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@

7 files changed, 196 insertions, 630 deletions

diff --git a/sys/amd64/acpica/acpi_switch.S b/sys/amd64/acpica/acpi_switch.S
deleted file mode 100644
index 11e5356..0000000
--- a/sys/amd64/acpica/acpi_switch.S
+++ /dev/null
@@ -1,177 +0,0 @@
-/*-
- * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org>
- * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
- * Copyright (c) 2008-2012 Jung-uk Kim <jkim@FreeBSD.org>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- *
- * $FreeBSD$
- */
-
-#include <machine/asmacros.h>
-#include <machine/specialreg.h>
-
-#include "acpi_wakedata.h"
-#include "assym.s"
-
-#define	WAKEUP_CTX(member)	wakeup_ ## member - wakeup_ctx(%rsi)
-
-ENTRY(acpi_restorecpu)
-	/* Switch to KPML4phys. */
-	movq	%rdi, %cr3
-
-	/* Restore GDT. */
-	lgdt	WAKEUP_CTX(gdt)
-	jmp	1f
-1:
-
-	/* Fetch PCB. */
-	movq	WAKEUP_CTX(pcb), %rdi
-
-	/* Force kernel segment registers. */
-	movl	$KDSEL, %eax
-	movw	%ax, %ds
-	movw	%ax, %es
-	movw	%ax, %ss
-	movl	$KUF32SEL, %eax
-	movw	%ax, %fs
-	movl	$KUG32SEL, %eax
-	movw	%ax, %gs
-
-	movl	$MSR_FSBASE, %ecx
-	movl	PCB_FSBASE(%rdi), %eax
-	movl	4 + PCB_FSBASE(%rdi), %edx
-	wrmsr
-	movl	$MSR_GSBASE, %ecx
-	movl	PCB_GSBASE(%rdi), %eax
-	movl	4 + PCB_GSBASE(%rdi), %edx
-	wrmsr
-	movl	$MSR_KGSBASE, %ecx
-	movl	PCB_KGSBASE(%rdi), %eax
-	movl	4 + PCB_KGSBASE(%rdi), %edx
-	wrmsr
-
-	/* Restore EFER. */
-	movl	$MSR_EFER, %ecx
-	movl	WAKEUP_CTX(efer), %eax
-	wrmsr
-
-	/* Restore fast syscall stuff. */
-	movl	$MSR_STAR, %ecx
-	movl	WAKEUP_CTX(star), %eax
-	movl	4 + WAKEUP_CTX(star), %edx
-	wrmsr
-	movl	$MSR_LSTAR, %ecx
-	movl	WAKEUP_CTX(lstar), %eax
-	movl	4 + WAKEUP_CTX(lstar), %edx
-	wrmsr
-	movl	$MSR_CSTAR, %ecx
-	movl	WAKEUP_CTX(cstar), %eax
-	movl	4 + WAKEUP_CTX(cstar), %edx
-	wrmsr
-	movl	$MSR_SF_MASK, %ecx
-	movl	WAKEUP_CTX(sfmask), %eax
-	wrmsr
-
-	/* Restore CR0 except for FPU mode. */
-	movq	PCB_CR0(%rdi), %rax
-	andq	$~(CR0_EM | CR0_TS), %rax
-	movq	%rax, %cr0
-
-	/* Restore CR2 and CR4. */
-	movq	PCB_CR2(%rdi), %rax
-	movq	%rax, %cr2
-	movq	PCB_CR4(%rdi), %rax
-	movq	%rax, %cr4
-
-	/* Restore descriptor tables. */
-	lidt	PCB_IDT(%rdi)
-	lldt	PCB_LDT(%rdi)
-
-#define	SDT_SYSTSS	9
-#define	SDT_SYSBSY	11
-
-	/* Clear "task busy" bit and reload TR. */
-	movq	PCPU(TSS), %rax
-	andb	$(~SDT_SYSBSY | SDT_SYSTSS), 5(%rax)
-	movw	PCB_TR(%rdi), %ax
-	ltr	%ax
-
-#undef	SDT_SYSTSS
-#undef	SDT_SYSBSY
-
-	/* Restore debug registers. */
-	movq	PCB_DR0(%rdi), %rax
-	movq	%rax, %dr0
-	movq	PCB_DR1(%rdi), %rax
-	movq	%rax, %dr1
-	movq	PCB_DR2(%rdi), %rax
-	movq	%rax, %dr2
-	movq	PCB_DR3(%rdi), %rax
-	movq	%rax, %dr3
-	movq	PCB_DR6(%rdi), %rax
-	movq	%rax, %dr6
-	movq	PCB_DR7(%rdi), %rax
-	movq	%rax, %dr7
-
-	/* Restore FPU state. */
-	fninit
-	movq	WAKEUP_CTX(fpusave), %rbx
-	movq	WAKEUP_CTX(xsmask), %rax
-	testq	%rax, %rax
-	jz	1f
-	movq	%rax, %rdx
-	shrq	$32, %rdx
-	movl	$XCR0, %ecx
-/*	xsetbv	*/
-	.byte	0x0f, 0x01, 0xd1
-/*	xrstor	(%rbx) */
-	.byte	0x0f, 0xae, 0x2b
-	jmp	2f
-1:
-	fxrstor	(%rbx)
-2:
-
-	/* Reload CR0. */
-	movq	PCB_CR0(%rdi), %rax
-	movq	%rax, %cr0
-
-	/* Restore other callee saved registers. */
-	movq	PCB_R15(%rdi), %r15
-	movq	PCB_R14(%rdi), %r14
-	movq	PCB_R13(%rdi), %r13
-	movq	PCB_R12(%rdi), %r12
-	movq	PCB_RBP(%rdi), %rbp
-	movq	PCB_RSP(%rdi), %rsp
-	movq	PCB_RBX(%rdi), %rbx
-
-	/* Restore return address. */
-	movq	PCB_RIP(%rdi), %rax
-	movq	%rax, (%rsp)
-
-	/* Indicate the CPU is resumed. */
-	xorl	%eax, %eax
-	movl	%eax, WAKEUP_CTX(cpu)
-
-	ret
-END(acpi_restorecpu)
diff --git a/sys/amd64/acpica/acpi_wakecode.S b/sys/amd64/acpica/acpi_wakecode.S
index 82d0ab2..a877328 100644
--- a/sys/amd64/acpica/acpi_wakecode.S
+++ b/sys/amd64/acpica/acpi_wakecode.S
@@ -219,10 +219,15 @@ wakeup_64:
 	mov	$bootdata64 - bootgdt, %eax
 	mov	%ax, %ds
 
