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The source listing is preceded by a cross-reference that lists every defined
constant, struct, global variable, and function in xv6. Each entry gives,
on the same line as the name, the line number (or, in a few cases, numbers)
where the name is defined. Successive lines in an entry list the line
numbers where the name is used. For example, this entry:
swtch 2256
0311 1928 1962 2255
2256
indicates that swtch is defined on line 2256 and is mentioned on five lines
on sheets 03, 19, and 22.
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