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annotate level2/modules/kernel/fdatlog.asm @ 3295:6b7a7b233925 default tip

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makefile: Allow PORTS with level1/2 mix https://sourceforge.net/p/nitros9/feature-requests/10/
author Tormod Volden <debian.tormod@gmail.com>
date Tue, 19 Apr 2022 18:12:17 +0200
parents 039ddb7c8ad7
children
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1 **************************************************
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2 * System Call: F$DATLog
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3 *
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4 * Function: Convert DAT block/offset to logical address
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5 *
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6 * Input: B = DAT image offset
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7 * X = Block offset
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8 *
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9 * Output: X = Logical address
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10 *
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11 * Error: CC = C bit set; B = error code
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12 *
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13 FDATLog ldb R$B,u Get logical Block #
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14 ldx R$X,u Get offset into block
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15 bsr CmpLBlk Go modify X to be Logical address
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16 stx R$X,u Save in callers X register
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17 clrb No error & return
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18 rts
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19
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20 * Compute logical address given B=Logical Block # & X=offset into block
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21 * Exits with B being logical block & X=logical address
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22 CmpLBlk pshs b Preserve logical block #
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23 tfr b,a Move log. block # to A
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24 lsla Multiply logical block by 32
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25 lsla
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26 lsla
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27 lsla
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28 lsla
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29 clrb D=8k offset value
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30 IFNE H6309
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31 addr d,x X=logical address in 64k workspace
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32 ELSE
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33 leax d,x
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34 ENDC
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35 puls b,pc Restore A, block # & return