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

From: Francesco Lavra
Subject: Re: [PATCH 7/7] Add support for ARM UEFI ("EFI") platforms
Date: Mon, 01 Apr 2013 16:10:23 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:7.0.1) Gecko/20110929 Thunderbird/7.0.1

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.


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