hangs (one at boot, one at shutdown) in recent machines. First, only try
to take ownership of the EHCI controller if the BIOS currently owns the
controller. On a HP DL160 G5, the machine hangs when we try to take
ownership. Second, don't bother trying to give up ownership of the
controller during shutdown. It's not strictly required and a Dell DCS S29
hangs on shutdown after the config write.
Both of these changes match the behavior of the Linux EHCI driver. I also
think both of these hangs are caused by bugs in the BIOS' SMM handler
causing it to get stuck in an infinite loop in SMM.
MFC after: 1 week
accept a mouse using the boot subclass. Instead, restore the original
hid_is_collection() test and fallback to testing the interface class,
subclass, and protocol if that fails.
MFC after: 1 week
PR: usb/118670
might be currently programmed into the registers.
Underlying firmware (U-Boot) would typically program MAC address into the
first unit only, and others are left uninitialized. It is now possible to
retrieve and program MAC address for all units properly, provided they were
passed on in the bootinfo metadata.
Reviewed by: imp, marcel
Approved by: cognet (mentor)
We're now more robust against cases of non-sorted and/or non-continuous
numbering of those entries.
Reviewed by: imp, marcel
Approved by: cognet (mentor)
This was introduced as a workaround long time ago for some Alpha firmware
(which is now gone), and actually prevented net_close() to ever be
called.
Certain firmwares (U-Boot) need local shutdown operations to be performed on a
network controller upon transaction end: such platform-specific hooks are
supposed to be called via netif_close() (from within net_close()).
This change effectively reverts the following CVS commit:
sys/boot/common/dev_net.c
revision 1.7
date: 2000/05/13 15:40:46; author: dfr; state: Exp; lines: +2 -1
Only probe network settings on the first open of the network device.
The alpha firmware takes a seriously long time to open the network device
the first time.
Also suppress excessive output while netbooting via loader, unless debugging.
While there, make sys/boot/uboot more style(9) compliant.
Reviewed by: imp
Approved by: cognet (mentor)
While the KSE project was quite successful in bringing threading to
FreeBSD, the M:N approach taken by the kse library was never developed
to its full potential. Backwards compatibility will be provided via
libmap.conf for dynamically linked binaries and static binaries will
be broken.
sched_sleep(). This removes extra thread_lock() acquisition and
allows the scheduler to decide what to do with the static boost.
- Change the priority arguments to cv_* to match sleepq/msleep/etc.
where 0 means no priority change. Catch -1 in cv_broadcastpri() and
convert it to 0 for now.
- Set a flag when sleeping in a way that is compatible with swapping
since direct priority comparisons are meaningless now.
- Add a sysctl to ule, kern.sched.static_boost, that defaults to on which
controls the boost behavior. Turning it off gives better performance
in some workloads but needs more investigation.
- While we're modifying sleepq, change signal and broadcast to both
return with the lock held as the lock was held on enter.
Reviewed by: jhb, peter
Before this patch callback returned result of the last finished call chain.
Now it returns last nonzero result from all call chain results in this request.
As soon as this improvement gives reliable error reporting, it is now possible
to remove dirty workaround in ng_socket, made to return ENOBUFS error statuses
of request-response operations. That workaround was responsible for returning
ENOBUFS errors to completely unrelated requests working at the same time
on socket.
set a default name. If the IRQ is added as a consequence of
configurating the IRQ without there ever being a handler
assigned to it, we will not have a name. This breaks the
fragile intrcnt/intrnames logic.
state change and reliable error recovery.
o Moved vr_softc structure and relevant macros to header file.
o Use PCIR_BAR macro to get BARs.
o Implemented suspend/resume methods.
o Implemented automatic Tx threshold configuration which will be
activated when it suffers from Tx underrun. Also Tx underrun
will try to restart only Tx path and resort to previous
full-reset(both Rx/Tx) operation if restarting Tx path have failed.
