The line numbers in the book reference a 92-page printout of the source code here: http://pdos.csail.mit.edu/6.828/2012/xv6/xv6-rev7.pdf http://pdos.csail.mit.

The line numbers in the book reference a 92-page printout of the source code here: http://pdos.csail.mit.edu/6.828/2012/xv6/xv6-rev7.pdf http://pdos.csail.mit.edu/6.828/2012/xv6/xv6-rev7.pdf