/* * linux/include/asm-arm/tlb.h * * Copyright (C) 2002 Russell King * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * Experimentation shows that on a StrongARM, it appears to be faster * to use the "invalidate whole tlb" rather than "invalidate single * tlb" for this. * * This appears true for both the process fork+exit case, as well as * the munmap-large-area case. */ #ifndef __ASMARM_TLB_H #define __ASMARM_TLB_H #include <asm/cacheflush.h> #include <asm/tlbflush.h> #ifndef CONFIG_MMU #include <linux/pagemap.h> #include <asm-generic/tlb.h> #else /* !CONFIG_MMU */ #include <asm/pgalloc.h> /* * 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; }; DECLARE_PER_CPU(struct mmu_gather, mmu_gathers); static inline struct mmu_gather * tlb_gather_mmu(struct mm_struct *mm, unsigned int full_mm_flush) { struct mmu_gather *tlb = &get_cpu_var(mmu_gathers); tlb->mm = mm; tlb->fullmm = full_mm_flush; return 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(); put_cpu_var(mmu_gathers); } #define tlb_remove_tlb_entry(tlb,ptep,address) do { } while (0) /* * 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. */ 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) flush_tlb_range(vma, vma->vm_start, vma->vm_end); } #define tlb_remove_page(tlb,page) free_page_and_swap_cache(page) #define pte_free_tlb(tlb, ptep) pte_free((tlb)->mm, ptep) #define pmd_free_tlb(tlb, pmdp) pmd_free((tlb)->mm, pmdp) #define tlb_migrate_finish(mm) do { } while (0) #endif /* CONFIG_MMU */ #endif