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galaxy-sources/glxots.mac
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TITLE GLXOTS - Primary Module for GALAXY Runtime System
SUBTTL Preliminaries
; COPYRIGHT (c) DIGITAL EQUIPMENT CORPORATION 1975, 1988.
; ALL RIGHTS RESERVED.
;
; THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND COPIED
; ONLY IN ACCORDANCE WITH THE TERMS OF SUCH LICENSE AND WITH THE
; INCLUSION OF THE ABOVE COPYRIGHT NOTICE. THIS SOFTWARE OR ANY OTHER
; COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO ANY
; OTHER PERSON. NO TITLE TO AND OWNERSHIP OF THE SOFTWARE IS HEREBY
; TRANSFERRED.
;
; THE INFORMATION IN THIS SOFTWARE IS SUBJECT TO CHANGE WITHOUT NOTICE
; AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
; CORPORATION.
;
; DIGITAL ASSUMES NO RESPONSIBILITY FOR THE USE OR RELIABILITY OF ITS
; SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY DIGITAL.
SEARCH GLXMAC ;LOAD COMMON DEFINITIONS
PROLOG(GLXOTS,OTS) ;
OTSMAN==:0 ;Maintenance edit number
OTSDEV==:21 ;Development edit number
VERSIN (OTS) ;Generate edit number
;The purpose of this module is to provide a common access mechanism
; for the GALAXY object time system. When the library is loaded correctly
; this module starts at location VORG, defined in GLXMAC.
; The only code in this module is the library dispatch vector
; which is used to find routines and variables in the library.
;
; In the case of the library being loaded as a .REL file,
; this module generates no code, since there is no need for an
; dispatch vector
Subttl Table of Contents
; Table of Contents for GLXOTS
;
; Section Page
;
;
; 1. Revision history . . . . . . . . . . . . . . . . . . . 3
; 2. Check for neccessity of this module . . . . . . . . . 4
; 3. Library Dispatch Vector . . . . . . . . . . . . . . . 5
; 4. Object Time System
; 4.1 Initial startup . . . . . . . . . . . . . . . 6
; 4.2 Data page creation . . . . . . . . . . . . . . 7
; 5. End . . . . . . . . . . . . . . . . . . . . . . . . . 8
SUBTTL Revision history
COMMENT \
7 4/6/81
Add "start address" for beginning of dispatch table.
***** Release 4.2 -- begin maintenance edits *****
***** Release 5.0 -- begin development edits *****
12 5.1002 28-Dec-82
Move to new development area. Clean up edit organization. Update TOC.
***** Release 5.0 -- begin maintenance edits *****
15 Increment maintenance edit level for version 5 of GALAXY.
***** Release 6.0 -- begin development edits *****
20 6.1037 26-Oct-87
Move sources from G5: to G6:
21 6.1225 8-Mar-88
Update copyright notice.
\ ;End of Revision History
SUBTTL Check for neccessity of this module
;Since GLXOTS is the first module loaded, define the start of the data space
$GDATA D%BEG,0 ;First location in the data pages
$DATA OTSDAT,0 ;Dummy data slot for OTS
SUBTTL Library Dispatch Vector
; This vector is used by all non-OTS modules to dispatch to the
; proper routines in the OTS.
;
IFN GLXPURE,< ;;IF OTS
DEFINE CDO (X),< ;;MACRO TO DEFINE ENTRY POINTS
IFB <X>,<PORTAL .UNRTN> ;;UNIMPLEMENTED ROUTINES
IFNB <X>,< ;;FOR DEFINED ENTRY POINTS...
GLOB X ;;DECLARE GLOBAL SYMBOM
PORTAL X ;;POINT TO ENTRY
> ;;END OF IFNB <X> CONDITIONAL
> ;;END OF CDO MACRO
> ;;END OF IFN GLXPURE CONDITIONAL
IFE GLXPURE,< ;;IF LINKABLE LIBRARY
DEFINE CDO (X),< ;;MACRO TO DEFINE ENTRY POINTS
IFNB <X>,<GLOB X> ;;DECLARE SYMBOL GLOBAL
> ;;END OF CDO MACRO
> ;;END OF IFE GLXPURE CONDITIONAL
LSTOF. ;TURN OFF LISTING
GLXOTS::LIBVEC ;DEFINE ENTRY VECTOR
LSTON. ;TURN ON LISTING
.UNRTN::$STOP (UNR,Unimplemented routine executed) ;++ NON-EXISTENT ROUTINES
.OBRTN::$STOP (OBR,Obsolete routine executed) ;++ ANCIENT ROUTINES
.OORTN::$STOP (OOR,OTS only routine executed) ;++ SHOULD NEVER HAPPEN
SUBTTL Object Time System -- Initial startup
; Here from GLXINI (the bootstrap module). This code is only needed if
; the user acceses the library as an OTS high segment.
