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ramdisk.htm
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<div class=Section1>
<h2><span style='font-family:Verdana'>Driver Framework Ramdisk Sample Driver<o:p></o:p></span></h2>
<h3><span style='font-size:14.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>SUMMARY<o:p></o:p></span></h3>
<p class=MsoBodyText>This sample demonstrates how to write a PnP software only function driver using Windows Driver Framework. This driver creates a RAM disk drive of the specified
size. This Ramdisk can be used like any other disk, but the contents of the
disk will be lost when the machine is shutdown. Generally the Windows<span
style='mso-bidi-font-size:10.0pt'>®</span> cache manager does a much
better job of optimizing memory usage than using a Ramdisk.</p>
<h4><span style='font-size:14.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>Forward Progress <o:p></o:p></span></h4>
<p class=MsoBodyText> <span style='mso-tab-count:2'> </span> This sample also demonstrates how to add forward progress support in your driver. It shows
how to configure a queue for forward progress, the different forward progress callbacks and the forward progress policies.
Please refer to the WDK documenation for more information on the callbacks.
</p>
<p><span style='font-size:10.0pt;font-family:Verdana'>The driver building and
installation instructions given here apply only to Windows® 2000 and later operating systems.<o:p></o:p></span></p>
<p><b><span style='font-size:10.0pt;font-family:Verdana'>Note</span></b><span
style='font-size:10.0pt;font-family:Verdana'>: This sample provides an example
of a minimal driver. Neither the driver nor the sample programs are intended
for use in a production environment. Rather, they are intended for educational
purposes and as a skeleton driver.<o:p></o:p></span></p>
<h3><span style='font-size:14.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>Building
the Sample<o:p></o:p></span></h3>
<p><span style='font-size:10.0pt;font-family:Verdana'>Click the Free Build
Environment or Checked Build Environment icon under your <b>Development Kits </b>program
group to set basic environment variables needed by the build utility. <o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>Change to the directory
containing the device source code, such as <b>src\storage\Ramdisk</b><o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>Run <b>build -ceZ</b>, or
use the macro <b>BLD</b>. This behavior invokes the Microsoft make routines
that produce log files called Buildxxx.log, and also Buildxxx.wrn and
Buildxxx.err if there are any warnings or errors. Where xxx stands for <b>fre</b>
or <b>chk</b> depending on the environment chosen. If the build succeeds, the
driver wdframdisk.sys and the generated inf file ramdisk.inf will be placed in the binary output directory specified for the build environment. You can get the output path from the buildxxx.log file..<o:p></o:p></span></p>
<h4><span style='font-size:14.0pt;mso-bidi-font-size:12.0pt;font-family:Verdana'>Installing
the Sample<o:p></o:p></span></h4>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:Verdana;color:black'>To install the driver
on Windows 2000: <o:p></o:p></span></p>
<ol start=1 type=1>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l3 level1 lfo4;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Double-click the Add New Hardware Wizard
applet in Control Panel. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l3 level1 lfo4;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Click Next. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l3 level1 lfo4;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Select Add a new device. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l3 level1 lfo4;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Select No, I Want to Select the Hardware from
a list. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l3 level1 lfo4;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Select Other Devices and then click Next. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l3 level1 lfo4;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Click Have Disk and point to the directory
that contains wdframdisk.sys, RAMDISK.inf and the KMDF coinstaller (wdfcoinstallerMMmmm.dll) file.
<b>NOTE</b>: You will need to manually copy the coinstaller (wdfcoinstallerMMmmm.dll) file from %wdkroot%\redist\wdf\(platform specific) folder to your install folder.<o:p></o:p></span></li>
</ol>
<p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:Verdana;
color:black'>To install the bus driver on Windows XP and later operating systems: <o:p></o:p></span></p>
<ol start=1 type=1>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Double-click the Add Hardware wizard in
Control Panel. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>At the 'Welcome to the Add Hardware Wizard',
click Next. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Select 'Yes, I have already connected the
hardware', then click Next. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Select Add a new hardware device from the
list, then click Next. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Select Install the hardware that I manually
select from a list(Advanced),' and then click next. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Select Show All Devices, then click Next. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Click 'Have Disk', make sure that 'A:\' is in
the "Copy manufacturer's files from:" box, and click OK. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Click on the desired entry, and then click
Next. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>At 'The wizard is ready to install your
hardware', click Next. <o:p></o:p></span></li>
<li class=MsoNormal style='color:black;mso-margin-top-alt:auto;mso-margin-bottom-alt:
auto;mso-list:l1 level1 lfo5;tab-stops:list .5in'><span style='font-size:
10.0pt;font-family:Verdana'>Click Finish at 'Completing the Add/Remove
Hardware Wizard.' <o:p></o:p></span></li>
</ol>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span
style='font-size:10.0pt;font-family:Verdana;color:black'>Alternatively, you can
use the DEVCON.EXE from the DDK to install the driver programmatically.<o:p></o:p></span></p>
<p><b><span style='font-size:10.0pt;font-family:Verdana'>c:\>DEVCON.EXE
