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arch: riscv: enable FPU of threads in unshared FP mode

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In unshared FP mode, only 1 thread can use FPU but kernel doesn't know
which one, so riscv arch would enable FPU of each thread.

Signed-off-by: Jim Shu <cwshu@andestech.com>
This commit is contained in:
Jim Shu 2021-05-19 02:43:13 +08:00 • committed by Kumar Gala
commit 1b4dad433f
1 changed files with 4 additions and 0 deletions
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4
arch/riscv/core/thread.c
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@ -86,10 +86,14 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
#endif /* CONFIG_PMP_STACK_GUARD */
#if defined(CONFIG_FPU) && defined(CONFIG_FPU_SHARING)
/* Shared FP mode: enable FPU of threads with K_FP_REGS. */
if ((thread->base.user_options & K_FP_REGS) != 0) {
stack_init->mstatus |= MSTATUS_FS_INIT;
}
stack_init->fp_state = 0;
#elif defined(CONFIG_FPU)
/* Unshared FP mode: enable FPU of each thread. */
stack_init->mstatus |= MSTATUS_FS_INIT;
#endif
stack_init->mepc = (ulong_t)z_thread_entry_wrapper;