| /* 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); |
| } |