1 files changed, 94 insertions, 0 deletions

diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
new file mode 100644
index 000000000000..857f1dfac794
--- /dev/null
+++ b/arch/arm/include/asm/tlb.h
@@ -0,0 +1,94 @@
+/*
+ *  arch/arm/include/asm/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