sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

x86: Move i386 timerreg.h to x86

Reviewed by: emaste, jhb
Differential Revision: https://reviews.freebsd.org/D39656
MFC after: 1 month

x86: Move i386 ppireg.h to x86

Differential Revision: https://reviews.freebsd.org/D39655
MFC after: 1 month

Fix resume on i386 PAE.

It was broken before PAE/no-PAE merge, but since now PAE is the
default, resume is apparently becomes for all machines.

The corrected issues:
- the trampoline page is not mapped executable, so machine faults when
paging is on;
- MSR.EFER and %cr4 both should be loaded before paging is enabled,
otherwise paging structures are invalid (cr4.PAE and EFER.NX).
- MSR.EFER and %cr4 should be only loaded if present. I attempt to handle
this by not touching the registers if the value is zero.

There are some more bits still not quite correct, e.g. unconditional
access to %cr4 in resumectx.

Reported and debugging help by: bde
Sponsored by: The FreeBSD Foundation
MFC after: 1 week

Rename assym.s to assym.inc

assym is only to be included by other .s files, and should never
actually be assembled by itself.

Reviewed by: imp, bdrewery (earlier)
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D14180

Minor cleanups found while fixing a bug involving double mapping of low
memory:

Load the kernel eflags less magically, as in locore. The magic increased
when I removed eflags from the pcb in r305899.

Remove a jump to low memory that became garbage when the i386 version was
mostly replaced by the amd64 version in r235622.

The amd64 version is very similar. It still loads the flags magically,
but is not missing comments about using the special page table.

Reviewed by: kib

Correct a comment brought over from amd64. i386 doesn't use long
mode.

- Fix resumectx() prototypes to reflect reality.
- For i386, simply jump to resumectx() with PCB in %ecx.
- Fix a style(9) nit while I am here.

Add x86/acpica/acpi_wakeup.c for amd64 and i386. Difference of
suspend/resume procedures are minimized among them.

common:
- Add global cpuset suspended_cpus to indicate APs are suspended/resumed.
- Remove acpi_waketag and acpi_wakemap from acpivar.h (no longer used).
- Add some variables in acpi_wakecode.S in order to minimize the difference
among amd64 and i386.
- Disable load_cr3() because now CR3 is restored in resumectx().

amd64:
- Add suspend/resume related members (such as MSR) in PCB.
- Modify savectx() for above new PCB members.
- Merge acpi_switch.S into cpu_switch.S as resumectx().

i386:
- Merge(and remove) suspendctx() into savectx() in order to match with
amd64 code.

Reviewed by: attilio@, acpi@

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

MFamd64: (based on) r209957

Move logic of building ACPI headers for acpi_wakeup.c into better places,
remove intermediate makefile and shell script, and reduce diff between i386
and amd64.

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

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

Minor tweaks to the resume code. Previous commit reverted alignment back
to 4. There is no need to be more strict at assembly time since we copy
the code anyway to a private page.

* Clear the direction flag and eflags. Probably not necessary but it won't
hurt to be safe.
* Add prefixes to all instructions to prevent any assembler mistakes.
* Remove zeroing of eax - edi. We use those registers immediately after
to transfer values to protected mode so this was pointless.
* Update comments to reflect info found during code review.

Move the reset beep tunable/sysctl to debug.acpi.resume_beep. This makes
more sense than under hw.acpi. Also, document this in the man page.

Minor tweaks to the resume code that might help people debug.

* Add hw.acpi.resume_beep tunable and sysctl, default to 0. Beeps the PC
speaker soon after waking to diagnose whether the wakeup code is even
getting run before other drivers possibly hang the system. To stop the beep,
cause another beep (i.e. keyboard bell). Submitted by takawata@, I changed
the frequency to be lower.

* Use 4096 instead of 4 byte alignment. Might be useful although doesn't
seem to be necessary.

* Remove a useless assignment to acpi_reset_video. It was overwritten by
the default sysctl value anyway.

Pick up the selectors to use for various kernel segments from assym.s
instead of assuming fixed offsets within the GDT. The hard-coded
values here have been incorrect since Peter's GDT rearranging around
10 days ago, causing ACPI resume problems.

Reviewed by: peter

Use <machine/asmacros.h> since <machine/asm.h> is a userland-only header
and gives very wrong macros for ENTRY(), etc. for kernel programs.

PR:
Suggested by: bde
Reviewed by:
Approved by:
Obtained from:
MFC after:

Fix the logic to match the new name of the tunable.

Pointed out by: iwasaki

Change the reset video option to be positive (hw.acpi.reset_video).
Requested by: jhb

Initialize the real mode stack. This is needed at least for the return
address from the lcall.
Requested by: takawata

Fix style bugs in acpi_wakecode.S
Requested by: bde

Remove the kernel option now that we have the tunable.

Add sysctl MIB and loader tunable `hw.acpi.no_reset_video' as
the same effect as ACPI_NO_RESET_VIDEO kernel option.

Add kernel option ACPI_NO_RESET_VIDEO as workaround for problems
(e.g. LCD white-out after resume) on some machine cased by
re-initialize video BIOS code in acpi_wakecode.

Call the VESA reset BIOS vector on the resume path. This may help displays
after resume. I have not found it to break anything.

Style cleanups.

Use __FBSDID().

Add ACPI S2-S4BIOS Suspend/Resume code.
Some problems may remain.

Reviewed by:iwasaki