| /* |
| * Copyright (c) 2010-2015 Wind River Systems, Inc. |
| * Copyright (c) 2017 Oticon A/S |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| /** |
| * @file |
| * @brief Kernel swapper code for POSIX |
| * |
| * This module implements the arch_swap() routine for the POSIX architecture. |
| * |
| */ |
| |
| #include <zephyr/kernel.h> |
| #include <zephyr/kernel_structs.h> |
| #include "posix_core.h" |
| #include <zephyr/irq.h> |
| #include "kswap.h" |
| #include <zephyr/pm/pm.h> |
| |
| int arch_swap(unsigned int key) |
| { |
| /* |
| * struct k_thread * _current is the currently running thread |
| * struct k_thread * _kernel.ready_q.cache contains the next thread to |
| * run (cannot be NULL) |
| * |
| * Here a "real" arch would save all processor registers, stack pointer |
| * and so forth. But we do not need to do so because we use posix |
| * threads => those are all nicely kept by the native OS kernel |
| */ |
| #if CONFIG_INSTRUMENT_THREAD_SWITCHING |
| z_thread_mark_switched_out(); |
| #endif |
| _current->callee_saved.key = key; |
| _current->callee_saved.retval = -EAGAIN; |
| |
| /* retval may be modified with a call to |
| * arch_thread_return_value_set() |
| */ |
| |
| posix_thread_status_t *ready_thread_ptr = |
| (posix_thread_status_t *) |
| _kernel.ready_q.cache->callee_saved.thread_status; |
| |
| posix_thread_status_t *this_thread_ptr = |
| (posix_thread_status_t *) |
| _current->callee_saved.thread_status; |
| |
| |
| _current = _kernel.ready_q.cache; |
| #if CONFIG_INSTRUMENT_THREAD_SWITCHING |
| z_thread_mark_switched_in(); |
| #endif |
| |
| /* |
| * Here a "real" arch would load all processor registers for the thread |
| * to run. In this arch case, we just block this thread until allowed |
| * to run later, and signal to whomever is allowed to run to |
| * continue. |
| */ |
| posix_swap(ready_thread_ptr->thread_idx, |
| this_thread_ptr->thread_idx); |
| |
| /* When we continue, _kernel->current points back to this thread */ |
| |
| irq_unlock(_current->callee_saved.key); |
| |
| return _current->callee_saved.retval; |
| } |
| |
| |
| |
| #ifdef CONFIG_ARCH_HAS_CUSTOM_SWAP_TO_MAIN |
| /* This is just a version of arch_swap() in which we do not save anything |
| * about the current thread. |
| * |
| * Note that we will never come back to this thread: posix_main_thread_start() |
| * does never return. |
| */ |
| void arch_switch_to_main_thread(struct k_thread *main_thread, char *stack_ptr, |
| k_thread_entry_t _main) |
| { |
| ARG_UNUSED(stack_ptr); |
| ARG_UNUSED(_main); |
| |
| posix_thread_status_t *ready_thread_ptr = |
| (posix_thread_status_t *) |
| _kernel.ready_q.cache->callee_saved.thread_status; |
| |
| #ifdef CONFIG_INSTRUMENT_THREAD_SWITCHING |
| z_thread_mark_switched_out(); |
| #endif |
| |
| _current = _kernel.ready_q.cache; |
| |
| #ifdef CONFIG_INSTRUMENT_THREAD_SWITCHING |
| z_thread_mark_switched_in(); |
| #endif |
| |
| posix_main_thread_start(ready_thread_ptr->thread_idx); |
| } /* LCOV_EXCL_LINE */ |
| #endif |
| |
| #ifdef CONFIG_PM |
| /** |
| * If the kernel is in idle mode, take it out |
| */ |
| void posix_irq_check_idle_exit(void) |
| { |
| if (_kernel.idle) { |
| _kernel.idle = 0; |
| z_pm_save_idle_exit(); |
| } |
| } |
| #endif |