release/src-rt-6.x.4708/linux/linux-2.6.36/arch/m68k/include/asm/mmu_context.h

   1 #ifndef __M68K_MMU_CONTEXT_H
   2 #define __M68K_MMU_CONTEXT_H
   3
   4 #include <asm-generic/mm_hooks.h>
   5
   6 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
   7 {
   8 }
   9
  10 #ifdef CONFIG_MMU
  11 #ifndef CONFIG_SUN3
  12
  13 #include <asm/setup.h>
  14 #include <asm/page.h>
  15 #include <asm/pgalloc.h>
  16
  17 static inline int init_new_context(struct task_struct *tsk,
  18                                    struct mm_struct *mm)
  19 {
  20         mm->context = virt_to_phys(mm->pgd);
  21         return 0;
  22 }
  23
  24 #define destroy_context(mm)             do { } while(0)
  25
  26 static inline void switch_mm_0230(struct mm_struct *mm)
  27 {
  28         unsigned long crp[2] = {
  29                 0x80000000 | _PAGE_TABLE, mm->context
  30         };
  31         unsigned long tmp;
  32
  33         asm volatile (".chip 68030");
  34
  35         /* flush MC68030/MC68020 caches (they are virtually addressed) */
  36         asm volatile (
  37                 "movec %%cacr,%0;"
  38                 "orw %1,%0; "
  39                 "movec %0,%%cacr"
  40                 : "=d" (tmp) : "di" (FLUSH_I_AND_D));
  41
  42         /* Switch the root pointer. For a 030-only kernel,
  43          * avoid flushing the whole ATC, we only need to
  44          * flush the user entries. The 68851 does this by
  45          * itself. Avoid a runtime check here.
  46          */
  47         asm volatile (
  48 #ifdef CPU_M68030_ONLY
  49                 "pmovefd %0,%%crp; "
  50                 "pflush #0,#4"
  51 #else
  52                 "pmove %0,%%crp"
  53 #endif
  54                 : : "m" (crp[0]));
  55
  56         asm volatile (".chip 68k");
  57 }
  58
  59 static inline void switch_mm_0460(struct mm_struct *mm)
  60 {
  61         asm volatile (".chip 68040");
  62
  63         /* flush address translation cache (user entries) */
  64         asm volatile ("pflushan");
  65
  66         /* switch the root pointer */
  67         asm volatile ("movec %0,%%urp" : : "r" (mm->context));
  68
  69         if (CPU_IS_060) {
  70                 unsigned long tmp;
  71
  72                 /* clear user entries in the branch cache */
  73                 asm volatile (
  74                         "movec %%cacr,%0; "
  75                         "orl %1,%0; "
  76                         "movec %0,%%cacr"
  77                         : "=d" (tmp): "di" (0x00200000));
  78         }
  79
  80         asm volatile (".chip 68k");
  81 }
  82
  83 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
  84 {
  85         if (prev != next) {
  86                 if (CPU_IS_020_OR_030)
  87                         switch_mm_0230(next);
  88                 else
  89                         switch_mm_0460(next);
  90         }
  91 }
  92
  93 #define deactivate_mm(tsk,mm)   do { } while (0)
  94
  95 static inline void activate_mm(struct mm_struct *prev_mm,
  96                                struct mm_struct *next_mm)
  97 {
  98         next_mm->context = virt_to_phys(next_mm->pgd);
  99
 100         if (CPU_IS_020_OR_030)
 101                 switch_mm_0230(next_mm);
 102         else
 103                 switch_mm_0460(next_mm);
 104 }
 105
 106 #else  /* CONFIG_SUN3 */
 107 #include <asm/sun3mmu.h>
 108 #include <linux/sched.h>
 109
 110 extern unsigned long get_free_context(struct mm_struct *mm);
 111 extern void clear_context(unsigned long context);
 112
 113 /* set the context for a new task to unmapped */
 114 static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 115 {
 116         mm->context = SUN3_INVALID_CONTEXT;
 117         return 0;
 118 }
 119
 120 /* find the context given to this process, and if it hasn't already
 121    got one, go get one for it. */
 122 static inline void get_mmu_context(struct mm_struct *mm)
 123 {
 124         if(mm->context == SUN3_INVALID_CONTEXT)
 125                 mm->context = get_free_context(mm);
 126 }
 127
 128 /* flush context if allocated... */
 129 static inline void destroy_context(struct mm_struct *mm)
 130 {
 131         if(mm->context != SUN3_INVALID_CONTEXT)
 132                 clear_context(mm->context);
 133 }
 134
 135 static inline void activate_context(struct mm_struct *mm)
 136 {
 137         get_mmu_context(mm);
 138         sun3_put_context(mm->context);
 139 }
 140
 141 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
 142 {
 143         activate_context(tsk->mm);
 144 }
 145
 146 #define deactivate_mm(tsk,mm)   do { } while (0)
 147
 148 static inline void activate_mm(struct mm_struct *prev_mm,
 149                                struct mm_struct *next_mm)
 150 {
 151         activate_context(next_mm);
 152 }
 153
 154 #endif
 155 #else /* !CONFIG_MMU */
 156
 157 static inline int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
 158 {
 159         return 0;
 160 }
 161
 162
 163 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next, struct task_struct *tsk)
 164 {
 165 }
 166
 167 #define destroy_context(mm)     do { } while (0)
 168 #define deactivate_mm(tsk,mm)   do { } while (0)
 169
 170 static inline void activate_mm(struct mm_struct *prev_mm, struct mm_struct *next_mm)
 171 {
 172 }
 173
 174 #endif /* CONFIG_MMU */
 175 #endif /* __M68K_MMU_CONTEXT_H */