-	/* Restore arguments and return. */
-	movq	wakeup_kpml4 - wakeup_start(%rbx), %rdi
-	movq	wakeup_ctx - wakeup_start(%rbx), %rsi
-	movq	wakeup_retaddr - wakeup_start(%rbx), %rax
+	/* Restore arguments. */
+	movq	wakeup_cr3 - wakeup_start(%rbx), %rsi
+	movq	wakeup_pcb - wakeup_start(%rbx), %rdi
+	movq	wakeup_ret - wakeup_start(%rbx), %rax
+
+	/* Restore GDT. */
+	lgdt	wakeup_gdt - wakeup_start(%rbx)
+
+	/* Jump to return address. */
 	jmp	*%rax
 
 	.data
@@ -268,34 +273,15 @@ bootgdtdesc:
 	.long	bootgdt - wakeup_start	/* Offset plus %ds << 4 */
 
 	ALIGN_DATA
-wakeup_retaddr:
+wakeup_cr4:		/* not used */
 	.quad	0
-wakeup_kpml4:
-	.quad	0
-
-wakeup_ctx:
+wakeup_cr3:
 	.quad	0
 wakeup_pcb:
 	.quad	0
-wakeup_fpusave:
+wakeup_ret:
 	.quad	0
 wakeup_gdt:
 	.word	0
 	.quad	0
-
-	ALIGN_DATA
-wakeup_efer:
-	.quad	0
-wakeup_star:
-	.quad	0
-wakeup_lstar:
-	.quad	0
-wakeup_cstar:
-	.quad	0
-wakeup_sfmask:
-	.quad	0
-wakeup_xsmask:
-	.quad	0
-wakeup_cpu:
-	.long	0
 dummy:
diff --git a/sys/amd64/acpica/acpi_wakeup.c b/sys/amd64/acpica/acpi_wakeup.c
deleted file mode 100644
index e669716..0000000
--- a/sys/amd64/acpica/acpi_wakeup.c
+++ /dev/null
@@ -1,424 +0,0 @@
-/*-
- * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org>
- * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org>
- * Copyright (c) 2003 Peter Wemm
- * Copyright (c) 2008-2012 Jung-uk Kim <jkim@FreeBSD.org>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include <sys/param.h>
-#include <sys/bus.h>
-#include <sys/eventhandler.h>
-#include <sys/kernel.h>
-#include <sys/malloc.h>
-#include <sys/memrange.h>
-#include <sys/smp.h>
-
-#include <vm/vm.h>
-#include <vm/pmap.h>
-
-#include <machine/clock.h>
-#include <machine/intr_machdep.h>
-#include <x86/mca.h>
-#include <machine/pcb.h>
-#include <machine/pmap.h>
-#include <machine/specialreg.h>
-#include <machine/md_var.h>
-
-#ifdef SMP
-#include <x86/apicreg.h>
-#include <machine/smp.h>
-#include <machine/vmparam.h>
-#endif
-
-#include <contrib/dev/acpica/include/acpi.h>
-
-#include <dev/acpica/acpivar.h>
-
-#include "acpi_wakecode.h"
-#include "acpi_wakedata.h"
-
-/* Make sure the code is less than a page and leave room for the stack. */
-CTASSERT(sizeof(wakecode) < PAGE_SIZE - 1024);
-
-extern int		acpi_resume_beep;
-extern int		acpi_reset_video;
-
-#ifdef SMP
-extern struct pcb	**susppcbs;
-extern void		**suspfpusave;
-static cpuset_t		suspcpus;
-#else
-static struct pcb	**susppcbs;
-static void		**suspfpusave;
-#endif
-
-int			acpi_restorecpu(uint64_t, vm_offset_t);
-
-static void		*acpi_alloc_wakeup_handler(void);
-static void		acpi_stop_beep(void *);
-
-#ifdef SMP
-static int		acpi_wakeup_ap(struct acpi_softc *, int);
-static void		acpi_wakeup_cpus(struct acpi_softc *);
-#endif
-
-#define	WAKECODE_VADDR(sc)	((sc)->acpi_wakeaddr + (3 * PAGE_SIZE))
-#define	WAKECODE_PADDR(sc)	((sc)->acpi_wakephys + (3 * PAGE_SIZE))
-#define	WAKECODE_FIXUP(offset, type, val) do	{	\
-	type	*addr;					\
-	addr = (type *)(WAKECODE_VADDR(sc) + offset);	\
-	*addr = val;					\
-} while (0)
-
-static void
-acpi_stop_beep(void *arg)
-{
-
-	if (acpi_resume_beep != 0)
-		timer_spkr_release();
-}
-
-#ifdef SMP
-static int
-acpi_wakeup_ap(struct acpi_softc *sc, int cpu)
-{
-	int		vector = (WAKECODE_PADDR(sc) >> 12) & 0xff;
-	int		apic_id = cpu_apic_ids[cpu];
-	int		ms;
-
-	WAKECODE_FIXUP(wakeup_pcb, struct pcb *, susppcbs[cpu]);
