arch/m68k/include/asm/tlbflush.h

   1 #ifndef _M68K_TLBFLUSH_H
   2 #define _M68K_TLBFLUSH_H
   3
   4 #ifdef CONFIG_MMU
   5 #ifndef CONFIG_SUN3
   6
   7 #include <asm/current.h>
   8
   9 static inline void flush_tlb_kernel_page(void *addr)
  10 {
  11         if (CPU_IS_040_OR_060) {
  12                 mm_segment_t old_fs = get_fs();
  13                 set_fs(KERNEL_DS);
  14                 __asm__ __volatile__(".chip 68040\n\t"
  15                                      "pflush (%0)\n\t"
  16                                      ".chip 68k"
  17                                      : : "a" (addr));
  18                 set_fs(old_fs);
  19         } else if (CPU_IS_020_OR_030)
  20                 __asm__ __volatile__("pflush #4,#4,(%0)" : : "a" (addr));
  21 }
  22
  23 /*
  24  * flush all user-space atc entries.
  25  */
  26 static inline void __flush_tlb(void)
  27 {
  28         if (CPU_IS_040_OR_060)
  29                 __asm__ __volatile__(".chip 68040\n\t"
  30                                      "pflushan\n\t"
  31                                      ".chip 68k");
  32         else if (CPU_IS_020_OR_030)
  33                 __asm__ __volatile__("pflush #0,#4");
  34 }
  35
  36 static inline void __flush_tlb040_one(unsigned long addr)
  37 {
  38         __asm__ __volatile__(".chip 68040\n\t"
  39                              "pflush (%0)\n\t"
  40                              ".chip 68k"
  41                              : : "a" (addr));
  42 }
  43
  44 static inline void __flush_tlb_one(unsigned long addr)
  45 {
  46         if (CPU_IS_040_OR_060)
  47                 __flush_tlb040_one(addr);
  48         else if (CPU_IS_020_OR_030)
  49                 __asm__ __volatile__("pflush #0,#4,(%0)" : : "a" (addr));
  50 }
  51
  52 #define flush_tlb() __flush_tlb()
  53
  54 /*
  55  * flush all atc entries (both kernel and user-space entries).
  56  */
  57 static inline void flush_tlb_all(void)
  58 {
  59         if (CPU_IS_040_OR_060)
  60                 __asm__ __volatile__(".chip 68040\n\t"
  61                                      "pflusha\n\t"
  62                                      ".chip 68k");
  63         else if (CPU_IS_020_OR_030)
  64                 __asm__ __volatile__("pflusha");
  65 }
  66
  67 static inline void flush_tlb_mm(struct mm_struct *mm)
  68 {
  69         if (mm == current->active_mm)
  70                 __flush_tlb();
  71 }
  72
  73 static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
  74 {
  75         if (vma->vm_mm == current->active_mm) {
  76                 mm_segment_t old_fs = get_fs();
  77                 set_fs(USER_DS);
  78                 __flush_tlb_one(addr);
  79                 set_fs(old_fs);
  80         }
  81 }
  82
  83 static inline void flush_tlb_range(struct vm_area_struct *vma,
  84                                    unsigned long start, unsigned long end)
  85 {
  86         if (vma->vm_mm == current->active_mm)
  87                 __flush_tlb();
  88 }
  89
  90 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
  91 {
  92         flush_tlb_all();
  93 }
  94
  95 #else
  96
  97
  98 /* Reserved PMEGs. */
  99 extern char sun3_reserved_pmeg[SUN3_PMEGS_NUM];
 100 extern unsigned long pmeg_vaddr[SUN3_PMEGS_NUM];
 101 extern unsigned char pmeg_alloc[SUN3_PMEGS_NUM];
 102 extern unsigned char pmeg_ctx[SUN3_PMEGS_NUM];
 103
 104 /* Flush all userspace mappings one by one...  (why no flush command,
 105    sun?) */
 106 static inline void flush_tlb_all(void)
 107 {
 108        unsigned long addr;
 109        unsigned char ctx, oldctx;
 110
 111        oldctx = sun3_get_context();
 112        for(addr = 0x00000000; addr < TASK_SIZE; addr += SUN3_PMEG_SIZE) {
 113                for(ctx = 0; ctx < 8; ctx++) {
 114                        sun3_put_context(ctx);
 115                        sun3_put_segmap(addr, SUN3_INVALID_PMEG);
 116                }
 117        }
 118
 119        sun3_put_context(oldctx);
 120        /* erase all of the userspace pmeg maps, we've clobbered them
 121           all anyway */
 122        for(addr = 0; addr < SUN3_INVALID_PMEG; addr++) {
