arch/nds32/mm/tlb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (C) 2005-2017 Andes Technology Corporation
   3
   4 #include <linux/spinlock_types.h>
   5 #include <linux/mm.h>
   6 #include <linux/sched.h>
   7 #include <asm/nds32.h>
   8 #include <nds32_intrinsic.h>
   9
  10 unsigned int cpu_last_cid = { TLB_MISC_mskCID + (2 << TLB_MISC_offCID) };
  11
  12 DEFINE_SPINLOCK(cid_lock);
  13
  14 void local_flush_tlb_range(struct vm_area_struct *vma,
  15                            unsigned long start, unsigned long end)
  16 {
  17         unsigned long flags, ocid, ncid;
  18
  19         if ((end - start) > 0x400000) {
  20                 __nds32__tlbop_flua();
  21                 __nds32__isb();
  22                 return;
  23         }
  24
  25         spin_lock_irqsave(&cid_lock, flags);
  26         ocid = __nds32__mfsr(NDS32_SR_TLB_MISC);
  27         ncid = (ocid & ~TLB_MISC_mskCID) | vma->vm_mm->context.id;
  28         __nds32__mtsr_dsb(ncid, NDS32_SR_TLB_MISC);
  29         while (start < end) {
  30                 __nds32__tlbop_inv(start);
  31                 __nds32__isb();
  32                 start += PAGE_SIZE;
  33         }
  34         __nds32__mtsr_dsb(ocid, NDS32_SR_TLB_MISC);
  35         spin_unlock_irqrestore(&cid_lock, flags);
  36 }
  37
  38 void local_flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
  39 {
  40         unsigned long flags, ocid, ncid;
  41
  42         spin_lock_irqsave(&cid_lock, flags);
  43         ocid = __nds32__mfsr(NDS32_SR_TLB_MISC);
  44         ncid = (ocid & ~TLB_MISC_mskCID) | vma->vm_mm->context.id;
  45         __nds32__mtsr_dsb(ncid, NDS32_SR_TLB_MISC);
  46         __nds32__tlbop_inv(addr);
  47         __nds32__isb();
  48         __nds32__mtsr_dsb(ocid, NDS32_SR_TLB_MISC);
  49         spin_unlock_irqrestore(&cid_lock, flags);
  50 }