pSOSystem System Calls - Read

pSOS+ System Calls t_mode
Return Value
Error Codes
Notes
can simply specify that all interrupts are either enabled or disabled. Details are
provided below:
PPC
x86
MIPS
ARM
NOTE: t_mode() stores in old_mode the previous setting of the interrupt
control value as stored in the task's TCB (called the true mode), rather
than the value in the task's processor status register (called the transient
mode.) These two modes are normally the same. The one instance when
they can be different is if the task changes the interrupt control value
without using t_mode().
Processor Mode
t_mode() cannot modify the task’s processor mode. Most processors only have one
processor mode, so this is not relevant. Exceptions are handled as follows:
This system call always returns 0.
None.
Multiprocessor Considerations
None. Because t_mode() affects only the calling task, its action stays on the local
node.
Callable From
■ Task
On PowerPC, x86, MIPS, and ARM processors, you can simply enable or
disable all hardware interrupts. To do this, you place both T_ISR and
T_NOISR in the mask argument and place either T_ISR or T_NOISR in
the new_mode argument.
pSOSystem System Calls 1-147
1