respect to other threads and signal handlers by moving to
the _thread_critical_enter/exit functions.
o Introduce an static function, testcancel(), that is used by
the other functions in this module. This allows it to make
locking assumptions that the top-level functions can't.
o Rework the code flow a bit to reduce indentation levels.
Approved by: markm/mentor, re/blanket libthr
Reviewed by: jeff
all of the Optio series have the same problems. It might be a better
approach eventually to add wildcard support to USB quirks.
PR: kern/50271, kern/46369
Approved by: re (rwatson)
- Fix compilation without GEM_DEBUG.
- Do not #define GEM_DEBUG by default; it adds overhead (due to bzero()ing
RX space) and is not needed any more, since the driver is quite stable
now.
- Fix watchdog timeouts when failing to load TX packets.
- Do not forcibly limit the number of descriptors used for a packet to
GEM_NTXSEGS, by passing this number to bus_dma_tag_create(). There is
no requirement for a limit any lower than the total number of
available descriptors, and the present limit caused network problems
due to mbuf chains requiring more descriptors.
GEM_NTXSEGS is still used to estimate the interrupt window size, for
which we just need an estimate.
Approved by: re (rwatson)
The submitter of PR 32118 told me that this patch also fixes autoselecting
for znyx 4 port cards (10baseT, 100baseTX did work already).
PR: 32118
Reviewed by: imp
Approved by: rwatson (re)
Build LINT on -STABLE now that tinderbox.pl knows how. Also try to build
LINT on powerpc and amd64 (this is a formality as they don't have NOTES
so nothing will be built)
Add two setups for release testing, with plenty of NO* to speed things up.
If the config key was not specified on the command line, try to guess it
from the hostname.
NOCDROM, NODOC and NOPORTS to save time and space, but I may remove
those at a later date so we can use the results to populate a snapshot
server.
Document the --machine option.
Make $arch and $machine default to the correct values for the current
system. This shouldn't make any difference unless you run the
tinderbox on a pc98 machine, since for all other platforms, $arch and
$machine are the same.
Only set kernel-related variables if actually building a kernel or a
release.
Be paranoid and cd to the correct directory in each stage so we're
sure we invoke make(1) in the right place.
To support building LINT on -STABLE, don't try to 'make LINT' unless
NOTES exists, but build LINT if the config file exists even if there
is no NOTES.
The advantage of using register sets is that you don't focus on each
register seperately, but instead instroduce a level of abstraction.
This reduces the chance of errors, and also simplifies the code.
The register sers form the basis of everything register.
The sets in this file are:
struct _special
contains all of the control related registers, such as instruction
pointer and stack pointer. It also contains interrupt specific registers
like the faulting address. The set is roughly split in 3 groups. The
first contains the registers that define a context or thread. This is
the only group that the kernel needs to switch threads. The second group
contains registers needed in addition to the first group needed to switch
userland threads. This group contains the thread pointer and the FP control
register. The third group contains those registers we need for execption
handling and are used on top of the first two groups.
struct _callee_saved, struct _callee_saved_fp
These sets contain the preserved registers, including the NaT after
spilling. The general registers (including branch registers) are
seperated from the FP registers for ptrace(2).
struct _caller_saved, struct _caller_saved_fp
These sets contain the scratch registers based on SDM 2.1, This means that
both ar.csd and ar.ccd are included here, even though they contain ia32
segment register descriptions. We keep seperate NaT bits for scratch and
preserved registers, because they are never saved/restored at the same
time.
struct _high_fp
The upper 96 FP registers that can be enabled/disabled seperately on
the CPU from the lower 32 FP registers. Due to the size of this set,
we treat them specially, even though they are defined as scratch
registers.
CVS ----------------------------------------------------------------------
save and restore "sets" of registers in various places.
The restorectx and swapctx functions are used by cpu_switch()
and deal with the special registers, as well as the preserved
registers.
The *callee_saved* functions are used to save and restore the
preserved registers (integer and floating-point). They are
useful for signal delivery and ptrace support.
The save_high_fp and restore_high_fp functions are used to
"load" and "unload" to and from the CPU as part of lazy context
switching.
The ia32 specific context functions have been kept with the ia32
code.
Approved by: re@ (blanket)
on the epc instruction. The epc instruction, given the permissions
of the page in which the epc is located, allows the privilege level
to be increased with little or no overhead. The previous privilege
level is recorded in the current frame marker and is restored by
a regular (function) return.
Since the epc instruction has to live in a page with non-standard
properties, we hardwire a "gateway" page in the address space. The
address of the gateway page is exported to userland in ar.k7. This
allows us to rewire the page without breaking the ABI.
The syscall stubs in libc are regular function calls that slightly
differ from the normal runtime. The difference is mostly to simplify
the stubs themselves by by moving some of the logic to the kernel.
The libc stubs call into the gateway page (offset 0), from where the
kernel trampolines to the code that sets up a minimal trapframe and
arranges to execute from the kernel stack.
The way back is basicly the same. The kernel returns to the gateway
page, whereby privilege is dropped, and jumps back to the syscall
stub.
