[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PULL 12/44] target/mips/op_helper: Document Invalidate/Writeback opcode
From: |
Philippe Mathieu-Daudé |
Subject: |
[PULL 12/44] target/mips/op_helper: Document Invalidate/Writeback opcodes as no-op |
Date: |
Sat, 17 Oct 2020 16:02:11 +0200 |
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>
---
target/mips/op_helper.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/target/mips/op_helper.c b/target/mips/op_helper.c
index c15f5c07761..2496d1dd718 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;
}
--
2.26.2
- [PULL 00/44] mips-next patches for 2020-10-17, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 01/44] util/cutils: Introduce freq_to_str() to display Hertz units, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 02/44] hw/qdev-clock: Display error hint when clock is missing from device, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 03/44] hw/core/clock: Add the clock_new helper function, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 04/44] target/mips: Fix some comment spelling errors, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 05/44] target/mips: Demacro helpers for <ABS|CHS>.<D|S|PS>, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 06/44] target/mips: Demacro helpers for M<ADD|SUB>F.<D|S>, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 07/44] target/mips: Demacro helpers for <MAX|MAXA|MIN|MINA>.<D|S>, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 09/44] target/mips: Add loongson-ext lswc2 group of instructions (Part 2), Philippe Mathieu-Daudé, 2020/10/17
- [PULL 11/44] target/mips/op_helper: Convert multiple if() to switch case, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 12/44] target/mips/op_helper: Document Invalidate/Writeback opcodes as no-op,
Philippe Mathieu-Daudé <=
- [PULL 08/44] target/mips: Add loongson-ext lswc2 group of instructions (Part 1), Philippe Mathieu-Daudé, 2020/10/17
- [PULL 10/44] target/mips: Add loongson-ext lsdc2 group of instructions, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 13/44] target/mips/op_helper: Log unimplemented cache opcode, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 14/44] target/mips: Move cpu_mips_get_random() with CP0 helpers, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 15/44] target/mips/cp0_timer: Explicit unit in variable name, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 16/44] target/mips/cp0_timer: Document TIMER_PERIOD origin, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 17/44] target/mips: Move cp0_count_ns to CPUMIPSState, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 18/44] target/mips/cpu: Calculate the CP0 timer period using the CPU frequency, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 19/44] target/mips/cpu: Make cp0_count_rate a property, Philippe Mathieu-Daudé, 2020/10/17
- [PULL 20/44] target/mips/cpu: Allow the CPU to use dynamic frequencies, Philippe Mathieu-Daudé, 2020/10/17