [ writing bit 1; locked bit 1; readRefs bit 3; ] ] probe byte; ] manifest lenLeafPage = size LeafPage/16; manifest logLenLeafPage = 2; //--------------------------------------------------------------------------- structure LeafVMI: //--------------------------------------------------------------------------- [ vmi @VMI vmd @VMD lvmdQueue: [ head word; tail word; ] lastFreeProbe word // next entry index to use is passed back here by LeafHash hashTable^0,lenLeafHashTable-1 byte freePage word; freePageCount word fullProbes word 2 freeProbes word 2 pages^0,leafVMemPages @LeafPage // waste the 0 entry ] manifest lenLeafVMI = size LeafVMI/16; //--------------------------------------------------------------------------- structure LeafILD: //--------------------------------------------------------------------------- [ @ILD; blank word (2*256 - size ILD/16); // Position fmap on 2nd half of leader page. fmapWritten @TIME fmapChecksum word; fmapLast word; fmapFP @FP; fmapSeal word; fmap^0,0 word ] manifest lenLeafFMap = 32; manifest leafFMapDelta = 32; // must be even manifest maxLenOldFMap = (3*256 - offset LeafILD.fmap/16);