From: "Andreas Färber" <afaerber@suse.de>
To: Petar Jovanovic <petar.jovanovic@rt-rk.com>, qemu-devel@nongnu.org
Cc: petar.jovanovic@imgtec.com, aurelien@aurel32.net, rth@twiddle.net
Subject: Re: [Qemu-devel] [v5 PATCH] target-mips: implement UserLocal Register
Date: Wed, 18 Jun 2014 17:57:56 +0200 [thread overview]
Message-ID: <53A1B704.8010606@suse.de> (raw)
In-Reply-To: <1403106500-66930-1-git-send-email-petar.jovanovic@rt-rk.com>
Am 18.06.2014 17:48, schrieb Petar Jovanovic:
> From: Petar Jovanovic <petar.jovanovic@imgtec.com>
>
> From MIPS documentation (Volume III):
>
> UserLocal Register (CP0 Register 4, Select 2)
> Compliance Level: Recommended.
>
> The UserLocal register is a read-write register that is not interpreted by
> the hardware and conditionally readable via the RDHWR instruction.
>
> This register only exists if the Config3-ULRI register field is set.
>
> Privileged software may write this register with arbitrary information and
> make it accessible to unprivileged software via register 29 (ULR) of the
> RDHWR instruction. To do so, bit 29 of the HWREna register must be set to a
> 1 to enable unprivileged access to the register.
>
> Signed-off-by: Petar Jovanovic <petar.jovanovic@imgtec.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>
Andreas
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next prev parent reply other threads:[~2014-06-18 15:58 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-18 15:48 [Qemu-devel] [v5 PATCH] target-mips: implement UserLocal Register Petar Jovanovic
2014-06-18 15:57 ` Andreas Färber [this message]
2014-06-18 18:24 ` Aurelien Jarno
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