define a flag UVM_PGA_USERESERVE to allow non-kernel object
allocations to use pages from the reserve.
use the new flag for allocations in pmap modules.
When we put a page on the collection list, we must subtract NPVPPG from the
total free count: one for each pv_entry that's free in that page, and one for
each free pv_entry in other pages that we're going to eat by moving the ones
in the page being collected.
* Map the message buffer with access_type = VM_PROT_READ|VM_PROT_WRITE `just
because'.
* Map the file system buffers with access_type = VM_PROT_READ|VM_PROT_WRITE to
avoid possible problems with pagemove().
* Do not use VM_PROT_EXEC with either of the above.
* Map pages for /dev/mem with access_type = prot. Also, DO NOT use
pmap_kenter() for this, as we DO NOT want to lose modification information.
* Map pages in dumpsys() with VM_PROT_READ.
* Map pages in m68k mappedcopyin()/mappedcopyout() and writeback() with
access_type = prot.
* For now, bus_dma*(), pmap_map(), vmapbuf(), and similar functions still use
access_type = 0. This should probably be revisited.
"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)
cache). This helps to avoid cache alias problems, and can improve performance
in the case where physical pages have multiple mappings (since the pages will
not have to be marked cache-inhibited).
minor of libc and the major of libutil). For little-endian architectures
merge the bnswap() assembly versions with nto* and hton* using symbols
aliasing. Use symbol renaming for the bswap function in this case to avoid
namespace pollution.
Declare bswap* in machine/bswap.h, not machine/endian.h. For little-endian
machines, common code for inline macros go in machine/byte_swap.h
Sync libkern with libc.
Adjust #include in kernel sources for machine/bswap.h.
mappings for CADDR1 and CADDR2, unless we're built w/ -DDEBUG. Since
these addresses are only used in these routines, we can "lazily invalidate"
them by just using them again. This makes these routines a teeny bit faster,
as it saves 1 or 2 TBIS's per call.
Suggested by Leo Weppelman <leo@netbsd.org>.
pmap, forget all of the mappings for the user address space for that pmap.
This causes the PT pages to be freed so that they can be reclaimed by the
VM system. [*]
[*] Actually, in the current implementation, it merely causes the wiring
count on the PT pages to drop to 0, which allows them to be reclaimed by
the pagedaemon. Handling of PT pages needs to be completely rewritten.
pmap_remove() for the temporary addresses. This is completely unnecessary
as the temps are used ONLY for these routines, and we have better control
over the mapping by manipulating the PTE ourself. On VAC systems, cache-
inhibit the mapping to prevent wasting a cache load.
These routines are now significantly faster.
Add a DIAGNOSTIC check in pmap_enter() for kernel pmap and (CADDR1 or CADDR2);
nothing should be adding mappings there via that interface.
- returned EOPNOTSUPP rather than -1.
- no check for negative offset.
many of these fix potential security problems in these drivers.
XXX XXX XXX
the d_mmap cdev routine should be changed to have a prototype like:
paddr_t (*d_mmap) __P((dev_t, off_t, int));
by someone!
- cpu_set_kpc() now takes void *arg third argument, passed to the
entry point.
- cpu_fork() allows parent to be non-curproc iff parent is proc0.
When forking non-curproc, assume its state has already been saved.
- Adjust various pieces of machine-dependent code to account of all of this.
-sys/lib/libkern builds as library per default (as it was documented all
the time)
-ports able to LKM set "KERN_AS=obj" explicitely in their Makefiles
(for now; should depend on actual "option LKM" or -better- functions
included for LKM use should be pulled in by a stub)
-always link libcompat before libkern - libkern stuff can be referred to
by libcompat, but not the other way
which require special handling, e.g. sigreturn on m68k.
This differs from the old sigreturn trap in that we require the syscall
number to be in register d0, just like the regular syscall entry point.
