acpi_wakecode.S revision 1.9
1 /* $NetBSD: acpi_wakecode.S,v 1.9 2007/04/28 14:03:00 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/asm.h> 74 #include <machine/specialreg.h> 75 #include <machine/param.h> 76 #include <machine/segments.h> 77 78 .code16 79 .org 0 /* ACPI spec says: cs==(phys>>8), ip==(phys&0x000F) */ 80 wakeup_16: 81 nop 82 cli 83 cld 84 85 /* Set up segment registers for real mode */ 86 movw %cs,%ax 87 movw %ax,%ds 88 movw %ax,%ss 89 90 /* Small call stack */ 91 movw $0x1000,%sp 92 93 /* Clear flags */ 94 pushl $0 95 popfl 96 97 /* Only beep on reset if machdep.acpi_beep_on_reset=1 */ 98 cmpb $1,beep_on_reset 99 jne nobeepon 100 call beepon 101 nobeepon: 102 103 /* Only reset the VBIOS if machdep.acpi_vbios_reset=1 */ 104 cmpb $1,vbios_reset 105 jne novbiosreset 106 107 /* Kick the VBIOS. */ 108 lcall $0xc000,$3 109 110 movw %cs,%ax 111 movw %ax,%ds 112 movw %ax,%ss 113 novbiosreset: 114 115 /* Only beep on reset if machdep.acpi_beep_on_reset=1 */ 116 cmpb $1,beep_on_reset 117 jne nobeepoff 118 call beepoff 119 nobeepoff: 120 121 /* Get physical address of the code */ 122 xorl %esi,%esi 123 movw %cs,%si 124 shll $4,%esi 125 126 /* Fill 16->32 address */ 127 movl %esi,%eax 128 addl $wakeup_32,%eax 129 movl %eax,wakeup_sw32+2 130 jmp 1f /* flush prefetch queue */ 131 1: jmp 1f 132 1: 133 134 /* Load GDT while non-paging */ 135 movl %esi,%eax 136 addl $tmp_gdtable,%eax 137 movl %eax,tmp_gdt+2 138 lgdt tmp_gdt 139 140 /* Enable protected mode */ 141 mov %cr0,%eax 142 orl $(CR0_PE),%eax 143 mov %eax,%cr0 144 145 wakeup_sw32: 146 /* Switch to protected mode by intersegmental jump */ 147 ljmpl $0x8,$0x12345678 /* Code location, to be replaced */ 148 149 150 .code32 151 .align 16 152 wakeup_32: 153 /* 154 * Switched to protected mode w/o paging 155 */ 156 157 nop 158 /* Set up segment registers for protected mode */ 159 movw $GSEL(GDATA_SEL,SEL_KPL),%ax 160 movw %ax,%ds 161 movw %ax,%es 162 movw %ax,%gs 163 movw %ax,%ss 164 movw %ax,%fs 165 166 /* Fixup TSS type field; 386 busy TSS (11) -> 386 available TSS (9) */ 167 #define TSS_TYPEFIX_MASK 0xf9 168 movl physical_gdt+2(%esi),%ebx 169 movzxw previous_tr(%esi),%ecx 170 leal (%ebx,%ecx),%eax /* get TSS segment descriptor */ 171 andb $TSS_TYPEFIX_MASK,5(%eax) 172 173 /* Enable paging (assumes identical mapping) */ 174 movl previous_cr3(%esi),%eax 175 movl %eax,%cr3 176 movl previous_cr0(%esi),%eax 177 movl %eax,%cr0 178 179 /* Flush the prefetch queue */ 180 jmp 1f 181 1: jmp 1f 182 1: 183 184 nop 185 186 /* Restore registers */ 187 lgdt previous_gdt(%esi) 188 lidt previous_idt(%esi) 189 lldt previous_ldt(%esi) 190 #if 0 191 ltr previous_tr(%esi) 192 #endif 193 194 mov previous_cr2(%esi),%eax 195 mov %eax,%cr2 196 mov previous_cr4(%esi),%eax 197 mov %eax,%cr4 198 199 movw previous_es(%esi),%ax 200 movw %ax,%es 201 movw previous_fs(%esi),%ax 202 movw %ax,%fs 203 movw previous_gs(%esi),%ax 204 movw %ax,%gs 205 movw previous_ss(%esi),%ax 206 movw %ax,%ss 207 movl where_to_recover(%esi),%ebx 208 movw previous_ds(%esi),%ax 209 movw %ax,%ds 210 jmp *%ebx 211 212 beepon: 213 movb $0xc0,%al 214 outb %al,$0x42 215 movb $0x04,%al 216 outb %al,$0x42 217 inb $0x61,%al 218 orb $0x3,%al 219 outb %al,$0x61 220 ret 221 222 beepoff: 223 inb $0x61,%al 224 andb $0xfc,%al 225 outb %al,$0x61 226 ret 227 228 .align 8 229 tmp_gdt: 230 .word 0xffff 231 .long 0 232 233 .align 8, 0 234 tmp_gdtable: 235 /* null */ 236 .word 0, 0 237 .byte 0, 0, 0, 0 238 /* code */ 239 .word 0xffff, 0 240 .byte 0, 0x9f, 0xcf, 0 241 /* data */ 242 .word 0xffff, 0 243 .byte 0, 0x93, 0xcf, 0 244 245 .align 16, 0 246 physical_gdt: .word 0 247 .long 0 248 previous_cr2: .long 0 249 previous_cr3: .long 0 250 previous_cr4: .long 0 251 previous_cr0: .long 0 252 previous_tr: .word 0 253 previous_gdt: .word 0 254 .long 0 255 previous_ldt: .word 0 256 previous_idt: .word 0 257 .long 0 258 previous_ds: .word 0 259 previous_es: .word 0 260 previous_fs: .word 0 261 previous_gs: .word 0 262 previous_ss: .word 0 263 where_to_recover: .long 0 264 vbios_reset: .byte 0 265 beep_on_reset: .byte 0 266
Indexes created Fri Oct 03 14:09:59 GMT 2025