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   1 /*
   2  * TLB flushing operations for SH with an MMU.
   3  *
   4  *  Copyright (C) 1999  Niibe Yutaka
   5  *  Copyright (C) 2003  Paul Mundt
   6  *
   7  * This file is subject to the terms and conditions of the GNU General Public
   8  * License.  See the file "COPYING" in the main directory of this archive
   9  * for more details.
  10  */
  11 #include <linux/mm.h>
  12 #include <asm/mmu_context.h>
  13 #include <asm/tlbflush.h>
  14
  15 void flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
  16 {
  17         if (vma->vm_mm && vma->vm_mm->context.id != NO_CONTEXT) {
  18                 unsigned long flags;
  19                 unsigned long asid;
  20                 unsigned long saved_asid = MMU_NO_ASID;
  21
  22                 asid = vma->vm_mm->context.id & MMU_CONTEXT_ASID_MASK;
  23                 page &= PAGE_MASK;
  24
  25                 local_irq_save(flags);
  26                 if (vma->vm_mm != current->mm) {
  27                         saved_asid = get_asid();
  28                         set_asid(asid);
  29                 }
  30                 __flush_tlb_page(asid, page);
  31                 if (saved_asid != MMU_NO_ASID)
  32                         set_asid(saved_asid);
  33                 local_irq_restore(flags);
  34         }
  35 }
  36
  37 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
  38                      unsigned long end)
  39 {
  40         struct mm_struct *mm = vma->vm_mm;
  41
  42         if (mm->context.id != NO_CONTEXT) {
  43                 unsigned long flags;
  44                 int size;
  45
  46                 local_irq_save(flags);
  47                 size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
  48                 if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
  49                         mm->context.id = NO_CONTEXT;
  50                         if (mm == current->mm)
  51                                 activate_context(mm);
  52                 } else {
  53                         unsigned long asid;
  54                         unsigned long saved_asid = MMU_NO_ASID;
  55
  56                         asid = mm->context.id & MMU_CONTEXT_ASID_MASK;
  57                         start &= PAGE_MASK;
  58                         end += (PAGE_SIZE - 1);
  59                         end &= PAGE_MASK;
  60                         if (mm != current->mm) {
  61                                 saved_asid = get_asid();
  62                                 set_asid(asid);
  63                         }
  64                         while (start < end) {
  65                                 __flush_tlb_page(asid, start);
  66                                 start += PAGE_SIZE;
  67                         }
  68                         if (saved_asid != MMU_NO_ASID)
  69                                 set_asid(saved_asid);
  70                 }
  71                 local_irq_restore(flags);
  72         }
  73 }
  74
  75 void flush_tlb_kernel_range(unsigned long start, unsigned long end)
  76 {
  77         unsigned long flags;
  78         int size;
  79
  80         local_irq_save(flags);
  81         size = (end - start + (PAGE_SIZE - 1)) >> PAGE_SHIFT;
  82         if (size > (MMU_NTLB_ENTRIES/4)) { /* Too many TLB to flush */
  83                 flush_tlb_all();
  84         } else {
  85                 unsigned long asid;
  86                 unsigned long saved_asid = get_asid();
  87
  88                 asid = init_mm.context.id & MMU_CONTEXT_ASID_MASK;
  89                 start &= PAGE_MASK;
  90                 end += (PAGE_SIZE - 1);
  91                 end &= PAGE_MASK;
  92                 set_asid(asid);
  93                 while (start < end) {
  94                         __flush_tlb_page(asid, start);
  95                         start += PAGE_SIZE;
  96                 }
  97                 set_asid(saved_asid);
  98         }
  99         local_irq_restore(flags);
 100 }
 101
 102 void flush_tlb_mm(struct mm_struct *mm)
 103 {
 104         /* Invalidate all TLB of this process. */
 105         /* Instead of invalidating each TLB, we get new MMU context. */
 106         if (mm->context.id != NO_CONTEXT) {
 107                 unsigned long flags;
 108
 109                 local_irq_save(flags);
 110                 mm->context.id = NO_CONTEXT;
 111                 if (mm == current->mm)
 112                         activate_context(mm);
 113                 local_irq_restore(flags);
 114         }
 115 }
 116
 117 void flush_tlb_all(void)
 118 {
 119         unsigned long flags, status;
 120
 121         /*
 122          * Flush all the TLB.
 123          *
 124          * Write to the MMU control register's bit:
 125          *      TF-bit for SH-3, TI-bit for SH-4.
 126          *      It's same position, bit #2.
 127          */
 128         local_irq_save(flags);
 129         status = ctrl_inl(MMUCR);
 130         status |= 0x04;
 131         ctrl_outl(status, MMUCR);
 132         ctrl_barrier();
 133         local_irq_restore(flags);
 134 }