T-Kernel Specification (1.B0.02)

5.4. INTERRUPT MANAGEMENT FUNCTIONS 249
void foo()
{
UINT
intsts;
DI(intsts);
if ( isDI(intsts) ) {
/* Interrupts were already disabled at the time this function was called.*/
} else {
/* Interrupts were enabled at the time this function was called. */
}
EI(intsts);
}
5.4.2 Control of Interrupt Controller
These functions control the interrupt controller.
Generally they do not perform any operation with respect to the CPU interrupt flag.
typedef UINT INTVEC; /* interrupt vector */
The specific details of the interrupt vectors (INTVEC) are implementation-dependent. Preferably, however,
they should be the same numbers as the interrupt definition numbers designated with tk def int,
or should allow for simple conversion to and from those numbers.
• UINT DINTNO( INTVEC intvec )
Converts an interrupt vector to the corresponding interrupt definition number.
• void EnableInt( INTVEC intvec )
• void EnableInt( INTVEC intvec, INT level )
Enables the interrupt designated in intvec.
In a system that allows interrupt priority level to be designated, the level parameter can be used to
designate the interrupt priority level. The precise meaning of level is implementation-dependent.
Both methods with and without the level designation must be provided.
• void DisableInt( INTVEC intvec )
Disables the interrupt designated in intvec.
Generally, interrupts raised while interrupts are disabled are made pending, and are raised after
interrupts are enabled by EnableInt(). ClearInt() must be used if it is desired to clear interrupts
occurring in interrupts disabled state.
• void ClearInt( INTVEC intvec )
Clears any interrupts raised for intvec.
• void EndOfInt( INTVEC intvec )
Issues EOI (End Of Interrupt) to the interrupt controller intvec must be an interrupt for which
EOI can be issued. Generally this must be executed at the end of an interrupt handler.
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T-Kernel 1.B0.02