LXR linux/arch/sh/include/asm/tlb.h

   1#ifndef __ASM_SH_TLB_H
   2#define __ASM_SH_TLB_H
   3
   4#ifdef CONFIG_SUPERH64
   5# include <asm/tlb_64.h>
   6#endif
   7
   8#ifndef __ASSEMBLY__
   9#include <linux/pagemap.h>
  10
  11#ifdef CONFIG_MMU
  12#include <linux/swap.h>
  13#include <asm/pgalloc.h>
  14#include <asm/tlbflush.h>
  15#include <asm/mmu_context.h>
  16
  17/*
  18 * TLB handling.  This allows us to remove pages from the page
  19 * tables, and efficiently handle the TLB issues.
  20 */
  21struct mmu_gather {
  22        struct mm_struct        *mm;
  23        unsigned int            fullmm;
  24        unsigned long           start, end;
  25};
  26
  27static inline void init_tlb_gather(struct mmu_gather *tlb)
  28{
  29        tlb->start = TASK_SIZE;
  30        tlb->end = 0;
  31
  32        if (tlb->fullmm) {
  33                tlb->start = 0;
  34                tlb->end = TASK_SIZE;
  35        }
  36}
  37
  38static inline void
  39tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned int full_mm_flush)
  40{
  41        tlb->mm = mm;
  42        tlb->fullmm = full_mm_flush;
  43
  44        init_tlb_gather(tlb);
  45}
  46
  47static inline void
  48tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
  49{
  50        if (tlb->fullmm)
  51                flush_tlb_mm(tlb->mm);
  52
  53        /* keep the page table cache within bounds */
  54        check_pgt_cache();
  55}
  56
  57static inline void
  58tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
  59{
  60        if (tlb->start > address)
  61                tlb->start = address;
  62        if (tlb->end < address + PAGE_SIZE)
  63                tlb->end = address + PAGE_SIZE;
  64}
  65
  66/*
  67 * In the case of tlb vma handling, we can optimise these away in the
  68 * case where we're doing a full MM flush.  When we're doing a munmap,
  69 * the vmas are adjusted to only cover the region to be torn down.
  70 */
  71static inline void
  72tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  73{
  74        if (!tlb->fullmm)
  75                flush_cache_range(vma, vma->vm_start, vma->vm_end);
  76}
  77
  78static inline void
  79tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
  80{
  81        if (!tlb->fullmm && tlb->end) {
  82                flush_tlb_range(vma, tlb->start, tlb->end);
  83                init_tlb_gather(tlb);
  84        }
  85}
  86
  87static inline void tlb_flush_mmu(struct mmu_gather *tlb)
  88{
  89}
  90
  91static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
  92{
  93        free_page_and_swap_cache(page);
  94        return 1; /* avoid calling tlb_flush_mmu */
  95}
  96
  97static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
  98{
  99        __tlb_remove_page(tlb, page);
 100}
 101
 102#define pte_free_tlb(tlb, ptep, addr)   pte_free((tlb)->mm, ptep)
 103#define pmd_free_tlb(tlb, pmdp, addr)   pmd_free((tlb)->mm, pmdp)
 104#define pud_free_tlb(tlb, pudp, addr)   pud_free((tlb)->mm, pudp)
 105
 106#define tlb_migrate_finish(mm)          do { } while (0)
 107
 108#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
 109extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
 110extern void tlb_unwire_entry(void);
 111#else
 112static inline void tlb_wire_entry(struct vm_area_struct *vma ,
 113                                  unsigned long addr, pte_t pte)
 114{
 115        BUG();
 116}
 117
 118static inline void tlb_unwire_entry(void)
 119{
 120        BUG();
 121}
 122#endif
 123
 124#else /* CONFIG_MMU */
 125
 126#define tlb_start_vma(tlb, vma)                         do { } while (0)
 127#define tlb_end_vma(tlb, vma)                           do { } while (0)
 128#define __tlb_remove_tlb_entry(tlb, pte, address)       do { } while (0)
 129#define tlb_flush(tlb)                                  do { } while (0)
 130
 131#include <asm-generic/tlb.h>
 132
 133#endif /* CONFIG_MMU */
 134#endif /* __ASSEMBLY__ */
 135#endif /* __ASM_SH_TLB_H */
 136