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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2013 Google, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef THREAD_H_
#define THREAD_H_
#include <stddef.h>
#include <stdint.h>
#include <bootstate.h>
#include <timer.h>
#include <arch/cpu.h>
#if IS_ENABLED(CONFIG_COOP_MULTITASKING) && !defined(__SMM__) && !defined(__PRE_RAM__)
struct thread {
int id;
uintptr_t stack_current;
uintptr_t stack_orig;
struct thread *next;
void (*entry)(void *);
void *entry_arg;
int can_yield;
};
void threads_initialize(void);
/* Get the base of the thread stacks.
* Returns pointer to CONFIG_NUM_THREADS*CONFIG_STACK_SIZE contiguous bytes
* aligned to CONFIG_STACK_SIZE, or NULL.
*/
void *arch_get_thread_stackbase(void);
/* Run func(arrg) on a new thread. Return 0 on successful start of thread, < 0
* when thread could not be started. Note that the thread will block the
* current state in the boot state machine until it is complete. */
int thread_run(void (*func)(void *), void *arg);
/* thread_run_until is the same as thread_run() except that it blocks state
* transitions from occurring in the (state, seq) pair of the boot state
* machine. */
int thread_run_until(void (*func)(void *), void *arg,
boot_state_t state, boot_state_sequence_t seq);
/* Return 0 on successful yield for the given amount of time, < 0 when thread
* did not yield. */
int thread_yield_microseconds(unsigned int microsecs);
/* Allow and prevent thread cooperation on current running thread. By default
* all threads are marked to be cooperative. That means a thread can yield
* to another thread at a pre-determined switch point. Current there is
* only a single place where switching may occur: a call to udelay(). */
void thread_cooperate(void);
void thread_prevent_coop(void);
static inline void thread_init_cpu_info_non_bsp(struct cpu_info *ci)
{
ci->thread = NULL;
}
/* Architecture specific thread functions. */
asmlinkage void switch_to_thread(uintptr_t new_stack, uintptr_t *saved_stack);
/* Set up the stack frame for a new thread so that a switch_to_thread() call
* will enter the thread_entry() function with arg as a parameter. The
* saved_stack field in the struct thread needs to be updated accordingly. */
void arch_prepare_thread(struct thread *t,
asmlinkage void (*thread_entry)(void *), void *arg);
#else
static inline void threads_initialize(void) {}
static inline int thread_run(void (*func)(void *), void *arg) { return -1; }
static inline int thread_yield_microseconds(unsigned int microsecs)
{
return -1;
}
static inline void thread_cooperate(void) {}
static inline void thread_prevent_coop(void) {}
struct cpu_info;
static inline void thread_init_cpu_info_non_bsp(struct cpu_info *ci) { }
#endif
#endif /* THREAD_H_ */
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