1 /* 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 */
19 unsigned 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 */
flush_tlb_page(struct vm_area_struct * vma,unsigned long addr)26 void 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 */
update_mmu_cache(struct vm_area_struct * vma,unsigned long addr,pte_t pte)54 void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t pte)
55 {
56 unsigned long pteu, ptel, cnx, flags;
57
58 addr &= PAGE_MASK;
59 ptel = pte_val(pte) & ~(xPTEL_UNUSED1 | xPTEL_UNUSED2);
60
61 /* make sure the context doesn't migrate and defend against
62 * interference from vmalloc'd regions */
63 local_irq_save(flags);
64
65 cnx = mm_context(vma->vm_mm);
66
67 if (cnx != MMU_NO_CONTEXT) {
68 pteu = addr | (cnx & 0x000000ffUL);
69 if (!(pte_val(pte) & _PAGE_NX)) {
70 IPTEU = pteu;
71 if (IPTEL & xPTEL_V)
72 IPTEL = ptel;
73 }
74 DPTEU = pteu;
75 if (DPTEL & xPTEL_V)
76 DPTEL = ptel;
77 }
78
79 local_irq_restore(flags);
80 }
81