1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_IA64_TLB_H
3 #define _ASM_IA64_TLB_H
4 /*
5 * Based on <asm-generic/tlb.h>.
6 *
7 * Copyright (C) 2002-2003 Hewlett-Packard Co
8 * David Mosberger-Tang <davidm@hpl.hp.com>
9 */
10 /*
11 * Removing a translation from a page table (including TLB-shootdown) is a four-step
12 * procedure:
13 *
14 * (1) Flush (virtual) caches --- ensures virtual memory is coherent with kernel memory
15 * (this is a no-op on ia64).
16 * (2) Clear the relevant portions of the page-table
17 * (3) Flush the TLBs --- ensures that stale content is gone from CPU TLBs
18 * (4) Release the pages that were freed up in step (2).
19 *
20 * Note that the ordering of these steps is crucial to avoid races on MP machines.
21 *
22 * The Linux kernel defines several platform-specific hooks for TLB-shootdown. When
23 * unmapping a portion of the virtual address space, these hooks are called according to
24 * the following template:
25 *
26 * tlb <- tlb_gather_mmu(mm, start, end); // start unmap for address space MM
27 * {
28 * for each vma that needs a shootdown do {
29 * tlb_start_vma(tlb, vma);
30 * for each page-table-entry PTE that needs to be removed do {
31 * tlb_remove_tlb_entry(tlb, pte, address);
32 * if (pte refers to a normal page) {
33 * tlb_remove_page(tlb, page);
34 * }
35 * }
36 * tlb_end_vma(tlb, vma);
37 * }
38 * }
39 * tlb_finish_mmu(tlb, start, end); // finish unmap for address space MM
40 */
41 #include <linux/mm.h>
42 #include <linux/pagemap.h>
43 #include <linux/swap.h>
44
45 #include <asm/pgalloc.h>
46 #include <asm/processor.h>
47 #include <asm/tlbflush.h>
48
49 #include <asm-generic/tlb.h>
50
51 #endif /* _ASM_IA64_TLB_H */