magic number and a pointer to the bootinfo data.
XXX: A bootinfo_magic record is not checked for at the moment, even
though test bootblocks initialise the bootinfo data with one.
o Use the bootinfo symtab information in preference to searching for a
valid a.out exec header after _end for initialising DDB.
XXX: Should retire a.out exec header support altogether. Loosing the
ability to load symbols from old bootblocks isn't much of a loss.
After 1.4?
o Add "booted kernel" machdep sysctl.
pointer to just underneath _start. Allows bootblocks (or other kernel
calling programs) to pass more than 4 arguments if it sets up the stack
properly.
The 4kB figure may be overkill - on the pmax it only needs to be a dozen
of so bytes.
in not just used to access memory but is bassed to bus_space_xxx_n()
methods. For debugging purposes, bus_space can have additional constraints
which will be properly met by BUS_SPACE_ALIGNED_POINTER().
"BUS_SPACE_ALIGNED_POINTER()".
Equal to the param.h "ALIGNED_POINTER()" normally, but obeys additional
requirements of the bus_space_xxx_n() macros. (BUS_SPACE_DEBUG)
PTEs is ignored when in kernel mode. Hack around this just like we do on the
i386, by adding a prepass to copyout() to check for write permission on the
destination pages.
* Don't bother pulling PT_M and PT_H bits from pv_flags; they can't ever be
set there!
* Actually make pmap_clear_reference() do something useful.
* Also set the referenced bit (PT_H) when emulating a write fault.
If we're doing modified bit emulation, we must revoke write permission in
pmap_clear_modify(). This is non-negotiable. I will revoke write permission
in pmap_clear_modify(), or suffer the wrath of a thousand bricks.
same uid or by root.
This code is from FreeBSD. (Whilst it was originally obtained from OpenBSD,
FreeBSD fixed it to work with multicast. To quote the commit message:
- Don't bother checking for conflicting sockets if we're binding to a
multicast address.
- Don't return an error if we're binding to INADDR_ANY, the conflicting
socket is bound to INADDR_ANY, and the conflicting socket has
SO_REUSEPORT set.
)
simonb