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 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); // 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/processor.h> 46 #include <asm/tlbflush.h> 47 48 #include <asm-generic/tlb.h> 49 50 #endif /* _ASM_IA64_TLB_H */ 51