Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFC 261781:
Don't waste a page of KVA for the boot-time memory test on x86. For amd64,
reuse the first page of the crashdumpmap as CMAP1/CADDR1. For i386,
remove CMAP1/CADDR1 entirely and reuse CMAP3/CADDR3 for the memory test.

MFC r258135: x86: Allow users to change PSL_RF via ptrace(PT_SETREGS...)

Debuggers may need to change PSL_RF. Note that tf_eflags is already stored
in the signal context during signal handling and PSL_RF previously could
be modified via sigreturn, so this change should not provide any new
ability to userspace.

For background see the thread at:
http://lists.freebsd.org/pipermail/freebsd-i386/2007-September/005910.html

Reviewed by: jhb, kib

Sponsored by: DARPA, AFRL
Approved by: re (gjb)

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

MFi386: r254619

Reimplement atomic_load_acq_64() and atomic_store_rel_64() for i386.

Noticed by: tinderbox

Replace kernel virtual address space allocation with vmem. This provides
transparent layering and better fragmentation.

- Normalize functions that allocate memory to use kmem_*
- Those that allocate address space are named kva_*
- Those that operate on maps are named kmap_*
- Implement recursive allocation handling for kmem_arena in vmem.

Reviewed by: alc
Tested by: pho
Sponsored by: EMC / Isilon Storage Division

MFi386: revision 251039

Use slightly more idiomatic expression to get the address of array.

- Correct mispellings of word resource

Submitted by: Christoph Mallon <christoph.mallon@gmx.de>

Switch the vm_object mutex to be a rwlock. This will enable in the
future further optimizations where the vm_object lock will be held
in read mode most of the time the page cache resident pool of pages
are accessed for reading purposes.

The change is mostly mechanical but few notes are reported:
* The KPI changes as follow:
- VM_OBJECT_LOCK() -> VM_OBJECT_WLOCK()
- VM_OBJECT_TRYLOCK() -> VM_OBJECT_TRYWLOCK()
- VM_OBJECT_UNLOCK() -> VM_OBJECT_WUNLOCK()
- VM_OBJECT_LOCK_ASSERT(MA_OWNED) -> VM_OBJECT_ASSERT_WLOCKED()
(in order to avoid visibility of implementation details)
- The read-mode operations are added:
VM_OBJECT_RLOCK(), VM_OBJECT_TRYRLOCK(), VM_OBJECT_RUNLOCK(),
VM_OBJECT_ASSERT_RLOCKED(), VM_OBJECT_ASSERT_LOCKED()
* The vm/vm_pager.h namespace pollution avoidance (forcing requiring
sys/mutex.h in consumers directly to cater its inlining functions
using VM_OBJECT_LOCK()) imposes that all the vm/vm_pager.h
consumers now must include also sys/rwlock.h.
* zfs requires a quite convoluted fix to include FreeBSD rwlocks into
the compat layer because the name clash between FreeBSD and solaris
versions must be avoided.
At this purpose zfs redefines the vm_object locking functions
directly, isolating the FreeBSD components in specific compat stubs.

The KPI results heavilly broken by this commit. Thirdy part ports must
be updated accordingly (I can think off-hand of VirtualBox, for example).

Sponsored by: EMC / Isilon storage division
Reviewed by: jeff
Reviewed by: pjd (ZFS specific review)
Discussed with: alc
Tested by: pho

MFcalloutng:
When CPU becomes idle, cpu_idleclock() calculates time to the next timer
event in order to reprogram hw timer. Return that time in sbintime_t to
the caller and pass it to acpi_cpu_idle(), where it can be used as one
more factor (quite precise) to extimate furter sleep time and choose
optimal sleep state. This is a preparatory change for further callout
improvements will be committed in the next days.

The commmit is not targeted for MFC.

Reduce diffs against i386.

Fix some KASSERTs.
They are missing changes from r208833, r227394 and r227442.

MFi386: r211924

Register an interrupt vector for DTrace return probes.

The 'testing memory' patch gets printed too many times

Approved by: cperciva (implicit)

Explain the upcoming delay by printing a message when the kernel
is about to begin testing memory.

Reviewed by: dteske, adri
Approved by: cperciva
MFC after: 1 week

Reverts r234074,234105,234564,234723,234989,235231-235232 and part of
r234247.
Use, instead, the static intializer introduced in r239923 for x86 and
sparc64 intr_cpus, unwinding the code to the initial version.

Reviewed by: marius

MFi386: revision 237445

Commit changes missed from r237435. Properly calculate the signal
trampoline addresses after the shared page is enabled. Handle FreeBSD
ABIs without shared page support too.

MFi386: revision 238792

Introduce curpcb magic variable.

Partially revert r217515 so that the mem_range_softc variable is always
present on x86 kernels. This fixes the build of kernels that include
'device acpi' but do not include 'device mem'.

MFC after: 1 month

Add SMP/i386 suspend/resume support.
Most part is merged from amd64.

- i386/acpica/acpi_wakecode.S
Replaced with amd64 code (from realmode to paging enabling code).

- i386/acpica/acpi_wakeup.c
Replaced with amd64 code (except for wakeup_pagetables stuff).

- i386/include/pcb.h
- i386/i386/genassym.c
Added PCB new members (CR0, CR2, CR4, DS, ED, FS, SS, GDT, IDT, LDT
and TR) needed for suspend/resume, not for context switch.

- i386/i386/swtch.s
Added suspendctx() and resumectx().
Note that savectx() was not changed and used for suspending (while
amd64 code uses it).
BSP and AP execute the same sequence, suspendctx(), acpi_wakecode()
and resumectx() for suspend/resume (in case of UP system also).

- i386/i386/apic_vector.s
Added cpususpend().

- i386/i386/mp_machdep.c
- i386/include/smp.h
Added cpususpend_handler().

- i386/include/apicvar.h
- kern/subr_smp.c
- sys/smp.h
Added IPI_SUSPEND and suspend_cpus().

- i386/i386/initcpu.c
- i386/i386/machdep.c
- i386/include/md_var.h
- pc98/pc98/machdep.c
Moved initializecpu() declarations to md_var.h.

MFC after: 3 days

Clean up the intr* MD KPI from the SMP dependency, removing a cause of
discrepancy between modules and kernel, but deal with SMP differences
within the functions themselves.

As an added bonus this also helps in terms of code readability.

Requested by: gibbs
Reviewed by: jhb, marius
MFC after: 1 week

MFi386: revisions 234074 and 234105

- Adding the BSP as an interrupt target directly in cpu_startup().

- Fix to build a native i386 kernel without the SMP and atpic.
- Merge r232744 changes to pc98.
(Allow a kernel to be built with 'nodevice atpic'.)
- Move ICU related defines from x86/isa/atpic.c to x86/isa/icu.h and
use them in x86/x86/intr_machdep.c.

Reviewed by: jhb

Add support for the extended FPU states on amd64, both for native
64bit and 32bit ABIs. As a side-effect, it enables AVX on capable
CPUs.

In particular:

- Query the CPU support for XSAVE, list of the supported extensions
and the required size of FPU save area. The hw.use_xsave tunable is
provided for disabling XSAVE, and hw.xsave_mask may be used to
select the enabled extensions.

- Remove the FPU save area from PCB and dynamically allocate the
(run-time sized) user save area on the top of the kernel stack,
right above the PCB. Reorganize the thread0 PCB initialization to
postpone it after BSP is queried for save area size.

- The dumppcb, stoppcbs and susppcbs now do not carry the FPU state as
well. FPU state is only useful for suspend, where it is saved in
dynamically allocated suspfpusave area.

- Use XSAVE and XRSTOR to save/restore FPU state, if supported and
enabled.

- Define new mcontext_t flag _MC_HASFPXSTATE, indicating that
mcontext_t has a valid pointer to out-of-struct extended FPU
state. Signal handlers are supplied with stack-allocated fpu
state. The sigreturn(2) and setcontext(2) syscall honour the flag,
allowing the signal handlers to inspect and manipilate extended
state in the interrupted context.

- The getcontext(2) never returns extended state, since there is no
place in the fixed-sized mcontext_t to place variable-sized save
area. And, since mcontext_t is embedded into ucontext_t, makes it
impossible to fix in a reasonable way. Instead of extending
getcontext(2) syscall, provide a sysarch(2) facility to query
extended FPU state.

- Add ptrace(2) support for getting and setting extended state; while
there, implement missed PT_I386_{GET,SET}XMMREGS for 32bit binaries.

- Change fpu_kern KPI to not expose struct fpu_kern_ctx layout to
consumers, making it opaque. Internally, struct fpu_kern_ctx now
contains a space for the extended state. Convert in-kernel consumers
of fpu_kern KPI both on i386 and amd64.

First version of the support for AVX was submitted by Tim Bird
<tim.bird am sony com> on behalf of Sony. This version was written
from scratch.

Tested by: pho (previous version), Yamagi Burmeister <lists yamagi org>
MFC after: 1 month

Move the scsi_da_bios_params() prototype from pc98_machdep.h to md_var.h
where the prototype for pc98_ata_disk_firmware_geom_adjust() also lives
in order to avoid an #ifdef'ed include in cam(4).

MFi386: revision 225936

Add some improvements in the idle table callbacks:
- Replace instances of manual assembly instruction "hlt" call
with halt() function calling.
- In cpu_idle_mwait() avoid races in check to sched_runnable() using
the same pattern used in cpu_idle_hlt() with the 'hlt' instruction.
- Add comments explaining the logic behind the pattern used in
cpu_idle_hlt() and other idle callbacks.

In order to maximize the re-usability of kernel code in user space this
patch modifies makesyscalls.sh to prefix all of the non-compatibility
calls (e.g. not linux_, freebsd32_) with sys_ and updates the kernel
entry points and all places in the code that use them. It also
fixes an additional name space collision between the kernel function
psignal and the libc function of the same name by renaming the kernel
psignal kern_psignal(). By introducing this change now we will ease future
MFCs that change syscalls.

Reviewed by: rwatson
Approved by: re (bz)

In HEAD when doing no further checkes there is no reason use the
temporary variable and check with if as TUNABLE_*_FETCH do not
alter values unless successfully found the tunable.

Reported by: jhb, bde
MFC after: 3 days
X-MFC with: r224516
Approved by: re (kib)

Introduce a tunable to disable the time consuming parts of bootup
memtesting, which can easily save seconds to minutes of boot time.
The tunable name is kept general to allow reusing the code in
alternate frameworks.

Requested by: many
Discussed on: arch (a while a go)
Obtained from: Sandvine Incorporated
Reviewed by: sbruno
Approved by: re (kib)
MFC after: 2 weeks

remove code for dynamic offlining/onlining of CPUs on x86

The code has definitely been broken for SCHED_ULE, which is a default
scheduler. It may have been broken for SCHED_4BSD in more subtle ways,
e.g. with manually configured CPU affinities and for interrupt devilery
purposes.
We still provide a way to disable individual CPUs or all hyperthreading
"twin" CPUs before SMP startup. See the UPDATING entry for details.

Interaction between building CPU topology and disabling CPUs still
remains fuzzy: topology is first built using all availble CPUs and then
the disabled CPUs should be "subtracted" from it. That doesn't work
well if the resulting topology becomes non-uniform.

This work is done in cooperation with Attilio Rao who in addition to
reviewing also provided parts of code.

PR: kern/145385
Discussed with: gcooper, ambrisko, mdf, sbruno
Reviewed by: attilio
Tested by: pho, pluknet
X-MFC after: never

Reinstate cpu_est_clockrate() support for P-state invariant TSC if APERF and
MPERF MSRs are available. It was disabled in r216443. Remove the earlier
hack to subtract 0.5% from the calibrated frequency as DELAY(9) is little
bit more reliable now.

Use atomic load & store for TSC frequency. It may be overkill for amd64 but
safer for i386 because it can be easily over 4 GHz now. More worse, it can
be easily changed by user with 'machdep.tsc_freq' tunable (directly) or
cpufreq(4) (indirectly). Note it is intentionally not used in performance
critical paths to avoid performance regression (but we should, in theory).
Alternatively, we may add "virtual TSC" with lower frequency if maximum
frequency overflows 32 bits (and ignore possible incoherency as we do now).

Implement atomic_load_acq_64(9) and atomic_store_rel_64(9) for i386. These
functions are implemented with CMPXCHG8B instruction where it is available,
i. e., all Pentium-class and later processors. Note this instruction is
also used for atomic_store_rel_64() because a simple XCHG-like instruction
for 64-bit memory access does not exist, unfortunately. If the processor
lacks the instruction, i. e., 80486-class CPUs, two 32-bit load/store are
performed with interrupt temporarily disabled, assuming it does not support
SMP. Although this assumption may be little naive, it is true in reality.
This implementation is inspired by Linux.

Deprecate tsc_present as the last of its real consumers finally disappeared.

