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| author | Philippe Mathieu-Daudé <f4bug@amsat.org> | 2020-08-13 19:49:22 +0200 |
|---|---|---|
| committer | Philippe Mathieu-Daudé <f4bug@amsat.org> | 2020-10-17 11:13:15 +0200 |
| commit | 45964263e42b9728dd206936c157bfd1bdb6918a (patch) | |
| tree | 735a7f5027b83370596430fbb5fc82e2a3c1d9de /target | |
| parent | 4a367cfb00d3779f0113f871e4b7cb550d068098 (diff) | |
| download | qemu-45964263e42b9728dd206936c157bfd1bdb6918a.zip qemu-45964263e42b9728dd206936c157bfd1bdb6918a.tar.gz qemu-45964263e42b9728dd206936c157bfd1bdb6918a.tar.bz2 | |
target/mips/op_helper: Document Invalidate/Writeback opcodes as no-op
QEMU does not model caches, so there is not much to do with the
Invalidate/Writeback opcodes. Make it explicit adding a comment.
Suggested-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Message-Id: <20200813181527.22551-3-f4bug@amsat.org>
Diffstat (limited to 'target')
| -rw-r--r-- | target/mips/op_helper.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/target/mips/op_helper.c b/target/mips/op_helper.c index c15f5c0..2496d1d 100644 --- a/target/mips/op_helper.c +++ b/target/mips/op_helper.c @@ -1586,6 +1586,11 @@ void helper_cache(CPUMIPSState *env, target_ulong addr, uint32_t op) memory_region_dispatch_read(env->itc_tag, index, &env->CP0_TagLo, MO_64, MEMTXATTRS_UNSPECIFIED); break; + case 0b000: /* Index Invalidate */ + case 0b100: /* Hit Invalidate */ + case 0b110: /* Hit Writeback */ + /* no-op */ + break; default: break; } |