include/asm-m68k/mmu_context.h

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