Re: [Xen-devel] [PATCH v1 3/3] xen/arm: Introduce support for Renesas R-Car Gen2 platform

[Iurii Konovalenko <iurii.konovalenko@xxxxxxxxxxxxxxx>]

I tried to add instruction: asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));

Also I tried to write it via Xen API: WRITE_SYSREG32(freq, CNTFRQ_EL0);

But unfortunately Xen fails on both this instructions with "Undefined instruction" exception.

You can see log in attachment.

Could you please suggest reason, why it happens?

Best regards.

Iurii KonovalenkoÂ| Senior Software Engineer

GlobalLogic
PÂ+3.8044.492.9695 M +38.099.932.2909ÂÂ

SÂyufuntik

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On Fri, Jan 16, 2015 at 5:32 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote:

On 16/01/15 15:29, Iurii Konovalenko wrote:
>> Is there any reason that this code diverge?
>>
>
> Linux kernel 3.14-ltsi, which I used as a reference, use CNTFID0
> in file arch/arm/mach-shmobile/setup-rcar-gen2.c:
> iowrite32(freq, base + CNTFID0);

Which seems different from upstream:

1. /* Update registers with correct frequency */
2. iowrite32(freq, base + CNTFID0);
3. asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
4.
5. /* make sure arch timer is started by setting bit 0 of CNTCR */
6. iowrite32(1, base + CNTCR);

Regards,

--
Julien Grall

Attachment: renesas.log
Description: Text Data

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