acpi_wakecode.S revision 1.1
1 /* $NetBSD: acpi_wakecode.S,v 1.1 2002/06/18 07:25:13 tshiozak 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/param.h> 75 76 .code16 77 .org 0 /* ACPI spec says: cs==(phys>>8), ip==(phys&0x000F) */ 78 wakeup_16: 79 nop 80 cli 81 82 /* Set up segment registers for real mode */ 83 movw %cs,%ax 84 movw %ax,%ds 85 movw %ax,%ss 86 87 /* Get physical address of the code */ 88 xorl %esi,%esi 89 movw %cs,%si 90 shll $4,%esi 91 92 /* Fill 16->32 address */ 93 movl %esi,%eax 94 addl $wakeup_32,%eax 95 movl %eax,wakeup_sw32+2 96 jmp 1f /* flush prefetch queue */ 97 1: jmp 1f 98 1: 99 100 /* Load GDT while non-paging */ 101 movl %esi,%eax 102 addl $tmp_gdtable,%eax 103 movl %eax,tmp_gdt+2 104 lgdt tmp_gdt 105 106 /* Enable protected mode */ 107 mov %cr0,%eax 108 orl $(CR0_PE),%eax 109 mov %eax,%cr0 110 111 wakeup_sw32: 112 /* Switch to protected mode by intersegmental jump */ 113 ljmpl $0x8,$0x12345678 /* Code location, to be replaced */ 114 115 116 .code32 117 .align 16 118 wakeup_32: 119 /* 120 * Switched to protected mode w/o paging 121 */ 122 123 nop 124 /* Set up segment registers for protected mode */ 125 movw $0x10,%ax /* KDSEL to segment registers */ 126 movw %ax,%ds 127 movw %ax,%es 128 movw %ax,%gs 129 movw %ax,%ss 130 movw %ax,%fs 131 132 /* Fixup TSS type field; 386 busy TSS (11) -> 386 available TSS (9) */ 133 #define TSS_TYPEFIX_MASK 0xf9 134 movl physical_gdt+2(%esi),%ebx 135 movzxw previous_tr(%esi),%ecx 136 leal (%ebx,%ecx),%eax /* get TSS segment descriptor */ 137 andb $TSS_TYPEFIX_MASK,5(%eax) 138 139 /* Enable paging (assumes identical mapping) */ 140 movl previous_cr3(%esi),%eax 141 movl %eax,%cr3 142 movl previous_cr0(%esi),%eax 143 movl %eax,%cr0 144 145 /* Flush the prefetch queue */ 146 jmp 1f 147 1: jmp 1f 148 1: 149 150 /* Restore registers */ 151 lgdt previous_gdt(%esi) 152 lidt previous_idt(%esi) 153 lldt previous_ldt(%esi) 154 ltr previous_tr(%esi) 155 156 mov previous_cr2(%esi),%eax 157 mov %eax,%cr2 158 mov previous_cr4(%esi),%eax 159 mov %eax,%cr4 160 161 movw previous_es(%esi),%ax 162 movw %ax,%es 163 movw previous_fs(%esi),%ax 164 movw %ax,%fs 165 movw previous_gs(%esi),%ax 166 movw %ax,%gs 167 movw previous_ss(%esi),%ax 168 movw %ax,%ss 169 movl where_to_recover(%esi),%ebx 170 movw previous_ds(%esi),%ax 171 movw %ax,%ds 172 jmp *%ebx 173 174 175 .align 8 176 tmp_gdt: 177 .word 0xffff 178 .long 0 179 180 .align 8, 0 181 tmp_gdtable: 182 /* null */ 183 .word 0, 0 184 .byte 0, 0, 0, 0 185 /* code */ 186 .word 0xffff, 0 187 .byte 0, 0x9f, 0xcf, 0 188 /* data */ 189 .word 0xffff, 0 190 .byte 0, 0x93, 0xcf, 0 191 192 .align 16, 0 193 physical_gdt: .word 0 194 .long 0 195 previous_cr2: .long 0 196 previous_cr3: .long 0 197 previous_cr4: .long 0 198 previous_cr0: .long 0 199 previous_tr: .word 0 200 previous_gdt: .word 0 201 .long 0 202 previous_ldt: .word 0 203 previous_idt: .word 0 204 .long 0 205 previous_ds: .word 0 206 previous_es: .word 0 207 previous_fs: .word 0 208 previous_gs: .word 0 209 previous_ss: .word 0 210 where_to_recover: .long 0 211
Indexes created Fri Oct 03 14:09:59 GMT 2025