]>
Commit | Line | Data |
---|---|---|
b920de1b DH |
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 | */ | |
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 | */ | |
4b3073e1 | 54 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) |
b920de1b DH |
55 | { |
56 | unsigned long pteu, ptel, cnx, flags; | |
4b3073e1 | 57 | pte_t pte = *ptep; |
b920de1b DH |
58 | |
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 | } |