linux-kernel - [PATCH] openrisc: define nop command for simulator reboot

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Message-Id: <20220428111139.1330966-1-Jason@zx2c4.com>
Date:   Thu, 28 Apr 2022 13:11:39 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     shorne@...il.com, openrisc@...ts.librecores.org,
        linux-kernel@...r.kernel.org
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>,
        Peter Maydell <peter.maydell@...aro.org>
Subject: [PATCH] openrisc: define nop command for simulator reboot

The simulator defines `l.nop 1` for shutdown, but doesn't have anything
for reboot. Use 13 for this, which is currently unused, dubbed
`NOP_REBOOT`.

Cc: Stafford Horne <shorne@...il.com>
Cc: Peter Maydell <peter.maydell@...aro.org>
Link: https://lore.kernel.org/all/YmnaDUpVI5ihgvg6@zx2c4.com/
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
 arch/openrisc/kernel/process.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/openrisc/kernel/process.c b/arch/openrisc/kernel/process.c
index 3c0c91bcdcba..4cce95fa6eb5 100644
--- a/arch/openrisc/kernel/process.c
+++ b/arch/openrisc/kernel/process.c
@@ -52,6 +52,8 @@ void machine_restart(char *cmd)
 {
 	do_kernel_restart(cmd);
 
+	__asm__("l.nop 13");
+
 	/* Give a grace period for failure to restart of 1s */
 	mdelay(1000);
 
-- 
2.35.1