-	WAKECODE_FIXUP(wakeup_fpusave, void *, suspfpusave[cpu]);
-	WAKECODE_FIXUP(wakeup_gdt, uint16_t, susppcbs[cpu]->pcb_gdt.rd_limit);
-	WAKECODE_FIXUP(wakeup_gdt + 2, uint64_t,
-	    susppcbs[cpu]->pcb_gdt.rd_base);
-	WAKECODE_FIXUP(wakeup_cpu, int, cpu);
-
-	/* do an INIT IPI: assert RESET */
-	lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE |
-	    APIC_LEVEL_ASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_INIT, apic_id);
-
-	/* wait for pending status end */
-	lapic_ipi_wait(-1);
-
-	/* do an INIT IPI: deassert RESET */
-	lapic_ipi_raw(APIC_DEST_ALLESELF | APIC_TRIGMOD_LEVEL |
-	    APIC_LEVEL_DEASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_INIT, 0);
-
-	/* wait for pending status end */
-	DELAY(10000);		/* wait ~10mS */
-	lapic_ipi_wait(-1);
-
-	/*
-	 * next we do a STARTUP IPI: the previous INIT IPI might still be
-	 * latched, (P5 bug) this 1st STARTUP would then terminate
-	 * immediately, and the previously started INIT IPI would continue. OR
-	 * the previous INIT IPI has already run. and this STARTUP IPI will
-	 * run. OR the previous INIT IPI was ignored. and this STARTUP IPI
-	 * will run.
-	 */
-
-	/* do a STARTUP IPI */
-	lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE |
-	    APIC_LEVEL_DEASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_STARTUP |
-	    vector, apic_id);
-	lapic_ipi_wait(-1);
-	DELAY(200);		/* wait ~200uS */
-
-	/*
-	 * finally we do a 2nd STARTUP IPI: this 2nd STARTUP IPI should run IF
-	 * the previous STARTUP IPI was cancelled by a latched INIT IPI. OR
-	 * this STARTUP IPI will be ignored, as only ONE STARTUP IPI is
-	 * recognized after hardware RESET or INIT IPI.
-	 */
-
-	lapic_ipi_raw(APIC_DEST_DESTFLD | APIC_TRIGMOD_EDGE |
-	    APIC_LEVEL_DEASSERT | APIC_DESTMODE_PHY | APIC_DELMODE_STARTUP |
-	    vector, apic_id);
-	lapic_ipi_wait(-1);
-	DELAY(200);		/* wait ~200uS */
-
-	/* Wait up to 5 seconds for it to start. */
-	for (ms = 0; ms < 5000; ms++) {
-		if (*(int *)(WAKECODE_VADDR(sc) + wakeup_cpu) == 0)
-			return (1);	/* return SUCCESS */
-		DELAY(1000);
-	}
-	return (0);		/* return FAILURE */
-}
-
-#define	WARMBOOT_TARGET		0
-#define	WARMBOOT_OFF		(KERNBASE + 0x0467)
-#define	WARMBOOT_SEG		(KERNBASE + 0x0469)
-
-#define	CMOS_REG		(0x70)
-#define	CMOS_DATA		(0x71)
-#define	BIOS_RESET		(0x0f)
-#define	BIOS_WARM		(0x0a)
-
-static void
-acpi_wakeup_cpus(struct acpi_softc *sc)
-{
-	uint32_t	mpbioswarmvec;
-	int		cpu;
-	u_char		mpbiosreason;
-
-	/* save the current value of the warm-start vector */
-	mpbioswarmvec = *((uint32_t *)WARMBOOT_OFF);
-	outb(CMOS_REG, BIOS_RESET);
-	mpbiosreason = inb(CMOS_DATA);
-
-	/* setup a vector to our boot code */
-	*((volatile u_short *)WARMBOOT_OFF) = WARMBOOT_TARGET;
-	*((volatile u_short *)WARMBOOT_SEG) = WAKECODE_PADDR(sc) >> 4;
-	outb(CMOS_REG, BIOS_RESET);
-	outb(CMOS_DATA, BIOS_WARM);	/* 'warm-start' */
-
-	/* Wake up each AP. */
-	for (cpu = 1; cpu < mp_ncpus; cpu++) {
-		if (!CPU_ISSET(cpu, &suspcpus))
-			continue;
-		if (acpi_wakeup_ap(sc, cpu) == 0) {
-			/* restore the warmstart vector */
-			*(uint32_t *)WARMBOOT_OFF = mpbioswarmvec;
-			panic("acpi_wakeup: failed to resume AP #%d (PHY #%d)",
-			    cpu, cpu_apic_ids[cpu]);
-		}
-	}
-
-	/* restore the warmstart vector */
-	*(uint32_t *)WARMBOOT_OFF = mpbioswarmvec;
-
-	outb(CMOS_REG, BIOS_RESET);
-	outb(CMOS_DATA, mpbiosreason);
-}
-#endif
-
-int
