1 #ifndef __ASM_POWERPC_MMU_CONTEXT_H
2 #define __ASM_POWERPC_MMU_CONTEXT_H
6 #include <asm-ppc/mmu_context.h>
9 #include <linux/kernel.h>
11 #include <linux/sched.h>
13 #include <asm/cputable.h>
14 #include <asm-generic/mm_hooks.h>
17 * Copyright (C) 2001 PPC 64 Team, IBM Corp
19 * This program is free software; you can redistribute it and/or
20 * modify it under the terms of the GNU General Public License
21 * as published by the Free Software Foundation; either version
22 * 2 of the License, or (at your option) any later version.
25 static inline void enter_lazy_tlb(struct mm_struct *mm,
26 struct task_struct *tsk)
31 * The proto-VSID space has 2^35 - 1 segments available for user mappings.
32 * Each segment contains 2^28 bytes. Each context maps 2^44 bytes,
33 * so we can support 2^19-1 contexts (19 == 35 + 28 - 44).
36 #define MAX_CONTEXT ((1UL << 19) - 1)
38 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
39 extern void destroy_context(struct mm_struct *mm);
41 extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
42 extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
45 * switch_mm is the entry point called from the architecture independent
46 * code in kernel/sched.c
48 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
49 struct task_struct *tsk)
51 if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
52 cpu_set(smp_processor_id(), next->cpu_vm_mask);
54 /* No need to flush userspace segments if the mm doesnt change */
59 if (cpu_has_feature(CPU_FTR_ALTIVEC))
60 asm volatile ("dssall");
61 #endif /* CONFIG_ALTIVEC */
63 if (cpu_has_feature(CPU_FTR_SLB))
64 switch_slb(tsk, next);
66 switch_stab(tsk, next);
69 #define deactivate_mm(tsk,mm) do { } while (0)
72 * After we have set current->mm to a new value, this activates
73 * the context for the new mm so we see the new mappings.
75 static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
79 local_irq_save(flags);
80 switch_mm(prev, next, current);
81 local_irq_restore(flags);
84 #endif /* CONFIG_PPC64 */
85 #endif /* __KERNEL__ */
86 #endif /* __ASM_POWERPC_MMU_CONTEXT_H */