Commit Graph

12 Commits

Author SHA1 Message Date
will
2f2052508e Garbage collect dragonfly and legacy FreeBSD system support from dcons(4).
Submitted by:	gibbs
MFC after:	1 week
Sponsored by:	Spectra Logic
MFSpectraBSD:	1110990 on 2015/01/06
2015-01-21 19:53:52 +00:00
marius
325428c528 Check the return values of contigmalloc(9) as well as bus_dma(9)
functions and stop attaching of dcons(4) and dcons_crom(4) if
they indicate failure. This fixes a panic seen on sparc64 machines
with no free physical memory in the requested 32-bit region but
still doesn't make dcons(4)/dcons_crom(4) these work. I think
the latter can be fixed by simply specifying ~0UL as the upper
limit for contigmalloc(9) and letting the bounce pages and the
IOMMU respectively handle limitations of the DMA engine. I didn't
want to change that without the consensus of simokawa@ though,
who unfortunately didn't reply so far.

MFC after:	1 week
2009-01-07 21:25:44 +00:00
marius
fd213ef8e2 Given that the buffer dcons_crom(4) exposes is used for both input
and output, set BUS_DMA_COHERENT when creating the DMA map used for
loading the buffer. As a side-effect this solves locking issues on
sparc64 when dcons(4) calls bus_dmamap_sync(9) while in an interrupt
filter, which are executed in a critical section, and iommu(4) has
to use a sleep lock when taking advantage of the streaming buffer.

Reported and tested by:	kensmith
Approved by:		simokawa
2008-11-19 22:09:03 +00:00
simokawa
5f5cd9e4f2 Add the address of IDT in the configuration ROM. (i386/amd64 only)
A change to dconschat(8) will follow so that it can bomb
this address over FireWire to reset a wedged system.

Though this method is just a hack and far from perfection,
it should be useful if you don't want to go machine room
just to reset or to power-cycle a machine without
remote-managed power supply.  And much better than doing:
# fwcontrol -m target-eui64
# dd if=/dev/zero of=/dev/fwmem0.2 bs=1m
2007-06-08 04:33:25 +00:00
simokawa
ed91131846 Poll bus resets on FireWire while kdb/gdb is active.
Now, it's safe to call the fwohci interrupt(polling) routine while ddb/gdb
is active. After this change, a dcons connnection over FireWire can survive
bus resets even in kernel debugger.

This means that it is not too late to plug a FireWire cable after a panic
to investigate the problem.

Actually there is a small window(between a jump to kernel from loader and
initialization of dcons_crom) in which no one can take care of a bus reset.
Except that window, firewire console should keep working
from loader to reboot even with a panic and a bus reset.
(as far as you enable LOADER_FIREWIRE_SUPPORT)
2007-06-08 00:54:44 +00:00
simokawa
135548ec9b Change default value of hw.firewire.dcons_crom.force_console to 0
for least astonishment.

MFC after: 3 days
2007-05-27 14:00:34 +00:00
imp
4b319958e7 Start each of the license/copyright comments with /*-, minor shuffle of lines 2005-01-06 01:43:34 +00:00
simokawa
bc246db21d - Split dcons core code and OS dependent code.
- Implement dcons_ischar() and dcons_load_buffer().
- If loader passed a dcons buffer address, keep using it.
	(We still need a patch to cheat memory management system.)
2004-10-13 05:38:42 +00:00
phk
9d102d7d5a Add missing <sys/module.h> includes 2004-05-30 20:08:47 +00:00
simokawa
24775302eb - Clean up global data.
- Force dcons to be the high-level console after dcons_crom
	has been attached.
- Add a tunable to be the high-level console.
2004-02-16 07:25:46 +00:00
simokawa
3357535415 Move post dmamap_load processes into the callback function. 2003-11-08 16:26:22 +00:00
simokawa
c96f6e4f1d Add dumb console driver and related bits.
dcons(4): very simple console and gdb port driver
dcons_crom(4): FireWire attachment
dconschat(8): User interface to dcons

Tested with: i386, i386-PAE, and sparc64.
2003-10-24 15:44:10 +00:00