-acpi_sleep_machdep(struct acpi_softc *sc, int state)
-{
-	ACPI_STATUS	status;
-
-	if (sc->acpi_wakeaddr == 0ul)
-		return (-1);	/* couldn't alloc wake memory */
-
-#ifdef SMP
-	suspcpus = all_cpus;
-	CPU_CLR(PCPU_GET(cpuid), &suspcpus);
-#endif
-
-	if (acpi_resume_beep != 0)
-		timer_spkr_acquire();
-
-	AcpiSetFirmwareWakingVector(WAKECODE_PADDR(sc));
-
-	intr_suspend();
-
-	if (savectx(susppcbs[0])) {
-		ctx_fpusave(suspfpusave[0]);
-#ifdef SMP
-		if (!CPU_EMPTY(&suspcpus) && suspend_cpus(suspcpus) == 0) {
-			device_printf(sc->acpi_dev, "Failed to suspend APs\n");
-			return (0);	/* couldn't sleep */
-		}
-#endif
-
-		WAKECODE_FIXUP(resume_beep, uint8_t, (acpi_resume_beep != 0));
-		WAKECODE_FIXUP(reset_video, uint8_t, (acpi_reset_video != 0));
-
-		WAKECODE_FIXUP(wakeup_pcb, struct pcb *, susppcbs[0]);
-		WAKECODE_FIXUP(wakeup_fpusave, void *, suspfpusave[0]);
-		WAKECODE_FIXUP(wakeup_gdt, uint16_t,
-		    susppcbs[0]->pcb_gdt.rd_limit);
-		WAKECODE_FIXUP(wakeup_gdt + 2, uint64_t,
-		    susppcbs[0]->pcb_gdt.rd_base);
-		WAKECODE_FIXUP(wakeup_cpu, int, 0);
-
-		/* Call ACPICA to enter the desired sleep state */
-		if (state == ACPI_STATE_S4 && sc->acpi_s4bios)
-			status = AcpiEnterSleepStateS4bios();
-		else
-			status = AcpiEnterSleepState(state, acpi_sleep_flags);
-		if (ACPI_FAILURE(status)) {
-			device_printf(sc->acpi_dev,
-			    "AcpiEnterSleepState failed - %s\n",
-			    AcpiFormatException(status));
-			return (0);	/* couldn't sleep */
-		}
-
-		for (;;)
-			ia32_pause();
-	}
-
-	return (1);	/* wakeup successfully */
-}
-
-int
-acpi_wakeup_machdep(struct acpi_softc *sc, int state, int sleep_result,
-    int intr_enabled)
-{
-
-	if (sleep_result == -1)
-		return (sleep_result);
-
-	if (!intr_enabled) {
-		/* Wakeup MD procedures in interrupt disabled context */
-		if (sleep_result == 1) {
-			pmap_init_pat();
-			load_cr3(susppcbs[0]->pcb_cr3);
-			initializecpu();
-			PCPU_SET(switchtime, 0);
-			PCPU_SET(switchticks, ticks);
-#ifdef SMP
-			if (!CPU_EMPTY(&suspcpus))
-				acpi_wakeup_cpus(sc);
-#endif
-		}
-
-#ifdef SMP
-		if (!CPU_EMPTY(&suspcpus))
-			restart_cpus(suspcpus);
-#endif
-		mca_resume();
-		intr_resume();
-
-		AcpiSetFirmwareWakingVector(0);
-	} else {
-		/* Wakeup MD procedures in interrupt enabled context */
-		if (sleep_result == 1 && mem_range_softc.mr_op != NULL &&
-		    mem_range_softc.mr_op->reinit != NULL)
-			mem_range_softc.mr_op->reinit(&mem_range_softc);
-	}
-
-	return (sleep_result);
-}
-
-static void *
-acpi_alloc_wakeup_handler(void)
-{
-	void		*wakeaddr;
-	int		i;
-
-	/*
-	 * Specify the region for our wakeup code.  We want it in the low 1 MB
-	 * region, excluding real mode IVT (0-0x3ff), BDA (0x400-0x4ff), EBDA
-	 * (less than 128KB, below 0xa0000, must be excluded by SMAP and DSDT),
-	 * and ROM area (0xa0000 and above).  The temporary page tables must be
-	 * page-aligned.
-	 */
-	wakeaddr = contigmalloc(4 * PAGE_SIZE, M_DEVBUF, M_WAITOK, 0x500,
-	    0xa0000, PAGE_SIZE, 0ul);
-	if (wakeaddr == NULL) {
-		printf("%s: can't alloc wake memory\n", __func__);
-		return (NULL);
-	}
-	if (EVENTHANDLER_REGISTER(power_resume, acpi_stop_beep, NULL,
-	    EVENTHANDLER_PRI_LAST) == NULL) {
-		printf("%s: can't register event handler\n", __func__);
-		contigfree(wakeaddr, 4 * PAGE_SIZE, M_DEVBUF);
-		return (NULL);
-	}
-	susppcbs = malloc(mp_ncpus * sizeof(*susppcbs), M_DEVBUF, M_WAITOK);
