/*      $NetBSD: acpi_wakeup_low.S,v 1.8 2016/08/06 14:54:25 maxv Exp $ */

/*-
 * Copyright (c) 2007 Joerg Sonnenberger <joerg@netbsd.org>
 * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org>
 * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.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 <machine/asm.h>
__KERNEL_RCSID(0, "$NetBSD: acpi_wakeup_low.S,v 1.8 2016/08/06 14:54:25 maxv Exp $");

#include "assym.h"
#include <machine/segments.h>
#include <machine/specialreg.h>

        .text
        .p2align 2, 0x90
        .globl acpi_md_sleep_exit
acpi_md_sleep_exit:
        lgdt    ACPI_SUSPEND_GDT(%edx)

        /* Reload fixed descriptors for new GDT */
        movw    $GSEL(GDATA_SEL, SEL_KPL),%ax
        movw    %ax,%ds
        movw    %ax,%es
        movw    %ax,%ss

        movw    ACPI_SUSPEND_FS(%edx),%ax
        movw    %ax,%fs
        movw    ACPI_SUSPEND_GS(%edx),%ax
        movw    %ax,%gs

        movl    $MSR_EFER,%ecx
        movl    ACPI_SUSPEND_EFER(%edx),%eax
        movl    %edx,%esi
        movl    $0,%edx
        wrmsr
        movl    %esi,%edx

        movl    ACPI_SUSPEND_CR2(%edx),%eax
        movl    %eax,%cr2
        movl    ACPI_SUSPEND_CR4(%edx),%eax
        movl    %eax,%cr4
        movl    ACPI_SUSPEND_CR3(%edx),%eax
        movl    %eax,%cr3

        jmp     1f
1:

        lidt    ACPI_SUSPEND_IDT(%edx)
        lldt    ACPI_SUSPEND_LDT(%edx)

        movl    CPUVAR(GDT),%eax
        movzwl  ACPI_SUSPEND_TR(%edx),%ecx
        andl    $~0x0200,4(%eax,%ecx, 1)
        ltr     %cx

        movl    ACPI_SUSPEND_REG+(0*4)(%edx),%ebx
        movl    ACPI_SUSPEND_REG+(1*4)(%edx),%esi
        movl    ACPI_SUSPEND_REG+(2*4)(%edx),%edi
        movl    ACPI_SUSPEND_REG+(3*4)(%edx),%ebp
        movl    ACPI_SUSPEND_REG+(4*4)(%edx),%esp

        pushl   ACPI_SUSPEND_REG+(5*4)(%edx)
        popfl

        xorl    %eax,%eax

        ret

        .p2align 2, 0x90
        .type acpi_md_sleep_prepare, @function
        .globl acpi_md_sleep_prepare
acpi_md_sleep_prepare:
        movl    CPUVAR(SELF),%edx
        movw    %fs,ACPI_SUSPEND_FS(%edx)
        movw    %gs,ACPI_SUSPEND_GS(%edx)

        movl    %ebx,ACPI_SUSPEND_REG+(0*4)(%edx)
        movl    %esi,ACPI_SUSPEND_REG+(1*4)(%edx)
        movl    %edi,ACPI_SUSPEND_REG+(2*4)(%edx)
        movl    %ebp,ACPI_SUSPEND_REG+(3*4)(%edx)
        movl    %esp,ACPI_SUSPEND_REG+(4*4)(%edx)

        movl    $MSR_EFER,%ecx
        pushl   %edx
        rdmsr   /* overwrites %edx */
        popl    %edx
        movl    %eax,ACPI_SUSPEND_EFER(%edx)

        movl    %cr0,%eax
        movl    %eax,ACPI_SUSPEND_CR0(%edx)
        movl    %cr2,%eax
        movl    %eax,ACPI_SUSPEND_CR2(%edx)
        movl    %cr3,%eax
        movl    %eax,ACPI_SUSPEND_CR3(%edx)
        movl    %cr4,%eax
        movl    %eax,ACPI_SUSPEND_CR4(%edx)

        pushfl
        popl    ACPI_SUSPEND_REG+(5*4)(%edx)

        sgdt    ACPI_SUSPEND_GDT(%edx)
        sidt    ACPI_SUSPEND_IDT(%edx)
        sldt    ACPI_SUSPEND_LDT(%edx)
        str     ACPI_SUSPEND_TR(%edx)

        movl    4(%esp),%eax
        pushl   %eax
        call    acpi_md_sleep_enter
        /* acpi_md_sleep_enter only returns on failure. */
        popl    %eax
        movl    $-1,%eax
        ret