Add a tunable "machdep.disable_tsc" to turn off TSC. Specifically, it turns
off boot-time CPU frequency calibration, DELAY(9) with TSC, and using TSC as
a CPU ticker. Note tsc_present does not change by this tunable.

Deprecate rarely used tsc_is_broken. Instead, we zero out tsc_freq because
it is almost always used with tsc_freq any way.

MFi386: revision 218744

To avoid excessive code duplication create wrapper for fill regs
from stack frame.

MFi386: revision 218329

Fix linking of the kernel without device npx.

MFi386: revision 218327

Clear the padding when returning context to the usermode, for
MI ucontext_t and x86 MD parts.
Kernel allocates the structures on the stack, and not clearing
reserved fields and paddings causes leakage.

MFi386: revision 217886

Set td_kstack_pages for thread0.

Make MSGBUF_SIZE kernel option a loader tunable kern.msgbufsize.

Submitted by: perryh pluto.rain.com (previous version)
Reviewed by: jhb
Approved by: kib (mentor)
Tested by: universe

MFi386: revision 217515

The mem_range_softc is defined in mem.c.

MFi386 r216012 by kib:

Calling fill_fpregs() for curthread is legitimate, and ELF coredump
does this.

Discussed with: kib
MFC after: 3 days

Do not subtract 0.5% from estimated frequency if DELAY(9) is driven by TSC.
Remove a confusing comment about converting to MHz as we never did.

Remove npxgetregs(), npxsetregs(), fpugetregs() and fpusetregs()
functions, they are unused. Remove 'user' from npxgetuserregs()
etc. names.

For {npx,fpu}{get,set}regs(), always use pcb->pcb_user_save for FPU
context storage. This eliminates the need for ugly copying with
overwrite of the newly added and reserved fields in ucontext on i386
to satisfy alignment requirements for fpusave() and fpurstor().

pc98 version was copied from i386.

Suggested and reviewed by: bde
Tested by: pho (i386 and amd64)
MFC after: 1 week

Adjust the order of operations in spinlock_enter() and spinlock_exit() to
work properly with single-stepping in a kernel debugger. Specifically,
these routines have always disabled interrupts before increasing the nesting
count and restored the prior state of interrupts after decreasing the nesting
count to avoid problems with a nested interrupt not disabling interrupts
when acquiring a spin lock. However, trap interrupts for single-stepping
can still occur even when interrupts are disabled. Now the saved state of
interrupts is not saved in the thread until after interrupts have been
disabled and the nesting count has been increased. Similarly, the saved
state from the thread cannot be read once the nesting count has been
decreased to zero. To fix this, use temporary variables to store interrupt
state and shuffle it between the thread's MD area and the appropriate
registers.

In cooperation with: bde
MFC after: 1 month

Move the <machine/mca.h> header to <x86/mca.h>.

Rename BUS_SPACE_IO and BUS_SPACE_MEM defines to BUS_SPACE_TAG_IO and
BUS_SPACE_TAG_MEM respectively to avoid conflict with nexus.c.

MFi386: the part of revision 213226.

Rewrite the i386 memory probe:
- Move the base memory setup into a new basemem_setup() routine.

MFC after: 1 week

Remove trailing ", " from `sysctl machdep.idle_available' output.

Refactor timer management code with priority to one-shot operation mode.
The main goal of this is to generate timer interrupts only when there is
some work to do. When CPU is busy interrupts are generating at full rate
of hz + stathz to fullfill scheduler and timekeeping requirements. But
when CPU is idle, only minimum set of interrupts (down to 8 interrupts per
second per CPU now), needed to handle scheduled callouts is executed.
This allows significantly increase idle CPU sleep time, increasing effect
of static power-saving technologies. Also it should reduce host CPU load
on virtualized systems, when guest system is idle.

There is set of tunables, also available as writable sysctls, allowing to
control wanted event timer subsystem behavior:
kern.eventtimer.timer - allows to choose event timer hardware to use.
On x86 there is up to 4 different kinds of timers. Depending on whether
chosen timer is per-CPU, behavior of other options slightly differs.
kern.eventtimer.periodic - allows to choose periodic and one-shot
operation mode. In periodic mode, current timer hardware taken as the only
source of time for time events. This mode is quite alike to previous kernel
behavior. One-shot mode instead uses currently selected time counter
hardware to schedule all needed events one by one and program timer to
generate interrupt exactly in specified time. Default value depends of
chosen timer capabilities, but one-shot mode is preferred, until other is
forced by user or hardware.
kern.eventtimer.singlemul - in periodic mode specifies how much times
higher timer frequency should be, to not strictly alias hardclock() and
statclock() events. Default values are 2 and 4, but could be reduced to 1
if extra interrupts are unwanted.
kern.eventtimer.idletick - makes each CPU to receive every timer interrupt
independently of whether they busy or not. By default this options is
disabled. If chosen timer is per-CPU and runs in periodic mode, this option
has no effect - all interrupts are generating.

As soon as this patch modifies cpu_idle() on some platforms, I have also
refactored one on x86. Now it makes use of MONITOR/MWAIT instrunctions
(if supported) under high sleep/wakeup rate, as fast alternative to other
methods. It allows SMP scheduler to wake up sleeping CPUs much faster
without using IPI, significantly increasing performance on some highly
task-switching loads.

Tested by: many (on i386, amd64, sparc64 and powerc)
H/W donated by: Gheorghe Ardelean
Sponsored by: iXsystems, Inc.

bus_add_child: change type of order parameter to u_int

This reflects actual type used to store and compare child device orders.
Change is mostly done via a Coccinelle (soon to be devel/coccinelle)
semantic patch.
Verified by LINT+modules kernel builds.

Followup to: r212213
MFC after: 10 days

Store fsbase and gsbase in the right fields of the mcontext. They were
switched.

PR: i386/148344
Approved by: kib (mentor)
MFC after: 1 week

Move prototypes for kern_sigtimedwait() and kern_sigprocmask() to
<sys/syscallsubr.h> where all other kern_<syscall> prototypes live.

Fix bugs on pc98, use npxgetuserregs() instead of npxgetregs() for
get_fpcontext(), and npxsetuserregs() for set_fpcontext). Also,
note that usercontext is not initialized anymore in fpstate_drop().

Systematically replace references to npxgetregs() and npxsetregs()
by npxgetuserregs() and npxsetuserregs() in comments.

Noted by: bde

After the FPU use requires #MF working due to INT13 FPU exception handling
removal, MFi386 r209198:
Use critical sections instead of disabling local interrupts to ensure
the consistency between PCPU fpcurthread and the state of FPU.

Reviewed by: bde
Tested by: pho

Introduce the x86 kernel interfaces to allow kernel code to use
FPU/SSE hardware. Caller should provide a save area that is chained
into the stack of the areas; pcb save_area for usermode FPU state is
on top. The pcb now contains a pointer to the current FPU saved area,
used during FPUDNA handling and context switches. There is also a
facility to allow the kernel thread to use pcb save_area.

Change the dreaded warnings "npxdna in kernel mode!" into the panics
when FPU usage is not registered.

KPI discussed with: fabient
Tested by: pho, fabient
Hardware provided by: Sentex Communications
MFC after: 1 month

MFi386: the part of revision 181809

Use SEL_KPL macro.

MFi386: revision 178471

- Add an integer argument to idle to indicate how likely we are to wake
from idle over the next tick.
- Add a new MD routine, cpu_wake_idle() to wakeup idle threads who are
suspended in cpu specific states. This function can fail and cause the
scheduler to fall back to another mechanism (ipi).
- Implement support for mwait in cpu_idle() on i386/amd64 machines that
support it. mwait is a higher performance way to synchronize cpus
as compared to hlt & ipis.
- Allow selecting the idle routine by name via sysctl machdep.idle. This
replaces machdep.cpu_idle_hlt. Only idle routines supported by the
current machine are permitted.

Reduce diffs against i386.

MFi386: revision 208621

Defer initializing machine checks for the boot CPU until the local APIC is
fully configured.

MFi386: revision 208604

Clarify a potential issue in get_fpcontext() use.

Change ad_firmware_geom_adjust() to operate on a struct disk * only and
hook it up to ada(4) also. While at it, rename *ad_firmware_geom_adjust()
to *ata_disk_firmware_geom_adjust() etc now that these are no longer
limited to ad(4).

Reviewed by: mav
MFC after: 3 days

MFi386: revision 206553

- Change printf() calls to uprintf() for sigreturn().
- Normalize the messages to include both pid and thread name.

Change the arguments of exec_setregs() so that it receives a pointer
to the image_params struct instead of several members of that struct
individually. This makes it easier to expand its arguments in the future
without touching all platforms.

Reviewed by: jhb

Introduce the new kernel sub-tree x86 which should contain all the code
shared and generalized between our current amd64, i386 and pc98.

This is just an initial step that should lead to a more complete effort.
For the moment, a very simple porting of cpufreq modules, BIOS calls and
the whole MD specific ISA bus part is added to the sub-tree but ideally
a lot of code might be added and more shared support should grow.

Sponsored by: Sandvine Incorporated
Reviewed by: emaste, kib, jhb, imp
Discussed on: arch
MFC: 3 weeks

In r197963, a race with thread being selected for signal delivery
while in kernel mode, and later changing signal mask to block the
signal, was fixed for sigprocmask(2) and ptread_exit(3). The same race
exists for sigreturn(2), setcontext(2) and swapcontext(2) syscalls.

Use kern_sigprocmask() instead of direct manipulation of td_sigmask to
reschedule newly blocked signals, closing the race.

Reviewed by: davidxu
Tested by: pho
MFC after: 1 month

Implement a facility for dynamic per-cpu variables.
- Modules and kernel code alike may use DPCPU_DEFINE(),
DPCPU_GET(), DPCPU_SET(), etc. akin to the statically defined
PCPU_*. Requires only one extra instruction more than PCPU_* and is
virtually the same as __thread for builtin and much faster for shared
objects. DPCPU variables can be initialized when defined.
- Modules are supported by relocating the module's per-cpu linker set
over space reserved in the kernel. Modules may fail to load if there
is insufficient space available.
- Track space available for modules with a one-off extent allocator.
Free may block for memory to allocate space for an extent.

Reviewed by: jhb, rwatson, kan, sam, grehan, marius, marcel, stas

Add cpu_flush_dcache() for use after non-DMA based I/O so that a
possible future I-cache coherency operation can succeed. On ARM
for example the L1 cache can be (is) virtually mapped, which
means that any I/O that uses temporary mappings will not see the
I-cache made coherent. On ia64 a similar behaviour has been
observed. By flushing the D-cache, execution of binaries backed
by md(4) and/or NFS work reliably.
For Book-E (powerpc), execution over NFS exhibits SIGILL once in
a while as well, though cpu_flush_dcache() hasn't been implemented
yet.

Doing an explicit D-cache flush as part of the non-DMA based I/O
read operation eliminates the need to do it as part of the
I-cache coherency operation itself and as such avoids pessimizing
the DMA-based I/O read operations for which D-cache are already
flushed/invalidated. It also allows future optimizations whereby
the bcopy() followed by the D-cache flush can be integrated in a
single operation, which could be implemented using on-chips DMA
engines, by-passing the D-cache altogether.

MFi386: revision 192050

Implement simple machine check support.

MFi386: revision 190919

Simplify in/out functions.

Remove a hack to generate more efficient code for port numbers below
0x100, which has been obsolete for at least ten years, because GCC has
an asm constraint to specify that.

MFi386: revision 190617

Fill the fsbase and gsbase fields of the mcontext structure on i386.

MFi386: r190447

Convert gdt_segs and ldt_segs initialization to C99 style.

MFi386: 189423

A better fix for handling different FPU initial control words for different
ABIs.

Improved IDE HDD geometry adjustment. Previous code didn't work with
certain ATA-6 drives including CF cards.

The IDE geometry of the PC98 is calculated from the drive capacity.
In addition to the algorithm in NEC BIOS, a variety of algorithms are
provided by 3'rd party boards and BIOS hacks. This change has
implemented the three algorithms: IDE BIOS compatible mode, SCSI BIOS
compatible mode and same way as the previous version. The tunable
machdep.ad_geom_method selects the algorithm.

I have been using this change for a year with CF cards.

Reminded by: nyan

- Add the i386_memio_map_load() function to load I/O address table.
- Add the bus_space_compare macro for bus_space consistency.
- Switch using the bus_space_map_load() in isa_load_resourcev().

Add i386_memio_compare() to compare two resources.
It's used by uart(4) in the future.

- Add an integer argument to idle to indicate how likely we are to wake
from idle over the next tick.
- Add a new MD routine, cpu_wake_idle() to wakeup idle threads who are
suspended in cpu specific states. This function can fail and cause the
scheduler to fall back to another mechanism (ipi).
- Implement support for mwait in cpu_idle() on i386/amd64 machines that
support it. mwait is a higher performance way to synchronize cpus
as compared to hlt & ipis.
- Allow selecting the idle routine by name via sysctl machdep.idle. This
replaces machdep.cpu_idle_hlt. Only idle routines supported by the
current machine are permitted.

