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.
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.
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.
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.
bootmkfile will now looks for the following proto files in order
and pick the first one it finds to build the bootfs.paq file:
1) $CONF.boofs.proto (config specific)
2) bootfs.proto (kernel specific)
3) $BOOTDIR/bootfs.proto (default generic)
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:
db program
main:b argv/X
:r
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.
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().
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.
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).
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.
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.
syssegflush(), segpage(), fixfault(), putseg(), relocateseg(),
mcountseg(), mfreeseg():
keep naming consistent.
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.
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).
chaninit() does not initialize Chan.qentry and Chan.nentry
and there is no way to get rid of such a channel. nobody is
using it, so removing the function to avoid confusion.
ignore physical segments in mcountseg() and mfreeseg(). physical
segments are not backed by user pages, and doing putpage() on
physical segment pages in mfreeseg() is an error.
do now allow physical segemnts to be resized. the segment size
is only checked in segattach() to be within the physical segment!
ignore physical segments in portcountpagerefs() as pagenumber()
does not work on the malloced page structures of a physical segment.
get rid of Physseg.pgalloc() and Physseg.pgfree() indirection as
this was never used and if theres a need to do more efficient
allocation, it should be done in a portable way.
it is possible to have fonts belong to different or no display, so the
check for defaultsubfont has to be against font->display, not the global
display variable.
remove unused freeup() routine.
handle strdup() error in allocsubfont() and realloc() error in buildfont().
the namespace might be shared by other processes. instead, we
create a anonymous pipe with pipe() and use devdup to open one
end close-on-exec. this is shorter and avoids the race condition.
do not touch Execargs after writing the error message as the
process might be gone after the write. this was to manually
close the fd which isnt neccesary as the kernel will do it
for us on the following exit.
rebuilding the xref table does not work for pdfs with
compressed object streams. as a work arround, we skip
xref table verification and ignore wrong xref gen #
for gen 0 objects.
convert:
x = B || W
MOVxLZX a, r; MOVxQZX r, b -> MOVxQZX a, r; MOVQ r, b
MOVxLSX a, r; MOVxQSX r, r -> MOVxQSX a, r; MOVQ r, r
the MOVQ can then be eleminated by copy propagation.
improve subprop() by accepting other mov and lea
instructions as the source op.
tlsServer() closes the passed in fd, in our case fd=1 leaving it
with no std output which got occupied by pipe() filedescriptor
which it then closed after duping... a classic.
delete all this mess. theres no reason to fork() and copy traffic
on a pipe at all as tlsServer() gives us a perfectly valid filedescriptor.
just dup() and exec() and we'r done.
the imported wc from sources is arround 8 times slower
than our old one. it is common to run wc on large log files
to count lines. so i think the implementation complexity
is justified. (just like with grep)
the following hooks have been added to the ehci Ctlr
structore to handle cache coherency (on arm):
void* (*tdalloc)(ulong,int,ulong);
void* (*dmaalloc)(ulong);
void (*dmafree)(void*);
void (*dmaflush)(int,void*,ulong);
tdalloc() is used to allocate descriptors and the periodic
frame schedule array. on arm, this needs to return uncached
memory. tdalloc()ed memory is never freed.
dmaalloc()/dmafree() is used for io buffers. this can return
cached memory when when hardware maintains cache coherency (pc)
or dmaflush() is provided to flush/invalidate the cache (zynq),
otherwise needs to return uncached memory.
dmaflush() is used to flush/invalidate the cache. the first
argument tells us if we need to flush (non zero) or
invalidate (zero).
uncached.h is gone now. this change makes the handling explicit.
map the whole ocm memory on boot so we can translate physical to
virtual addresses and back for uncached memory using KADDR() and
PADDR().
replace ualloc() with ucalloc() returning virtual address. physical
address can be acquired with PADDR() now.
as ocm is now always mapped, use KADDR() instead of tmpmap() for
mp bootstrap.
passing "", "." or ".." as name caused a crash in
getenv() as it would open the directory; then seek()
to determine the file size would fail and return -1.
now checking for these special names and set
error string when its bad.
doing a single read() will not work when /env has a
9p fileserver mounted onto it and the file size is bigger
than the i/o unit. so doing incremental reads until
we get eof.
there are no kernels currently that do page coloring,
so the only use of cachectl[] is flushing the icache
(on arm and ppc).
on pc64, cachectl consumes 32 bytes in each page resulting
in over 200 megabytes of overhead for 32gb of ram with 4K
pages.
this change removes cachectl[] and adds txtflush ulong
that is set to ~0 by pio() to instruct putmmu() to flush
the icache.
vbs/vbe members in Mode was only used in the vesadb
and cannot be changed from vgadb.
use shs/ehs in drivers when refering to the horizontal
sync pulse. clarify the matter in a comment.
link detailed timing modes at the head of the edid
modelist. these are the modes we'r interested in,
not the ones from vesadb.
igfx and vesa can determine monitor timing information from ddc
and store the edid info for connected monitors in vga->edid[].
when monitor type cannot be found in vgadb, we consult the edid
information and make a mode based on the edid info.
this avoids having to maintain a vgadb entry for each monitor.
monitor can be set to "[width]x[height]@[freq]Hz" for a specific
edid setting. when not found, a mode is searched based on the
size.
so the following should work:
aux/vga -m 1366x768@60Hz -l 1366x768x32
aux/vga -m auto -l 1366x768x32
dbvesamode() modified the passed in size string in the process
of option parsing. this is a no-go because the string might be
constant in the read only section. provide cracksize() function
for the parsing and make a static copy.
do the vendor specific monitor detection in vbesnarf() instead
of vbecheck(). vbecheck()'s purpose is to check if vesa bios
service is avialable, not snarf graphics card state.
nvidiascale() was a no-op because it missed the vbecall() at
the end of the function. this means it was never tested so i
add the missing vbecall(), but disable nvidiascale for now
until someone tests this.
keep fancy stuff out of the Vbe structure. it is just there for
making bios calls, not keep state about the graphics card.
we used to read beyond the boundaries of the becon because of
the end pointer was offset by the beacon header. this is
also what caused the double entries.
