refactor: full rewrite of signal feature
[lunaix-os.git] / lunaix-os / kernel / fs / probe_boot.c
1 #include <lunaix/fs/iso9660.h>
2 #include <lunaix/fs/probe_boot.h>
3 #include <lunaix/mm/valloc.h>
4 #include <lunaix/syslog.h>
5
6 LOG_MODULE("PROBE")
7
8 #define LUNAIX_ID 0x414e554cUL // "LUNA"
9
10 struct device*
11 probe_boot_medium()
12 {
13     struct device* block_cat = device_getbyname(NULL, "block", 5);
14     if (!block_cat) {
15         return NULL;
16     }
17
18     struct iso_vol_primary* volp = valloc(ISO9660_BLKSZ);
19
20     struct device *pos, *n;
21     llist_for_each(pos, n, &block_cat->children, siblings)
22     {
23         int errno =
24           pos->read(pos, (void*)volp, ISO9660_READ_OFF, ISO9660_BLKSZ);
25         if (errno < 0) {
26             kprintf(KWARN "can not probe %x:%s (%d)\n",
27                     pos->dev_id,
28                     pos->name.value,
29                     errno);
30             pos = NULL;
31             goto done;
32         }
33
34         if (*(u32_t*)volp->header.std_id != ISO_SIGNATURE_LO) {
35             continue;
36         }
37
38         if (*(u32_t*)volp->sys_id == LUNAIX_ID) {
39             kprintf(KINFO "[%x:%s] %s\n",
40                     pos->dev_id,
41                     pos->name.value,
42                     (char*)volp->vol_id);
43             break;
44         }
45     }
46
47 done:
48     vfree(volp);
49     return pos;
50 }