o Removed old bit-banging MII interface. Rhine provides simple and
efficient MII interface. While I'm here show PHY address and PHY
register number when its read/write operation was failed.
o Define VR_MII_TIMEOUT constant and use it in MII access routines.
o Always honor link up/down state reported by mii layers. The link
state information is used in vr_start() to determine whether we
got a valid link.
o Removed vr_setcfg() which is now handled in vr_link_task(), link
state taskqueue handler. When mii layer reports link state changes
the taskqueue handler reprograms MAC to reflect negotiated duplex
settings. Flow-control changes are not handled yet and it should
be revisited when mii layer knows the notion of flow-control.
o Added a new sysctl interface to get statistics of an instance of
the driver.(sysctl dev.vr.0.stats=1)
o Chip name was renamed to reflect the official name of the chips
described in VIA Rhine I/II/III datasheet.
REV_ID_3065_A -> REV_ID_VT6102_A
REV_ID_3065_B -> REV_ID_VT6102_B
REV_ID_3065_C -> REV_ID_VT6102_C
REV_ID_3106_J -> REV_ID_VT6105_A0
REV_ID_3106_S -> REV_ID_VT6105M_A0
The following chip revisions were added.
#define REV_ID_VT6105_B0 0x83
#define REV_ID_VT6105_LOM 0x8A
#define REV_ID_VT6107_A0 0x8C
#define REV_ID_VT6107_A1 0x8D
#define REV_ID_VT6105M_B1 0x94
o Always show chip revision number in device attach. This shall help
identifying revision specific issues.
o Check whether EEPROM reloading is complete by inspecting the state
of VR_EECSR_LOAD bit. This bit is self-cleared after the EEPROM
reloading. Previously vr(4) blindly spins for 200us which may/may
not enough to complete the EEPROM reload.
o Removed if_mtu setup. It's done in ether_ifattach().
o Use our own callout to drive watchdog timer.
o In vr_attach disable further interrupts after reset. For VT6102 or
newer hardwares, diable MII state change interrupt as well because
mii state handling is done by mii layer.
o Add more sane register initialization for VT6102 or newer chips.
- Have NIC report error instead of retrying forever.
- Let hardware detect MII coding error.
- Enable MODE10T mode.
- Enable memory-read-multiple for VT6107.
o PHY address for VT6105 or newer chips is located at fixed address 1.
For older chips the PHY address is stored in VR_PHYADDR register.
Armed with these information, there is no need to re-read
VR_PHYADDR register in miibus handler to get PHY address. This
saves one register access cycle for each MII access.
o Don't reprogram VR_PHYADDR register whenever access to a register
located at a PHY address is made. Rhine fmaily allows reprogramming
PHY address location via VR_PHYADDR register depending on
VR_MIISTAT_PHYOPT bit of VR_MIISTAT register. This used to lead
numerous phantom PHYs attached to miibus during phy probe phase and
driver used to limit allowable PHY address in mii register accessors
for certain chip revisions. This removes one more register access
cycle for each MII access.
o Correctly set VLAN header length.
o bus_dma(9) conversion.
- Limit DMA access to be in range of 32bit address space. Hardware
doesn't support DAC.
- Apply descriptor ring alignment requirements(16 bytes alignment)
- Apply Rx buffer address alignment requirements(4 bytes alignment)
- Apply Tx buffer address alignment requirements(4 bytes alignment)
for Rhine I chip. Rhine II or III has no Tx buffer address
alignment restrictions, though.
- Reduce number of allowable number of DMA segments to 8.
- Removed the atomic(9) used in descriptor ownership managements
as it's job of bus_dmamap_sync(9).
