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