pool: avoid triggering assert(b->magic != FREE_MAGIC) in blocksetsize() for mallocalignl()
when we trim the front of a block with freefromfront(),
the block magic of the back was not initialized which
could sometimes trigger the assert in blocksetsize()
to fail. fix is to just move the initialization of the
magic field before the blocksetsize() call.
the second b->magic = UNALLOC_MAGIC isnt really required
but just done for consistency with the trim() code above.
nusb/kb: always try to recover on error, fix recover for multi-function devices
when we get an i/o error, always call hdrecover() which
will reset the port and reinitialize the interface of
the calling processes endpoint.
handle the case when we have multi-function device with
multiple reader procs in hdrecover(). the sequence is
as follows:
1) any of the reader procs encounters i/o error and calls hdrecover(),
acquires qlock and initiates port reset.
2) any other readerprocs will now encounter i/o error (due to reset) and also call
hdrecover() but will be waiting on the qlock for reset to complete.
3) first process completes reset and reinitializes its interface with setproto()
and then releases the qlock for the other readers todo the same.
pc, pc64: extend initial memory map for qemu multiboot data
qemu puts multiboot data after the end of the kernel image, so
to be able to KADDR() that memory early, we extend the initial
identity mapping by 16K. right now we just got lucky with
the pc kernel as it rounds the map to 4MB pages.
sgi: disable graphical arcs console printing on screen modeset
when we switch to graphics mode, we do not want graphical arcs console
to print on the screen anymore as it assumes 8bit color mode and just
messes up the screen on kernel prints.
cinap_lenrek [Tue, 31 Mar 2015 23:30:16 +0000 (01:30 +0200)]
vl: prevent stack altering instructions to be hoisted above loads
fixes bug with libmemdraw where the linker would hoist
the final ADD $const, SP at the end over loads from the
stack causing the front to fall off once a interrupt hits.
cinap_lenrek [Sun, 29 Mar 2015 22:26:33 +0000 (00:26 +0200)]
sgi: preserve R27 in setregisters(), use setregisters() in noted()
GEVector() saves the exception return PC in Ureg.r27 which needs
to be preserved.
there should be no reason for the user to change the status
register from noted() eigther, so we now just use setregisters()
in noted() to restore previous general purpose registers. this
means that CU1 will always be off after noted() because notify()
has disabled the FPU on entry and set fpstatus to FPinactive
if it was on. once user starts using FPU again, it will trap and
restore fpu registers.
cinap_lenrek [Sat, 28 Mar 2015 13:11:17 +0000 (14:11 +0100)]
sgi: new approach for etherseeq
touching transmit descriptors while dma is running causes the
front to fall off. new approach keeps a counter of free
descriptors in the Ring structure that is incremented
by txintr() when transmit completed.
txintr() will clean descriptors once dma has stopped and
restart dma when there are more descrtors in the chain.
cinap_lenrek [Sat, 28 Mar 2015 04:15:40 +0000 (05:15 +0100)]
sgi: work in progress kernel for sgi mips machines (only tested with r5k indy)
this provides basic console support using the ARC bios routines
theu uartarcs driver. and has native seeq ethernet driver which
was written by reading the 2ed devseq driver as i have no
documentation on the hardware. mmu and trap code is based on the
routerboard kernel.
cinap_lenrek [Thu, 19 Mar 2015 10:44:26 +0000 (11:44 +0100)]
db: fix unicode support (thanks giacomo)
from the unicode-db patch readme:
command() receives a char* that is assigned to lp, which is a Rune*,
and lp is incremented later in readchar(), so each read consumed 4 bytes.