With these change vr(4) should work on all platforms.
o Rhine uses two separated 8bits command registers to control Tx/Rx
MAC. So don't access it as a single 16bit register.
o For non-strict alignment architectures vr(4) no longer require
time-consuming copy operation for received frames to align IP
header. This greatly improves Rx performance on i386/amd64
platforms. However the alignment is still necessary for
strict-alignment platforms(e.g. sparc64). The alignment is handled
in new fuction vr_fixup_rx().
o vr_rxeof() now rejects multiple-segmented(fragmented) frames as
vr(4) is not ready to handle this situation. Datasheet said nothing
about the reason when/why it happens.
o In vr_newbuf() don't set VR_RXSTAT_FIRSTFRAG/VR_RXSTAT_LASTFRAG
bits as it's set by hardware.
o Don't pass checksum offload information to upper layer for
fragmented frames. The hardware assisted checksum is valid only
when the frame is non-fragmented IP frames. Also mark the checksum
is valid for corrupted frames such that upper layers doesn't need
to recompute the checksum with software routine.
o Removed vr_rxeoc(). RxDMA doesn't seem to need to be idle before
sending VR_CMD_RX_GO command. Previously it used to stop RxDMA
first which in turn resulted in long delays in Rx error recovery.
o Rewrote Tx completion handler.
- Always check VR_TXSTAT_OWN bit in status word prior to
inspecting other status bits in the status word.
- Collision counter updates were corrected as VT3071 or newer
ones use different bits to notify collisions.
- Unlike other chip revisions, VT86C100A uses different bit to
indicate Tx underrun. For VT3071 or newer ones, check both
VR_TXSTAT_TBUFF and VR_TXSTAT_UDF bits to see whether Tx
underrun was happend. In case of Tx underrun requeue the failed
frame and restart stalled Tx SM. Also double Tx DMA threshold
size on each failure to mitigate future Tx underruns.
- Disarm watchdog timer only if we have no queued packets,
otherwise don't touch watchdog timer.
o Rewrote interrupt handler.
- status word in Tx/Rx descriptors indicates more detailed error
state required to recover from the specific error. There is no
need to rely on interrupt status word to recover from Tx/Rx
error except PCI bus error. Other event notifications like
statistics counter overflows or link state events will be
handled in main interrupt handler.
- Don't touch VR_IMR register if we are in suspend mode. Touching
the register may hang the hardware if we are in suspended state.
Previously it seems that touching VR_IMR register in interrupt
handler was to work-around panic occurred in system shutdown
stage on SMP systems. I think that work-around would hide
root-cause of the panic and I couldn't reproduce the panic
with multiple attempts on my box.
o While padding space to meet minimum frame size, zero the pad data
in order to avoid possibly leaking sensitive data.
o Rewrote vr_start_locked().
- Don't try to queue packets if number of available Tx descriptors
are short than that of required one.
o Don't reinitialize hardware whenever media configuration is
changed. Media/link state changes are reported from mii layer if
this happens and vr_link_task() will perform necessary changes.
o Don't reinitialize hardware if only PROMISC bit was changed. Just
toggle the PROMISC bit in hardware is sufficient to reflect the
request.
o Rearrganed the IFCAP_POLLING/IFCAP_HWCSUM handling in vr_ioctl().
o Generate Tx completion interrupts for every VR_TX_INTR_THRESH-th
frames. This reduces Tx completion interrupts under heavy network
loads.
o Since vr(4) doesn't request Tx interrupts for every queued frames,
reclaim any pending descriptors not handled in Tx completion
handler before actually firing up watchdog timeouts.
o Added vr_tx_stop()/vr_rx_stop() to wait for the end of active
TxDMA/RxDMA cycles(draining). These routines are used in vr_stop()
to ensure sane state of MAC before releasing allocated Tx/Rx
buffers. vr_link_task() also takes advantage of these functions to
get to idle state prior to restarting Tx/Rx.
o Added vr_tx_start()/vr_rx_start() to restart Rx/Tx. By separating
Rx operation from Tx operation vr(4) no longer need to full-reset
the hardware in case of Tx/Rx error recovery.
o Implemented WOL.
o Added VT6105M specific register definitions. VT6105M has the
following hardware capabilities.
- Tx/Rx IP/TCP/UDP checksum offload.
