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1 | <?xml version="1.0" encoding="UTF-8"?> |
1 | <?xml version="1.0" encoding="UTF-8"?> |
2 | <chapter id="intro"> |
2 | <chapter id="intro"> |
3 | <?dbhtml filename="intro.html" ?> |
3 | <?dbhtml filename="intro.html" ?> |
4 | 4 | ||
5 | <title>Introduction</title> |
5 | <title>Introduction</title> |
6 | 6 | ||
- | 7 | <para>HelenOS is a portable operating system with support for a variety of modern |
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- | 8 | processor architectures<footnote> |
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- | 9 | <para>amd64, ia32, ia64, mips32 and ppc32.</para> |
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- | 10 | </footnote>.</para> |
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- | 11 | ||
7 | <para>This book describes the design and principles of the HelenOS operating |
12 | <para>This book describes the design and principles of the HelenOS operating |
8 | system from the perspective of its microkernel as well as from the |
13 | system from the perspective of its microkernel as well as from the |
9 | perspective of its userspace drivers and server tasks. Its primary goal is |
14 | perspective of its userspace drivers and server tasks. Its primary goal is |
10 | to present ideas behind each subsystem and highlight things that are |
15 | to present ideas behind each subsystem and highlight things that are |
11 | specific to HelenOS. Although this text contains references to source code |
16 | specific to HelenOS. Although this text contains references to source code |
12 | (e.g. function names), these are provided only to improve reader's |
17 | (e.g. function names), these are provided only to improve reader's |
13 | orientation when reading the code. This book does not attempt to be a |
18 | orientation when reading the code. This book does not attempt to be a |
14 | substitute for a reference manual and the reader is strongly encouraged to |
19 | substitute for a reference manual and the reader is strongly encouraged to |
15 | look for interface details there.</para> |
20 | look for interface details there.</para> |
16 | 21 | ||
17 | <section> |
22 | <section> |
18 | <title>How to Read This Book</title> |
23 | <title>How to Read This Book</title> |
19 | 24 | ||
20 | <para><xref linkend="architecture" /> contains overview of the overall |
25 | <para><xref linkend="architecture" /> contains overview of the overall |
21 | HelenOS architecture.</para> |
26 | HelenOS architecture.</para> |
22 | 27 | ||
23 | <para><xref linkend="ds" /> describes essential data structures used both |
28 | <para><xref linkend="ds" /> describes essential data structures used both |
24 | in the kernel and in the userspace.</para> |
29 | in the kernel and in the userspace.</para> |
25 | 30 | ||
26 | <para><xref linkend="time" /> focuses on time management in the kernel and |
31 | <para><xref linkend="time" /> focuses on time management in the kernel and |
27 | scheds some light on the userspace source of time.</para> |
32 | scheds some light on the userspace source of time.</para> |
28 | 33 | ||
29 | <para><xref linkend="scheduling" /> is dedicated to threads and the |
34 | <para><xref linkend="scheduling" /> is dedicated to threads and the |
30 | scheduling subsystem.</para> |
35 | scheduling subsystem.</para> |
31 | 36 | ||
32 | <para><xref linkend="mm" /> describes memory management of physical and |
37 | <para><xref linkend="mm" /> describes memory management of physical and |
33 | virtual memory.</para> |
38 | virtual memory.</para> |
34 | 39 | ||
35 | <para><xref linkend="ipc" /> deals with the IPC subsystem.</para> |
40 | <para><xref linkend="ipc" /> deals with the IPC subsystem.</para> |
36 | 41 | ||
37 | <para><xref linkend="hardware" /> describes facilities that a userspace |
42 | <para><xref linkend="hardware" /> describes facilities that a userspace |
38 | task can use in order to become a device driver.</para> |
43 | task can use in order to become a device driver.</para> |
39 | 44 | ||
40 | <para><xref linkend="archspecs" /> presents some architecture specific |
45 | <para><xref linkend="archspecs" /> presents some architecture specific |
41 | issues.</para> |
46 | issues.</para> |
42 | </section> |
47 | </section> |
43 | </chapter> |
48 | </chapter> |