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📄 developing a device driver.mht

📁 What is this ``device driver stuff anyway? Here s a very short introduction to the concept.
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  <P>
  <LI>Locking out interrupts when performing vulnerable operations=20
  <P></P>
  <LI>Not locking out interrupts for an extended period of time=20
  <P></P>
  <LI>Queueing the data so that the data-handling operation can be =
interrupted=20
  </LI></UL>
<P>
<P>Because the <TT>NONE</TT> device has no underlying physical hardware, =
it=20
cannot generate interrupts. Therefore, this part of the worksheet shown =
in <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut29.html#devcharac_wkshtfordevnone">Figure=20
C-5</A> is left blank. <A name=3DSpecHowDevReset></A>
<P>
<HR>

<P align=3Dcenter><A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/Digita=
l_UNIX_Bookshelf.html"><IMG=20
alt=3D"[Return to Library]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/BOOKSHELF.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/TOC.html"><IMG=20
alt=3D[Contents]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/TOC.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#DesSimple"><IMG=20
alt=3D"[Previous Chapter]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/REW.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#SpecActionsonInterrupts"><IMG=20
alt=3D"[Previous Section]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/PREV.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#OtherDevChar"><IMG=20
alt=3D"[Next Section]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/NEXT.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut6.html"><IMG=20
alt=3D"[Next Chapter]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/FF.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/INDEX.html"><IMG=20
alt=3D[Index]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/INDEX.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/HELP.h=
tml"><IMG=20
alt=3D[Help]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/HELP.GIF"=20
border=3D0></A>=20
<P>
<HR>

<P>
<H3>2.1.3.5&nbsp;&nbsp;&nbsp;&nbsp;Specifying How to Reset the Device =
</H3>
<P><A name=3Dnx_id_55></A><A name=3Dnx_id_56></A>If the bus that the =
device=20
controller is connected to supports the reset function, the device =
driver must=20
be able to stop all current work and place the device connected to the=20
controller in a known, quiescent state.=20
<P>For example purposes, the <TT>NONE</TT> device can be connected to =
the=20
TURBOchannel bus. To keep the example driver simple, the reset function =
will not=20
be implemented as part of the <TT>/dev/none</TT> device driver. Thus, =
the=20
worksheet shown in <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut29.html#devcharac2_wkshtfordevnone">Figure=20
C-6</A> indicates that this characteristic is of no concern to the=20
<TT>/dev/none</TT> device driver. <A name=3DOtherDevChar></A>
<P>
<HR>

<P align=3Dcenter><A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/Digita=
l_UNIX_Bookshelf.html"><IMG=20
alt=3D"[Return to Library]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/BOOKSHELF.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/TOC.html"><IMG=20
alt=3D[Contents]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/TOC.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#DesSimple"><IMG=20
alt=3D"[Previous Chapter]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/REW.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#SpecHowDevReset"><IMG=20
alt=3D"[Previous Section]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/PREV.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#descruse_ofdev"><IMG=20
alt=3D"[Next Section]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/NEXT.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut6.html"><IMG=20
alt=3D"[Next Chapter]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/FF.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/INDEX.html"><IMG=20
alt=3D[Index]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/INDEX.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/HELP.h=
tml"><IMG=20
alt=3D[Help]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/HELP.GIF"=20
border=3D0></A>=20
<P>
<HR>

<P>
<H3>2.1.3.6&nbsp;&nbsp;&nbsp;&nbsp;Specifying Other Device =
Characteristics </H3>
<P>Use this space to identify other characteristics of the device that =
might=20
influence how you design your device driver. The worksheet shown in <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut29.html#devcharac2_wkshtfordevnone">Figure=20
C-6</A> is left blank to indicate that there are no other device =
characteristics=20
associated with the <TT>NONE</TT> device. <A name=3Ddescruse_ofdev></A>
<P>
<HR>

<P align=3Dcenter><A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/Digita=
l_UNIX_Bookshelf.html"><IMG=20
alt=3D"[Return to Library]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/BOOKSHELF.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/TOC.html"><IMG=20
alt=3D[Contents]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/TOC.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#DesSimple"><IMG=20
alt=3D"[Previous Chapter]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/REW.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#OtherDevChar"><IMG=20
alt=3D"[Previous Section]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/PREV.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#ListDevDocs"><IMG=20
alt=3D"[Next Section]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/NEXT.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut6.html"><IMG=20
alt=3D"[Next Chapter]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/FF.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/INDEX.html"><IMG=20
alt=3D[Index]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/INDEX.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/HELP.h=
tml"><IMG=20
alt=3D[Help]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/HELP.GIF"=20
border=3D0></A>=20
<P>
<HR>

<P>
<H3>2.1.4&nbsp;&nbsp;&nbsp;&nbsp;Describing Device Usage </H3>
<P><A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut29.html#devuse_wkshtfordevnone">Figure=20
C-7</A> shows the device usage information for the <TT>NONE</TT> device=20
associated with the <TT>/dev/none</TT> driver. <A name=3Dnx_id_57></A>As =
the=20
worksheet shows, you gather the following information about device =
usage:=20
<UL>
  <P>
  <LI>The documentation you have on the device=20
  <P></P>
  <LI>The number of instances of this device type that can reside on the =
system=20
  <P></P>
  <LI>The purpose of the device </LI></UL>
<P><A name=3DListDevDocs></A>
<P>
<HR>

<P align=3Dcenter><A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/Digita=
l_UNIX_Bookshelf.html"><IMG=20
alt=3D"[Return to Library]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/BOOKSHELF.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/TOC.html"><IMG=20
alt=3D[Contents]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/TOC.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#DesSimple"><IMG=20
alt=3D"[Previous Chapter]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/REW.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#descruse_ofdev"><IMG=20
alt=3D"[Previous Section]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/PREV.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#SpecNumofDeviceTypes"><IMG=20
alt=3D"[Next Section]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/NEXT.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut6.html"><IMG=20
alt=3D"[Next Chapter]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/FF.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/INDEX.html"><IMG=20
alt=3D[Index]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/INDEX.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/HELP.h=
tml"><IMG=20
alt=3D[Help]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/HELP.GIF"=20
border=3D0></A>=20
<P>
<HR>

<P>
<H3>2.1.4.1&nbsp;&nbsp;&nbsp;&nbsp;Listing the Device Documentation =
</H3>
<P><A name=3Dnx_id_58></A>For a real device, you should have on hand the =
manual=20
for the device that is supplied by the manufacturer. The <TT>NONE</TT> =
device is=20
a fictitious device; therefore, this section of the worksheet shown in =
<A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut29.html#devuse_wkshtfordevnone">Figure=20
C-7</A> is left blank. <A name=3DSpecNumofDeviceTypes></A>
<P>
<HR>

<P align=3Dcenter><A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/Digita=
l_UNIX_Bookshelf.html"><IMG=20
alt=3D"[Return to Library]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/BOOKSHELF.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/TOC.html"><IMG=20
alt=3D[Contents]=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/TOC.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#DesSimple"><IMG=20
alt=3D"[Previous Chapter]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/REW.GIF"=20
border=3D0></A> <A=20
href=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUB=
VD-TE_html/drivertut5.html#ListDevDocs"><IMG=20
alt=3D"[Previous Section]"=20
src=3D"http://h30097.www3.hp.com/docs/base_doc/DOCUMENTATION/HTML/AA-PUBV=
D-TE_html/PREV.GIF"=20
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href=
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