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Re: [PATCH 7/7] Add support for ARM UEFI ("EFI") platforms

From: Vladimir 'φ-coder/phcoder' Serbinenko
Subject: Re: [PATCH 7/7] Add support for ARM UEFI ("EFI") platforms
Date: Mon, 01 Apr 2013 16:16:06 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.12) Gecko/20130116 Icedove/10.0.12

On 01.04.2013 16:10, Francesco Lavra wrote:

> On 04/01/2013 01:23 PM, Vladimir 'φ-coder/phcoder' Serbinenko wrote:
>> get_time is wrong function for getting tsc. You should create a timer
>> event with 10000 units (=1 ms) and in its callback increase millisecond
>> counter.
> The problem is that such timer event would be machine-specific and
> wouldn't work across different ARM SoCs. So the best place to handle
> these machine-specific details would be in the platform firmware.
> Unfortunately the EFI spec doesn't have a standard mechanism to retrieve
> a timestamp counter, the most similar mechanism currently defined by the
> spec is the get_time service.

Looks at events in EFI spec. You can define a periodic event with 1ms
period and custom function as callback. Then you just need to count in
this function.

> --
> Francesco
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