- VLAN hardware tag insertion/extraction. Due to lack of information
for getting extracted VLAN tag in Rx path, VLAN hardware support
was not implemented yet.
- CAM(Content Addressable Memory) based 32 entry perfect multicast/
VLAN filtering.
- 8 priority queues.
o Implemented CAM based 32 entry perfect multicast filtering for
VT6105M. If number of multicast entry is greater than 32, vr(4)
uses traditional hash based filtering.
o Reflect real Tx/Rx descriptor structure. Previously vr(4) used to
embed other driver (private) data into these structure. This type
of embedding make it hard to work on LP64 systems.
o Removed unused vr_mii_frame structure and MII bit-baning
definitions.
o Added new PCI configuration registers that controls mii operation
and mode selection.
o Reduced number of Tx/Rx descriptors to 128 from 256. From my
testing, increasing number of descriptors above than 64 didn't help
increasing performance at all. Experimentations show 128 Rx
descriptors seems to help a lot reducing Rx FIFO overruns under
high system loads. It seems the poor Tx performance of Rhine
hardwares comes from the limitation of hardware. You wouldn't
satuarte the link with vr(4) no matter how fast CPU/large number of
descriptors are used.
o Added vr_statistics structure to hold various counter values.
No regression was reported but one variant of Rhine III(VT6105M)
found on RouterBOARD 44 does not work yet(Reported by Milan Obuch).
I hope this would be resolved in near future.
I'd like to say big thanks to Mike Tancsa who kindly donated a Rhine
hardware to me. Without his enthusiastic testing and feedbacks
overhauling vr(4) never have been possible. Also thanks to Masayuki
Murayama who provided some good comments on the hardware's internals.
This driver is result of combined effort of many users who provided
many feedbacks so I'd like to say special thanks to them.
Hardware donated by: Mike Tancsa (mike AT sentex dot net)
Reviewed by: remko (initial version)
Tested by: Mike Tancsa(x86), JoaoBR ( joao AT matik DOT com DOT br )
Marcin Wisnicki ( mwisnicki+freebsd AT gmail DOT com )
Stefan Ehmann ( shoesoft AT gmx DOT net )
Florian Smeets ( flo AT kasimir DOT com )
Phil Oleson ( oz AT nixil DOT net )
Larry Baird ( lab AT gta DOT com )
Milan Obuch ( freebsd-current AT dino DOT sk )
remko (initial version)
tdq_runq_add to select the runq rather than hoping we set it properly
when we adjusted the priority. This involves the same number of
branches as before so should perform identically without the extra
fragility.
Tested by: bz
Reviewed by: bz
the cpufreq drivers to reliably use properties of PCI devices for quirks,
etc.
- For the legacy drivers, add CPU devices via an identify routine in the
CPU driver itself rather than in the legacy driver's attach routine.
- Add CPU devices after Host-PCI bridges in the acpi bus driver.
- Change the ichss(4) driver to use pci_find_bsf() to locate the ICH and
check its device ID rather than having a bogus PCI attachment that only
checked for the ID in probe and always failed. As a side effect, you
can now kldload ichss after boot.
- Fix the ichss(4) driver to use the correct device_t for the ICH (and not
for ichss0) when doing PCI config space operations to enable SpeedStep.
MFC after: 2 weeks
Reviewed by: njl, Andriy Gapon avg of icyb.net.ua
present in cpu_feature2. Also, use CPUID2_EST rather than a magic
number.
- Don't free the ACPI settings list in detach if we are going to fail the
request. Otherwise an attempt to kldunload est would free the array
but the driver would keep trying to use it.
MFC after: 1 week
routines (V86 requests from the client and hardware interrupt handlers):
- Install trampoline real mode interrupt handlers at IDT vectors 0x20-0x2f
to handle hardware interrupts by invoking the appropriate vector (0x8-0xf
or 0x70-0x78). This allows the 8259As to use vectors 0x20-0x2f in real
mode as well as protected mode will ensuring that the master 8259A
doesn't share IDT space with CPU exceptions in protected mode.
