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author | njl <njl@FreeBSD.org> | 2003-06-14 22:17:38 +0000 |
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committer | njl <njl@FreeBSD.org> | 2003-06-14 22:17:38 +0000 |
commit | b184633199beba93ad13f46cf12a67fbaa20ad06 (patch) | |
tree | 5752708c01d3bc91355e1bfb4660548fdad1e887 /sys/cam/cam.c | |
parent | 9dc1a1166f0a73431cabc077b5f45d5042a753c1 (diff) | |
download | FreeBSD-src-b184633199beba93ad13f46cf12a67fbaa20ad06.zip FreeBSD-src-b184633199beba93ad13f46cf12a67fbaa20ad06.tar.gz |
Merge common XPT_CALC_GEOMETRY functions into a single convenience function.
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:
Diffstat (limited to 'sys/cam/cam.c')
-rw-r--r-- | sys/cam/cam.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/sys/cam/cam.c b/sys/cam/cam.c index 0c76d96..b84132d 100644 --- a/sys/cam/cam.c +++ b/sys/cam/cam.c @@ -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; +} |