AT&T 3B2/300 Technical Reference Manual page 577

- - - - - - - - - - - - - - - - - - - - - - - Appendix: VIRTUAL ADDRESS SPACE
SECTION 1 KERNEL VIRTUAL ADDRESS SPACE
SEGMENT VIRTUAL SEGMENT SECTION SEGMENT
SEGMENT
LOADER
NUMBER ADDRESS SIZE
NAME CONTENTS ACCESS OPTION
Ox 0-0x 7 Ox 44000000 1 MB .text KERNEL TEXT KR
Ox 8-0x F Ox 44100000 1 MB .data KERNEL DATA KRW
Ox 10-0x lF Ox 44200000 2 MB .bss KERNEL STATIC DATA KRW
Ox 20-0x 2F Ox 44400000 2 MB KV_resmm KERNEL SCRATCH KRW NOLOAD
Ox 30-0x 3F Ox 44600000 2 MB KV_sysseg NETWORK INTERFACE SCRATCH KRW NOLOAD
Ox 40 Ox 44800000
128 KB KV_prfdat PAGE FRAME DATA KRW
NOLOAD
Ox 41 Ox 44820000
128 KB KV_tables SYSTEM TABLES KRW
NOLOAD
LEGEND:
KB KILOBYTE
KR KERNEL READ
KRW KERNEL READ /WRITE
MB MEGABYTE
Figure A-3: Virtual Address Space - Section 1
SECTION
2
USER VIRTUAL ADDRESS SPACE
VIRTUAL
SEGMENT SECTION SEGMENT
SEGMENT LOADER
ADDRESS SIZE
NAME CONTENTS
ACCESS OPTION
Ox AOOOOOOO 1 MB .text USER TEXT
KR/UR
Ox AOOOOOOO
+
n*20000 1 MB .data USER DATA KRW/URW
LEGEND:
KR KERNEL READ
KRW KERNEL READ /WRITE
UR USER READ
URW USER READ/WRITE
Figure A-4: Virtual Address Space - Section 2
VIRTUAL ADDRESS SPACE A-3