IBM AT 5170 Technical Reference page 262

IBM Personal Computer MACRO Assembler Version 2.00 1-3
TEST5 ---- 06/10/85 EXCEPT ION INTERRUPT TEST HANDLERS 06-10-85
22. OIIC 88 o8AO
MOV AX ,GOT_LOC
AX
=
LOW WORD OF GOT ADDRESS
230 OIIF AB STQSW PUT THAT IN BASE FIELD - LOW
231 0120 B8 0000 MOV
AX,O
AX
=
HIGH BYTE OF ADDRESS, AND
232 0123 AB STOSW ACCESS RIGHTS BYTE IS UNDEF I NED
233 SEGOV ES
LOAD THE GOTR
23'
012-4 26 DB 026H
235 LGOT
[BP]
FROM TH IS AREA
23. 0125 OF DB
OOFH
237 0126
n0004 LABEL BYTE
238
0126 88 56 00
MOV QX,WORo PTR [8P)
23'
0129 710005 LABEL BYTE
2.0 0126
ORe OFFSET CSt 770004
2"
0126 01 DB OOIH
2.2 0129
ORe OFFSET CS:??0005
2'.
2.3
0129 88 Fo
MOV ol,BP ; RESTORE THE ES:DI POINTER
2 ••
o
12B AB STOSW
2'5
012C AB STOSW
0120 88 Fo
MOV OI,SP
2'7
2"
SWITCH TO VIRTUAL MODE
2 ••
250 012F 50 POP
BP
RESTORE BP
251 0130 BS 0001 MOV AX, V I RTUAL ENA8LE MACHINE STATUS WORD NEEDED TO
252 LMSW
AX -
SWITCH TO VIRTUAL MODE
0133 OF 01 FO DB
OOFH, 00
I H. OFOH
"3
25'
255
0136 EA 08 OEAH .JUMP FAR TO PURGE PRE-FETCH QUEUE
25.
0137 013B R OW OFFSET ~ONE TO OFFSET
257
0139 00-40
ow
SYS_ROM_CS IN SEGMENT
258 0138 DONE:
25'
0138 BO 85 MOV
AL ,85H
<><><><><><> <> <><><><><>
2.0 0130 E6 80 OUT MFG_PORT ,AL
<><>
CHECK PO I NT 82
<> <>
2.,
013F C3
RET
SYSTEM INITIALIZATION
2.2
2.3 0140 SYSINITI ENDP
2.'
2.5
2 •• 0140 GOT SLo PROC NEAR
2.7 0140 BE OlAF R
- MOV
SI,OFFSET GOT DATA START ; OS:SI --> GOT
2 ••
0143 B9 0044
MOV
CX, (OFFSET GOT DATA END-OFFSET GOT DATA STARn /2 ; WORD COUNT
2.'
0146 F3/ AS REP
MOVSW - - -; COpy GOT I NTO MEMORY
270
0148 C3 RET
271 0149
GoT_BL.D ENDP
272
273
27'
0149 PROC NEAR
275
27.
;----- BUILD THE lOT. THE lOT WILL CONTAIN VECTORS FOR EXCEPTION HANDLERS
277
278
0149 BE 0237 R MOV
!~ :g~FSET
SYS_IDT_OFFSET; ;
~~~~R~G~i
I
E~~~~TP~~NTS
280 0,4E BE 08
MOV DS.AX
281 0150 BF oOAO
MOV
DI,SYS lOT LOC
282 0153 2B CO SUB
AX,AX - ­
283 0155 8E CO
MOV
ES,AX WHERE THE lOT WILL BE.
27. 014C 8C CB
MOV
2.,
015T BB 0040
MOV
CS IS n£ SAME FOR ALL INTERRUPTS
2.5
015A B& 81
MOV
~~:i~!pRg~T~S
ACCESS RIGHTS BYTE FOR THE GATE
2 ••
OISC B2 00 MOV
OL,O -
THE WORD COUNT FIELD I S UNUSED
287 OISE B9 0020
MOV
CX,32 THERE ARE 32 RESERVED INTERRUPTS
28e
0161
LOW_lOT:
THIS LOOP BUILDS 32 DESCRIPTORS IN THE
28.
lOT FOR THE RESERVED INTERRUPTS
2'0
0161 A5 MOVSW GET A ROUTINE ENTRY POINT
2"
AND PUT IT IN THE OFFSET FIELD
2'2
0162 8B C3
MOV AX,8X
GET THE SYSTEM CODE SEGMENT SELECTOR
2.3 0164 AB STOSW AND PUT I TIN THE SELECTOR FIELD
2"
0165 88 C2
MOV AX.DX
GET THE I NTERRLlPT GATE BYTE
2.5 0'67 A8 STOSW
Alii) PUT IN THE ACCESS RIGHTS FIELD
2"
0168 B8 0000 MOV AX,O zERO OUT
2.7
016B AB STOSW THE RESERVED POS 1 T IONS
2"
o 16C E2 F3 LOOP
LOW lOT
AND REPEAT AS 01 REeTED
2"
016E B9 OOEO
MOV CX,256-32
256 TOTAL - 32 DOt-E ::: WHATEVER I S LEFT
300 0111 80 0217 R MOV 8P,OFFSET FREE INTS
THERE IS A COPY OF AN UN-INITIALIZED
301 INTERRUPT OESCR 1 PTOR AT FREE_' NTS
302 0174 HIGH_lOT:
303 0174 88 F5 MOV SI,BP OS:SI
-->
FREE DESCRIPTOR
30'
(ES:OI LEFT OFF AT INT 32)
305 0176 A5 MOVSW MOVE OFFSET OF THE I RET I NSTRUCT I ON
300 0111 A5 MQVSW MOVE THE CS SELECTOR
307 0118 A5 MOVSW MOVE THE ACCESS RIGHTS BYTE
30e
01 T9 A8
STOSW
ZERO OUT THE RESERVED WORD
30'
OllA E2 F8
LOOP HIGH_lOT
FILL THE REMA I NOER OF THE TABLE
310
311
INITIALIZE THE ENTRY POINTS FOR POST TEST
312
313 017C 26 C7 06 olAO 0098 R MOV
31. 018326 C7 0& DIA8 009C R
MOV
315 018A 26 Cl 06 0180 OOAO R MOV
31. 0191 26 Cl 060188 00A4 R
MOV
317 0198 26 C'1 06 OICO OOA8 R MOV
318
019F 26 C7 06 DIC8 OOAC R
MOV
31. 0lA6 26 C7 06 DIDO OOBO R MOV
320 OIAo C3
RET
321
322 OIAE [RET ADDR LABEL WORD : FOR UN- I NIT I AL I ZED INTERRUPTS
323 OIAE CF
- IRET
; NULL RETURN
S-90
TESTS