Sponsored by: Nokia

Now that all platforms use genclock, shuffle things around slightly
for better structure.

Much of this is related to <sys/clock.h>, which should really have
been called <sys/calendar.h>, but unless and until we need the name,
the repocopy can wait.

In general the kernel does not know about minutes, hours, days,
timezones, daylight savings time, leap-years and such. All that
is theoretically a matter for userland only.

Parts of kernel code does however care: badly designed filesystems
store timestamps in local time and RTC chips almost universally
track time in a YY-MM-DD HH:MM:SS format, and sometimes in local
timezone instead of UTC. For this we have <sys/clock.h>

<sys/time.h> on the other hand, deals with time_t, timeval, timespec
and so on. These know only seconds and fractions thereof.

Move inittodr() and resettodr() prototypes to <sys/time.h>.
Retain the names as it is one of the few surviving PDP/VAX references.

Move startrtclock() to <machine/clock.h> on relevant platforms, it
is a MD call between machdep.c/clock.c. Remove references to it
elsewhere.

Remove a lot of unnecessary <sys/clock.h> includes.

Move the machdep.disable_rtc_set sysctl to subr_rtc.c where it belongs.
XXX: should be kern.disable_rtc_set really, it's not MD.

In keeping with style(9)'s recommendations on macros, use a ';'
after each SYSINIT() macro invocation. This makes a number of
lightweight C parsers much happier with the FreeBSD kernel
source, including cflow's prcc and lxr.

MFC after: 1 month
Discussed with: imp, rink

Since version 4.3, gcc changed its behaviour concerning the i386/amd64
ABI and the direction flag, that is it now assumes that the direction
flag is cleared at the entry of a function and it doesn't clear once
more if needed. This new behaviour conforms to the i386/amd64 ABI.

Modify the signal handler frame setup code to clear the DF {e,r}flags
bit on the amd64/i386 for the signal handlers.

jhb@ noted that it might break old apps if they assumed DF == 1 would be
preserved in the signal handlers, but that such apps should be rare and
that older versions of gcc would not generate such apps.

Submitted by: Aurelien Jarno <aurelien aurel32 net>
PR: 121422
Reviewed by: jhb
MFC after: 2 weeks

Remove kernel support for M:N threading.

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.

MFi386: revision 1.658

Add "show sysregs" command to ddb. On i386, this gives gdt, idt, ldt,
cr0-4, etc. Support should be added for other platforms that have a
different set of registers for system use.

Add a new 'why' argument to kdb_enter(), and a set of constants to use
for that argument. This will allow DDB to detect the broad category of
reason why the debugger has been entered, which it can use for the
purposes of deciding which DDB script to run.

Assign approximate why values to all current consumers of the
kdb_enter() interface.

MFi386: revision 1.661

Drastically simplify the i386 pcpu backend by merging parts of the
amd64 mechanism over.

Fix for the panic("vm_thread_new: kstack allocation failed") and
silent NULL pointer dereference in the i386 and sparc64 pmap_pinit()
when the kmem_alloc_nofault() failed to allocate address space. Both
functions now return error instead of panicing or dereferencing NULL.

As consequence, vmspace_exec() and vmspace_unshare() returns the errno
int. struct vmspace arg was added to vm_forkproc() to avoid dealing
with failed allocation when most of the fork1() job is already done.

The kernel stack for the thread is now set up in the thread_alloc(),
that itself may return NULL. Also, allocation of the first process
thread is performed in the fork1() to properly deal with stack
allocation failure. proc_linkup() is separated into proc_linkup()
called from fork1(), and proc_linkup0(), that is used to set up the
kernel process (was known as swapper).

In collaboration with: Peter Holm
Reviewed by: jhb

MFi386: revision 1.657

Backout experimental adaptive-spin umtx code.

MFi386: revision 1.656

Add the machine-specific definitions for configuring the new physical
memory allocator.

Set the size of phys_avail[] and dump_avail[] using one of these
definitions.

Commit 14/14 of sched_lock decomposition.
- Use thread_lock() rather than sched_lock for per-thread scheduling
sychronization.
- Use the per-process spinlock rather than the sched_lock for per-process
scheduling synchronization.

Tested by: kris, current@
Tested on: i386, amd64, ULE, 4BSD, libthr, libkse, PREEMPTION, etc.
Discussed with: kris, attilio, kmacy, jhb, julian, bde (small parts each)

Revert VMCNT_* operations introduction.
Probabilly, a general approach is not the better solution here, so we should
solve the sched_lock protection problems separately.

Requested by: alc
Approved by: jeff (mentor)

MFi386: revision 1.653.

MFi386: revision 1.652

- Move GDT/LDT locking into a seperate spinlock, removing the global
scheduler lock from this responsibility.

- define and use VMCNT_{GET,SET,ADD,SUB,PTR} macros for manipulating
vmcnts. This can be used to abstract away pcpu details but also changes
to use atomics for all counters now. This means sched lock is no longer
responsible for protecting counts in the switch routines.

Contributed by: Attilio Rao <attilio@FreeBSD.org>

MFi386: revision 1.650

Eliminate an unused parameter.

MFi386: revision 1.647.

exclude the icu and clock lock from LOCK_PROFILING

Oops, pc98 is independent of i386 for clock.c and machdep.c but not
for clock.h, so changing th i386 clock.h broke it. MFi386 (not tested):

Cleaned up declaration and initialization of clock_lock. It is only
used by clock code, so don't export it to the world for machdep.c to
initialize. There is a minor problem initializing it before it is
used, since although clock initialization is split up so that parts
of it can be done early, the first part was never done early enough
to actually work. Split it up a bit more and do the first part as
late as possible to document the necessary order. The functions that
implement the split are still bogusly exported.

Cleaned up initialization of the i8254 clock hardware using the new
split. Actually initialize it early enough, and don't work around it
not being initialized in DELAY() when DELAY() is called early for
initialization of some console drivers.

This unfortunately moves a little more code before the early debugger
breakpoint so that it is harder to debug. The ordering of console and
related initialization is delicate because we want to do as little as
possible before the breakpoint, but must initialize a console.

MFi386: revision 1.646.

Allow machdep.cpu_idle_hlt to be set from the loader. This should allow
to workaround the problem with SMP kernels on Turion64 X2 processors
described in kern/104678 and may be useful in other situations too.

MFC after: 3 days

Threading cleanup.. part 2 of several.

Make part of John Birrell's KSE patch permanent..
Specifically, remove:
Any reference of the ksegrp structure. This feature was
never fully utilised and made things overly complicated.
All code in the scheduler that tried to make threaded programs
fair to unthreaded programs. Libpthread processes will already
do this to some extent and libthr processes already disable it.

Also:
Since this makes such a big change to the scheduler(s), take the opportunity
to rename some structures and elements that had to be moved anyhow.
This makes the code a lot more readable.

The ULE scheduler compiles again but I have no idea if it works.

The 4bsd scheduler still reqires a little cleaning and some functions that now do
ALMOST nothing will go away, but I thought I'd do that as a separate commit.

Tested by David Xu, and Dan Eischen using libthr and libpthread.

MFi386: revisions from 1.641 to 1.643.

MFi386: revisions 1.634 and 1.639.

Make KSE a kernel option, turned on by default in all GENERIC
kernel configs except sun4v (which doesn't process signals properly
with KSE).

Reviewed by: davidxu@

Second part of a little cleanup in the calendar/timezone/RTC handling.

Split subr_clock.c in two parts (by repo-copy):
subr_clock.c contains generic RTC and calendaric stuff. etc.
subr_rtc.c contains the newbus'ified RTC interface.

Centralize the machdep.{adjkerntz,disable_rtc_set,wall_cmos_clock}
sysctls and associated variables into subr_clock.c. They are
not machine dependent and we have generic code that relies on being
present so they are not even optional.

First part of a little cleanup in the calendar/timezone/RTC handling.

Move relevant variables to <sys/clock.h> and fix #includes as necessary.

Use libkern's much more time- & spamce-efficient BCD routines.

Remove the no longer relevant or correct bootinfo sysctls.

Add pc98 specific code to adjust the firmware geometry when it differs
from the actual geometry. This enables support of disks larger than
~120GB on pc98 boxes. They make great little network appliances.
I've been using these changes for the past year or so on my network
storage pc98 box :-).

Simplify the pager support in DDB. Allowing different db commands to
install custom pager functions didn't actually happen in practice (they
all just used the simple pager and passed in a local quit pointer). So,
just hardcode the simple pager as the only pager and make it set a global
db_pager_quit flag that db commands can check when the user hits 'q' (or a
suitable variant) at the pager prompt. Also, now that it's easy to do so,
enable paging by default for all ddb commands. Any command that wishes to
honor the quit flag can do so by checking db_pager_quit. Note that the
pager can also be effectively disabled by setting $lines to 0.

Other fixes:
- 'show idt' on i386 and pc98 now actually checks the quit flag and
terminates early.
- 'show intr' now actually checks the quit flag and terminates early.

MFi386: revisions 1.627, 1.628 and 1.629.

Since DELAY() was moved, most <machine/clock.h> #includes have been
unnecessary.

Clean out sysctl machdep.* related defines.

The cmos clock related stuff should really be in MI code.

Remove unneeded include.

- Move defines for PC-98 machine type from pc98/cbus/cbus.h into
pc98/pc98/pc98_machdep.h.
- Fix PC98_SYSTEM_PARAMETER_SIZE.
- Remove unused defines.

MFi386: revision 1.625.

Don't allow userland to set hardware watch points on kernel memory at all.
Previously, we tried to allow this only for root. However, we were calling
suser() on the *target* process rather than the current process. This
means that if you can ptrace() a process running as root you can set a
hardware watch point in the kernel. In practice I think you probably have
to be root in order to pass the p_candebug() checks in ptrace() to attach
to a process running as root anyway. Rather than fix the suser(), I just
axed the entire idea, as I can't think of any good reason _at all_ for
userland to set hardware watch points for KVM.

MFC after: 3 days
Also thinks hardware watch points on KVM from userland are bad: bde, rwatson

MFi386: revision 1.622.

> Clear carry flag in get_mcontext so that setcontext does not
> return a bogus error.

MFC after: 3 days

MFi386: revision 1.621

Add missing "struct" in i386/i386/machdep.c,v 1.497 by deischen@.

Reduce diffs from i386/i386/machdep.c

Merge over the remaining changes from i386 of the ksiginfo_t changes so
that this compiles.

Pointy hat to: davidxu

1. Change prototype of trapsignal and sendsig to use ksiginfo_t *, most
changes in MD code are trivial, before this change, trapsignal and
sendsig use discrete parameters, now they uses member fields of
ksiginfo_t structure. For sendsig, this change allows us to pass
POSIX realtime signal value to user code.

2. Remove cpu_thread_siginfo, it is no longer needed because we now always
generate ksiginfo_t data and feed it to libpthread.

3. Add p_sigqueue to proc structure to hold shared signals which were
blocked by all threads in the proc.

4. Add td_sigqueue to thread structure to hold all signals delivered to
thread.

5. i386 and amd64 now return POSIX standard si_code, other arches will
be fixed.

6. In this sigqueue implementation, pending signal set is kept as before,
an extra siginfo list holds additional siginfo_t data for signals.
kernel code uses psignal() still behavior as before, it won't be failed
even under memory pressure, only exception is when deleting a signal,
we should call sigqueue_delete to remove signal from sigqueue but
not SIGDELSET. Current there is no kernel code will deliver a signal
with additional data, so kernel should be as stable as before,
a ksiginfo can carry more information, for example, allow signal to
be delivered but throw away siginfo data if memory is not enough.
SIGKILL and SIGSTOP have fast path in sigqueue_add, because they can
not be caught or masked.
The sigqueue() syscall allows user code to queue a signal to target
process, if resource is unavailable, EAGAIN will be returned as
specification said.
Just before thread exits, signal queue memory will be freed by
sigqueue_flush.
Current, all signals are allowed to be queued, not only realtime signals.

Earlier patch reviewed by: jhb, deischen
Tested on: i386, amd64

Add some defines for EPSON machines and use them.

Remove EPSON PC-386 note A/W/AE/WR support.

Remove unused functions.

MFi386: revision 1.617.

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)

MFi386: revision 1.615 (change kernel crashdump format to ELF).

Approved by: re (scottl)

MFi386: revision 1.614.

Change a directory layout for pc98.
- Move MD files into <arch>/<arch>.
- Move bus dependent files into <arch>/<bus>.
Rename some files to more suitable names.

Repo-copied by: peter
Discussed with: imp

MFi386: revision 1.612.

- Remove ifdef PC98.
- Reduce diffs from i386.

Divorce critical sections from spinlocks. Critical sections as denoted by
critical_enter() and critical_exit() are now solely a mechanism for
deferring kernel preemptions. They no longer have any affect on
interrupts. This means that standalone critical sections are now very
cheap as they are simply unlocked integer increments and decrements for the
common case.

