From: Christoph Muellner<cmuellner@linux.com>
Zicbom is the Cache-Block Management extension defined in the already
ratified RISC-V Base Cache Management Operation (CBO) ISA extension [1].
The extension contains three instructions: cbo.clean, cbo.flush and
cbo.inval. All of them must be implemented in the same group as LQ and
cbo.zero due to overlapping patterns.
All these instructions can throw a Illegal Instruction/Virtual
Instruction exception, similar to the existing cbo.zero. The same
check_zicbo_envcfg() is used to handle these exceptions.
Aside from that, these instructions also need to handle page faults and
guest page faults. This is done in a new check_zicbom_access() helper.
As with Zicboz, the cache block size for Zicbom is also configurable.
Note that the spec determines that Zicbo[mp] and Zicboz can have
different cache sizes (Section 2.7 of [1]), so we also include a
'cbom_blocksize' to go along with the existing 'cboz_blocksize'. They
are set to the same size, so unless users want to play around with the
settings both sizes will be the same.
[1]https://github.com/riscv/riscv-CMOs/blob/master/specifications/cmobase-v1.0.1.pdf
Co-developed-by: Philipp Tomsich<philipp.tomsich@vrull.eu>
Signed-off-by: Christoph Muellner<cmuellner@linux.com>
Signed-off-by: Daniel Henrique Barboza<dbarboza@ventanamicro.com>
---
target/riscv/cpu.c | 3 +
target/riscv/cpu.h | 2 +
target/riscv/helper.h | 2 +
target/riscv/insn32.decode | 5 ++
target/riscv/insn_trans/trans_rvzicbo.c.inc | 27 +++++++++
target/riscv/op_helper.c | 67 +++++++++++++++++++++
6 files changed, 106 insertions(+)