Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

MFppc64:

Kernel sources for 64-bit PowerPC, along with build-system changes to keep
32-bit kernels compiling (build system changes for 64-bit kernels are
coming later). Existing 32-bit PowerPC kernel configurations must be
updated after this change to specify their architecture.

Modularize the Open Firmware client interface to allow run-time switching
of OFW access semantics, in order to allow future support for real-mode
OF access and flattened device frees. OF client interface modules are
implemented using KOBJ, in a similar way to the PPC PMAP modules.

Because we need Open Firmware to be available before mutexes can be used on
sparc64, changes are also included to allow KOBJ to be used very early in
the boot process by only using the mutex once we know it has been initialized.

Reviewed by: marius, grehan

Add support for kernel profiling for both AIM and BookE.

Obtained from: Juniper Networks, Inc (BookE support).

MFp4: SMP support

Make sure tmpstk is aligned and make it 8KB in size -- not 8KB+16.

Allocate a stack (with optional guard pages) for thread0 and
switch to it before calling mi_startup().

For AIM, have cpu_idle() set MSR_POW when the powerpc_pow_enabled
variable is set. On my Mac Mini this puts the CPU in NAP mode when
the kernel is idle and, any technical or environmental reasons
aside, avoids that I have to listen to the fan all day :-)

Avoid hardcoding the kernel link address in the linker script.
Use KERNBASE instead. While here, move the text sections
forward to the beginning of the text segment.

Forced commit to record that this file was repocopied from
src/sys/powerpc/powerpc and modified for its new location.

Copy SPRG0-3 registers at boot-time and restore when calling into
OpenFirmware. FreeBSD/ppc uses SPRG0 as the per-cpu data area pointer,
and SPRG1-3 as temporary registers during exception handling. There
have been a few instances where OpenFirmware does require these to
be part of it's context, such as cd-booting an eMac.

reported by: many
MFC after: 3 days

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

Instead of "OpenFirmware", "openfirmware", etc. use the official spelling
"Open Firmware" from IEEE 1275 and OpenFirmware.org (no pun intended).

Ok'ed by: tmm

Bring KDB stack size into line with thread stack size (4 pages).

No need for ddb option. Never a need for ipkdb option.

Interrupt statistics, vmstat -i now works.

Submitted by: Suleiman Souhlal <refugee@segfaulted.com>
Slightly modified by: grehan
Derived from: i386

- Add definition for GET_CPUINFO, required by new trap_subr code
- garbage-collect unused defs

Remove BAT invalidation. This is done later in the boot sequence,
so isn't required here, and seems to cause problems when booting
from disk.

Approved by: benno

- moved intrcnt/intrnames to locore.s to fix sysctl -a panic

Approved by: benno

- Make sure we don't trample our metadata pointer in our initial bootstrap.
- Load metadata parameters.

- Use tmpstk exclusively in the init path.
- Remove redundant code.

Submitted by: Peter Grehan <peterg@ptree32.com.au>

Many fixes to low-level trap and interrupt handling:

- Tidy up clock code. Don't repeatedly call hardclock().
- Remove intrnames, decrnest and intrcnt from locore.s
- Coalesce all trap handling into a single stub that then calls a dispatch
function.

Submitted by: Peter Grehan <peterg@ptree32.com.au>

Commit of stuff that's been sitting in my tree for a while.

Highlights include:
- New low-level trap code from NetBSD. The high level code still needs a lot
of work.
- Fixes for some pmap handling in thread switching.
- The kernel will now get to attempting to jump into init in user mode. There
are some pmap/trap issues which prevent it from actually getting there though.

Obtained from: NetBSD (parts)

- Prevent the decrementer interrupt handler from nesting.
- Catch some more cases of PSL_EE and PSL_RI getting out of sync.

Make fork work, at least for kthreads. Switching still has some issues.

Complete rework of the PowerPC pmap and a number of other bits in the early
boot sequence.

The new pmap.c is based on NetBSD's newer pmap.c (for the mpc6xx processors)
which is 70% faster than the older code that the original pmap.c was based
on. It has also been based on the framework established by jake's initial
sparc64 pmap.c.

There is no change to how far the kernel gets (it makes it to the mountroot
prompt in psim) but the new pmap code is a lot cleaner.

Obtained from: NetBSD (pmap code)

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

Clean up the trap handling code and make it consistent with the other platforms.

Submitted by: jhb

Update PowerPC MD code to compile and do initial bootstrap based on
recent changes (KSE and VM requiring physmem to be setup).

Reviewed by: benno, jhb, julian

Forced commit due to commit mishap.

Change the name of the entry point symbol from 'start' to '__start' to be in
sync with the ldscript.

Fix comment breakage.

Bring in NetBSD code used in the PowerPC port.

Reviewed by: obrien, dfr
Obtained from: NetBSD