Spin mutexes now use a separate KPI implemented in MD code: spinlock_enter()
and spinlock_exit(). This KPI is responsible for providing whatever MD
guarantees are needed to ensure that a thread holding a spin lock won't
be preempted by any other code that will try to lock the same lock. For
now all archs continue to block interrupts in a "spinlock section" as they
did formerly in all critical sections. Note that I've also taken this
opportunity to push a few things into MD code rather than MI. For example,
critical_fork_exit() no longer exists. Instead, MD code ensures that new
threads have the correct state when they are created. Also, we no longer
try to fixup the idlethreads for APs in MI code. Instead, each arch sets
the initial curthread and adjusts the state of the idle thread it borrows
in order to perform the initial context switch.

This change is largely a big NOP, but the cleaner separation it provides
will allow for more efficient alternative locking schemes in other parts
of the kernel (bare critical sections rather than per-CPU spin mutexes
for per-CPU data for example).

Reviewed by: grehan, cognet, arch@, others
Tested on: i386, alpha, sparc64, powerpc, arm, possibly more

bus is unused, so eliminate it.
Minor style(9) tweaks

Merge from i386:
- Add a i8254_pending variable to save some indirections in clkintr().
- Don't bother setting up an IRQ0 handler if we are using the lapic timer.

s/SLIST/STAILQ/

Define IRQ_NPX for the irq used for the npx. Define macro for a full
reset of of npx, as appropriate for the platform.

MFi386: revision 1.217.

- Remove the BURN_BRIDGES marked support for hooking into the ISA timer 0
interrupt.
- Remove the timer_func variable as it now has a static value of
hardclock() and is only used in one place.

Axe borrowed from: phk

MFi386: revisions 1.609 and 1.610.

Don't use the ptoa() to set the 'realmem' variable. Because F/pc98's policy
is to keep the same as F/i386.

Attempt to doff the pointy hat: implement 'hw.realmem' on remaining
architectures. Pointed out by O'Brien, ScottL via email.

Reviewed by: obrien (various)

Use dynamic major number allocation.

Fix to support Buffalo HYPERMEMORY.

Submitted by: Chiharu Shibata
MFC after: 3 days

Merged from sys/dev/sio/sio.c revision 1.458.

Fix pc98 compile: merge in changes to use the local APIC timer. Also, add
missing initialization of i8254_intsrc while I am here.

Remove unused defines.

Add missing isa_dmatc() function.

This may or may not be correct, Only the pcii driver would notice and
it doesn't support PC98 yet.

Sort includes and remove duplicate include.

MFi386: revision 1.606.

Finish the job of sorting all includes and fix the build by including
malloc.h before proc.h on sparc64. Noticed by das@

Compiled on: alpha, amd64, i386, pc98, sparc64

Merged from sys/dev/sio/sio.c revision 1.457.

MFi386: revision 1.605.

In my last commit, I'd assumed that LINE30 was always defined. It
turns out that LINE30_ROW was always defined, not LINE30. I confused
this for LINE30 and did the unifdef -DLINE30 using that mistaken
belief. This corrects that problem.

Submitted by: nyan-san

LINE30 is always defined now, so unifdef -DLINE30 for clarity.

Merge module.h into 30line.h and remove it. It lacked a
copyright/license header and was only used by 30line.h. It appears
that the copyright/license in 30line.h covers the old contents
module.h anyway, so this simplifies things a little while cleaning up
one obscure potential license confusion...

Revired by: nyan-san

/* -> /*- for license, minor formatting changes

Remove last vestiges of old wd driver. ata works well on pc98 and
there was no objection on the pc98 list when I asked if it could be
removed a while ago.

Fix comment.

Separate mse driver into a core driver and a bus attachments. Separate out
the ISA and CBUS (called isa on pc98) attachments. Eliminate all PC98
ifdefs in the process (the driver in pc98/pc98/mse.c was a copy of the one
in i386/isa/mse.c with PC98 ifdefs). Create a module for this driver.

I've tested this my PC-9821RaS40 with moused. I've not tested this on i386
because I have no InPort cards, or similar such things. NEC standardized
on bus mice very early, long before ps/2 mice ports apeared, so all PC-98
machines supported by FreeBSD/pc98 have bus mice, I believe.

Reviewed by: nyan-san

Don't include sys/user.h merely for its side-effect of recursively
including other headers.

U areas are going away, so don't allocate one for process 0.

Reviewed by: arch@

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

Add FL_MFM flag to the fd_native_types structure.

Submitted by: Watanabe Kazuhiro <CQG00620@nifty.ne.jp>

- Change the ddb paging "support" to use a variable (db_lines_per_page) to
control the number of lines per page rather than a constant. The variable
can be examined and changed in ddb as '$lines'. Setting the variable to
0 will effectively turn off paging.
- Change db_putchar() to force out pending whitespace before outputting
newlines and carriage returns so that one can rub out content on the
current line via '\r \r' type strings.
- Change the simple pager to rub out the --More-- prompt explicitly when
the routine exits.
- Add some aliases to the simple pager to make it more compatible with
more(1): 'e' and 'j' do a single line. 'd' does half a page, and
'f' does a full page.

MFC after: 1 month
Inspired by: kris

MFi386: revision 1.599 (Preserve dcons(4) buffer passed by loader(8).)

Don't set si_bsize_phys.

Use bioq_takefirst()

use bioq_takefirst()

Use bioq_takefirst()

Merged from sys/dev/sio/sio.c (Use generic tty code).

Remove unused variable.

Remove local hacks to set flags now that the device probe does this for us.
Tested on every device except sio_pci and the pc98 fd.c. Perhaps something
similar should be done for the "disabled" hints also.

MFC after: 2 weeks

Use generic tty code instead of local stuff.

NB: device names are now consistent: {cua,tty}d$(port)[.lock,.init]

Add more PnP serial cards support.

PR: kern/72226
Submitted by: Hirokazu WATANABE <wnabe@par.odn.ne.jp>

Merged from sys/dev/sio/sio.c: more tty related changes.

Use tty->t_sc, ttyalloc() and lock/init termios from struct tty.

Include <sys/malloc.h> to satisfy new isa_dma stuff.

Add new a function isa_dma_init() which returns an errno when it fails
and which takes a M_WAITOK/M_NOWAIT flag argument.

Add compatibility isa_dmainit() macro which whines loudly if
isa_dma_init() fails.

Problem uncovered by: tegge

Refactor a bunch of scheduler code to give basically the same behaviour
but with slightly cleaned up interfaces.

The KSE structure has become the same as the "per thread scheduler
private data" structure. In order to not make the diffs too great
one is #defined as the other at this time.

The KSE (or td_sched) structure is now allocated per thread and has no
allocation code of its own.

Concurrency for a KSEGRP is now kept track of via a simple pair of counters
rather than using KSE structures as tokens.

Since the KSE structure is different in each scheduler, kern_switch.c
is now included at the end of each scheduler. Nothing outside the
scheduler knows the contents of the KSE (aka td_sched) structure.

The fields in the ksegrp structure that are to do with the scheduler's
queueing mechanisms are now moved to the kg_sched structure.
(per ksegrp scheduler private data structure). In other words how the
scheduler queues and keeps track of threads is no-one's business except
the scheduler's. This should allow people to write experimental
schedulers with completely different internal structuring.

A scheduler call sched_set_concurrency(kg, N) has been added that
notifies teh scheduler that no more than N threads from that ksegrp
should be allowed to be on concurrently scheduled. This is also
used to enforce 'fainess' at this time so that a ksegrp with
10000 threads can not swamp a the run queue and force out a process
with 1 thread, since the current code will not set the concurrency above
NCPU, and both schedulers will not allow more than that many
onto the system run queue at a time. Each scheduler should eventualy develop
their own methods to do this now that they are effectively separated.

Rejig libthr's kernel interface to follow the same code paths as
linkse for scope system threads. This has slightly hurt libthr's performance
but I will work to recover as much of it as I can.

Thread exit code has been cleaned up greatly.
exit and exec code now transitions a process back to
'standard non-threaded mode' before taking the next step.
Reviewed by: scottl, peter
MFC after: 1 week

Kill count device support from config. I've changed the last few
remaining consumers to have the count passed as an option. This is
i4b, pc98/wdc, and coda.

Bump configvers.h from 500013 to 600000.

Remove heuristics that tried to parse "device ed5" as 5 units of the ed
device. This broke things like the snd_emu10k1 device, which required
quotes to make it parse right. The no-longer-needed quotes have been
removed from NOTES, GENERIC etc. eg, I've removed the quotes from:
device snd_maestro
device "snd_maestro3"
device snd_mss

I believe everything will still compile and work after this.

Remove the HW_WDOG option; it serves no purpose.

MFC after: 3 days

Merged from sys/dev/fdc/fdc.c revision 1.283.

MFi386: revision 1.597.

Merged from sys/dev/sio/sio.c revision 1.450.

MFi386: revision 1.596.

Merged from the following changes.
- sys/dev/fdc/fdc.c revision 1.281
- sys/dev/fdc/fdcvar.h revision 1.3
- sys/dev/fdc/fdc_isa.c revision 1.7

Preparation commit for the tty cleanups that will follow in the near
future:

rename ttyopen() -> tty_open() and ttyclose() -> tty_close().

We need the ttyopen() and ttyclose() for the new generic cdevsw
functions for tty devices in order to have consistent naming.

Move the fdc_alloc_resources function into the bus front end.

Merged from recent fdc driver changes.
Make a separate function to check FDD type.

MFi386: revision 1.213.
Fix miss merging in previous change.

Add ptrace_clear_single_step(), alpha already has it for years, the function
will be used by ptrace to clear a thread's single step state.

Introduce ttygone() which indicates that the hardware is detached.

Move dtrwait logic to the generic TTY level.

MFi386: revision 1.212.

MFi386: Update for the KDB framework:
o Implement makectx().
o Call kdb_enter() instead of Debugger().
o Remove implementation of Debugger().

Update for the KDB framework. Sanitize the alpha console code now that
it's in the way even more. Basicly: remove all alpha specific console
support from gfb(4), sio(4) and syscons(4). Rewrite the alpha console
initialization to be identical to all other platforms. In a nutshell:
call cninit().
The platform specific code now only sets or clears RB_SERIAL and thus
automaticly causes the right console to be selected.

sio.c:
o Replace the remote GDB hacks and use the GDB debug port interface
instead.
o Make debugging code conditional upon KDB instead of DDB.
o Call kdb_alt_break() instead of db_alt_break().
o Call kdb_enter() instead of breakpoint().
o Remove the ugly compatibility of using the console as the debug
port.

- Merged from sys/dev/fdc/fdc.c revision 1.275.
- Break out the cbus front end from fd.c.
- Remove the pccard support because it was broken.

MFi386: revision 1.16.

Remove obsolete defines.

Merged from sys/dev/sio/sio.c revision 1.446.

- Shorten the names for the TTY related swi interrupt handlers as the
'tty:' prefix is largely redundant.
- Fix the priority of the low-priority TTY SWIs that are hung off of the
softclock thread.

Submitted by: bde (2)

Merged from sys/dev/sio/sio.c revision 1.444.

Pick the hotchar out of the tty structure instead of caching private
copies.

No current line disciplines have a dynamically changing hotchar, and
expecting to receive anything sensible during a change in ldisc is
insane so no locking of the hotchar field is necessary.

Merged from sys/dev/sio/sio.c revision 1.442.
(Use generic support for modemcontrol and BREAK ioctls.)

Remove the TIOCDCDTIMESTAMP option.

The RFC-2783 PPS-API (<sys/timepps.h>) provides better and more
configurable service.

Merged from sys/dev/sio/sio.c revisions 1.439 and 1.440.

MFi386: revision 1.592.

Do the dreaded s/dev_t/struct cdev */
Bump __FreeBSD_version accordingly.

Include vm/vm_param.h to pull in KERNBASE now. This should fix the
pc98 tinderbox breakage.

Deorbit COMPAT_SUNOS.

We inherited this from the sparc32 port of BSD4.4-Lite1. We have neither
a sparc32 port nor a SunOS4.x compatibility desire these days.

Remove atdevbase and replace it's remaining uses with direct references to
KERNBASE instead.

Add missing <sys/module.h> includes.

Centralize the line discipline optimization determination in a function
called ttyldoptim().

Use this function from all the relevant drivers.

I belive no drivers finger linesw[] directly anymore, paving the way for
locking and refcounting.

Manual edits to change linesw[]-frobbing to ttyld_*() calls.

Machine generated patch which changes linedisc calls from accessing
linesw[] directly to using the ttyld...() functions

The ttyld...() functions ar inline so there is no performance hit.

Add missing <sys/module.h> #includes

Make the remaining serial drivers call ttyioctl() rather than calling
the linedisc directly.

Add missing <sys/module.h> includes currently relying on nested include
in <sys/kernel.h>

There is no need to explicitly call the stop function. In all likelyhood
->l_close() did it and ttyclose certainly will.

