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 long start, unsigned long end)
40{
41	tlb->mm = mm;
42	tlb->start = start;
43	tlb->end = end;
44	tlb->fullmm = !(start | (end+1));
45
46	init_tlb_gather(tlb);
47}
48
49static inline void
50tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
51{
52	if (tlb->fullmm)
53		flush_tlb_mm(tlb->mm);
54
55	/* keep the page table cache within bounds */
56	check_pgt_cache();
57}
58
59static inline void
60tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
61{
62	if (tlb->start > address)
63		tlb->start = address;
64	if (tlb->end < address + PAGE_SIZE)
65		tlb->end = address + PAGE_SIZE;
66}
67
68/*
69 * In the case of tlb vma handling, we can optimise these away in the
70 * case where we're doing a full MM flush.  When we're doing a munmap,
71 * the vmas are adjusted to only cover the region to be torn down.
72 */
73static inline void
74tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
75{
76	if (!tlb->fullmm)
77		flush_cache_range(vma, vma->vm_start, vma->vm_end);
78}
79
80static inline void
81tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
82{
83	if (!tlb->fullmm && tlb->end) {
84		flush_tlb_range(vma, tlb->start, tlb->end);
85		init_tlb_gather(tlb);
86	}
87}
88
89static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
90{
91}
92
93static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
94{
95}
96
97static inline void tlb_flush_mmu(struct mmu_gather *tlb)
98{
99}
100
101static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
102{
103	free_page_and_swap_cache(page);
104	return 1; /* avoid calling tlb_flush_mmu */
105}
106
107static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
108{
109	__tlb_remove_page(tlb, page);
110}
111
112#define pte_free_tlb(tlb, ptep, addr)	pte_free((tlb)->mm, ptep)
113#define pmd_free_tlb(tlb, pmdp, addr)	pmd_free((tlb)->mm, pmdp)
114#define pud_free_tlb(tlb, pudp, addr)	pud_free((tlb)->mm, pudp)
115
116#define tlb_migrate_finish(mm)		do { } while (0)
117
118#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
119extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
120extern void tlb_unwire_entry(void);
121#else
122static inline void tlb_wire_entry(struct vm_area_struct *vma ,
123				  unsigned long addr, pte_t pte)
124{
125	BUG();
126}
127
128static inline void tlb_unwire_entry(void)
129{
130	BUG();
131}
132#endif
133
134#else /* CONFIG_MMU */
135
136#define tlb_start_vma(tlb, vma)				do { } while (0)
137#define tlb_end_vma(tlb, vma)				do { } while (0)
138#define __tlb_remove_tlb_entry(tlb, pte, address)	do { } while (0)
139#define tlb_flush(tlb)					do { } while (0)
140
141#include <asm-generic/tlb.h>
142
143#endif /* CONFIG_MMU */
144#endif /* __ASSEMBLY__ */
145#endif /* __ASM_SH_TLB_H */
146