void hd_geometry_guess(BlockBackend *blk, uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs, int *ptrans) { int cylinders, heads, secs, translation; if (guess_disk_lchs(blk, &cylinders, &heads, &secs) < 0) { /* no LCHS guess: use a standard physical disk geometry */ guess_chs_for_size(blk, pcyls, pheads, psecs); translation = hd_bios_chs_auto_trans(*pcyls, *pheads, *psecs); } else if (heads > 16) { /* LCHS guess with heads > 16 means that a BIOS LBA translation was active, so a standard physical disk geometry is OK */ guess_chs_for_size(blk, pcyls, pheads, psecs); translation = *pcyls * *pheads <= 131072 ? BIOS_ATA_TRANSLATION_LARGE : BIOS_ATA_TRANSLATION_LBA; } else { /* LCHS guess with heads <= 16: use as physical geometry */ *pcyls = cylinders; *pheads = heads; *psecs = secs; /* disable any translation to be in sync with the logical geometry */ translation = BIOS_ATA_TRANSLATION_NONE; } if (ptrans) { *ptrans = translation; } trace_hd_geometry_guess(blk, *pcyls, *pheads, *psecs, translation); }