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From: mitchalsup@aol.com (MitchAlsup1)
Newsgroups: comp.arch
Subject: Re: Privilege Levels Below User
Date: Sun, 9 Jun 2024 00:29:42 +0000
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BGB wrote:

> On 6/8/2024 11:01 AM, EricP wrote:
>> Scott Lurndal wrote:
>>> John Savard <quadibloc@servername.invalid> writes:

> Though, the time returned by the CPUID microsecond timer is not 
> currently the same as the one given by "TK_GetTimeUS()", where the 
> latter effectively gives a 64-bit value (conceptually) representing the
> 
> number of microseconds since 1/1/1970; though with the kernel currently
> 
> assuming that its build-time is the starting time for the clock (and 
> none of the FPGA boards support a hardware clock, and one would need 
> internet access to use NTP, ...).

> A 64-bit value in microseconds can express around +/- 300k years, which
> 
> should be plenty.

What do you do when you need a 200 picosecond timer ?? (5GHz cycle
counter)

> A 64-bit value expressed in seconds could express values relative to
> the
> current age of the universe, but this is likely unnecessary for most 
> purposes, and ability to express fractions of a second is likely more 
> useful than the ability to express the age of the universe.

Interesting factoid::
The universe is currently 10^80 Plank times old since Big Bang,
and universe will die around 10^80 years,
and there are about 10^80-10^88 particles in the universe.

> Granted, one could use a 128-bit value, and have both (and in 
> picoseconds if they wanted). But, this would be overkill.

> Or, go extra overkill, and use 256 bits, to express the current age of 
> the universe in Planck units...

160-bits will be shown to be sufficient to count Plank times.