cpu —
HP PA-RISC CPU
cpu* at mainbus0 irq 31
The following table lists the PA-RISC CPU types and their characteristics, such
as TLB, maximum cache sizes (where the ‘*’ character means
on-chip) and HP 9000/700 machines they were used in (see also
intro(4) for the reverse list).
| CPU |
PA |
Clock |
Caches |
TLB |
BAT |
Models |
|
|
MHz max |
KB max |
|
|
|
| 7000 |
1.1a |
66 |
256 L1I |
96I |
4I |
705, 710, 720 |
|
|
|
256 L1D |
96D |
4D |
730, 750 |
| 7100 |
1.1b |
100 |
1024 L1I |
120 |
16 |
715/33/50/75 |
|
|
|
2048 L1D |
|
|
725/50/75 |
|
|
|
|
|
|
{735,755}/100 |
|
|
|
|
|
|
742i, 745i, 747i |
| 7150 |
1.1b |
125 |
1024 L1I |
120 |
16 |
735/125, 755/125 |
|
|
|
2048 L1D |
|
|
|
| 7100LC |
1.1c |
100 |
1 L1I* |
64 |
8 |
712/60/80/100 |
|
|
|
1024 L2I |
|
|
715/64/80/100 |
|
|
|
1024 L2D |
|
|
715/100XC |
|
|
|
|
|
|
725/64/100 |
|
|
|
|
|
|
743i, 748i |
|
|
|
|
|
|
SAIC |
| 7200 |
1.1d |
140 |
2 L1* |
120 |
16 |
C100, C110 |
|
|
|
1024 L2I |
|
|
J200, J210 |
|
|
|
1024 L2D |
|
|
|
| 7300LC |
1.1e |
180 |
64 L1I* |
96 |
8 |
A180, A180C |
|
|
|
64 L1D* |
|
|
B132, B160, B180 |
|
|
|
8192 L2 |
|
|
C132L, C160L |
|
|
|
|
|
|
744, 745, 748 |
|
|
|
|
|
|
RDI PrecisionBook |
| 8000 |
2.0 |
180 |
1024 L1I |
96 |
|
C160, C180 |
|
|
|
1024 L1D |
|
|
J280, J282 |
| 8200 |
2.0 |
300 |
2048 L1I |
120 |
|
C200, C240 |
|
|
|
2048 L1D |
|
|
J2240 |
| 8500 |
2.0 |
440 |
512 L1I* |
160 |
|
A400, A500, C360 |
|
|
|
1024 L1D* |
|
|
B1000, B2000, C3000 |
|
|
|
|
|
|
J5000, J7000 |
| 8600 |
2.0 |
550 |
512 L1I* |
160 |
|
A400, A500, C3600 |
|
|
|
1024 L1D* |
|
|
B2000, B2600 |
|
|
|
|
|
|
J5600, J6000, J7600 |
| 8700 |
2.0 |
875 |
768 L1I* |
240 |
|
A400, A500, J6700 |
|
|
|
1536 L1D* |
|
|
C3650, C3700, C3750 |
The following table summarizes available floating-point coprocessor models for
the 32-bit PA-RISC processors.
| FPU |
Model |
| Indigo |
|
| Sterling I MIU (TYCO) |
|
| Sterling I MIU (ROC w/Weitek) |
|
| FPC (w/Weitek) |
|
| FPC (w/Bit) |
|
| Timex-II |
|
| Rolex |
725/50, 745i |
| HARP-I |
|
| Tornado |
J2x0,C1x0 |
| PA-50 (Hitachi) |
|
| PCXL |
712/60/80/100 |
The following table summarizes the superscalar execution capabilities of 32-bit
PA-RISC processors.
| CPU |
Units |
Bundles |
| 7100 |
1 integer ALU |
load-store/fp |
|
1 FP |
int/fp |
|
|
branch/* |
| 7100LC |
2 integer ALU |
load-store/int |
|
1 FP |
load-store/fp |
|
|
int/fp |
|
|
branch/* |
| 7200 |
2 integer ALU |
load-store/int |
|
1 FP |
load-store/fp |
|
|
int/int |
|
|
int/fp |
|
|
branch/* |
| 7300LC |
2 integer ALU |
load-store/int |
|
1 FP |
load-store/fp |
|
|
int/fp |
|
|
branch/* |
| 8x00 |
2 integer ALU |
4-way superscalar |
|
2 shift/merge |
|
|
2 load/store |
|
|
2 FPU mul/add |
|
|
2 FPU div/sqrt |
|
In conclusion, all of the above CPUs are dual-issue, or 2-way superscalar, with
the exception that on CPUs with two integer ALUs only one of these units is
capable of doing shift, load/store and test operations. Additionally, there
are several kinds of restrictions placed upon the superscalar execution:
For the purpose of showing which instructions are allowed to proceed together
through the pipeline, they are divided into classes:
| Class |
Description |
| flop |
floating point operation |
| ldst |
loads and stores |
| flex |
integer ALU |
| mm |
shifts, extracts and deposits |
| nul |
might nullify successor |
| bv |
BV, BE |
| br |
other branches |
| fsys |
FTEST and FP status/exception |
| sys |
system control instructions |
For CPUs with two integer ALUs (7100LC, 7200, 7300LC), the following table lists
the instructions which are allowed to be executed concurrently:
| First |
Second instruction |
| flop |
+ ldst/flex/mm/nul/bv/br |
| ldst |
+ flop/flex/mm/nul/br |
| flex |
+ flop/ldst/flex/mm/nul/br/fsys |
| mm |
+ flop/ldst/flex/fsys |
| nul |
+ flop |
| sys |
never bundled |
ldst + ldst is also possible under certain circumstances, which is then called
"double word load/store".
The following restrictions are placed upon the superscalar execution:
- An instruction that modifies a register will not be bundled with another
instruction that takes this register as operand. Exception: a flop can be
bundled with an FP store of the flop's result register.
- An FP load to one word of a doubleword register will not be bundled with a
flop that uses the other doubleword of this register.
- A flop will not be bundled with an FP load if both instructions have the
same target register.
- An instruction that could set the carry/borrow bits will not be bundled
with an instruction that uses carry/borrow bits.
- An instruction which is in the delay slot of a branch is never bundled
with other instructions.
- An instruction which is at an odd word address and executed as a target of
a taken branch is never bundled.
- An instruction which might nullify its successor is never bundled with
this successor. Only if the successor is a flop instruction is this bundle
allowed.
The performance monitor coprocessor is an optional, implementation-dependent
coprocessor which provides a minimal common software interface to
implementation-dependent performance monitor hardware.
The debug special function unit is an optional, architected SFU which provides
hardware assistance for software debugging using breakpoints. The debug SFU is
currently defined only for Level 0 processors.
asp(4),
intro(4),
lasi(4),
mem(4),
pdc(4),
wax(4)
Hewlett-Packard,
PA-RISC 1.1 Architecture and Instruction Set Reference
Manual, May 15, 1996.
Hewlett-Packard,
PA7100LC ERS, Public version
1.0, March 30 1999.
Hewlett-Packard Journal,
Design of the PA7200 CPU, February
1996.
Hewlett-Packard,
PA7300LC ERS, Version 1.0,
March 18 1996.
The
cpu driver was written by
Michael Shalayeff
<
mickey@openbsd.org>
for the HPPA port for
OpenBSD 2.5.
![[OpenBSD]](/openbsd.gif){kind=small}