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JOHNSTON
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1989-05-24
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1
PROCEDURE ValueDemo(A: CARDINAL; B: INTEGER; F: REAL;
Str: String20);
.
.
-----------------------------------------------------
.
.
A := 1; {A is a CARDINAL}
B := -1; {B is an INTEGER}
F := 10.384; {F is a REAL}
Str := 'Hello There!'; {Str is an ARRAY[0..19] OF CHAR}
ValueDemo(a, B, F, Str);
At the call to ValueDemo the stack is set up as follows:
+---------+---------+
BP + 14H | Value of A |
+---------+---------+
BP + 12H | Value of B |
+---------+---------+
| Word 1 of F |
+---------+---------+
| Word 2 of F |
+---------+---------+
| Word 3 of F |
+---------+---------+
BP + 0AH | Word 4 of F |
+---------+---------+
| Seg of Str |
+---------+---------+
BP + 06H | Ofst of Str |
+---------+---------+
BP + 04H | Return Segment |
+---------+---------+
BP + 02H | Address Offset |
+---------+---------+
BP + 00H | Old BP |
+---------+---------+
Figure 1. Procedure code and stack for a procedure whose parameters
are called by value.
2
PROCEDURE OpenArrayProc(VAR TestArray: ARRAY OF CHAR;
OtherArray : ARRAY OF CHAR);
.
.
----------------------------------------------------------
.
.
VAR
TestArray,
OtherArray: ARRAY[0..19] OF CHAR;
.
.
.
TestArray := 'This is a Test';
OtherArray := 'This is the other array';
OpenArrayProc(TestArray, OtherArray);
At the call to ValueDemo the stack is set up as follows:
+---------+---------+
BP + 10H | Max Index of |
| TestArray |
+---------+---------+
| Seg of TestArray |
+---------+---------+
BP + 0CH | Ofst of TestArray |
+---------+---------+
BP + 0AH | Max Index of |
| OtherArray|
+---------+---------+
| Seg of OtherArray |
+---------+---------+
BP + 06H | Ofst of OtherArray|
+---------+---------+
BP + 04H | Return Segment |
+---------+---------+
BP + 02H | Address Offset |
+---------+---------+
BP + 00H | Old BP |
+---------+---------+
Figure 2. Procedure code and stack for a procedure whose arguments
are open arrays.
3
FOREIGN DEFINITION MODULE NetNNN;
(*
Title : NetNNN
LastEdit: 4-May-88 13:33
Author : J. C. Johnston
System : Network Tools No-wait Name Procedures
Compiler: LOGITECH MODULA-2 V3.03
*)
FROM NetDefs IMPORT NetNameStr;
EXPORT QUALIFIED
NNNADD, NNNADG, NNNRMV;
PROCEDURE NNNADD(VAR NTErr, NTErr1, Adapter : INTEGER;
VAR NetName: NetNameStr;
VAR NameNumber : INTEGER);
(* Alternate No-Wait Add a name *)
PROCEDURE NNNADG(VAR NTErr, NTErr1, Adapter: INTEGER;
VAR GrpName : NetNameStr;
VAR GrpNum : INTEGER);
(* Alternate No-wait add a group name *)
PROCEDURE NNNRMV(VAR NTErr, NTErr1, Adapter : INTEGER;
VAR NetName : NetNameStr);
(* Alternate No-wait Remove a group name *)
END NetNNN.
Figure 4. Example Definition Module for Network Tools code.
4
;
; Notice that the following variable is in the code segment
;
DStore DW ? ; hold the DS Register
;
;
L__FGDrawLines__IRISGraf PROC FAR ;
;
;
; PROCEDURE FGDrawLines(FrameNo, PointCount : CARDINAL;
; VAR PointArray: ILUTArrayType): CARDINAL;
; (* draws a line through each point specified in the array *)
;
;
PArray = 6
PCount = PArray+4
FrameNo = PCount+2
;
PUSH BP
MOV BP,SP
MOV CS:DStore,DS ;save the Current DS
MOV AX,[BP]+FrameNo ;get the parameter
PUSH AX ;push it
MOV AX,[BP]+PCount ;get the parameter
PUSH AX ;push it
LDS AX,[BP]+PArray
PUSH DS
PUSH AX
CALL IS_DRAW_LINES ;
MOV DS,CS:DStore ;get DS back
MOV SP,BP ; reset stack pointer
POP BP ;restore BP
RET 08H
;
L__FGDrawLines__IRISGraf ENDP
Figure 5. Building an Iris call from a Modula-2 call.
