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Merge common XPT_CALC_GEOMETRY functions into a single convenience function.

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Devices below may experience a change in geometry.

* Due to a bug, aic(4) never used extended geometry.  Changes all drives
  >1G to now use extended translation.
* sbp(4) drives exactly 1 GB in size now no longer use extended geometry.
* umass(4) drives exactly 1 GB in size now no longer use extended geometry.

For all other controllers in this commit, this should be a no-op.

PR:
Submitted by:
Looked over by:	scottl
Approved by:
Obtained from:
MFC after:
This commit is contained in:
njl 2003-06-14 22:17:38 +00:00
parent af2401690b
commit c996d2bc71
2 changed files with 27 additions and 0 deletions
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25
sys/cam/cam.c
View File

@ -360,3 +360,28 @@ cam_error_print(struct cam_device *device, union ccb *ccb,
}
#endif /* _KERNEL/!_KERNEL */
/*
* Common calculate geometry fuction
*
* Caller should set ccg->volume_size and block_size.
* The extended parameter should be zero if extended translation
* should not be used.
*/
void
cam_calc_geometry(struct ccb_calc_geometry *ccg, int extended)
{
uint32_t size_mb, secs_per_cylinder;
size_mb = ccg->volume_size / ((1024L * 1024L) / ccg->block_size);
if (size_mb > 1024 && extended) {
ccg->heads = 255;
ccg->secs_per_track = 63;
} else {
ccg->heads = 64;
ccg->secs_per_track = 32;
}
secs_per_cylinder = ccg->heads * ccg->secs_per_track;
ccg->cylinders = ccg->volume_size / secs_per_cylinder;
ccg->ccb_h.status = CAM_REQ_CMP;
}

2
sys/cam/cam_ccb.h
View File

@ -979,6 +979,8 @@ cam_fill_ctio(struct ccb_scsiio *csio, u_int32_t retries,
csio->init_id = init_id;
}
void cam_calc_geometry(struct ccb_calc_geometry *ccg, int extended);
__END_DECLS
#endif /* _CAM_CAM_CCB_H */