Module Name: src
Committed By: skrll
Date: Sat May 14 06:07:53 UTC 2022
Modified Files:
src/sys/arch/hppa/hppa: idle_machdep.c machdep.c
Log Message:
Add some special NOPs to help qemu.
thanks to Helge Deller for the heads-up.
To generate a diff of this commit:
cvs rdiff -u -r1.3 -r1.4 src/sys/arch/hppa/hppa/idle_machdep.c
cvs rdiff -u -r1.16 -r1.17 src/sys/arch/hppa/hppa/machdep.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/arch/hppa/hppa/idle_machdep.c
diff -u src/sys/arch/hppa/hppa/idle_machdep.c:1.3 src/sys/arch/hppa/hppa/idle_machdep.c:1.4
--- src/sys/arch/hppa/hppa/idle_machdep.c:1.3 Mon Apr 15 20:45:08 2019
+++ src/sys/arch/hppa/hppa/idle_machdep.c Sat May 14 06:07:53 2022
@@ -1,4 +1,4 @@
-/* $NetBSD: idle_machdep.c,v 1.3 2019/04/15 20:45:08 skrll Exp $ */
+/* $NetBSD: idle_machdep.c,v 1.4 2022/05/14 06:07:53 skrll Exp $ */
/*
* Copyright (c) 2002, 2006, 2007 YAMAMOTO Takashi,
@@ -28,7 +28,7 @@
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: idle_machdep.c,v 1.3 2019/04/15 20:45:08 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: idle_machdep.c,v 1.4 2022/05/14 06:07:53 skrll Exp $");
#include <sys/param.h>
#include <sys/cpu.h>
@@ -36,5 +36,8 @@ __KERNEL_RCSID(0, "$NetBSD: idle_machdep
void
cpu_idle(void)
{
- /* do nothing */
+ /*
+ * This NOP instruction is used by qemu to detect the idle loop.
+ */
+ __asm volatile("or %%r10,%%r10,%%r10" ::: "memory");
}
Index: src/sys/arch/hppa/hppa/machdep.c
diff -u src/sys/arch/hppa/hppa/machdep.c:1.16 src/sys/arch/hppa/hppa/machdep.c:1.17
--- src/sys/arch/hppa/hppa/machdep.c:1.16 Mon Sep 14 16:11:32 2020
+++ src/sys/arch/hppa/hppa/machdep.c Sat May 14 06:07:53 2022
@@ -1,4 +1,4 @@
-/* $NetBSD: machdep.c,v 1.16 2020/09/14 16:11:32 skrll Exp $ */
+/* $NetBSD: machdep.c,v 1.17 2022/05/14 06:07:53 skrll Exp $ */
/*-
* Copyright (c) 2001, 2002 The NetBSD Foundation, Inc.
@@ -58,7 +58,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.16 2020/09/14 16:11:32 skrll Exp $");
+__KERNEL_RCSID(0, "$NetBSD: machdep.c,v 1.17 2022/05/14 06:07:53 skrll Exp $");
#include "opt_cputype.h"
#include "opt_ddb.h"
@@ -1447,8 +1447,13 @@ cpu_reboot(int howto, char *user_boot_st
:: "r" (CMD_RESET), "r" (HPPA_LBCAST + iomod_command));
}
- for (;;)
- /* loop while bus reset is coming up */ ;
+ for (;;) {
+ /*
+ * loop while bus reset is coming up. This NOP instruction
+ * is used by qemu to detect the 'death loop'.
+ */
+ __asm volatile("or %%r31, %%r31, %%r31" ::: "memory");
+ }
/* NOTREACHED */
}
