88 lines
2.7 KiB
C
88 lines
2.7 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 95, 96, 97, 98, 99, 2003, 06 by Ralf Baechle
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* Copyright (C) 1996 by Paul M. Antoine
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* Copyright (C) 1999 Silicon Graphics
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* Kevin D. Kissell, kevink@mips.org and Carsten Langgaard, carstenl@mips.com
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* Copyright (C) 2000 MIPS Technologies, Inc.
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*/
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#ifndef _ASM_SWITCH_TO_H
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#define _ASM_SWITCH_TO_H
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#include <asm/cpu-features.h>
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#include <asm/watch.h>
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#include <asm/dsp.h>
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struct task_struct;
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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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*/
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extern asmlinkage void *resume(void *last, void *next, void *next_ti, u32 __usedfpu);
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extern unsigned int ll_bit;
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extern struct task_struct *ll_task;
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#ifdef CONFIG_MIPS_MT_FPAFF
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/*
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* Handle the scheduler resume end of FPU affinity management. We do this
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* inline to try to keep the overhead down. If we have been forced to run on
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* a "CPU" with an FPU because of a previous high level of FP computation,
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* but did not actually use the FPU during the most recent time-slice (CU1
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* isn't set), we undo the restriction on cpus_allowed.
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*
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* We're not calling set_cpus_allowed() here, because we have no need to
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* force prompt migration - we're already switching the current CPU to a
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* different thread.
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*/
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#define __mips_mt_fpaff_switch_to(prev) \
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do { \
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struct thread_info *__prev_ti = task_thread_info(prev); \
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\
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if (cpu_has_fpu && \
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test_ti_thread_flag(__prev_ti, TIF_FPUBOUND) && \
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(!(KSTK_STATUS(prev) & ST0_CU1))) { \
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clear_ti_thread_flag(__prev_ti, TIF_FPUBOUND); \
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prev->cpus_allowed = prev->thread.user_cpus_allowed; \
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} \
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next->thread.emulated_fp = 0; \
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} while(0)
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#else
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#define __mips_mt_fpaff_switch_to(prev) do { (void) (prev); } while (0)
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#endif
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#define __clear_software_ll_bit() \
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do { \
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if (!__builtin_constant_p(cpu_has_llsc) || !cpu_has_llsc) \
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ll_bit = 0; \
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} while (0)
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#define switch_to(prev, next, last) \
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do { \
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u32 __usedfpu; \
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__mips_mt_fpaff_switch_to(prev); \
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if (cpu_has_dsp) \
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__save_dsp(prev); \
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__clear_software_ll_bit(); \
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__usedfpu = test_and_clear_tsk_thread_flag(prev, TIF_USEDFPU); \
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(last) = resume(prev, next, task_thread_info(next), __usedfpu); \
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} while (0)
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#define finish_arch_switch(prev) \
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do { \
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if (cpu_has_dsp) \
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__restore_dsp(current); \
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if (cpu_has_userlocal) \
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write_c0_userlocal(current_thread_info()->tp_value); \
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__restore_watch(); \
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} while (0)
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#endif /* _ASM_SWITCH_TO_H */
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