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103 lines
2.5 KiB
103 lines
2.5 KiB
20 years ago
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/*
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* linux/include/asm-arm/tlb.h
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*
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* Copyright (C) 2002 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Experimentation shows that on a StrongARM, it appears to be faster
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* to use the "invalidate whole tlb" rather than "invalidate single
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* tlb" for this.
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*
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* This appears true for both the process fork+exit case, as well as
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* the munmap-large-area case.
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*/
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#ifndef __ASMARM_TLB_H
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#define __ASMARM_TLB_H
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#include <asm/cacheflush.h>
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#include <asm/tlbflush.h>
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#include <asm/pgalloc.h>
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/*
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* TLB handling. This allows us to remove pages from the page
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* tables, and efficiently handle the TLB issues.
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*/
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struct mmu_gather {
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struct mm_struct *mm;
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unsigned int freed;
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unsigned int fullmm;
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unsigned int flushes;
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unsigned int avoided_flushes;
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};
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DECLARE_PER_CPU(struct mmu_gather, mmu_gathers);
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static inline struct mmu_gather *
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tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush)
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{
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int cpu = smp_processor_id();
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struct mmu_gather *tlb = &per_cpu(mmu_gathers, cpu);
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tlb->mm = mm;
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tlb->freed = 0;
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tlb->fullmm = full_mm_flush;
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return tlb;
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}
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static inline void
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tlb_finish_mmu(struct mmu_gather *tlb, unsigned long start, unsigned long end)
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{
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struct mm_struct *mm = tlb->mm;
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unsigned long freed = tlb->freed;
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int rss = get_mm_counter(mm, rss);
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if (rss < freed)
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freed = rss;
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add_mm_counter(mm, rss, -freed);
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if (tlb->fullmm)
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flush_tlb_mm(mm);
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/* keep the page table cache within bounds */
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check_pgt_cache();
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}
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static inline unsigned int tlb_is_full_mm(struct mmu_gather *tlb)
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{
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return tlb->fullmm;
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}
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#define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0)
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/*
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* In the case of tlb vma handling, we can optimise these away in the
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* case where we're doing a full MM flush. When we're doing a munmap,
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* the vmas are adjusted to only cover the region to be torn down.
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*/
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static inline void
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tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
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{
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if (!tlb->fullmm)
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flush_cache_range(vma, vma->vm_start, vma->vm_end);
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}
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static inline void
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tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
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{
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if (!tlb->fullmm)
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flush_tlb_range(vma, vma->vm_start, vma->vm_end);
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}
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#define tlb_remove_page(tlb,page) free_page_and_swap_cache(page)
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#define pte_free_tlb(tlb,ptep) pte_free(ptep)
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#define pmd_free_tlb(tlb,pmdp) pmd_free(pmdp)
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#define tlb_migrate_finish(mm) do { } while (0)
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#endif
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