-	suspfpusave = malloc(mp_ncpus * sizeof(void *), M_DEVBUF, M_WAITOK);
-	for (i = 0; i < mp_ncpus; i++) {
-		susppcbs[i] = malloc(sizeof(**susppcbs), M_DEVBUF, M_WAITOK);
-		suspfpusave[i] = alloc_fpusave(M_WAITOK);
-	}
-
-	return (wakeaddr);
-}
-
-void
-acpi_install_wakeup_handler(struct acpi_softc *sc)
-{
-	static void	*wakeaddr = NULL;
-	uint64_t	*pt4, *pt3, *pt2;
-	int		i;
-
-	if (wakeaddr != NULL)
-		return;
-
-	wakeaddr = acpi_alloc_wakeup_handler();
-	if (wakeaddr == NULL)
-		return;
-
-	sc->acpi_wakeaddr = (vm_offset_t)wakeaddr;
-	sc->acpi_wakephys = vtophys(wakeaddr);
-
-	bcopy(wakecode, (void *)WAKECODE_VADDR(sc), sizeof(wakecode));
-
-	/* Patch GDT base address, ljmp targets and page table base address. */
-	WAKECODE_FIXUP((bootgdtdesc + 2), uint32_t,
-	    WAKECODE_PADDR(sc) + bootgdt);
-	WAKECODE_FIXUP((wakeup_sw32 + 2), uint32_t,
-	    WAKECODE_PADDR(sc) + wakeup_32);
-	WAKECODE_FIXUP((wakeup_sw64 + 1), uint32_t,
-	    WAKECODE_PADDR(sc) + wakeup_64);
-	WAKECODE_FIXUP(wakeup_pagetables, uint32_t, sc->acpi_wakephys);
-
-	/* Save pointers to some global data. */
-	WAKECODE_FIXUP(wakeup_retaddr, void *, acpi_restorecpu);
-	WAKECODE_FIXUP(wakeup_kpml4, uint64_t, KPML4phys);
-	WAKECODE_FIXUP(wakeup_ctx, vm_offset_t,
-	    WAKECODE_VADDR(sc) + wakeup_ctx);
-	WAKECODE_FIXUP(wakeup_efer, uint64_t, rdmsr(MSR_EFER));
-	WAKECODE_FIXUP(wakeup_star, uint64_t, rdmsr(MSR_STAR));
-	WAKECODE_FIXUP(wakeup_lstar, uint64_t, rdmsr(MSR_LSTAR));
-	WAKECODE_FIXUP(wakeup_cstar, uint64_t, rdmsr(MSR_CSTAR));
-	WAKECODE_FIXUP(wakeup_sfmask, uint64_t, rdmsr(MSR_SF_MASK));
-	WAKECODE_FIXUP(wakeup_xsmask, uint64_t, xsave_mask);
-
-	/* Build temporary page tables below realmode code. */
-	pt4 = wakeaddr;
-	pt3 = pt4 + (PAGE_SIZE) / sizeof(uint64_t);
-	pt2 = pt3 + (PAGE_SIZE) / sizeof(uint64_t);
-
-	/* Create the initial 1GB replicated page tables */
-	for (i = 0; i < 512; i++) {
-		/*
-		 * Each slot of the level 4 pages points
-		 * to the same level 3 page
-		 */
-		pt4[i] = (uint64_t)(sc->acpi_wakephys + PAGE_SIZE);
-		pt4[i] |= PG_V | PG_RW | PG_U;
-
-		/*
-		 * Each slot of the level 3 pages points
-		 * to the same level 2 page
-		 */
-		pt3[i] = (uint64_t)(sc->acpi_wakephys + (2 * PAGE_SIZE));
-		pt3[i] |= PG_V | PG_RW | PG_U;
-
-		/* The level 2 page slots are mapped with 2MB pages for 1GB. */
-		pt2[i] = i * (2 * 1024 * 1024);
-		pt2[i] |= PG_V | PG_RW | PG_PS | PG_U;
-	}
-
-	if (bootverbose)
-		device_printf(sc->acpi_dev, "wakeup code va %p pa %p\n",
-		    (void *)sc->acpi_wakeaddr, (void *)sc->acpi_wakephys);
-}
diff --git a/sys/amd64/amd64/cpu_switch.S b/sys/amd64/amd64/cpu_switch.S
index aff9d17..240c955 100644
--- a/sys/amd64/amd64/cpu_switch.S
+++ b/sys/amd64/amd64/cpu_switch.S
@@ -357,6 +357,30 @@ ENTRY(savectx)
 	rdmsr
 	movl	%eax,PCB_KGSBASE(%rdi)
 	movl	%edx,PCB_KGSBASE+4(%rdi)
+	movl	$MSR_EFER,%ecx
+	rdmsr
+	movl	%eax,PCB_EFER(%rdi)
+	movl	%edx,PCB_EFER+4(%rdi)
+	movl	$MSR_STAR,%ecx
+	rdmsr
+	movl	%eax,PCB_STAR(%rdi)
+	movl	%edx,PCB_STAR+4(%rdi)
+	movl	$MSR_LSTAR,%ecx
+	rdmsr
+	movl	%eax,PCB_LSTAR(%rdi)
+	movl	%edx,PCB_LSTAR+4(%rdi)
+	movl	$MSR_CSTAR,%ecx
+	rdmsr
+	movl	%eax,PCB_CSTAR(%rdi)
+	movl	%edx,PCB_CSTAR+4(%rdi)
+	movl	$MSR_SF_MASK,%ecx
+	rdmsr
+	movl	%eax,PCB_SFMASK(%rdi)
+	movl	%edx,PCB_SFMASK+4(%rdi)
+	movl	xsave_mask,%eax
+	movl	%eax,PCB_XSMASK(%rdi)
+	movl	xsave_mask+4,%eax
+	movl	%eax,PCB_XSMASK+4(%rdi)
 
