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Commit | Line | Data |
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cbd15b3f LFT |
1 | /* |
2 | * Copyright (C) 2009 Wind River Systems Inc | |
3 | * Implemented by fredrik.markstrom@gmail.com and ivarholmqvist@gmail.com | |
4 | * | |
5 | * This file is subject to the terms and conditions of the GNU General Public | |
6 | * License. See the file "COPYING" in the main directory of this archive | |
7 | * for more details. | |
8 | */ | |
9 | ||
10 | #include <linux/mm.h> | |
11 | #include <linux/sched.h> | |
12 | ||
13 | #include <asm/pgtable.h> | |
14 | #include <asm/cpuinfo.h> | |
15 | ||
16 | /* pteaddr: | |
17 | * ptbase | vpn* | zero | |
18 | * 31-22 | 21-2 | 1-0 | |
19 | * | |
20 | * *vpn is preserved on double fault | |
21 | * | |
22 | * tlbacc: | |
23 | * IG |*flags| pfn | |
24 | * 31-25|24-20 | 19-0 | |
25 | * | |
26 | * *crwxg | |
27 | * | |
28 | * tlbmisc: | |
29 | * resv |way |rd | we|pid |dbl|bad|perm|d | |
30 | * 31-24 |23-20 |19 | 20|17-4|3 |2 |1 |0 | |
31 | * | |
32 | */ | |
33 | ||
34 | /* | |
35 | * Initialize a new pgd / pmd table with invalid pointers. | |
36 | */ | |
37 | static void pgd_init(pgd_t *pgd) | |
38 | { | |
39 | unsigned long *p = (unsigned long *) pgd; | |
40 | int i; | |
41 | ||
42 | for (i = 0; i < USER_PTRS_PER_PGD; i += 8) { | |
43 | p[i + 0] = (unsigned long) invalid_pte_table; | |
44 | p[i + 1] = (unsigned long) invalid_pte_table; | |
45 | p[i + 2] = (unsigned long) invalid_pte_table; | |
46 | p[i + 3] = (unsigned long) invalid_pte_table; | |
47 | p[i + 4] = (unsigned long) invalid_pte_table; | |
48 | p[i + 5] = (unsigned long) invalid_pte_table; | |
49 | p[i + 6] = (unsigned long) invalid_pte_table; | |
50 | p[i + 7] = (unsigned long) invalid_pte_table; | |
51 | } | |
52 | } | |
53 | ||
54 | pgd_t *pgd_alloc(struct mm_struct *mm) | |
55 | { | |
56 | pgd_t *ret, *init; | |
57 | ||
58 | ret = (pgd_t *) __get_free_pages(GFP_KERNEL, PGD_ORDER); | |
59 | if (ret) { | |
60 | init = pgd_offset(&init_mm, 0UL); | |
61 | pgd_init(ret); | |
62 | memcpy(ret + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD, | |
63 | (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t)); | |
64 | } | |
65 | ||
66 | return ret; | |
67 | } | |
68 | ||
69 | void __init pagetable_init(void) | |
70 | { | |
71 | /* Initialize the entire pgd. */ | |
72 | pgd_init(swapper_pg_dir); | |
73 | pgd_init(swapper_pg_dir + USER_PTRS_PER_PGD); | |
74 | } |