105 lines
1.9 KiB
C
105 lines
1.9 KiB
C
/*
|
|
* Copyright (c) 2018 Intel corporation
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include <kernel.h>
|
|
#include <kernel_structs.h>
|
|
#include <spinlock.h>
|
|
#include <kswap.h>
|
|
#include <kernel_internal.h>
|
|
|
|
#ifdef CONFIG_SMP
|
|
static atomic_t global_lock;
|
|
static atomic_t start_flag;
|
|
|
|
unsigned int z_smp_global_lock(void)
|
|
{
|
|
unsigned int key = arch_irq_lock();
|
|
|
|
if (!_current->base.global_lock_count) {
|
|
while (!atomic_cas(&global_lock, 0, 1)) {
|
|
}
|
|
}
|
|
|
|
_current->base.global_lock_count++;
|
|
|
|
return key;
|
|
}
|
|
|
|
void z_smp_global_unlock(unsigned int key)
|
|
{
|
|
if (_current->base.global_lock_count) {
|
|
_current->base.global_lock_count--;
|
|
|
|
if (!_current->base.global_lock_count) {
|
|
atomic_clear(&global_lock);
|
|
}
|
|
}
|
|
|
|
arch_irq_unlock(key);
|
|
}
|
|
|
|
void z_smp_reacquire_global_lock(struct k_thread *thread)
|
|
{
|
|
if (thread->base.global_lock_count) {
|
|
arch_irq_lock();
|
|
|
|
while (!atomic_cas(&global_lock, 0, 1)) {
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/* Called from within z_swap(), so assumes lock already held */
|
|
void z_smp_release_global_lock(struct k_thread *thread)
|
|
{
|
|
if (!thread->base.global_lock_count) {
|
|
atomic_clear(&global_lock);
|
|
}
|
|
}
|
|
|
|
#if CONFIG_MP_NUM_CPUS > 1
|
|
static FUNC_NORETURN void smp_init_top(void *arg)
|
|
{
|
|
atomic_t *start_flag = arg;
|
|
struct k_thread dummy_thread;
|
|
|
|
/* Wait for the signal to begin scheduling */
|
|
while (!atomic_get(start_flag)) {
|
|
}
|
|
|
|
z_dummy_thread_init(&dummy_thread);
|
|
smp_timer_init();
|
|
z_swap_unlocked();
|
|
|
|
CODE_UNREACHABLE;
|
|
}
|
|
#endif
|
|
|
|
void z_smp_init(void)
|
|
{
|
|
(void)atomic_clear(&start_flag);
|
|
|
|
#if defined(CONFIG_SMP) && (CONFIG_MP_NUM_CPUS > 1)
|
|
for (int i = 1; i < CONFIG_MP_NUM_CPUS; i++) {
|
|
arch_start_cpu(i, z_interrupt_stacks[i], CONFIG_ISR_STACK_SIZE,
|
|
smp_init_top, &start_flag);
|
|
}
|
|
#endif
|
|
|
|
(void)atomic_set(&start_flag, 1);
|
|
}
|
|
|
|
bool z_smp_cpu_mobile(void)
|
|
{
|
|
unsigned int k = arch_irq_lock();
|
|
bool pinned = arch_is_in_isr() || !arch_irq_unlocked(k);
|
|
|
|
arch_irq_unlock(k);
|
|
return !pinned;
|
|
}
|
|
|
|
#endif /* CONFIG_SMP */
|