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Linux/arch/m32r/include/asm/mmu_context.h

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  1 #ifndef _ASM_M32R_MMU_CONTEXT_H
  2 #define _ASM_M32R_MMU_CONTEXT_H
  3 #ifdef __KERNEL__
  4 
  5 #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 
 12 #ifndef __ASSEMBLY__
 13 
 14 #include <linux/atomic.h>
 15 #include <asm/pgalloc.h>
 16 #include <asm/mmu.h>
 17 #include <asm/tlbflush.h>
 18 #include <asm-generic/mm_hooks.h>
 19 
 20 /*
 21  * Cache of MMU context last used.
 22  */
 23 #ifndef CONFIG_SMP
 24 extern 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 */
 28 extern 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 
 39 static 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 distinguish 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  */
 58 static 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  */
 74 static 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 
 96 static inline void set_asid(unsigned long asid)
 97 {
 98         *(volatile unsigned long *)MASID = (asid & MMU_CONTEXT_ASID_MASK);
 99 }
100 
101 static 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  */
115 static 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 
121 static 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
130                 cpumask_set_cpu(cpu, mm_cpumask(next));
131 #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
138                 if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next)))
139                         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 
148 #else /* not CONFIG_MMU */
149 #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)
159 #endif /* not CONFIG_MMU */
160 
161 #endif /* not __ASSEMBLY__ */
162 
163 #endif /* __KERNEL__ */
164 #endif /* _ASM_M32R_MMU_CONTEXT_H */
165 

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