commit 6fbc032cbc83ba80009c4a2a18e4d5578bc9ba35
author Richard Henderson <richard.henderson@linaro.org> Sat Nov 04 22:12:24 2023 -0700
committer Richard Henderson <richard.henderson@linaro.org> Wed Jun 05 09:10:02 2024 -0700
tree 3cf73c2b64e13cfdaea36dfdd4533e9259d9d563
parent 56f2ef9c7958320d574448f555cc3a82e500c485

target/sparc: Implement MWAIT

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

target/sparc/insns.decode

diff --git a/target/sparc/insns.decode b/target/sparc/insns.decode
index a772056..fbcb4f7 100644
--- a/target/sparc/insns.decode
+++ b/target/sparc/insns.decode
@@ -124,6 +124,7 @@
     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.
   [

target/sparc/translate.c

diff --git a/target/sparc/translate.c b/target/sparc/translate.c
index b10936a..6d0ad38 100644
--- a/target/sparc/translate.c
+++ b/target/sparc/translate.c
@@ -3344,6 +3344,17 @@
 
 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);