smp: Replace QEMU SMP init assembler code with C; run only in 32bit mode.

Change the multi-processor init code to trampoline into 32bit mode on
each of the additional processors.  Implement an atomic lock so that
each processor performs its initialization serially.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
5 files changed