blob: 36ba02191d408251f9eaefa366610824e34d3d69 [file] [log] [blame]
David Howellsb920de12008-02-08 04:19:31 -08001/* MN10300 MMU context allocation and management
2 *
3 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public Licence
8 * as published by the Free Software Foundation; either version
9 * 2 of the Licence, or (at your option) any later version.
10 */
11#include <linux/sched.h>
12#include <linux/mm.h>
13#include <asm/mmu_context.h>
14#include <asm/tlbflush.h>
15
16/*
17 * list of the MMU contexts last allocated on each CPU
18 */
19unsigned long mmu_context_cache[NR_CPUS] = {
20 [0 ... NR_CPUS - 1] = MMU_CONTEXT_FIRST_VERSION * 2 - 1,
21};
22
23/*
24 * flush the specified TLB entry
25 */
26void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
27{
28 unsigned long pteu, cnx, flags;
29
30 addr &= PAGE_MASK;
31
32 /* make sure the context doesn't migrate and defend against
33 * interference from vmalloc'd regions */
34 local_irq_save(flags);
35
36 cnx = mm_context(vma->vm_mm);
37
38 if (cnx != MMU_NO_CONTEXT) {
39 pteu = addr | (cnx & 0x000000ffUL);
40 IPTEU = pteu;
41 DPTEU = pteu;
42 if (IPTEL & xPTEL_V)
43 IPTEL = 0;
44 if (DPTEL & xPTEL_V)
45 DPTEL = 0;
46 }
47
48 local_irq_restore(flags);
49}
50
51/*
52 * preemptively set a TLB entry
53 */
Russell King4b3073e2009-12-18 16:40:18 +000054void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
David Howellsb920de12008-02-08 04:19:31 -080055{
56 unsigned long pteu, ptel, cnx, flags;
Russell King4b3073e2009-12-18 16:40:18 +000057 pte_t pte = *ptep;
David Howellsb920de12008-02-08 04:19:31 -080058
59 addr &= PAGE_MASK;
60 ptel = pte_val(pte) & ~(xPTEL_UNUSED1 | xPTEL_UNUSED2);
61
62 /* make sure the context doesn't migrate and defend against
63 * interference from vmalloc'd regions */
64 local_irq_save(flags);
65
66 cnx = mm_context(vma->vm_mm);
67
68 if (cnx != MMU_NO_CONTEXT) {
69 pteu = addr | (cnx & 0x000000ffUL);
70 if (!(pte_val(pte) & _PAGE_NX)) {
71 IPTEU = pteu;
72 if (IPTEL & xPTEL_V)
73 IPTEL = ptel;
74 }
75 DPTEU = pteu;
76 if (DPTEL & xPTEL_V)
77 DPTEL = ptel;
78 }
79
80 local_irq_restore(flags);
81}