1
PAGE ,132
.LALL
;
;IRISINIT - M2 Interface for DT-IRIS isinit module
;-----------------
;
;Interface for Data Translation IRIS isinit Module
;to LOGITECH MODULA Version 3
;
; The purpose of this module is to provide an interface between
; the Logitech M2 compiler and the DT-IRIS library. The DT-IRIS
; library is written to link to the Microsoft Pascal Compiler.
; The library code, as supplied by Data Translation, assumes the
; use of FAR calls to reach the library functions and NEAR
; references to parameters passed by reference.
;
; The Modula compiler uses FAR calls to communicate with procedures
; in external modules but passes parameters by reference using
; FAR references.
;
; In an effort to correct for this mismatch, all of the variables
; passed from by reference between the DT-IRIS library and the
; Modula program will be defined in a seperate module. This
; should insure that all of the data will be in the same
; data segment.
;
; Modula strings are ASCIIZ as are DT-IRIS strings. MS Pascal
; strings use the 0th element to hold the string length. If
; this presents a problem, it may have to be dealt with here also.
;
;
;*****************************************************************
;* *
;* Author: Chris Johnston (March 1988) *
;* Microgravity Materials Science Laboratory *
;* NASA Lewis Research Center *
;* 21000 Brookpark Road MS 105-1 *
;* Cleveland, Ohio 44132 *
;* (216) 433-5029 *
;* *
;*****************************************************************
;
;
;
TITLE IRISInit
;
DGROUP GROUP DATA
;
; Exported Procedures
;
PUBLIC L__FGInit__IRISInit
PUBLIC L__FGAbort__IRISInit
PUBLIC L__FGConfig__IRISInit
PUBLIC L__FGReset__IRISInit
2
PUBLIC L__FGEnd__IRISInit
PUBLIC L__FGTest__IRISInit
;
;
; Initialization Entry point
;
PUBLIC $INIT__IRISInit
PUBLIC $BODY__IRISInit
;
;
; Exported Variables
;
; Cardinals
;
PUBLIC ExternTriggerStatus__IRISInit, IVal__IRISInit
PUBLIC RedVal__IRISInit, GreenVal__IRISInit, BlueVal__IRISInit
PUBLIC RowAddr__IRISInit, ColAddr__IRISInit, RowPos__IRISInit
PUBLIC ColumnPos__IRISInit
;
; Frame ID array
;
PUBLIC FrameID__IRISInit
;
; Long Integers
;
PUBLIC FGMemFailAddr__IRISInit, RsltSum__IRISInit
;
; Config Array
;
PUBLIC FGConfiguration__IRISInit
;
; ILUT arrays
;
PUBLIC PointArray__IRISInit
PUBLIC ILUTArray__IRISInit, RedArray__IRISInit
PUBLIC GreenArray__IRISInit, BlueArray__IRISInit
;
;
; Bin Array
;
PUBLIC BinArray__IRISInit
;
; FGCA variables
;
PUBLIC CharArray__IRISInit
;
; Array Addresses
;
PUBLIC SourceArrayAddr__IRISInit, DestArrayAddr__IRISInit
;
; FileName String
;
PUBLIC FGFileName__IRISInit
;
3
;
PUBLIC $BM__IRISInit, $EM__IRISInit ;beginning and end of module
PUBLIC $BD__IRISInit, $BD__IRISInit ;beginning and end of data
;
; The symbol KEY__<dateSYMfile>_OF_<modulename> is needed for
; version checking and can be set to zero
; Do a:
; DIR IRISInit.SYM
; to get the time and date of compilation of the .DEF file
; Assemble with:
; ASMMOD IRISInit
PUBLIC KEY__13apr88_1005_OF_IRISInit
;
KEY__13apr88_1005_OF_IRISInit EQU 0
;
CR = 0DH
;
