From: linux@arm.linux.org.uk (Russell King - ARM Linux)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: Add SWP/SWPB emulation for ARMv7 processors (v3)
Date: Wed, 6 Jan 2010 16:32:34 +0000 [thread overview]
Message-ID: <20100106163234.GC1728@n2100.arm.linux.org.uk> (raw)
In-Reply-To: <1262795027.18401.28.camel@pc1117.cambridge.arm.com>
On Wed, Jan 06, 2010 at 04:23:47PM +0000, Catalin Marinas wrote:
> On ARMv6 onwards (where this user RO, kernel RO is supported) we cannot
> easily differentiate between the vectors page and a normal kernel page
> unless we use another L_PTE_ bit. We need the vectors page to be
> writable if there is no TLS register in hardware (I guess we could use
> domain switching to override this though). But on ARMv7 we always have a
> TLS register, so no need to write to the vectors page.
That's not the only reason you'd want to write to the vectors page.
You'll want to write to it to install or change FIQ handlers.
next prev parent reply other threads:[~2010-01-06 16:32 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-05 18:24 [PATCH] ARM: Add SWP/SWPB emulation for ARMv7 processors (v3) Leif Lindholm
2010-01-05 19:43 ` Jamie Lokier
2010-01-06 16:23 ` Catalin Marinas
2010-01-06 16:32 ` Russell King - ARM Linux [this message]
2010-01-06 16:58 ` Catalin Marinas
2010-01-06 18:17 ` Jamie Lokier
2010-01-07 9:59 ` Catalin Marinas
2010-01-08 14:19 ` Jamie Lokier
2010-01-06 19:19 ` Leif Lindholm
2010-01-06 19:36 ` Russell King - ARM Linux
2010-01-14 13:08 ` Leif Lindholm
-- strict thread matches above, loose matches on Subject: below --
2010-01-06 21:53 Jamie Lokier
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