From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: cache-l2x0: add resume entry for l2 in secure mode
Date: Wed, 21 Sep 2011 08:51:37 +0100 [thread overview]
Message-ID: <20110921075137.GE17169@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <CAGsJ_4xcWkGYrRoR_uSwtW6Qt4TkSWp+yQemP36sdF8o_Q=bLw@mail.gmail.com>
On Wed, Sep 21, 2011 at 03:49:23PM +0800, Barry Song wrote:
> 2011/9/21 Russell King - ARM Linux <linux@arm.linux.org.uk>:
> > On Wed, Sep 21, 2011 at 01:53:37PM +0800, Barry Song wrote:
> >> yes. imx6q actually needs to enable l2 earlier than cpu_resume(and mmu
> >> resume). so how about letting outer_resume support both phy and virt
> >> address restore?
> >
> > You can't call C functions in the kernel before the MMU is enabled.
>
> well. a direct call will fall into virtual address. then we need to
> transfer it to a phy address before calling it.
No. I say again, you can't call C functions in the kernel before the
MMU is enabled.
C functions have literal tables that contain absolute virtual addresses
of variables and such like. Without the MMU enabled, those addresses
are meaningless and won't point at the right place.
next prev parent reply other threads:[~2011-09-21 7:51 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-09-21 1:57 [PATCH] ARM: cache-l2x0: add resume entry for l2 in secure mode Barry Song
2011-09-21 5:52 ` Shawn Guo
2011-09-21 5:53 ` Barry Song
2011-09-21 6:58 ` Shawn Guo
2011-09-21 7:38 ` Russell King - ARM Linux
2011-09-21 7:49 ` Barry Song
2011-09-21 7:51 ` Russell King - ARM Linux [this message]
2011-09-21 7:53 ` Barry Song
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