;----------------------------------------------------------------------
;
; External definitions
;
;----------------------------------------------------------------------
;
EXTRN IS_INITIALIZE:FAR, IS_CONFIGURATION:FAR, IS_RESET:FAR
EXTRN IS_ABORT:FAR, IS_TEST:FAR, IS_END:FAR
EXTRN I$DRIVER_HANDLE:BYTE, I$FLAGS:BYTE, I$ERROR_TABLE_END:WORD
EXTRN I$MAX_BUFFERS_AVAILABLE:BYTE
;
;----------------------------------------------------------------------
;
; Macro definitions
;
;----------------------------------------------------------------------
;
IF1 ;DEFINE ON FIRST PASS ONLY
SetCall MACRO ; set up for an IRIS call
PUSH BP
MOV BP,SP
MOV CS:DStore,DS ;Save the Current DS
MOV AX,SEG I$FLAGS ; get the segment of the IRIS data
MOV DS,AX ; flag data and set up DS
ENDM
;
SetVarCall MACRO
PUSH BP
MOV BP,SP
MOV CS:DStore,DS ;save the Current DS
ENDM
;
Recover MACRO
MOV DS,CS:DStore ;get DS back
MOV SP,BP ; reset stack pointer
POP BP ;restore BP
4
ENDM
;
RecoverVar MACRO
MOV SP,BP
POP BP
ENDM
ENDIF
;
;
;----------------------------------------------------------------------
;
; Implementation Code for Modula 2/86
;
;----------------------------------------------------------------------
;
;
;
IRISInit_TEXT SEGMENT BYTE PUBLIC 'CODE'
ASSUME CS:IRISInit_TEXT
ASSUME DS:NOTHING
;
$BM__IRISInit:
;
ORG 0
;
;----------------------------------------------------------------------
;
;DSeg LABEL WORD
;
;
;
DStore DW ? ;space for DS storage
;
;VParam1 DW ? ;space for VALUE
;VParam2 DW ? ; Params
;RParam1 DD ? ;Space for REFERENCE
;RParam2 DD ? ; long
;RParam3 DD ? ; pointers
;
;
;**********************************************************************
;
; Procedure Code
;
;**********************************************************************
;
;
L__FGInit__IRISInit PROC FAR ;INITIALIZE grabber
;
;
; PROCEDURE FGInit(): CARDINAL;
; (* This procedure initializes the frame grabber *)
;
5
SetCall
CALL IS_INITIALIZE ;CALL IRIS Init
Recover
RET
;
L__FGInit__IRISInit ENDP
;
;
L__FGAbort__IRISInit PROC FAR ;grabber ABORT
;
;
; PROCEDURE FGAbort(): CARDINAL;
; (* This procedure causes an immediate abort of the
; current grabber function *)
;
;
SetCall
CALL IS_ABORT ;CALL IRIS ABORT
Recover
RET
;
L__FGAbort__IRISInit ENDP
;
;
L__FGConfig__IRISInit PROC FAR ;report grabber CONFIG
;
;
; PROCEDURE FGConfig(VAR FGConfiguration: FGConfArray): CARDINAL;
; (* this procedure returns the grabber configuration *)
;
Array = 6
;
SetVarCall
LDS DI,[BP]+Array
PUSH DI
; MOV AX,SEG I$FLAGS
CALL IS_CONFIGURATION ;call the IRIS routine
Recover
RET 04H
;
L__FGConfig__IRISInit ENDP
;
;
L__FGReset__IRISInit PROC FAR ;SEND
;
;
; PROCEDURE FGReset(): CARDINAL;
; (* This procedure resets the frame grabber *)
;
;
SetCall
CALL IS_RESET ;reset the frame grabber
Recover
RET ;
6
;
L__FGReset__IRISInit ENDP
;
;
L__FGEnd__IRISInit PROC FAR ;grabber END
;
;
; PROCEDURE FGEnd(): CARDINAL;
; (* This procedure wipes out all connection to the grabber. It closes
; the channel to the device driver, and deallocates all frame buffers
; and temporary intermediate buffers *)
;
