include/asm-powerpc/mmu_context.h

   1 #ifndef __ASM_POWERPC_MMU_CONTEXT_H
   2 #define __ASM_POWERPC_MMU_CONTEXT_H
   3 #ifdef __KERNEL__
   4
   5 #ifndef CONFIG_PPC64
   6 #include <asm-ppc/mmu_context.h>
   7 #else
   8
   9 #include <linux/kernel.h>
  10 #include <linux/mm.h>
  11 #include <asm/mmu.h>
  12 #include <asm/cputable.h>
  13
  14 /*
  15  * Copyright (C) 2001 PPC 64 Team, IBM Corp
  16  *
  17  * This program is free software; you can redistribute it and/or
  18  * modify it under the terms of the GNU General Public License
  19  * as published by the Free Software Foundation; either version
  20  * 2 of the License, or (at your option) any later version.
  21  */
  22
  23 static inline void enter_lazy_tlb(struct mm_struct *mm,
  24                                   struct task_struct *tsk)
  25 {
  26 }
  27
  28 #define NO_CONTEXT      0
  29 #define MAX_CONTEXT     (0x100000-1)
  30
  31 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
  32 extern void destroy_context(struct mm_struct *mm);
  33
  34 extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
  35 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
  36
  37 /*
  38  * switch_mm is the entry point called from the architecture independent
  39  * code in kernel/sched.c
  40  */
  41 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  42                              struct task_struct *tsk)
  43 {
  44         if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
  45                 cpu_set(smp_processor_id(), next->cpu_vm_mask);
  46
  47         /* No need to flush userspace segments if the mm doesnt change */
  48         if (prev == next)
  49                 return;
  50
  51 #ifdef CONFIG_ALTIVEC
  52         if (cpu_has_feature(CPU_FTR_ALTIVEC))
  53                 asm volatile ("dssall");
  54 #endif /* CONFIG_ALTIVEC */
  55
  56         if (cpu_has_feature(CPU_FTR_SLB))
  57                 switch_slb(tsk, next);
  58         else
  59                 switch_stab(tsk, next);
  60 }
  61
  62 #define deactivate_mm(tsk,mm)   do { } while (0)
  63
  64 /*
  65  * After we have set current->mm to a new value, this activates
  66  * the context for the new mm so we see the new mappings.
  67  */
  68 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
  69 {
  70         unsigned long flags;
  71
  72         local_irq_save(flags);
  73         switch_mm(prev, next, current);
  74         local_irq_restore(flags);
  75 }
  76
  77 #endif /* CONFIG_PPC64 */
  78 #endif /* __KERNEL__ */
  79 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */