This series fully models the behaviour of WFxT instructions. We
already had support for WFE for M-profile but we left off A-profile as
it has more potential sources of wake-ups. The main one is the event
stream which includes events from significant bits of the timer
ticking over.

The series starts with some refactoring of the syndrome register
helpers to use registerfields. We then expand the WFIT trap handling
to report the register used. We then implement the event stream events
for SEV, global monitor and the timer related ones before enabling WFE
for A-profile and then finally WFET.

Note on AI usage. As an experiment I previously posted a series with
the help of Gemini. This series however is a ground up
re-implementation which takes some different approaches on modelling
the event stream. In particular rather than running multiple timers we
use the same wxft timer and just compute if the timeout or timer event
will come first.

The only bits that remain from the Gemini experiment are the tests at
the end of the series. I've split up the patches and audited the
boot.S changes but I've still to go through the mini-GIC library and
the test case itself.

Alex.

Alex Bennée (35):
  target/arm: migrate basic syndrome helpers to registerfields
  target/arm: migrate system/cp trap syndromes to registerfields
  target/arm: migrate FP/SIMD trap syndromes to registerfields
  target/arm: migrate eret trap syndromes to registerfields
  target/arm: migrate SME trap syndromes to registerfields
  target/arm: migrate PAC trap syndromes to registerfields
  target/arm: migrate BTI trap syndromes to registerfields
  target/arm: migrate BXJ trap syndromes to registerfields
  target/arm: migrate Granule Protection traps to registerfields
  target/arm: migrate fault syndromes to registerfields
  target/arm: migrate debug syndromes to registerfields
  target/arm: migrate wfx syndromes to registerfields
  target/arm: migrate gcs syndromes to registerfields
  target/arm: migrate memory op syndromes to registerfields
  target/arm: migrate check_hcr_el2_trap to use syndrome helper
  target/arm: use syndrome helpers in arm_cpu_do_interrupt_aarch32_hyp
  target/arm: use syndrome helpers to set SAME_EL EC bit
  target/arm: make whpx use syndrome helpers for decode
  target/arm: make hvf use syndrome helpers for decode
  target/arm: use syndrome helpers in merge_syn_data_abort
  target/arm: use syndrome helpers to query VNCR bit
  target/arm: remove old syndrome defines
  target/arm: report register in WFIT syndromes
  target/arm: remove event_register check from arm_cpu_has_work
  target/arm: redefine event stream fields
  target/arm: add gt_calc_next_event_stream
  target/arm: wrap event_register in a union
  target/arm: ensure aarch64 DISAS_WFE will exit
  target/arm: implements SEV/SEVL for all modes
  target/arm: implement global monitor events
  target/arm: enable event stream on WFE instructions
  target/arm: implement WFET
  tests/tcg: split stage 1 between devices and RAM
  tests/tcg: create a mini-gic3 library
  tests/tcg: add basic test for aarch64 wf[ie][t] insns

 target/arm/cpu.h                          |  21 +-
 target/arm/internals.h                    |  12 +-
 target/arm/syndrome.h                     | 587 ++++++++++++++++++----
 target/arm/tcg/helper-defs.h              |   3 +-
 tests/tcg/aarch64/system/lib/gicv3.h      |  56 +++
 target/arm/tcg/a32.decode                 |   5 +-
 target/arm/tcg/a64.decode                 |   5 +-
 target/arm/tcg/t16.decode                 |   4 +-
 target/arm/tcg/t32.decode                 |   4 +-
 hw/intc/armv7m_nvic.c                     |   2 +-
 target/arm/cpu.c                          |  11 +-
 target/arm/helper.c                       |  97 +++-
 target/arm/hvf/hvf.c                      |  14 +-
 target/arm/machine.c                      |   4 +-
 target/arm/tcg/debug.c                    |   2 +-
 target/arm/tcg/m_helper.c                 |   4 +-
 target/arm/tcg/op_helper.c                | 122 ++++-
 target/arm/tcg/tlb_helper.c               |   6 +-
 target/arm/tcg/translate-a64.c            |  60 ++-
 target/arm/tcg/translate.c                |  19 +-
 target/arm/tcg/vfp_helper.c               |   5 +-
 target/arm/whpx/whpx-all.c                |  13 +-
 tests/tcg/aarch64/system/lib/gicv3.c      |  77 +++
 tests/tcg/aarch64/system/wfx.c            | 126 +++++
 tests/tcg/aarch64/Makefile.softmmu-target |  15 +-
 tests/tcg/aarch64/system/boot.S           |  55 +-
 26 files changed, 1116 insertions(+), 213 deletions(-)
 create mode 100644 tests/tcg/aarch64/system/lib/gicv3.h
 create mode 100644 tests/tcg/aarch64/system/lib/gicv3.c
 create mode 100644 tests/tcg/aarch64/system/wfx.c

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2.47.3