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Flush CPU caches before entering S1, as noted in the specifications.

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This commit is contained in:
jruoho 2011-06-03 09:15:02 +00:00
parent f56267db07
commit 224e9f9368
1 changed files with 11 additions and 6 deletions
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17
sys/dev/acpi/acpi.c
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@ -1,4 +1,4 @@
/* $NetBSD: acpi.c,v 1.241 2011/05/31 14:27:44 jruoho Exp $ */
/* $NetBSD: acpi.c,v 1.242 2011/06/03 09:15:02 jruoho Exp $ */
/*-
* Copyright (c) 2003, 2007 The NetBSD Foundation, Inc.
@ -100,7 +100,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: acpi.c,v 1.241 2011/05/31 14:27:44 jruoho Exp $");
__KERNEL_RCSID(0, "$NetBSD: acpi.c,v 1.242 2011/06/03 09:15:02 jruoho Exp $");
#include "opt_acpi.h"
#include "opt_pcifixup.h"
@ -1301,12 +1301,17 @@ acpi_enter_sleep_state(int state)
if (state == ACPI_STATE_S1) {
/*
* Enter the state. Note that interrupts must
* be off before calling AcpiEnterSleepState().
* Conversely, AcpiLeaveSleepState() should
* always be called with interrupts enabled.
* Before the transition to S1, CPU caches
* must be flushed (see ACPI 4.0, 7.3.4.2).
*
* Note that interrupts must be off before
* calling AcpiEnterSleepState(). Conversely,
* AcpiLeaveSleepState() should always be
* called with interrupts enabled.
*/
acpi_md_OsDisableInterrupt();
ACPI_FLUSH_CPU_CACHE();
rv = AcpiEnterSleepState(state);
if (ACPI_FAILURE(rv))