/*      $NetBSD: acpi_wakeup_low.S,v 1.10 2018/07/14 14:29:40 maxv Exp $        */

/*
* Copyright (c) 2007 Joerg Sonnenberger <[email protected]>
* Copyright (c) 2001 Takanori Watanabe <[email protected]>
* Copyright (c) 2001 Mitsuru IWASAKI <[email protected]>
* 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 "assym.h"
#include <machine/asm.h>
#include <machine/segments.h>
#include <machine/specialreg.h>

       .text

       .p2align 2, 0x90
ENTRY(acpi_md_sleep_exit)
       lgdt    ACPI_SUSPEND_GDT(%r8)

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

       /*
        * FS and GS are driven by MSRs, so use NULL for them. If we're
        * returning to a 32bit LWP, %fs/%gs will be restored in
        * INTRFASTEXIT.
        */
       xorw    %ax,%ax
       movw    %ax,%fs
       movw    %ax,%gs

       movl    $MSR_EFER,%ecx
       movl    ACPI_SUSPEND_EFER(%r8),%eax
       movl    $0,%edx
       wrmsr

       movl    $MSR_FSBASE,%ecx
       movl    ACPI_SUSPEND_FS(%r8),%eax
       movl    ACPI_SUSPEND_FS+4(%r8),%edx
       wrmsr

       movl    $MSR_GSBASE,%ecx
       movl    ACPI_SUSPEND_GS(%r8),%eax
       movl    ACPI_SUSPEND_GS+4(%r8),%edx
       wrmsr

       movl    $MSR_KERNELGSBASE,%ecx
       movl    ACPI_SUSPEND_KGS(%r8),%eax
       movl    ACPI_SUSPEND_KGS+4(%r8),%edx
       wrmsr

       movq    ACPI_SUSPEND_CR8(%r8),%rax
       movq    %rax,%cr8
       movq    ACPI_SUSPEND_CR4(%r8),%rax
       movq    %rax,%cr4
       movq    ACPI_SUSPEND_CR3(%r8),%rax
       movq    %rax,%cr3
       movq    ACPI_SUSPEND_CR2(%r8),%rax
       movq    %rax,%cr2
       movq    ACPI_SUSPEND_CR0(%r8),%rax
       movq    %rax,%cr0

       jmp     1f
1:

       movq    CPUVAR(GDT),%rax
       movzwq  ACPI_SUSPEND_TR(%r8),%rdx
       andq    $~0x0200,4(%rax,%rdx, 1)

       ltr     %dx
       lldt    ACPI_SUSPEND_LDT(%r8)
       lidt    ACPI_SUSPEND_IDT(%r8)

       movq    ACPI_SUSPEND_REG+(0*8)(%r8),%rsp
       movq    ACPI_SUSPEND_REG+(1*8)(%r8),%rbx
       movq    ACPI_SUSPEND_REG+(2*8)(%r8),%rbp
       movq    ACPI_SUSPEND_REG+(3*8)(%r8),%r12
       movq    ACPI_SUSPEND_REG+(4*8)(%r8),%r13
       movq    ACPI_SUSPEND_REG+(5*8)(%r8),%r14
       movq    ACPI_SUSPEND_REG+(6*8)(%r8),%r15

       xorq    %rax,%rax

       pushq   ACPI_SUSPEND_REG+(7*8)(%r8)
       popfq
       ret
END(acpi_md_sleep_exit)

       .p2align 2, 0x90
ENTRY(acpi_md_sleep_prepare)
       movq    CPUVAR(SELF),%r8
       movq    %rbx,ACPI_SUSPEND_REG+(1*8)(%r8)
       movq    %rbp,ACPI_SUSPEND_REG+(2*8)(%r8)
       movq    %r12,ACPI_SUSPEND_REG+(3*8)(%r8)
       movq    %r13,ACPI_SUSPEND_REG+(4*8)(%r8)
       movq    %r14,ACPI_SUSPEND_REG+(5*8)(%r8)
       movq    %r15,ACPI_SUSPEND_REG+(6*8)(%r8)

       movq    %cr0,%rax
       movq    %rax,ACPI_SUSPEND_CR0(%r8)
       movq    %cr2,%rax
       movq    %rax,ACPI_SUSPEND_CR2(%r8)
       movq    %cr3,%rax
       movq    %rax,ACPI_SUSPEND_CR3(%r8)
       movq    %cr4,%rax
       movq    %rax,ACPI_SUSPEND_CR4(%r8)
       movq    %cr8,%rax
       movq    %rax,ACPI_SUSPEND_CR8(%r8)

       pushfq
       popq    ACPI_SUSPEND_REG+(7*8)(%r8)

       movq    %rsp,ACPI_SUSPEND_REG+(0*8)(%r8)

       movl    $MSR_FSBASE,%ecx
       rdmsr
       movl    %eax,ACPI_SUSPEND_FS(%r8)
       movl    %edx,ACPI_SUSPEND_FS+4(%r8)

       movl    $MSR_GSBASE,%ecx
       rdmsr
       movl    %eax,ACPI_SUSPEND_GS(%r8)
       movl    %edx,ACPI_SUSPEND_GS+4(%r8)

       movl    $MSR_KERNELGSBASE,%ecx
       rdmsr
       movl    %eax,ACPI_SUSPEND_KGS(%r8)
       movl    %edx,ACPI_SUSPEND_KGS+4(%r8)

       movl    $MSR_EFER,%ecx
       rdmsr
       movl    %eax,ACPI_SUSPEND_EFER(%r8)

       sgdt    ACPI_SUSPEND_GDT(%r8)
       sidt    ACPI_SUSPEND_IDT(%r8)
       sldt    ACPI_SUSPEND_LDT(%r8)
       str     ACPI_SUSPEND_TR(%r8)

       call    acpi_md_sleep_enter
       /* acpi_md_sleep_enter only returns on failure. */
       movl    $-1,%eax
       ret
END(acpi_md_sleep_prepare)

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