diff options
| -rw-r--r-- | core/diskio.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/core/diskio.c b/core/diskio.c index 911e4ddf..eddcd8d8 100644 --- a/core/diskio.c +++ b/core/diskio.c @@ -254,14 +254,20 @@ struct disk *disk_init(uint8_t devno, bool cdrom, sector_t part_start, if (cdrom || (!(oreg.eflags.l & EFLAGS_CF) && oreg.ebx.w[0] == 0xaa55 && (oreg.ecx.b[0] & 1))) { + ebios = true; + /* Query EBIOS parameters */ + edd_params.len = sizeof edd_params; + ireg.eax.b[1] = 0x48; ireg.ds = SEG(&edd_params); ireg.esi.w[0] = OFFS(&edd_params); __intcall(0x13, &ireg, &oreg); if (!(oreg.eflags.l & EFLAGS_CF) && oreg.eax.b[1] == 0) { - ebios = true; + if (edd_params.len < sizeof edd_params) + memset((char *)&edd_params + edd_params.len, 0, + sizeof edd_params - edd_params.len); if (edd_params.sector_size >= 512 && is_power_of_2(edd_params.sector_size)) sector_size = edd_params.sector_size; |