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; $NetBSD: siop.ss,v 1.7 2000/06/13 13:59:15 bouyer Exp $
;
; Copyright (c) 2000 Manuel Bouyer.
;
; Redistribution and use in source and binary forms, with or without
; modification, are permitted provided that the following conditions
; are met:
; 1. Redistributions of source code must retain the above copyright
; notice, this list of conditions and the following disclaimer.
; 2. Redistributions in binary form must reproduce the above copyright
; notice, this list of conditions and the following disclaimer in the
; documentation and/or other materials provided with the distribution.
; 3. All advertising materials mentioning features or use of this software
; must display the following acknowledgement:
; This product includes software developed by Manuel Bouyer
; 4. The name of the author may not be used to endorse or promote products
; derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
; IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
; IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
; NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
; DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
; THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
ARCH 720
; offsets in sym_xfer
ABSOLUTE t_id = 24;
ABSOLUTE t_msg_in = 32;
ABSOLUTE t_ext_msg_in = 40;
ABSOLUTE t_ext_msg_data = 48;
ABSOLUTE t_msg_tag = 56;
ABSOLUTE t_msg_out = 64;
ABSOLUTE t_cmd = 72;
ABSOLUTE t_status = 80;
ABSOLUTE t_data = 88;
;; interrupt codes
ABSOLUTE int_done = 0xff00;
ABSOLUTE int_msgin = 0xff01;
ABSOLUTE int_extmsgin = 0xff02;
ABSOLUTE int_extmsgdata = 0xff03;
ABSOLUTE int_resel = 0xff04;
ABSOLUTE int_reseltag = 0xff05;
ABSOLUTE int_resfail = 0xff06;
ABSOLUTE int_disc = 0xff07;
ABSOLUTE int_err = 0xffff;
; flags for scratcha0
ABSOLUTE flag_sdp = 0x01 ; got save data pointer
ABSOLUTE flag_data = 0x02 ; we're in data phase
ABSOLUTE flag_data_mask = 0xfd ; ~flag_data
ENTRY waitphase;
ENTRY send_msgout;
ENTRY msgout;
ENTRY msgin;
ENTRY msgin_ack;
ENTRY dataout;
ENTRY datain;
ENTRY cmdout;
ENTRY status;
ENTRY disconnect;
ENTRY reselect;
ENTRY selected;
ENTRY get_extmsgdata;
ENTRY slot;
ENTRY idsa0;
ENTRY idsa1;
ENTRY idsa2;
ENTRY idsa3;
ENTRY slotdata;
ENTRY nextslot;
ENTRY endslot;
EXTERN script_abs_shed;
EXTERN slot_nextp;
EXTERN slot_shed_addrsrc;
EXTERN slot_abs_reselect;
EXTERN slot_abs_selected;
EXTERN endslot_abs_reselect;
PROC siop_script:
selected:
; starting a new session, init 'local variables'
MOVE 0 to SCRATCHA0 ; flags
MOVE 0 to SCRATCHA1 ; DSA offset (for S/G save data pointer)
CLEAR ACK;
waitphase:
JUMP REL(msgout), WHEN MSG_OUT;
JUMP REL(msgin), WHEN MSG_IN;
JUMP REL(dataout), WHEN DATA_OUT;
JUMP REL(datain), WHEN DATA_IN;
JUMP REL(cmdout), WHEN CMD;
JUMP REL(status), WHEN STATUS;
err:
INT int_err;
reselect:
WAIT RESELECT REL(reselect_fail)
MOVE SSID & 0x8f to SFBR
MOVE SFBR to SCRATCHA0 ; save reselect ID
INT int_err, WHEN NOT MSG_IN;
MOVE FROM t_msg_in, WHEN MSG_IN;
INT int_resel;
reselect_fail:
; check that host asserted SIGP, this'll clear SIGP in ISTAT
MOVE CTEST2 & 0x40 TO SFBR;
INT int_resfail, IF 0x00;
JUMP script_abs_shed;
msgin:
CLEAR ATN
MOVE FROM t_msg_in, WHEN MSG_IN;
JUMP REL(handle_dis), IF 0x04 ; disconnect message
JUMP REL(handle_cmpl), IF 0x00 ; command complete message
JUMP REL(handle_sdp), IF 0x02 ; save data pointer message
