Vax 613 0S Instruction Manual Page 260

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The components of the general portion of the HWRPB are:
Component Address Length Description
HWRPB
physical address
HWRPB 8 bytes The starting physical address of the
HWRPB.
HWRPB in
ASCII
HWRPB +
8
16
8 bytes Contains the ASCII string
<HWRPB><0><0><0>. This field is used
when validating an existing HWRPB.
HWRPB
revision
HWRPB +
10
16
8 bytes HWRPB version, which allows tracking of
future changes to the HWRPB.
HWRPB size HWRPB +
18
16
8 bytes Size of HWRPB in bytes.
Primary CPU
ID
HWRPB +
20
16
8 bytes The value of the WHAMI (who-am-i
register) IPR to tell what processor is
the primary processor. This field always
contains 0 on the DEC 3000 AXP.
Page size HWRPB +
28
16
8 bytes The number of bytes in a page for this
implementation. This field always
contains 2000
16
(8192 decimal) on the
DEC 3000 AXP to denote an 8 Kb page
size.
Physical
address size
HWRPB +
30
16
8 bytes The size of the physical address space
for this processor implementation. This
field contains 22
16
(34 decimal) on the
DEC 3000 AXP to denote a 34 bit physical
address space.
Maximum valid
ASN
HWRPB +
38
16
8 bytes The maximum ASN value allowed by this
implementation. This field contains 10
16
(16 decimal).
System serial
number
HWRPB +
40
16
16 bytes This system’s serial number, a 10-
character ASCII string.
System type HWRPB +
50
16
8 bytes Identifies the family or platform of the
system. This field contains 4 to denote
400/500/600/700/800/900 models and 7 to
denote a 300 model.
System
variation
HWRPB +
58
16
8 bytes Identifies the subtype variation of the
system.
System revision
code
HWRPB +
60
16
8 bytes The four ASCII characters of the system’s
revision field. The console intializes it
to 0. System or application software
can overwrite this field with the correct
revision code.
Interval clock
interrupt
frequency
HWRPB +
68
16
8 bytes The number of interrupt clock interrupts
per second that can occur in this system
scaled by 4096(
10
).
Cycle counter
frequency
HWRPB +
70
16
8 bytes The number of times the SCC and PCC
get updated per second in this system.
VPTB_value HWRPB +
78
16
8 bytes Virtual page table base.
Reserved for
architecture use
HWRPB +
80
16
24 bytes
TBhint_offset HWRPB +
88
16
8 bytes Offset to TBhint block.
16–36 Console
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