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[rtl,dv] Route KMAC interrupt to the PLIC (+ chip_kmac_irq) #677

Description

@martin-velay

KMAC's interrupt outputs (intr_kmac_done_o, intr_fifo_empty_o, intr_kmac_err_o) are left unconnected in hw/top_chip/rtl/top_chip_system.sv, and KMAC is absent from the PLIC intr_vector (free slots exist at [3:0] and [30:12]). As a result the chip_kmac_irq testpoint has no interrupt path to test.

Work:

  • RTL: route KMAC's interrupt into the PLIC intr_vector (allocate a free slot).
  • DV: implement chip_kmac_irq (kmac_irq_test / kmac_irq_test_cheri, V2) - a full PLIC claim/complete cycle for the KMAC done and FIFO-empty interrupts.

Blocked until the RTL routing lands.

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