- Since we don't need to reserve space for page tables and a page directory
anymore since dropping paging support, move the TSS and protected mode
IDT up by 16k. Grow the ring 1 link stack by 16k as a result.
- Repurpose the ring 1 link stack to be used as a real mode stack when
invoking real mode routines either via a V86 request or a hardware
interrupts. This simplifies a few things as we avoid disturbing the
original user stack.
- Add some more block comments to explain how the code interacts with the
V86 structure as this wasn't immediately obvious from the prior comments
(e.g. that we explicitly copy the seg regs for real mode out of the V86
struct onto the stack to be popped off when going into real mode, etc.).
Also, document some of the stack frames we create going to real mode and
back.
- Remove all of the virtual 86 related code including having to simulate
various instructions and BIOS calls on a trap from virtual 86 mode.
- Explicitly panic if a user client attempts to perform a V86 CALL
request that isn't a far call.
- Bump version to 1.2.
Assuming this works ok this should fix some of the long standing issues
with USB booting as well as etherboot.
MFC after: 2 weeks
Submitted by: kib (some parts from his original real mode patch)
- Only calculate timeshare priorities once per tick or when a thread is woken
from sleeping.
- Keep the ts_runq pointer valid after all priority changes.
- Call tdq_runq_add() directly from sched_switch() without passing in via
tdq_add(). We don't need to adjust loads or runqs anymore.
- Sort tdq and ts_sched according to utilization to improve cache behavior.
Sponsored by: Nokia
- Normalize the preemption/ipi setting code by introducing sched_shouldpreempt()
so the logical is identical and not repeated between tdq_notify() and
sched_setpreempt().
- In tdq_notify() don't set NEEDRESCHED as we may not actually own the thread lock
this could have caused us to lose td_flags settings.
- Garbage collect some tunables that are no longer relevant.
the NOPs used are 0x01.
While we could simply pad with EOLs (which are 0x00), rather use an
explicit 0x00 constant there to not confuse poeple with 'EOL padding'.
Put in a comment saying just that.
Problem discussed on: src-committers with andre, silby, dwhite as
follow up to the rev. 1.161 commit of tcp_var.h.
MFC after: 11 days
the appropriate bit in the DEVACTB register.
This change allows the C2 state on those systems to work as expected.
Reviewed by: njl
Submitted by: Andriy Gapon <avg at icyb.net.ua>
MFC after: 1 week
Specifically, since the delete-behind heuristic is never applied to a
device-backed object, there is no point in checking whether each of the
object's pages is fictitious. (Only device-backed objects have
fictitious pages.)
know if has siblings that need an actual probe. Introduce a specail
return value called BUS_PROBE_NOOWILDCARD. If the driver returns
this, the probe is only successful for devices that have had a
specific devclass set for them.
Reviewed by: current@, jhb@, grehan@
in*() and out*() primitives should not be used, other than by
ISA drivers. In this case they were used for memory-mapped I/O
and were not even used in the spirit of the primitives.
if netgraph reported error while delivering to destination.
Reset 'next send' counter to the last requested by peer on ack timeout
to resend all subsequest packets after lost one again without additional hints.
Solaris and AIX.
fcntl(fd, F_DUP2FD, arg) and dup2(fd, arg) are functionnaly equivalent.
Document it.
Add some regression tests (identical to the dup2(2) regression tests).
PR: 120233
Submitted by: Jukka Ukkonen
Approved by: rwaston (mentor)
MFC after: 1 month
HPT drivers would sometimes test the value of a preprocessor definition but
not always make sure that the definition existed in the first place, leading
to warnings on newer compilers. I blindly assumed the same with this driver,
and it turned out to be wrong and to enable some code that doesn't work.
process lock leading to a hang. This bug was introduced in
kern_sig.c:1.351, when the call to expand_name() was moved earlier
bit this particular error case was not updated.
