i386: Use DEV_HYPERV to enable HyperV APIC vector

This avoids requiring both 'device hyperv' and 'options HYPERV' for
kernel configs. Instead, just 'device hyperv' can now be used
matching the kernel configuration used for amd64.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D44783

uart: Support EARLY_PRINTF on x86 for port-mapped COM ports

Support early printf for the ns8250 uart driver. Adding
options UART_NS8250_EARLY_PORT=0xYYY
options EARLY_PRINTF
to your kernel config will enable it. The code is rather simple minded,
so caveat emptor. This will enable printf before cninit. cninit
automatically disables this and switches to the real routine. It only
works for port-mapped COM ports, and only if you know the port's address
at compile time. It's intended for be a debugging aide, not a general
purpose thing.

Sponsored by: Netflix
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D42306

sys: Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

x86: Add MPTABLE_LINUX_BUG_COMPAT option

Linux has two bugs in its handling of the x86 MP table:
1. It assumes that there is always 640 kB of base memory, and looks for
the MP table in the top kB of this even if the memory map indicates
that memory location does not exist.
2. It ignores that entry_count field and instead iterates through the
MP table by scanning until it runs out of bytes in the table.

The Firecracker VM (and probably other related VMs) relies on both of
these bugs. With the MPTABLE_LINUX_BUG_COMPAT option, we search for
the MP table at address 639k even if that isn't in the memory map; and
replace a zeroed entry_count with a value computed from scanning the
table until we run out of table bytes.

Reviewed by: imp
Sponsored by: https://www.patreon.com/cperciva
Differential Revision: https://reviews.freebsd.org/D35799

Add NO_LEGACY_PCIB kernel option to i386, amd64

On systems without a PCI bus, legacy_pcib_identify by default creates
one anyway:
legacy_pcib_identify: no bridge found, adding pcib0 anyway

This commit adds a kernel option NO_LEGACY_PCIB which disables this,
allowing systems to be fully PCI-free.

Reviewed by: imp
Sponsored by: https://www.patreon.com/cperciva
Differential Revision: https://reviews.freebsd.org/D35798

x86: remove MP_WATCHDOG

It does not work with ULE, which is the default scheduler for over a
decade.

Reviewed by: emaste, kib
Differential Revision: https://reviews.freebsd.org/D36094

Retire synchronous PPP kernel driver sppp(4).

The last two drivers that required sppp are cp(4) and ce(4).

These devices are still produced and can be purchased
at Cronyx <http://cronyx.ru/hardware/wan.html>.

Since Roman Kurakin <rik@FreeBSD.org> has quit them, they no
longer support FreeBSD officially. Later they have dropped
support for Linux drivers to. As of mid-2020 they don't even
have a developer to maintain their Windows driver. However,
their support verbally told me that they could provide aid to
a FreeBSD developer with documentaion in case if there appears
a new customer for their devices.

These drivers have a feature to not use sppp(4) and create an
interface, but instead expose the device as netgraph(4) node.
Then, you can attach ng_ppp(4) with help of ports/net/mpd5 on
top of the node and get your synchronous PPP. Alternatively
you can attach ng_frame_relay(4) or ng_cisco(4) for HDLC.
Actually, last time I used cp(4) back in 2004, using netgraph(4)
instead of sppp(4) was already the right way to do.

Thus, remove the sppp(4) related part of the drivers and enable
by default the negraph(4) part. Further maintenance of these
drivers in the tree shouldn't be a big deal.

While doing that, remove some cruft and enable cp(4) compilation
on amd64. The ce(4) for some unknown reason marks its internal
DDK functions with __attribute__ fastcall, which most likely is
safe to remove, but without hardware I'm not going to do that, so
ce(4) remains i386-only.

Reviewed by: emaste, imp, donner
Differential Revision: https://reviews.freebsd.org/D32590
See also: https://reviews.freebsd.org/D23928

hyperv: Fix vmbus after the i386 4/4 split

The vmbus ISR needs to live in a trampoline. Dynamically allocating a
trampoline at driver initialization time poses some difficulties due to
the fact that the KENTER macro assumes that the offset relative to
tramp_idleptd is fixed at static link time. Another problem is that
native_lapic_ipi_alloc() uses setidt(), which assumes a fixed trampoline
offset.

Rather than fight this, move the Hyper-V ISR to i386/exception.s. Add a
new HYPERV kernel option to make this optional, and configure it by
default on i386. This is sufficient to make use of vmbus(4) after the
4/4 split. Note that vmbus cannot be loaded dynamically and both the
HYPERV option and device must be configured together. I think this is
not too onerous a requirement, since vmbus(4) was previously
non-functional.

Reported by: Harry Schmalzbauer <freebsd@omnilan.de>
Tested by: Harry Schmalzbauer <freebsd@omnilan.de>
Reviewed by: whu, kib
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D30577

x86: remove gcov kernel support

Reviewed by: jhb
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D29529

Remove stale references to opt_sio.h

The sio(4) driver was removed entirely in 2019, commit 71f0077631fa.

Reviewed by: imp
Differential Revision: https://reviews.freebsd.org/D28929

Remove ndis(4) remnants from kernel configs

Unbreaks LINT kernels.

i386: Merge PAE and non-PAE pmaps into same kernel.

Effectively all i386 kernels now have two pmaps compiled in: one
managing PAE pagetables, and another non-PAE. The implementation is
selected at cold time depending on the CPU features. The vm_paddr_t is
always 64bit now. As result, nx bit can be used on all capable CPUs.

Option PAE only affects the bus_addr_t: it is still 32bit for non-PAE
configs, for drivers compatibility. Kernel layout, esp. max kernel
address, low memory PDEs and max user address (same as trampoline
start) are now same for PAE and for non-PAE regardless of the type of
page tables used.

Non-PAE kernel (when using PAE pagetables) can handle physical memory
up to 24G now, larger memory requires re-tuning the KVA consumers and
instead the code caps the maximum at 24G. Unfortunately, a lot of
drivers do not use busdma(9) properly so by default even 4G barrier is
not easy. There are two tunables added: hw.above4g_allow and
hw.above24g_allow, the first one is kept enabled for now to evaluate
the status on HEAD, second is only for dev use.

i386 now creates three freelists if there is any memory above 4G, to
allow proper bounce pages allocation. Also, VM_KMEM_SIZE_SCALE changed
from 3 to 1.

The PAE_TABLES kernel config option is retired.

In collaboarion with: pho
Discussed with: emaste
Reviewed by: markj
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential revision: https://reviews.freebsd.org/D18894

Remove iBCS2, part2: general kernel

Reviewed by: kib (previous version)
Sponsored by: The FreeBSD Foundation

Remove SVR4 (System V Release 4) binary compatibility support.

UNIX System V Release 4 is operating system released in 1988. It ceased
to exist in early 2000-s.

For i386, remove config options CPU_DISABLE_CMPXCHG, CPU_DISABLE_SSE
and device npx.

This means that FPU is always initialized and handled when available,
and SSE+ register file and exception are handled when available. This
makes the kernel FPU code much easier to maintain by the cost of
slight bloat for CPUs older than 25 years.

CPU_DISABLE_CMPXCHG outlived its usefulness, see the removed comment
explaining the original purpose.

Suggested by and discussed with: bde
Tested by: pho
Sponsored by: The FreeBSD Foundation
MFC after: 3 weeks

hyperv: Deprecate HYPERV option by moving Hyper-V IDT vector into vmbus

Submitted by: Jun Su <junsu microsoft com>
Reviewed by: jhb, kib, sephe
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D5910

Remove support for Xen PV domU kernels. Support for HVM domU kernels
remains. Xen is planning to phase out support for PV upstream since it
is harder to maintain and has more overhead. Modern x86 CPUs include
virtualization extensions that support HVM guests instead of PV guests.
In addition, the PV code was i386 only and not as well maintained recently
as the HVM code.
- Remove the i386-only NATIVE option that was used to disable certain
components for PV kernels. These components are now standard as they
are on amd64.
- Remove !XENHVM bits from PV drivers.
- Remove various shims required for XEN (e.g. PT_UPDATES_FLUSH, LOAD_CR3,
etc.)
- Remove duplicate copy of <xen/features.h>.
- Remove unused, i386-only xenstored.h.

Differential Revision: https://reviews.freebsd.org/D2362
Reviewed by: royger
Tested by: royger (i386/amd64 HVM domU and amd64 PVH dom0)
Relnotes: yes

Microsoft vmbus, storage and other related driver enhancements for HyperV.
- Vmbus multi channel support.
- Vector interrupt support.
- Signal optimization.
- Storvsc driver performance improvement.
- Scatter and gather support for storvsc driver.
- Minor bug fix for KVP driver.
Thanks royger, jhb and delphij from FreeBSD community for the reviews
and comments. Also thanks Hovy Xu from NetApp for the contributions to
the storvsc driver.

PR: 195238
Submitted by: whu
Reviewed by: royger, jhb, delphij
Approved by: royger
MFC after: 2 weeks
Relnotes: yes
Sponsored by: Microsoft OSTC

Add config option PAE_TABLES for the i386 kernel. It switches pmap to
use PAE format for the page tables, but does not incur other
consequences of the full PAE config. In particular, vm_paddr_t and
bus_addr_t are left 32bit, and max supported memory is still limited
by 4GB.

The option allows to have nx permissions for memory mappings on i386
kernel, while keeping the usual i386 KBI and avoiding the kernel data
sizing problems typical for the PAE config.

Intel documented that the PAE format for page tables is available
starting with the Pentium Pro, but it is possible that the plain
Pentium CPUs have the required support (Appendix H). The goal is to
enable the option and non-exec mappings on i386 for the GENERIC
kernel. Anybody wanting a useful system on 486, have to reconfigure
the modern i386 kernel anyway.

Discussed with: alc, jhb
Sponsored by: The FreeBSD Foundation
MFC after: 2 weeks

Garbage collect the asr driver. Hardware for it has not been produced in
roughly 10 years, and the driver has not enjoyed any significant maintenance
since long before that. Despite well-meaning efforts from a number of
people, myself included, it never made the jump to 64-bit and was relegated
to the back-corners of i386. Now its frailty is hampering forward progress
with Clang. Any renewed engineering efforts are of course welcome and can
happen outside of the tree. No MFC of this is planned.

imagact_binmisc builds for all supported architectures, so enable it for all.

Any bugs in execution will be dealt with as they crop up.

