90 lines
2.3 KiB
C
90 lines
2.3 KiB
C
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#ifndef __ASM_POWERPC_MMU_CONTEXT_H
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#define __ASM_POWERPC_MMU_CONTEXT_H
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#ifndef CONFIG_PPC64
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#include <asm-ppc/mmu_context.h>
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#else
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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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* Getting into a kernel thread, there is no valid user segment, mark
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* paca->pgdir NULL so that SLB miss on user addresses will fault
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*/
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static inline void enter_lazy_tlb(struct mm_struct *mm,
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struct task_struct *tsk)
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{
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#ifdef CONFIG_PPC_64K_PAGES
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get_paca()->pgdir = NULL;
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#endif /* CONFIG_PPC_64K_PAGES */
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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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#ifdef CONFIG_PPC_64K_PAGES
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if (prev == next && get_paca()->pgdir == next->pgd)
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return;
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#else
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if (prev == next)
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return;
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#endif /* CONFIG_PPC_64K_PAGES */
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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 /* CONFIG_PPC64 */
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#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
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