From 11bbe3997eebc2c295b562cc264ab68f75a3b7af Mon Sep 17 00:00:00 2001
From: Masayuki Ishikawa <masayuki.ishikawa@gmail.com>
Date: Mon, 4 May 2020 17:28:42 +0900
Subject: [PATCH] arch: x86: Add hlt instruction to save power in qemu_idle.c

---
 arch/x86/src/qemu/qemu_idle.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/src/qemu/qemu_idle.c b/arch/x86/src/qemu/qemu_idle.c
index c1c9cb896a..630fd44c46 100644
--- a/arch/x86/src/qemu/qemu_idle.c
+++ b/arch/x86/src/qemu/qemu_idle.c
@@ -83,5 +83,7 @@ void up_idle(void)
 
   /* Sleep until an interrupt occurs to save power */
 
+  __asm__ __volatile__ ("hlt");
+
 #endif
 }