diff options
Diffstat (limited to 'include/asm-arm/mmu_context.h')
-rw-r--r-- | include/asm-arm/mmu_context.h | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/include/asm-arm/mmu_context.h b/include/asm-arm/mmu_context.h deleted file mode 100644 index 91b9dfdfed52..000000000000 --- a/include/asm-arm/mmu_context.h +++ /dev/null | |||
@@ -1,117 +0,0 @@ | |||
1 | /* | ||
2 | * linux/include/asm-arm/mmu_context.h | ||
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 | |||
16 | #include <linux/compiler.h> | ||
17 | #include <asm/cacheflush.h> | ||
18 | #include <asm/proc-fns.h> | ||
19 | #include <asm-generic/mm_hooks.h> | ||
20 | |||
21 | void __check_kvm_seq(struct mm_struct *mm); | ||
22 | |||
23 | #ifdef CONFIG_CPU_HAS_ASID | ||
24 | |||
25 | /* | ||
26 | * On ARMv6, we have the following structure in the Context ID: | ||
27 | * | ||
28 | * 31 7 0 | ||
29 | * +-------------------------+-----------+ | ||
30 | * | process ID | ASID | | ||
31 | * +-------------------------+-----------+ | ||
32 | * | context ID | | ||
33 | * +-------------------------------------+ | ||
34 | * | ||
35 | * The ASID is used to tag entries in the CPU caches and TLBs. | ||
36 | * The context ID is used by debuggers and trace logic, and | ||
37 | * should be unique within all running processes. | ||
38 | */ | ||
39 | #define ASID_BITS 8 | ||
40 | #define ASID_MASK ((~0) << ASID_BITS) | ||
41 | #define ASID_FIRST_VERSION (1 << ASID_BITS) | ||
42 | |||
43 | extern unsigned int cpu_last_asid; | ||
44 | |||
45 | void __init_new_context(struct task_struct *tsk, struct mm_struct *mm); | ||
46 | void __new_context(struct mm_struct *mm); | ||
47 | |||
48 | static inline void check_context(struct mm_struct *mm) | ||
49 | { | ||
50 | if (unlikely((mm->context.id ^ cpu_last_asid) >> ASID_BITS)) | ||
51 | __new_context(mm); | ||
52 | |||
53 | if (unlikely(mm->context.kvm_seq != init_mm.context.kvm_seq)) | ||
54 | __check_kvm_seq(mm); | ||
55 | } | ||
56 | |||
57 | #define init_new_context(tsk,mm) (__init_new_context(tsk,mm),0) | ||
58 | |||
59 | #else | ||
60 | |||
61 | static inline void check_context(struct mm_struct *mm) | ||
62 | { | ||
63 | if (unlikely(mm->context.kvm_seq != init_mm.context.kvm_seq)) | ||
64 | __check_kvm_seq(mm); | ||
65 | } | ||
66 | |||
67 | #define init_new_context(tsk,mm) 0 | ||
68 | |||
69 | #endif | ||
70 | |||
71 | #define destroy_context(mm) do { } while(0) | ||
72 | |||
73 | /* | ||
74 | * This is called when "tsk" is about to enter lazy TLB mode. | ||
75 | * | ||
76 | * mm: describes the currently active mm context | ||
77 | * tsk: task which is entering lazy tlb | ||
78 | * cpu: cpu number which is entering lazy tlb | ||
79 | * | ||
80 | * tsk->mm will be NULL | ||
81 | */ | ||
82 | static inline void | ||
83 | enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk) | ||
84 | { | ||
85 | } | ||
86 | |||
87 | /* | ||
88 | * This is the actual mm switch as far as the scheduler | ||
89 | * is concerned. No registers are touched. We avoid | ||
90 | * calling the CPU specific function when the mm hasn't | ||
91 | * actually changed. | ||
92 | */ | ||
93 | static inline void | ||
94 | switch_mm(struct mm_struct *prev, struct mm_struct *next, | ||
95 | struct task_struct *tsk) | ||
96 | { | ||
97 | #ifdef CONFIG_MMU | ||
98 | unsigned int cpu = smp_processor_id(); | ||
99 | |||
100 | #ifdef CONFIG_SMP | ||
101 | /* check for possible thread migration */ | ||
102 | if (!cpus_empty(next->cpu_vm_mask) && !cpu_isset(cpu, next->cpu_vm_mask)) | ||
103 | __flush_icache_all(); | ||
104 | #endif | ||
105 | if (!cpu_test_and_set(cpu, next->cpu_vm_mask) || prev != next) { | ||
106 | check_context(next); | ||
107 | cpu_switch_mm(next->pgd, next); | ||
108 | if (cache_is_vivt()) | ||
109 | cpu_clear(cpu, prev->cpu_vm_mask); | ||
110 | } | ||
111 | #endif | ||
112 | } | ||
113 | |||
114 | #define deactivate_mm(tsk,mm) do { } while (0) | ||
115 | #define activate_mm(prev,next) switch_mm(prev, next, NULL) | ||
116 | |||
117 | #endif | ||