This patch set gives an implementation of "RISC-V Core-Local Interrupt
Controller(CLIC) Version 0.9-draft-20210217". It comes from [1], where
you can find the pdf format or the source code.
I take over the job from Michael Clark, who gave the first implementation
of clic-v0.7 specification. If there is any copyright question, please
let me know.
Features:
1. support four kinds of trigger types.
2. Preserve the CSR WARL/WPRI semantics.
3. Option to select different modes, such as M/S/U or M/U.
4. At most 4096 interrupts.
5. At most 1024 apertures.
Todo:
1. Encode the interrupt trigger information to exccode.
2. Support complete CSR mclicbase when its number is fixed.
3. Gave each aperture an independend address.
It have passed my qtest case and freertos test. Welcome to have a try
for your hardware.
Any advice is welcomed. Thanks very much.
Zhiwei
[1] specification website: https://github.com/riscv/riscv-fast-interrupt.
[2] Michael Clark origin work: https://github.com/sifive/riscv-qemu/tree/sifive-clic.
LIU Zhiwei (11):
target/riscv: Add CLIC CSR mintstatus
target/riscv: Update CSR xintthresh in CLIC mode
hw/intc: Add CLIC device
target/riscv: Update CSR xie in CLIC mode
target/riscv: Update CSR xip in CLIC mode
target/riscv: Update CSR xtvec in CLIC mode
target/riscv: Update CSR xtvt in CLIC mode
target/riscv: Update CSR xnxti in CLIC mode
target/riscv: Update CSR mclicbase in CLIC mode
target/riscv: Update interrupt handling in CLIC mode
target/riscv: Update interrupt return in CLIC mode
default-configs/devices/riscv32-softmmu.mak | 1 +
default-configs/devices/riscv64-softmmu.mak | 1 +
hw/intc/Kconfig | 3 +
hw/intc/meson.build | 1 +
hw/intc/riscv_clic.c | 836 ++++++++++++++++++++
include/hw/intc/riscv_clic.h | 103 +++
target/riscv/cpu.h | 9 +
target/riscv/cpu_bits.h | 32 +
target/riscv/cpu_helper.c | 117 ++-
target/riscv/csr.c | 247 +++++-
target/riscv/op_helper.c | 25 +
11 files changed, 1363 insertions(+), 12 deletions(-)
create mode 100644 hw/intc/riscv_clic.c
create mode 100644 include/hw/intc/riscv_clic.h
--
2.25.1
After reviewing this patchset.
I found that CLIC v0.8 spec is quite incomplete.
It lacks all S-mode related CSRs.
If you think that it's just the v0.8 spec issue for not covering
all the required S-mode related CSRs -- and we should include them
in CLIC v0.8 implementation even it's not documented explicitly.
You can just ignore my comments in regard to S-mode CSRs for v0.8 CLIC.
(Besides mintthresh, v0.8 spec does say that it holds the 8-bit field
interrupt thresholds for each privilege mode.)
Regards,
Frank Chang