SetCall
CALL IS_END ;END it all
Recover
RET
;
L__FGEnd__IRISInit ENDP
;
;
L__FGTest__IRISInit PROC FAR ;grabber TEST
;
;
; PROCEDURE FGTest(VAR FGMemFailAddr: LONGINT): CARDINAL;
; (* This procedure stops, tests and resets the grabber. The address
; of the first bad byte of menory is returned in FGMemFailAddr *)
;
TAddr = 6
;
SetVarCall
LDS DI,[BP]+TAddr ;get address of variable
PUSH DI ; push offest
CALL IS_TEST ;CALL IRIS Test
Recover
RET 04H
;
L__FGTest__IRISInit ENDP
;
;
$BODY__IRISInit PROC FAR ;module body code
;
RET ;just leave
;
$BODY__IRISInit ENDP
;
;
;
$INIT__IRISInit PROC FAR ;Module Init Code
;
MOV ax,0 ;CLEAR ax
MOV I$FLAGS,AL ;clear I$FLAGS
RET
;
$INIT__IRISInit ENDP
7
;
;
$EM__IRISInit:
;
IRISInit_TEXT ENDS
;
;
IRISInit_DATA SEGMENT WORD PUBLIC 'FAR_BSS'
ASSUME CS:IRISInit_TEXT
;
$BD__IRISInit LABEL FAR
$ED__IRISInit LABEL FAR
IRISInit_DATA ENDS
;
;
; This DATA segment should be merged with the segment of
; the same name in isinit.obj
;
DATA SEGMENT WORD PUBLIC 'DATA'
;
ExternTriggerStatus__IRISInit DW ? ;Define the Cardinals
IVal__IRISInit DW ? ;
RedVal__IRISInit DW ? ;
GreenVal__IRISInit DW ? ;
BlueVal__IRISInit DW ? ;
RowAddr__IRISInit DW ? ;
ColAddr__IRISInit DW ? ;
RowPos__IRISInit DW ? ;
ColumnPos__IRISInit DW ? ;
;
FrameID__IRISInit DW 2 DUP(?) ;Frame ID type
;
FGMemFailAddr__IRISInit DD ? ;Long Integers
RsltSum__IRISInit DD ? ;
;
FGConfiguration__IRISInit DW 20 DUP(?) ;Configuration Array
;
PointArray__IRISInit DW 256 DUP(?) ;Point Arrays
ILUTArray__IRISInit DW 256 DUP(?) ;ILUT Arrays
RedArray__IRISInit DW 256 DUP(?) ;
GreenArray__IRISInit DW 256 DUP(?) ;
BlueArray__IRISInit DW 256 DUP(?) ;
;
BinArray__IRISInit DD 256 DUP(?) ;Bin Arrays
;
CharArray__IRISInit DB 256 DUP(?) ;Char Array
;
SourceArrayAddr__IRISInit DD ? ;holds addresses
DestArrayAddr__IRISInit DD ? ;
;
FGFileName__IRISInit DB 30 DUP(?) ;holds the filename
;
DATA ENDS
8
INIT_FLAG_DATA SEGMENT WORD PUBLIC 'FAR_DATA'
;
$FLAG__IRISInit DB 0
;
INIT_FLAG_DATA ENDS
;
END
DEFINITION MODULE BlockMove;
(*
Title : BlockMove - Move Data to/from memory and frame grabber
LastEdit: 9-May-88 12:26
Author : J. C. Johnston
System : Telescience
Compiler: LOGITECH MODULA-2 V3.03
*)
FROM SYSTEM IMPORT BYTE, ADDRESS;
EXPORT QUALIFIED
BlockGDTType, GBlockAddress, BlockMoveGDT,
MoveMem2FG, MoveFG2Mem, AddArith;
TYPE
BlockGDTType = ARRAY[0..47] OF BYTE;
VAR
GBlockAddress : ADDRESS;
BlockMoveGDT : BlockGDTType;
PROCEDURE MoveMem2FG(Source, Destination: ADDRESS; Length: CARDINAL);
(* This procedure set up and executes a block move from
system memory to the Frame Grabber memory *)
PROCEDURE MoveFG2Mem(Source, Destination: ADDRESS; Length: CARDINAL);
(* This procedure set up and executes a block move from the Frame
Grabber memory to system memory *)
PROCEDURE AddArith(VAR AddressArg: ADDRESS; Increment: CARDINAL);
(* This procedure adds the increment to AddressArg and returns the
new Address in AddredssArg. Use this procedure to do arithmetic
on ADDRESS type variables to handle overflow of the OFFSET into
the SEGMENT *)
END BlockMove.
