[En-Nut-Discussion] Will the FPU from the STM32F4xx supported (context.c)?

[Ole Reinhardt]

Hi!

> You should be save if you only use the FPU in _one_ thread. Making the FPU
> context-switch/thread safe should be a configurable item, as there are many
> cases where it is not needed and the related overhead is not wanted.

If the FPU is available, how can you be sure _not_ to use the FPU? Won't
it be used implicitly by the compiler if a flotingpoint calculation is
executed? This may even be used by a library which you are not aware of.

So i would suggest to add the FPU registers to the context switch by
default and add a configuration option to _not_ save them if really wanted!

Bye,

Ole

-- 
kernel concepts GmbH            Tel: +49-271-771091-14
Sieghuetter Hauptweg 48         Mob: +49-177-7420433
D-57072 Siegen
http://www.embedded-it.de
http://www.kernelconcepts.de