acpi_wakeup_low.S revision 1.6
1 /* $NetBSD: acpi_wakeup_low.S,v 1.6 2017/09/23 10:18:49 maxv Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 Joerg Sonnenberger <joerg (at) netbsd.org> 5 * Copyright (c) 2001 Takanori Watanabe <takawata (at) jp.freebsd.org> 6 * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki (at) jp.freebsd.org> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include "assym.h" 32 #include <machine/asm.h> 33 #include <machine/segments.h> 34 #include <machine/specialreg.h> 35 36 .text 37 .p2align 2, 0x90 38 .globl acpi_md_sleep_exit 39 acpi_md_sleep_exit: 40 lgdt ACPI_SUSPEND_GDT(%r8) 41 42 /* Reload fixed descriptors for new GDT */ 43 movw $GSEL(GDATA_SEL, SEL_KPL),%ax 44 movw %ax,%ds 45 movw %ax,%es 46 movw %ax,%ss 47 48 /* FS and GS are driven by MSRs, so use NULL for them */ 49 xorw %ax,%ax 50 movw %ax,%fs 51 movw %ax,%gs 52 53 movl $MSR_EFER,%ecx 54 movl ACPI_SUSPEND_EFER(%r8),%eax 55 movl $0,%edx 56 wrmsr 57 58 movl $MSR_FSBASE,%ecx 59 movl ACPI_SUSPEND_FS(%r8),%eax 60 movl ACPI_SUSPEND_FS+4(%r8),%edx 61 wrmsr 62 63 movl $MSR_GSBASE,%ecx 64 movl ACPI_SUSPEND_GS(%r8),%eax 65 movl ACPI_SUSPEND_GS+4(%r8),%edx 66 wrmsr 67 68 movl $MSR_KERNELGSBASE,%ecx 69 movl ACPI_SUSPEND_KGS(%r8),%eax 70 movl ACPI_SUSPEND_KGS+4(%r8),%edx 71 wrmsr 72 73 movq ACPI_SUSPEND_CR8(%r8),%rax 74 movq %rax,%cr8 75 movq ACPI_SUSPEND_CR4(%r8),%rax 76 movq %rax,%cr4 77 movq ACPI_SUSPEND_CR3(%r8),%rax 78 movq %rax,%cr3 79 movq ACPI_SUSPEND_CR2(%r8),%rax 80 movq %rax,%cr2 81 movq ACPI_SUSPEND_CR0(%r8),%rax 82 movq %rax,%cr0 83 84 jmp 1f 85 1: 86 87 movq CPUVAR(GDT),%rax 88 movzwq ACPI_SUSPEND_TR(%r8),%rdx 89 andq $~0x0200,4(%rax,%rdx, 1) 90 91 ltr %dx 92 lldt ACPI_SUSPEND_LDT(%r8) 93 lidt ACPI_SUSPEND_IDT(%r8) 94 95 movq ACPI_SUSPEND_REG+(0*8)(%r8),%rsp 96 movq ACPI_SUSPEND_REG+(1*8)(%r8),%rbx 97 movq ACPI_SUSPEND_REG+(2*8)(%r8),%rbp 98 movq ACPI_SUSPEND_REG+(3*8)(%r8),%r12 99 movq ACPI_SUSPEND_REG+(4*8)(%r8),%r13 100 movq ACPI_SUSPEND_REG+(5*8)(%r8),%r14 101 movq ACPI_SUSPEND_REG+(6*8)(%r8),%r15 102 103 xorq %rax,%rax 104 105 pushq ACPI_SUSPEND_REG+(7*8)(%r8) 106 popfq 107 ret 108 109 .p2align 2, 0x90 110 .type acpi_md_sleep_prepare, @function 111 .globl acpi_md_sleep_prepare 112 acpi_md_sleep_prepare: 113 movq CPUVAR(SELF),%r8 114 movq %rbx,ACPI_SUSPEND_REG+(1*8)(%r8) 115 movq %rbp,ACPI_SUSPEND_REG+(2*8)(%r8) 116 movq %r12,ACPI_SUSPEND_REG+(3*8)(%r8) 117 movq %r13,ACPI_SUSPEND_REG+(4*8)(%r8) 118 movq %r14,ACPI_SUSPEND_REG+(5*8)(%r8) 119 movq %r15,ACPI_SUSPEND_REG+(6*8)(%r8) 120 121 movq %cr0,%rax 122 movq %rax,ACPI_SUSPEND_CR0(%r8) 123 movq %cr2,%rax 124 movq %rax,ACPI_SUSPEND_CR2(%r8) 125 movq %cr3,%rax 126 movq %rax,ACPI_SUSPEND_CR3(%r8) 127 movq %cr4,%rax 128 movq %rax,ACPI_SUSPEND_CR4(%r8) 129 movq %cr8,%rax 130 movq %rax,ACPI_SUSPEND_CR8(%r8) 131 132 pushfq 133 popq ACPI_SUSPEND_REG+(7*8)(%r8) 134 135 movq %rsp,ACPI_SUSPEND_REG+(0*8)(%r8) 136 137 movl $MSR_FSBASE,%ecx 138 rdmsr 139 movl %eax,ACPI_SUSPEND_FS(%r8) 140 movl %edx,ACPI_SUSPEND_FS+4(%r8) 141 142 movl $MSR_GSBASE,%ecx 143 rdmsr 144 movl %eax,ACPI_SUSPEND_GS(%r8) 145 movl %edx,ACPI_SUSPEND_GS+4(%r8) 146 147 movl $MSR_KERNELGSBASE,%ecx 148 rdmsr 149 movl %eax,ACPI_SUSPEND_KGS(%r8) 150 movl %edx,ACPI_SUSPEND_KGS+4(%r8) 151 152 movl $MSR_EFER,%ecx 153 rdmsr 154 movl %eax,ACPI_SUSPEND_EFER(%r8) 155 156 sgdt ACPI_SUSPEND_GDT(%r8) 157 sidt ACPI_SUSPEND_IDT(%r8) 158 sldt ACPI_SUSPEND_LDT(%r8) 159 str ACPI_SUSPEND_TR(%r8) 160 161 call acpi_md_sleep_enter 162 /* acpi_md_sleep_enter only returns on failure. */ 163 movl $-1,%eax 164 ret 165
Indexes created Tue Sep 30 11:09:46 GMT 2025