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bbee0f2b | 1 | /* |
2 | * GRUB -- GRand Unified Bootloader | |
3 | * Copyright (C) 2009 Free Software Foundation, Inc. | |
4 | * | |
5 | * GRUB is free software: you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation, either version 3 of the License, or | |
8 | * (at your option) any later version. | |
9 | * | |
10 | * GRUB is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | * GNU General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU General Public License | |
16 | * along with GRUB. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <grub/normal.h> | |
20 | #include <grub/dl.h> | |
21 | #include <grub/file.h> | |
22 | #include <grub/disk.h> | |
23 | #include <grub/misc.h> | |
24 | #include <grub/xnu.h> | |
25 | #include <grub/cpu/xnu.h> | |
26 | #include <grub/mm.h> | |
27 | #include <grub/loader.h> | |
28 | ||
29 | static void *grub_xnu_hibernate_image; | |
30 | ||
31 | static grub_err_t | |
32 | grub_xnu_resume_unload (void) | |
33 | { | |
34 | /* Free loaded image */ | |
35 | if (grub_xnu_hibernate_image) | |
36 | grub_free (grub_xnu_hibernate_image); | |
37 | grub_xnu_hibernate_image = 0; | |
38 | grub_xnu_unlock (); | |
39 | return GRUB_ERR_NONE; | |
40 | } | |
41 | ||
42 | grub_err_t | |
43 | grub_xnu_resume (char *imagename) | |
44 | { | |
45 | grub_file_t file; | |
46 | grub_size_t total_header_size; | |
47 | struct grub_xnu_hibernate_header hibhead; | |
48 | char *buf, *codetmp; | |
49 | ||
50 | grub_uint32_t codedest; | |
51 | grub_uint32_t codesize; | |
52 | ||
53 | file = grub_file_open (imagename); | |
54 | if (! file) | |
55 | return 0; | |
56 | ||
57 | /* Read the header. */ | |
58 | if (grub_file_read (file, (char *) &hibhead, sizeof (hibhead)) | |
59 | !=sizeof (hibhead)) | |
60 | { | |
61 | grub_file_close (file); | |
62 | return grub_error (GRUB_ERR_READ_ERROR, | |
63 | "cannot read the hibernate header"); | |
64 | } | |
65 | ||
66 | /* Check the header. */ | |
67 | if (hibhead.magic != GRUB_XNU_HIBERNATE_MAGIC) | |
68 | { | |
69 | grub_file_close (file); | |
70 | return grub_error (GRUB_ERR_BAD_OS, | |
71 | "hibernate header has incorrect magic number"); | |
72 | } | |
73 | if (hibhead.encoffset) | |
74 | { | |
75 | grub_file_close (file); | |
76 | return grub_error (GRUB_ERR_BAD_OS, | |
77 | "encrypted images aren't supported yet"); | |
78 | } | |
79 | ||
80 | codedest = hibhead.launchcode_target_page; | |
81 | codedest *= GRUB_XNU_PAGESIZE; | |
82 | codesize = hibhead.launchcode_numpages; | |
83 | codesize *= GRUB_XNU_PAGESIZE; | |
84 | ||
85 | /* FIXME: check that codedest..codedest+codesize is available. */ | |
86 | ||
87 | /* Calculate total size before pages to copy. */ | |
88 | total_header_size = hibhead.extmapsize + sizeof (hibhead); | |
89 | ||
90 | /* Unload image if any. */ | |
91 | if (grub_xnu_hibernate_image) | |
92 | grub_free (grub_xnu_hibernate_image); | |
93 | ||
94 | /* Try to allocate necessary space. | |
95 | FIXME: mm isn't good enough yet to handle huge allocations. | |
96 | */ | |
97 | grub_xnu_hibernate_image = buf = grub_malloc (hibhead.image_size); | |
98 | if (! buf) | |
99 | { | |
100 | grub_file_close (file); | |
101 | return grub_error (GRUB_ERR_OUT_OF_MEMORY, | |
102 | "not enough memory to load image"); | |
103 | } | |
104 | ||
105 | /* Read image. */ | |
106 | if (grub_file_seek (file, 0) == (grub_off_t)-1 | |
107 | || grub_file_read (file, buf, hibhead.image_size) | |
108 | != (grub_ssize_t) hibhead.image_size) | |
109 | { | |
110 | grub_file_close (file); | |
111 | return grub_error (GRUB_ERR_READ_ERROR, "Cannot read resume image."); | |
112 | } | |
113 | grub_file_close (file); | |
114 | ||
115 | codetmp = grub_memalign (GRUB_XNU_PAGESIZE, codesize + GRUB_XNU_PAGESIZE); | |
116 | /* Setup variables needed by asm helper. */ | |
117 | grub_xnu_heap_will_be_at = codedest; | |
118 | grub_xnu_heap_start = codetmp; | |
119 | grub_xnu_heap_size = codesize; | |
120 | grub_xnu_stack = (codedest + hibhead.stack); | |
121 | grub_xnu_entry_point = (codedest + hibhead.entry_point); | |
122 | grub_xnu_arg1 = (long) buf; | |
123 | ||
124 | /* Prepare asm helper. */ | |
125 | grub_memcpy (codetmp, ((grub_uint8_t *) buf) + total_header_size, codesize); | |
126 | grub_memcpy (codetmp + codesize, grub_xnu_launcher_start, | |
127 | grub_xnu_launcher_end - grub_xnu_launcher_start); | |
128 | ||
129 | /* We're ready now. */ | |
130 | grub_loader_set ((grub_err_t (*) (void)) (codetmp + codesize), | |
131 | grub_xnu_resume_unload, 0); | |
132 | ||
133 | /* Prevent module from unloading. */ | |
134 | grub_xnu_lock (); | |
135 | return GRUB_ERR_NONE; | |
136 | } |