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lib: sbi_illegal_insn: Add emulation for fence.tso

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While OpenC906 appears to properly decode `fence.tso` as a fence
instruction[1], the version of the C906 taped out in the Allwinner D1
does not, and raises illegal instruction.

Handle this errata by emulating `fence.tso` as `fence rw, rw`.

[1]: https://github.com/T-head-Semi/openc906/blob/30827e7f/C906_RTL_FACTORY/gen_rtl/idu/rtl/aq_idu_id_decd.v#L2097

Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Samuel Holland
2022-05-29 13:25:30 -05:00
committed by Anup Patel
parent ff65bfec4e
commit cb8271c8e4
2 changed files with 16 additions and 1 deletions
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3
include/sbi/riscv_encoding.h
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@@ -838,6 +838,9 @@
#define INSN_MASK_WFI 0xffffff00
#define INSN_MATCH_WFI 0x10500000
#define INSN_MASK_FENCE_TSO 0xffffffff
#define INSN_MATCH_FENCE_TSO 0x8330000f
#define INSN_16BIT_MASK 0x3
#define INSN_32BIT_MASK 0x1c