3 realemu \- software emulation of /dev/realmode
17 Originally, kernel provided
21 device to access and call the
24 Interrupts had to be disabled and the processor was switched in the
27 with memory protection disabled to execute
31 This is problematic in case the
33 reprograms hardware currently
34 used by the operating system or when it reenables interrupts or just
35 crashes. This will freeze or reboot the machine with no way to
36 recover or diagnose the problem.
40 is used to emulate the execution of the
42 routines by interpreting the machine instructions and intercepting
43 dangerous actions that would compromise the systems stability.
47 with no arguments, it mounts itself before
52 file in the current namespace.
56 can use it to make ther
62 flag will enable debug messages for 9P. The
67 control tracing of i/o port access and cpu instructions to
80 that can be used to mount
81 the filesystem from another namespace. If a
86 argument then it is ignored, otherwise it will be used.
90 process is only needed when accessing
92 To invoke a subshell so that
99 % @{rfork n; aux/realemu; aux/vga -m vesa -l $vgasize}
101 .B /sys/src/cmd/aux/realemu