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<title>C.5 Using -runtime os20</title>
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<a name="1142998"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">C.5 Using -runtime os20</font>
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<a name="1142999"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">A new feature added in R1.7 was the ability to specify a run-time system when linking a program. The default run-time system is <font size=2 face=Courier><strong>c</strong></font>, which provides a basic C run-time system. However OS20 can also be used as a run-time, in which case much of the initialization which a user had to perform in previous versions is performed automatically.</font>
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<a name="1143000"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">In general <font size=2 face=Courier><strong>-runtime os20</strong></font> is most useful when developing new programs. However there are a few simple steps which can be used to convert existing code to use <font size=2 face=Courier><strong>-runtime os20</strong></font>. Much of the initialization which is present in existing programs must be removed. In particular:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143001"> </a>calls to <font size=2 face=Courier><strong>interrupt_init_controller()</strong></font>, <font size=2 face=Courier><strong>kernel_initialize()</strong></font> and <font size=2 face=Courier><strong>kernel_start()</strong></font> must be removed,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143002"> </a>any definitions and initialization of <font size=2 face=Courier><strong>internal_partition</strong></font> and <font size=2 face=Courier><strong>system_partition</strong></font> must be removed,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143003"> </a>any calls to <font size=2 face=Courier><strong>debugsetmutexfn()</strong></font> to set up a debug mutex can be removed, as one will be installed automatically,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1143004"> </a>any calls to <font size=2 face=Courier><strong>setstdiofiletablemutexfn()</strong></font> and <font size=2 face=Courier><strong>setstdiomutexfn()</strong></font> can be removed, as one will be installed automatically.</font></p>
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<a name="1143005"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">In addition the <strong>chip</strong> command must be used in the configuration file when linking the program.</font>
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