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50 lines
1.5 KiB
50 lines
1.5 KiB
/* 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 <[email protected]> |
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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 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); // 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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