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From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH] ARM hibernation / suspend-to-disk support code
Date: Fri, 20 May 2011 19:05:10 +0100	[thread overview]
Message-ID: <20110520180510.GE7445@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <20110520113758.GA3141@arm.com>

On Fri, May 20, 2011 at 12:37:58PM +0100, Dave Martin wrote:
> Where do we save/restore r8_FIQ..r13_FIQ, r13_IRQ, r13_UND and r13_ABT?
> (I'm assuming there's no reason to save/restore r14 or SPSR for any
> exception mode, since we presumably aren't going to suspend/resume
> from inside an exception handler (?))

There is absolutely no need to save r13 for _any_ of the abort modes.  As
we have to set them up at boot time to fixed values, we keep that code
around, and in the resume paths we re-execute that initialization code.
cpu_init().

Out of the list you mention above, the only thing which isn't saved are the
FIQ registers, and that's a problem for S2RAM too, and should be done by
arch/arm/kernel/fiq.c hooking into the suspend paths.

  parent reply	other threads:[~2011-05-20 18:05 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <3DCE2F529B282E4B8F53D4D8AA406A07014FFE@008-AM1MPN1-022.mgdnok.nokia.com>
2011-05-19 17:31 ` [RFC PATCH] ARM hibernation / suspend-to-disk support code Frank Hofmann
2011-05-20 11:37   ` Dave Martin
2011-05-20 11:37   ` Dave Martin
2011-05-20 12:39     ` Frank Hofmann
2011-05-20 12:39       ` Frank Hofmann
2011-05-20 15:03       ` Dave Martin
2011-05-20 15:03       ` Dave Martin
2011-05-20 16:24         ` Frank Hofmann
2011-05-23  9:42           ` Dave Martin
2011-05-23  9:42           ` Dave Martin
2011-05-20 16:24         ` Frank Hofmann
2011-05-20 17:53         ` Nicolas Pitre
2011-05-20 17:53         ` Nicolas Pitre
2011-05-20 18:07       ` Russell King - ARM Linux
2011-05-20 18:07       ` Russell King - ARM Linux
2011-05-22  6:39         ` Frank Hofmann
2011-05-20 22:27       ` [linux-pm] " Rafael J. Wysocki
2011-05-22  7:01         ` Frank Hofmann
2011-05-22  9:54           ` Rafael J. Wysocki
2011-05-22  9:54           ` Rafael J. Wysocki
2011-05-22  7:01         ` Frank Hofmann
2011-05-23  9:52         ` Dave Martin
2011-05-23  9:52         ` [linux-pm] " Dave Martin
2011-05-23 13:37           ` Frank Hofmann
2011-05-23 14:32             ` Russell King - ARM Linux
2011-05-23 14:32               ` [linux-pm] " Russell King - ARM Linux
2011-05-23 15:57               ` [RFC PATCH v2] " Frank Hofmann
2011-05-23 15:57               ` Frank Hofmann
2011-05-23 13:37           ` [RFC PATCH] " Frank Hofmann
2011-05-20 22:27       ` Rafael J. Wysocki
2011-05-20 18:05     ` Russell King - ARM Linux
2011-05-20 18:05     ` Russell King - ARM Linux [this message]
2011-05-23 10:01       ` Dave Martin
2011-05-23 10:12         ` Russell King - ARM Linux
2011-05-23 10:12         ` Russell King - ARM Linux
2011-05-23 11:16           ` Dave Martin
2011-05-23 16:11             ` Russell King - ARM Linux
2011-05-23 16:38               ` Dave Martin
2011-05-24 12:33                 ` Frank Hofmann
2011-05-24 12:33                 ` Frank Hofmann
2011-05-23 16:38               ` Dave Martin
2011-05-23 16:11             ` Russell King - ARM Linux
2011-05-23 11:16           ` Dave Martin
2011-05-23 10:01       ` Dave Martin
2011-05-24 13:27     ` [RFC] ARM hibernation, cpu-type-specific code Frank Hofmann
2011-05-19 17:31 ` [RFC PATCH] ARM hibernation / suspend-to-disk support code Frank Hofmann

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