From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/ia64/include/asm/tlb.h | 50 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+) create mode 100644 arch/ia64/include/asm/tlb.h (limited to 'arch/ia64/include/asm/tlb.h') diff --git a/arch/ia64/include/asm/tlb.h b/arch/ia64/include/asm/tlb.h new file mode 100644 index 000000000..a15fe0809 --- /dev/null +++ b/arch/ia64/include/asm/tlb.h @@ -0,0 +1,50 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _ASM_IA64_TLB_H +#define _ASM_IA64_TLB_H +/* + * Based on . + * + * Copyright (C) 2002-2003 Hewlett-Packard Co + * David Mosberger-Tang + */ +/* + * 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 +#include +#include + +#include +#include + +#include + +#endif /* _ASM_IA64_TLB_H */ -- cgit v1.2.3