Figure 7a. Definition module for an assembly language module
-------------------------------------
; Figure 7b - Assembly code for the BlockMove module 7b-1
;
PAGE ,132
.LALL
.286
;******************************************************************
; Module : BlockMove, move a block between DOS memory
; and Frame Grabber Memory
;
TITLE BlockMove
PUBLIC L__MoveMem2FG__BlockMove
PUBLIC L__MoveFG2Mem__BlockMove
PUBLIC L__AddArith__BlockMove
;
; Set the KEY symbol to the compilation date for the def module.
; the compilation date can be obtained by executing the command:
; DIR BlockMove.sym
;
PUBLIC KEY__23may88_1724_OF_BlockMove
KEY__23may88_1724_OF_BlockMove EQU 0
PUBLIC $INIT__BlockMove
PUBLIC $BM__BlockMove, $EM__BlockMove
PUBLIC $BD__BlockMove, $ED__BlockMove
BlockMove_TEXT SEGMENT BYTE PUBLIC 'CODE'
ASSUME CS:BlockMove_TEXT
ASSUME DS:NOTHING
$BM__BlockMove:
;-----------------------------------------------------------
L__MoveMem2FG__BlockMove PROC FAR
;-----------------------------------------------------------
;
;PROCEDURE MoveMem2FG(Source, Destination: ADDRESS; Length: CARDINAL);
; (* This procedure set up and executes a block move from
; system memory to the Frame Grabber memory *)
;
MLength = 6
destination = MLength + 2
source = destination + 4
;
PUSH BP
MOV BP,SP
PUSH DS
PUSH AX
PUSH BX
PUSH CX
PUSH DX
MOV AX, SEG BlockMove_DATA
MOV DS,AX
;
; Figure 7b - Assembly code for the BlockMove module 7b-2
CALL S_SetFGRW__BlockMove ; set the frame grabber to R/W
;
LES CX,[BP]+source
MOV AX,ES ;get ES into AX
SHL AX,4 ;shift 4 bits
MOV BX,ES ;Move ES into BX
SHR BX,12 ;shift high part
ADD AX,CX ;add offset and shifted source
ADC BX,0 ;add BX with carry
MOV SAddressL,AX ;store the low source address
MOV SAddressH,BL ;store the high source address
;
LES CX,[BP]+destination
MOV AX,ES ;get ES into AX
SHL AX,4 ;shift 4 bits
MOV BX,ES ;Move ES into BX
SHR BX,12 ;shift high part
ADD AX,CX ;add offset and shifted destination
ADC BX,00A0H ;add BX and offset with carry
MOV DAddressL,AX ;store the low destination address
MOV DAddressH,BL ;store the high destination address
;
MOV AX,[BP]+MLength ;get the length to move
MOV SLength,AX ;store it in the GDT
MOV DLength,AX ;store it in the GDT
;
MOV CX,AX ;load the length into CX
SHR CX,1 ; get the number of words
MOV AX,GBlockAdrSeg ;get the segment of the GDT
MOV ES,AX ; into ES
MOV SI,GBlockAddress__BlockMove
MOV AH,87H ;get the command
INT 15H ;do the call
;
CALL S__ResetFG__BlockMove ;Reset the Frame Grabber planes
POP DX
POP CX
POP BX
POP AX
POP DS
MOV SP,BP
POP BP
RET 0AH
L__MoveMem2FG__BlockMove ENDP
;-----------------------------------------------------------
L__MoveFG2Mem__BlockMove PROC FAR
;-----------------------------------------------------------
;
;PROCEDURE MoveFG2Mem(Source, Destination: ADDRESS; Length: CARDINAL);
; (* This procedure set up and executes a block move from
; system memory to the Frame Grabber memory *)
