xref: /kernel/linux/linux-6.6/arch/ia64/include/asm/tlb.h

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

#include <asm/processor.h>
#include <asm/tlbflush.h>

#include <asm-generic/tlb.h>

#endif /* _ASM_IA64_TLB_H */