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Date: Tue, 14 Apr 2015 17:55:39 +0800
From: Shannon Zhao <zhaoshenglong@huawei.com>
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Subject: Re: [Qemu-devel] [PATCH v4 19/20] hw/arm/virt-acpi-build: Add PCIe
 controller in ACPI DSDT table
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: hangaohuai@huawei.com, "Michael S. Tsirkin" <mst@redhat.com>, Alexander Spyridakis <a.spyridakis@virtualopensystems.com>, Mark Salter <msalter@redhat.com>, Claudio Fontana <claudio.fontana@huawei.com>, QEMU Developers <qemu-devel@nongnu.org>, Laszlo Ersek <lersek@redhat.com>, Hanjun Guo <hanjun.guo@linaro.org>, Igor Mammedov <imammedo@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>, "Huangpeng
	(Peter)" <peter.huangpeng@huawei.com>, =?UTF-8?B?QWxleCBCZW5uw6ll?= <alex.bennee@linaro.org>, Christoffer Dall <christoffer.dall@linaro.org>, Shannon Zhao <shannon.zhao@linaro.org>

On 2015/4/14 17:30, Peter Maydell wrote:
> On 14 April 2015 at 02:10, Shannon Zhao <zhaoshenglong@huawei.com> wrote:
>> On 2015/4/13 23:58, Alex Bennée wrote:
>>>
>>> Shannon Zhao <zhaoshenglong@huawei.com> writes:
>>>> +    UUID = aml_touuid(0x33DB4D5B, 0x1FF7, 0x401C, 0x9657,
>>>> 0x7441C03DD766);
>>>
>>> This looks like a fairly unreadable uuid already. What are these magic numbers?
>>>
>>
>> Yes, this will be modified to use string according to the spec. Like below way:
>>
>> UUID = aml_touuid("33DB4D5B-1FF7-401C-9657-7441C03DD766");
> 
> Those are still magic numbers, you've  just put them into
> a different format. Where do they come from? What do they mean?
> 

This is from the PCI Firmware Spec.

"The _OSC interface for a PCI/PCI-X/PCI Express hierarchy is identified by the Universal Unique
IDentifier (UUID) 33db4d5b-1ff7-401c-9657-7441c03dd766."

"The UUID in _DSM in this context is {E5C937D0-3553-4d7a-9117-EA4D19C3434D}"

Maybe I should use a macro definition for them.

-- 
Thanks,
Shannon