From 6fbc032cbc83ba80009c4a2a18e4d5578bc9ba35 Mon Sep 17 00:00:00 2001
From: Richard Henderson <richard.henderson@linaro.org>
Date: Sat, 4 Nov 2023 22:12:24 -0700
Subject: [PATCH] target/sparc: Implement MWAIT
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Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
target/sparc/insns.decode | 1 +
target/sparc/translate.c | 11 +++++++++++
2 files changed, 12 insertions(+)
diff --git a/target/sparc/insns.decode b/target/sparc/insns.decode
index a7720560f8..fbcb4f7aef 100644
--- a/target/sparc/insns.decode
+++ b/target/sparc/insns.decode
@@ -124,6 +124,7 @@ CALL 01 i:s30
WRTICK_CMPR 10 10111 110000 ..... . ............. @n_r_ri
WRSTICK 10 11000 110000 ..... . ............. @n_r_ri
WRSTICK_CMPR 10 11001 110000 ..... . ............. @n_r_ri
+ WRMWAIT 10 11100 110000 ..... . ............. @n_r_ri
]
# Before v8, rs1==0 was WRY, and the rest executed as nop.
[
diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index b10936a61a..6d0ad38fd5 100644
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -3344,6 +3344,17 @@ static void do_wrpowerdown(DisasContext *dc, TCGv src)
TRANS(WRPOWERDOWN, POWERDOWN, do_wr_special, a, supervisor(dc), do_wrpowerdown)
+static void do_wrmwait(DisasContext *dc, TCGv src)
+{
+ /*
+ * TODO: This is a stub version of mwait, which merely recognizes
+ * interrupts immediately and does not wait.
+ */
+ dc->base.is_jmp = DISAS_EXIT;
+}
+
+TRANS(WRMWAIT, VIS4, do_wr_special, a, true, do_wrmwait)
+
static void do_wrpsr(DisasContext *dc, TCGv src)
{
gen_helper_wrpsr(tcg_env, src);