There is no need to explicitly call ttwakeup() and ttwwakeup() after
ttyclose() has been called. It's already been done once by ttyclose,
and probably once by the line-discipline too.

ttyclose() increments t_gen. Remove redundant increments in drivers.

Merged from sys/dev/fdc/fdc.c revision 1.272.

Mereged from sys/dev/sio/sio.c revision 1.429.

- Remove obsolete examples.
- Add a comment about meaning of flags.
- Disable unused defines.

Merged from sys/dev/sio/sio.c revision 1.428.

Merged from sys/isa/fd.c revision 1.270.

Remove advertising clause from University of California Regent's
license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson

Add a comment about time stamper.

Submitted by: chi@bd.mbn.or.jp (Chiharu Shibata)

- Fix PC98 supports after importing auto selection. [1]
- Fix 1.44MB floppy drive probe sequence. [2]

Submitted by: Watanabe Kazuhiro <CQG00620@nifty.ne.jp> [1]
chi@bd.mbn.or.jp (Chiharu Shibata) [2]

MFi386: revision 1.586.

Convert callers to the new bus_alloc_resource_any(9) API.

Submitted by: Mark Santcroos <marks@ripe.net>
Reviewed by: imp, dfr, bde

including isa_device.h was historical in this file, remove it

Restore CDIOCREADAUDIO ioctl.

Pointed out by: KIYOHARA Takashi <kiyohara@kk.iij4u.or.jp>

Remove '#include <machine/bus_pio.h>'. This is meaningless.

Remove unused FDNUMTOUNIT() macro

Merged from sys/isa/fd.c revision 1.266.

Device megapatch 4/6:

Introduce d_version field in struct cdevsw, this must always be
initialized to D_VERSION.

Flip sense of D_NOGIANT flag to D_NEEDGIANT, this involves removing
four D_NOGIANT flags and adding 145 D_NEEDGIANT flags.

Device megapatch 3/6:

Add missing D_TTY flags to various drivers.

Complete asserts that dev_t's passed to ttyread(), ttywrite(),
ttypoll() and ttykqwrite() have (d_flags & D_TTY) and a struct tty
pointer.

Make ttyread(), ttywrite(), ttypoll() and ttykqwrite() the default
cdevsw methods for D_TTY drivers and remove the explicit initializations
in various drivers cdevsw structures.

Device megapatch 1/6:

Free approx 86 major numbers with a mostly automatically generated patch.

A number of strategic drivers have been left behind by caution, and a few
because they still (ab)use their major number.

Change the disk(9) API in order to make device removal more robust.

Previously the "struct disk" were owned by the device driver and this
gave us problems when the device disappared and the users of that device
were not immediately disappearing.

Now the struct disk is allocate with a new call, disk_alloc() and owned
by geom_disk and just abandonned by the device driver when disk_create()
is called.

Unfortunately, this results in a ton of "s/\./->/" changes to device
drivers.

Since I'm doing the sweep anyway, a couple of other API improvements
have been carried out at the same time:

The Giant awareness flag has been flipped from DISKFLAG_NOGIANT to
DISKFLAG_NEEDSGIANT

A version number have been added to disk_create() so that we can detect,
report and ignore binary drivers with old ABI in the future.

Manual page update to follow shortly.

Merged from sys/dev/sio/sio.c revision 1.418.

MFi386: revision 1.583.

Make sigaltstack as per-threaded, because per-process sigaltstack state
is useless for threaded programs, multiple threads can not share same
stack.
The alternative signal stack is private for thread, no lock is needed,
the orignal P_ALTSTACK is now moved into td_pflags and renamed to
TDP_ALTSTACK.
For single thread or Linux clone() based threaded program, there is no
semantic changed, because those programs only have one kernel thread
in every process.

Reviewed by: deischen, dfr

Add detach method.

Merged from sys/dev/sio/sio.c revision 1.417.

Merged from sys/dev/sio/sio.c revisions 1.415 and 1.416.

Approved by: nyan
(Blanket approval for simple changes in sio.)

opt_apic.h is not needed.

Change the clear_ret argument of get_mcontext() to be a flags argument.
Since all callers either passed 0 or 1 for clear_ret, define bit 0 in
the flags for use as clear_ret. Reserve bits 1, 2 and 3 for use by MI
code for possible (but unlikely) future use. The remaining bits are for
use by MD code.

This change is triggered by a need on ia64 to have another knob for
get_mcontext().

- Implement selwakeuppri() which allows raising the priority of a
thread being waken up. The thread waken up can run at a priority as
high as after tsleep().

- Replace selwakeup()s with selwakeuppri()s and pass appropriate
priorities.

- Add cv_broadcastpri() which raises the priority of the broadcast
threads. Used by selwakeuppri() if collision occurs.

Not objected in: -arch, -current

Include machine/asmacros.h instead of machine/asm.h.

Submitted by: bde

MFi386: revision 1.206

MFi386: revision 1.580

Split pc98 support into pc98/pc98/nmi.c.

MFi386: revision 1.579.

Merged from sys/isa/syscons_isa.c revision 1.24.

MFi386: revision 1.578.

MFi386: revision 1.577.

Eliminate use bio_blkno.

Discontinue bio_blkno usage.

MFi386: revision 1.576.

Merged from sys/dev/sio/sio.c revisions from 1.405 to 1.414.

MFi386: revisions 1.572, 1.573 and 1.574.

MFi386: revision 1.205

OK, I messed up /dev/console with what I had hoped would be compat
code. Convert remaining console drivers and hope for the best.

Typo in last commit: missing ')'

Change fb_attach() and fb_detach() to take a integer unit number rather
than a dev_t.

All of the dev_t's passed were bogusly created with makedev()

Implement the bus_space_map() function to allocate resources and initialize
a bus_handle, but currently it does only initializing a bus_handle.

Merged from sys/isa/fd.c revisions 1.259 and 1.260.

Merged from sys/isa/fd.c revision 1.258.

MFi386 revisions 1.570 and 1.571.

MFi386: revision 1.204.

Merged from sys/isa/fd.c revisions 1.252, 1.253, 1.254, 1.255 and 1.257.

Merged from sys/dev/sio/sio.c revisions 1.403 and 1.404.

Switch to dev/syscons/syscons.c.

MFi386: revisions 1.202 and 1.203.

bandaide to make this build again

As warned: Initiate deorbit burn for the pcaudio driver.

MFi386: revision 1.201.

Merged from sys/dev/sio/sio.c revision 1.400.

Merged from sys/dev/ppc/ppc.c revision 1.42.

Cosmetic: fix disorder of opt_kstack_pages.h include.

Supported the gdc_clear function.

Submitted by: chi@bd.mbn.or.jp (Chiharu Shibata)

Rename thread_siginfo to cpu_thread_siginfo.

Suggested by: jhb

Fixed mouse cursor support.

Submitted by: KIYOHARA Takashi <kiyohara@kk.iij4u.or.jp>

- Use the new resource_disabled() helper function to see if devices are
disabled.
- Change the apm driver to match the acpi driver's behavior by checking to
see if the device is disabled in the identify routine instead of in the
probe routine. This way if the device is disabled it is never created.

Note that a few places (ips(4), Alpha SMP) used "disable" instead of
"disabled" for their hint names, and these hints must be changed to
"disabled". If this is a big problem, resource_disabled() can always be
changed to honor both names.

MFi386: revision 1.566.

Add a machine depended function thread_siginfo, SA signal code
will use the function to construct a siginfo structure and use
the result to export to userland.

Reviewed by: julian

Replace evil abuse of geteblk() with malloc(9).

Fixed compile error.

MFi386: revision 1.199

Merged from sys/isa/ppc.c revision 1.40.

Merged from sys/isa/fd.c revision 1.250.

Merged from sys/dev/sio/sio.c revision 1.399.

Fix a typo that broke the pc98 kernel build.

Reported by: des@'s tinderbox
Pointy hat to: jhb
Approved by: re (blanket/scottl)

- Merge struct procsig with struct sigacts.
- Move struct sigacts out of the u-area and malloc() it using the
M_SUBPROC malloc bucket.
- Add a small sigacts_*() API for managing sigacts structures: sigacts_alloc(),
sigacts_free(), sigacts_copy(), sigacts_share(), and sigacts_shared().
- Remove the p_sigignore, p_sigacts, and p_sigcatch macros.
- Add a mutex to struct sigacts that protects all the members of the struct.
- Add sigacts locking.
- Remove Giant from nosys(), kill(), killpg(), and kern_sigaction() now
that sigacts is locked.
- Several in-kernel functions such as psignal(), tdsignal(), trapsignal(),
and thread_stopped() are now MP safe.

Reviewed by: arch@
Approved by: re (rwatson)

Deprecate machine/limits.h in favor of new sys/limits.h.
Change all in-tree consumers to include <sys/limits.h>

Discussed on: standards@
Partially submitted by: Craig Rodrigues <rodrigc@attbi.com>

Add an argument to get_mcontext() which specified whether the
syscall return values should be cleared. The system calls
getcontext() and swapcontext() want to return 0 on success
but these contexts can be switched to at a later time so
the return values need to be cleared in the saved register
sets. Other callers of get_mcontext() would normally want
the context without clearing the return values.

Remove the i386-specific context saving from the KSE code.
get_mcontext() is not i386-specific any more.

Fix a bad pointer in the alpha get_mcontext() code. The
context was being bcopy()'d from &td->tf_frame, but tf_frame
is itself a pointer, so the thread was being copied instead.
Spotted by jake.

Glanced at by: jake
Reviewed by: bde (months ago)

Hold the proc lock for curproc around sigonstack().

Don't include <sys/disklabel.h>

MFi386: revision 1.561

Don't use dkmakeminor(), it has nothing to do with CDroms.

MFi386: revisions 1.556 and 1.557.
Backout revision 1.312.

Merged from sys/dev/syscons/syscons.c revision 1.400.

Use bioq_flush() to drain a bio queue with a specific error code.
Retain the mistake of not updating the devstat API for now.

Spell bioq_disksort() consistently with the remaining bioq_*().

#include <geom/geom_disk.h> where this is more appropriate.

- Define a new md function 'casuptr'. This atomically compares and sets
a pointer that is in user space. It will be used as the basic primitive
for a kernel supported user space lock implementation.
- Implement this function in x86's support.s
- Provide stubs that return -1 in all other architectures. Implementations
will follow along shortly.

Reviewed by: jake

- Move p->p_sigmask to td->td_sigmask. Signal masks will be per thread with
a follow on commit to kern_sig.c
- signotify() now operates on a thread since unmasked pending signals are
stored in the thread.
- PS_NEEDSIGCHK moves to TDF_NEEDSIGCHK.

- Change trapsignal() to accept a thread and not a proc.
- Change all consumers to pass in a thread.

Right now this does not cause any functional changes but it will be important
later when signals can be delivered to specific threads.

- Add vm_paddr_t, a physical address type. This is required for systems
where physical addresses larger than virtual addresses, such as i386s
with PAE.
- Use this to represent physical addresses in the MI vm system and in the
i386 pmap code. This also changes the paddr parameter to d_mmap_t.
- Fix printf formats to handle physical addresses >4G in the i386 memory
detection code, and due to kvtop returning vm_paddr_t instead of u_long.

Note that this is a name change only; vm_paddr_t is still the same as
vm_offset_t on all currently supported platforms.

Sponsored by: DARPA, Network Associates Laboratories
Discussed with: re, phk (cdevsw change)

Retire sys/pc98/pc98/spkr.c

PC98 systems don't need to worry about the MCA bus.

Including <sys/stdint.h> is (almost?) universally only to be able to use
%j in printfs, so put a newsted include in <sys/systm.h> where the printf
prototype lives and save everybody else the trouble.

Fix malloc() without legal mode flag.

Call devstat_start_transaction_bio() instead of devstat_start_transaction()

Merged from sys/dev/syscons/syscons.c revision 1.396.

Merged from sys/dev/sio/sio.c revisions 1.387 and 1.388.

Allocate the devstat structure with devstat_new_entry().

Centralize the devstat handling for all GEOM disk device drivers
in geom_disk.c.

As a side effect this makes a lot of #include <sys/devicestat.h>
lines not needed and some biofinish() calls can be reduced to
biodone() again.

Make nokqfilter() return the correct return value.

Ditch the D_KQFILTER flag which was used to prevent calling NULL pointers.

Gigacommit to improve device-driver source compatibility between
branches:

Initialize struct cdevsw using C99 sparse initializtion and remove
all initializations to default values.

This patch is automatically generated and has been tested by compiling
LINT with all the fields in struct cdevsw in reverse order on alpha,
sparc64 and i386.

Approved by: re(scottl)

More low-hanging fruit: kill caddr_t in calls to wakeup(9) / [mt]sleep(9).

NO_GEOM cleanup:

Convert to "struct disk *" centric API.