MFC after: 3 weeks
Relnotes: Yes

Actually, since this is what I thought I was doing, only allow the
binmisc code to be build on amd64/i386 for the kernel.

Update NOTES with some indication of what this code is used for.

Pointed out by jhb@ ... thanks!

Submitted by: jhb@

The PADLOCK_RNG and RDRAND_RNG kernel options are now devices.
Thus "device padlock_rng" and "device rdrand_rng" should be
used instead of "options PADLOCK_RNG" & "options RDRAND_RNG".

Requested by: so@ (des)
Submitted by: obrien, arthurmesh@gmail.com
Obtained from: Juniper Networks

Rename the IVY_RNG option to RDRAND_RNG.

Based on submission by: Arthur Mesh <arthurmesh@gmail.com>
MFC after: 2 weeks

Add support for new Intel on-CPU Bull Mountain random number
generator, found on IvyBridge and supposedly later CPUs, accessible
with RDRAND instruction.

From the Intel whitepapers and articles about Bull Mountain, it seems
that we do not need to perform post-processing of RDRAND results, like
AES-encryption of the data with random IV and keys, which was done for
Padlock. Intel claims that sanitization is performed in hardware.

Make both Padlock and Bull Mountain random generators support code
covered by kernel config options, for the benefit of people who prefer
minimal kernels. Also add the tunables to disable hardware generator
even if detected.

Reviewed by: markm, secteam (simon)
Tested by: bapt, Michael Moll <kvedulv@kvedulv.de>
MFC after: 3 weeks

Disable detailed PV entry accounting by default. Add a config option
to enable it.

MFC after: 1 week

Add isci(4) driver for amd64 and i386 targets.

The isci driver is for the integrated SAS controller in the Intel C600
(Patsburg) chipset. Source files in sys/dev/isci directory are
FreeBSD-specific, and sys/dev/isci/scil subdirectory contains
an OS-agnostic library (SCIL) published by Intel to control the SAS
controller. This library is used primarily as-is in this driver, with
some post-processing to better integrate into the kernel build
environment.

isci.4 and a README in the sys/dev/isci directory contain a few
additional details.

This driver is only built for amd64 and i386 targets.

Sponsored by: Intel
Reviewed by: scottl
Approved by: scottl

Make "options XENHVM" compile for i386, not just amd64 -- a largely
mechanical change. This opens the door for using PV device drivers
under Xen HVM on i386, as well as more general harmonisation of i386
and amd64 Xen support in FreeBSD.

Reviewed by: cperciva
MFC after: 3 weeks

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

MFC r199852, r202387, r202441, r202534:
Handling all the three clocks with the LAPIC may lead to aliasing for
softclock and profclock.
Revert the change when the LAPIC started taking charge of all three of
them.

Sponsored by: Sandvine Incorporated

MFC 204972:
Make NKPT a kernel option on i386 so that it can be set to a non-default
value from kernel config files.

Make NKPT a kernel option on i386 so that it can be set to a non-default
value from kernel config files.

Tested by: Charles Sprickman spork of bway net
MFC after: 2 weeks

Handling all the three clocks (hardclock, softclock, profclock) with the
LAPIC may lead to aliasing for softclock and profclock because frequencies
are sized in order to fit mainly hardclock.
atrtc used to take care of the softclock and profclock and it does still
do, if the LAPIC can't handle the clocks properly.

Revert the change when the LAPIC started taking charge of all three of
them and let atrtc handle softclock and profclock if not explicitly
requested. Such request can be made setting != 0 the new tunable
machdep.lapic_allclocks or if the new device ATPIC is not present
within the i386 kernel config (atrtc is linked to atpic presence).

Diagnosed by: Sandvine Incorporated
Reviewed by: jhb, emaste
Sponsored by: Sandvine Incorporated
MFC: 3 weeks

MFC r196196:

* Completely remove the option STOP_NMI from the kernel. This option
has proven to have a good effect when entering KDB by using a NMI,
but it completely violates all the good rules about interrupts
disabled while holding a spinlock in other occasions. This can be the
cause of deadlocks on events where a normal IPI_STOP is expected.
* Add an new IPI called IPI_STOP_HARD on all the supported architectures.
This IPI is responsible for sending a stop message among CPUs using a
privileged channel when disponible. In other cases it just does match a
normal IPI_STOP.
Right now the IPI_STOP_HARD functionality uses a NMI on ia32 and amd64
architectures, while on the other has a normal IPI_STOP effect. It is
responsibility of maintainers to eventually implement an hard stop
when necessary and possible.
* Use the new IPI facility in order to implement a new userend SMP kernel
function called stop_cpus_hard(). That is specular to stop_cpu() but
it does use the privileged channel for the stopping facility.
* Let KDB use the newly introduced function stop_cpus_hard() and leave
stop_cpus() for all the other cases
* Disable interrupts on CPU0 when starting the process of APs suspension.
* Style cleanup and comments adding

This patch should fix the reboot/shutdown deadlocks many users are
constantly reporting on mailing lists.

Please don't forget to update your config file with the STOP_NMI
option removal

Reviewed by: jhb
Tested by: pho, bz, rink
Approved by: re (kib)

* Completely Remove the option STOP_NMI from the kernel. This option
has proven to have a good effect when entering KDB by using a NMI,
but it completely violates all the good rules about interrupts
disabled while holding a spinlock in other occasions. This can be the
cause of deadlocks on events where a normal IPI_STOP is expected.
* Adds an new IPI called IPI_STOP_HARD on all the supported architectures.
This IPI is responsible for sending a stop message among CPUs using a
privileged channel when disponible. In other cases it just does match a
normal IPI_STOP.
Right now the IPI_STOP_HARD functionality uses a NMI on ia32 and amd64
architectures, while on the other has a normal IPI_STOP effect. It is
responsibility of maintainers to eventually implement an hard stop
when necessary and possible.
* Use the new IPI facility in order to implement a new userend SMP kernel
function called stop_cpus_hard(). That is specular to stop_cpu() but
it does use the privileged channel for the stopping facility.
* Let KDB use the newly introduced function stop_cpus_hard() and leave
stop_cpus() for all the other cases
* Disable interrupts on CPU0 when starting the process of APs suspension.
* Style cleanup and comments adding

This patch should fix the reboot/shutdown deadlocks many users are
constantly reporting on mailing lists.

Please don't forget to update your config file with the STOP_NMI
option removal

Reviewed by: jhb
Tested by: pho, bz, rink
Approved by: re (kib)

Fix AGP debugging code:
- correct format strings
- fill opt_agp.h if AGP_DEBUG is defined
- bring AGP_DEBUG to LINT by mentioning it in NOTES

This should hopefully fix a warning that was...

Found by: Coverity Prevent(tm)
CID: 3676
Tested on: amd64, i386

- Import the HEAD csup code which is the basis for the cvsmode work.

Integrate configuration bits for compling xen.

MFC after: 1 month

Remove obselete PECOFF image activator support.

PRs assigned at the time of removal: kern/80742

Discussed on: freebsd-current (silence), IRC
Tested by: make universe
Approved by: cognet (mentor)

Remove ISDN4BSD (I4B) from HEAD as it is not MPSAFE and
parts relied on the now removed NET_NEEDS_GIANT.
Most of I4B has been disconnected from the build
since July 2007 in HEAD/RELENG_7.

This is what was removed:
- configuration in /etc/isdn
- examples
- man pages
- kernel configuration
- sys/i4b (drivers, layers, include files)
- user space tools
- i4b support from ppp
- further documentation

Discussed with: rwatson, re

Back in the good old days, PC's had random pieces of rock for
frequency generation and what frequency the generated was anyones
guess.

In general the 32.768kHz RTC clock x-tal was the best, because that
was a regular wrist-watch Xtal, whereas the X-tal generating the
ISA bus frequency was much lower quality, often costing as much as
several cents a piece, so it made good sense to check the ISA bus
frequency against the RTC clock.

The other relevant property of those machines, is that they
typically had no more than 16MB RAM.

These days, CPU chips croak if their clocks are not tightly within
specs and all necessary frequencies are derived from the master
crystal by means if PLL's.

Considering that it takes on average 1.5 second to calibrate the
frequency of the i8254 counter, that more likely than not, we will
not actually use the result of the calibration, and as the final
clincher, we seldom use the i8254 for anything besides BEL in
syscons anyway, it has become time to drop the calibration code.

If you need to tell the system what frequency your i8254 runs,
you can do so from the loader using hw.i8254.freq or using the
sysctl kern.timecounter.tc.i8254.frequency.

Allow the sio acpi attachment to be disabled (ie: use hints only). This
hack means you can get the units and flags to match up more easily with
serial consoles on machines with acpi tables that cause the com ports
to be probed in the wrong order (and hence get the wrong sio unit number).

This replaces the common alternative hack of editing the code to comment
out the acpi attachment. This could go away entirely when device wiring
patches are committed.

Temporary disconnect i4bing, i4bisppp and i4bipr from the build for
the 7.0 timeframe.

This is needed because I4B is not locked and NET_NEEDS_GIANT goes away.

The plan is to lock I4B and bring everything back for 7.1.

Approved by: re (kensmith)

Remove sio(4) and related options from MI files to amd64, i386
and pc98 MD files. Remove nodevice and nooption lines specific
to sio(4) from ia64, powerpc and sparc64 NOTES. There were no
such lines for arm yet.
sio(4) is usable on less than half the platforms, not counting
a future mips platform. Its presence in MI files is therefore
increasingly becoming a burden.

Send the pcvt(4) driver off to retirement.

Fix LINSYSFS in the platform options files that I missed from the platform
split out change.

- change the example of compiling only specific modules to not contain
the linux module, since it is not cross-platform
- move linprocfs from "files" and "options" to architecture specific files,
since it only makes sense to build this for those architectures, where we
also have a linuxolator
- disable the build of the linuxolator on our tier-2 architecture "Alpha":
* we don't have a linux_base port which supports Alpha and at the
same time is not outdated/obsoleted upstream/in a good condition/
currently working
* the upcomming new default linux base port is based upon Fedora
Core 3 (security support via http://www.fedoralegacy.org), which
isn't available for Alpha (like the current default linux base
port which is based upon Red Hat 8)
* nobody answered my request for testing it ~1 month ago on
current@ and alpha@ (it doesn't surprises me, see above)
* a SoC student wouldn't have to waste time on something which
nobody is willing to test

This does not remove the alpha specific MD files of the linuxolator yet.

