Commit | Line | Data |
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1da177e4 | 1 | /* |
4baa9922 | 2 | * arch/arm/include/asm/mmu_context.h |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 1996 Russell King. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 as | |
8 | * published by the Free Software Foundation. | |
9 | * | |
10 | * Changelog: | |
11 | * 27-06-1996 RMK Created | |
12 | */ | |
13 | #ifndef __ASM_ARM_MMU_CONTEXT_H | |
14 | #define __ASM_ARM_MMU_CONTEXT_H | |
15 | ||
8dc39b88 | 16 | #include <linux/compiler.h> |
87c52578 | 17 | #include <linux/sched.h> |
4fe15ba0 | 18 | #include <asm/cacheflush.h> |
46097c7d | 19 | #include <asm/cachetype.h> |
1da177e4 | 20 | #include <asm/proc-fns.h> |
f9d4861f | 21 | #include <asm-generic/mm_hooks.h> |
1da177e4 | 22 | |
3e99675a | 23 | void __check_vmalloc_seq(struct mm_struct *mm); |
ff0daca5 | 24 | |
516793c6 | 25 | #ifdef CONFIG_CPU_HAS_ASID |
1da177e4 | 26 | |
b5466f87 | 27 | void check_and_switch_context(struct mm_struct *mm, struct task_struct *tsk); |
8a4e3a9e | 28 | #define init_new_context(tsk,mm) ({ atomic64_set(&mm->context.id, 0); 0; }) |
1da177e4 | 29 | |
93dc6887 CM |
30 | DECLARE_PER_CPU(atomic64_t, active_asids); |
31 | ||
7fec1b57 CM |
32 | #else /* !CONFIG_CPU_HAS_ASID */ |
33 | ||
b9d4d42a CM |
34 | #ifdef CONFIG_MMU |
35 | ||
7fec1b57 CM |
36 | static inline void check_and_switch_context(struct mm_struct *mm, |
37 | struct task_struct *tsk) | |
ff0daca5 | 38 | { |
3e99675a NP |
39 | if (unlikely(mm->context.vmalloc_seq != init_mm.context.vmalloc_seq)) |
40 | __check_vmalloc_seq(mm); | |
b9d4d42a CM |
41 | |
42 | if (irqs_disabled()) | |
43 | /* | |
44 | * cpu_switch_mm() needs to flush the VIVT caches. To avoid | |
45 | * high interrupt latencies, defer the call and continue | |
46 | * running with the old mm. Since we only support UP systems | |
47 | * on non-ASID CPUs, the old mm will remain valid until the | |
48 | * finish_arch_post_lock_switch() call. | |
49 | */ | |
50 | set_ti_thread_flag(task_thread_info(tsk), TIF_SWITCH_MM); | |
51 | else | |
52 | cpu_switch_mm(mm->pgd, mm); | |
ff0daca5 RK |
53 | } |
54 | ||
b9d4d42a CM |
55 | #define finish_arch_post_lock_switch \ |
56 | finish_arch_post_lock_switch | |
57 | static inline void finish_arch_post_lock_switch(void) | |
58 | { | |
59 | if (test_and_clear_thread_flag(TIF_SWITCH_MM)) { | |
60 | struct mm_struct *mm = current->mm; | |
61 | cpu_switch_mm(mm->pgd, mm); | |
62 | } | |
63 | } | |
1da177e4 | 64 | |
b9d4d42a CM |
65 | #endif /* CONFIG_MMU */ |
66 | ||
67 | #define init_new_context(tsk,mm) 0 | |
7fec1b57 CM |
68 | |
69 | #endif /* CONFIG_CPU_HAS_ASID */ | |
1da177e4 LT |
70 | |
71 | #define destroy_context(mm) do { } while(0) | |
b5466f87 | 72 | #define activate_mm(prev,next) switch_mm(prev, next, NULL) |
1da177e4 LT |
73 | |
74 | /* | |
75 | * This is called when "tsk" is about to enter lazy TLB mode. | |
76 | * | |
77 | * mm: describes the currently active mm context | |
78 | * tsk: task which is entering lazy tlb | |
79 | * cpu: cpu number which is entering lazy tlb | |
80 | * | |
81 | * tsk->mm will be NULL | |
82 | */ | |
83 | static inline void | |
84 | enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | |
85 | { | |
86 | } | |
87 | ||
88 | /* | |
89 | * This is the actual mm switch as far as the scheduler | |
90 | * is concerned. No registers are touched. We avoid | |
91 | * calling the CPU specific function when the mm hasn't | |
92 | * actually changed. | |
93 | */ | |
94 | static inline void | |
95 | switch_mm(struct mm_struct *prev, struct mm_struct *next, | |
96 | struct task_struct *tsk) | |
97 | { | |
002547b4 | 98 | #ifdef CONFIG_MMU |
1da177e4 LT |
99 | unsigned int cpu = smp_processor_id(); |
100 | ||
826cbdaf CM |
101 | #ifdef CONFIG_SMP |
102 | /* check for possible thread migration */ | |
56f8ba83 RR |
103 | if (!cpumask_empty(mm_cpumask(next)) && |
104 | !cpumask_test_cpu(cpu, mm_cpumask(next))) | |
826cbdaf CM |
105 | __flush_icache_all(); |
106 | #endif | |
56f8ba83 | 107 | if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)) || prev != next) { |
7fec1b57 | 108 | check_and_switch_context(next, tsk); |
7e5e6e9a | 109 | if (cache_is_vivt()) |
56f8ba83 | 110 | cpumask_clear_cpu(cpu, mm_cpumask(prev)); |
1da177e4 | 111 | } |
002547b4 | 112 | #endif |
1da177e4 LT |
113 | } |
114 | ||
115 | #define deactivate_mm(tsk,mm) do { } while (0) | |
1da177e4 LT |
116 | |
117 | #endif |