void hd_geometry_guess(BlockDriverState *bs,
uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
int *ptrans)
{
int cylinders, heads, secs, translation;
if (guess_disk_lchs(bs, &cylinders, &heads, &secs) < 0) {
/* no LCHS guess: use a standard physical disk geometry */
guess_chs_for_size(bs, 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(bs, 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(bs, *pcyls, *pheads, *psecs, translation);
}
void hd_geometry_guess(BlockBackend *blk,
uint32_t *pcyls, uint32_t *pheads, uint32_t *psecs,
int *ptrans)
{
int cylinders, heads, secs, translation;
HDGeometry geo;
/* Try to probe the backing device geometry, otherwise fallback
to the old logic. (as of 12/2014 probing only succeeds on DASDs) */
if (blk_probe_geometry(blk, &geo) == 0) {
*pcyls = geo.cylinders;
*psecs = geo.sectors;
*pheads = geo.heads;
translation = BIOS_ATA_TRANSLATION_NONE;
} else 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);
}