This will allow sigreturn to be versioned in the future without the need
to allocate another trap vector.
u-area in machine-dependent code. Instead, call exit2() to schedule
the reaper to free them for us, once it is safe to do so (i.e. we are
no longer running on the dead proc's vmspace and stack).
interrupts; if there's an interrupt pending (i.e. because the user pressed
a key or moved his mice while the kernel was being loaded), the interrupt
handler may safely be run. Fixes PR port-hp300/5397.
reading the DIO device ID at select code 7, but rather hard-wire the ID
to the IHPIB ID. This prevents us reading what might look like a valid
ID to another device when IHPIB is present. (IHPIB doesn't always return
a correct device ID, grumble.)
as with user-land programs, include files are installed by each directory
in the tree that has includes to install. (This allows more flexibility
as to what gets installed, makes 'partial installs' easier, and gives us
more options as to which machines' includes get installed at any given
time.) The old SYS_INCLUDES={symlinks,copies} behaviours are _both_
still supported, though at least one bug in the 'symlinks' case is
fixed by this change. Include files can't be build before installation,
so directories that have includes as targets (e.g. dev/pci) have to move
those targets into a different Makefile.
a HAVE_GCC28 check-variable that can now be used to add other gcc-2.8
flags in cases where they may be useful, or to remove gcc 2.7.2 "bug
workaround" flags.)
we were in ledcontrol(), the heartbeat twinkler would just punt on
updating the LED even though it had already updated the status. (This
was broken in v1.73 of locore.s).
Rather than resurrect the old code, simplify ledcontrol() and don't
bother with mutual exclusion. As mentioned by the comments describing
this function, we really don't need to be that precise. We do, however,
want to guarantee instructions that modify the status variable directly,
so the function is now primarily inline assembly.
as this breaks C++ code that happens to indirectly include this header.
Both Matthias Scheler and I noticed this, independently.
This problem notably does not affect the atari and sun3/sun3x ports,
which have already implemented a similar solution.
was converted to use Mach VM for Net2/4.4BSD. The user segment table
pointer was originally stored in the PCB. When Mach VM came along,
however, it was also stored in the pmap, and loaded into the PCB in
pmap_activate(). pmap_activate() would then note that the PCB's USTP
was now in sync with the pmap's USTP, and the low-level context switch
code would use the value from the PCB.
However, pmap_activate() would also load the hardware MMU context if
the pmap was the current pmap (or, in the case where pmaps can be shared,
such as in NetBSD, if the proc was the current proc). The low-level
context switch code would then reload the hardware _again_ using the
USTP from the PCB.
However, the optimization of not calling pmap_activate() if "stchanged"
was false ended up causing some processes to use stale USTP values from
the PCB when the low-level context switch code reloaded the hardware!
This was noticed by using a real vfork(2) (which worked for some time
before failing, surprisingly!)
Since I'm hard pressed to find any real optimization here (since the
hardware was always reloaded once, sometimes twice!), the code now always
calls pmap_activate(), which uses the correct USTP value (the one in the
pmap). The PCB's USTP is now ignored, and should eventually be g/c'd.
Another optimization can actually be performed, and I have added a comment
describing what it is, but have not yet implemented it.
Also note that most of the loadustp() functions where actually incomplete.
This has been corrected. These functions should probably be split up into
MMU-specific operations, and called indirectly, rather than doing constant
run-time decision making based on values that will never change during the
course of a boot's lifetime.
pseudo-device rnd # /dev/random and in-kernel generator
in config files.
o Add declaration to all architectures.
o Clean up copyright message in rnd.c, rnd.h, and rndpool.c to include
that this code is derived in part from Ted Tyso's linux code.
msgbuf. Note that old 'dmesg' and 'syslogd' binaries will continue running,
though old 'dmesg' binaries will output a few bytes of junk at the start of
the buffer, and will miss a few bytes at the end of the buffer.
port, which is lifted from amiga port, plus some changes from me:
- Add support for the HP MMU to the 020/030 bus/address error handler
(mostly lifted wholesale from the old code).
- Rename addrerr and buserr to busaddrerr2030. The new name reflects that
these functions are specific to the 68020 and 68030, and that the same
handler function is used for both vectors.
The vector table is patched once we know our CPU type, before the MMU
is enabled. In the event that we're running on a CPU that we're not
configured for, simply invoke the PROM's "reboot request"; we have no
hope of running in the event of a config botch, since we need working
a working bus error handler for console initialization.
These new functions optimze for common-case page faults, eliminate
many run-time checks, and are sharable.
