// // Definitions for VMEM package // last edited December 18, 1978 9:10 AM // // Copyright Xerox Corporation 1979 structure BPT: [ HASHX byte NEXT byte // NEXT MUST BE IN LOW PART OF WORD // (FOR @bpt) ] manifest NEXTmask = #377 structure HM: [ NKEY word // 1's complement of key FLAGWD word = [ PDIF bit 8 // real page # - virtual AC1[0:7] FLAGS bit 8 = [ WGROUP bit 1 // this is a write group GROUP bit 2 = [ NFPG bit 1 // not first page of group NLPG bit 1 // not last page of group ] blank bit 1 DUMMY bit 1 NOTREF bit 1 // *** used by microcode CLEAN bit 1 // *** used by microcode blank bit 1 ] ] ] manifest HMflagOffset = 1 structure LC: [ addr word proc word ] manifest LCsize = 2 manifest [ PS = 8 // LOG2(VM PAGE SIZE) WM = (1 lshift PS)-1 RepInc = 26 // hash map reprobe increment BptSize = #400 // # of buffers EmptyVP = -2 // pseudo VP for empty buffers NaVP = -3 // pseudo VP for unavailable buffers MinDummyVP = -8 ] manifest [ CLEANbit = #2 NOTREFbit = #4 DUMMYbit = #10 NLPGbit = #40 NFPGbit = #100 GROUPbits = NLPGbit+NFPGbit WGROUPbit = #200 ]