sd man page on Inferno

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SD(3)									 SD(3)

NAME
       sd - storage device interface

SYNOPSIS
       bind #S /dev

       /dev/sdCu/ctl
       /dev/sdCu/raw
       /dev/sdCu/data
       ...

DESCRIPTION
       The storage device interface serves a two-level directory giving access
       to multiple storage units, typically ATA(PI) or SCSI discs.  Each  unit
       is accessed via files in the directory named by the controller to which
       it is attached, C, and by its unit number  u.   The  controller	naming
       convention  for	ATA(PI)	 units	starts with the first controller being
       named the second etc. up to a maximum of 4 controllers ([C-F]);	legacy
       controllers  are always 'C' and 'D'.  There can be a maximum of 2 units
       per ATA(PI) controller ([01]).  The controller  naming  convention  for
       SCSI units starts with the first controller being named the second etc.
       up to a maximum of 16 controllers ([0-9a-f]).  There can be  a  maximum
       of 16 units per SCSI controller ([0-9a-f]).

       Units are not accessed before the first attach.	Units may be individu‐
       ally attached using the attach specifier, for example

	      bind -a '#SsdD0' /dev

       An attach without a specifier will cause the driver  to	scan  for  all
       possible units before processing the rest of the name.

       The  subdirectory  for  each  unit contains two files, ctl and raw.  In
       addition, if the unit is a direct-access disc of some type  it  may  be
       split  into partitions and the subdirectory may contain a file per par‐
       tition.	By default, the partition data will exist for such media.

       Partitions are added and deleted by writing to the ctl file

	      part name start-sector end-sector
	      delpart name

       The default data partition may  be  deleted.   A	 partition  cannot  be
       deleted	if  a  process has it open.  If a change of removable media is
       detected, the new media cannot be opened until all open	partitions  on
       the old media are closed.

       Reading	the  ctl file returns at least one line of textual information
       about the unit.	The first line will always be prefixed by inquiry  and
       will give a manufacturer and model number if possible.  A line prefixed
       by config will be returned for  appropriate  media,  e.g.  for  ATA(PI)
       units the remainder of the line contains configuration information from
       the device's identify command (config and capabilities)	and  also  the
       available  I/O transfer options; this is a diagnostic aid.  A line pre‐
       fixed by geometry will be returned for appropriate media; at least  two
       numbers will follow, the first being the number of sectors contained in
       the unit and the second the sector size in bytes.  Any remaining infor‐
       mation  on  the	geometry  line	is unit-dependent, for instance, head,
       cylinder and sector counts  for	ATA  discs.   If  any  partitions  are
       defined	for the media, their name, start-sector and end-sector will be
       returned, prefixed by part.

	      % cat /dev/sdD0/ctl
	      inquiry KENWOOD CD-ROM UCR-421  208E10/20/99  7.39  2 M0
	      config 85C0 capabilities 0F00 dma 00550004 dmactl 00000000
	      geometry 242725 2352
	      part data 0 242725
	      %

       The use of DMA and multi-sector read/write commands may be enabled  and
       disabled	 on  ATA(PI)  units  by	 writing  to  the ctl file dma and rwm
       respectively followed by on or off.  For example, to enable  DMA	 on  a
       unit that supports it:

	      % echo 'dma on'>/dev/sd00/ctl

       If supported by the unit, the standby timer may be enabled:

	      % echo 'standby T'>/dev/sdC0/ctl

       where  T	 is the standby timer period in seconds.  T must be between 30
       and 1200, or can be 0 to disable the timer.

       The raw file is used to execute an arbitrary command on the unit	 at  a
       low  level.  This is used by programs to manipulate devices that do not
       fit the simple storage model or using special commands for  maintenance
       purposes.  The following steps may be used to execute a command

	      - Write the command to the raw file;

	      -	 Read  or write data associated with the command, according to
	      the direction of the transfer.

	      - Read the raw file to  retrieve	the  status  of	 the  command,
	      returned as a text integer.

SOURCE
       /os/port/devsd.c
       /os/*/sd*.[hc]

SEE ALSO
       ds(3), floppy(3)

BUGS
       Still in development.

       No LUNs.

       The 4 controller limit for ATA(PI) is not enforced.

       No  account  is	taken  of  some	 buggy ATA PCI controllers such as the
       CMD640.

       ATA(PI) units come up with DMA and multi-sector	read/write  capability
       disabled.

									 SD(3)
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