Linux-2.6.12-rc2
[linux-2.6/kvm.git] / include / asm-arm26 / tlb.h
blob1316352a58f3d451b2a1985970a03227643e5ef7
1 #ifndef __ASMARM_TLB_H
2 #define __ASMARM_TLB_H
4 #include <asm/pgalloc.h>
5 #include <asm/tlbflush.h>
7 /*
8 * TLB handling. This allows us to remove pages from the page
9 * tables, and efficiently handle the TLB issues.
11 struct mmu_gather {
12 struct mm_struct *mm;
13 unsigned int freed;
14 unsigned int fullmm;
16 unsigned int flushes;
17 unsigned int avoided_flushes;
20 extern struct mmu_gather mmu_gathers[NR_CPUS];
22 static inline struct mmu_gather *
23 tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
25 int cpu = smp_processor_id();
26 struct mmu_gather *tlb = &mmu_gathers[cpu];
28 tlb->mm = mm;
29 tlb->freed = 0;
30 tlb->fullmm = full_mm_flush;
32 return tlb;
35 static inline void
36 tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
38 struct mm_struct *mm = tlb->mm;
39 unsigned long freed = tlb->freed;
40 int rss = get_mm_counter(mm, rss);
42 if (rss < freed)
43 freed = rss;
44 add_mm_counter(mm, rss, -freed);
46 if (freed) {
47 flush_tlb_mm(mm);
48 tlb->flushes++;
49 } else {
50 tlb->avoided_flushes++;
53 /* keep the page table cache within bounds */
54 check_pgt_cache();
58 static inline unsigned int
59 tlb_is_full_mm(struct mmu_gather *tlb)
61 return tlb->fullmm;
64 #define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0)
65 //#define tlb_start_vma(tlb,vma) do { } while (0)
66 //FIXME - ARM32 uses this now that things changed in the kernel. seems like it may be pointless on arm26, however to get things compiling...
67 #define tlb_start_vma(tlb,vma) \
68 do { \
69 if (!tlb->fullmm) \
70 flush_cache_range(vma, vma->vm_start, vma->vm_end); \
71 } while (0)
72 #define tlb_end_vma(tlb,vma) do { } while (0)
74 #define tlb_remove_page(tlb,page) free_page_and_swap_cache(page)
75 #define pte_free_tlb(tlb,ptep) pte_free(ptep)
76 #define pmd_free_tlb(tlb,pmdp) pmd_free(pmdp)
78 #endif