From: Ralf Baechle <ralf@linux-mips.org>
To: David Daney <ddaney@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Subject: Re: [PATCH] MIPS: Emulate 64-bit FPU on 64-bit CPUs.
Date: Tue, 3 Nov 2009 05:27:12 +0100 [thread overview]
Message-ID: <20091103042712.GA14423@linux-mips.org> (raw)
In-Reply-To: <1257190426-29346-1-git-send-email-ddaney@caviumnetworks.com>
On Mon, Nov 02, 2009 at 11:33:46AM -0800, David Daney wrote:
> Running a 64-bit kernel on a 64-bit CPU without an FPU would cause the
> emulator to run in 32-bit mode. The c0_Status.FR bit is wired to zero
> on systems without an FPU, so using that bit to decide how the
> emulator behaves doesn't allow for proper emulation on 64-bit FPU-less
> processors.
>
> Instead, we need to select the emulator mode based on the user-space
> ABI. Since the thread flag TIF_32BIT_REGS is used to set
> c0_Status.FR, we can just use it to decide if the emulator should be
> in 32-bit or 64-bit mode.
Thanks, applied!
Ralf
prev parent reply other threads:[~2009-11-03 4:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-11-02 19:33 [PATCH] MIPS: Emulate 64-bit FPU on 64-bit CPUs David Daney
2009-11-03 4:27 ` Ralf Baechle [this message]
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