JUMP REL(handle_extin), IF 0x01 ; extended message
INT int_msgin;
msgin_ack:
CLEAR ACK;
JUMP REL(waitphase);
; entry point for msgout after a msgin or status phase
send_msgout:
SET ATN;
CLEAR ACK;
msgout:
MOVE FROM t_msg_out, WHEN MSG_OUT;
CLEAR ATN;
JUMP REL(waitphase);
cmdout:
MOVE FROM t_cmd, WHEN CMD;
JUMP REL(waitphase);
status:
MOVE FROM t_status, WHEN STATUS;
JUMP REL(waitphase);
datain:
CALL REL(savedsa);
MOVE SCRATCHA0 | flag_data TO SCRATCHA0;
datain_loop:
MOVE FROM t_data, WHEN DATA_IN;
MOVE SCRATCHA1 + 1 TO SCRATCHA1 ; adjust offset
MOVE DSA0 + 8 to DSA0;
MOVE DSA1 + 0 to DSA1 WITH CARRY;
MOVE DSA2 + 0 to DSA2 WITH CARRY;
MOVE DSA3 + 0 to DSA3 WITH CARRY;
JUMP REL(datain_loop), WHEN DATA_IN;
CALL REL(restoredsa);
MOVE SCRATCHA0 & flag_data_mask TO SCRATCHA0;
JUMP REL(waitphase);
dataout:
CALL REL(savedsa);
MOVE SCRATCHA0 | flag_data TO SCRATCHA0;
dataout_loop:
MOVE FROM t_data, WHEN DATA_OUT;
MOVE SCRATCHA1 + 1 TO SCRATCHA1 ; adjust offset
MOVE DSA0 + 8 to DSA0;
MOVE DSA1 + 0 to DSA1 WITH CARRY;
MOVE DSA2 + 0 to DSA2 WITH CARRY;
MOVE DSA3 + 0 to DSA3 WITH CARRY;
JUMP REL(dataout_loop), WHEN DATA_OUT;
CALL REL(restoredsa);
MOVE SCRATCHA0 & flag_data_mask TO SCRATCHA0;
JUMP REL(waitphase);
savedsa:
MOVE DSA0 to SFBR;
MOVE SFBR to SCRATCHB0;
MOVE DSA1 to SFBR;
MOVE SFBR to SCRATCHB1;
MOVE DSA2 to SFBR;
MOVE SFBR to SCRATCHB2;
MOVE DSA3 to SFBR;
MOVE SFBR to SCRATCHB3;
RETURN;
restoredsa:
MOVE SCRATCHB0 TO SFBR;
MOVE SFBR TO DSA0;
MOVE SCRATCHB1 TO SFBR;
MOVE SFBR TO DSA1;
MOVE SCRATCHB2 TO SFBR;
MOVE SFBR TO DSA2;
MOVE SCRATCHB3 TO SFBR;
MOVE SFBR TO DSA3;
RETURN;
disconnect:
MOVE SCNTL2 & 0x7f TO SCNTL2;
CLEAR ATN;
CLEAR ACK;
WAIT DISCONNECT;
RETURN;
handle_dis:
CALL REL(disconnect);
; if we didn't get sdp, or if offset is 0, no need to interrupt
MOVE SCRATCHA0 & flag_sdp TO SFBR;
JUMP script_abs_shed, if 0x00;
MOVE SCRATCHA1 TO SFBR;
JUMP script_abs_shed, if 0x00;
; Ok, we need to save data pointers
INT int_disc;
handle_cmpl:
CALL REL(disconnect);
INT int_done;
handle_sdp:
CLEAR ACK;
MOVE SCRATCHA0 | flag_sdp TO SCRATCHA0;
JUMP REL(msgin) ; should get a disconnect message now
handle_extin:
CLEAR ACK;
INT int_err, IF NOT MSG_IN;
MOVE FROM t_ext_msg_in, WHEN MSG_IN;
INT int_extmsgin; /* let host fill in t_ext_msg_data */
get_extmsgdata:
CLEAR ACK;
INT int_err, IF NOT MSG_IN;
MOVE FROM t_ext_msg_data, WHEN MSG_IN;
INT int_extmsgdata;
; script used for the scheduler: when a slot is free the JUMP points to
; the next slot so that instructions for this slot are not run.
; once the CPU has set up the slot variables (DSA address) it changes
; the JUMP address to 0 (so that it'll jump to the next instruction) and
; this command will be processed next time the scheduler is executed.
; When the target has been successfully selected the script changes the jump
; addr back to the next slot, so that it's ignored the next time.
;
PROC slot_script:
slot:
JUMP REL(nextslot);
idsa0:
MOVE 0x00 to dsa0;
idsa1:
MOVE 0x01 to dsa1;
idsa2:
MOVE 0x02 to dsa2;
idsa3:
MOVE 0x03 to dsa3;
SELECT ATN FROM t_id, slot_abs_reselect;
MOVE MEMORY 4, slot_shed_addrsrc, slot_nextp;
JUMP slot_abs_selected;
slotdata:
NOP; slot variables: dsa & jumppatchp
nextslot: NOP; /* will be changed to the next slot entry
PROC endslot_script:
JUMP endslot_abs_reselect;
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