[RFC PATCH 0/3] OpenRISC Semihosting and Virt

[Stafford Horne]

Hello,

I provide 2 options here 2 help with OpenRISC CI testing sush as the wireguard
testing that Jason has been working on.

The two are:

 1. Add semihosting to openrisc to handle l.nop based Halt and Reset
 2. Define a new virt platform, this includes widing in the sifive test device
    that provides a syscon interface to allow for shutdown and reboot.

We could upstream both of them or just one. I am leaning toward dropping the
semi-hosting work and just going ahead with virt.

The semi-hosting stuff was discussed here:

 - https://www.mail-archive.com/qemu-devel@nongnu.org/msg884560.html

Also, I started to propose architecture changes here:

 - https://github.com/openrisc/openrisc.github.io/pull/18

However, looking at how other platforms define semihosting it seems the openrisc
requirements are quite different.  We do not use the open/close/write etc
syscalls as riscv, arm etc do.

Stafford Horne (3):
  target/openrisc: Add basic support for semihosting
  hw/openrisc: Split re-usable boot time apis out to boot.c
  hw/openrisc: Add the OpenRISC virtual machine

 configs/devices/or1k-softmmu/default.mak |   3 +
 hw/openrisc/Kconfig                      |   9 +
 hw/openrisc/boot.c                       | 127 +++++++
 hw/openrisc/meson.build                  |   2 +
 hw/openrisc/openrisc_sim.c               | 106 +-----
 hw/openrisc/virt.c                       | 429 +++++++++++++++++++++++
 include/hw/openrisc/boot.h               |  34 ++
 qemu-options.hx                          |  16 +-
 target/openrisc/cpu.h                    |   2 +
 target/openrisc/helper.h                 |   1 +
 target/openrisc/meson.build              |   1 +
 target/openrisc/openrisc-semi.c          |  54 +++
 target/openrisc/sys_helper.c             |   5 +
 target/openrisc/translate.c              |   6 +
 14 files changed, 690 insertions(+), 105 deletions(-)
 create mode 100644 hw/openrisc/boot.c
 create mode 100644 hw/openrisc/virt.c
 create mode 100644 include/hw/openrisc/boot.h
 create mode 100644 target/openrisc/openrisc-semi.c

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2.31.1