 	sgdt	PCB_GDT(%rdi)
 	sidt	PCB_IDT(%rdi)
@@ -370,6 +394,141 @@ ENTRY(savectx)
 END(savectx)
 
 /*
+ * resumectx(pcb in %rdi, cr3 in %rsi)
+ * Resuming processor state from pcb.
+ */     
+ENTRY(resumectx)
+	/* Switch to KPML4phys. */
+	movq	%rsi,%cr3
+
+	/* Force kernel segment registers. */
+	movl	$KDSEL,%eax
+	movw	%ax,%ds
+	movw	%ax,%es
+	movw	%ax,%ss
+	movl	$KUF32SEL,%eax
+	movw	%ax,%fs
+	movl	$KUG32SEL,%eax
+	movw	%ax,%gs
+
+	movl	$MSR_FSBASE,%ecx
+	movl	PCB_FSBASE(%rdi),%eax
+	movl	4 + PCB_FSBASE(%rdi),%edx
+	wrmsr
+	movl	$MSR_GSBASE,%ecx
+	movl	PCB_GSBASE(%rdi),%eax
+	movl	4 + PCB_GSBASE(%rdi),%edx
+	wrmsr
+	movl	$MSR_KGSBASE,%ecx
+	movl	PCB_KGSBASE(%rdi),%eax
+	movl	4 + PCB_KGSBASE(%rdi),%edx
+	wrmsr
+
+	/* Restore EFER. */
+	movl	$MSR_EFER,%ecx
+	movl	PCB_EFER(%rdi),%eax
+	wrmsr
+
+	/* Restore fast syscall stuff. */
+	movl	$MSR_STAR,%ecx
+	movl	PCB_STAR(%rdi),%eax
+	movl	4 + PCB_STAR(%rdi),%edx
+	wrmsr
+	movl	$MSR_LSTAR,%ecx
+	movl	PCB_LSTAR(%rdi),%eax
+	movl	4 + PCB_LSTAR(%rdi),%edx
+	wrmsr
+	movl	$MSR_CSTAR,%ecx
+	movl	PCB_CSTAR(%rdi),%eax
+	movl	4 + PCB_CSTAR(%rdi),%edx
+	wrmsr
+	movl	$MSR_SF_MASK,%ecx
+	movl	PCB_SFMASK(%rdi),%eax
+	wrmsr
+
+	/* Restore CR0 except for FPU mode. */
+	movq	PCB_CR0(%rdi),%rax
+	andq	$~(CR0_EM | CR0_TS),%rax
+	movq	%rax,%cr0
+
+	/* Restore CR2, CR4 and CR3. */
+	movq	PCB_CR2(%rdi),%rax
+	movq	%rax,%cr2
+	movq	PCB_CR4(%rdi),%rax
+	movq	%rax,%cr4
+	movq	PCB_CR3(%rdi),%rax
+	movq	%rax,%cr3
+
+	/* Restore descriptor tables. */
+	lidt	PCB_IDT(%rdi)
+	lldt	PCB_LDT(%rdi)
+
+#define	SDT_SYSTSS	9
+#define	SDT_SYSBSY	11
+
+	/* Clear "task busy" bit and reload TR. */
+	movq	PCPU(TSS),%rax
+	andb	$(~SDT_SYSBSY | SDT_SYSTSS),5(%rax)
+	movw	PCB_TR(%rdi),%ax
+	ltr	%ax
+
+#undef	SDT_SYSTSS
+#undef	SDT_SYSBSY
+
+	/* Restore debug registers. */
+	movq	PCB_DR0(%rdi),%rax
+	movq	%rax,%dr0
+	movq	PCB_DR1(%rdi),%rax
+	movq	%rax,%dr1
+	movq	PCB_DR2(%rdi),%rax
+	movq	%rax,%dr2
+	movq	PCB_DR3(%rdi),%rax