The only time command() is called is in runpcs() with bkpt->comm,
which is a char* built in subpcs through a char*, so the string stored in
bkpt->comm was not a Rune string. A way to test the bug is:
cinap_lenrek [Mon, 16 Mar 2015 04:46:08 +0000 (05:46 +0100)]
kernel: get rid of auxpage() and preserve cache index bits in Page.va in mount cache
the mount cache uses Page.va to store cached range offset and
limit, but mips kernel uses cache index bits from Page.va to
maintain page coloring. Page.va was not initialized by auxpage().
this change removes auxpage() which was primarily used only
by the mount cache and use newpage() with cache file offset
page as va so we will get a page of the right color.
mount cache keeps the index bits intact by only using the top
and buttom PGSHIFT bits of Page.va for the range offset/limit.
cinap_lenrek [Mon, 16 Mar 2015 04:23:38 +0000 (05:23 +0100)]
kernel: avoid repeated calls to reclaim(), dont miss last page in Pte
when we are skipping a process because we could not acquire
its segment lock, dont call reclaim() again (which is pointless
as we didnt pageout any pages), instead try the next process.
the Pte.last pointer is inclusive, so don't miss the last page
in pageout().
cinap_lenrek [Sun, 15 Mar 2015 14:27:56 +0000 (15:27 +0100)]
boot: disable group/other permission checking in bootfs paqfs
when building bootfs in d770 mode directory, the other permissions
in bootfs paq are masked off which results in boot to fail. theres
no point in checking group/other permissions on boot, so just disable
permissin checking in paqfs with the -a flag.
cinap_lenrek [Wed, 11 Mar 2015 17:09:48 +0000 (18:09 +0100)]
ndb/dns: reduce sencodefmt() to not link in enc32()/enc64() encoders
the special sencodefmt() in ndb/dn.c is only used with %H format for
hexadecimal printing for binary strings. removing the unused
calls to enc32() and enc64() reduces the code size by arround 4K.
(this is usefull for ndb/getip which gets linked into the kernel).
cinap_lenrek [Wed, 11 Mar 2015 16:14:56 +0000 (17:14 +0100)]
smtp, smtpd: fix use of enc64(), fix memory leaks in doauth()
the approximation of n*2 to calculate the number of output bytes
for enc64() fails for inputs of size < 3. this is fixed by using
encodefmt() which gets the calculation right and also simplifies
the code avoiding the allocation and freeing of intermediate string
buffers.
cinap_lenrek [Tue, 10 Mar 2015 17:16:08 +0000 (18:16 +0100)]
kernel: fix integer overflow in syssegflush(), segment code cleanup
mcountseg(), mfreeseg():
use Pte.first/last pointers when possible and avoid constructs
like s->map[i]->pages[j].
freepte():
do not zero entries in freepte(), the segment is going away and
here is no point in zeroing page pointers. hoist common code at
the top avoiding duplication.
segpage(), fixfault():
avoid load after store for Pte** pointer.
fixfault():
return -1 in default case to avoid the "used but not set" warning
for mmuphys and get rid of the useless initialization.
syssegflush():
due to len being unsigned, the pe = PGROUND(pe) can make "chunk"
bigger than len causing a overflow. rewrite the function and deal
with page alignment and errors at the beginning.
cinap_lenrek [Sat, 7 Mar 2015 17:59:06 +0000 (18:59 +0100)]
kernel: catch address overflow in syssegfree()
the "to" address can overflow in syssegfree() causing wrong
number of pages to be passed to mfreeseg(). with the current
implementation of mfreeseg() however, this doesnt cause any
data corruption but was just freeing an unexpected number of
pages.
this change checks for this condition in syssegfree() and
errors out instead. also mfreeseg() was changed to take
ulong argument for number of pages instead of int to keep
it consistent with other routines that work with page counts.
cinap_lenrek [Fri, 6 Mar 2015 15:16:45 +0000 (16:16 +0100)]
devsd: always page align sd buffers
sdbio() tests if it can pass the buffer pointer directly to
the driver when it is already in kernel memory. we also need
to check if the buffer is properly aligned but alignment
requirement is handled in system specific sdmalloc() and
was not known to devsd.
to solve this, we *always* page align sd buffers and get rid
of the system specific sdmalloc() macro (was only used in bcm
kernel).