If we don't do this here there's a 1 instruction race where an interrupt
could come in and crash the user process due to having no stack.
2. Pass %fsr to the user trap handler in %l4. Since %fsr can only be loaded
from or stored to memory, we need to do some contortions and temporarily
save it to the alternate global stack.
3. Reload the pcb and pcpu registers for traps in kernel mode, for sanity.
Submitted by: tmm (1, 2)
New locks are:
- pgrpsess_lock which locks the whole pgrps and sessions,
- pg_mtx which protects the pgrp members, and
- s_mtx which protects the session members.
Please refer to sys/proc.h for the coverage of these locks.
Changes on the pgrp/session interface:
- pgfind() needs the pgrpsess_lock held.
- The caller of enterpgrp() is responsible to allocate a new pgrp and
session.
- Call enterthispgrp() in order to enter an existing pgrp.
- pgsignal() requires a pgrp lock held.
Reviewed by: jhb, alfred
Tested on: cvsup.jp.FreeBSD.org
(which is a quad-CPU machine running -current)
Use ACPI_SUCCESS/ACPI_FAILURE consistently.
The AcpiGetInto* interfaces are obsoleted by ACPI_ALLOCATE_BUFFER.
Convert to using a kthread rather than timeout() to avoid problems
with the interpreter sleeping.
Use ACPI_SUCCESS/ACPI_FAILURE consistently.
The AcpiGetInto* interfaces are obsoleted by ACPI_ALLOCATE_BUFFER.
Use _ADR as well as _BBN to get our bus number.
Use ACPI_SUCCESS/ACPI_FAILURE consistently.
The ACPI global lock acquire takes a timeout value. I'm not sure what
we should do about timeouts on it; a deadlock against this lock is
catastrophic.
Use ACPI_SUCCESS/ACPI_FAILURE consistently.
The AcpiGetInto* interfaces are obsoleted by ACPI_ALLOCATE_BUFFER.
Kill off the timeouts that used to read _BIF and _BST. These are
invoked when the battery is actually read. timeout() is dangerous
in combination with ACPI, as the interpreter can block.
This driver still needs more work.
Use ACPI_SUCCESS/ACPI_FAILURE consistently.
The AcpiGetInto* interfaces are obsoleted by ACPI_ALLOCATE_BUFFER.
Add AcpiBatteryIsPresent helper to determine whether a battery device
is inserted.
Add ACPI_ALL_DRIVERS to the list of debug layers, now that we own the
namespace for this.
Pr:
watchpoint support for debugging (under LOADER_DEBUG). Claim the
physical and virtual addresses used to map the kernel from the prom;
we map it ourselves behind the scenes though. Add a reboot command.
Submitted by: tmm
While in userland, keep the thread's ucred reference in a shadow
field so that the usual place to store it is NULL.
If DIAGNOSTIC is not set, the thread ucred is kept valid until the next
kernel entry, at which time it is checked against the process cred
and possibly corrected. Produces a BIG speedup in
kernels with INVARIANTS set. (A previous commit corrected it
for the non INVARIANTS case already)
Reviewed by: dillon@freebsd.org
Remove bowrite(), it is now unused.
This is the first step in getting entirely rid of BIO_ORDERED which is
a generally accepted evil thing.
Approved by: mckusick
so that this is safe even if VARIABLE is longer than kern.argmax.
There is another instance of CFILES which might need the same treatment,
and might be noticed when doing a "make links".
The same has to be done in RELENG_4 (on some different file).
Noticed-by: picobsd cross-compiling LINT
Suggested-by: Alfred (bright@mu.org), des@freebsd.org
MFC-after: 3 days
counter type, as threatened in rev.1.8 (the density doesn't need to
be recorded since it can be derived from other fields). This doesn't
affect binary compatibility, but new utilities won't be able to depend
on the contents of this field because libc/gmon/gmon.c was broken --
it wrote garbage to the spare fields.
Added a history counter type field to struct gmonparam. This breaks
binary compatibility a little, since kgmon wanted to read the whole
struct. Fixed kgmon to only depend on reading the critical earlier
parts of the struct. This should also fix 6+ year old breakage of
binary compatibility when the profrate field was added.
Only initialize the new field in struct gmon for now, so that the
compatibility code for this (in kgmon) gets tested. The compatibility
code has to guesstimate the value. The new field in struct gmonparam
is for the kernel to initialize so that kgmon doesn't have to guess.
- P_INMEM checks in all the functions. P_INMEM must be checked because
PHOLD() is broken. The old bits had bogus locking (using sched_lock)
to lock P_INMEM. After removing the P_INMEM checks, we were left with
just the bogus locking.
- large comments. They were too large, but better than nothing.
Remove obfuscations that were gained in transition in rev.1.76:
- PROC_REG_ACTION() is even more of an obfuscation than PROC_ACTION().
The change copies procfs_machdep.c rev.1.22 of i386/procfs_machdep.c
verbatim except for "fixing" the old-style function headers and adjusting
function names and comments. It doesn't remove the bogus locking.