Discussed on: arch (mostly silence)
Spiritual support by: scottl

o Move ISA specific code from ppc.c to ppc_isa.c -- a bus front-
end for isa(4).
o Add a seperate bus frontend for acpi(4) and allow ISA DMA for
it when ISA is configured in the kernel. This allows acpi(4)
attachments in non-ISA configurations, as is possible for ia64.
o Add a seperate bus frontend for pci(4) and detect known single
port parallel cards.
o Merge PC98 specific changes under pc98/cbus into the MI driver.
The changes are minor enough for conditional compilation and
in this form invites better abstraction.
o Have ppc(4) usabled on all platforms, now that ISA specifics
are untangled enough.

Move XBOX option to options. While it is only valid on i386,
syscons_isa is shared with other machines.

Remove all redundant option file names that don't hurt readability.

Add experimental BPF Just-In-Time compiler for amd64 and i386.

Use the following kernel configuration option to enable:

options BPF_JITTER

If you want to use bpf_filter() instead (e. g., debugging), do:

sysctl net.bpf.jitter.enable=0

to turn it off.

Currently BIOCSETWF and bpf_mtap2() are unsupported, and bpf_mtap() is
partially supported because 1) no need, 2) avoid expensive m_copydata(9).

Obtained from: WinPcap 3.1 (for i386)

Sort.

Make COUNT_IPIS and COUNT_XINVLTLB_HITS real kernel options and take
them out of machine/smptests.h.

Add support for XBOX to the FreeBSD port. The xbox architecture is
nearly identical to wintel/ia32, with a couple of tweaks. Since it is
so similar to ia32, it is optionally added to a i386 kernel. This
port is preliminary, but seems to work well. Further improvements
will improve the interaction with syscons(4), port Linux nforce driver
and future versions of the xbox.

This supports the 64MB and 128MB boxes. You'll need the most recent
CVS version of Cromwell (the Linux BIOS for the XBOX) to boot.

Rink will be maintaining this port, and is interested in feedback.
He's setup a website http://xbox-bsd.nl to report the latest
developments.

Any silly mistakes are my fault.

Submitted by: Rink P.W. Springer rink at stack dot nl and
Ed Schouten ed at fxq dot nl

Rename the KDB_STOP_NMI kernel option to STOP_NMI and make it apply to all
IPI_STOP IPIs.
- Change the i386 and amd64 MD IPI code to send an NMI if STOP_NMI is
enabled if an attempt is made to send an IPI_STOP IPI. If the kernel
option is enabled, there is also a sysctl to change the behavior at
runtime (debug.stop_cpus_with_nmi which defaults to enabled). This
includes removing stop_cpus_nmi() and making ipi_nmi_selected() a
private function for i386 and amd64.
- Fix ipi_all(), ipi_all_but_self(), and ipi_self() on i386 and amd64 to
properly handle bitmapped IPIs as well as IPI_STOP IPIs when STOP_NMI is
enabled.
- Fix ipi_nmi_handler() to execute the restart function on the first CPU
that is restarted making use of atomic_readandclear() rather than
assuming that the BSP is always included in the set of restarted CPUs.
Also, the NMI handler didn't clear the function pointer meaning that
subsequent stop and restarts could execute the function again.
- Define a new macro HAVE_STOPPEDPCBS on i386 and amd64 to control the use
of stoppedpcbs[] and always enable it for i386 and amd64 instead of
being dependent on KDB_STOP_NMI. It works fine in both the NMI and
non-NMI cases.

Remove the CPU_ENABLE_SSE option from the i386 and pc98 architectures,
as they are already default for I686_CPU for almost 3 years, and
CPU_DISABLE_SSE always disables it. On the other hand, CPU_ENABLE_SSE
does not work for I486_CPU and I586_CPU.

This commit has:
- Removed the option from conf/options.*
- Removed the option and comments from MD NOTES files
- Simplified the CPU_ENABLE_SSE ifdef's so they don't
deal with CPU_ENABLE_SSE from kernel configuration. (*)

For most users, this commit should be largely no-op. If you used to
place CPU_ENABLE_SSE into your kernel configuration for some reason,
it is time to remove it.

(*) The ifdef's of CPU_ENABLE_SSE are not removed at this point, since
we need to change it to !defined(CPU_DISABLE_SSE) && defined(I686_CPU),
not just !defined(CPU_DISABLE_SSE), if we really want to do so.

Discussed on: -arch
Approved by: re (scottl)

Move the KDB_STOP_NMI option from opt_global.h to opt_kdb.h

Approved by: re

Connect reiserfs build to every platforms, not only i386 and pc98.

Reviewed by: mux (mentor)
Approved by: re (dougb)

Connect the ReiserFS filesystem to the build (i386 only).

Approved by: mux (mentor)

- Move the NPX_DEBUG option to options.{i386,pc98} and use opt_npx.h.
- Move npx related defines to {i386,pc98}/include/npx.h to remove #include
{isa,cbus}.h.

Implement an alternate method to stop CPUs when entering DDB. Normally we use
a regular IPI vector, but this vector is blocked when interrupts are disabled.
With "options KDB_STOP_NMI" and debug.kdb.stop_cpus_with_nmi set, KDB will
send an NMI to each CPU instead. The code also has a context-stuffing
feature which helps ddb extract the state of processes running on the
stopped CPUs.

KDB_STOP_NMI is only useful with SMP and complains if SMP is not defined.
This feature only applies to i386 and amd64 at the moment, but could be
used on other architectures with the appropriate MD bits.

Submitted by: ups

Remove support for mixed mode altogether now that we no longer use IRQ 0
when using an APIC. This simplifies the APIC code somewhat and also allows
us to be pedantically more compliant with ACPI which mandates no use of
mixed mode.

Bring back some of the ioctl junk that was removed in rev 1.59 as a
i386-only kernel option, ASR_COMPAT, and under BURN_BRIDGES.
It is really ugly, but raidutils depends on it.

Discussed with: scottl

Remove CPU_ENABLE_TCC and hook the cpufreq p4tcc up to the build.

Initiate deorbit burn sequence for 80386 support in FreeBSD: Remove
80386 (I386_CPU) support from the kernel.

Unconditionally support the AMD64 GART HW.

AMD64 on-CPU GART support.
This also applies to AMD64 HW running 'i386' OS.

Submitted by: Jung-uk Kim <jkim@niksun.com>
Integration by: obrien

Add an "options MP_WATCHDOG" to i386. This option allows one of the
logical CPUs on a system to be used as a dedicated watchdog to cause a
drop to the debugger and/or generate an NMI to the boot processor if
the kernel ceases to respond. A sysctl enables the watchdog running
out of the processor's idle thread; a callout is launched to reset a
timer in the watchdog. If the callout fails to reset the timer for ten
seconds, the watchdog will fire. The sysctl allows you to select which
CPU will run the watchdog.

A sample "debug.leak_schedlock" is included, which causes a sysctl to
spin holding sched_lock in order to trigger the watchdog. On my Xeons,
the watchdog is able to detect this failure mode and break into the
debugger, which cannot otherwise be done without an NMI button.

This option does not currently work with sched_ule due to ule's push
notion of scheduling, similar to machdep.hlt_logical_cpus failing to
work with that scheduler.

On face value, this might seem somewhat inefficient, but there are a
lot of dual-processor Xeons with HTT around, so using one as a watchdog
for testing is not as inefficient as one might fear.

Remove isa compat stuff.

Only cy, bs and wd in the tree still use it. I have a replacement for
cy that I need to test on ISA and PCI cards. bs and wd are pc98 only
drivers that appear to no longer be necessary. I'll be removing them
when I hear back from the pc98 people.

Fixed some style bugs (insertion sort errors, tab lossage, and ornation
of EOF).

Move LongRun support out of identcpu.c, where it hardly belongs, into its
own file and make it opt-in, not mandatory, depending on CPU_ENABLE_LONGRUN
config(8) option.

PR:
Submitted by:
Reviewed by:
Approved by:
Obtained from:
Discussed with: nate
MFC after: 2 weeks

Add missing options from pcvt_conf.h to options.i386. This
allows the kernel build to survive config when these options
are specified in the config file.

Reviewed by: hm
Approved by: njl (mentor)

Add new CPU_ENABLE_TCC option, from NOTES:

CPU_ENABLE_TCC enables Thermal Control Circuitry (TCC) found in some
Pentium(tm) 4 and (possibly) later CPUs. When enabled and detected,
TCC allows to restrict power consumption by using machdep.cpuperf*
sysctls. This operates independently of SpeedStep and is useful on
systems where other mechanisms such as apm(4) or acpi(4) don't work.

Given the fact that many, even modern, notebooks don't work properly
with Intel ACPI, this is indeed very useful option for notebook owners.

Obtained from: OpenBSD
MFC after: 2 weeks

Add the NDISAPI option.

Garbage-collected CLK_USE_TSC_CALIBRATION.

i386/conf/NOTES, pc98/conf/NOTES:
Fixed the descriptions of the other CLK_* options.

The DEV_ACPI option is no longer used, so g/c it.

Connect the cx driver to its new location in the tree.
Update notes to reflect that cx is no longer a counted device
Update options for new cx option
# commented out ELAN_PPS and ELAN_XTAL since they produced errors

Submitted by: rik@cronyx.ru
Approved by: re@ <scottl>

Rename the ELAN_* options to CPU_ELAN_* according the the brucification.

This commit was forgotten a few days ago.

Approved by: re@

Disable probing of HTT CPUs by default for the MP Table case. HTT CPUs
should only be used if they are enabled in the BIOS. Now that we support
enumerating CPUs using the ACPI MADT, any HTT machine using ACPI should
respect the BIOS setting. For HTT machines with ACPI disabled in the
kernel, the MPTABLE_FORCE_HTT kernel option can be used to try to probe HTT
CPUs like have done in the past for the MP Table case. This option should
only be enabled if HTT is enabled in the BIOS.

Fixed insertion sort errors in the opt_cpu.h section.

Removed banal comments about ELAN*. Complain about ELAN* being misnamed
instead (so that these options are not obviously related to a CPU and
don't sort with CPU_ELAN).

Complain about CPU_DISABLE_CMPXCHG being in the wrong namespace.

- Remove APIC_IO option.
- Add NO_MIXED_MODE, DEV_ACPI, and DEV_APIC options.

Introduce new CPU_SOEKRIS option to tell soekris hardware from other
hardware based on similar chipsets.

Fixup the sorting of some of the options. DISABLE_P* are still out of
order to keep all of the opt_pmap.h options together.

