$Id$ -> $FreeBSD$

Go back to the old (icu.s rev.1.7 1993) way of keeping the AST-pending
bit separate from ipending, since this is simpler and/or necessary for
SMP and may even be better for UP.

Reviewed by: alc, luo

Go back to the old (icu.s rev.1.7 1993) way of keeping the AST-pending
bit separate from ipending, since this is simpler and/or necessary for
SMP and may even be better for UP.

Reviewed by: alc, luoqi, tegge

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Moved cpu_set_fork_handler's prototype from <machine/cpu.h> to <sys/proc.h>.

Suggested by: bde

Added a hopefully-machine-independent macro for determining if a
reschedule is pending.

More -Wall / -Wcast-qual cleanup. Also, EXEC_SET can't use
C_DECLARE_MODULE due to the linker_file_sysinit() function
making modifications to the data.

- hw.machine_arch returns cpu architecture type.
- moved definition of MACHINE_ARCH from cpu.h to parm.h as alpha.
- Added definitions of _MACHINE and _MACHINE_ARCH.
- Added hw.ispc98. The hw.ispc98

- hw.machine_arch returns cpu architecture type.
- moved definition of MACHINE_ARCH from cpu.h to parm.h as alpha.
- Added definitions of _MACHINE and _MACHINE_ARCH.
- Added hw.ispc98. The hw.ispc98 is 1 in PC98 kernel and is 0 in
IBM-PC kernel.

Discussed with: John Birrell <jb@FreeBSD.ORG>

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Don't include <machine/cputypes.h> or declare cputype/class interfaces
in <machine/cpu.h>. Moved the declarations to <machine/cputypes.h>.
Fixed style bugs in the moved code. Fixed everything that

Don't include <machine/cputypes.h> or declare cputype/class interfaces
in <machine/cpu.h>. Moved the declarations to <machine/cputypes.h>.
Fixed style bugs in the moved code. Fixed everything that depended on
the nested include. Don't include <machine/cpu.h> (in the changed files)
unless something in it is used directly.

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Moved declaration of etext from <machine/md_var.h> to <machine/cpu.h>
and fixed everything that dependended on it being declared in the old
place. It is used in "machine-independent" code in subr_pr

Moved declaration of etext from <machine/md_var.h> to <machine/cpu.h>
and fixed everything that dependended on it being declared in the old
place. It is used in "machine-independent" code in subr_prof.c.

Moved declaration of btext from subr_prof.c to <machine/cpu.h>. It
is machine-dependent.

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Move MACHINE_ARCH definition from <machine/param.h> to <machine/cpu.h>.

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

Revert my previous commit about using CS_SECURE macro.
Requested by: Bruce.

Use CS_SECURE macro.
Reviewed by: John Dyson

VM86 kernel support.
Work done by BSDI, Jonathan Lemon <jlemon@americantv.com>,
Mike Smith <msmith@gsoft.com.au>, Sean Eric Fagan <sef@kithrup.com>,
and probably alot of others.
Submitted by: Jnat

VM86 kernel support.
Work done by BSDI, Jonathan Lemon <jlemon@americantv.com>,
Mike Smith <msmith@gsoft.com.au>, Sean Eric Fagan <sef@kithrup.com>,
and probably alot of others.
Submitted by: Jnathan Lemon <jlemon@americantv.com>

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The biggie: Get rid of the UPAGES from the top of the per-process address
space. (!)

Have each process use the kernel stack and pcb in the kvm space. Since
the stacks are at a different address, we

The biggie: Get rid of the UPAGES from the top of the per-process address
space. (!)

Have each process use the kernel stack and pcb in the kvm space. Since
the stacks are at a different address, we cannot copy the stack at fork()
and allow the child to return up through the function call tree to return
to user mode - create a new execution context and have the new process
begin executing from cpu_switch() and go to user mode directly.
In theory this should speed up fork a bit.

Context switch the tss_esp0 pointer in the common tss. This is a lot
simpler since than swithching the gdt[GPROC0_SEL].sd.sd_base pointer
to each process's tss since the esp0 pointer is a 32 bit pointer, and the
sd_base setting is split into three different bit sections at non-aligned
boundaries and requires a lot of twiddling to reset.

