Mercurial > lcfOS

annotate cos/kernel/initrd.c @ 410:6aa9743ed362 tip

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Reflect change in c3 public modifier
author Windel Bouwman
date Mon, 23 Feb 2015 21:06:04 +0100
parents e47bfef80baf
children
rev   line source
32
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
1 /*
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
2 * Initial ramdisk filesystem driver.
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
3 * */
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
4
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
5 #include "kernel.h"
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
6
41
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
7 // Global data struct:
43
e47bfef80baf Fixed build by commenting out initrd code
windel
parents: 41
diff changeset
8 //initrd_file_header_t *files;
32
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
9
43
e47bfef80baf Fixed build by commenting out initrd code
windel
parents: 41
diff changeset
10 /*
32
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
11 fs_node_t* initialize_initrd(uint64_t location)
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
12 {
41
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
13 uint32_t *u32ptr;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
14
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
15 u32ptr = (uint32_t*)location;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
16 if (*u32ptr != 0x1337babe)
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
17 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
18 printf("Invalid ramdisk magic\n");
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
19 return 0;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
20 }
32
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
21
41
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
22 // Allocate root dir:
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
23 fs_node_t *root = (fs_node_t*)kmalloc(sizeof(fs_node_t));
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
24 memset(root, 0, sizeof(fs_node_t));
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
25 root->flags = FS_DIRECTORY;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
26 root->readdir = initrd_readdir;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
27
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
28 u32ptr++;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
29 root->length = *u32ptr;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
30
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
31 // Allocate an node for each file.
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
32 void *x = kmalloc(sizeof(fs_node_t) * root->length);
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
33 memset(x, 0, sizeof(fs_node_t) * root->length);
32
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
34
41
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
35 for (i = 0; i < root->length; i++)
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
36 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
37
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
38 }
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
39
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
40 return root;
32
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
41 }
3a6a9b929db0 Added initial ramdisk and some virtual file system functions
windel
parents:
diff changeset
42
43
e47bfef80baf Fixed build by commenting out initrd code
windel
parents: 41
diff changeset
43 */
e47bfef80baf Fixed build by commenting out initrd code
windel
parents: 41
diff changeset
44
41
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
45 void load_ramdisk()
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
46 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
47 printf("Ramdisk location: %p\n", ramdisk_location);
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
48
43
e47bfef80baf Fixed build by commenting out initrd code
windel
parents: 41
diff changeset
49 /*
41
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
50 fs_node_t *root = initialize_initrd(ramdisk_location);
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
51
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
52 if (root != 0)
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
53 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
54 fs_node_t *node = 0;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
55 int i = 0;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
56 while ( (node = readdir_fs(root, i)) != 0)
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
57 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
58 printf("File %s\n", node->name);
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
59 }
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
60 }
43
e47bfef80baf Fixed build by commenting out initrd code
windel
parents: 41
diff changeset
61 */
41
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
62 }
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
63
43
e47bfef80baf Fixed build by commenting out initrd code
windel
parents: 41
diff changeset
64 /*
41
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
65 static uint64_t initrd_read(fs_node_t *node, uint64_t offset, uint64_t size, void *buffer)
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
66 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
67 // TODO: check errors
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
68
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
69 if (size > node->length)
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
70 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
71 return 0;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
72 }
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
73
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
74 if (size + offset > node->length)
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
75 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
76 size = node->length - offset;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
77 }
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
78
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
79 memcpy(buffer, node.data + offset, size);
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
80 return size;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
81 }
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
82
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
83 fs_node_t *readdir(fs_node_t *dir, int index)
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
84 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
85 if (index >= dir->length)
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
86 {
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
87 return 0;
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
88 }
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
89 }
43
e47bfef80baf Fixed build by commenting out initrd code
windel
parents: 41
diff changeset
90 */
41
35cc54e078dd Added memory functions
windel
parents: 32
diff changeset
91