CVS log for src/sys/arch/amd64/acpi/acpi_wakeup_low.S

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Drop NENTRY() from the x86 kernels, use ENTRY(). With PMCs (and other hardware
tracing facilities) we have a much better ways of monitoring the CPU activity
than GPROF, without software modification.

Also I think GPROF has never worked, because the 'start' functions of both
i386 and amd64 use ENTRY(), and it would have caused a function call while the
kernel was not yet relocated.

update from HEAD

Use NENTRY -> END.

Improve our segregs model. Pass 3/3.

Treat %gs the same way we treat %ds/%es/%fs: restore it in INTRFASTEXIT
on 32bit LWPs.

On Xen however, its behavior does not change, because we need to do an
hypercall before INTR_RESTORE_GPRS, and that's too complicated for now.

As a side effect, this change fixes a bug in the ACPI wakeup code; %fs/%gs
were not restored on 32bit LWPs, and chances are they would segfault
shortly afterwards.

Support for USER_LDT on amd64 is almost complete now.

Improve our segregs model. Pass 1/3.

Right now, we are saving and restoring %ds/%es each time we enter/leave the
kernel. However, we let %fs/%gs live in the kernel space, and we rely on
the fact that when switching to an LWP, %fs/%gs are set right away (via
cpu_switchto or setregs).

It has two drawbacks: we are taking care of %ds/%es while they are
deprecated (useless) on 64bit LWPs, and we are restricting %fs/%gs while
they still have a meaning on 32bit LWPs.

Therefore, handle 32bit and 64bit LWPs differently:
 * 64bit LWPs use fixed segregs, which are not taken care of.
 * 32bit LWPs have dynamic segregs, always saved/restored.

For now, only %ds and %es are changed; %fs and %gs will be in the next
passes.

The trapframe is constructed as usual. In INTRFASTEXIT, we restore %ds/%es
depending on the %cs value. If %cs contains one of the two standard 64bit
selectors, don't do anything. Otherwise, restore everything.

When doing a context switch, just restore %ds/%es to their default values.
On a 32bit LWP they will be overwritten by INTRFASTEXIT; on a 64bit LWP
they won't be updated.

In the ACPI wakeup code, restore %ds/%es to the default 64bit user value.

Make sure %edx is clear.

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KNF, and reduce the diff between amd64 and i386.

Sync w/ -current. 34 merge conflicts to follow.

Sync with HEAD.

sync with head.

sync with head.

Share cpu.h between the x86 ports.

sync with head

sync with HEAD

Sync with HEAD

Sync with HEAD.

Sync with head.

file acpi_wakeup_low.S was added on branch yamt-lazymbuf on 2008-01-21 09:35:13 +0000

file acpi_wakeup_low.S was added on branch matt-armv6 on 2008-01-09 01:44:41 +0000

Add new IPI for saving CPU state explicitly, share high-level part of
ACPI wakeup code and teach it how to start the APs again. As a side
effect the CPU_START interface allows choosing between different
bootstrap codes more easily now.

sync with head.

Merge jmcneill-pm branch.

Exploit that PAE support implies PSE support and simplify the low-level
wake code to just load some useful values for cr0 and cr4 similiar to
what locore.S does. Load the real GDT from acpi_md_sleep_exit as well.

Don't save and restore registers that are not necessary to be preserved
in the amd64 ABI.

Use $-1 and not -1 for the return path.

Also update name in .type to match the label.

Change code flow below acpi_md_sleep.

Before:
- acpi_md_sleep calls acpi_savecpu
- acpi_savecpu saves registers and returns with -1
- acpi_md_sleep now patches the wakecode and calls AcpiEnterSleepState
- on resume, acpi_restorecpu restores registers and returns at the same
place as acpi_savecpu did with 0.

After:
- acpi_md_sleep calls acpi_md_sleep_prepare
- acpi_md_sleep_prepare saves registers and calls acpi_md_sleep_enter
- acpi_md_sleep_enter patches the wakecode and calls
AcpiEnterSleepState. It only returns on error.
- on resume, acpi_md_sleep_exit gets called, restores the registers and
returns as acpi_md_sleep_prepare with 0.

Add newline at end of file.

Save and restore MSR_EFER explicitly as the NOX bit is needed for
manipulation of the GDT. With that ltr and lldt can finally be done and
AMD64 fully resume now.

Save kernelgsbase and gsbase directly instead of playing with swapgs.

Sync with HEAD.

Follow the merge of pmap.c on i386 and amd64 and move
pmap_init_tmp_pgtbl into arch/x86/x86/pmap.c. Modify the ACPI wakeup
code to restore CR4 before jumping back into kernel space as the large
page option might cover that.

Don't try to save and restore fs and gs, just zero them on resume.

Save and restore FS and GS base.

Restore cr0 and cr8 while we're here.

Add work-in-progress remerge of i386 changes for the ACPI wakecode
and changes to adopt it to AMD64.

file acpi_wakeup_low.S was initially added on branch jmcneill-pm.