;
; Figure 7b - Assembly code for the BlockMove module 7b-3
MLength = 6
destination = MLength + 2
source = destination + 4
;
PUSH BP
MOV BP,SP
PUSH DS
PUSH AX
PUSH BX
PUSH CX
PUSH DX
MOV AX, SEG BlockMove_DATA
MOV DS,AX
;
CALL S_SetFGRW__BlockMove ; set the frame grabber to R/W
;
LES CX,[BP]+source
MOV AX,ES ;get ES into AX
SHL AX,4 ;shift 4 bits
MOV BX,ES ;Move ES into BX
SHR BX,12 ;shift high part
ADD AX,CX ;add offset and shifted source
; ADC BX,00A4H ;add BX with carry
ADC BX,00A0H ;add BX with carry
MOV SAddressL,AX ;store the low source address
MOV SAddressH,BL ;store the high source address
;
LES CX,[BP]+destination
MOV AX,ES ;get ES into AX
SHL AX,4 ;shift 4 bits
MOV BX,ES ;Move ES into BX
SHR BX,12 ;shift high part
ADD AX,CX ;add offset and shifted destination
ADC BX,0 ;add BX and offset with carry
MOV DAddressL,AX ;store the low destination address
MOV DAddressH,BL ;store the high destination address
;
MOV AX,[BP]+MLength ;get the length to move
; SHR CX,1 ; get the number of words
MOV SLength,AX ;store it in the GDT
MOV DLength,AX ;store it in the GDT
;
MOV CX,[BP]+MLength ;load the length
SHR CX,1 ; get the number of words
MOV AX,GBlockAdrSeg ;get the segment of the GDT
MOV ES,AX ; into ES
MOV SI,GBlockAddress__BlockMove
MOV AH,87H ;get the command
INT 15H ;do the call
;
CALL S__ResetFG__BlockMove ;Reset the Frame Grabber planes
POP DX
POP CX
POP BX
; Figure 7b - Assembly code for the BlockMove module 7b-4
POP AX
POP DS
MOV SP,BP
POP BP
RET 0AH
L__MoveFG2Mem__BlockMove ENDP
;
;-----------------------------------------------------------
L__AddArith__BlockMove PROC FAR
;-----------------------------------------------------------
;
;PROCEDURE AddArith(VAR AddressArg: ADDRESS; Increment: CARDINAL);
; (* This procedure adds the increment to AddressArg and returns the
; new Address in AddredssArg. Use this procedure to do arithmetic
; on ADDRESS type variables to handle overflow of the OFFSET into
; the SEGMENT *)
;
Increment = 6
AddressArg = MLength + 2
;
PUSH BP
MOV BP,SP
PUSH AX
PUSH BX
PUSH CX
PUSH DX
;
LES BX,[BP]+AddressArg ;get the address of the parameter
LES BX,ES:[BX] ;get the parameter itself
MOV AX,ES ;get SEG into AX
SHL AX,4 ;shift SEG 4 bits left
MOV CX,ES ;Move SEG into BX
SHR CX,12 ;isolate the high nybble
ADD AX,BX ;add OFFSET (in BX) and Lshifted SEG
ADC CX,0 ;add Rshifted SEG and offset with carry
MOV BX,[BP]+Increment ;get the increment
ADD AX,BX ;Add it into the offset
ADC CX,0 ; Add the carry to the segment
;
SHL CX,12 ;shift it way over to make a SEG
;
LES BX,[BP]+AddressArg ;get the address of the parameter
MOV ES:[BX],AX ;put away the offset
MOV ES:[BX]+2,CX ;store the offset
;
POP DX
POP CX
POP BX
POP AX
MOV SP,BP
POP BP
RET 06H
; Figure 7b - Assembly code for the BlockMove module 7b-5
L__AddArith__BlockMove ENDP
;
;
INSCR1 = 230H ; Video Input Ctrl/Stat Reg 1
INSCR2 = 232H ; Video Input Control
Mask1 = 0080H ; mask the busy bit
