63 lines
1.6 KiB
C
Executable File
63 lines
1.6 KiB
C
Executable File
/* 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);
|
|
}
|