Detect Geode CPUs and initialize the 27MHz timecounter "Geode".

This timecounter is 2usec faster than the i8254 and has 22 times
better resolution.

EISA_SLOTS is mandantory to get opt_eisa.h
Put it into MI files.

Initiate de-orbit burn for fpu-less operation. 386+387 is still
theoretically supportable, but you'd really be happier with FreeBSD 2.1.8
on it.

unifdef -DLAZY_SWITCH and start to tidy up the associated glue.

Tidy up leftover lazy_switch instrumentation that is no longer needed.
This cleans up some #ifdef hell.

Moved the syscons options, kbd options and DEV_SPLASH to the MI options
file.

Options that go into homonymous headers shouldn't specify the header name.

Submitted by: Hiten Pandya <hiten@unixdaemons.com>

Convert the SMP_TSC kernel option into a loader tunable. Also enable
the TSC timecounter on single-CPU systems even when they are running
an SMP kernel.

Add SMP_TSC option, which can be used on SMP systems where the TSCs
are synchronized to reduce context switch cost.

Commit a partial lazy thread switch mechanism for i386. it isn't as lazy
as it could be and can do with some more cleanup. Currently its under
options LAZY_SWITCH. What this does is avoid %cr3 reloads for short
context switches that do not involve another user process. ie: we can
take an interrupt, switch to a kthread and return to the user without
explicitly flushing the tlb. However, this isn't as exciting as it could
be, the interrupt overhead is still high and too much blocks on Giant
still. There are some debug sysctls, for stats and for an on/off switch.

The main problem with doing this has been "what if the process that you're
running on exits while we're borrowing its address space?" - in this case
we use an IPI to give it a kick when we're about to reclaim the pmap.

Its not compiled in unless you add the LAZY_SWITCH option. I want to fix a
few more things and get some more feedback before turning it on by default.

This is NOT a replacement for Bosko's lazy interrupt stuff. This was more
meant for the kthread case, while his was for interrupts. Mine helps a
little for interrupts, but his helps a lot more.

The stats are enabled with options SWTCH_OPTIM_STATS - this has been a
pseudo-option for years, I just added a bunch of stuff to it.

One non-trivial change was to select a new thread before calling
cpu_switch() in the first place. This allows us to catch the silly
case of doing a cpu_switch() to the current process. This happens
uncomfortably often. This simplifies a bit of the asm code in cpu_switch
(no longer have to call choosethread() in the middle). This has been
implemented on i386 and (thanks to jake) sparc64. The others will come
soon. This is actually seperate to the lazy switch stuff.

Glanced at by: jake, jhb

- Add support for PAE and more than 4 gigs of ram on x86, dependent on the
kernel opition 'options PAE'. This will only work with device drivers which
either use busdma, or are able to handle 64 bit physical addresses.

Thanks to Lanny Baron from FreeBSD Systems for the loan of a test machine
with 6 gigs of ram.

Sponsored by: DARPA, Network Associates Laboratories, FreeBSD Systems

Nuke options HTT infavor of machdep.hlt_logical_cpus tunable/sysctl.
This keeps the logical cpu's halted in the idle loop. By default
the logical cpu's are halted at startup. It is also possible to
halt any cpu in the idle loop now using machdep.hlt_cpus.

Examples of how to use this:
machdep.hlt_cpus=1 halt cpu0
machdep.hlt_cpus=2 halt cpu1
machdep.hlt_cpus=4 halt cpu2
machdep.hlt_cpus=3 halt cpu0,cpu1

Reviewed by: jhb, peter

Wrap the hyperthreading support code with the HTT kernel option.
Hyperthreading support is now off unless the HTT option is added.

MFC-after: 3 days

Add machdep.elan_freq sysctl which can be used to set the CPU clock
frequency in Hz. The default is still 33.333 MHz. Please notice
that the number is round to a multiple of four internally so it may
not read back exactly the same as written.

Add compile time ELAN_XTAL option to override the 33.333 MHz default.

Add compile time ELAN_PPS option to enable code for high precision
(250 nanoseconds) timestamping of external signals.

Move SHOW_BUSYBUFS and PANIC_REBOOT_WAIT_TIME into the MI options file, since
MI code uses them, and every platform provides them (except x86_64 whose
options file was lacking one).

Reviewed by: bde, rwatson

Add new syscons option SC_NO_SUSPEND_VTYSWITCH.
This disables vty switch during suspend/resume.

Add a knob to turn on and off the CMPXCHG instruction on > i386 IA32 systems.
This is most beneficial for vmware client os installs.

Reviewed by: jmallet, iedowse, tlambert2@mindspring.com
MFC After: never, -STABLE does not currently use this instruction

Move the KSTACK_PAGES option from MD to MI. Although not all platforms
support this, we do have MI code that references it and is otherwise
unaware of an override. The alternative is to put knowledge in these
MI files about which platforms have the opt_kstack_pages.h option file.
It is more likely that other platforms will gain the ability to tune the
kstack size.

Automatically enable CPU_ENABLE_SSE (detect and enable SSE instructions)
if compiling with I686_CPU as a target. CPU_DISABLE_SSE will prevent
this from happening and will guarantee the code is not compiled in.

I am still not happy with this, but gcc is now generating code that uses
these instructions if you set CPUTYPE to p3/p4 or athlon-4/mp/xp or higher.

Add COMPAT_AOUT option so that config will not yell when you try and
compile it statically.

Change the support for AMDs ElanSC520 CPU from being a device driver to
be
options CPU_ELAN
(NB: Soekris.com users!)

It is cleaner this way. We still recognize the cpu on the host-pci bridge.

Move SMBFS from i386 and pc98 files and options files to MI files and
options files.

The puc(4) driver/bridge is MI, so don't bury it in MD options and files
config files. It also depends on PCI.

Make WLCACHE and WLDEBUG MI options.

Make NDGBPORTS an MI option since the dgb(4) driver is an MI driver.
Remove comments about NDGBPORTS from the options* files. Please document
options in NOTES, not in the options* files.

Revive backed out pmap related changes from Feb 2002. The highlights are:
- It actually works this time, honest!
- Fine grained TLB shootdowns for SMP on i386. IPI's are very expensive,
so try and optimize things where possible.
- Introduce ranged shootdowns that can be done as a single IPI.
- PG_G support for i386
- Specific-cpu targeted shootdowns. For example, there is no sense in
globally purging the TLB cache for where we are stealing a page from
the local unshared process on the local cpu. Use pm_active to track
this.
- Add some instrumentation for the tlb shootdown code.
- Rip out SMP code from <machine/cpufunc.h>
- Try and fix some very bogus PG_G and PG_PS interactions that were bad
enough to cause vm86 bios calls to break. vm86 depended on our existing
bugs and this was the cause of the VESA panics last time.
- Fix the silly one-line error that caused the 'panic: bad pte' last time.
- Fix a couple of other silly one-line errors that should have caused more
pain than they did.

Some more work is needed:
- pmap_{zero,copy}_page[_idle]. These can be done without IPI's if we
have a hook in cpu_switch.
- The IPI handlers need some cleanup. I have a bogus %ds load that can
be avoided.
- APTD handling is rather bogus and appears to be a large source of
global TLB IPI shootdowns for no really good reason.

I see speedups of between 1.5% and ~4% on buildworlds in a while 1 loop.
I expect to see a bigger difference when there is significant pageout
activity or the system otherwise has memory shortages.

I have backed out a few optimizations that I had been using over the last
few days in order to be a little more conservative. I'll revisit these
again over the next few days as the dust settles.

New option: DISABLE_PG_G - In case I missed something.

Make the speed used by gdb over serial settable in the kernel configuration.

This facilitates the use in circumstances where you are using a serial
console as well. GDB doesn't support anything higher than 9600 baud (19k2
if you are lucky), but the console does.

More s/file system/filesystem/g

Back out all the pmap related stuff I've touched over the last few days.
There is some unresolved badness that has been eluding me, particularly
affecting uniprocessor kernels. Turning off PG_G helped (which is a bad
sign) but didn't solve it entirely. Userland programs still crashed.

Work-in-progress commit syncing up pmap cleanups that I have been working
on for a while:
- fine grained TLB shootdown for SMP on i386
- ranged TLB shootdowns.. eg: specify a range of pages to shoot down with
a single IPI, since the IPI is very expensive. Adjust some callers
that used to trigger this inside tight loops to do a ranged shootdown
at the end instead.
- PG_G support for SMP on i386 (options ENABLE_PG_G)
- defer PG_G activation till after we decide what we are going to do with
PSE and the 4MB pages at the start of the kernel. This should solve
some rumored strangeness about stale PG_G entries getting stuck
underneath the 4MB pages.
- add some instrumentation for the fine TLB shootdown
- convert some asm instruction wrappers from functions to inlines. gcc
seems to do a fair bit better with this.
- [temporarily!] pessimize the tlb shootdown IPI handlers. I will fix
this again shortly.

This has been working fairly well for me for a while, but I have tweaked
it again prior to commit since my last major testing round. The only
outstanding problem that I know of is PG_G related, which is why there
is an option for it (not on by default for SMP). I have seen a world
speedups by a few percent (as much as 4 or 5% in one case) but I have
*not* accurately measured this - I am a bit sceptical of these numbers.

Add the puc (PCI "Universal" Communications) driver. The idea and some of
the structure definitions come from NetBSD to make it easier to share card
definitions. The driver only acts as a shim between the pci bus and the
sio driver. Later pci parallel ports could also be supported through this
driver. Support for most single and multiport pci serial cards should be
as simple as adding its definition to pucdata.c

Tested with the following pci cards:
Moxa Industio CP-114, 4 port RS-232,RS-422/485
Syba Tech Ltd. PCI-4S2P-550-ECP, 4 port RS-232 + 2 parallel ports
Netmos NM9835 PCI-2S-550, 2 port RS-232

Garbage collect options AVM_A1_PCI, AVM_A1_PCMCIA, DEBUG_LINUX, DEV_APM,
GUS_DMA, GUS_DMA2, GUS_IRQ, OLTR_NO_BULLSEYE_MAC, OLTR_NO_HAWKEYE_MAC,
OLTR_NO_TMS_MAC and PCIC_RESUME_RESET.

Add an option CPU_ATHLON_SSE_HACK which attempts to enable the SSE
feature bit on newer Athlon CPUs if the BIOS has forgotten to enable
it.