;
; Create the library's data pages. On TOPS-10, this requires 2 PAGE. UUOs.
; The first to create the page fault handler's data page just below the high
; segment origin. The second create the actual data pages referenced by all
; GLXLIB modules. On TOPS-20, there is no page fault handler. Creating the
; data pages requires touching each page. A BLT (through a call to .ZCHNK)
; does this nicely.
;
; Once the data pages have been created, OTS initialization is completed
; by calling I%INIT in GLXINT.
;
OTSINI:
IFE GLXPURE,< ;IF LINKABLE LIBRARY
PUSHJ P,.OORTN ;HOW DID WE GET HERE ??
> ;END OF IFE GLXPURE CONDITIONAL
IFN GLXPURE,< ;IF OTS
HLRZ TF,S1 ;GET VERSION # LOADED GY GLXINI
CAIE TF,%%.GLX ;SKEW ?
JRST [MOVEI S1,OTSERR ;POINT TO ERROR TEXT
$CALL K%SOUT ;TYPE IT
$CALL I%EXIT] ;STOP
HRRZS S1 ;STRIP OFF VERSION
PUSH P,S1 ;SAVE S1
PUSH P,S2 ;SAVE S2
PUSHJ P,CREDAT ;CREATE THE PAGES
POP P,S2 ;RESTORE S2
POP P,S1 ;RESTORE S1
SETOM OTSDAT ;INDICATE GETSEG OCCURED
PJRST I%INIT ;COMPLETE INITIALIZATION
OTSERR: ASCIZ |? GLXLIB version skew; recompile this program|
SUBTTL Object Time System -- Data page creation
CREDAT:
TOPS10 < ;TOPS-10 ONLY
MOVEI TF,D%END## ;GET LAST PAGE LOCATION
ADR2PG TF ;CONVERT TO A PAGE NUMBER
HRLI TF,.PAGCA ;SET UP PAGE. UUO FUNCTION
PAGE. TF, ;READ PAGE ACCESS CODES
TXO TF,PA.GNE ;CAN'T - ASSUME NOT THERE AND TRY CREATE
TXNN TF,PA.GNE ;PAGE EXIST ?
POPJ P, ;YES - ASSUME ALL PAGES THERE AND RETURN
MOVE TF,[.PAGCD,,S1] ;SET UP PAGE. UUO
MOVEI S1,D%END##-D%BEG ;GET NUMBER OF WORDS IN THE DATA PAGES
TXZE S1,PAGSIZ-1 ;FRACTION OF A PAGE ?
ADDI S1,PAGSIZ ;YES - ROUND UP
ADR2PG S1 ;CONVERT TO PAGE NUMBER
MOVNS S1 ;MAKE NEGATIVE REPEAT COUNT
MOVEI S2,D%BEG ;GET STARTING DATA PAGE ADDRESS
ADR2PG S2 ;CONVERT TO A PAGE NUMBER
PAGE. TF, ;CREATE THE LIBRARY DATA PAGES
SKIPA ;CAN'T
POPJ P, ;RETURN
CREERR: OUTSTR [ASCIZ |? GLXOTS - Library data page create failed|]
$HALT ;STOP
JRST .-1 ;DON'T CONTINUE
> ;END OF TOPS-10 CONDITIONAL
TOPS20 < ;TOPS-20 ONLY
XMOVEI S1,D%BEG-D%END## ;GET LENGTH OF PAGE PAGES
XMOVEI S2,D%END## ;POINT TO LAST DATA WORD
$CALL .ZCHNK ;ZAP ALL WORDS
POPJ P, ;RETURN
> ;END OF TOPS-20 CONDITIONAL
> ;END OF IFN GLXPURE CONDITIONAL
SUBTTL End
OTS%L:
IFN GLXPUR<
END GLXOTS>
IFE GLXPUR<
END>