5c7dd7acc3
repo: https://github.com/T-head-Semi/linux commit: b1313fe517ca3703119dcc99ef3bbf75ab42bcfb Change-Id: I6cbb35294024ea3a66140e311f4bb705fd7fd626
51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_IA64_TLB_H
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#define _ASM_IA64_TLB_H
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/*
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* Based on <asm-generic/tlb.h>.
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*
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* Copyright (C) 2002-2003 Hewlett-Packard Co
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* David Mosberger-Tang <davidm@hpl.hp.com>
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*/
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/*
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* Removing a translation from a page table (including TLB-shootdown) is a four-step
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* procedure:
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*
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* (1) Flush (virtual) caches --- ensures virtual memory is coherent with kernel memory
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* (this is a no-op on ia64).
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* (2) Clear the relevant portions of the page-table
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* (3) Flush the TLBs --- ensures that stale content is gone from CPU TLBs
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* (4) Release the pages that were freed up in step (2).
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*
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* Note that the ordering of these steps is crucial to avoid races on MP machines.
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*
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* The Linux kernel defines several platform-specific hooks for TLB-shootdown. When
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* unmapping a portion of the virtual address space, these hooks are called according to
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* the following template:
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*
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* tlb <- tlb_gather_mmu(mm, start, end); // start unmap for address space MM
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* {
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* for each vma that needs a shootdown do {
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* tlb_start_vma(tlb, vma);
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* for each page-table-entry PTE that needs to be removed do {
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* tlb_remove_tlb_entry(tlb, pte, address);
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* if (pte refers to a normal page) {
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* tlb_remove_page(tlb, page);
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* }
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* }
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* tlb_end_vma(tlb, vma);
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* }
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* }
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* tlb_finish_mmu(tlb, start, end); // finish unmap for address space MM
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*/
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#include <linux/mm.h>
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#include <linux/pagemap.h>
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#include <linux/swap.h>
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#include <asm/processor.h>
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#include <asm/tlbflush.h>
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#include <asm-generic/tlb.h>
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#endif /* _ASM_IA64_TLB_H */
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