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<chapter id="intro">
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<chapter id="intro">
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  <?dbhtml filename="intro.html" ?>
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  <?dbhtml filename="intro.html" ?>
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  <title>Introduction</title>
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  <title>Introduction</title>
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  <para>This book describes the design and principles of the HelenOS operating
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  <para>This book describes the design and principles of the HelenOS operating
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  system from the perspective of its microkernel as well as from the
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  system from the perspective of its microkernel as well as from the
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  perspective of its userspace drivers and server tasks. Its primary goal is
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  perspective of its userspace drivers and server tasks. Its primary goal is
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  to present ideas behind each subsystem and highlight things that are
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  to present ideas behind each subsystem and highlight things that are
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  specific to HelenOS. Although this text contains references to source code
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  specific to HelenOS. Although this text contains references to source code
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  (e.g. function names), these are provided only to improve reader's
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  (e.g. function names), these are provided only to improve reader's
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  orientation when reading the code. This book does not attempt to be a
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  orientation when reading the code. This book does not attempt to be a
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  substitute for a reference manual and the reader is strongly encouraged to
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  substitute for a reference manual and the reader is strongly encouraged to
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  look for interface details there.</para>
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  look for interface details there.</para>
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  <section>
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  <section>
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    <title>How to read this book</title>
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    <title>How to Read This Book</title>
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    <para><xref linkend="architecture" /> contains overview of the overall
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    HelenOS architecture.</para>
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    <para><xref linkend="ds" /> describes essential data structures used both
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    in the kernel and in the userspace.</para>
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    <para><xref linkend="time" /> focuses on time management in the kernel and
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    scheds some light on the userspace source of time.</para>
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    <para><xref linkend="scheduling" /> is dedicated to threads and the
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    scheduling subsystem.</para>
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    <para><xref linkend="mm" /> describes memory management of physical and
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    virtual memory.</para>
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    <para><xref linkend="architecture" /> contains overview of the overall HelenOS architecture.</para>
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    <para><xref linkend="ds" /> describes essential data structures used both in the kernel and in the userspace.</para>
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    <para><xref linkend="time" /> focuses on time management in the kernel and scheds some light on the userspace source of time.</para>
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    <para><xref linkend="scheduling" /> is dedicated to threads and the scheduling subsystem.</para>
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    <para><xref linkend="mm" /> describes memory management of physical and virtual memory.</para>
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    <para><xref linkend="ipc" /> deals with the IPC subsystem.</para>
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    <para><xref linkend="ipc" /> deals with the IPC subsystem.</para>
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    <para><xref linkend="hardware" /> describes facilities that a userspace task can use in order to become a device driver.</para>
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    <para><xref linkend="hardware" /> describes facilities that a userspace
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    task can use in order to become a device driver.</para>
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    <para><xref linkend="archspecs" /> presents some architecture specific issues.</para>
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    <para><xref linkend="archspecs" /> presents some architecture specific
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    issues.</para>
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  </section>
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  </section>
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</chapter>
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</chapter>