[linuxsh-dev] Re: FPU in kernel (SH-4)

[NIIBE Y. <gn...@m1...>]

Masahiro Abe wrote:
 > RTLinux for SH4 uses FPU. Or more precisely, real-time task running
 > under rtlinux can use fpu. There can be more than one task running
 > simultaneously.

How do you use it?  Save all FPU registers at context switch or
interrupts?

Do we need FPU in the interrupt handlers?  If we can assume there's no
use of FPU in interrupt handlers, any task (including kernel threads)
works well with lazy save/restore.
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