Tidy up locking and memory allocation for the real mode emulator wrapper. Now we use a regular mutex instead of a spin mutex.  When we enter and exit the emulator, spinlock_enter() and spinlock_exit() are additionally used. Move some page table related stuff from x86bios_init() and x86bios_uninit() to x86bios_map_mem() and x86bios_unmap_mem().
Tidy up locking and memory allocation for the real mode emulator wrapper.
Now we use a regular mutex instead of a spin mutex.  When we enter and exit
the emulator, spinlock_enter() and spinlock_exit() are additionally used.
Move some page table related stuff from x86bios_init() and x86bios_uninit()
to x86bios_map_mem() and x86bios_unmap_mem().

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase