Privileged Mode
Modifies the NM processor status word (PSW).
Exercise a bit of care with this command.
Syntax |
 |
Parameters |
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- bit_string
A string of characters that indicates which bits in the PSW are to be
modified. The letters listed below represent individual fields: lower
case implies turn the bit off, and uppercase implies turn the bit on.
All unreferenced bits remain unchanged. All named bits with the
exception of the "C/B" bits may be altered with this command.
The IPSW has the following format:
1 1 1 1 1 1 1 2 2 2 2 3 3
0 7 8 9 0 1 2 3 4 5 6 4 7 8 9 0 1
-----------------------------------------------------------------
|J| |T|H|L|N|X|B|C|V|M| C/B | |R|Q|P|D|I|
-----------------------------------------------------------------
|
- J
Joint instruction and data TLB misses/page faults pending
- T
Taken branch trap enabled
- H
Higher-privilege transfer trap enable
- L
Lower-privilege transfer trap enable
- N
Instruction whose address is at front of PC queue is nullified
- X
Data memory break disable
- B
Taken branch in previous cycle
- C
Code address translation enable
- V
Divide step correction
- M
High-priority machine check disable
- C/B
Carry/Borrow bits
- R
Recovery counter enable
- Q
Interruption state collection enable
- P
Protection ID validation enable
- D
Data address translation enable
- I
External, power failure, & low-priority machine check interruption enable
System Debug displays this register in two formats:
IPSW=$6ff0b=jthlnxbCVmrQpDI
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The first value is a full 32-bit integer representation of the register. The
second format shows the value of the special named bits. An uppercase letter means that
the bit is on while a lowercase letter indicates that the bit is off.
Examples |
|
%nmdebug > dr psw
PSW=0006ff0f=jthlnxbCVmrQPDI
%nmdebug > mpsw p
%nmdebug > dr psw
PSW=0006ff0b=jthlnxbCVmrQpDI
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Turn OFF the protection ID validation enable bit in the IPSW.
$nmdat > mpsw CD
$nmdat >
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Enable code and data translation. System Debug windows are affected by
these two bits.