Convert one more d_mmap_t consumer I missed in my previous commit.

Cleanup of the d_mmap_t interface.

- Get rid of the useless atop() / pmap_phys_address() detour. The
device mmap handlers must now give back the physical address
without atop()'ing it.
- Don't borrow the physical address of the mapping in the returned
int. Now we properly pass a vm_offset_t * and expect it to be
filled by the mmap handler when the mapping was successful. The
mmap handler must now return 0 when successful, any other value
is considered as an error. Previously, returning -1 was the only
way to fail. This change thus accidentally fixes some devices
which were bogusly returning errno constants which would have been
considered as addresses by the device pager.
- Garbage collect the poorly named pmap_phys_address() now that it's
no longer used.
- Convert all the d_mmap_t consumers to the new API.

I'm still not sure wheter we need a __FreeBSD_version bump for this,
since and we didn't guarantee API/ABI stability until 5.1-RELEASE.

Discussed with: alc, phk, jake
Reviewed by: peter
Compile-tested on: LINT (i386), GENERIC (alpha and sparc64)
Runtime-tested on: i386

Merged from sys/dev/syscons/syscons.c revision 1.393.

Fix compile error with FB_INSTALL_CDEV option.

MFi386: revision 1.554.

Change the console interface to pass a "struct consdev *" instead of a
dev_t to the method functions.

The dev_t can still be found at struct consdev *->cn_dev.

Add a void *cn_arg element to struct consdev which the drivers can use
for retrieving their softc.

Back out M_* changes, per decision of the TRB.

Approved by: trb

Change "dev_t gdbdev" to "void *gdb_arg", some possible paths for GDB
will not have a dev_t.

Remove #include <sys/dkstat.h>

Switch to use the TSC code i386/i386/tsc.c

Merged from sys/dev/sio/sio.c revision 1.383.

Reduce diff to i386/isa/clock.c by unifdef -DPC98

Typo in last commit

MFi386: write the correct weekday back to the RTC.

Oops, fix copyright again.

Noticed by: hrs

Fix copyright notification.

Split the global timezone structure into two integer fields to
prevent the compiler from optimizing assignments into byte-copy
operations which might make access to the individual fields non-atomic.

Use the individual fields throughout, and don't bother locking them with
Giant: it is no longer needed.

Inspired by: tjr

Split statclock into statclock and profclock, and made the method for driving
statclock based on profhz when profiling is enabled MD, since most platforms
don't use this anyway. This removes the need for statclock_process, whose
only purpose was to subdivide profhz, and gets the profiling clock running
outside of sched_lock on platforms that implement suswintr.
Also changed the interface for starting and stopping the profiling clock to
do just that, instead of changing the rate of statclock, since they can now
be separate.

Reviewed by: jhb, tmm
Tested on: i386, sparc64

Add CanBe power management controller support.

Submitted by: KIYOHARA Takashi <kiyohara@kk.iij4u.or.jp>

NO_GEOM cleanup: don't #include <sys/diskslice.h>

MFi386: revision 1.192.

NO_GEOM cleanup: retire to attic.

Remove pc98/wfd and pc98/wst drivers, they have been broken to the
point of not even compiling for a very long time.

Any effort spent unbreaking them would be better spent perfecting
the ata drivers for PC98, should any issues remain there.

Make tsc_freq a 64bit on PC98 also.

Remove BDE_DEBUGGER.

Discussed with: bde

Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.

#ifdef NO_GEOM these files entirely. When NO_GEOM is removed as an
option the files can be removed.

Merged from sys/isa/syscons_isa.c revision 1.21.

- Add inline functions for {ll,l,}abs() to libkern.
- Remove hand rolled abs() functions.

Merged from sys/isa/fd.c revision 1.244.

MFi386: revision 1.552.

Rename the dos_partition structure for pc98 to pc98_partition.

Merged from sys/isa/fd.c revision 1.243.

Remove unused second argument from DEV_STRATEGY().

Correct typos, mostly s/ a / an / where appropriate. Some whitespace cleanup,
especially in troff files.

Fix typos, mostly s/ an / a / where appropriate and a few s/an/and/
Add FreeBSD Id tag where missing.

Unspam some experimental changes which should not have been committed.

unifdef -DPC98 -U__alpha__

MFi386: revision 1.551.

Approved by: re (jhb)

MFi386: revision 1.550.

Merged from sys/isa/fd.c revision 1.242.

Print real / avail memory in megabytes rather than kilobytes.

Move the definitions of the hw.physmem, hw.usermem and hw.availpages
sysctls to MI code; this reduces code duplication and makes all of them
available on sparc64, and the latter two on powerpc.
The semantics by the i386 and pc98 hw.availpages is slightly changed:
previously, holes between ranges of available pages would be included,
while they are excluded now. The new behaviour should be more correct
and brings i386 in line with the other architectures.

Move physmem to vm/vm_init.c, where this variable is used in MI code.

Remove what was a temporary bogus assignment of bits of siginfo_t, as it does
not look like the prerequisites to fill it in properly will be in the tree
for the upcoming release, but it's mostly done, so there is no need for these
to stay around to remind us.

MFi386: revision 1.55.
Rename from atspeaker to pcspeaker. (PC98 is not PC/AT)

MFi386: revisions 1.544 and 1.545.

MFi386: revision 1.543.

Merged from sys/isa/syscons_isa.c revision 1.20.

MFi386: revisions 1.189 and 1.190.

Merged from sys/isa/syscons_isa.c revision 1.19.

Merged from sys/dev/syscons/syscons.c revision 1.390.

MFi386: revision 1.54.

Unbreak the PC98/wd(4) driver which I accidentally broke with a previous
commit. I can fully understand why the PC98 crew desire ata(4) support.

Tested by: nyan

Merged from sys/dev/sio/sio.c revision 1.382.

- kserunnable() is now sched_runnable() change instances of these where
appropriate.
- include sched.h to see this new api.

Fixed a warning if COM_MULTIPORT option is not defined.

Submitted by: Kaho Toshikazu <kaho@elam.kais.kyoto-u.ac.jp>

Fixed SBUS_RA_*_region_* functions.

MFi386: revision 1.67.

MFi386: revisions 1.539, 1.540 and 1.541.

Merged from sys/isa/fd.c revisions 1.224 and 1.241.

Don't use dkunit() to find our softc when we can hang it off the dev_t.

This removes yet a dependency on the old disklabel stuff.

Sponsored by: DARPA & NAI Labs.

Merge the last couple of my changes to fd.c into the pc98 version.

Sponsored by: DARPA & NAI Labs

Split MBR and PC98 on-disk sliceformats out from disklabel.h, step 1:

Peter had repocopied sys/disklabel.h to sys/diskpc98.h and sys/diskmbr.h.

These two new copies are still intact copies of disklabel.h and
therefore protected by #ifndef _SYS_DISKLABEL_H_ so #including them
in programs which already include <sys.disklabel.h> is currently a
no-op.

This commit adds a number of such #includes.

Once I have verified that I have fixed all the places which need fixing,
I will commit the updated versions of the three #include files.

Sponsored by: DARPA & NAI Labs.

Added some buggy PC-98 PnP cards support.

Merged from sys/isa/fd.c revision 1.238.

Merged from sys/dev/syscons/syscons.c revision 1.389.

Merged from sys/dev/sio/sio.c revisions 1.380 and 1.381.

Move the com_emr register definition to sioreg.h.

Merged from sys/dev/sio/sio.c revision 1.379.

MFi386: revisions 1.536 and 1.538.

use __packed.

Remove #ifdef/#endif 3 years after the stuff they protected was removed.

Spotted by: peter.

(This commit touches about 15 disk device drivers in a very consistent
and predictable way, and I apologize if I have gotten it wrong anywhere,
getting prior review on a patch like this is not feasible, considering
the number of people involved and hardware availability etc.)

If struct disklabel is the messenger: kill the messenger.

Inside struct disk we had a struct disklabel which disk drivers used to
communicate certain metrics to the disklayer above (GEOM or the disk
mini-layer). This commit changes this communication to use four
explicit fields instead.

Amongst the benefits is that the fields do not get overwritten by
wrong or bogus on-disk disklabels.

Once that is clear, <sys/disk.h> which is included in the drivers
no longer need to pull <sys/disklabel.h> and <sys/diskslice.h> in,
the few places that needs them, have gotten explicit #includes for
them.

The disklabel inside struct disk is now only for internal use in
the disk mini-layer, so instead of embedding it, we malloc it as
we need it.

This concludes (modulus any mistakes) the series of disklabel related
commits.

I belive it all amounts to a NOP for all the rest of you :-)

Sponsored by: DARPA & NAI Labs.

For reasons now lost in historical fog, the bounds_check_with_label()
function were put in i386/i386/machdep.c from where it has been
cut and pasted to other architectures with only minor corruption.

Disklabel is really a MI format in many ways, at least it certainly
is when you operate on struct disklabel.

Put bounds_check_with_label() back in subr_disklabel.c where it belongs.

Sponsored by: DARPA & NAI Labs.

#include <sys/disk.h> to get disk_err() prototype.

Sponsored by: DARPA & NAI Labs.

Make FreeBSD "struct disklabel" agnostic, step 311 of 723:

Rename diskerr() to disk_err() for naming consistency.

Drop the by now entirely useless struct disklabel argument.

Add a flag argument for new-line termination.

Fix a couple of printf-format-casts to %j instead of %l.

Correctly print the name of all bio commands.

Move the function from subr_disklabel.c to subr_disk.c,
and from <sys/disklabel.h> to <sys/disk.h>.

Use the new disk_err() throughout, #include <sys/disk.h> as needed.

Bump __FreeBSD_version for the sake of the aac disk drivers #ifdefs.

Remove unused disklabel members of softc for aac, amr and mlx, which seem
to originally have been intended for diskerr() use, but which only rotted
and got Copy&Pasted at least two times to many.

Sponsored by: DARPA & NAI Labs.

MFi386: revisions 1.534 and 1.535.

Merged from sys/isa/fd.c revisions 1.234, 1.235 and 1.236.

Merged from sys/dev/sio/sio.c revision 1.378.

Merged from sys/isa/syscons_isa.c revision 1.18.

Allocate KSEs and KSEGRPs separatly and remove them from the proc structure.
next step is to allow > 1 to be allocated per process. This would give
multi-processor threads. (when the rest of the infrastructure is
in place)

While doing this I noticed libkvm and sys/kern/kern_proc.c:fill_kinfo_proc
are diverging more than they should.. corrective action needed soon.

Fill out two fields (si_pid, si_uid) in the siginfo structure handed back
to userland in the signal handler that were not being iflled out before, but
should and can be.

This part of sendsig could be slightly refactored to use an MI interface, or
ideally, *sendsig*() would have an API change to accept a siginfo_t, which
would be filled out by an MI function in the level above sendsig, and said MI
function would make a small call into MD code to fill out the MD parts (some
of which may be bogus, such as the si_addr stuff in some places). This would
eventually make it possible for parts of the kernel sending signals to set up
a siginfo with meaningful information.

Reviewed by: mux
MFC after: 2 weeks

Diff reduction in comments for filling the siginfo structure - refer to
filling in the POSIX parts, when doing the same thing in every port of
FreeBSD.

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.

Take a shot at fixing up a whole stack of style and other embarresing
unforced errors that Bruce identified. I have not yet addressed all of
his concerns.

Change hw.physmem and hw.usermem to unsigned long like they used to be
in the original hardwired sysctl implementation.

The buf size calculator still overflows an integer on machines with large
KVA (eg: ia64) where the number of pages does not fit into an int. Use
'long' there.

Change Maxmem and physmem and related variables to 'long', mostly for
completeness. Machines are not likely to overflow 'int' pages in the
near term, but then again, 640K ought to be enough for anybody. This
comes for free on 32 bit machines, so why not?

Renamed poorly named setregs to exec_setregs. Moved its prototype to
imgact.h with the other exec support functions.

Replace various spelling with FALLTHROUGH which is lint()able

Merged from sys/dev/syscons/scvtb.c revision 1.9.

Merged from sys/dev/syscons/syscons.c revision 1.388.

Merged from sys/dev/syscons/syscons.c revisions 1.386 and 1.387.

de-count pckbd for pc98. This file is only compiled if NPCKBD was 1,
so the conditional compile should never have been used.

Use pmap_kenter() rather than vtopte() and bashing the page tables
directly.

MFi386: revision 1.524.

Check return status from fd_in() function.

MFi386: sys/i386/i386/machdep.c revision 1.522.

s/procrunnable/kserunnable/ in a comment

MFi386: revision 1.521

MFi386: sys/i386/i386/machdep.c rev. 1.520.

Merged from sys/dev/sio/sio.c revisions 1.376 and 1.377.

MFi386: sys/i386/isa/clock.c revision 1.187.

Backout previous change and merge from sys/dev/sio/sio.c revision 1.375.

Merged from sys/isa/fd.c revision 1.233.

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.