This patch was constructed using some info made available by John
Clemens at http://www.deater.net/john/PavilionN5430.html

Reviewed by: -audit
MFC after: 3 weeks

Enable polling to be configured into kernels on non i386 platforms. Note that
poll_in_trap is only implemented on i386. I've tested this on alpha.

Approved by: luigi

Move the PCI_ENABLE_IO_MODES option from conf/options.i386 to
conf/options.

Device Polling code for -current.

Non-SMP, i386-only, no polling in the idle loop at the moment.

To use this code you must compile a kernel with

options DEVICE_POLLING

and at runtime enable polling with

sysctl kern.polling.enable=1

The percentage of CPU reserved to userland can be set with

sysctl kern.polling.user_frac=NN (default is 50)

while the remainder is used by polling device drivers and netisr's.
These are the only two variables that you should need to touch. There
are a few more parameters in kern.polling but the default values
are adequate for all purposes. See the code in kern_poll.c for
more details on them.

Polling in the idle loop will be implemented shortly by introducing
a kernel thread which does the job. Until then, the amount of CPU
dedicated to polling will never exceed (100-user_frac).
The equivalent (actually, better) code for -stable is at

http://info.iet.unipi.it/~luigi/polling/

and also supports polling in the idle loop.

NOTE to Alpha developers:
There is really nothing in this code that is i386-specific.
If you move the 2 lines supporting the new option from
sys/conf/{files,options}.i386 to sys/conf/{files,options} I am
pretty sure that this should work on the Alpha as well, just that
I do not have a suitable test box to try it. If someone feels like
trying it, I would appreciate it.

NOTE to other developers:
sure some things could be done better, and as always I am open to
constructive criticism, which a few of you have already given and
I greatly appreciated.
However, before proposing radical architectural changes, please
take some time to possibly try out this code, or at the very least
read the comments in kern_poll.c, especially re. the reason why I
am using a soft netisr and cannot (I believe) replace it with a
simple timeout.

Quick description of files touched by this commit:

sys/conf/files.i386
new file kern/kern_poll.c
sys/conf/options.i386
new option
sys/i386/i386/trap.c
poll in trap (disabled by default)
sys/kern/kern_clock.c
initialization and hardclock hooks.
sys/kern/kern_intr.c
minor swi_net changes
sys/kern/kern_poll.c
the bulk of the code.
sys/net/if.h
new flag
sys/net/if_var.h
declaration for functions used in device drivers.
sys/net/netisr.h
NETISR_POLL
sys/dev/fxp/if_fxp.c
sys/dev/fxp/if_fxpvar.h
sys/pci/if_dc.c
sys/pci/if_dcreg.h
sys/pci/if_sis.c
sys/pci/if_sisreg.h
device driver modifications

GC userconfig after Peter axed it 15 months ago.

Add PCI_ENABLE_IO_MODES option, for BIOSen that neglect this.

Submitted by: Andrew R. Reiter arr@watson.org

Add a driver for the Compaq Microcom 610 ISDN (Compaq series PSB2222I) ISA PnP
card.

Submitted by: Steve Looman
Reviewed by: hm
MFC after: 1 month

Introduce new syscons(4) kernel options:
- SC_CUT_SPACES2TABS - when copying text into the cut buffer convert leading
spaces into the tabs;
- SC_CUT_SEPCHARS="XYZ" - treat supplied characters as possible words
separators when the driver searches for words boundaries when doing cut
operation.

Also unify cut code a bit to decrease amount of duplicated code. This fixes
line cut mode, so that it is no longer pads line with useless spaces.

Approved by: ru

Introduce a new option, KVA_SPACE, which can be used to reconfigure
the size of the kernel virtual address space relatively painlessly.
Userland will adapt via the exported kernbase symbol. Increasing
this causes the user part of address space to reduce.

KSE Milestone 2
Note ALL MODULES MUST BE RECOMPILED
make the kernel aware that there are smaller units of scheduling than the
process. (but only allow one thread per process at this time).
This is functionally equivalent to teh previousl -current except
that there is a thread associated with each process.

Sorry john! (your next MFC will be a doosie!)

Reviewed by: peter@freebsd.org, dillon@freebsd.org

X-MFC after: ha ha ha ha

There is no option IDE_DELAY and havn't been for a long time..

Always turned on 8bit access card support for the fe driver
both i386/pc98, so options FE_8BIT_SUPPORT was deleted.

Reviewed by: nyan

Optionize UPAGES for the i386. As part of this I split some of the low
level implementation stuff out of machine/globaldata.h to avoid exposing
UPAGES to lots more places. The end result is that we can double
the kernel stack size with 'options UPAGES=4' etc.

This is mainly being done for the benefit of a MFC to RELENG_4 at some
point. -current doesn't really need this so much since each interrupt
runs on its own kstack.

Add a cosmetic comment.

Use #ifdef DEV_SPLASH (from opt_splash.h) rather than
#if NSPLASH > 0 (from splash.h) to test the presence
of the splash driver.

Activate SSE/SIMD. This is the extra context switching support that
we are required to do if we let user processes use the extra 128 bit
registers etc.

This is the base part of the diff I got from:
http://www.issei.org/issei/FreeBSD/sse.html
I believe this is by: Mr. SUZUKI Issei <issei@issei.org>
SMP support apparently by: Takekazu KATO <kato@chino.it.okayama-u.ac.jp>
Test code by: NAKAMURA Kazushi <kaz@kobe1995.net>, see
http://kobe1995.net/~kaz/FreeBSD/SSE.en.html

I have fixed a couple of style(9) deviations. I have some followup
commits to fix a couple of non-style things.

Hints overhaul:
- Replace some very poorly thought out API hacks that should have been
fixed a long while ago.
- Provide some much more flexible search functions (resource_find_*())
- Use strings for storage instead of an outgrowth of the rather
inconvenient temporary ioconf table from config(). We already had a
fallback to using strings before malloc/vm was running anyway.

All NETSMB* options should use opt_netsmb.h file (the joy of multiple repos).

Import kernel part of SMB/CIFS requester.
Add smbfs(CIFS) filesystem.

Userland part will be in the ports tree for a while.

Obtained from: smbfs-1.3.7-dev package.

Activate USER_LDT by default. The new thread libraries are going to
depend on this. The linux ABI emulator tries to use it for some linux
binaries too. VM86 had a bigger cost than this and it was made default
a while ago.

Reviewed by: jhb, imp

change 'count eisa' to 'optional eisa' and update the only consumer
of 'NEISA' - userconfig.c.
While there, send some defunct code to the file history.

Add experimental support for Eicon.Diehl DIVA 2.0 and 2.02 ISA PnP cards.

Convert apm from a bogus 'count' into a plain option. Clean out some
other cruft from the files.alpha and files.ia64 that were related to this.

Use #ifdef DEV_NPX from opt_npx.h instead of #if NNPX > 0 from npx.h

Add PECOFF (WIN32 Execution file format) support.
To use it, some dll is needed. And currently, the dll is only for NetBSD.
So one more kernel module is needed.
For more infomation,
http://chiharu.haun.org/peace/ .

Reviewed by: bp

update to i4b version 0.95.04

Remove the NCPU, NAPIC, NBUS, NINTR config options. Make NAPIC,
NBUS, NINTR dynamic and set NCPU to a maximum of 16 under SMP.

Reviewed by: peter

Added new options CPU_PPRO2CELERON and CPU_L2_LATENCY to support
Socket 8 to 370 converters. When (1) CPU_PPRO2CELERON option is
defined, (2) Intel CPU is found and (3) CPU ID is 0x66?, L2 cache is
enabled through MSR 0x11e. The L2 cache latency value can be
specified by CPU_L2_LATENCY option. Default value of L2 cache latency
is 5.

These options are useful if you use Socket 8 to Socket 370 converter
(e.g. Power Leap's PL-Pro/II.) Most PentiumPro BIOSs don't enable L2
cache of Mendocino Celeron CPUs because they don't know Celeron CPUs.
These options are needles if you use a Coppermine (FCPGA) Celeron or
PentiumIII, becuase the L2 cache enable bit is hard wired and L2 cache
is always enabled.

Add option BROKEN_KEYBOARD_RESET to an opt_*.h file

Move UKBD_DFLT_KEYMAP into the options file since USB is machine
independent. This allows the ukbd0 driver to compile on the Alpha.

Approved by: o`brien (in principle)

Some more i386-only BIOS-friendliness:

- Add support for using the PCI BIOS functions for configuration space
accesses, and make this the default.

- Make PNPBIOS the default (obsoletes the PNPBIOS config option).

- Add two new boot-time tunables to disable each of the above.

Remove useless PCVT_FREEBSD and PCVT_EMU_MOUSE. Add PCVT_GREENSAVER.

Connect the ISA and PCI compatability shims to an option. In this case
it's options COMPAT_OLDISA and COMPAT_OLDPCI. This is meant to be a
fairly strong incentive to update the older drivers to newbus, but doesn't
(quite) leave anybody hanging with no hardware support. I was talking with
a few folks and I was encouraged to simply break or disable the shims but
that was a bit too drastic for my liking.

Port of ppbus standalone framework to the newbus system.

Note1: the correct interrupt level is invoked correctly for each driver.
For this purpose, drivers request the bus before being able to
call BUS_SETUP_INTR and BUS_TEARDOWN_INTR call is forced by the ppbus
core when drivers release it. Thus, when BUS_SETUP_INTR is called
at ppbus driver level, ppbus checks that the caller owns the
bus and stores the interrupt handler cookie (in order to unregister
it later).

Printing is impossible while plip link is up is still TRUE.
vpo (ZIP driver) and lpt are make in such a way that
using the ZIP and printing concurrently is permitted is also TRUE.

Note2: specific chipset detection is not done by default. PPC_PROBE_CHIPSET
is now needed to force chipset detection. If set, the flags 0x40
still avoid detection at boot.

Port of the pcf(4) driver to the newbus system (was previously directly
connected to the rootbus and attached by a bogus pcf_isa_probe function).

Put COMPAT_SVR4 in opt_dontuse.h for the same reasons as IBCS2 and
COMPAT_LINUX are there. It shouldn't be and isn't used after config
time, except to complicate the svr4 module makefile.

Moved options for emulators to a separate section.

- Add the device resume method. It supercedes the existing resume
routine which hooks the apm driver.
- Rename the PSM_HOOKAPM option to PSM_HOOKRESUME.
- Delete unnecessary #include.

update to isdn4bsd beta release 0.90
drivers which are likely to be ported to newbus are commented out for now

Add support for compiling SVR4 as a static module

("AND THE CROWD GOES... uh.")

