acpi_wakecode.S revision 1.8
1 /* $NetBSD: acpi_wakecode.S,v 1.8 2006/06/20 22:36:58 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/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 call beepon 98 99 /* Only reset the VBIOS if machdep.acpi_vbios_reset=1 */ 100 cmpb $1,vbios_reset 101 jne novbiosreset 102 103 /* Kick the VBIOS. */ 104 lcall $0xc000,$3 105 106 movw %cs,%ax 107 movw %ax,%ds 108 movw %ax,%ss 109 novbiosreset: 110 111 call beepoff 112 113 /* Get physical address of the code */ 114 xorl %esi,%esi 115 movw %cs,%si 116 shll $4,%esi 117 118 /* Fill 16->32 address */ 119 movl %esi,%eax 120 addl $wakeup_32,%eax 121 movl %eax,wakeup_sw32+2 122 jmp 1f /* flush prefetch queue */ 123 1: jmp 1f 124 1: 125 126 /* Load GDT while non-paging */ 127 movl %esi,%eax 128 addl $tmp_gdtable,%eax 129 movl %eax,tmp_gdt+2 130 lgdt tmp_gdt 131 132 /* Enable protected mode */ 133 mov %cr0,%eax 134 orl $(CR0_PE),%eax 135 mov %eax,%cr0 136 137 wakeup_sw32: 138 /* Switch to protected mode by intersegmental jump */ 139 ljmpl $0x8,$0x12345678 /* Code location, to be replaced */ 140 141 142 .code32 143 .align 16 144 wakeup_32: 145 /* 146 * Switched to protected mode w/o paging 147 */ 148 149 nop 150 /* Set up segment registers for protected mode */ 151 movw $GSEL(GDATA_SEL,SEL_KPL),%ax 152 movw %ax,%ds 153 movw %ax,%es 154 movw %ax,%gs 155 movw %ax,%ss 156 movw %ax,%fs 157 158 /* Fixup TSS type field; 386 busy TSS (11) -> 386 available TSS (9) */ 159 #define TSS_TYPEFIX_MASK 0xf9 160 movl physical_gdt+2(%esi),%ebx 161 movzxw previous_tr(%esi),%ecx 162 leal (%ebx,%ecx),%eax /* get TSS segment descriptor */ 163 andb $TSS_TYPEFIX_MASK,5(%eax) 164 165 /* Enable paging (assumes identical mapping) */ 166 movl previous_cr3(%esi),%eax 167 movl %eax,%cr3 168 movl previous_cr0(%esi),%eax 169 movl %eax,%cr0 170 171 /* Flush the prefetch queue */ 172 jmp 1f 173 1: jmp 1f 174 1: 175 176 nop 177 178 /* Restore registers */ 179 lgdt previous_gdt(%esi) 180 lidt previous_idt(%esi) 181 lldt previous_ldt(%esi) 182 #if 0 183 ltr previous_tr(%esi) 184 #endif 185 186 mov previous_cr2(%esi),%eax 187 mov %eax,%cr2 188 mov previous_cr4(%esi),%eax 189 mov %eax,%cr4 190 191 movw previous_es(%esi),%ax 192 movw %ax,%es 193 movw previous_fs(%esi),%ax 194 movw %ax,%fs 195 movw previous_gs(%esi),%ax 196 movw %ax,%gs 197 movw previous_ss(%esi),%ax 198 movw %ax,%ss 199 movl where_to_recover(%esi),%ebx 200 movw previous_ds(%esi),%ax 201 movw %ax,%ds 202 jmp *%ebx 203 204 beepon: 205 movb $0xc0,%al 206 outb %al,$0x42 207 movb $0x04,%al 208 outb %al,$0x42 209 inb $0x61,%al 210 orb $0x3,%al 211 outb %al,$0x61 212 ret 213 214 beepoff: 215 inb $0x61,%al 216 andb $0xfc,%al 217 outb %al,$0x61 218 ret 219 220 .align 8 221 tmp_gdt: 222 .word 0xffff 223 .long 0 224 225 .align 8, 0 226 tmp_gdtable: 227 /* null */ 228 .word 0, 0 229 .byte 0, 0, 0, 0 230 /* code */ 231 .word 0xffff, 0 232 .byte 0, 0x9f, 0xcf, 0 233 /* data */ 234 .word 0xffff, 0 235 .byte 0, 0x93, 0xcf, 0 236 237 .align 16, 0 238 physical_gdt: .word 0 239 .long 0 240 previous_cr2: .long 0 241 previous_cr3: .long 0 242 previous_cr4: .long 0 243 previous_cr0: .long 0 244 previous_tr: .word 0 245 previous_gdt: .word 0 246 .long 0 247 previous_ldt: .word 0 248 previous_idt: .word 0 249 .long 0 250 previous_ds: .word 0 251 previous_es: .word 0 252 previous_fs: .word 0 253 previous_gs: .word 0 254 previous_ss: .word 0 255 where_to_recover: .long 0 256 vbios_reset: .byte 0 257
Indexes created Fri Oct 03 14:09:59 GMT 2025