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From: "Vladimir 'φ-coder/phcoder' Serbinenko" <phcoder@gmail.com>
To: The development of GNU GRUB <grub-devel@gnu.org>
Subject: Re: [PATCH 7/7] Add support for ARM UEFI ("EFI") platforms
Date: Mon, 01 Apr 2013 16:16:06 +0200	[thread overview]
Message-ID: <515996A6.8010804@gmail.com> (raw)
In-Reply-To: <5159954F.5090207@gmail.com>

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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
> 
> _______________________________________________
> Grub-devel mailing list
> Grub-devel@gnu.org
> https://lists.gnu.org/mailman/listinfo/grub-devel




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  reply	other threads:[~2013-04-01 14:16 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-24 17:01 [PATCH 7/7] Add support for ARM UEFI ("EFI") platforms Leif Lindholm
2013-04-01  2:31 ` Vladimir 'φ-coder/phcoder' Serbinenko
2013-04-01 10:41   ` Francesco Lavra
2013-04-01 11:23     ` Vladimir 'φ-coder/phcoder' Serbinenko
2013-04-01 14:10       ` Francesco Lavra
2013-04-01 14:16         ` Vladimir 'φ-coder/phcoder' Serbinenko [this message]
2013-04-01 14:49           ` Francesco Lavra
2013-04-03 17:50   ` Leif Lindholm
2013-04-01 16:24 ` Francesco Lavra
2013-04-03 18:07   ` Leif Lindholm
2013-04-03 20:01     ` Vladimir 'φ-coder/phcoder' Serbinenko
2013-04-04 12:54       ` Leif Lindholm
2013-04-09 17:30         ` Vladimir 'φ-coder/phcoder' Serbinenko
2013-05-09 18:08           ` Leif Lindholm
2013-05-11  8:42             ` Vladimir 'φ-coder/phcoder' Serbinenko
2013-05-11 18:00             ` Francesco Lavra

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