Tested by: Joerg Wunsch <joerg_wunsch@interface-business.de>

- Added the following options; they have existed in syscons
for sometime, but haven't been registered here.

SC_NORM_ATTR
SC_NORM_REV_ATTR
SC_KERNEL_CONS_ATTR
SC_KERNEL_CONS_REV_ATTR

PR: kern/13176

- Added a new kernel configuration option: SC_TWOBUTTON_MOUSE.
The new option will make the right mouse button the `paste' button.
Useful for two button mice.

Submitted by: morganw@engr.sc.edu (Wes Morgan)

- Removed SC_VIDEO_DEBUG. It is broken and useless now.

Options cleanup.
* GC unused options
* Move options that exist on all architectures to conf/options
* Add missing options to LINT
* Sort undocumented options list in LINT

Reviewed by: green

Elminiate the (unused) TUNE_1542 option.

Add PNPBIOS option.

$Id$ -> $FreeBSD$

The "LINUX" option isn't actually used or referenced anywhere. The stuff
that goes to opt_dontuse.h is so an opt_*.h file doesn't get created even
though an option may be used for bringing stuff in via files[.*].

Pointed out by: bde

updating isdn4bsd to beta version 0.83

The second phase of syscons reorganization.

- Split syscons source code into manageable chunks and reorganize
some of complicated functions.

- Many static variables are moved to the softc structure.

- Added a new key function, PREV. When this key is pressed, the vty
immediately before the current vty will become foreground. Analogue
to PREV, which is usually assigned to the PrntScrn key.
PR: kern/10113
Submitted by: Christian Weisgerber <naddy@mips.rhein-neckar.de>

- Modified the kernel console input function sccngetc() so that it
handles function keys properly.

- Reorganized the screen update routine.

- VT switching code is reorganized. It now should be slightly more
robust than before.

- Added the DEVICE_RESUME function so that syscons no longer hooks the
APM resume event directly.

- New kernel configuration options: SC_NO_CUTPASTE, SC_NO_FONT_LOADING,
SC_NO_HISTORY and SC_NO_SYSMOUSE.
Various parts of syscons can be omitted so that the kernel size is
reduced.

SC_PIXEL_MODE
Made the VESA 800x600 mode an option, rather than a standard part of
syscons.

SC_DISABLE_DDBKEY
Disables the `debug' key combination.

SC_ALT_MOUSE_IMAGE
Inverse the character cell at the mouse cursor position in the text
console, rather than drawing an arrow on the screen.
Submitted by: Nick Hibma (n_hibma@FreeBSD.ORG)

SC_DFLT_FONT
makeoptions "SC_DFLT_FONT=_font_name_"
Include the named font as the default font of syscons. 16-line,
14-line and 8-line font data will be compiled in. This option replaces
the existing STD8X16FONT option, which loads 16-line font data only.

- The VGA driver is split into /sys/dev/fb/vga.c and /sys/isa/vga_isa.c.

- The video driver provides a set of ioctl commands to manipulate the
frame buffer.

- New kernel configuration option: VGA_WIDTH90
Enables 90 column modes: 90x25, 90x30, 90x43, 90x50, 90x60. These
modes are mot always supported by the video card.
PR: i386/7510
Submitted by: kbyanc@freedomnet.com and alexv@sui.gda.itesm.mx.

- The header file machine/console.h is reorganized; its contents is now
split into sys/fbio.h, sys/kbio.h (a new file) and sys/consio.h
(another new file). machine/console.h is still maintained for
compatibility reasons.

- Kernel console selection/installation routines are fixed and
slightly rebumped so that it should now be possible to switch between
the interanl kernel console (sc or vt) and a remote kernel console
(sio) again, as it was in 2.x, 3.0 and 3.1.

- Screen savers and splash screen decoders
Because of the header file reorganization described above, screen
savers and splash screen decoders are slightly modified. After this
update, /sys/modules/syscons/saver.h is no longer necessary and is
removed.

Kill option FAILSAFE.

PR: i386/12187
Approved by: bde

The FD options are now in /sys/conf/options so need to duplicate them
here and keep people from building new kernels. :)

Make vm86 a standard component

Reviewed by: silence on on -current

upgrade isdn4bsd from version 0.71 to the just released version 0.81

Move opt_sio.h options to conf/options and activate in isa/sio.c

The fd options changed during new-bus.

Shoot the LKM support in the old wd/wdc/atapi driver set in the head and
perform a cleanup/unifdef sweep over it to tidy things up. The atapi
code is permanently attached to the wd driver and is always probed.

I will add an extra option bit in the flags to disable an atapi probe on
either the master or slave if needed, if people want this.

Remember, this driver is destined to die some time. It's possible that
it will loose all atapi support down the track and only be used for
dumb non-ATA disks and all ata/atapi devices will be handled by the new
ata system.

ATAPI, ATAPI_STATIC and CMD640 are no longer options, all are implicit.

Previously discussed with: sos

Make NDGBPORTS an official option.

Keyboard driver update in preparation for the USB keyboard driver.

- Refined internal interface in keyboard drivers so that:
1. the side effect of device probe is kept minimal,
2. polling mode function is added,
3. and new ioctl and configuration options are added (see below).

- Added new ioctl: KDSETREPEAT
Set keyboard typematic rate. There has existed an ioctl command,
KDSETRAD, for the same purpose. However, KDSETRAD is dependent on
the AT keyboard. KDSETREPEAT provides more generic interface.
KDSETRAD will still be supported in the atkbd driver.

- Added new configuration options:
ATKBD_DFLT_KEYMAP
Specify a keymap to be used as the default, built-in keymap.
(There has been undocumented options, DKKEYMAP, UKKEYMAP, GRKEYMAP,
SWKEYMAP, RUKEYMAP, ESKEYMAP, and ISKEYMAP to set the default keymap.
These options are now gone for good. The new option is more general.)

KBD_DISABLE_KEYMAP_LOADING
Don't allow the user to change the keymap.

Submitted by: Larry Lile
Move the Olicom token ring driver to the officially sanctionned location of
/sys/contrib. Also fix some brokenness in the generic token ring support.

Be warned that if_dl.h has been changed and SOME programs might
like recompilation.

Make TIMER_FREQ a normal, undocumented option. Raise confusion to
a higher level with example in LINT.

Clarify comment about PPS_SYNC. Ignore for now that it doesn't
work in FLL mode, it will in a few days.

add kernel config support for i4b driver for AVM Fritz PCI

Added FE_8BIT_SUPPORT into the list. The fe driver includes opt_fe.h.

Submitted by: Takahashi Yoshihiro <nyan@dd.catv.ne.jp>

- Remove reference to obsolete options.
- Describe options for the vga driver.
Reviewed by: bde

The first stage of console driver reorganization: activate new
keyboard and video card drivers.

Because of the changes, you are required to update your kernel
configuration file now!

The files in sys/dev/syscons are still i386-specific (but less so than
before), and won't compile for alpha and PC98 yet.

syscons still directly accesses the video card registers here and
there; this will be rectified in the later stages.

Forgotten options needed to build last ppbus commit.

Submitted by: "D. Rock" <rock@wurzelausix.CS.Uni-SB.DE>

Part 1 of pcvt/voxware revival. I hope I have not clobbered any other
deltas, but it is possible since I had a few merge conflicts over the last
few days while this has been sitting ready to go.

Approved by: core

From the submitter:

CPU_WT_ALLOC does not work correctly for K6-2s of model 8+ and
probably K6-3s (when they appear on the market soon). In addition,
print_AMD_info() incorrectly printfs write allocation's size. I've
fixed them, so they now Do The Right Thing, and added a
"NO_MEMORY_HOLE" option to easily allow 15-16mb range handling for us
K6 and K6-2 users.

Submitted by: Brian Feldman <green@unixhelp.org>

Initial entry of ISDN4BSD into the FreeBSD tree.

ISDN4BSD is the work of our brand-new comitter: Hellmuth Michaelis,
who has done a tremendous amount of work to bring us this far.

There are still some outstanding issues and files to bring into
the tree, and for now it will be needed to pick up all the extra
docs from the isdn4bsd release.

It is probably also a very good idea to subscribe to the isdn@freebsd.org
mailing list before you try this out.

These files correspond to release "beta Version 0.70.00 / December
1998" from Hellmuth.

Pre 3.0 branch cleanup sos#2: sound

Superceded by the snd driver...

forgot to remote options here.

Move the "generic" SMP options from options.i386 to conf/options

Add support for the YE-Data external PCMCIA floppy driver. This
floppy is used on the toshiba Libretto line of subnotebook computers.
It differs from a normal floppy in that you must use PIO rather than
DMA to transfer the data.

To enable this, you must add options "FDC_YE" to your kernel. I don't
have a machine that has a floppy and a pcmcia slot to test to make
sure that this doesn't impact normal floppy units, so I've left this as
an option.

I have ported this to -current and made an attempt to ensure that the
indentation conforms to style(9), aka the bruce filter.

Reviewed by: nate, markm
Submitted by: David Horwitt (dhorwitt@ucsd.edu)

Obtained from: "Kenneth D. Merry" <ken@plutotech.com>

ICMP_BANDLIM option moved from i386/conf/options.i386 to generic
conf/options since it is platform indpendant.

Reviewed by: freebsd-current

Add ICMP_BANDLIM option

Make it possible to adjust the IDE probe delay from kernel config files.

Remove USERCONFIG_BOOT, add INTRO_USERCONFIG

- Implement enabling write allocate on AMD K5/K6/K6-2 cpus.
The code was originaly contributed by Kelly Yancey
<kbyanc@freedomnet.com> in PR i386/6269 and revised by Akio Morita
<amorita@meadow.scphys.kyoto-u.ac.jp> and me. Test was performed by
Akio Morita and Toshiomi Moriki <moriki@db.is.kyushu-u.ac.jp>.
- Fix stylistic bug in identcpu.c.
- Update copyright in initcpu.c
- Fix typo in LINT.

PR: 6269 and 6270

Goodbye BOUNCE_BUFFERS, for a hack it has served us well.

The last consumer of this code (the old SCSI system) has left us and
the CAM code does it's own bouncing. The isa dma system has been
doing it's own bouncing for a while too.

Reviewed by: core

SC_BAD_FLICKER -> SC_ALT_SEQACCESS
Now supposedly less harmful way of accessing VGA sequencer registers
is default. An alternative, often troublesome, I/O access is optional.

