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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 | ||
a9bc60eb | 16 | #ifdef CONFIG_MN10300_TLB_USE_PIDR |
b920de1b DH |
17 | /* |
18 | * list of the MMU contexts last allocated on each CPU | |
19 | */ | |
20 | unsigned long mmu_context_cache[NR_CPUS] = { | |
a9bc60eb AT |
21 | [0 ... NR_CPUS - 1] = |
22 | MMU_CONTEXT_FIRST_VERSION * 2 - (1 - MMU_CONTEXT_TLBPID_LOCK_NR), | |
b920de1b | 23 | }; |
a9bc60eb | 24 | #endif /* CONFIG_MN10300_TLB_USE_PIDR */ |
b920de1b DH |
25 | |
26 | /* | |
27 | * preemptively set a TLB entry | |
28 | */ | |
4b3073e1 | 29 | void update_mmu_cache(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) |
b920de1b DH |
30 | { |
31 | unsigned long pteu, ptel, cnx, flags; | |
4b3073e1 | 32 | pte_t pte = *ptep; |
b920de1b DH |
33 | |
34 | addr &= PAGE_MASK; | |
35 | ptel = pte_val(pte) & ~(xPTEL_UNUSED1 | xPTEL_UNUSED2); | |
36 | ||
37 | /* make sure the context doesn't migrate and defend against | |
38 | * interference from vmalloc'd regions */ | |
39 | local_irq_save(flags); | |
40 | ||
a9bc60eb AT |
41 | cnx = ~MMU_NO_CONTEXT; |
42 | #ifdef CONFIG_MN10300_TLB_USE_PIDR | |
b920de1b | 43 | cnx = mm_context(vma->vm_mm); |
a9bc60eb | 44 | #endif |
b920de1b DH |
45 | |
46 | if (cnx != MMU_NO_CONTEXT) { | |
a9bc60eb AT |
47 | pteu = addr; |
48 | #ifdef CONFIG_MN10300_TLB_USE_PIDR | |
49 | pteu |= cnx & MMU_CONTEXT_TLBPID_MASK; | |
50 | #endif | |
b920de1b DH |
51 | if (!(pte_val(pte) & _PAGE_NX)) { |
52 | IPTEU = pteu; | |
53 | if (IPTEL & xPTEL_V) | |
54 | IPTEL = ptel; | |
55 | } | |
56 | DPTEU = pteu; | |
57 | if (DPTEL & xPTEL_V) | |
58 | DPTEL = ptel; | |
59 | } | |
60 | ||
61 | local_irq_restore(flags); | |
62 | } |