[PATCH v2 0/4] target/nios2: Shadow register set, EIC and VIC

[Amir Gonnen <amir.gonnen@neuroblade.ai>]

Implement nios2 Shadow register set, EIC and VIC.

Currently nios2 on QEMU contains an internal Interrupt Controller.
The nios2 architecture can support a more powerful External Interrupt
Controller (EIC) instead of the internal, and implements special cpu
features to support it: Shadow register set and External Interrupt
Controller Interface.

This patch series introduces the necessary changes to the nios2 cpu to
support an External Interrupt Controller, and includes a Vectored
Interrupt Controller (VIC) device that can be attach to the EIC.

Following Peter's suggestion in the previous version, I've splitted this
into several independant patches that rely on each other incrementally
and added a board that wires up the VIC:

1. Shadow Register Set support on the nios2 core
2. External Interrupt Controller interface on the nios2 core
3. Vectored Interrupt Controller
4. A board that uses the VIC instead of the default internal interrupt
   controller

Signed-off-by: Amir Gonnen <amir.gonnen@neuroblade.ai>

Amir Gonnen (4):
  target/nios2: Shadow register set
  target/nios2: Exteral Interrupt Controller (EIC)
  hw/intc: Vectored Interrupt Controller (VIC)
  hw/nios2: Machine with a Vectored Interrupt Controller

 hw/intc/Kconfig           |   4 +
 hw/intc/meson.build       |   1 +
 hw/intc/nios2_vic.c       | 327 ++++++++++++++++++++++++++++++++++++++
 hw/nios2/10m50_devboard.c |  64 +++++++-
 target/nios2/cpu.c        |  59 +++++--
 target/nios2/cpu.h        |  69 +++++++-
 target/nios2/helper.c     |  33 +++-
 target/nios2/helper.h     |   3 +
 target/nios2/op_helper.c  |  31 +++-
 target/nios2/translate.c  |  32 +++-
 10 files changed, 597 insertions(+), 26 deletions(-)
 create mode 100644 hw/intc/nios2_vic.c

--
2.25.1


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