mmu-context.c
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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);
}