1 files changed, 68 insertions, 0 deletions
diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
new file mode 100644
index 000000000..b8cbe03ad
--- /dev/null
+++ b/arch/arm/include/asm/tlb.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  arch/arm/include/asm/tlb.h
+ *
+ *  Copyright (C) 2002 Russell King
+ *
+ *  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>
+
+#ifndef CONFIG_MMU
+
+#include <linux/pagemap.h>
+
+#define tlb_flush(tlb)	((void) tlb)
+
+#include <asm-generic/tlb.h>
+
+#else /* !CONFIG_MMU */
+
+#include <linux/swap.h>
+#include <asm/tlbflush.h>
+
+static inline void __tlb_remove_table(void *_table)
+{
+	free_page_and_swap_cache((struct page *)_table);
+}
+
+#include <asm-generic/tlb.h>
+
+static inline void
+__pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
+{
+	pgtable_pte_page_dtor(pte);
+
+#ifndef CONFIG_ARM_LPAE
+	/*
+	 * With the classic ARM MMU, a pte page has two corresponding pmd
+	 * entries, each covering 1MB.
+	 */
+	addr = (addr & PMD_MASK) + SZ_1M;
+	__tlb_adjust_range(tlb, addr - PAGE_SIZE, 2 * PAGE_SIZE);
+#endif
+
+	tlb_remove_table(tlb, pte);
+}
+
+static inline void
+__pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
+{
+#ifdef CONFIG_ARM_LPAE
+	struct page *page = virt_to_page(pmdp);
+
+	pgtable_pmd_page_dtor(page);
+	tlb_remove_table(tlb, page);
+#endif
+}
+
+#endif /* CONFIG_MMU */
+#endif