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kernel/linux-rt-4.4.41/arch/mn10300/mm/mmu-context.c 1.57 KB
5113f6f70   김현기   kernel add
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  /* MN10300 MMU context allocation and management
   *
   * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public Licence
   * as published by the Free Software Foundation; either version
   * 2 of the Licence, or (at your option) any later version.
   */
  #include <linux/sched.h>
  #include <linux/mm.h>
  #include <asm/mmu_context.h>
  #include <asm/tlbflush.h>
  
  #ifdef CONFIG_MN10300_TLB_USE_PIDR
  /*
   * list of the MMU contexts last allocated on each CPU
   */
  unsigned long mmu_context_cache[NR_CPUS] = {
  	[0 ... NR_CPUS - 1] =
  	MMU_CONTEXT_FIRST_VERSION * 2 - (1 - MMU_CONTEXT_TLBPID_LOCK_NR),
  };
  #endif /* CONFIG_MN10300_TLB_USE_PIDR */
  
  /*
   * preemptively set a TLB entry
   */
  void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
  {
  	unsigned long pteu, ptel, cnx, flags;
  	pte_t pte = *ptep;
  
  	addr &= PAGE_MASK;
  	ptel = pte_val(pte) & ~(xPTEL_UNUSED1 | xPTEL_UNUSED2);
  
  	/* make sure the context doesn't migrate and defend against
  	 * interference from vmalloc'd regions */
  	local_irq_save(flags);
  
  	cnx = ~MMU_NO_CONTEXT;
  #ifdef CONFIG_MN10300_TLB_USE_PIDR
  	cnx = mm_context(vma->vm_mm);
  #endif
  
  	if (cnx != MMU_NO_CONTEXT) {
  		pteu = addr;
  #ifdef CONFIG_MN10300_TLB_USE_PIDR
  		pteu |= cnx & MMU_CONTEXT_TLBPID_MASK;
  #endif
  		if (!(pte_val(pte) & _PAGE_NX)) {
  			IPTEU = pteu;
  			if (IPTEL & xPTEL_V)
  				IPTEL = ptel;
  		}
  		DPTEU = pteu;
  		if (DPTEL & xPTEL_V)
  			DPTEL = ptel;
  	}
  
  	local_irq_restore(flags);
  }