root/arch/sh/mm/tlb-sh4.c

DEFINITIONS

1. __update_tlb
2. local_flush_tlb_one
3. local_flush_tlb_all

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/sh/mm/tlb-sh4.c
   4  *
   5  * SH-4 specific TLB operations
   6  *
   7  * Copyright (C) 1999  Niibe Yutaka
   8  * Copyright (C) 2002 - 2007 Paul Mundt
   9  */
  10 #include <linux/kernel.h>
  11 #include <linux/mm.h>
  12 #include <linux/io.h>
  13 #include <asm/mmu_context.h>
  14 #include <asm/cacheflush.h>
  15 
  16 void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte)
  17 {
  18         unsigned long flags, pteval, vpn;
  19 
  20         /*
  21          * Handle debugger faulting in for debugee.
  22          */
  23         if (vma && current->active_mm != vma->vm_mm)
  24                 return;
  25 
  26         local_irq_save(flags);
  27 
  28         /* Set PTEH register */
  29         vpn = (address & MMU_VPN_MASK) | get_asid();
  30         __raw_writel(vpn, MMU_PTEH);
  31 
  32         pteval = pte.pte_low;
  33 
  34         /* Set PTEA register */
  35 #ifdef CONFIG_X2TLB
  36         /*
  37          * For the extended mode TLB this is trivial, only the ESZ and
  38          * EPR bits need to be written out to PTEA, with the remainder of
  39          * the protection bits (with the exception of the compat-mode SZ
  40          * and PR bits, which are cleared) being written out in PTEL.
  41          */
  42         __raw_writel(pte.pte_high, MMU_PTEA);
  43 #else
  44         if (cpu_data->flags & CPU_HAS_PTEA) {
  45                 /* The last 3 bits and the first one of pteval contains
  46                  * the PTEA timing control and space attribute bits
  47                  */
  48                 __raw_writel(copy_ptea_attributes(pteval), MMU_PTEA);
  49         }
  50 #endif
  51 
  52         /* Set PTEL register */
  53         pteval &= _PAGE_FLAGS_HARDWARE_MASK; /* drop software flags */
  54 #ifdef CONFIG_CACHE_WRITETHROUGH
  55         pteval |= _PAGE_WT;
  56 #endif
  57         /* conveniently, we want all the software flags to be 0 anyway */
  58         __raw_writel(pteval, MMU_PTEL);
  59 
  60         /* Load the TLB */
  61         asm volatile("ldtlb": /* no output */ : /* no input */ : "memory");
  62         local_irq_restore(flags);
  63 }
  64 
  65 void local_flush_tlb_one(unsigned long asid, unsigned long page)
  66 {
  67         unsigned long addr, data;
  68 
  69         /*
  70          * NOTE: PTEH.ASID should be set to this MM
  71          *       _AND_ we need to write ASID to the array.
  72          *
  73          * It would be simple if we didn't need to set PTEH.ASID...
  74          */
  75         addr = MMU_UTLB_ADDRESS_ARRAY | MMU_PAGE_ASSOC_BIT;
  76         data = page | asid; /* VALID bit is off */
  77         jump_to_uncached();
  78         __raw_writel(data, addr);
  79         back_to_cached();
  80 }
  81 
  82 void local_flush_tlb_all(void)
  83 {
  84         unsigned long flags, status;
  85         int i;
  86 
  87         /*
  88          * Flush all the TLB.
  89          */
  90         local_irq_save(flags);
  91         jump_to_uncached();
  92 
  93         status = __raw_readl(MMUCR);
  94         status = ((status & MMUCR_URB) >> MMUCR_URB_SHIFT);
  95 
  96         if (status == 0)
  97                 status = MMUCR_URB_NENTRIES;
  98 
  99         for (i = 0; i < status; i++)
 100                 __raw_writel(0x0, MMU_UTLB_ADDRESS_ARRAY | (i << 8));
 101 
 102         for (i = 0; i < 4; i++)
 103                 __raw_writel(0x0, MMU_ITLB_ADDRESS_ARRAY | (i << 8));
 104 
 105         back_to_cached();
 106         ctrl_barrier();
 107         local_irq_restore(flags);
 108 }