acpi_wakecode.S revision 1.1.2.7
1 /* $NetBSD: acpi_wakecode.S,v 1.1.2.7 2007/09/25 23:29:40 joerg Exp $ */ 2 3 /*- 4 * Copyright (c) 2002 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Takuya SHIOZAKI. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 40 /* 41 * This code is derived from FreeBSD. Original copyrights: 42 * 43 * Copyright (c) 2001 Takanori Watanabe <takawata (at) jp.freebsd.org> 44 * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki (at) jp.freebsd.org> 45 * All rights reserved. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 * 68 * FreeBSD: src/sys/i386/acpica/acpi_wakecode.S,v 1.1 2001/07/20 06:07:31 takawata Exp 69 */ 70 71 #define _LOCORE 72 73 #include <machine/psl.h> 74 #include <machine/specialreg.h> 75 #include <machine/segments.h> 76 77 #define ACPI_WAKEUP_ADDR 0x3000 78 79 .text 80 .code16 81 .org 0 /* ACPI spec says: cs==(phys>>8), ip==(phys&0x000F) */ 82 .globl wakeup_16 83 wakeup_16: 84 nop 85 cli 86 cld 87 88 /* Set up segment registers for real mode */ 89 movw %cs,%ax 90 movw %ax,%ds 91 movw %ax,%ss 92 93 /* Small call stack */ 94 mov $0x1000,%sp 95 96 /* Clear flags */ 97 pushl $0 98 popfl 99 100 /* Only beep on reset if machdep.acpi_beep_on_reset=1 */ 101 cmpb $1,WAKEUP_beep_on_reset 102 jne 1f 103 movb $0xc0,%al 104 outb %al,$0x42 105 movb $0x04,%al 106 outb %al,$0x42 107 inb $0x61,%al 108 orb $0x3,%al 109 outb %al,$0x61 110 1: 111 112 /* Only reset the VBIOS if machdep.acpi_vbios_reset=1 */ 113 cmpb $1,WAKEUP_vbios_reset 114 jne 1f 115 116 /* Kick the VBIOS. */ 117 lcall $0xc000,$3 118 119 movw %cs,%ax 120 movw %ax,%ds 121 movw %ax,%ss 122 1: 123 124 /* Disable beep again if machdep.acpi_beep_on_reset=1 */ 125 cmpb $1,WAKEUP_beep_on_reset 126 jne 1f 127 inb $0x61,%al 128 andb $0xfc,%al 129 outb %al,$0x61 130 1: 131 132 data32 addr32 lgdt tmp_gdt 133 134 /* Enable protected mode */ 135 mov %cr0,%eax 136 orl $(CR0_PE),%eax 137 mov %eax,%cr0 138 139 wakeup_sw32: 140 /* Switch to protected mode by intersegmental jump */ 141 ljmpl $0x8,$wakeup_32 + ACPI_WAKEUP_ADDR 142 143 .code32 144 .align 16 145 wakeup_32: 146 /* 147 * Switched to protected mode w/o paging 148 */ 149 150 nop 151 /* Set up segment registers for protected mode */ 152 movw $0x10, %ax 153 movw %ax,%ds 154 movw %ax,%ss 155 156 movl ACPI_WAKEUP_ADDR + 4096,%esp 157 158 /* First, reset the PSL. */ 159 pushl $PSL_MBO 160 popfl 161 162 movl %cr4,%eax 163 orl $(CR4_PAE|CR4_OSFXSR|CR4_OSXMMEXCPT),%eax 164 movl %eax,%cr4 165 166 movl $MSR_EFER,%ecx 167 rdmsr 168 xorl %eax,%eax 169 orl $(EFER_LME|EFER_SCE),%eax 170 wrmsr 171 172 movl WAKEUP_r_cr3 + ACPI_WAKEUP_ADDR,%eax 173 movl %eax,%cr3 174 175 movl WAKEUP_r_cr0 + ACPI_WAKEUP_ADDR,%eax 176 movl %eax,%cr0 177 jmp 1f 178 1: 179 lgdt tmp_gdt64 + ACPI_WAKEUP_ADDR 180 181 ljmp $0x8, $wakeup_64 + ACPI_WAKEUP_ADDR 182 183 .code64 184 wakeup_64: 185 186 movw $GSEL(GDATA_SEL, SEL_KPL),%ax #switch to new segment 187 movw %ax,%ds 188 movw %ax,%es 189 movw %ax,%ss 190 191 movq WAKEUP_restorecpu + ACPI_WAKEUP_ADDR,%rbx 192 193 lgdt WAKEUP_r_gdt + ACPI_WAKEUP_ADDR 194 195 jmp *%rbx 196 197 .align 8 198 tmp_gdt: 199 .word 0xffff 200 .long tmp_gdtable + ACPI_WAKEUP_ADDR 201 202 .align 8, 0 203 tmp_gdtable: 204 /* null */ 205 .word 0, 0 206 .byte 0, 0, 0, 0 207 /* code */ 208 .word 0xffff, 0 209 .byte 0, 0x9f, 0xcf, 0 210 /* data */ 211 .word 0xffff, 0 212 .byte 0, 0x93, 0xcf, 0 213 214 tmp_gdt64: 215 .word 0xffff 216 .long tmp_gdtable64 + ACPI_WAKEUP_ADDR 217 218 tmp_gdtable64: 219 .quad 0x0000000000000000 220 .quad 0x00af9a000000ffff 221 .quad 0x00cf92000000ffff 222 223 .align 16, 0 224 .global WAKEUP_r_cr0 225 WAKEUP_r_cr0: .quad 0 226 .global WAKEUP_r_cr3 227 WAKEUP_r_cr3: .quad 0 228 229 .global WAKEUP_r_gdt 230 WAKEUP_r_gdt: .word 0 231 .quad 0 232 .global WAKEUP_restorecpu 233 WAKEUP_restorecpu: .quad 0 234 235 .global WAKEUP_vbios_reset 236 WAKEUP_vbios_reset: .byte 0 237 .global WAKEUP_beep_on_reset 238 WAKEUP_beep_on_reset: .byte 0 239
Indexes created Thu Oct 02 14:10:14 GMT 2025