in a more elegant way, but it works as is, and we need it now.
- Add a README and Makefile for the above. Note that this directory should
NOT be added to ../Makefile's SUBDIRS.
somehow got lost between NetBSD and Linux. Output side mbuf-walking
code now correctly bytestuffs mbuf chains, as well as single mbufs
and clusters.
* Update radio error-parsing code to Stuart's latest stable code.
We now parse error messages the older code didn't.
* Note where radio-crash watchdogs should be added (the linux code
is there, #ifdef'ed out). This still just doesn't work.
The radio reset doesn't always work even when slattatch is first started,
but I have a radio with old firmware, which may be a contributing factor.
* Correct the checks for the tty output queue being overfull; estimate
the stuffed pkt size as (original * 65/64) + STRIP_HDRLEN + 2,
instead of SLIP's (2*SLMTU). Re-enable the disabled check now the
size estimate isn't excessively large.
* Fix BPF tapping of strip interfaces, STRIP packets are wrapped
in a SLIP bpf header. This implies no BPF support for arp or atalk,
even though Linux boxes are sending arp requests and gratuitous arps.
There may be no good fix short of adding explicit STRIP encapsulation
support to bpf/tcpdump.
* Still need a solid walkthrough, and rewrite to eliminate redundant
receive-side mbuf copying.
[1] if user tries to enter in a bogus PVC don't leave it in the routing
table ... remove it
[2] change ioctl arg to include rxso for lower layer
[3] add hooks (inside "NATM" ifdef) for native mode atm sockets so that
they don't clash with IP PVCs. [i am still debugging the native
mode atm socket protosw code]
[1] rxslot "cur" pointer wasn't updated if we copied all data and
didn't have any fill. this could cause a service id mismatch
panic under load.
[2] recv of aal0 forgot to include the cell header in the data length
calc [add cell header length to midwayreg.h]
[3] fix control info "chop" for raw mode and aal0
[4] handle rxsb better for native atm connections
(XXX: still working on this ... not complete and needs revision)
- ability to be either a BROADCAST or POINTTOPOINT interface.
- a humble beginning of link-layer addressing (differs from PR
by using a `struct sockaddr' instead of single byte).
- Use an extent map to manage the ISA memory "hole", much like
how i/o port space is manged with an extent map. Do the actual
accounting in bus_mem_{,un}map().
- When creating the ioport and iomem extent maps, pass the
EX_NOBLOB flag, which tells the extent map code to disallow
fragmenting of regions. This will make it easier to catch
simple i/o and memory mapping bugs (like the if_ed.c bug I just
fixed) in the future.
- In bus_mem_map(), a chunk of code was indented using spaces.
Make the indentation use tabs.
- In bus_io_unmap(), fix the format passed to printf().
physical memory is sized by a loop that writes data to the first
word in a page, (writes something else to settle the bus) and then reads
back the word it wrote. If the read succeeds, the amount of physical
memory is increased by one page.
This fails on a 5000/1xx with a memory subsystem filled with 8 low-density
(4Mbyte) SIMMs. The memory-decoding hardware aliases the 32Mbytes of
physical memory at physical addresses 0, and at 32M (and presumably
at 64 and 96Mbytes.) The contiguous aliasing causes the memory-sizing
loop to continue at 32 MBytes, testing the memory that's really
at address 0, overwriting and crashing the kernel.
Fixed (for 1.2) by reading the SIMM-decoder stride size from the
motherboard, and reducing the loop bound to 32Mbytes on a 5000/1xx
with low-density SIMMs. (Other models have a non-power-of-2 maximum
memory and so are not subject to _contigous_ aliasing of physical memory).
This takes care of two related problems:
- `umount -f' wouldn't work if someone's working directory is
the filesystem root.
- vfs_unmountall() would complain about a busy `/' on a
diskless setup.
The physical memory-sizer claims to preserve memory contents
(specifically the contents of msgbuf). The loop writes different
values into two adjacent locations and reads the contents of the
first, to ensure that whatever is read back from the first location is
from memory and isn't just the first write persisting on the bus.
The loop preserved the value of the first location, but not the second,
resulting in the second test value ('ZZZZ') over-writing a word in msgbuf.
- A fixed extent map (statically allocated descriptor storage) is
created in init386(), just before the call to consinit(). The
fixed descriptor storage has enough room for 8 region entires,
which is plenty for early initialization, but doesn't chew up
that much memory.
This extent map (ioport_ex) manages the i386 i/o port
space (0x0 - 0xffff).
- Just before the call to configure() in cpu_startup(), a
flag is set which notifies the bus_io functions that it is
safe to use malloc() to allocate descriptor storage, in the
event that more than 8 regions are needed.
- bus_io_map() attempts to allocate the specified region from
ioport_ex. If the allocation succeeds, the io handle is
filled in. If the allocation fails, it is implied that
something else is already using that io space, and an
error condition is returned.
- bus_io_unmap() frees a region previously allocated from
ioport_ex in bus_io_map(). If the free fails, a warning
is printed on the conole.
These changes implement "port accounting". This is required for
proper autoconfiguration on the i386 port, and makes dealing with,
among other things, PCMCIA io mappings _much_ easier.
Understands allocation aligment and boundary restrictions, "specific region"
allocations, and suballocations. Capable of statically or dynamically
allocating map overhead.
Many thanks to Matthias Drochner for running the code for me, and sending
me bug fixes, optimizations, and suggestions. Also, many thanks to
Chris Demetriou for his extremely helpful suggestions.
XXX No manual page yet. One is forthcoming, as soon as I can scare up
the time to write one. This has been sitting on my plate for quite a
while, and several projects are waiting for it. Time to move on.
