iAPX 286 Operating System Writers Guide 1983

iAPX2~6 MACRO ASSEMBLEREnter Protect~d Modi 960-516 d .. te PAGE9lLaCOBJLINESOURCE-'"0.!..I\)~~o~016F 3C070111 580172 75010174 C301750115 Flo01760176 8COO017S 8ECD017A 26C6H0592017F 26C7470600000185 OF03C30188 88C8018A E8DFFF01S0 BF08000190 SEOF0192 BF1S000195 570196 AD0197 E9D2FF019A AS0198 A5019C AS0190 AS019E 07019F SED83283293303313323333343353363373383393403413423433443453463473483493503513523533543S5356357358359360361362363364365366367368369 +1370371372373C"IPPOPJNER~TBAD_oT_LIMIT:lilTTEST_OT _LIMITAl,7AXSAo_oT_LIMITENoPMust be all oneSRestore lengthAll OKOie!Copy tho EPROM OT at selector ex in the temporary GOT to tha aliasdata se~ment at selector S1. Any i~proper descriptors or limitscause shutdownl .COPY_cPROM_OTHOVMOVMaVMOVLSLMOVCALLMOVMOVHOVPUSHLOOSWCALLSTOSWHOVSWMOVSWMOVSWPOPMOVCOPY_EPROM_OT$EJECTPRecAX,SSES,AXES:CBXJ.ACCESS,OS_ACC:SS;ES:ESXJ.RES,OAX,BXCX,AXTEST_OT _LIMITOI,GOT_oESC-1N1T1Al_GOT05,0101,TEMP_OESC-INITIAL_GOT;orTEST_OT_LIMITESOS,BXENDP• Point ES:OI at temporary descriptorMark descriptor as a dataClear reserved wordGet limit of =PROM OTSave for laterVerify it is • proper limitAddress EPROM GOT in OSS991l1entGet selector for temporary descriptorSave offs~.t for later us. as selectorGat. alias segment sizeVerify it is an even multiple ofdescriptors i~ lengthPut length into temporaryCOP.Y r.entCtinir:'9 entries into temporaryES now points at the GOT .lias areaOS now points at EPROM DT as dataCopy segment to alias with zero fillCX is copy count, AX-CX is fill countFall into COPY_W1T~_FILLCopy the segMent at OS to the segment at =S for length CX.Fill the end .it~ AX-eX Zeroes. Use word oper.tions for speed butallow odd byte operations.Figure 10-1. Initialization Module ENTP (Cont'd.)enen--IoZ