Discussed with: sos, jkh

Add VESA support to syscons.

Kazu writes:

The VESA support code requires vm86 support. Make sure your kernel
configuration file has the following line.
options "VM86"
If you want to statically link the VESA support code to the kernel,
add the following option to the kernel configuration file.
options "VESA"

The vidcontrol command now accepts the following video mode names:
VESA_132x25, VESA_132x43, VESA_132x50, VESA_132x60, VESA_800x600

The VESA_800x600 mode is a raster display mode. The 80x25 text will
be displayed on the 800x600 screen. Useful for some laptop computers.

vidcontrol accepts the new `-i <info>' option, where <info> must be
either `adapter' or `mode'. When the `-i adapter' option is given,
vidcontrol will print basic information (not much) on the video
adapter. When the `-i mode' option is specified, vidcontrol will
list video modes which are actually supported by the video adapter.

Submitted by: Kazutaka YOKOTA yokota@FreeBSD.ORG

sd->da, od is gone, no SCSI control devices.
new pass, xpt, and targ devices.

Nuke no longer used AHC options.

Make PCIC_RESUME_RESET an proper option.
My laptop (a CTX Cybernote) needs this. It claims to have a

PC-Card VLSI 82C146 (5 mem & 2 I/O windows)

- Added SC_BAD_FLICKER for syscons.
- Added the flag 0x40 (quiet bell) for syscons.

A few misc changes to get the spigot and meteor board working in 3.0.

Submitted by: Jim Lowe <james@miller.cs.uwm.edu>

Nuked opt_defunct.h and kern_opt.c. config(8) now generates good enough
warnings about all unknown options.

remove option LINUX as it did nothing, add DEBUG_LINUX to debug the
linux emulation...

(actually moved LINUX to opt_dontuse.h)

move OVERRIDE_TUNER from i386 to general options... it's not i386
specific

document options to hardwire GUS irq/dmas...

Support better performance with P6 architectures and in SMP
mode. Unnecessary TLB flushes removed. More efficient
page zeroing on P6 (modify page only if non-zero.)

Reviewed by: Amancio
Submitted by: Roger Hardiman <roger@cs.strath.ac.uk>
Roger Hardiman <roger@cs.strath.ac.uk> :
Revised autodetection code to correctly handle both
old and new VideoLogic Captivator PCI cards.
Added tsleep of 2 seconds to initialistion code for PAL users.
Corrected clock selection code on format change.

--- Amancio

Turn "PMAP_SHPGPERPROC" into a new-style option, add it to LINT, and
document it there.

Make TUNE_1542 a new-style option, and enable this option in LINT. It
has been disabled since 1994 by mistake (or at least I hope so :-)

Don't propogate *_DEBUG options. Use DEBUG and recompile
only those parts of the kernel that you are interested in.

Prodded by: Bruce Evans <bde@zeta.org.au>

Add an LPT_DEBUG option.

PR: 5773
Submitted by: Dag-Erling Coidan Smorgrav <dag-erli@ifi.uio.no>

Added SC_DISABLE_REBOOT and SC_MOUSE_CHAR.

Converted DISABLE_PSE to a new-style option.

Fixed some formatting in options.i386.

Make POWERFAIL_NMI, PPS_SYNC and NATM new style options.

This also fixes a couple of defunct options; submitted by bde.

Move DPT related options out of i386 specific files
so DPT devices can be used on other PCI (alpha?) machines.

Suggested by: several people

Add Simon Shapiro's DPT driver
this shouldn't break anything existing.
Userland utilities to follow.

Turn CLK_USE_TSC_CALIBRATION into a new-style option.

wash, sort and put in order various nits from the i586_ctr -> tsc
commit.

Pointed out by: bde

ename "i586_ctr" to "tsc" (both upper and lower case instances).
Fix a couple of printfs too.

Warning: This changes the names of a couple of kernel options!

Remove obsolete psm driver options: PSM_ACCEL, PSM_EMULATION,
PSM_CHECKSYNC.

document and make the NO_F00F_HACK a proper option...

Forgotten by: sef

Make all the documented (in pcvt(4)) options supported options. While
i was at it, do no longer insist on `PCVT_FREEBSD' being declared in
the config file, but default it to a reasonable value.

More cleanup to follow, but this part is safe for RELENG_2_2, too.

Convert the VM86 option from a global option to an option only depended
on by the files that use it. Changing the VM86 option now only causes
a recompile of a dozen files or so rather than the entire kernel.

teach sio how to attach to isa PnP cards. This is mainly for use with
internal modems. Currently detects a USR modem, and a couple Supra
modems... vendor id's for sio capabile cards welcomed...

document new option EXTRA_SIO that will increase sio's internal data
structures to support X more serial ports... these are used by the
PnP part of sio for attaching... If you don't have it specified, it
will default to 2... This is defaulted to 0 if you don't have PnP
compiled into your kernel...

also document that if you set the PnP flags (pnp x flags y) to 0x1 that
the modem will be refused to be recognized by the sio driver... this
is for people that want the traditional isa driver to probe and attach
the modem... (for keeping legacy sio numbering)

Make FDC_DEBUG a supported option.

Hide the bogus FDC ``chip type'' display behind a (mostly) undocumented
option, since people started to trust the bogus claim. Once we're going
to handle 2.88 MB controllers, we have to redo the chip detection, by
now just leave it hidden.

Add a new compile option SC_HISTORY_SIZE for syscons.

Fixed options SHOW_BUSYBUFS and PANIC_REBOOT_WAIT_TIME which were broken
by incomplete cutting and pasting from machdep.c to kern_shutdown.c.

PR: 3953

Put I*86_CPU options in opt_global.h and don't #include "opt_cpu.h"
centrally.

Add VM86 to the options.

Sanitise the Wavelan entries.
Submitted by: bde

New LINT comments and options for the Wavelan (wl) driver.
Submitted by: Jim Binkley <jrb@cs.pdx.edu>

Removed "options SMP_TIMER_NC".

Add option for compiling in a 8x16 font.

Added CPU_DIRECT_MAPPED_CACHE.

options.i386:
- Added the psm options PSM_HOOKAPM and PSM_RESETAFTERSUSPEND.

LINT:
- Added the psm options PSM_HOOKAPM and PSM_RESETAFTERSUSPEND.
- Added comments on the flag 0x20 for syscons.
- Clarified descriptions on the flags (0x02, 0x04) regarding the cursor
shape in syscons.

Preliminary support for per-cpu data pages.

This eliminates a lot of #ifdef SMP type code. Things like _curproc reside
in a data page that is unique on each cpu, eliminating the expensive macros
like: #define curproc (SMPcurproc[cpunumber()])

There are some unresolved bootstrap and address space sharing issues at
present, but Steve is waiting on this for other work. There is still some
strictly temporary code present that isn't exactly pretty.

This is part of a larger change that has run into some bumps, this part is
standalone so it should be safe. The temporary code goes away when the
full idle cpu support is finished.

Reviewed by: fsmp, dyson

Bring back CONSPEED as a last-ditch default if you can't change the speed
any other way.

Requested by: dfr

CONSPEED is defunct.

Add the 'wl' ISA Wavelan driver.
Obtained from: Jim Binkley <jrb@cs.pdx.edu>

Round 1 of a long series of commits..

Move SMP and APIC_IO from opt_smp.h to opt_global.h

Move CMD640 option from kernel Makefile into opt_wd.h

Submitted by: Wolfgang Helbig <helbig@mx.ba-stuttgart.de>

remove the SMP_INVLTLB option, making the code default for APIC_IO.

Reviewed by: informal discussion with Peter Wemm <peter@spinner.DIALix.COM>

Create a special option file "opt_global.h" which is included by all
source files via a 'cc -include opt_global.h ...' type arrangement.
This means we can untangle certain header files.

options.i386 has a placeholder until it has a real member so we can avoid
having to teach config about it just yet.

Reviewed by: bde

Man the liferafts! Here comes the long awaited SMP -> -current merge!

There are various options documented in i386/conf/LINT, there is more to
come over the next few days.

The kernel should run pretty much "as before" without the options to
activate SMP mode.

There are a handful of known "loose ends" that need to be fixed, but
have been put off since the SMP kernel is in a moderately good condition
at the moment.

This commit is the result of the tinkering and testing over the last 14
months by many people. A special thanks to Steve Passe for implementing
the APIC code!

Moved COMCONSOLE, CONADDR and CONUNIT to defunct options.

Improved CPU identification and initialization routines. This
supports All Cyrix CPUs, IBM Blue Lightning CPU and NexGen (now AMD)
Nx586 CPU, and initialize special registers of Cyrix CPU and msr of
IBM Blue Lightning CPU.

If revision of Cyrix 6x86 CPU < 2.7, CPU cache is enabled in
write-through mode. This can be disabled by kernel configuration
options.

Reviewed by: Bruce Evans <bde@freebsd.org> and
Jordan K. Hubbard <jkh@freebsd.org>

Since i don't see that anybody is implementing a more correct EISA
probing anytime soon, make EISA_SLOTS a fully supported option. It's
required for the HP NetServer LC series machines.

Next stop: make dset(8) aware of it as well.

Removed nonexistent option PSM_NO_RESET.

Back out part 1 of the MCFH that changed $Id$ to $FreeBSD$. We are not
ready for it yet.

Added KBD_MAXRETRY and PSM_NO_RESET.

Upgrade the kbdio rutines to provide queued kbd & mouse events.
Minor other updates to syscons by me.

Submitted by: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp>

Make the long-awaited change from $Id$ to $FreeBSD$

This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.

Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.

Since there have been so many reports of the Memory Mapped I/O to the
aic7xxx cards failing on certain motherboards, reverse the logic used to
control this feature. AHC_FORCE_PIO is replaced with AHC_ALLOW_MEMIO.
GENERIC no longer needs to specify the AHC_FORCE_PIO option since this is
the default.

Removed (now unused) XT_KEYBOARD option.

Replaced I586_OPTIMIZED_BCOPY and I586_OPTIMIZED_BZERO with boot-time
negative-logic flags (flags 0x01 and 0x02 for npx0, defaulting to unset = on).
This changes the default from off to on. The options have been in current
for several months with no problems reported.

Added a boot-time negative-logic flag for the old I5886_FAST_BCOPY option
which went away too soon (flag 0x04 for npx0, defaulting to unset = on).

