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[/] [openrisc/] [trunk/] [or1ksim/] [doc/] [or1ksim.texi] - Diff between revs 472 and 483

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@item l.nop 9
@item l.nop 9
@cindex @code{l.nop 9} (turn off tracing)
@cindex @code{l.nop 9} (turn off tracing)
 
 
Instruction tracing is turned off.
Instruction tracing is turned off.
 
 
 
@item l.nop 10
 
@cindex @code{l.nop 10} (return a random number)
 
 
 
A 32-bit random number is returned in @code{r11}.
 
 
 
The random numbers are generated using @code{random}, which in turn is
 
seeded through @code{srandom} using the host @file{/dev/urandom} if
 
available, or else the process ID of the @value{OR1KSIM} instance.
 
 
 
This opcode is particularly useful for situations where a target
 
program running on Or1ksim needs to obtain genuine system entropy to
 
generate random numbers.
 
 
 
@item l.nop 11
 
@cindex @code{l.nop 11} (return a non-zero value)
 
 
 
Return a non-zero value in @code{r11}.
 
 
 
This opcode can be used to detect if a target is running under
 
Or1ksim.  Set @code{r11} to zero, issue this opcode, and look to see
 
if @code{r11} is non-zero.
 
 
@end table
@end table
 
 
@node Configuration
@node Configuration
@chapter Configuration
@chapter Configuration
@cindex configuring @value{OR1KSIM}
@cindex configuring @value{OR1KSIM}

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