154 lines
3.3 KiB
Scheme
154 lines
3.3 KiB
Scheme
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ARCH 720
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; offsets of sym_xfer
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ABSOLUTE t_id = 4;
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ABSOLUTE t_msg_in = 12;
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ABSOLUTE t_msg_out = 20;
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ABSOLUTE t_cmd = 28;
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ABSOLUTE t_status = 36;
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ABSOLUTE t_data = 44;
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;; interrupt codes
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ABSOLUTE int_done = 0xff00;
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ABSOLUTE int_msgin = 0xff01;
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ABSOLUTE int_resel = 0xff02;
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ABSOLUTE int_resfail = 0xff03;
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ABSOLUTE int_disc = 0xff04;
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ABSOLUTE int_err = 0xffff;
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; flags for scratcha0
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ABSOLUTE flag_sdp = 0x01 ; got save data pointer
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ENTRY waitphase;
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ENTRY select;
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ENTRY msgout;
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ENTRY msgin;
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ENTRY dataout;
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ENTRY datain;
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ENTRY cmdout;
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ENTRY status;
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ENTRY disconnect;
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ENTRY reselect;
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ENTRY reselected;
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ENTRY handle_reselect;
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PROC siop_script:
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select:
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SELECT ATN FROM t_id, REL(reselect);
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reselected:
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; starting a new session, init 'local variables'
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MOVE 0 to SCRATCHA0 ; flags
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MOVE 0 to SCRATCHA1 ; DSA offset (for S/G save data pointer)
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waitphase:
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JUMP REL(msgout), WHEN MSG_OUT;
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JUMP REL(msgin), WHEN MSG_IN;
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JUMP REL(dataout), WHEN DATA_OUT;
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JUMP REL(datain), WHEN DATA_IN;
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JUMP REL(cmdout), WHEN CMD;
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JUMP REL(status), WHEN STATUS;
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err:
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INT int_err;
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reselect:
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WAIT RESELECT REL(reselect_fail)
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MOVE SSID & 0x8f to SFBR
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MOVE SFBR to SCRATCHA0 ; save reselect ID
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INT int_err, WHEN NOT MSG_IN;
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MOVE FROM t_msg_in, WHEN MSG_IN;
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CLEAR ACK;
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INT int_resel;
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reselect_fail:
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INT int_resfail;
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msgin:
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CLEAR ATN
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MOVE FROM t_msg_in, WHEN MSG_IN;
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JUMP REL(handle_dis), IF 0x04 ; disconnect message
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JUMP REL(handle_cmpl), IF 0x00 ; command complete message
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JUMP REL(handle_sdp), IF 0x02 ; save data pointer message
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INT int_msgin;
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msgout:
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MOVE FROM t_msg_out, WHEN MSG_OUT;
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CLEAR ATN;
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JUMP REL(waitphase);
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cmdout:
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MOVE FROM t_cmd, WHEN CMD;
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JUMP REL(waitphase);
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status:
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MOVE FROM t_status, WHEN STATUS;
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JUMP REL(waitphase);
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datain:
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CALL REL(savedsa);
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datain_loop:
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MOVE FROM t_data, WHEN DATA_IN;
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MOVE SCRATCHA1 + 1 TO SCRATCHA1 ; adjust offset
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MOVE DSA0 + 8 to DSA0;
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MOVE DSA1 + 0 to DSA1 WITH CARRY;
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MOVE DSA2 + 0 to DSA2 WITH CARRY;
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MOVE DSA3 + 0 to DSA3 WITH CARRY;
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JUMP REL(datain_loop), WHEN DATA_IN;
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CALL REL(restoredsa);
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JUMP REL(waitphase);
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dataout:
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CALL REL(savedsa);
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dataout_loop:
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MOVE FROM t_data, WHEN DATA_OUT;
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MOVE SCRATCHA1 + 1 TO SCRATCHA1 ; adjust offset
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MOVE DSA0 + 8 to DSA0;
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MOVE DSA1 + 0 to DSA1 WITH CARRY;
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MOVE DSA2 + 0 to DSA2 WITH CARRY;
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MOVE DSA3 + 0 to DSA3 WITH CARRY;
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JUMP REL(dataout_loop), WHEN DATA_OUT;
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CALL REL(restoredsa);
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JUMP REL(waitphase);
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savedsa:
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MOVE DSA0 to SFBR;
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MOVE SFBR to SCRATCHB0;
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MOVE DSA1 to SFBR;
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MOVE SFBR to SCRATCHB1;
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MOVE DSA2 to SFBR;
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MOVE SFBR to SCRATCHB2;
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MOVE DSA3 to SFBR;
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MOVE SFBR to SCRATCHB3;
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RETURN;
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restoredsa:
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MOVE SCRATCHB0 TO SFBR;
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MOVE SFBR TO DSA0;
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MOVE SCRATCHB1 TO SFBR;
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MOVE SFBR TO DSA1;
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MOVE SCRATCHB2 TO SFBR;
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MOVE SFBR TO DSA2;
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MOVE SCRATCHB3 TO SFBR;
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MOVE SFBR TO DSA3;
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RETURN;
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disconnect:
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MOVE SCNTL2 & 0x7f TO SCNTL2;
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CLEAR ATN;
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CLEAR ACK;
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WAIT DISCONNECT;
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RETURN;
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handle_dis:
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CALL REL(disconnect);
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; if we didn't get sdp, or if offset is 0, no need to interrupt
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MOVE SCRATCHA0 & flag_sdp TO SFBR;
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JUMP REL(reselect), if 0x00;
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MOVE SCRATCHA1 TO SFBR;
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JUMP REL(reselect), if 0x00;
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; Ok, we need to save data pointers
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INT int_disc;
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handle_cmpl:
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CALL REL(disconnect);
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INT int_done;
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handle_sdp:
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CLEAR ACK;
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MOVE SCRATCHA0 | flag_sdp TO SCRATCHA0;
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JUMP REL(msgin) ; should get a disconnect message now
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