arch/sh/mm/tlb-sh3.c

   1 /*
   2  * arch/sh/mm/tlb-sh3.c
   3  *
   4  * SH-3 specific TLB operations
   5  *
   6  * Copyright (C) 1999  Niibe Yutaka
   7  * Copyright (C) 2002  Paul Mundt
   8  *
   9  * Released under the terms of the GNU GPL v2.0.
  10  */
  11 #include <linux/signal.h>
  12 #include <linux/sched.h>
  13 #include <linux/kernel.h>
  14 #include <linux/errno.h>
  15 #include <linux/string.h>
  16 #include <linux/types.h>
  17 #include <linux/ptrace.h>
  18 #include <linux/mman.h>
  19 #include <linux/mm.h>
  20 #include <linux/smp.h>
  21 #include <linux/smp_lock.h>
  22 #include <linux/interrupt.h>
  23
  24 #include <asm/system.h>
  25 #include <asm/io.h>
  26 #include <asm/uaccess.h>
  27 #include <asm/pgalloc.h>
  28 #include <asm/mmu_context.h>
  29 #include <asm/cacheflush.h>
  30
  31 void update_mmu_cache(struct vm_area_struct * vma,
  32                       unsigned long address, pte_t pte)
  33 {
  34         unsigned long flags;
  35         unsigned long pteval;
  36         unsigned long vpn;
  37
  38         /* Ptrace may call this routine. */
  39         if (vma && current->active_mm != vma->vm_mm)
  40                 return;
  41
  42 #if defined(CONFIG_SH7705_CACHE_32KB)
  43         {
  44                 struct page *page = pte_page(pte);
  45                 unsigned long pfn = pte_pfn(pte);
  46
  47                 if (pfn_valid(pfn) && !test_bit(PG_mapped, &page->flags)) {
  48                         unsigned long phys = pte_val(pte) & PTE_PHYS_MASK;
  49
  50                         __flush_wback_region((void *)P1SEGADDR(phys),
  51                                              PAGE_SIZE);
  52                         __set_bit(PG_mapped, &page->flags);
  53                 }
  54         }
  55 #endif
  56
  57         local_irq_save(flags);
  58
  59         /* Set PTEH register */
  60         vpn = (address & MMU_VPN_MASK) | get_asid();
  61         ctrl_outl(vpn, MMU_PTEH);
  62
  63         pteval = pte_val(pte);
  64
  65         /* Set PTEL register */
  66         pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
  67         /* conveniently, we want all the software flags to be 0 anyway */
  68         ctrl_outl(pteval, MMU_PTEL);
  69
  70         /* Load the TLB */
  71         asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
  72         local_irq_restore(flags);
  73 }
  74
  75 void local_flush_tlb_one(unsigned long asid, unsigned long page)
  76 {
  77         unsigned long addr, data;
  78         int i, ways = MMU_NTLB_WAYS;
  79
  80         /*
  81          * NOTE: PTEH.ASID should be set to this MM
  82          *       _AND_ we need to write ASID to the array.
  83          *
  84          * It would be simple if we didn't need to set PTEH.ASID...
  85          */
  86         addr = MMU_TLB_ADDRESS_ARRAY | (page & 0x1F000);
  87         data = (page & 0xfffe0000) | asid; /* VALID bit is off */
  88
  89         if ((current_cpu_data.flags & CPU_HAS_MMU_PAGE_ASSOC)) {
  90                 addr |= MMU_PAGE_ASSOC_BIT;
  91                 ways = 1;       /* we already know the way .. */
  92         }
  93
  94         for (i = 0; i < ways; i++)
  95                 ctrl_outl(data, addr + (i << 8));
  96 }
  97