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);
}
bool blkconf_geometry(BlockConf *conf, int *ptrans,
unsigned cyls_max, unsigned heads_max, unsigned secs_max,
Error **errp)
{
DriveInfo *dinfo;
if (!conf->cyls && !conf->heads && !conf->secs) {
/* try to fall back to value set with legacy -drive cyls=... */
dinfo = blk_legacy_dinfo(conf->blk);
if (dinfo) {
conf->cyls = dinfo->cyls;
conf->heads = dinfo->heads;
conf->secs = dinfo->secs;
if (ptrans) {
*ptrans = dinfo->trans;
}
}
}
if (!conf->cyls && !conf->heads && !conf->secs) {
hd_geometry_guess(conf->blk,
&conf->cyls, &conf->heads, &conf->secs,
ptrans);
} else if (ptrans && *ptrans == BIOS_ATA_TRANSLATION_AUTO) {
*ptrans = hd_bios_chs_auto_trans(conf->cyls, conf->heads, conf->secs);
}
if (conf->cyls || conf->heads || conf->secs) {
if (conf->cyls < 1 || conf->cyls > cyls_max) {
error_setg(errp, "cyls must be between 1 and %u", cyls_max);
return false;
}
if (conf->heads < 1 || conf->heads > heads_max) {
error_setg(errp, "heads must be between 1 and %u", heads_max);
return false;
}
if (conf->secs < 1 || conf->secs > secs_max) {
error_setg(errp, "secs must be between 1 and %u", secs_max);
return false;
}
}
return true;
}
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);
}
