powerpc/booke: Add a machine check stackHEADmain

Machine check and critical exceptions are independent of each other, and
can interrupt each other.  Since they're asynchronous we cannot trust
that the existing stack pointer (%r1) is correct at time of entry, so
add a private machine check stack separate from the critical exception
stack.  As part of this, switch to the STANDARD_CRIT_PROLOG() for
machine check exceptions, and overload the macro to specify the stack to
switch to.  Also add a savearea argument to CRIT_SRR_RESTORE() so that
we can restore machine check exception state from the right location.

0 files changed, 0 insertions, 0 deletions