Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /* SPDX-License-Identifier: GPL-2.0 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2) #ifndef _ASM_IA64_TLB_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3) #define _ASM_IA64_TLB_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5)  * Based on <asm-generic/tlb.h>.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7)  * Copyright (C) 2002-2003 Hewlett-Packard Co
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8)  *	David Mosberger-Tang <davidm@hpl.hp.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)  * Removing a translation from a page table (including TLB-shootdown) is a four-step
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)  * procedure:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14)  *	(1) Flush (virtual) caches --- ensures virtual memory is coherent with kernel memory
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15)  *	    (this is a no-op on ia64).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)  *	(2) Clear the relevant portions of the page-table
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)  *	(3) Flush the TLBs --- ensures that stale content is gone from CPU TLBs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)  *	(4) Release the pages that were freed up in step (2).
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)  * Note that the ordering of these steps is crucial to avoid races on MP machines.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22)  * The Linux kernel defines several platform-specific hooks for TLB-shootdown.  When
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23)  * unmapping a portion of the virtual address space, these hooks are called according to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)  * the following template:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)  *	tlb <- tlb_gather_mmu(mm, start, end);		// start unmap for address space MM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)  *	{
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28)  *	  for each vma that needs a shootdown do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)  *	    tlb_start_vma(tlb, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)  *	      for each page-table-entry PTE that needs to be removed do {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31)  *		tlb_remove_tlb_entry(tlb, pte, address);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)  *		if (pte refers to a normal page) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33)  *		  tlb_remove_page(tlb, page);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34)  *		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35)  *	      }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)  *	    tlb_end_vma(tlb, vma);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37)  *	  }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)  *	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)  *	tlb_finish_mmu(tlb, start, end);	// finish unmap for address space MM
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/mm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #include <linux/pagemap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) #include <linux/swap.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) #include <asm/processor.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #include <asm/tlbflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #include <asm-generic/tlb.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) #endif /* _ASM_IA64_TLB_H */