[PATCH v5 0/3] Implement Sstc extension

[Atish Patra <atishp@rivosinc.com>]

This series implements Sstc extension[1] which was ratified recently.

The first patch is a prepartory patches while PATCH 2 adds stimecmp
support while PATCH 3 adds vstimecmp support. This series is based on
on top of upstream commit (faee5441a038).

The series can also be found at
https://github.com/atishp04/qemu/tree/sstc_v5

It is tested on RV32 & RV64 with latest OpenSBI & Linux kernel[2]
patches. It does require the mcountinhibit support patch from PMU series[3]
or dummy one from Anup's series [4]. Otherwise, OpenSBI doesn't detect v1.12
priv version.

Changes from v4->v5:
1. Removed any ordering related flags and emulate the hardware more
   closely. 

Changes from v3->v4:
1. Added [v]stimecmp_wr_done to the corresponding vmstate strucuture.

Changes from v2->v3:
1. Dropped generic migration code improvement patches.
2. Removed the order constraints while updating stimecmp/vstimecmp.

Changes from v1->v2:
1. Rebased on the latest upstream commit.
2. Replaced PATCH 1 with another patch where mtimer/timecmp is
   moved from CPU to ACLINT.
3. Added ACLINT migration support.

[1] https://drive.google.com/file/d/1m84Re2yK8m_vbW7TspvevCDR82MOBaSX/view
[2] https://github.com/atishp04/linux/tree/sstc_v4
[3] https://github.com/atishp04/qemu/tree/riscv_pmu_v7
[4] https://www.mail-archive.com/qemu-devel@nongnu.org/msg885157.html

Atish Patra (3):
hw/intc: Move mtimer/mtimecmp to aclint
target/riscv: Add stimecmp support
target/riscv: Add vstimecmp support

hw/intc/riscv_aclint.c         |  41 +++++---
hw/timer/ibex_timer.c          |  18 ++--
include/hw/intc/riscv_aclint.h |   2 +
include/hw/timer/ibex_timer.h  |   2 +
target/riscv/cpu.c             |   8 ++
target/riscv/cpu.h             |  11 +-
target/riscv/cpu_bits.h        |   8 ++
target/riscv/cpu_helper.c      |  11 +-
target/riscv/csr.c             | 177 +++++++++++++++++++++++++++++++++
target/riscv/machine.c         |   7 +-
target/riscv/meson.build       |   3 +-
target/riscv/time_helper.c     | 114 +++++++++++++++++++++
target/riscv/time_helper.h     |  30 ++++++
13 files changed, 400 insertions(+), 32 deletions(-)
create mode 100644 target/riscv/time_helper.c
create mode 100644 target/riscv/time_helper.h

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2.25.1