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 <linux/sched.h>
12#include <asm/mmu.h>
13#include <asm/cputable.h>
14#include <asm-generic/mm_hooks.h>
15
16/*
17 * Copyright (C) 2001 PPC 64 Team, IBM Corp
18 *
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.
23 */
24
25static inline void enter_lazy_tlb(struct mm_struct *mm,
26				  struct task_struct *tsk)
27{
28}
29
30/*
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).
34 */
35#define NO_CONTEXT	0
36#define MAX_CONTEXT	((1UL << 19) - 1)
37
38extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
39extern void destroy_context(struct mm_struct *mm);
40
41extern void switch_stab(struct task_struct *tsk, struct mm_struct *mm);
42extern void switch_slb(struct task_struct *tsk, struct mm_struct *mm);
43
44/*
45 * switch_mm is the entry point called from the architecture independent
46 * code in kernel/sched.c
47 */
48static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
49			     struct task_struct *tsk)
50{
51	if (!cpu_isset(smp_processor_id(), next->cpu_vm_mask))
52		cpu_set(smp_processor_id(), next->cpu_vm_mask);
53
54	/* No need to flush userspace segments if the mm doesnt change */
55	if (prev == next)
56		return;
57
58#ifdef CONFIG_ALTIVEC
59	if (cpu_has_feature(CPU_FTR_ALTIVEC))
60		asm volatile ("dssall");
61#endif /* CONFIG_ALTIVEC */
62
63	if (cpu_has_feature(CPU_FTR_SLB))
64		switch_slb(tsk, next);
65	else
66		switch_stab(tsk, next);
67}
68
69#define deactivate_mm(tsk,mm)	do { } while (0)
70
71/*
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.
74 */
75static inline void activate_mm(struct mm_struct *prev, struct mm_struct *next)
76{
77	unsigned long flags;
78
79	local_irq_save(flags);
80	switch_mm(prev, next, current);
81	local_irq_restore(flags);
82}
83
84#endif /* CONFIG_PPC64 */
85#endif /* __KERNEL__ */
86#endif /* __ASM_POWERPC_MMU_CONTEXT_H */
87