It so happens that U-Boot disables the D-cache when booting
an ELF image, so this change makes sure we run with the
D-cache enabled from now on. It shows too...
While here, remove the duplicate definition of the hw.model
sysctl.
variable is set. On my Mac Mini this puts the CPU in NAP mode when
the kernel is idle and, any technical or environmental reasons
aside, avoids that I have to listen to the fan all day :-)
trashing and improve performance.
Remove waitflag argument from ng_ksocket_incoming2(), it means nothing
as function call was queued by netgraph.
Remove node validity check, as node validity guarantied by netgraph.
Update comments.
value at the requested address as a symbol. For example, "ex /S
aio_swake" prints the name of the function currently registered in
via aio_swake hook.
The change as committed differs slightly from the patch in the PR,
as I force the size of the retrieved value (and the automatic
address increment) to be sizeof(void *). This seems to provide
the most useful auto-increment behavior, and defaults using the
default size (4), which is not sizeof(void *) on 64-bit platforms.
MFC after: 3 days
PR: 57976
Submitted by: Dan Strick <strick at covad.net>
for all network interfaces, not just ethernet-like ones.
Upgrade it to a louder WARNING and be explicit that the flag is obsolete.
Support for IFF_NEEDSGIANT will be removed in a few months (see arch@ for
details) and will not appear in 8.0.
Upgrade if_watchdog to a WARNING.
> 0 rather than >= 0, or we will panic when trying to deliver the signal.
MFC after: 3 days
PR: 100802
Submitted by: Valerio Daelli <valerio.daelli at gmail.com>
to flush the TLB instead of hardcoding a size of 33 pages. Apertures of
32MB and 64MB only use a 16 page GATT and an aperture of 128MB only uses
a 32 page GATT, so without this the code could walk off the end of the
pointer and cause a page fault if the next page was unmapped. Also, for
aperture sizes > 128MB, not all of the pages would be read. The Linux
driver has the same bug.
MFC after: 1 week
Tested by: Frédéric PRACA frederic.praca of freebsd-fr.org
hold the newline and nul terminator. Otherwise, there are cases where
garbage may end up in the command history due to a lack of a nul
terminator, or input may end up without room for a newline.
MFC after: 3 days
PR: 119079
Submitted by: Michael Plass <mfp49_freebsd@plass-family.net>
TCP/UDP checksum in driver for short frames. For frames that requires
hardware VLAN tag insertion, the checksum offload trick does not
work due to changes of checksum offset in mbuf after the VLAN tag.
Disable hardware checksum offload for VLAN interface to fix the bug.
Reported by: Christopher Cowart < ccowart AT rescomp DOT berkeley DOT edu >
Tested by: Christopher Cowart < ccowart AT rescomp DOT berkeley DOT edu >
MFC after: 5 days
returns EINVAL. Right now we return 0 or success for invalid commands,
which could be quite problematic in certain conditions.
MFC after: 1 week
Discussed with: rwatson
revision 1.6
date: 2004/08/21 18:50:34; author: alc; state: Exp; lines: +3 -1
Properly free the temporary sf_buf in uiomove_fromphys() if a copyin or
copyout fails.
Obtained from: DragonFlyBSD
Spotted out by: Mark Tinguely
MFC After: 3 days
restrict the utilization of direct pointers to the content of
ip packet. These modifications are functionally nop()s thus
can be merged with no side effects.
- Set M_BCAST|M_MCAST for incoming frames
- Send the frame to a local interface if the bridge returns the mbuf
Submitted by: Eugene Grosbein
Tested by: Boris Kochergin
private to the kernel, some ports define _KERNEL and include this
header. While arguably this is wrong, it's also reality. By having
the MD fields last, architectures that have CPU-specific variations
of PCPU_MD_FIELDS will at least have the MI fields at a constant
offset. Of course, having all MI fields first helps kernel debugging
as well, so this is not a change without some benefits to us.
