Initial POWER9 port of GNU Mach

[Tobias Alexandra Platen]

cd gnumach/power9

gdb ./mach_kernel 
GNU gdb (Debian 13.1-3) 13.1
Copyright (C) 2023 Free Software Foundation, Inc.
.....................................................
Program received signal SIGSEGV, Segmentation fault.
pset_sys_bootstrap () at kern/processor.c:84
84                      processor_init(processor_ptr(i), i);
(gdb) bt
#0  pset_sys_bootstrap () at kern/processor.c:84
#1  0x000000010004e1a8 in sched_init () at kern/sched_prim.c:171
#2  0x0000000100005df4 in setup_main () at kern/startup.c:114
#3  0x0000000100001f00 in main ()
(gdb)