root/arch/arm/include/asm/tlb.h

INCLUDED FROM

DEFINITIONS

1. __tlb_remove_table
2. __pte_free_tlb
3. __pmd_free_tlb

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  arch/arm/include/asm/tlb.h
   4  *
   5  *  Copyright (C) 2002 Russell King
   6  *
   7  *  Experimentation shows that on a StrongARM, it appears to be faster
   8  *  to use the "invalidate whole tlb" rather than "invalidate single
   9  *  tlb" for this.
  10  *
  11  *  This appears true for both the process fork+exit case, as well as
  12  *  the munmap-large-area case.
  13  */
  14 #ifndef __ASMARM_TLB_H
  15 #define __ASMARM_TLB_H
  16 
  17 #include <asm/cacheflush.h>
  18 
  19 #ifndef CONFIG_MMU
  20 
  21 #include <linux/pagemap.h>
  22 
  23 #define tlb_flush(tlb)  ((void) tlb)
  24 
  25 #include <asm-generic/tlb.h>
  26 
  27 #else /* !CONFIG_MMU */
  28 
  29 #include <linux/swap.h>
  30 #include <asm/pgalloc.h>
  31 #include <asm/tlbflush.h>
  32 
  33 static inline void __tlb_remove_table(void *_table)
  34 {
  35         free_page_and_swap_cache((struct page *)_table);
  36 }
  37 
  38 #include <asm-generic/tlb.h>
  39 
  40 #ifndef CONFIG_HAVE_RCU_TABLE_FREE
  41 #define tlb_remove_table(tlb, entry) tlb_remove_page(tlb, entry)
  42 #endif
  43 
  44 static inline void
  45 __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
  46 {
  47         pgtable_pte_page_dtor(pte);
  48 
  49 #ifndef CONFIG_ARM_LPAE
  50         /*
  51          * With the classic ARM MMU, a pte page has two corresponding pmd
  52          * entries, each covering 1MB.
  53          */
  54         addr = (addr & PMD_MASK) + SZ_1M;
  55         __tlb_adjust_range(tlb, addr - PAGE_SIZE, 2 * PAGE_SIZE);
  56 #endif
  57 
  58         tlb_remove_table(tlb, pte);
  59 }
  60 
  61 static inline void
  62 __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
  63 {
  64 #ifdef CONFIG_ARM_LPAE
  65         struct page *page = virt_to_page(pmdp);
  66 
  67         tlb_remove_table(tlb, page);
  68 #endif
  69 }
  70 
  71 #endif /* CONFIG_MMU */
  72 #endif