Only the special registers are saved in the trapframe. None of the
scratch registers are preserved and since the kernel follows the
same runtime model, none of the preserved registers are saved.
Future enhancements can include the implementation of lightweight
syscalls, where kernel functions are performed without setting up
a trapframe. Good candidates are the *context syscalls for example.
Now that there's a gateway page from which code can be executed in
a non-privileged context, we also have the ideal place to put the
signal trampolines. By moving the signal trampolines from the user
stack to the gateway page, we open up the doors to unexecutable
stacks. The gateway page contains signal trampolines for both the
"legacy" break-based syscall code and the new and improved epc-
based syscall code.
Approved: re@ (blanket)
available by Hewlett-Packard under the MIT license. The unwinder is
small, clean and fast and needed little adaptation for use in the
kernel.
This import has embedded in it the changes needed to make it build
in a kernel environment.
To optimize the common case, the kernel will minimize the number
of registers saved by not saving the preserved registers. In case
access to preserved registers is needed (signal handling, ptrace)
the kernel will unwind to the context of the syscall or exception.
For this we need an unwinder.
Approved by: re (blanket)
server, map it to EAGAIN locally rather than EACCES. The NLM spec
indicates the DENIED corresponds to lock contention, not a permission
failure. This fixes O_EXLOCK/O_SHLOCK with O_NONBLOCK, which would
previously give a permission error, which in turn fixes things
like mailq(8) and lockf(1) over NFS.
Approved by: scottl (re)
Reviewed by: truckman, Andrew P Lentvorski, Jr. <bsder@allcaps.org>
Idea from: truckman
one or more actions in the list. This makes constructs like:
attach 10 {
// echo "Driver $device_name attached"
};
to be accepted by the parser. It will be treated as if the user had
entered:
// attach 10 {
// echo "Driver $device_name attached"
// };
(eg totally ignored).
Approved by: re@ (rwatson)
load_gs() calls into a single place that is less likely to go wrong.
Eliminate the per-process context switching of MSR_GSBASE, because it
should be constant for a single cpu. Instead, save/restore it during
the loading of the new %gs selector for the new process.
Approved by: re (amd64/* blanket)
has requested the lock in a non-blocking form, instead returning an
immediate failure. This appears to help reduce one of my "locks get
lost" symptoms involving lockf(1), which attempts a non-blocking lock
attempt before actually blocking on the lock. At this point the client
still gets back EACCES, which is an issue we're still working.
Approved by: re (scottl)
Submitted by: Andrew P. Lentvorski, Jr. <bsder@allcaps.org>
has already been registered with ATAPI/CAM (else there is nothing
to do). atapi_cam_reinit_bus may be called before the bus is
registered if an ATAPI command times out during the boot sequence.
PR: i386/51421
Reviewed by: roberto
Approved by: re (rwatson)
MFC after: 1 week
from the NFS server, following contention on a lock by this or another
client, immediately notify the waiting process that the lock has been
granted via a wakeup. Without this change, the client rpc.lockd will
not wakeup the waiting process until it next re-polls the lock (sometime
in the next ten seconds), which can lead to marked latency across all
potential lockers, as the lock is held by the client for the duration.
Approved by: re (scottl)
Submitted by: truckman
Reviewed by: Andrew P. Lentvorski, Jr <bsder@allcaps.org>
stolen from the ia64/ia32 code (indeed there was a repocopy), but I've
redone the MD parts and added and fixed a few essential syscalls. It
is sufficient to run i386 binaries like /bin/ls, /usr/bin/id (dynamic)
and p4. The ia64 code has not implemented signal delivery, so I had
to do that.
Before you say it, yes, this does need to go in a common place. But
we're in a freeze at the moment and I didn't want to risk breaking ia64.
I will sort this out after the freeze so that the common code is in a
common place.
On the AMD64 side, this required adding segment selector context switch
support and some other support infrastructure. The %fs/%gs etc code
is hairy because loading %gs will clobber the kernel's current MSR_GSBASE
setting. The segment selectors are not used by the kernel, so they're only
changed at context switch time or when changing modes. This still needs
to be optimized.
Approved by: re (amd64/* blanket)
- Move struct sigacts out of the u-area and malloc() it using the
M_SUBPROC malloc bucket.
- Add a small sigacts_*() API for managing sigacts structures: sigacts_alloc(),
sigacts_free(), sigacts_copy(), sigacts_share(), and sigacts_shared().
- Remove the p_sigignore, p_sigacts, and p_sigcatch macros.
- Add a mutex to struct sigacts that protects all the members of the struct.
- Add sigacts locking.
- Remove Giant from nosys(), kill(), killpg(), and kern_sigaction() now
that sigacts is locked.
- Several in-kernel functions such as psignal(), tdsignal(), trapsignal(),
and thread_stopped() are now MP safe.
Reviewed by: arch@
Approved by: re (rwatson)
don't add the current time to it, but leave it as clear so that when the
timer is disabled, the it_value is always clear.
Reviewed by: bde
Approved by: re (rwatson)
