IBM 5170 Technical Reference page 227

0000
TITLE GOT_BlD - 09/26/83 BU I lD THE GOT
• liST
I NClUOE SEGMENT. SRC
0000
CODE SEGMENT BYTE PUBLIC
.~
~
~
ASSUME CS:CODE
ASSUME SS: NOTH I NG
ASSUME OS: CODE
ASSUME ES: NOTH I NG
PUBl I C GOT_BlD
PAGE
THE FOllOWING DATA DEFINES THE PRE-INITIALIZED GOT.
THESE MUST BE INITIALIZED IN THE ORDER IN WHICH THEY APPEAR
IN THE GDT_DEF STRUCTURE DEFINITION AS IT IS IN SYSDATA.INC.
FI RST ENTRY UNUSABLE
OESCR_OEF SEG, 0, 0, 0, 0
0000 0000
OW 0
Segment lim i t
0002
0000
OW 0
Segment base address - low word
0004 00
DB 0
Segment base address - high byte
0005 00
DB 0 Access rights byte
0006 0000
OW 0 Reserved
THE GOT ITSELF
OESCR_OEF SEG, GOT_lEN, GDT_lOC, 0, CPlO_DATA_ACCESS
0008 0088
OW GOT lEN ; Segment lim
i
t
OOOA
08AO
OW CDT-lOC ; Segment base address - low word
OOOC 00
DB 0 - ; Segment base address - high byte
0000 93
DB CPlO_DATA_ACCESS ; Access rights byte
OOOE
0000
OW 0 ; Reserved
PAGE
THE SYSTEM lOT DESCR I PTOR
DESCR_DEF SEC, SYS_IDT_lEN, SYS_'DT_LOC, 0, CPLO_DATA_ACCESS
DOlO 0800
OW SYS lOT lEN ; Segment lim i t
0012
OOAO
g~
gys:
I DT:lOC ;
Segm9n~ ~:~~e~~d ~::~ ~d~ r~~\;t~
ow wo rd
0014 00
0015
93 ge
gPlO_DATA_ACCE~SReS9rved
; Access rights byte
0016 0000
THE SYSTEM DATA AREA DESCR I PTOR
DESCR_DEF SEG, SOA_lEN, SOA_lOC, 0, CPlO_DATA_ACCESS
0018 0300
OW SDA lEN ; Segment lim i t
001 A 0400
001C 00
g~ ~DA:lOC
;
~:~~:~~
g:::
:~~~:::
:
~~~hwg;~9
DOlO 93
DB CPlO_OATA_ACCESS ; Access rights byte
DOlE 0000
OW 0 ; Reserved
PAGE
COM PAT I BlE MONOCHROME CRT
g~SCR_DE~CRT SIZ~EC,
MCRT_SIZE;
~~~~:n~Oi ,=?~T@_H',
CPLO_DATA_ACCESS
0020 1000
0022 0000
OW MCRT@ lO ; Segment base address - low word
0024 DB
0025 93
g:
~~~6~~~iA_ACCESS
; segmen;
~~6:s:d~~:~is" b~~~h
byte
0026 0000
OW 0 ; Reserved
COM PAT I BlE COLOR CRT
DESCR_DEF SEC, CCRT_SIZE, CCRT@_LO, CCRT@_HI, CPlO_OATA_ACCESS
0028 4000
OW CCRT SIZE
; Segment lim i t
002A 8000
Segment base address - low word
002C DB
g~ gg~i:-~~ ~
Segment base address .. high byte
0020 93
DB CPlO_DATA_ACCESS ; Access rights byte
002E 0000 OW
° ;
Reserved
ENHANCED COLOR CRT - ONE ENTRY FOR EACH 64K
DESCR_DEF SEC, ECCRT_S IlE, ECCRT@_lO_lO, ECCRHClO_H I, CPlO_DATA_ACCESS
0030
FFFF
OW ECCRT SIZE ; Segment
J
Imit
0032 0000
0034
OA
g~ ~gg~i:=tg=~~
;
~:~~:~~ ~::: :~~~:::
:
~~;hwg;~e
0035 93
DB CPLO_DATA_ACCESS ; Access rights byte
0036 0000 OW
° ;
Rese rved
SECOND PART OF CRT
DESCR_OEF SEC, ECCRT_S IlE, ECCRT@_HI_lO, ECCRTO_H I_H I, CPlO_OATA_ACCESS
0038 FFFF
OW ECCRT SIZE ; Segment limit
003A 0000
OW ECCRT@_HI_lO ; Segment base address - low word
003C
DC
DB ECCRT@_HI_HI ; Segment base address" high byte
0030 93
DB CPlO_DATA_ACCESS ; Access rights byte
003E
0000 OW
° ;
Reserved
PAGE
CODE SEGMENT FOR POST CODE, SYSTEM lOT
DESCR_OEF SEG, MAX_SEG_lEN, CSEG@_lO, CSEG@_HI, CPlO_CODE_ACCESS
0040
FFFF
OW MAX_SEC_lEN ; Segment lim I t
0042 0000
OW CSEG@ lO ; Segment base address - low word
0044 OF
DB CSEOO=HI ; Segment base address .. high byte
0045
9B
DB CPlO_CODE_ACCESS ; Access rights byte
0046 0000
OW
° ;
Reserved
TEMPORARY OESCR I PTORS FOR ES, CS, 55, AND OS
DESCR_OEF SEG, MAX_SEC_lEN, NSEG@_lO, NSEGO_H I, CPLO_OATA_ACCESS
0048 FFFF
OW MAX SEG LEN ; Segment lim i t
004A 0000
OW NSEG® LO ; Segment base address" low word
004C
00
DB NSEC@-HI ; Segment base address" high byte
0040 93
DB CPlO_DATA_ACCESS ; Access rights byte
004E 0000 OW
° ;
Reserved
DESCR_DEF SEC, MA>CSEC_lEN, NSEC@_lO, NSEG@_HI, CPlO_DATA_ACCESS
0050
FFFF
OW MAX_SEC_lEN ; Segment lim i t
0052
0000
OW NSEOO lO ; Segment base address - low word
0054 00
DB NSEC@-HI ; Segment base address .. high byte
0055 93
DB CPLO_DATA_ACCESS ; Access rightS byte
0056 0000
OW
° ;
Reserved
5-85