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Re: [Qemu-devel] [v5 PATCH] target-mips: implement UserLocal Register


From: Andreas Färber
Subject: Re: [Qemu-devel] [v5 PATCH] target-mips: implement UserLocal Register
Date: Wed, 18 Jun 2014 17:57:56 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Am 18.06.2014 17:48, schrieb Petar Jovanovic:
> From: Petar Jovanovic <address@hidden>
> 
> 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 <address@hidden>

Reviewed-by: Andreas Färber <address@hidden>

Andreas

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