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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ASM_M32R_MMU_CONTEXT_H
2#define _ASM_M32R_MMU_CONTEXT_H
Linus Torvalds1da177e2005-04-16 15:20:36 -07003#ifdef __KERNEL__
4
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <asm/m32r.h>
6
7#define MMU_CONTEXT_ASID_MASK (0x000000FF)
8#define MMU_CONTEXT_VERSION_MASK (0xFFFFFF00)
9#define MMU_CONTEXT_FIRST_VERSION (0x00000100)
10#define NO_CONTEXT (0x00000000)
11
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#ifndef __ASSEMBLY__
13
Arun Sharma600634972011-07-26 16:09:06 -070014#include <linux/atomic.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <asm/pgalloc.h>
16#include <asm/mmu.h>
17#include <asm/tlbflush.h>
Jeremy Fitzhardinged6dd61c2007-05-02 19:27:14 +020018#include <asm-generic/mm_hooks.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
20/*
21 * Cache of MMU context last used.
22 */
23#ifndef CONFIG_SMP
24extern unsigned long mmu_context_cache_dat;
25#define mmu_context_cache mmu_context_cache_dat
26#define mm_context(mm) mm->context
27#else /* not CONFIG_SMP */
28extern unsigned long mmu_context_cache_dat[];
29#define mmu_context_cache mmu_context_cache_dat[smp_processor_id()]
30#define mm_context(mm) mm->context[smp_processor_id()]
31#endif /* not CONFIG_SMP */
32
33#define set_tlb_tag(entry, tag) (*entry = (tag & PAGE_MASK)|get_asid())
34#define set_tlb_data(entry, data) (*entry = (data | _PAGE_PRESENT))
35
36#ifdef CONFIG_MMU
37#define enter_lazy_tlb(mm, tsk) do { } while (0)
38
39static inline void get_new_mmu_context(struct mm_struct *mm)
40{
41 unsigned long mc = ++mmu_context_cache;
42
43 if (!(mc & MMU_CONTEXT_ASID_MASK)) {
44 /* We exhaust ASID of this version.
45 Flush all TLB and start new cycle. */
46 local_flush_tlb_all();
47 /* Fix version if needed.
48 Note that we avoid version #0 to distingush NO_CONTEXT. */
49 if (!mc)
50 mmu_context_cache = mc = MMU_CONTEXT_FIRST_VERSION;
51 }
52 mm_context(mm) = mc;
53}
54
55/*
56 * Get MMU context if needed.
57 */
58static inline void get_mmu_context(struct mm_struct *mm)
59{
60 if (mm) {
61 unsigned long mc = mmu_context_cache;
62
63 /* Check if we have old version of context.
64 If it's old, we need to get new context with new version. */
65 if ((mm_context(mm) ^ mc) & MMU_CONTEXT_VERSION_MASK)
66 get_new_mmu_context(mm);
67 }
68}
69
70/*
71 * Initialize the context related info for a new mm_struct
72 * instance.
73 */
74static inline int init_new_context(struct task_struct *tsk,
75 struct mm_struct *mm)
76{
77#ifndef CONFIG_SMP
78 mm->context = NO_CONTEXT;
79#else /* CONFIG_SMP */
80 int num_cpus = num_online_cpus();
81 int i;
82
83 for (i = 0 ; i < num_cpus ; i++)
84 mm->context[i] = NO_CONTEXT;
85#endif /* CONFIG_SMP */
86
87 return 0;
88}
89
90/*
91 * Destroy context related info for an mm_struct that is about
92 * to be put to rest.
93 */
94#define destroy_context(mm) do { } while (0)
95
96static inline void set_asid(unsigned long asid)
97{
98 *(volatile unsigned long *)MASID = (asid & MMU_CONTEXT_ASID_MASK);
99}
100
101static inline unsigned long get_asid(void)
102{
103 unsigned long asid;
104
105 asid = *(volatile long *)MASID;
106 asid &= MMU_CONTEXT_ASID_MASK;
107
108 return asid;
109}
110
111/*
112 * After we have set current->mm to a new value, this activates
113 * the context for the new mm so we see the new mappings.
114 */
115static inline void activate_context(struct mm_struct *mm)
116{
117 get_mmu_context(mm);
118 set_asid(mm_context(mm) & MMU_CONTEXT_ASID_MASK);
119}
120
121static inline void switch_mm(struct mm_struct *prev,
122 struct mm_struct *next, struct task_struct *tsk)
123{
124#ifdef CONFIG_SMP
125 int cpu = smp_processor_id();
126#endif /* CONFIG_SMP */
127
128 if (prev != next) {
129#ifdef CONFIG_SMP
Rusty Russell49b92052009-09-24 09:34:49 -0600130 cpumask_set_cpu(cpu, mm_cpumask(next));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131#endif /* CONFIG_SMP */
132 /* Set MPTB = next->pgd */
133 *(volatile unsigned long *)MPTB = (unsigned long)next->pgd;
134 activate_context(next);
135 }
136#ifdef CONFIG_SMP
137 else
Rusty Russell49b92052009-09-24 09:34:49 -0600138 if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 activate_context(next);
140#endif /* CONFIG_SMP */
141}
142
143#define deactivate_mm(tsk, mm) do { } while (0)
144
145#define activate_mm(prev, next) \
146 switch_mm((prev), (next), NULL)
147
Hirokazu Takatafabb6262007-02-10 01:43:40 -0800148#else /* not CONFIG_MMU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149#define get_mmu_context(mm) do { } while (0)
150#define init_new_context(tsk,mm) (0)
151#define destroy_context(mm) do { } while (0)
152#define set_asid(asid) do { } while (0)
153#define get_asid() (0)
154#define activate_context(mm) do { } while (0)
155#define switch_mm(prev,next,tsk) do { } while (0)
156#define deactivate_mm(mm,tsk) do { } while (0)
157#define activate_mm(prev,next) do { } while (0)
158#define enter_lazy_tlb(mm,tsk) do { } while (0)
Hirokazu Takatafabb6262007-02-10 01:43:40 -0800159#endif /* not CONFIG_MMU */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
161#endif /* not __ASSEMBLY__ */
162
163#endif /* __KERNEL__ */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164#endif /* _ASM_M32R_MMU_CONTEXT_H */