+	movq	%rax,%dr3
+	movq	PCB_DR6(%rdi),%rax
+	movq	%rax,%dr6
+	movq	PCB_DR7(%rdi),%rax
+	movq	%rax,%dr7
+
+	/* Restore FPU state. */
+	fninit
+	movq	PCB_FPUSUSPEND(%rdi),%rbx
+	movq	PCB_XSMASK(%rdi),%rax
+	testq	%rax,%rax
+	jz	1f
+	movq	%rax,%rdx
+	shrq	$32,%rdx
+	movl	$XCR0,%ecx
+/*	xsetbv	*/
+	.byte	0x0f, 0x01, 0xd1
+/*	xrstor	(%rbx) */
+	.byte	0x0f, 0xae, 0x2b
+	jmp	2f
+1:
+	fxrstor	(%rbx)
+2:
+
+	/* Reload CR0. */
+	movq	PCB_CR0(%rdi),%rax
+	movq	%rax,%cr0
+
+	/* Restore other callee saved registers. */
+	movq	PCB_R15(%rdi),%r15
+	movq	PCB_R14(%rdi),%r14
+	movq	PCB_R13(%rdi),%r13
+	movq	PCB_R12(%rdi),%r12
+	movq	PCB_RBP(%rdi),%rbp
+	movq	PCB_RSP(%rdi),%rsp
+	movq	PCB_RBX(%rdi),%rbx
+
+	/* Restore return address. */
+	movq	PCB_RIP(%rdi),%rax
+	movq	%rax,(%rsp)
+
+	xorl	%eax,%eax
+	ret
+END(resumectx)
+
+/*
  * Wrapper around fpusave to care about TS0_CR.
  */
 ENTRY(ctx_fpusave)
diff --git a/sys/amd64/amd64/genassym.c b/sys/amd64/amd64/genassym.c
index 3796aa8..174927a 100644
--- a/sys/amd64/amd64/genassym.c
+++ b/sys/amd64/amd64/genassym.c
@@ -157,6 +157,13 @@ ASSYM(PCB_TSSP, offsetof(struct pcb, pcb_tssp));
 ASSYM(PCB_SAVEFPU, offsetof(struct pcb, pcb_save));
 ASSYM(PCB_SAVEFPU_SIZE, sizeof(struct savefpu));
 ASSYM(PCB_USERFPU, sizeof(struct pcb));
+ASSYM(PCB_EFER, offsetof(struct pcb, pcb_efer));
+ASSYM(PCB_STAR, offsetof(struct pcb, pcb_star));
+ASSYM(PCB_LSTAR, offsetof(struct pcb, pcb_lstar));
+ASSYM(PCB_CSTAR, offsetof(struct pcb, pcb_cstar));
+ASSYM(PCB_SFMASK, offsetof(struct pcb, pcb_sfmask));
+ASSYM(PCB_XSMASK, offsetof(struct pcb, pcb_xsmask));
+ASSYM(PCB_FPUSUSPEND, offsetof(struct pcb, pcb_fpususpend));
 ASSYM(PCB_SIZE, sizeof(struct pcb));
 ASSYM(PCB_FULL_IRET, PCB_FULL_IRET);
 ASSYM(PCB_DBREGS, PCB_DBREGS);
diff --git a/sys/amd64/amd64/mp_machdep.c b/sys/amd64/amd64/mp_machdep.c
index 3d07f24..903163e 100644
--- a/sys/amd64/amd64/mp_machdep.c
+++ b/sys/amd64/amd64/mp_machdep.c
@@ -100,7 +100,6 @@ void *dpcpu;
 
