tlb.h 3.4 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3
#ifndef __ASM_SH_TLB_H
#define __ASM_SH_TLB_H

4
#ifdef CONFIG_SUPERH64
5
# include <asm/tlb_64.h>
6 7 8
#endif

#ifndef __ASSEMBLY__
9 10 11
#include <linux/pagemap.h>

#ifdef CONFIG_MMU
12
#include <linux/swap.h>
13 14
#include <asm/pgalloc.h>
#include <asm/tlbflush.h>
15
#include <asm/mmu_context.h>
16 17 18 19 20 21 22 23 24 25

/*
 * TLB handling.  This allows us to remove pages from the page
 * tables, and efficiently handle the TLB issues.
 */
struct mmu_gather {
	struct mm_struct	*mm;
	unsigned int		fullmm;
	unsigned long		start, end;
};
26

27 28 29 30
static inline void init_tlb_gather(struct mmu_gather *tlb)
{
	tlb->start = TASK_SIZE;
	tlb->end = 0;
L
Linus Torvalds 已提交
31

32 33 34 35 36 37
	if (tlb->fullmm) {
		tlb->start = 0;
		tlb->end = TASK_SIZE;
	}
}

P
Peter Zijlstra 已提交
38
static inline void
39
tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm, unsigned long start, unsigned long end)
40 41
{
	tlb->mm = mm;
42 43 44
	tlb->start = start;
	tlb->end = end;
	tlb->fullmm = !(start | (end+1));
45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66

	init_tlb_gather(tlb);
}

static inline void
tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
{
	if (tlb->fullmm)
		flush_tlb_mm(tlb->mm);

	/* keep the page table cache within bounds */
	check_pgt_cache();
}

static inline void
tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
{
	if (tlb->start > address)
		tlb->start = address;
	if (tlb->end < address + PAGE_SIZE)
		tlb->end = address + PAGE_SIZE;
}
L
Linus Torvalds 已提交
67 68

/*
69 70 71
 * In the case of tlb vma handling, we can optimise these away in the
 * case where we're doing a full MM flush.  When we're doing a munmap,
 * the vmas are adjusted to only cover the region to be torn down.
L
Linus Torvalds 已提交
72
 */
73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88
static inline void
tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
{
	if (!tlb->fullmm)
		flush_cache_range(vma, vma->vm_start, vma->vm_end);
}

static inline void
tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
{
	if (!tlb->fullmm && tlb->end) {
		flush_tlb_range(vma, tlb->start, tlb->end);
		init_tlb_gather(tlb);
	}
}

89 90 91 92 93 94 95 96
static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
{
}

static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
{
}

P
Peter Zijlstra 已提交
97 98 99 100 101 102 103
static inline void tlb_flush_mmu(struct mmu_gather *tlb)
{
}

static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
	free_page_and_swap_cache(page);
104
	return false; /* avoid calling tlb_flush_mmu */
P
Peter Zijlstra 已提交
105 106 107 108 109 110 111
}

static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
{
	__tlb_remove_page(tlb, page);
}

112 113 114 115 116 117
static inline bool __tlb_remove_pte_page(struct mmu_gather *tlb,
					 struct page *page)
{
	return __tlb_remove_page(tlb, page);
}

118 119 120
#define pte_free_tlb(tlb, ptep, addr)	pte_free((tlb)->mm, ptep)
#define pmd_free_tlb(tlb, pmdp, addr)	pmd_free((tlb)->mm, pmdp)
#define pud_free_tlb(tlb, pudp, addr)	pud_free((tlb)->mm, pudp)
121 122 123

#define tlb_migrate_finish(mm)		do { } while (0)

124
#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
125 126 127 128 129 130 131 132 133 134 135 136 137
extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
extern void tlb_unwire_entry(void);
#else
static inline void tlb_wire_entry(struct vm_area_struct *vma ,
				  unsigned long addr, pte_t pte)
{
	BUG();
}

static inline void tlb_unwire_entry(void)
{
	BUG();
}
138
#endif
139

140 141 142 143 144 145
#else /* CONFIG_MMU */

#define tlb_start_vma(tlb, vma)				do { } while (0)
#define tlb_end_vma(tlb, vma)				do { } while (0)
#define __tlb_remove_tlb_entry(tlb, pte, address)	do { } while (0)
#define tlb_flush(tlb)					do { } while (0)
L
Linus Torvalds 已提交
146 147

#include <asm-generic/tlb.h>
148

149
#endif /* CONFIG_MMU */
150 151
#endif /* __ASSEMBLY__ */
#endif /* __ASM_SH_TLB_H */