Subversion Repositories mips_enhanced

LEON3 interrupt controller

CONFIG_IRQ3_ENABLE

  Say Y here to enable the LEON3 interrupt controller. This is needed

  if you want to be able to receive interrupts. Operating systems like

  Linux, RTEMS and eCos needs this option to be enabled. If you intend

  to use the Bare-C run-time and not use interrupts, you could disable

  the interrupt controller and save about 500 gates.

LEON3 interrupt controller broadcast

CONFIG_IRQ3_BROADCAST_ENABLE

  If enabled the broadcast register is used to determine which

  interrupt should be sent to all cpus instead of just the first

  one that consumes it.

Secondary interrupts

CONFIG_IRQ3_SEC

  The interrupt controller handles 15 interrupts by default (1 - 15).

  These correspond to the 15 SPARC asyncronous traps (0x11 - 0x1F),

  and AMBA interrupts 1 - 15. This option will enable 16 additional

  (secondary) interrupts, corresponding to AMBA interrupts 16 - 31.

  The secondary interrupts will be multiplexed onto one of the first

  15 interrupts. The total number of handled interrupts can then

  be up to 30 (14 primary and 16 secondary).

Number of interrupts

CONFIG_IRQ3_NSEC

  Defines which of the first 15 interrupts should be used for the

  secondary (16 - 31) interrupts. Interrupt 15 should be avoided

  since it is not maskable by the processor.