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kernel: arch: introduce k_float_enable()

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This patch introduce new API to enable FPU of thread. This is pair of
existed k_float_disable() API. And also add empty arch_float_enable()
into each architectures that have arch_float_disable(). The arc and
riscv already implemented arch_float_enable() so I do not touch
these implementations.

Motivation: Current Zephyr implementation does not allow to use FPU
on main and other system threads like as work queue. Users need to
create an other thread with K_FP_REGS for floating point programs.
Users can use FPU more easily if they can enable FPU on running
threads.

Signed-off-by: Katsuhiro Suzuki <katsuhiro@katsuster.net>
This commit is contained in:
Katsuhiro Suzuki 2021-02-01 15:16:53 +09:00 • committed by Carles Cufí
commit 59903e2934
10 changed files with 93 additions and 34 deletions
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arch/riscv/core/thread.c
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@ -152,7 +152,7 @@ int arch_float_disable(struct k_thread *thread)
}
int arch_float_enable(struct k_thread *thread)
int arch_float_enable(struct k_thread *thread, unsigned int options)
{
unsigned int key;