The problem is that the timespec structures now how 7 32-bit values before
them, which causes them to be implicitly padded on the Alpha (because the
timespecs have an alignment of 64 bits). However, the alignment constraints
changed if _POSIX_SOURCE was defined (thus replacing the timespecs with
time_ts and longs). This had no effect on 32-bit architectures, but changed
the offsets of several stat structure members on the Alpha.
XXX The ABI has not changed; explicit padding is added in the _POSIX_SOURCE
XXX case, enabled by an #ifdef __alpha__. This should be changed if the
XXX stat(2) ABI is ever changed again (e.g. if we change time_t to 64 bits).
with the syscall numbers changed.
Since 4.4BSD vfork(2) did not share address space, Ovfork.S could be changed
to be identical to fork.S (modulo syscall numbers). __vfork14.S, however,
needs to remain separate since with a shared address space, the stub needs to
pre-decrement the stack and do an indirect jump to the return address, so that
the shared stackframe is still there when the parent returns. (Obviously,
this does not apply to systems which to not build stackframes on leaf calls.)
3BSD vfork(2), i.e. share address space w/ parent and block parent.
Keep statistics on the total number of forks, the number of forks that
block the parent, and the number of forks that share the address space
with the parent.
Store the page {0,1} base and length registers in the pmap structure,
and implement pmap_activate(), which stores them in the PCB (for the
hardware's use).
- Re-implement pmap_pinit(); allocate the PTEs here, not in cpu_fork().
page {0,1} base and length registers in the pmap structure. They will
be loaded in to the PCB when the process's address space is activated
by way of pmap_activate().
- Remove pmap_pinit() macro; it's now a real function.
- Prototypes for pmap_pinit(), pmap_activate(), pmap_deactivate().
perry