RTEMS 4.9.4 On-Line Library

Miscellaneous Support Files set_vector() - Install an Interrupt Vector

BSP and Device Driver Development Guide

5.10: set_vector() - Install an Interrupt Vector

On targets with Simple Vectored Interrupts, the BSP must provide an implementation of the set_vector routine. This routine is responsible for installing an interrupt vector. It invokes the support routines necessary to install an interrupt handler as either a "raw" or an RTEMS interrupt handler. Raw handlers bypass the RTEMS interrupt structure and are responsible for saving and restoring all their own registers. Raw handlers are useful for handling traps, debug vectors, etc..

The set_vector routine is a central place to perform interrupt controller manipulation and encapsulate that information. It is usually implemented as follows:

rtems_isr_entry set_vector(                     /* returns old vector */
  rtems_isr_entry     handler,                  /* isr routine        */
  rtems_vector_number vector,                   /* vector number      */
  int                 type                      /* RTEMS or RAW intr  */
)
{
  if the type is RAW
    install the raw vector
  else
    use rtems_interrupt_catch to install the vector

  perform any interrupt controller necessary to unmask
    the interrupt source

  return the previous handler
}

NOTE: The i386, PowerPC and ARM ports use a Programmable Interrupt Controller model which does not require the BSP to implement set_vector. BSPs for these architectures must provide a different set of support routines.

BSP and Device Driver Development Guide