Approved by: des
OUT status. We are, apparently, required to force the f/w to log back in
if we want to try and talk to that disk again. This means either issuing
a LOGIN LOCAL LOOP PORT mailbox command, or by issuing a LIP. I've elected
to issue a LIP because this has a better chance of waking up the disk which
clearly just crashed and burned.
These should not occur at all. If they do, they should be darned rare.
MFC after: 1 week
It doesn't actually do it yet though. This adds a flag to config so
that we can exclude certain vendor files from this even when the rest
of the kernel has it on. make -DNO_WERROR would also bypass all of it.
so that after the first time we can follow the pointer instead
of having to scan the list.
This was the intended behaviour from day one.
PR: 34639
MFC-after: 3 days
the next commit actually doing the:
return val; -> return (val);
changes. This commit was done in preparation for getting ``struct
modules'' locked down.
Reviewed by: bde
Approved by: dfr
call VOP_CLOSE() with vp unlocked; clean up the return path a little,
in as much as our namei/vnode operation return paths can be cleared
up. For a return case that was apparently never taken, this sure
is ugly.
Reviewed by: jeffr
count that would otherwise be on one of the free queues. This eliminates a
panic when broken programs unmap memory that still has pending IO from raw
devices.
Reviewed by: dillon, alc
- Allow the OOM killer to target processes currently locked in
memory. These very often are the ones doing the memory hogging.
- Drop the wakeup priority of processes currently sleeping while
waiting for their page fault to complete. In order for the OOM
killer to work well, the killed process and other system processes
waiting on memory must be allowed to wakeup first.
Reviewed by: dillon
MFC after: 1 week
- Leave 10 processes for root-only use, the previous
value of 1 was insufficient to run ps ax | more.
- Remove the printing of "proc: table full". When the table
really is full, this would flood the screen/logs, making
the problem tougher to deal with.
- Force any process trying to fork beyond its user's maximum
number of processes to sleep for .5 seconds before returning
failure. This turns 2000 rampaging fork monsters into 2000
harmlessly snoozing fork monsters.
Reviewed by: dillon, peter
MFC after: 1 week
If the credential on an incoming thread is correct, don't bother
reaquiring it. In the same vein, don't bother dropping the thread cred
when going to userland. We are guaranteed to need it when we come back,
(which we are guaranteed to do).
step and the others are reservations for coming code.
All will be stubbed in this kernel in the next commit.
This will allow people to easily make KSE binaries for userland testing
(the syscalls will be in libc) but they will still need a real KSE kernel
to test it. (libc looks in /sys to decide what it should add stubs for).
to notify other nodes about the address change. Otherwise, they
might try and keep using the old address until their arp table
entry times out and the address is refreshed.
Maybe this ought to be done for INET6 addresses as well but i have
no idea how to do it. It should be pretty straightforward though.
MFC-after: 10 days
deprecated in favor of the POSIX-defined lowercase variants.
o Change all occurrences of NTOHL() and associated marcros in the
source tree to use the lowercase function variants.
o Add missing license bits to sparc64's <machine/endian.h>.
Approved by: jake
o Clean up <machine/endian.h> files.
o Remove unused __uint16_swap_uint32() from i386's <machine/endian.h>.
o Remove prototypes for non-existent bswapXX() functions.
o Include <machine/endian.h> in <arpa/inet.h> to define the
POSIX-required ntohl() family of functions.
o Do similar things to expose the ntohl() family in libstand, <netinet/in.h>,
and <sys/param.h>.
o Prepend underscores to the ntohl() family to help deal with
complexities associated with having MD (asm and inline) versions, and
having to prevent exposure of these functions in other headers that
happen to make use of endian-specific defines.
o Create weak aliases to the canonical function name to help deal with
third-party software forgetting to include an appropriate header.
o Remove some now unneeded pollution from <sys/types.h>.
o Add missing <arpa/inet.h> includes in userland.
Tested on: alpha, i386
Reviewed by: bde, jake, tmm
to be able to use 48bit addressing mode, but says the 48bit
size of the disk is 0, which according to spec means it can
address zero sectors in 48bit mode, why then say it supports
48bit mode at all..
buffer length, determine if the pointer is to a valid string. Currently,
the only check is whether a '\0' appears in the buffer. This is useful
when pulling in a structure from userland that may contain one or more
strings, and validity testing must be performed on elements of the
structure. When copying normal string arguments, copyinstr() is
expected to be used.
VOP_CLOSE() on the vnode, so that VOP_OPEN() and VOP_CLOSE() calls
are symmetric in all failure cases. This prevents an 'open' reference
from being leaked in that unlikely failure scenario.
should require a shared lock, rather than an exclusive lock, which can
improve performance. No actual code change here, since a number of
VFS locking fixes are in the works.
The use of the zone allocator may or may not be overkill.
There is an XXX: over in ufs/ufs/ufs_vnops.c that jlemon may need
to revisit.
This shaves about 60 bytes of struct vnode which on my laptop means
600k less RAM used for vnodes.
ucontext_t. Forward declare struct __ucontext in <sys/signal.h> and
remove reliance on <sys/ucontext.h> being included.
While I'm here, also hide osigcontext types from userland; suggested
by bde.
Namespace pollution noticed by: Kevin Day <toasty@shell.dragondata.com>
