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Linux/arch/nds32/mm/tlb.c

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  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 }
 51 

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