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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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