Fix typo in the BSD copyright: s/withough/without/

Spotted and suggested by: des
MFC after: 3 weeks

MFi386: revision 1.519

Merged from sys/isa/fd.c revisions from 1.229 to 1.232.

Merged from sys/dev/syscons/syscons.c revision 1.384

Don't export timecounter structures under debug. with sysctl, they
contain no truly interesting data anymore.

Tidy up some loose ends.
i386/ia64/alpha - catch up to sparc64/ppc:
- replace pmap_kernel() with refs to kernel_pmap
- change kernel_pmap pointer to (&kernel_pmap_store)
(this is a speedup since ld can set these at compile/link time)
all platforms (as suggested by jake):
- gc unused pmap_reference
- gc unused pmap_destroy
- gc unused struct pmap.pm_count
(we never used pm_count - we track address space sharing at the vmspace)

Simplify the RFC2783 and PPS_SYNC timestamp collection API.

Remove the tc_update() function. Any frequency change to the
timecounter will be used starting at the next second, which is
good enough for sysctl purposes. If better adjustment is needed
the NTP PLL should be used.

Merged from sys/dev/syscons/syscons.c revision 1.383

Rework the kernel environment subsystem. We now convert the static
environment needed at boot time to a dynamic subsystem when VM is
up. The dynamic kernel environment is protected by an sx lock.

This adds some new functions to manipulate the kernel environment :
freeenv(), setenv(), unsetenv() and testenv(). freeenv() has to be
called after every getenv() when you have finished using the string.
testenv() only tests if an environment variable is present, and
doesn't require a freeenv() call. setenv() and unsetenv() are self
explanatory.

The kenv(2) syscall exports these new functionalities to userland,
mainly for kenv(1).

Reviewed by: peter

MFi386: revision 1.517.

GC various bits and pieces of USERCONFIG from all over the place.

GC the "dumplo" variable, which is no longer used.

A lot of sys/*/*/machdep.c seems not to be.

Merged from sys/dev/syscons/syscons.c revisions 1.381 and 1.382.

Merged from sys/isa/fd.c revision 1.228.

Merged from sys/dev/sio/sio.c revisions 1.370 and 1.371.

Change callers of mtx_init() to pass in an appropriate lock type name. In
most cases NULL is passed, but in some cases such as network driver locks
(which use the MTX_NETWORK_LOCK macro) and UMA zone locks, a name is used.

Tested on: i386, alpha, sparc64

Moved signal handling and rescheduling from userret() to ast() so that
they aren't in the usual path of execution for syscalls and traps.
The main complication for this is that we have to set flags to control
ast() everywhere that changes the signal mask.

Avoid locking in userret() in most of the remaining cases.

Submitted by: luoqi (first part only, long ago, reorganized by me)
Reminded by: dillon

- Move the MI mutexes sched_lock and Giant from being declared in the
various machdep.c's to being declared in kern_mutex.c.
- Add a new function mutex_init() used to perform early initialization
needed for mutexes such as setting up thread0's contested lock list
and initializing MI mutexes. Change the various MD startup routines
to call this function instead of duplicating all the code themselves.

Tested on: alpha, i386

Change the suser() API to take advantage of td_ucred as well as do a
general cleanup of the API. The entire API now consists of two functions
similar to the pre-KSE API. The suser() function takes a thread pointer
as its only argument. The td_ucred member of this thread must be valid
so the only valid thread pointers are curthread and a few kernel threads
such as thread0. The suser_cred() function takes a pointer to a struct
ucred as its first argument and an integer flag as its second argument.
The flag is currently only used for the PRISON_ROOT flag.

Discussed on: smp@

MFi386: revision 1.508.

MFi386: revision 1.506.

MFi386: revision 1.507.

Compromise for critical*()/cpu_critical*() recommit. Cleanup the interrupt
disablement assumptions in kern_fork.c by adding another API call,
cpu_critical_fork_exit(). Cleanup the td_savecrit field by moving it
from MI to MD. Temporarily move cpu_critical*() from <arch>/include/cpufunc.h
to <arch>/<arch>/critical.c (stage-2 will clean this up).

Implement interrupt deferral for i386 that allows interrupts to remain
enabled inside critical sections. This also fixes an IPI interlock bug,
and requires uses of icu_lock to be enclosed in a true interrupt disablement.

This is the stage-1 commit. Stage-2 will occur after stage-1 has stabilized,
and will move cpu_critical*() into its own header file(s) + other things.
This commit may break non-i386 architectures in trivial ways. This should
be temporary.

Reviewed by: core
Approved by: core

Push BIO_FORMAT into a local hack inside the floppy drivers where
it belongs.

Merged from sys/dev/sio/sio.c revisions 1.366 and 1.369.

Merged from sys/dev/syscons/syscons.c revision 1.379.

Fix style.

MFi386: revision 1.65.

Remove __P.

MFi386: revision 1.505 (remove __P.)

MFi386: revision 1.504.

MFi386: revision 1.503.

Use the dx register for the destination port address. A immediate port
address of outb is only 8 bits.

Submitted by: chi@bd.mbn.or.jp (Chiharu Shibata)
MFC after: 3 days

MFi386: revision 1.502

Free allocated buffer at siodetach().

MFC after: 3 days

MFi386: revision 1.501

- The pc98_ttspeedtab() function returns an error status instead of a divisor,
and sets a divisor to the third argument.
- The second argument of the pc98_set_baud_rate() function is changed from int
to u_int.

MFi386: revision 1.498.

Simple p_ucred -> td_ucred changes to start using the per-thread ucred
reference.

Disksort will not "munge" requests, BIO_ORDERED or not, so remove
use of BIO_ORDERED.

MFi386: revision 1.497

Add bus_space_unmap() and bus_space_free() functions to release
a bus_space_handle allocated by bus_space_subregion().

- Split the routine to initialize a bus_space_handle into the separate
function.
- Only access a bus_space_handle if the resource type is SYS_RES_MEMORY or
SYS_RES_IOPORT.
- Add the bus_space_subregion supports.

MFi386: revisions 1.495 and 1.496

Fall through from AT_TYPE_DIRECT to AT_TYPE_CDROM.
Old ATAPI CD-ROM drives return 0 (direct-access) as the type of the device.

(The ata driver has the same problem.)

MFC after: 3 days

Cosmetic changes.

- Refine the iskanji1 function.
- Print continuous ascii characters at a time.

Submitted by: chi@bd.mbn.or.jp (Chiharu Shibata)

Fixed mouse cursor on a console.

Submitted by: chi@bd.mbn.or.jp (Chiharu Shibata)

MFi386: revisions 1.493 and 1.494.

Pre-KSE/M3 commit.
this is a low-functionality change that changes the kernel to access the main
thread of a process via the linked list of threads rather than
assuming that it is embedded in the process. It IS still embeded there
but remove all teh code that assumes that in preparation for the next commit
which will actually move it out.

Reviewed by: peter@freebsd.org, gallatin@cs.duke.edu, benno rice,

Use osigreturn(2) instead of sigreturn(2) plus broken magic for returning
from old signal handlers. This is simpler and faster, and fixes (new)
sigreturn(2) when %eip in the new signal context happens to match the
magic value (0x1d516). 0x1d516 is below the default ELF text section,
so this probably never broken anything in practice.

locore.s:
In addition, don't build the signal trampoline for old signal handlers
when it is not used.

alpha:
Not fixed, but seems to be even less broken in practice due to more
advanced magic. A false match occurs for register #32 in mc_regs[].
Since there is no hardware register #32, a false match is only possible
for direct calls to sigreturn(2) that happen to have the magic number
in the spare mc_regs[32] field.

Improve the change in the previous commit: use a stub for osigreturn()
when it is not really used instead of unconditionalizing all of it.

Compile osigreturn() unconditionally since it will always be needed on
some arches and the syscall table is machine-independent. It was
(bogusly) conditional on COMPAT_43, so this usually makes no difference.

ia64: in addition:
- replace the bogus cloned comment before osigreturn() by a correct one.
osigreturn() is just a stub fo ia64's.
- fix the formatting of cloned comment before sigreturn().
- fix the return code. use nosys() instead of returning ENOSYS to get
the same semantics as if the syscall is not in the syscall table.
Generating SIGSYS is actually correct here.
- fix style bugs.

powerpc: copy the cleaned up ia64 stub. This mainly fixes a bogus comment.

sparc64: copy the cleaned up the ia64 stub, since there was no stub before.

MFi386: revision 1.489.

Changed iskanji[12] to inline functions.

Merged from sys/dev/sio/{sio.c,sio_isa.c} revisions 1.363 and 1.5,
respectively.

MFi386: revision 1.180

MFi386: revision 1.52

MFi386: revision 1.64

Merged from sys/dev/sio/sio.c revisions from 1.360 to 1.362.

MFi386: revision 1.487

Clear the single-step flag for signal handlers. This fixes bogus trace
traps on the first instruction of signal handlers.

In trap.c:syscall(), fake a trace trap if the single-step flag was set
on entry to the kernel, not if it will be set on exit from the kernel.
This fixes bogus trace traps after the last instruction of signal handlers.

gdb-4.18 (the version in FreeBSD) still has problems with the program in
the PR. These seem to be due to bugs in gdb and not in FreeBSD, and are
fixed in gdb-5.1 (the distribution version).

PR: 33262
Tested by: k Macy <kip_macy@yahoo.com>
MFC after: 1 day

Merged from sys/dev/sio/sio.c revisions 1.354 and 1.358.

Change the preemption code for software interrupt thread schedules and
mutex releases to not require flags for the cases when preemption is
not allowed:

The purpose of the MTX_NOSWITCH and SWI_NOSWITCH flags is to prevent
switching to a higher priority thread on mutex releease and swi schedule,
respectively when that switch is not safe. Now that the critical section
API maintains a per-thread nesting count, the kernel can easily check
whether or not it should switch without relying on flags from the
programmer. This fixes a few bugs in that all current callers of
swi_sched() used SWI_NOSWITCH, when in fact, only the ones called from
fast interrupt handlers and the swi_sched of softclock needed this flag.
Note that to ensure that swi_sched()'s in clock and fast interrupt
handlers do not switch, these handlers have to be explicitly wrapped
in critical_enter/exit pairs. Presently, just wrapping the handlers is
sufficient, but in the future with the fully preemptive kernel, the
interrupt must be EOI'd before critical_exit() is called. (critical_exit()
can switch due to a deferred preemption in a fully preemptive kernel.)

I've tested the changes to the interrupt code on i386 and alpha. I have
not tested ia64, but the interrupt code is almost identical to the alpha
code, so I expect it will work fine. PowerPC and ARM do not yet have
interrupt code in the tree so they shouldn't be broken. Sparc64 is
broken, but that's been ok'd by jake and tmm who will be fixing the
interrupt code for sparc64 shortly.

Reviewed by: peter
Tested on: i386, alpha

MFi386: revision 1.178

Merged from sys/dev/syscons/syscons.c revision 1.377.

cosmetic changes.

MFi386: revision 1.179

MFi386: revision 1.486

Merged from sys/isa/{fd.c,fdreg.h} revisions 1.222 and 1.15, respectively.

Fixed to draw mouse cursor. The syscons driver for PC98 uses different
attributes from i386.

Submitted by: chi@bd.mbn.or.jp (Chiharu Shibata)
MFC after: 3 days

MFi386: revision 1.485 (the previous commit is not completely)

Overhaul the per-CPU support a bit:

- The MI portions of struct globaldata have been consolidated into a MI
struct pcpu. The MD per-CPU data are specified via a macro defined in
machine/pcpu.h. A macro was chosen over a struct mdpcpu so that the
interface would be cleaner (PCPU_GET(my_md_field) vs.
PCPU_GET(md.md_my_md_field)).
- All references to globaldata are changed to pcpu instead. In a UP kernel,
this data was stored as global variables which is where the original name
came from. In an SMP world this data is per-CPU and ideally private to each
CPU outside of the context of debuggers. This also included combining
machine/globaldata.h and machine/globals.h into machine/pcpu.h.
- The pointer to the thread using the FPU on i386 was renamed from
npxthread to fpcurthread to be identical with other architectures.
- Make the show pcpu ddb command MI with a MD callout to display MD
fields.
- The globaldata_register() function was renamed to pcpu_init() and now
init's MI fields of a struct pcpu in addition to registering it with
the internal array and list.
- A pcpu_destroy() function was added to remove a struct pcpu from the
internal array and list.

Tested on: alpha, i386
Reviewed by: peter, jake

Update to C99, s/__FUNCTION__/__func__/,
also don't use ANSI string concatenation.

Allow maxusers to be specified as 0 in the kernel config, which will
cause the system to auto-size to between 32 and 512 depending on the
amount of memory.

MFC after: 1 week

Split the sio driver for pc98 into bus front end and back end.
(merged from the files in sys/dev/sio)

MFi386: revision 1.483

Use make_dev_alias() instead of call make_dev() twice.

Don't call cdevsw_add().

