acpi_wakecode.S revision 1.10
1 /* $NetBSD: acpi_wakecode.S,v 1.10 2007/12/09 20:27:44 jmcneill 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/specialreg.h> 74 #include <machine/segments.h> 75 76 #define ACPI_WAKEUP_ADDR 0x3000 77 78 .text 79 .code16 80 .org 0 /* ACPI spec says: cs==(phys>>8), ip==(phys&0x000F) */ 81 .globl wakeup_16 82 wakeup_16: 83 nop 84 cli 85 cld 86 87 /* Set up segment registers for real mode */ 88 movw %cs,%ax 89 movw %ax,%ds 90 movw %ax,%ss 91 92 /* Small call stack */ 93 mov $0x1000,%sp 94 95 /* Clear flags */ 96 pushl $0 97 popfl 98 99 /* Only beep on reset if machdep.acpi_beep_on_reset=1 */ 100 cmpb $1,WAKEUP_beep_on_reset 101 jne 1f 102 movb $0xc0,%al 103 outb %al,$0x42 104 movb $0x04,%al 105 outb %al,$0x42 106 inb $0x61,%al 107 orb $0x3,%al 108 outb %al,$0x61 109 1: 110 111 /* Only reset the VBIOS if machdep.acpi_vbios_reset=1 */ 112 cmpb $1,WAKEUP_vbios_reset 113 jne 1f 114 115 /* Kick the VBIOS. */ 116 lcall $0xc000,$3 117 118 movw %cs,%ax 119 movw %ax,%ds 120 movw %ax,%ss 121 1: 122 123 /* Disable beep again if machdep.acpi_beep_on_reset=1 */ 124 cmpb $1,WAKEUP_beep_on_reset 125 jne 1 126 inb $0x61,%al 127 andb $0xfc,%al 128 outb %al,$0x61 129 1: 130 131 /* Load GDT while non-paging */ 132 lgdt tmp_gdt 133 134 /* Enable protected mode */ 135 mov %cr0,%eax 136 orl $(CR0_PE),%eax 137 mov %eax,%cr0 138 139 /* Switch to protected mode by intersegmental jump */ 140 ljmpl $0x8,$wakeup_32 + ACPI_WAKEUP_ADDR 141 142 143 .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 $GSEL(GDATA_SEL,SEL_KPL),%ax 153 movw %ax,%ds 154 155 /* Restore PSE and other settings before enabling paging. */ 156 movl WAKEUP_r_cr4 + ACPI_WAKEUP_ADDR,%eax 157 movl %eax,%cr4 158 159 /* Enable paging (assumes identical mapping) */ 160 movl WAKEUP_r_cr3 + ACPI_WAKEUP_ADDR,%eax 161 movl %eax,%cr3 162 movl WAKEUP_r_cr0 + ACPI_WAKEUP_ADDR,%eax 163 movl %eax,%cr0 164 165 /* Flush the prefetch queue */ 166 jmp 1f 167 1: jmp 1f 168 1: 169 170 nop 171 172 /* Restore registers */ 173 lgdt WAKEUP_r_gdt + ACPI_WAKEUP_ADDR 174 175 movl WAKEUP_restorecpu + ACPI_WAKEUP_ADDR,%ebx 176 movw WAKEUP_r_ds + ACPI_WAKEUP_ADDR,%ax 177 movw %ax,%ds 178 jmp *%ebx 179 180 .align 8 181 tmp_gdt: 182 .word 0xffff 183 .long tmp_gdtable + ACPI_WAKEUP_ADDR 184 185 .align 8, 0 186 tmp_gdtable: 187 /* null */ 188 .word 0, 0 189 .byte 0, 0, 0, 0 190 /* code */ 191 .word 0xffff, 0 192 .byte 0, 0x9f, 0xcf, 0 193 /* data */ 194 .word 0xffff, 0 195 .byte 0, 0x93, 0xcf, 0 196 197 .align 16, 0 198 .global WAKEUP_r_cr0 199 WAKEUP_r_cr0: .long 0 200 .global WAKEUP_r_cr3 201 WAKEUP_r_cr3: .long 0 202 .global WAKEUP_r_cr4 203 WAKEUP_r_cr4: .long 0 204 205 .global WAKEUP_r_gdt 206 WAKEUP_r_gdt: .word 0 207 .long 0 208 .global WAKEUP_r_ds 209 WAKEUP_r_ds: .word 0 210 .global WAKEUP_restorecpu 211 WAKEUP_restorecpu: .long 0 212 213 .global WAKEUP_vbios_reset 214 WAKEUP_vbios_reset: .byte 0 215 .global WAKEUP_beep_on_reset 216 WAKEUP_beep_on_reset: .byte 0 217
Indexes created Fri Oct 03 02:09:57 GMT 2025