M68k/ColdFire: FPU context initialization

Thomas Doerfler Thomas.Doerfler at embedded-brains.de
Mon Nov 5 17:48:15 UTC 2007


Hi,

we are currently adding FPU support for a ColdFire v4e CPU derivate.
After reading, re-reading (and reading again) the relevant files in
cpukit/score/cpu/m68k in the current M68K (with hardware FPU, e.g.
MC68040) CPU Context management, I have not found, where/how the FPU
context is initialized for a newly created thread.

Can somebody please guide me:

- Is the FPU context in an arbitrary state when a new thread is started?

- Or: Where is the code which defines the initial state of the FPU in a
new thred?

Any hint appreciated,

Thomas Dörfler.



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