Rename the top 7 bits if disk minors to spare bits, rather than type bits.

MFi386: sys/i386/i386/machdep.c revisions 1.481 and 1.482

Removed pmc_isa_identify function. It is not needed.

Submitted by: takawata

cn_tab no longer exists, use cnadd() to add a console device. Note that
this may result in duplicate console output in some cases.

Added the pmc driver which supports power management controller of
old NEC PC-98NOTE.

Submitted by: chi@bd.mbn.or.jp (Chiharu Shibata)
MFC after: 1 week

fix broken `compat_atdisk'(replace raw device name with block device's).

Reviewed by: nyan
MFC after: 3 days

Fix compile error of the case using `LINE30' option.

Reviewed by: nyan
MFC after: 3 days

First commit after a repo copy of isa/sio* -> dev/sio:

Move sio from isa/sio.c to dev/sio/sio.c. The next step is to break
out the front end attachments, improve support for these parts on
different busses, and maybe, if we're lucky, merging in pc98 support.
It will also be MI and live in conf/files rather than files.*.

Approved by: bde
Tested with: i386, pc98

Use the i386 version of npx.c. It has been merged with the pc98 version.

Approved by: nyan
Not tested by: bde

MFi386: sys/i386/isa/npx.c revisions from 1.114 to 1.116

Changed IO_NPXSIZE to 8

MFi386: sys/i386/isa/clock.c revision 1.177

MFi386: sys/i386/isa/pcaudio.c revision 1.63

Merged from sys/isa/sio.c revisions from 1.344 to 1.347

Rewrite the pc98 bus_space stuff.

The type of bus_space_tag_t is now a pointer to bus_space_tag structure,
and the bus_space_tag structure saves pointers to functions for direct
access and relocate access.

Added bsh_bam member to the bus_space_handle structure, it saves access
method either direct access or relocate access which is called by
bus_space_* functions.

Added the mecia device support. If the bs_da and bs_ra in bus tag are set
NEPC_io_space_tag and NEPC_mem_space_tag respectively, new bus_space stuff
changes the register of mecia automatically for 16bit access.

Obtained from: NetBSD/pc98

o Modify pc98 syscons code to use securelevel_gt() instead of
direct variable checks. (Yet another API to perform direct hardware I/O).

Obtained from: TrustedBSD Project

- Added #include <sys/systm.h>
- Cosmetic change

Whitespace fixes.

MFi386: sys/isa/fd.c revision from 1.205 to 1.219.

Allocate i/o and memory resources using gdc driver.

MFi386: cosmetic changes.

MFi386: sys/isa/sio.c revision 1.301, 1.336, 1.337, 1.338, 1.339 and 1.342.

Removed unnecessary PnP moden entries.

MFi386: sys/i386/isa/pcaudio.c revision 1.59 and 1.61.

MFi386: sys/i386/isa/mse.c revision 1.54 and 1.55.

MFi386: sys/i386/isa/clock.c revision 1.175 and 1.176.

Added (commented out) ACPI attachment.

MFi386: removed IDE_DELAY option.

Merged from sys/i386/isa/pcaudio.c revision 1.62 (KSE changes).

I don't think pc98 has acpi at all, so ifdef the acpi attachments for
now.

Merge sys/isa/sio.c 1.343
KSE changes

Reviewed by: julian, bde, jhb

Merge from sys/dev/syscons/syscons.c 1.373
kse changes

# Note: There are a number of trivial and non-trivial diffs between this and
# sys/dev/syscons/syscons.c that I didn't try to account for.

Reviewed by: julian, bde, jhb

Merge from sys/i386/isa/sprk.c 1.50, 1.51
KSE changes and acpi attachment

Reviewed by: julian, bde, jhb

Merge KSE changes from sys/dev/syscons/scterm-sc.c 1.17

# there are more "trivial" diffs in this file that have accumulated over time
# and I didn't try to fix those.

Reviewed by: julian, bde, jhb

KSE changes for olpt driver

Reviewed by: julian, bde, jhb

Merged sys/i386/isa/npx.c 1.110, 1.111, 1.112 KSE

Reviewed by: julian, bde, jhb

Changes necessary for KSE world

Reivewed by: julian, bde, jhb

Merge changes from sys/i386/isa/mse.c 1.56 and other tweaks for KSE

Reviewed by: julian, kde, jhb

Merge from sys/isa/fd.c 1.221 and a few minor tweaks to make compile
with the post KSE world.

Reviewed by: julian, bde, jhb

Merge from sys/i386/i386/machdep.c 1.480 (Julian's KSE changes)

Reviewed by: julian, bde, jhb

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

Merged from sys/i386/i386/machdep.c revision 1.479.

Zap #if 0'ed map init code that got moved to the MI area.
Convert the powerpc tree to use the common code.

Enable hardwiring of things like tunables from embedded enironments
that do not start from loader(8).

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.

Fix a #endif misplacement in 1.231 due to misapplied patch

Pointy hat to: peter

Merge i386/machdep.c rev 1.474: dont overextend %cs. (finally, it doesn't
conflict with unmerged changes)

Merge i386/machdep.c rev 1.469: whitespace changes to fit 80 columns

Forgotten by: jhb

Merge i386/machdep.c rev 1.468: make breakpoint/trace interrupt instead
of trap gates

Forgotten by: bde

Merge 386/machdep.c rev 1.467: fix bugs/miscalculations

Forgotten by: iwasaki

Identical to i386/machdep.c rev 1.473: move submap initialization to MI.

Merge i386/machdep.c rev 1.472: Fix bug in physmem_est and maxbcache
calculation

Forgotten by: dillon

Merge i386/machdep.c rev 1.470. Limit KVM for buffer cache etc.

Forgotten by: dillon

Dont compile in SSE fxsave/fxrstor instructions if CPU_ENABLE_SSE isn't
active.

Make COMPAT_43 optional again. XXX we need COMPAT_FBSD3 etc for this
stuff.

- Close races with signals and other AST's being triggered while we are in
the process of exiting the kernel. The ast() function now loops as long
as the PS_ASTPENDING or PS_NEEDRESCHED flags are set. It returns with
preemption disabled so that any further AST's that arrive via an
interrupt will be delayed until the low-level MD code returns to user
mode.
- Use u_int's to store the tick counts for profiling purposes so that we
do not need sched_lock just to read p_sticks. This also closes a
problem where the call to addupc_task() could screw up the arithmetic
due to non-atomic reads of p_sticks.
- Axe need_proftick(), aston(), astoff(), astpending(), need_resched(),
clear_resched(), and resched_wanted() in favor of direct bit operations
on p_sflag.
- Fix up locking with sched_lock some. In addupc_intr(), use sched_lock
to ensure pr_addr and pr_ticks are updated atomically with setting
PS_OWEUPC. In ast() we clear pr_ticks atomically with clearing
PS_OWEUPC. We also do not grab the lock just to test a flag.
- Simplify the handling of Giant in ast() slightly.

Reviewed by: bde (mostly)

Zap 'ptrace(PT_READ_U, ...)' and 'ptrace(PT_WRITE_U, ...)' since they
are a really nasty interface that should have been killed long ago
when 'ptrace(PT_[SG]ETREGS' etc came along. The entity that they
operate on (struct user) will not be around much longer since it
is part-per-process and part-per-thread in a post-KSE world.

gdb does not actually use this except for the obscure 'info udot'
command which does a hexdump of as much of the child's 'struct user'
as it can get. It carries its own #defines so it doesn't break
compiles.

Merged from sys/dev/syscons/syscons.c revisions 1.370, 1.371 and 1.372.

Merged from sys/dev/syscons/scterm-sc.c revision 1.16.

Removed PLIP support.

Convert the olpt driver to using new-bus stuff.

Merged from sys/dev/syscons/syscons.c revisions 1.367 and 1.368.

Merged from sys/i86/isa/npx.c revision 1.107.

Call the early tunable setup functions as soon as kern_envp is available.
Some things depend on hz being set not long after this.

Speed up console driver.

Submitted by: chi@bd.mbn.or.jp (Chiharu Shibata)

Integrate fdc.h into fd.c.

Merged from sys/i386/isa/npx.c revision 1.106.

Merged from sys/i386/isa/npx.c revision 1.105.

Merged from sys/i386/i386/machdep.c revisions 1.462 and 1.464.

Fixed conflict with sys/dev/syscons/syscons.h.

Submitted by: yokota

- Refine pc98 supports.
- Use bus_space stuff.
- Rename FDO_* -> FDC_* (obtained from NetBSD/pc98)

Added epson_inw function.

Merged from the following changes.

sys/dev/syscons/scvgarndr.c revision 1.11
sys/dev/syscons/scvtb.c revision 1.8
sys/dev/syscons/syscons.c revisions 1.361, 1.363, 1.364, 1.365 and 1.366
sys/isa/atkbd_isa.c revision 1.9
sys/isa/syscons_isa.c revision 1.17

Fix another missed pcb_savefpu reference (inside NPX_DEBUG)

Apply the i386 SSE mods to pc98 as well.

Added #include <sys/proc.h>

Submitted by: Kaho Toshikazu <kaho@elam.kais.kyoto-u.ac.jp>

Merged from sys/i386/i386/machdep.c revisions 1.459 and 1.460.

With Alfred's permission, remove vm_mtx in favor of a fine-grained approach
(this commit is just the first stage). Also add various GIANT_ macros to
formalize the removal of Giant, making it easy to test in a more piecemeal
fashion. These macros will allow us to test fine-grained locks to a degree
before removing Giant, and also after, and to remove Giant in a piecemeal
fashion via sysctl's on those subsystems which the authors believe can
operate without Giant.

Fixed warning message.

Submitted by: chi@bd.mbn.or.jp (Chiharu Shibata)

Repo copy i8237.h to dev/ic so we can get rid of some of the final vestiges
of includes of i386 files from non-i386 ports.

Add a new MI pointer to the process' trapframe p_frame instead of using
various differently named pointers buried under p_md.

Reviewed by: jake (in principle)

Enable interrupts again after disabling them in epson_{in,out}sw().
splx() doesn't do the equivalent of sti.

Merged from the following changes.

sys/isa/ppc.c revisions from 1.27 to 1.34
sys/isa/ppcreg.h revisions from 1.10 to 1.15
sys/isa/isareg.h revision 1.6

Merged from sys/isa/sio.c revision 1.335.

Merged from sys/i386/isa/isa_dma.c revision 1.7.

Merged from sys/isa/syscons_isa.c revision 1.16.

Merged from sys/dev/syscons/scterm-sc.c revison 1.15.

Merged from sys/dev/syscons/syscons.c revisons 1.358 and 1.360.

Merged from sys/isa/fd.c revisions 1.198, 1.199, 1.200, 1.202 and 1.204.

Fixed miss merging from revision 1.102.

Merged from sys/i386/isa/npx.c revision 1.102.

Merged from sys/i386/i386/machdep.c revisions 1.456 and 1.457.

Allocate all resources using keyboard controller.

With this commit, I hereby pronounce gensetdefs past its use-by date.

Replace the a.out emulation of 'struct linker_set' with something
a little more flexible. <sys/linker_set.h> now provides macros for
accessing elements and completely hides the implementation.

The linker_set.h macros have been on the back burner in various
forms since 1998 and has ideas and code from Mike Smith (SET_FOREACH()),
John Polstra (ELF clue) and myself (cleaned up API and the conversion
of the rest of the kernel to use it).

The macros declare a strongly typed set. They return elements with the
type that you declare the set with, rather than a generic void *.

For ELF, we use the magic ld symbols (__start_<setname> and
__stop_<setname>). Thanks to Richard Henderson <rth@redhat.com> for the
trick about how to force ld to provide them for kld's.

For a.out, we use the old linker_set struct.

NOTE: the item lists are no longer null terminated. This is why
the code impact is high in certain areas.

The runtime linker has a new method to find the linker set
boundaries depending on which backend format is in use.

linker sets are still module/kld unfriendly and should never be used
for anything that may be modular one day.

Reviewed by: eivind

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.

Move the files from i386/isa/ic/ to dev/ic/.

Nuke the various poorly maintained copies of ioctl_fd.h. The file is
not machine-dependant, thus it has been moved out (repo-copied) into
<sys/fdcio.h>.

Move out the files from src/sys/isa/ic/ to src/sys/dev/ic/, so they
can be made userland-visible as <dev/ic/...>. Also, those files are
not supposed to contain any bus-specific details at all, so placing
them under .../isa/ has been a misnomer from the beginning.

The files in src/sys/dev/ic/ have been repo-copied from their old
location (this commit is a forced null commit there to record this
message).

Merged from sys/kern/subr_diskmbr.c revision 1.45.

Merged from sys/kern/subr_diskmbr.c revision 1.52.

Merged from sys/i386/i386/machdep.c revision 1.454.

Disabled unneeded code for PC98.

Submitted by: NOKUBI Hirotaka <nokubi@ff.iij4u.or.jp>