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77 lines
2.7 KiB
77 lines
2.7 KiB
/* |
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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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* We defer homecache migration until the runqueue lock is released. |
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*/ |
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#define finish_arch_post_lock_switch() do { \ |
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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 != raw_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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