acpi_wakeup_low.S revision 1.9
1 /* $NetBSD: acpi_wakeup_low.S,v 1.9 2017/11/01 09:47:53 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 38 .p2align 2, 0x90 39 NENTRY(acpi_md_sleep_exit) 40 lgdt ACPI_SUSPEND_GDT(%r8) 41 42 /* Reload fixed descriptors for new GDT */ 43 movw $GSEL(GUDATA_SEL, SEL_UPL),%ax 44 movw %ax,%ds 45 movw %ax,%es 46 movw $GSEL(GDATA_SEL, SEL_KPL),%ax 47 movw %ax,%ss 48 49 /* 50 * FS and GS are driven by MSRs, so use NULL for them. If we're 51 * returning to a 32bit LWP, %fs/%gs will be restored in 52 * INTRFASTEXIT. 53 */ 54 xorw %ax,%ax 55 movw %ax,%fs 56 movw %ax,%gs 57 58 movl $MSR_EFER,%ecx 59 movl ACPI_SUSPEND_EFER(%r8),%eax 60 movl $0,%edx 61 wrmsr 62 63 movl $MSR_FSBASE,%ecx 64 movl ACPI_SUSPEND_FS(%r8),%eax 65 movl ACPI_SUSPEND_FS+4(%r8),%edx 66 wrmsr 67 68 movl $MSR_GSBASE,%ecx 69 movl ACPI_SUSPEND_GS(%r8),%eax 70 movl ACPI_SUSPEND_GS+4(%r8),%edx 71 wrmsr 72 73 movl $MSR_KERNELGSBASE,%ecx 74 movl ACPI_SUSPEND_KGS(%r8),%eax 75 movl ACPI_SUSPEND_KGS+4(%r8),%edx 76 wrmsr 77 78 movq ACPI_SUSPEND_CR8(%r8),%rax 79 movq %rax,%cr8 80 movq ACPI_SUSPEND_CR4(%r8),%rax 81 movq %rax,%cr4 82 movq ACPI_SUSPEND_CR3(%r8),%rax 83 movq %rax,%cr3 84 movq ACPI_SUSPEND_CR2(%r8),%rax 85 movq %rax,%cr2 86 movq ACPI_SUSPEND_CR0(%r8),%rax 87 movq %rax,%cr0 88 89 jmp 1f 90 1: 91 92 movq CPUVAR(GDT),%rax 93 movzwq ACPI_SUSPEND_TR(%r8),%rdx 94 andq $~0x0200,4(%rax,%rdx, 1) 95 96 ltr %dx 97 lldt ACPI_SUSPEND_LDT(%r8) 98 lidt ACPI_SUSPEND_IDT(%r8) 99 100 movq ACPI_SUSPEND_REG+(0*8)(%r8),%rsp 101 movq ACPI_SUSPEND_REG+(1*8)(%r8),%rbx 102 movq ACPI_SUSPEND_REG+(2*8)(%r8),%rbp 103 movq ACPI_SUSPEND_REG+(3*8)(%r8),%r12 104 movq ACPI_SUSPEND_REG+(4*8)(%r8),%r13 105 movq ACPI_SUSPEND_REG+(5*8)(%r8),%r14 106 movq ACPI_SUSPEND_REG+(6*8)(%r8),%r15 107 108 xorq %rax,%rax 109 110 pushq ACPI_SUSPEND_REG+(7*8)(%r8) 111 popfq 112 ret 113 END(acpi_md_sleep_exit) 114 115 .p2align 2, 0x90 116 NENTRY(acpi_md_sleep_prepare) 117 movq CPUVAR(SELF),%r8 118 movq %rbx,ACPI_SUSPEND_REG+(1*8)(%r8) 119 movq %rbp,ACPI_SUSPEND_REG+(2*8)(%r8) 120 movq %r12,ACPI_SUSPEND_REG+(3*8)(%r8) 121 movq %r13,ACPI_SUSPEND_REG+(4*8)(%r8) 122 movq %r14,ACPI_SUSPEND_REG+(5*8)(%r8) 123 movq %r15,ACPI_SUSPEND_REG+(6*8)(%r8) 124 125 movq %cr0,%rax 126 movq %rax,ACPI_SUSPEND_CR0(%r8) 127 movq %cr2,%rax 128 movq %rax,ACPI_SUSPEND_CR2(%r8) 129 movq %cr3,%rax 130 movq %rax,ACPI_SUSPEND_CR3(%r8) 131 movq %cr4,%rax 132 movq %rax,ACPI_SUSPEND_CR4(%r8) 133 movq %cr8,%rax 134 movq %rax,ACPI_SUSPEND_CR8(%r8) 135 136 pushfq 137 popq ACPI_SUSPEND_REG+(7*8)(%r8) 138 139 movq %rsp,ACPI_SUSPEND_REG+(0*8)(%r8) 140 141 movl $MSR_FSBASE,%ecx 142 rdmsr 143 movl %eax,ACPI_SUSPEND_FS(%r8) 144 movl %edx,ACPI_SUSPEND_FS+4(%r8) 145 146 movl $MSR_GSBASE,%ecx 147 rdmsr 148 movl %eax,ACPI_SUSPEND_GS(%r8) 149 movl %edx,ACPI_SUSPEND_GS+4(%r8) 150 151 movl $MSR_KERNELGSBASE,%ecx 152 rdmsr 153 movl %eax,ACPI_SUSPEND_KGS(%r8) 154 movl %edx,ACPI_SUSPEND_KGS+4(%r8) 155 156 movl $MSR_EFER,%ecx 157 rdmsr 158 movl %eax,ACPI_SUSPEND_EFER(%r8) 159 160 sgdt ACPI_SUSPEND_GDT(%r8) 161 sidt ACPI_SUSPEND_IDT(%r8) 162 sldt ACPI_SUSPEND_LDT(%r8) 163 str ACPI_SUSPEND_TR(%r8) 164 165 call acpi_md_sleep_enter 166 /* acpi_md_sleep_enter only returns on failure. */ 167 movl $-1,%eax 168 ret 169 END(acpi_md_sleep_prepare) 170
Indexes created Tue Sep 30 11:09:46 GMT 2025