Unit Instance

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        "We next build <filename>boot2.s</filename> from files <filename>boot2.h</filename>, <filename>boot2.c</filename> and <filename>/usr/src/sys/boot/common/ufsread.c</filename>. The rule for this is to compile the code in <filename>boot2.c</filename> (which includes <filename>boot2.h</filename> and <filename>ufsread.c</filename>) into assembly code. Having <filename>boot2.s</filename>, the next rule assembles <filename>boot2.s</filename>, creating the object file <filename>boot2.o</filename>. The next rule directs the linker to link various files (<filename>crt0.o</filename>, <filename>boot2.o</filename> and <filename>sio.o</filename>). Note that the output file, <filename>boot2.out</filename>, is linked to execute at address <literal>0x2000</literal>. Recall that <filename>boot2</filename> will be executed in user mode, within a special user segment set up by the <acronym>BTX</acronym> server. This segment starts at <literal>0xa000</literal>. Also, remember that the <filename>boot2</filename> portion of <filename>boot</filename> was copied to address <literal>0xc000</literal>, that is, offset <literal>0x2000</literal> from the start of the user segment, so <filename>boot2</filename> will work properly when we transfer control to it. Next, <filename>boot2.bin</filename> is created from <filename>boot2.out</filename> by stripping its symbols and format information; boot2.bin is a <emphasis>raw</emphasis> binary. Now, note that a file <filename>boot2.ldr</filename> is created as a 512-byte file full of zeros. This space is reserved for the bsdlabel."
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