diff options
Diffstat (limited to 'arch/arm/include/asm/tlb.h')
-rw-r--r-- | arch/arm/include/asm/tlb.h | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h new file mode 100644 index 0000000000..f40d06ad5d --- /dev/null +++ b/arch/arm/include/asm/tlb.h @@ -0,0 +1,70 @@ +/* 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) +{ + struct ptdesc *ptdesc = page_ptdesc(pte); + + pagetable_pte_dtor(ptdesc); + +#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_ptdesc(tlb, ptdesc); +} + +static inline void +__pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr) +{ +#ifdef CONFIG_ARM_LPAE + struct ptdesc *ptdesc = virt_to_ptdesc(pmdp); + + pagetable_pmd_dtor(ptdesc); + tlb_remove_ptdesc(tlb, ptdesc); +#endif +} + +#endif /* CONFIG_MMU */ +#endif |