Added a boot-time way to set the memory size (iosiz in config, iosize in
userconfig for npx0).

LINT:
Removed old options. Documented npx0's flags and iosiz.

options.i386:
Removed old options.

identcpu.c:
Don't set the function pointers here. Setting them has to be delayed
until after userconfig has had a chance to disable them and until after
a good npx0 has been detected.

machdep.c:
Use npx0's iosize instead of MAXMEM if it is nonzero.

support.s:
Added vectors and glue code for copyin() and copyout().
Fixed ifdefs for i586_bzero().
Added ifdefs for i586_bcopy().

npx.c:
Set the function pointers here.
Clear hw_float when an npx exists but is too broken to use.
Restored style from a year or three ago in npxattach().

Remove option I586_FAST_BCOPY. The code will be included by default
if I586_CPU is defined. Note there is a runtime check so the code
won't be run for non-Pentium CPUs anyway.

2.2 candidate, this code has been tested for almost half year in -current.

add in CONSPEED option

Add two new aic7xxx driver options:

AHC_FORCE_PIO - This forces the driver to use PIO even on systems that
say they have memory mapped the controller's registers. This
seems to fix Ken Lam's problems. I've also placed this option
in the GENERIC kernel file so that we are guaranteed to install
even on these flakey machines.

AHC_SHARE_SCBS - This option attempts to share the external SCB SRAM on
the 398X controllers allowing a totoll of 255 non-paged SCBs.
This doesn't work quite yet, so this option is mostly here to
help 398X owners to experiment and give me feedback until this
works properly.

Remove SC_KBD_PROBE_WORKS option and replace it with a simple run-time flag
bit (0x0008) in the sc driver configuration line. This way it's easy to
boink a generic kernel.

Also, document and place in an opt_ file the #define's for overriding which
serial port is the system console.
Approved by: sos

Improved non-statistical (GUPROF) profiling:
- use a more accurate and more efficient method of compensating for
overheads. The old method counted too much time against leaf
functions.
- normally use the Pentium timestamp counter if available.
On Pentiums, the times are now accurate to within a couple of cpu
clock cycles per function call in the (unlikely) event that there
are no cache misses in or caused by the profiling code.
- optionally use an arbitrary Pentium event counter if available.
- optionally regress to using the i8254 counter.
- scaled the i8254 counter by a factor of 128. Now the i8254 counters
overflow slightly faster than the TSC counters for a 150MHz Pentium :-)
(after about 16 seconds). This is to avoid fractional overheads.

files.i386:
permon.c temporarily has to be classified as a profiling-routine
because a couple of functions in it may be called from profiling code.

options.i386:
- I586_CTR_GUPROF is currently unused (oops).
- I586_PMC_GUPROF should be something like 0x70000 to enable (but not
use unless prof_machdep.c is changed) support for Pentium event
counters. 7 is a control mode and the counter number 0 is somewhere
in the 0000 bits (see perfmon.h for the encoding).

profile.h:
- added declarations.
- cleaned up separation of user mode declarations.

prof_machdep.c:
Mostly clock-select changes. The default clock can be changed by
editing kmem. There should be a sysctl for this.

subr_prof.c:
- added copyright.
- calibrate overheads for the new method.
- documented new method.
- fixed races and and machine dependencies in start/stop code.

mcount.c:
Use the new overhead compensation method.

gmon.h:
- changed GPROF4 counter type from unsigned to int. Oops, this should
be machine-dependent and/or int32_t.
- reorganized overhead counters.

Submitted by: Pentium event counter changes mostly by wollman

Put I*86_CPU defines in opt_cpu.h.

Added new documented options I586_OPTIMIZED_BCOPY and I586_OPTIMIZED_BZERO.

Added old misnamed option I586_FAST_BCOPY in options.i386.

Added old undocumented CLK* and SI_DEBUG options in LINT.

Multiple changes stacked as one commit since they all depend on one another.

First, change sysinstall and the Makefile rules to not build the kernel
nlist directly into sysinstall now. Instead, spit it out as an ascii
file in /stand and parse it from sysinstall later. This solves the chicken-n-
egg problem of building sysinstall into the fsimage before BOOTMFS is built
and can have its symbols extracted. Now we generate the symbol file in
release.8.

Second, add Poul-Henning's USERCONFIG_BOOT changes. These have two
effects:

1. Userconfig is always entered, rather than only after a -c
(don't scream yet, it's not as bad as it sounds).

2. Userconfig reads a message string which can optionally be
written just past the boot blocks. This string "preloads"
the userconfig input buffer and is parsed as user input.
If the first command is not "USERCONFIG", userconfig will
treat this as an implied "quit" (which is why you don't need
to scream - you never even know you went through userconfig
and back out again if you don't specifically ask for it),
otherwise it will read and execute the following commands
until a "quit" is seen or the end is reached, in which case
the normal userconfig command prompt will then be presented.

How to create your own startup sequences, using any boot.flp image
from the next snap forward (not yet, but soon):

% dd of=/dev/rfd0 seek=1 bs=512 count=1 conv=sync <<WAKKA_WAKKA_DOO
USERCONFIG
irq ed0 10
iomem ed0 0xcc000
disable ed1
quit
WAKKA_WAKKA_DOO


Third, add an intro screen to UserConfig so that users aren't just thrown
into this strange screen if userconfig is auto-launched. The default
boot.flp startup sequence is now, in fact, this:

USERCONFIG
intro
visual

(Since visual never returns, we don't need a following "quit").

Submitted-By: phk & jkh

add SC_SPLASH_SCREEN to opt_syscons.h (sigh)

Document the Adaptec driver options for tagged command queueing and SCB
paging (with a warning not to use SCB paging) and create an opt_aic7xxx.h
file for these options.

Make userconfig two (default: on) options:
USERCONFIG to enable
VISUAL_USERCONFIG to get the gui stuff too.
Requested by: pst

Removed bogus LARGMEM code and option. The code paniced when
biosextmem > 65536, but biosextmem is a 16-bit quantity so it is
guaranteed to be < 65536. Related cruft for biosbasemem was
mostly cleaned up in rev.1.26.

Fixed spelling of new SC_KBD_PROBE_WORKS option in options.i386.
It worked because it is spelled correctly in LINT.

Added old obscure syscons options MAXCONS, SLOW_VGA and XT_KEYBOARD.
This file should be sorted both alphabetically and on the module
name by using a consistent prefix for each module, but there is no
consistency in the old options. E.g., MAXCONS is spelled PCVT_NSCREENS
for pcvt.

Add ATAPI_STATIC, ATAPI, and SC_KBD_PROBE_WORKS options.

Put clock calibration #defines in opt_clock.h to ease reconfiguration

Hide options for emulators and static file systems in opt_dontuse.h.
These options only apply at config time. Using them at compile time
would break the corresponding lkms.

Removed nonexistent option "LINUX" (what's that :-).

Removed options MAXCONS & HARDFONT, they are no longer in use
(and havn't been for long, sigh)

Fixed `PCVT_FREEBSD=210'.

Moved AUTO_EOI_[12] and most sio and pcvt options out of the makefile.

Add support for Pentium and Pentium Pro performance counters.
(This code is as yet untested; to come after man page is written.)
This also adds inlines to cpufunc.h for the RDTSC, RDMSR, WRMSR, and RDPMC
instructions. The user-mode interface is via a subdevice of mem.c;
there is also a kernel-size interface which might be used to aid
profiling.

Delete recognition for COMPAT_LINUX - it's *gone* now.. :-)

Mega-commit for Linux emulator update.. This has been stress tested under
netscape-2.0 for Linux running all the Java stuff. The scrollbars are now
working, at least on my machine. (whew! :-)

I'm uncomfortable with the size of this commit, but it's too
inter-dependant to easily seperate out.

The main changes:

COMPAT_LINUX is *GONE*. Most of the code has been moved out of the i386
machine dependent section into the linux emulator itself. The int 0x80
syscall code was almost identical to the lcall 7,0 code and a minor tweak
allows them to both be used with the same C code. All kernels can now
just modload the lkm and it'll DTRT without having to rebuild the kernel
first. Like IBCS2, you can statically compile it in with "options LINUX".

A pile of new syscalls implemented, including getdents(), llseek(),
readv(), writev(), msync(), personality(). The Linux-ELF libraries want
to use some of these.

linux_select() now obeys Linux semantics, ie: returns the time remaining
of the timeout value rather than leaving it the original value.

Quite a few bugs removed, including incorrect arguments being used in
syscalls.. eg: mixups between passing the sigset as an int, vs passing
it as a pointer and doing a copyin(), missing return values, unhandled
cases, SIOC* ioctls, etc.

The build for the code has changed. i386/conf/files now knows how
to build linux_genassym and generate linux_assym.h on the fly.

Supporting changes elsewhere in the kernel:

The user-mode signal trampoline has moved from the U area to immediately
below the top of the stack (below PS_STRINGS). This allows the different
binary emulations to have their own signal trampoline code (which gets rid
of the hardwired syscall 103 (sigreturn on BSD, syslog on Linux)) and so
that the emulator can provide the exact "struct sigcontext *" argument to
the program's signal handlers.

The sigstack's "ss_flags" now uses SS_DISABLE and SS_ONSTACK flags, which
have the same values as the re-used SA_DISABLE and SA_ONSTACK which are
intended for sigaction only. This enables the support of a SA_RESETHAND
flag to sigaction to implement the gross SYSV and Linux SA_ONESHOT signal
semantics where the signal handler is reset when it's triggered.

makesyscalls.sh no longer appends the struct sysentvec on the end of the
generated init_sysent.c code. It's a lot saner to have it in a seperate
file rather than trying to update the structure inside the awk script. :-)

At exec time, the dozen bytes or so of signal trampoline code are copied
to the top of the user's stack, rather than obtaining the trampoline code
the old way by getting a clone of the parent's user area. This allows
Linux and native binaries to freely exec each other without getting
trampolines mixed up.

Add more options into the conf/options and i386/conf/options.i386 files
and the #include hooks so that 'make depend' is more useful. This
covers most of the options I regularly use (but not all) and some other
easy ones.

Choose a different name to hold the option definition.. The original one
was overlapping with another file, and making some undesirable behavior a
little worse - it's triggering a bug in config that appears to have been
there for some time (before the options files, anyway.)

Convert BOUNCE_BUFFERS and BOUNCEPAGES to new option scheme.

convert the math emulation to use the new-style options.

Converted two options over to the new scheme: USER_LDT and KTRACE.