88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
#ifndef __PPC64_MMU_CONTEXT_H
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#define __PPC64_MMU_CONTEXT_H
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <asm/mmu.h>
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#include <asm/cputable.h>
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/*
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* Copyright (C) 2001 PPC 64 Team, IBM Corp
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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; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/*
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* Every architecture must define this function. It's the fastest
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* way of searching a 140-bit bitmap where the first 100 bits are
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* unlikely to be set. It's guaranteed that at least one of the 140
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* bits is cleared.
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*/
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static inline int sched_find_first_bit(unsigned long *b)
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{
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if (unlikely(b[0]))
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return __ffs(b[0]);
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if (unlikely(b[1]))
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return __ffs(b[1]) + 64;
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return __ffs(b[2]) + 128;
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}
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static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
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{
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}
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#define NO_CONTEXT 0
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#define MAX_CONTEXT (0x100000-1)
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extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
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extern void destroy_context(struct mm_struct *mm);
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extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
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extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
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/*
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* switch_mm is the entry point called from the architecture independent
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* code in kernel/sched.c
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*/
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static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
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struct task_struct *tsk)
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{
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if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
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cpu_set(smp_processor_id(), next->cpu_vm_mask);
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/* No need to flush userspace segments if the mm doesnt change */
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if (prev == next)
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return;
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#ifdef CONFIG_ALTIVEC
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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asm volatile ("dssall");
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#endif /* CONFIG_ALTIVEC */
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if (cpu_has_feature(CPU_FTR_SLB))
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switch_slb(tsk, next);
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else
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switch_stab(tsk, next);
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}
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#define deactivate_mm(tsk,mm) do { } while (0)
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/*
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* After we have set current->mm to a new value, this activates
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* the context for the new mm so we see the new mappings.
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*/
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static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
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{
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unsigned long flags;
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local_irq_save(flags);
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switch_mm(prev, next, current);
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local_irq_restore(flags);
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}
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#endif /* __PPC64_MMU_CONTEXT_H */
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