Mask2 = 0FFF0H ; reset write protect bits
;
;
S_SetFGRW__BlockMove PROC NEAR ; set the frame grabber to R/W
;
;
CALL S__WaitBusy__BlockMove ; wait for the Busy Bit
MOV DX,INSCR2 ;get the address of Vid In Ctrl Port
IN AX,DX ;Read the Byte
MOV PortStore,AX ;Save it
AND AX,Mask2 ;clear the protection bits
OUT DX,AX ;and set the FG
RET
S_SetFGRW__BlockMove ENDP
;
;
;
S__ResetFG__BlockMove PROC NEAR ; reset the frame grabber R/W mode
;
;
CALL S__WaitBusy__BlockMove ; wait for the Busy Bit
MOV DX,INSCR2 ;get the address of Vid In Ctrl Port
MOV AX,PortStore ;get the stored port value
OUT DX,AX ;and set the FG
RET
S__ResetFG__BlockMove ENDP
;
;
;
S__WaitBusy__BlockMove PROC NEAR ; reset the frame grabber R/W mode
;
;
MOV DX,INSCR1 ;get the address of Vid Ctrl Port
BLoop: IN AX,DX ;read the control port
TEST AX,Mask1 ;Check for Busy
JNZ BLoop ;loop till not busy
RET
S__WaitBusy__BlockMove ENDP
;
;
$INIT__BlockMove PROC FAR
;
; Load the address of the BlockMoveGDT into GBlockAddress
;
MOV CX,SEG BlockMove_DATA ;GET SEGMENT OF DATA
MOV DS,CX ;MOVE IT TO DS
MOV ES,CX ;and ES
MOV BX,OFFSET BlockMoveGDT__BlockMove ;GET OFFSET OF DATA
; Figure 7b - Assembly code for the BlockMove module 7b-6
MOV ES:GBlockAddress__BlockMove, BX ;STORE THE OFFSET
MOV ES:GBlockAdrSeg, DS ;STORE THE SEGMENT
;
; Clear the GDT
;
MOV AX,SEG BlockMoveGDT__BlockMove ;get segment of table
MOV BX,OFFSET BlockMoveGDT__BlockMove ;get offset of table
MOV DS,AX ;load DS
MOV CX,2FH ;SET UP FOR 48 loops
MOV AL,0 ; set to 0
Init1: MOV [BX],AL ;clear the GDT
INC BX ;move the offset
LOOP Init1 ;Loop until done
;
; Preset the access rights bytes to 93H
;
MOV AL, 93H ;setup access rights
MOV SAccessRights, AL ;set the byte
MOV DAccessRights, AL ;set the byte
RET
;
$INIT__BlockMove ENDP
$EM__BlockMove:
BlockMove_TEXT ENDS
BlockMove_DATA SEGMENT WORD PUBLIC 'FAR_BSS'
ASSUME CS : BlockMove_TEXT
$BD__BlockMove LABEL FAR
;
PortStore DW ? ;temporary storage for port
;
GBlockAddress__BlockMove DW ? ;holds an address
GBlockAdrSeg DW ?
;
; Dummy Descriptor
;
BlockMoveGDT__BlockMove DW ? ;DUMMY TABLE
DW ? ;
DB ? ;
DB ? ;
DW ? ;RESERVED
;
; Descriptor for GDT
;
DW ? ;GDT Descriptor TABLE
DW ? ;
DB ? ;
DB ? ;
DW ? ;RESERVED
;
; Source Descriptor Table
;
SLength DW ? ;source length
; Figure 7b - Assembly code for the BlockMove module 7b-7
SAddressL DW ? ;bits 0-15 of source address
SAddressH DB ? ;bits 16-23 of source address
SAccessRights DB ? ;
DW ? ;RESERVED
;
; Destination Descriptor Table
;
DLength DW ? ;destination length
DAddressL DW ? ;bits 0-15 of destination address
DAddressH DB ? ;bits 16-23 of Destination address
DAccessRights DB ? ;
DW ? ;RESERVED
;
; BIOS CS Descriptor
;
DW ? ;table filled by BIOS
DW ? ;
DB ? ;
DB ? ;
DW ? ;RESERVED
;
; stack segment descriptor
;
DW ? ;Table filled by BIOS
DW ? ;
DB ? ;
DB ? ;
DW ? ;RESERVED
;
$ED__BlockMove LABEL FAR
BlockMove_DATA ENDS
END
Figure 7b. Assembly code for the module
