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disk: Readd readback detection method as fallback

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mintsuki 2021-09-02 01:31:36 +02:00
parent 25e119496e
commit 1a71851c7d
1 changed files with 51 additions and 0 deletions
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51
stage23/drivers/disk.s2.c
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@ -255,6 +255,57 @@ struct volume *disk_volume_from_efi_handle(EFI_HANDLE efi_handle) {
}
}
// Fallback to read-back method
EFI_GUID disk_io_guid = DISK_IO_PROTOCOL;
EFI_DISK_IO *disk_io = NULL;
status = gBS->HandleProtocol(efi_handle, &disk_io_guid, (void **)&disk_io);
if (status)
return NULL;
uint64_t signature = BUILD_ID;
uint64_t orig;
status = disk_io->ReadDisk(disk_io, block_io->Media->MediaId, 0, sizeof(uint64_t), &orig);
if (status) {
return NULL;
}
status = disk_io->WriteDisk(disk_io, block_io->Media->MediaId, 0, sizeof(uint64_t), &signature);
if (status) {
return NULL;
}
struct volume *ret = NULL;
for (size_t i = 0; i < volume_index_i; i++) {
uint64_t compare;
EFI_DISK_IO *cur_disk_io = NULL;
gBS->HandleProtocol(volume_index[i]->efi_handle,
&disk_io_guid, (void **)&cur_disk_io);
cur_disk_io->ReadDisk(cur_disk_io,
volume_index[i]->block_io->Media->MediaId,
0 + volume_index[i]->first_sect * 512,
sizeof(uint64_t), &compare);
if (compare == signature) {
ret = volume_index[i];
break;
}
}
status = disk_io->WriteDisk(disk_io, block_io->Media->MediaId, 0, sizeof(uint64_t), &orig);
if (status) {
return NULL;
}
if (ret != NULL) {
return ret;
}
printv("Failed to match handle %X (2)\n", efi_handle);
return NULL;