Mercurial > lcfOS
annotate cos/kernel/initrd.c @ 374:72a3b646d543
Added if statement sample
| author | Windel Bouwman |
|---|---|
| date | Fri, 21 Mar 2014 15:27:18 +0100 |
| parents | e47bfef80baf |
| children |
| rev | line source |
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Added initial ramdisk and some virtual file system functions
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1 /* |
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2 * Initial ramdisk filesystem driver. |
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3 * */ |
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4 |
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5 #include "kernel.h" |
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6 |
| 41 | 7 // Global data struct: |
| 43 | 8 //initrd_file_header_t *files; |
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9 |
| 43 | 10 /* |
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11 fs_node_t* initialize_initrd(uint64_t location) |
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12 { |
| 41 | 13 uint32_t *u32ptr; |
| 14 | |
| 15 u32ptr = (uint32_t*)location; | |
| 16 if (*u32ptr != 0x1337babe) | |
| 17 { | |
| 18 printf("Invalid ramdisk magic\n"); | |
| 19 return 0; | |
| 20 } | |
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21 |
| 41 | 22 // Allocate root dir: |
| 23 fs_node_t *root = (fs_node_t*)kmalloc(sizeof(fs_node_t)); | |
| 24 memset(root, 0, sizeof(fs_node_t)); | |
| 25 root->flags = FS_DIRECTORY; | |
| 26 root->readdir = initrd_readdir; | |
| 27 | |
| 28 u32ptr++; | |
| 29 root->length = *u32ptr; | |
| 30 | |
| 31 // Allocate an node for each file. | |
| 32 void *x = kmalloc(sizeof(fs_node_t) * root->length); | |
| 33 memset(x, 0, sizeof(fs_node_t) * root->length); | |
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34 |
| 41 | 35 for (i = 0; i < root->length; i++) |
| 36 { | |
| 37 | |
| 38 } | |
| 39 | |
| 40 return root; | |
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41 } |
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42 |
| 43 | 43 */ |
| 44 | |
| 41 | 45 void load_ramdisk() |
| 46 { | |
| 47 printf("Ramdisk location: %p\n", ramdisk_location); | |
| 48 | |
| 43 | 49 /* |
| 41 | 50 fs_node_t *root = initialize_initrd(ramdisk_location); |
| 51 | |
| 52 if (root != 0) | |
| 53 { | |
| 54 fs_node_t *node = 0; | |
| 55 int i = 0; | |
| 56 while ( (node = readdir_fs(root, i)) != 0) | |
| 57 { | |
| 58 printf("File %s\n", node->name); | |
| 59 } | |
| 60 } | |
| 43 | 61 */ |
| 41 | 62 } |
| 63 | |
| 43 | 64 /* |
| 41 | 65 static uint64_t initrd_read(fs_node_t *node, uint64_t offset, uint64_t size, void *buffer) |
| 66 { | |
| 67 // TODO: check errors | |
| 68 | |
| 69 if (size > node->length) | |
| 70 { | |
| 71 return 0; | |
| 72 } | |
| 73 | |
| 74 if (size + offset > node->length) | |
| 75 { | |
| 76 size = node->length - offset; | |
| 77 } | |
| 78 | |
| 79 memcpy(buffer, node.data + offset, size); | |
| 80 return size; | |
| 81 } | |
| 82 | |
| 83 fs_node_t *readdir(fs_node_t *dir, int index) | |
| 84 { | |
| 85 if (index >= dir->length) | |
| 86 { | |
| 87 return 0; | |
| 88 } | |
| 89 } | |
| 43 | 90 */ |
| 41 | 91 |