This change does not result in an ABI breakage, because this header
is not part of the ABI. Recompilation of lsof is required though :-)
used in the kernel only (by virtue of checking for _KERNEL),
ports like lsof (part of gtop) cheat. It sets _KERNEL, but does
not set either AIM or E500. As such, PCPU_MD_FIELDS didn't get
defined and the build broke.
The catch-all is to define PCPU_MD_FIELDS with a dummy integer
when at the end of line we ended up without a definition for it.
the input field from the current cursor location, rather than the end of
the input line, as the cursor may not be at the end of the line.
Otherwise, we may overshoot, overwriting a bit of the previous line and
failing to fully overwrite the current line.
MFC after: 3 days
PR: 119079
Submitted by: Michael Plass <mfp49_freebsd@plass-family.net>
allocator for jumbo frame. Also remove unneeded jlist lock which
is no longer required to protect jumbo buffers.
With these changes jumbo frame performance of nfe(4) was slightly
increased and users should not encounter jumbo buffer allocation
failure anymore.
to avoid terrible unpredicted effects for netgraph operation of their
exhaustion while allocating control messages.
Add separate configurable 512 items limit for data items allocation
for DoS/overload protection.
Discussed with: julian
it's probed first. The PowerPC platform code deals with everything.
As such, probe devices in order of their location in the memory map.
o Refactor the ocpbus_alloc_resource for readability and make sure we
set the RID in the resource as per the new convention.
- Even for the PCI Express host controller we need to use bus 0
for configuration space accesses to devices directly on the
host controller's bus.
- Pass the maximum number of slots to pci_ocp_init() because the
caller knows how many slots the bus has. Previously a PCI or
PCI-X bus underneath a PCI Express host controller would not
be enumerated properly.
o Pull the interrupt routing logic out of pci_ocp_init() and into
its own function. The logic is not quite right and is expected
to be a bit more complex.
o Fix/add support for PCI domains. The PCI domain is the unit
number as per other PCI host controller drivers. As such, we
can use logical bus numbers again and don't have to guarantee
globally unique bus numbers. Remove pci_ocp_busnr. Return the
highest bus number ito the caller of pci_ocp_init() now that
we don't have a global variable anymore.
o BAR programming fixes:
- Non-type0 headers have at most 1 BAR, not 0.
- First write ~0 to the BAR in question and then read back its
size.
Obtained from: Juniper Networks (mostly)
It is normally initialized by ffs_statfs() after ffs_mount finished.
The extattr autostart code calls the ufs_lookup(), that uses value above
to iterate over the directory blocks, see bmask initialization in the
ufs_lookup() and ufsdirhash. Having the filesystem with root directory
spanning more then one block would result in reading a random kernel
memory.
PR: kern/120781
Test case provided by: rwatson
MFC after: 1 week
expressions on i386 are evaluated in the range of the long double type,
so this is wrong in a different but hopefully less worse way than
before. Since expressions are evaluated in long double registers,
there is no runtime cost to using long double instead of double to
declare intermediate values (except in cases where this avoids compiler
bugs), and by careful use of float_t or double_t it is possible to
avoid some of the compiler bugs in this area, provided these types are
declared as long double.
I was going to change float.h to be less broken and more usable in
combination with the change here (in particular, it is more necessary
to know the effective number of bits in a double_t when double_t !=
double, since DBL_MANT_DIG no longer logically gives this, and
LDBL_MANT_DIG doesn't give it either with FreeBSD-i386's default
rounding precision. However, this was too hard for now. In particular,
LDBL_MANT_DIG is used a lot in libm, so it cannot be changed. One
thing that is completely broken now is LDBL_MAX. This may have sort
of worked when it was changed from DBL_MAX in 2002 (adding 0 to it at
runtime gave +Inf, but you could at least compare with it), but starting
with gcc-3.3.1 in 2003, it is always +Inf due to evaluating it at
compile time in the default rounding precision.
