mirror of https://gitee.com/openkylin/linux.git
80 lines
2.9 KiB
C
80 lines
2.9 KiB
C
/*
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* Copyright 2010 Tilera Corporation. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation, version 2.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for
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* more details.
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*/
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#ifndef _ASM_TILE_SWITCH_TO_H
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#define _ASM_TILE_SWITCH_TO_H
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#include <arch/sim_def.h>
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/*
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* switch_to(n) should switch tasks to task nr n, first
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* checking that n isn't the current task, in which case it does nothing.
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* The number of callee-saved registers saved on the kernel stack
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* is defined here for use in copy_thread() and must agree with __switch_to().
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*/
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#define CALLEE_SAVED_FIRST_REG 30
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#define CALLEE_SAVED_REGS_COUNT 24 /* r30 to r52, plus an empty to align */
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#ifndef __ASSEMBLY__
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struct task_struct;
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/*
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* Pause the DMA engine and static network before task switching.
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*/
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#define prepare_arch_switch(next) _prepare_arch_switch(next)
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void _prepare_arch_switch(struct task_struct *next);
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struct task_struct;
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#define switch_to(prev, next, last) ((last) = _switch_to((prev), (next)))
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extern struct task_struct *_switch_to(struct task_struct *prev,
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struct task_struct *next);
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/* Helper function for _switch_to(). */
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extern struct task_struct *__switch_to(struct task_struct *prev,
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struct task_struct *next,
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unsigned long new_system_save_k_0);
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/* Address that switched-away from tasks are at. */
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extern unsigned long get_switch_to_pc(void);
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/*
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* Kernel threads can check to see if they need to migrate their
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* stack whenever they return from a context switch; for user
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* threads, we defer until they are returning to user-space.
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*/
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#define finish_arch_switch(prev) do { \
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if (unlikely((prev)->state == TASK_DEAD)) \
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__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_EXIT | \
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((prev)->pid << _SIM_CONTROL_OPERATOR_BITS)); \
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__insn_mtspr(SPR_SIM_CONTROL, SIM_CONTROL_OS_SWITCH | \
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(current->pid << _SIM_CONTROL_OPERATOR_BITS)); \
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if (current->mm == NULL && !kstack_hash && \
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current_thread_info()->homecache_cpu != smp_processor_id()) \
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homecache_migrate_kthread(); \
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} while (0)
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/* Support function for forking a new task. */
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void ret_from_fork(void);
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/* Support function for forking a new kernel thread. */
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void ret_from_kernel_thread(void *fn, void *arg);
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/* Called from ret_from_xxx() when a new process starts up. */
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struct task_struct *sim_notify_fork(struct task_struct *prev);
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_TILE_SWITCH_TO_H */
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