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

1 files changed, 2 insertions, 0 deletions

diff --git a/sys/i386/include/smp.h b/sys/i386/include/smp.h
index 04d67c9..43172d6 100644
--- a/sys/i386/include/smp.h
+++ b/sys/i386/include/smp.h
@@ -53,12 +53,14 @@ inthand_t
 	IDTVEC(invlcache),	/* Write back and invalidate cache */
 	IDTVEC(ipi_intr_bitmap_handler), /* Bitmap based IPIs */ 
 	IDTVEC(cpustop),	/* CPU stops & waits to be restarted */
+	IDTVEC(cpususpend),	/* CPU suspends & waits to be resumed */
 	IDTVEC(rendezvous),	/* handle CPU rendezvous */
 	IDTVEC(lazypmap);	/* handle lazy pmap release */
 
 /* functions in mp_machdep.c */
 void	cpu_add(u_int apic_id, char boot_cpu);
 void	cpustop_handler(void);
+void	cpususpend_handler(void);
 void	init_secondary(void);
 void	ipi_all_but_self(u_int ipi);
 #ifndef XEN