In particular, for a given platform (x86, AMD64...) its definition
depends for uniprocessor vs. multiprocessor NT kernel/HAL (controlled
by the CONFIG_SMP define).
Regarding the ASM-generated headers (from asm/ksx.template.h), since
they are generated once for a given platform, and since UP/MP NT builds
are generated at the same time, these headers need to contain both
SYNCH_LEVEL definitions controlled by CONFIG_SMP, instead of a fixed
value. Therefore we need to employ the geninc RAW(...) construct.
[NDK:X86] Add missing x86 CLOCK1_LEVEL and POWER_LEVEL definitions.
KiSetTrapContext is an asm wrapper around RtlSetUnwindContext, which first stores an exception frame to assure that all non-volatile registers were put on the stack, then calls RtlSetUnwindContext to update their first saving positions on the stack and finally restore the exception frame to potentially load any updated registers, that haven't been saved elsewhere on the stack.