INSTALL ramdisk.inf ramdisk</span></b><span style='font-size:10.0pt;font-family:
Verdana'><o:p></o:p></span></p>
<p><span style='font-size:10.0pt;font-family:Verdana'>The system copies the
WdfRamdisk.sys file to %systemroot%\system32\drivers directory and loads the
driver. <o:p></o:p></span></p>
<h3><span style='font-size:12.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>Configuring
the </span><st1:Street><st1:address><span style='font-size:12.0pt;mso-bidi-font-size:
13.5pt;font-family:Verdana'>Ramdisk Drive</span></st1:address></st1:Street><span
style='font-size:12.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'><o:p></o:p></span></h3>
<h3><span style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana;
font-weight:normal'>The Ramdisk can be configured using the registry.<span
style='mso-spacerun:yes'> </span>The RAMDISK.INF file contains the default
values for all the configurable parameters.<span style='mso-spacerun:yes'>
</span>A brief description of each parameter follows:<o:p></o:p></span></h3>
<h3><span style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>BreakOnEntry</span><span
style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana;
font-weight:normal'><span style='mso-spacerun:yes'>
</span>REG_DWORD<span style='mso-spacerun:yes'> </span>0<o:p></o:p></span></h3>
<h3 style='margin-left:.5in'><span style='font-size:10.0pt;mso-bidi-font-size:
13.5pt;font-family:Verdana;font-weight:normal'>Boolean value, which determines
whether a break point will be generated during the DriverEntry routine.<span
style='mso-spacerun:yes'> </span>It has no effect in a free build of the
driver.<o:p></o:p></span></h3>
<h3><span style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>DebugLevel</span><span
style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana;
font-weight:normal'><span style='mso-spacerun:yes'>
</span>REG_DWORD<span style='mso-spacerun:yes'> </span>0<o:p></o:p></span></h3>
<h3 style='margin-left:.5in'><span style='font-size:10.0pt;mso-bidi-font-size:
13.5pt;font-family:Verdana;font-weight:normal'>This value specifies the level
of diagnostic messages produced.<span style='mso-spacerun:yes'> </span>Larger
values result in more verbose messages. It can take values from 0 to 3.<span
style='mso-spacerun:yes'> </span>It has no effect in a free build of the
driver. <o:p></o:p></span></h3>
<h3><span style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>DebugComp</span><span
style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana;
font-weight:normal'><span style='mso-spacerun:yes'>
</span>REG_DWORD<span style='mso-spacerun:yes'> </span>0xFFFFFFFF<o:p></o:p></span></h3>
<h3 style='margin-left:.5in'><span style='font-size:10.0pt;mso-bidi-font-size:
13.5pt;font-family:Verdana;font-weight:normal'>This value specifies the
components in which the debug messages to be printed. Each bit specifies the
component. See Debug.h for component list. It has no effect in a free build of
the driver. <o:p></o:p></span></h3>
<h3><span style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>DiskSize</span><span
style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana;
font-weight:normal'><span style='mso-spacerun:yes'>
</span>REG_DWORD<span style='mso-spacerun:yes'> </span>0x100000 (1,048,576
1Mb)<o:p></o:p></span></h3>
<h3 style='margin-left:.5in'><span style='font-size:10.0pt;mso-bidi-font-size:
13.5pt;font-family:Verdana;font-weight:normal'>The size of the Ramdisk drive in
bytes.<o:p></o:p></span></h3>
<h3><span style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>DriveLetter</span><span
style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana;
font-weight:normal'><span style='mso-spacerun:yes'> </span>REG_SZ<span
style='mso-spacerun:yes'> </span>Z:<o:p></o:p></span></h3>
<h3 style='margin-left:.5in'><span style='font-size:10.0pt;mso-bidi-font-size:
13.5pt;font-family:Verdana;font-weight:normal'>The default drive letter
associated with the Ramdisk drive.<o:p></o:p></span></h3>
<h3><span style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>RootDirEntries</span><span
style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana;
font-weight:normal'><span style='mso-spacerun:yes'> </span>REG_DWORD<span
style='mso-spacerun:yes'> </span>512<o:p></o:p></span></h3>
<h3 style='margin-left:.5in'><span style='font-size:10.0pt;mso-bidi-font-size:
13.5pt;font-family:Verdana;font-weight:normal'>The number of entries in the
root directory.<o:p></o:p></span></h3>
<h3><span style='font-size:10.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>SectorsPerCluster<span
style='mso-spacerun:yes'> </span></span><span style='font-size:10.0pt;
mso-bidi-font-size:13.5pt;font-family:Verdana;font-weight:normal'>REG_DWORD<span
style='mso-spacerun:yes'> </span>2<o:p></o:p></span></h3>
<h3 style='margin-left:.5in'><span style='font-size:10.0pt;mso-bidi-font-size:
13.5pt;font-family:Verdana;font-weight:normal'>The granularity of the allocation
unit.<o:p></o:p></span></h3>
<h3><span style='font-size:14.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'><o:p> </o:p></span></h3>
<h3><span style='font-size:14.0pt;mso-bidi-font-size:13.5pt;font-family:Verdana'>CODE
TOUR<o:p></o:p></span></h3>
<h4><span style='font-family:Verdana'>File Manifest<o:p></o:p></span></h4>
<pre><u>File<span style='mso-tab-count:2'> </span>Description<o:p></o:p></u></pre><pre><o:p> </o:p></pre>
<pre>Ramdisk.c<span style='mso-spacerun:yes'> </span>Source file for the Ramdisk sample driver</pre>
<pre>Ramdisk.h<span style='mso-spacerun:yes'> </span>Include file that contains the Ramdisk structures</pre>
<pre>forward_progress.c<span style='mso-spacerun:yes'> </span>Source file for forward progress</pre>
<pre>forward_progress.h<span style='mso-spacerun:yes'> </span>Include file that contains the forward progress structures</pre>
<pre>Sources<span style='mso-spacerun:yes'> </span>Generic file for building the code sample.</pre>
<pre>Ramdisk.inf<span style='mso-spacerun:yes'> </span>Installation file for installing the driver.</pre>
<pre>Ramdisk.htm<span style='mso-spacerun:yes'> </span>Sample Tour documentation for this sample (this file).</pre>
<h3 style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><span
style='font-family:Verdana'><o:p> </o:p></span></h3>
<p class=MsoBodyText style='tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2pt 687.0pt 732.8pt'><o:p> </o:p></p>
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