The 8K of memory at the top of the process space is now empty, and unmapped
(and unmappable, it's higher than VM_MAXUSER_ADDRESS).

Simplity the pmap code to manage process contexts, we no longer have to
double map the UPAGES, this simplifies and should measuably speed up fork().

The following parts came from John Dyson:

Set PG_G on the UPAGES that are now in kernel context, and invalidate
them when swapping them out.

Move the upages object (upobj) from the vmspace to the proc structure.

Now that the UPAGES (pcb and kernel stack) are out of user space, make
rfork(..RFMEM..) do what was intended by sharing the vmspace
entirely via reference counting rather than simply inheriting the mappings.

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

Deleted i386_cpus[]. i386_cpus[] is a static variable in identcpu.c.

Found-by: lint

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

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

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

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

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

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trap.c:
Fixed profiling of system times. It was pre-4.4Lite and didn't support
statclocks. System times were too small by a factor of 8.

Handle deferred profiling ticks the 4.4Lite way: use addupc

trap.c:
Fixed profiling of system times. It was pre-4.4Lite and didn't support
statclocks. System times were too small by a factor of 8.

Handle deferred profiling ticks the 4.4Lite way: use addupc_task() instead
of addupc(). Call addupc_task() directly instead of using the ADDUPC()
macro.

Removed vestigial support for PROFTIMER.

switch.s:
Removed addupc().

resourcevar.h:
Removed ADDUPC() and declarations of addupc().

cpu.h:
Updated a comment. i386's never were tahoe's, and the deferred profiling
tick became (possibly) multiple ticks in 4.4Lite.

Obtained from: mostly from NetBSD

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Moved declaration of bootverbose to a better place. It isn't
machine-dependent.

Moved declaration of cpu_fork() to a better place. Only its
implementation is machine-dependent.

Add wall_cmos_clock sysctl variable, needed to manage adjkerntz even for
UTC cmos clocks (needed for Local Timezone FSes)

Parenthesized macros.

Fixed munged tabs.

Make the bootinfo structure visible from sysctl.
This can be used in libdisk to guess a better bios-geometry.

Correct the definition for the (unused) cpu_setstack().

Disable CLKF_BASEPRI() again. I forgot to edit an unwanted change out of
the diffs for the previous commit.

i386/exception.s,
Keep track of interrupt nesting level. It is normally 0
for syscalls and traps, but is fudged to 1 for their exit
processing in case they metamorphose into an interrupt
handler

i386/exception.s,
Keep track of interrupt nesting level. It is normally 0
for syscalls and traps, but is fudged to 1 for their exit
processing in case they metamorphose into an interrupt
handler.

i386/genassym.c;
Remove support for the obsolete pcb_iml and pcb_cmap2.

Add support for pcb_inl.

i386/swtch.s:
Fudge the interrupt nesting level across context switches and in
the idle loop so that the work for preemptive context switches
gets counted as interrupt time, the work for voluntary context
switches gets counted mostly as system time (the part when
curproc == 0 gets counted as interrupt time), and only truly idle
time gets counted as idle time.

Remove obsolete support (commented out and otherwise) for pcb_iml.

Load curpcb just before curproc instead of just after so that
curpcb is always valid if curproc is. A few more changes like
this may fix tracing through context switches.

Remove obsolete function swtch_to_inactive().

include/cpu.h:
Use the new interrupt nesting level variable to implement a
non-fake CLF_INTR() so that accounting for the interrupt state
works.

You can use top, iostat or (best) an up to date systat to see
interrupt overheads. I see the expected huge interrupt overheads
for ISA devices (on a 486DX/33, about 55% for an IDE drive
transferring 1250K/sec and the same for a WD8013EBT network card
transferring 1100K/sec). The huge interrupt overheads for serial
devices are unfortunately normally invisible.

include/pcb.h:
Remove the obsolete pcb_iml and pcb_cmap2. Replace them by
padding to preserve binary compatibility.

Use part of the new padding for pcb_inl.

isa/icu.s:
isa/vector.s:
Keep track of interrupt nesting level.

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Declare "extern int bootverbose", so that device-drivers and others
easily can find it.