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authorWeiwei Li2022-07-18 15:09:55 +0200
committerAlistair Francis2022-09-07 09:18:32 +0200
commit5de124538b618c864508868eae505e77149649b7 (patch)
treeea40b819d4569513111e04ad6044a215c6eb2c96 /pc-bios/s390-ccw/cio.h
parenttarget/riscv: Fix checks in hmode/hmode32 (diff)
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target/riscv: Simplify the check in hmode to reuse the check in riscv_csrrw_check
Just add 1 to the effective privledge level when in HS mode, then reuse the check of 'effective_priv < csr_priv' in riscv_csrrw_check to replace the privilege level related check in hmode. Then, hmode will only check whether H extension is supported. When accessing Hypervior CSRs: 1) If accessing from M privilege level, the check of 'effective_priv< csr_priv' passes, returns hmode(...) which will return RISCV_EXCP_ILLEGAL_INST when H extension is not supported and return RISCV_EXCP_NONE otherwise. 2) If accessing from HS privilege level, effective_priv will add 1, the check passes and also returns hmode(...) too. 3) If accessing from VS/VU privilege level, the check fails, and returns RISCV_EXCP_VIRT_INSTRUCTION_FAULT 4) If accessing from U privilege level, the check fails, and returns RISCV_EXCP_ILLEGAL_INST Signed-off-by: Weiwei Li <liweiwei@iscas.ac.cn> Signed-off-by: Junqiang Wang <wangjunqiang@iscas.ac.cn> Reviewed-by: Alistair Francis <alistair.francis@wdc.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Message-Id: <20220718130955.11899-7-liweiwei@iscas.ac.cn> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Diffstat (limited to 'pc-bios/s390-ccw/cio.h')
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