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kernel: introduce k_float_disable system call

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We introduce k_float_disable() system call, to allow threads to
disable floating point context preservation. The system call is
to be used in FP Sharing Registers mode (CONFIG_FP_SHARING=y).

Signed-off-by: Ioannis Glaropoulos <Ioannis.Glaropoulos@nordicsemi.no>
This commit is contained in:
Ioannis Glaropoulos 2019-05-09 21:55:10 +02:00 • committed by Andrew Boie
commit a6cb8b06db
3 changed files with 61 additions and 0 deletions
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23
include/kernel.h
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@ -4906,6 +4906,29 @@ __syscall void k_str_out(char *c, size_t n);
extern void z_arch_start_cpu(int cpu_num, k_thread_stack_t *stack, int sz,
void (*fn)(int key, void *data), void *arg);
/**
* @brief Disable preservation of floating point context information.
*
* This routine informs the kernel that the specified thread
* will no longer be using the floating point registers.
*
* @warning
* Some architectures apply restrictions on how the disabling of floating
* point preservation may be requested, see z_arch_float_disable.
*
* @warning
* This routine should only be used to disable floating point support for
* a thread that currently has such support enabled.
*
* @param thread ID of thread.
*
* @retval 0 On success.
* @retval -ENOSYS If the floating point disabling is not implemented.
* -EINVAL If the floating point disabling could not be performed.
*/
__syscall int k_float_disable(struct k_thread *thread);
#ifdef __cplusplus
}
#endif