CPU Interrupt Control
These functions are for CPU external interrupt flag control. Generally they do not perform any operation on the interrupt controller.
The interrupt system is highly hardware dependent and varies according to systems, so it is difficult to standardize interrupt control. Therefore, with respect to the interrupt control, only DI, EI, and isDI are defined as the standard specification.
DI, EI, and isDI functions are provided as library functions or C language macros. These can be called from a task-independent portion and while dispatching and interrupts are disabled.
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