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09d842b9 | 1 | /* Mmap management. */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
4 | * Copyright (C) 2009 Free Software Foundation, Inc. | |
5 | * | |
6 | * GRUB is free software: you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation, either version 3 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * GRUB is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with GRUB. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <grub/machine/memory.h> | |
21 | #include <grub/memory.h> | |
22 | #include <grub/err.h> | |
23 | #include <grub/misc.h> | |
24 | #include <grub/mm.h> | |
25 | ||
26 | ||
27 | #ifndef GRUB_MMAP_REGISTER_BY_FIRMWARE | |
28 | ||
2fee74f1 | 29 | void * |
09d842b9 | 30 | grub_mmap_malign_and_register (grub_uint64_t align, grub_uint64_t size, |
31 | int *handle, int type, int flags) | |
32 | { | |
33 | grub_uint64_t highestlow = 0; | |
34 | ||
35 | auto int NESTED_FUNC_ATTR find_hook (grub_uint64_t, grub_uint64_t, | |
36 | grub_uint32_t); | |
37 | int NESTED_FUNC_ATTR find_hook (grub_uint64_t start, grub_uint64_t rangesize, | |
38 | grub_uint32_t memtype) | |
39 | { | |
40 | grub_uint64_t end = start + rangesize; | |
41 | if (memtype != GRUB_MACHINE_MEMORY_AVAILABLE) | |
42 | return 0; | |
43 | if (end > 0x100000) | |
44 | end = 0x100000; | |
45 | if (end > start + size | |
46 | && highestlow < ((end - size) - ((end - size) & (align - 1)))) | |
47 | highestlow = (end - size) - ((end - size) & (align - 1)); | |
48 | return 0; | |
49 | } | |
50 | ||
2fee74f1 | 51 | void *ret; |
09d842b9 | 52 | if (flags & GRUB_MMAP_MALLOC_LOW) |
53 | { | |
54 | /* FIXME: use low-memory mm allocation once it's available. */ | |
55 | grub_mmap_iterate (find_hook); | |
56 | ret = UINT_TO_PTR (highestlow); | |
57 | } | |
58 | else | |
59 | ret = grub_memalign (align, size); | |
60 | ||
61 | if (! ret) | |
62 | { | |
63 | *handle = 0; | |
64 | return 0; | |
65 | } | |
66 | ||
67 | *handle = grub_mmap_register (PTR_TO_UINT64 (ret), size, type); | |
68 | if (! *handle) | |
69 | { | |
70 | grub_free (ret); | |
71 | return 0; | |
72 | } | |
73 | ||
74 | return ret; | |
75 | } | |
76 | ||
77 | void | |
78 | grub_mmap_free_and_unregister (int handle) | |
79 | { | |
80 | struct grub_mmap_region *cur; | |
81 | grub_uint64_t addr; | |
82 | ||
83 | for (cur = grub_mmap_overlays; cur; cur = cur->next) | |
84 | if (cur->handle == handle) | |
85 | break; | |
86 | ||
87 | if (! cur) | |
88 | return; | |
89 | ||
90 | addr = cur->start; | |
91 | ||
92 | grub_mmap_unregister (handle); | |
93 | ||
94 | if (addr >= 0x100000) | |
95 | grub_free (UINT_TO_PTR (addr)); | |
96 | } | |
97 | ||
98 | #endif |