 123                if(pmeg_alloc[addr] == 1) {
 124                        pmeg_alloc[addr] = 0;
 125                        pmeg_ctx[addr] = 0;
 126                        pmeg_vaddr[addr] = 0;
 127                }
 128        }
 129
 130 }
 131
 132 /* Clear user TLB entries within the context named in mm */
 133 static inline void flush_tlb_mm (struct mm_struct *mm)
 134 {
 135      unsigned char oldctx;
 136      unsigned char seg;
 137      unsigned long i;
 138
 139      oldctx = sun3_get_context();
 140      sun3_put_context(mm->context);
 141
 142      for(i = 0; i < TASK_SIZE; i += SUN3_PMEG_SIZE) {
 143              seg = sun3_get_segmap(i);
 144              if(seg == SUN3_INVALID_PMEG)
 145                      continue;
 146
 147              sun3_put_segmap(i, SUN3_INVALID_PMEG);
 148              pmeg_alloc[seg] = 0;
 149              pmeg_ctx[seg] = 0;
 150              pmeg_vaddr[seg] = 0;
 151      }
 152
 153      sun3_put_context(oldctx);
 154
 155 }
 156
 157 /* Flush a single TLB page. In this case, we're limited to flushing a
 158    single PMEG */
 159 static inline void flush_tlb_page (struct vm_area_struct *vma,
 160                                    unsigned long addr)
 161 {
 162         unsigned char oldctx;
 163         unsigned char i;
 164
 165         oldctx = sun3_get_context();
 166         sun3_put_context(vma->vm_mm->context);
 167         addr &= ~SUN3_PMEG_MASK;
 168         if((i = sun3_get_segmap(addr)) != SUN3_INVALID_PMEG)
 169         {
 170                 pmeg_alloc[i] = 0;
 171                 pmeg_ctx[i] = 0;
 172                 pmeg_vaddr[i] = 0;
 173                 sun3_put_segmap (addr,  SUN3_INVALID_PMEG);
 174         }
 175         sun3_put_context(oldctx);
 176
 177 }
 178 /* Flush a range of pages from TLB. */
 179
 180 static inline void flush_tlb_range (struct vm_area_struct *vma,
 181                       unsigned long start, unsigned long end)
 182 {
 183         struct mm_struct *mm = vma->vm_mm;
 184         unsigned char seg, oldctx;
 185
 186         start &= ~SUN3_PMEG_MASK;
 187
 188         oldctx = sun3_get_context();
 189         sun3_put_context(mm->context);
 190
 191         while(start < end)
 192         {
 193                 if((seg = sun3_get_segmap(start)) == SUN3_INVALID_PMEG)
 194                      goto next;
 195                 if(pmeg_ctx[seg] == mm->context) {
 196                         pmeg_alloc[seg] = 0;
 197                         pmeg_ctx[seg] = 0;
 198                         pmeg_vaddr[seg] = 0;
 199                 }
 200                 sun3_put_segmap(start, SUN3_INVALID_PMEG);
 201         next:
 202                 start += SUN3_PMEG_SIZE;
 203         }
 204 }
 205
 206 static inline void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 207 {
 208         flush_tlb_all();
 209 }
 210
 211 /* Flush kernel page from TLB. */
 212 static inline void flush_tlb_kernel_page (unsigned long addr)
 213 {
 214         sun3_put_segmap (addr & ~(SUN3_PMEG_SIZE - 1), SUN3_INVALID_PMEG);
 215 }
 216
 217 #endif
 218
 219 #else /* !CONFIG_MMU */
 220
 221 /*
 222  * flush all user-space atc entries.
 223  */
 224 static inline void __flush_tlb(void)
 225 {
 226         BUG();
 227 }
 228
 229 static inline void __flush_tlb_one(unsigned long addr)
 230 {
 231         BUG();
 232 }
 233
 234 #define flush_tlb() __flush_tlb()
 235
 236 /*
 237  * flush all atc entries (both kernel and user-space entries).
 238  */
 239 static inline void flush_tlb_all(void)
 240 {
 241         BUG();
 242 }
 243
 244 static inline void flush_tlb_mm(struct mm_struct *mm)
 245 {
 246         BUG();
 247 }
 248
 249 static inline void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
 250 {
 251         BUG();
 252 }
 253
 254 static inline void flush_tlb_range(struct mm_struct *mm,
 255                                    unsigned long start, unsigned long end)
 256 {
 257         BUG();
 258 }
 259
 260 static inline void flush_tlb_kernel_page(unsigned long addr)
 261 {
 262         BUG();
 263 }
 264
 265 #endif /* CONFIG_MMU */
 266
 267 #endif /* _M68K_TLBFLUSH_H */