 struct pcb stoppcbs[MAXCPU];
 struct pcb **susppcbs;
-void **suspfpusave;
 
 /* Variables needed for SMP tlb shootdown. */
 vm_offset_t smp_tlb_addr1;
@@ -1415,15 +1414,19 @@ cpususpend_handler(void)
 	cpu = PCPU_GET(cpuid);
 
 	if (savectx(susppcbs[cpu])) {
-		ctx_fpusave(suspfpusave[cpu]);
+		ctx_fpusave(susppcbs[cpu]->pcb_fpususpend);
 		wbinvd();
 		CPU_SET_ATOMIC(cpu, &stopped_cpus);
+		CPU_SET_ATOMIC(cpu, &suspended_cpus);
 	} else {
 		pmap_init_pat();
+#if 0
 		load_cr3(susppcbs[cpu]->pcb_cr3);
+#endif
 		initializecpu();
 		PCPU_SET(switchtime, 0);
 		PCPU_SET(switchticks, ticks);
+		CPU_CLR_ATOMIC(cpu, &suspended_cpus);
 	}
 
 	/* Wait for resume */
diff --git a/sys/amd64/include/pcb.h b/sys/amd64/include/pcb.h
index 70b2e62..619fba5 100644
--- a/sys/amd64/include/pcb.h
+++ b/sys/amd64/include/pcb.h
@@ -91,9 +91,20 @@ struct pcb {
 	/* local tss, with i/o bitmap; NULL for common */
 	struct amd64tss *pcb_tssp;
 
+	/* model specific registers */
+	register_t	pcb_efer;
+	register_t	pcb_star;
+	register_t	pcb_lstar;
+	register_t	pcb_cstar;
+	register_t	pcb_sfmask;
+	register_t	pcb_xsmask;
+
+	/* fpu context for suspend/resume */
+	void *		pcb_fpususpend;
+
 	struct savefpu	*pcb_save;
 
-	uint64_t	pcb_pad[2];
+	uint64_t	pcb_pad[3];
 };
 
 #ifdef _KERNEL
@@ -131,6 +142,7 @@ clear_pcb_flags(struct pcb *pcb, const u_int flags)
 
 void	makectx(struct trapframe *, struct pcb *);
 int	savectx(struct pcb *) __returns_twice;
+void	resumectx(struct pcb *);
 
 #endif