From 9353abf16249c8e2e90769cbb5c8553df9d2beaa Mon Sep 17 00:00:00 2001
From: Anisetti Avinash Krishna <anisetti.avinash.krishna@intel.com>
Date: Fri, 13 Sep 2024 12:23:13 +0530
Subject: [PATCH] arch: x86: core: reboot_rst_cnt: Enable support for warm
 reboot

Enable support for warm reboot for x86 arch as per the Reset Control
Register description.

Signed-off-by: Anisetti Avinash Krishna <anisetti.avinash.krishna@intel.com>
---
 arch/x86/core/reboot_rst_cnt.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/core/reboot_rst_cnt.c b/arch/x86/core/reboot_rst_cnt.c
index e20b5b7ae33..3eafcf9709c 100644
--- a/arch/x86/core/reboot_rst_cnt.c
+++ b/arch/x86/core/reboot_rst_cnt.c
@@ -27,12 +27,22 @@ static inline void cold_reboot(void)
 	sys_out8(reset_value, X86_RST_CNT_REG);
 }
 
+static inline void warm_reboot(void)
+{
+	uint8_t reset_value = X86_RST_CNT_CPU_RST | X86_RST_CNT_SYS_RST;
+
+	sys_out8(reset_value, X86_RST_CNT_REG);
+}
+
 void __weak sys_arch_reboot(int type)
 {
 	switch (type) {
 	case SYS_REBOOT_COLD:
 		cold_reboot();
 		break;
+	case SYS_REBOOT_WARM:
+		warm_reboot();
+		break;
 	default:
 		/* do nothing */
 		break;