acpi_wakecode.S revision 1.2
1 /* $NetBSD: acpi_wakecode.S,v 1.2 2007/12/09 20:27:42 jmcneill Exp $ */ 2 3 /*- 4 * Copyright (c) 2007 Joerg Sonnenberger <joerg (at) netbsd.org> 5 * 6 * Copyright (c) 2002 The NetBSD Foundation, Inc. 7 * All rights reserved. 8 * 9 * This code is derived from software contributed to The NetBSD Foundation 10 * by Takuya SHIOZAKI. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the NetBSD 23 * Foundation, Inc. and its contributors. 24 * 4. Neither the name of The NetBSD Foundation nor the names of its 25 * contributors may be used to endorse or promote products derived 26 * from this software without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 29 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 30 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 31 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 32 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 33 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 34 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 35 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 36 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 37 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 38 * POSSIBILITY OF SUCH DAMAGE. 39 */ 40 41 42 /* 43 * This code is derived from FreeBSD. Original copyrights: 44 * 45 * Copyright (c) 2001 Takanori Watanabe <takawata (at) jp.freebsd.org> 46 * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki (at) jp.freebsd.org> 47 * All rights reserved. 48 * 49 * Redistribution and use in source and binary forms, with or without 50 * modification, are permitted provided that the following conditions 51 * are met: 52 * 1. Redistributions of source code must retain the above copyright 53 * notice, this list of conditions and the following disclaimer. 54 * 2. Redistributions in binary form must reproduce the above copyright 55 * notice, this list of conditions and the following disclaimer in the 56 * documentation and/or other materials provided with the distribution. 57 * 58 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 59 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 60 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 61 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 62 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 63 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 64 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 65 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 66 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 67 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 68 * SUCH DAMAGE. 69 * 70 * FreeBSD: src/sys/i386/acpica/acpi_wakecode.S,v 1.1 2001/07/20 06:07:31 takawata Exp 71 */ 72 73 #define _LOCORE 74 75 #include <machine/psl.h> 76 #include <machine/specialreg.h> 77 #include <machine/segments.h> 78 79 #define ACPI_WAKEUP_ADDR 0x3000 80 81 .text 82 .code16 83 .org 0 /* ACPI spec says: cs==(phys>>8), ip==(phys&0x000F) */ 84 .globl wakeup_16 85 wakeup_16: 86 nop 87 cli 88 cld 89 90 /* Set up segment registers for real mode */ 91 movw %cs,%ax 92 movw %ax,%ds 93 movw %ax,%ss 94 95 /* Small call stack */ 96 mov $0x1000,%sp 97 98 /* Clear flags */ 99 pushl $0 100 popfl 101 102 /* Only beep on reset if machdep.acpi_beep_on_reset=1 */ 103 cmpb $1,WAKEUP_beep_on_reset 104 jne 1f 105 movb $0xc0,%al 106 outb %al,$0x42 107 movb $0x04,%al 108 outb %al,$0x42 109 inb $0x61,%al 110 orb $0x3,%al 111 outb %al,$0x61 112 1: 113 114 /* Only reset the VBIOS if machdep.acpi_vbios_reset=1 */ 115 cmpb $1,WAKEUP_vbios_reset 116 jne 1f 117 118 /* Kick the VBIOS. */ 119 lcall $0xc000,$3 120 121 /* Reset registers in case the VBIOS changed them. */ 122 movw %cs,%ax 123 movw %ax,%ds 124 movw %ax,%ss 125 1: 126 127 /* Disable beep again if machdep.acpi_beep_on_reset=1 */ 128 cmpb $1,WAKEUP_beep_on_reset 129 jne 1f 130 inb $0x61,%al 131 andb $0xfc,%al 132 outb %al,$0x61 133 1: 134 135 /* Load temporary 32bit GDT */ 136 data32 addr32 lgdt tmp_gdt 137 138 /* Enable protected mode w/o paging */ 139 mov %cr0,%eax 140 orl $(CR0_PE),%eax 141 mov %eax,%cr0 142 143 wakeup_sw32: 144 /* 145 * Switch to protected mode by intersegmental jump. 146 * Target and everything else has to compensate for the new origin 147 * as this is using the flat memory model now. 148 */ 149 150 ljmpl $0x8,$wakeup_32 + ACPI_WAKEUP_ADDR 151 152 .code32 153 .align 16 154 wakeup_32: 155 /* 156 * Switched to protected mode w/o paging 157 */ 158 159 nop 160 /* Set up segment registers and initial stack for protected mode */ 161 movw $0x10, %ax 162 movw %ax,%ds 163 movw %ax,%ss 164 165 movl $(ACPI_WAKEUP_ADDR + 4096),%esp 166 167 /* First, reset the PSL. */ 168 pushl $PSL_MBO 169 popfl 170 171 /* Enable PAE and potentially PSE */ 172 movl $(CR4_PAE|CR4_OSFXSR|CR4_OSXMMEXCPT|CR4_PSE),%eax 173 movl %eax,%cr4 174 175 /* Enable SYSCALL extension and Long Mode */ 176 movl $MSR_EFER,%ecx 177 rdmsr 178 xorl %eax,%eax 179 orl $(EFER_LME|EFER_SCE),%eax 180 wrmsr 181 182 /* Load temporary PML4, code will switch to full PML4 later */ 183 movl WAKEUP_r_cr3 + ACPI_WAKEUP_ADDR,%eax 184 movl %eax,%cr3 185 186 /* Enable paging */ 187 movl %cr0,%eax 188 orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP),%eax 189 movl %eax,%cr0 190 /* Flush prefetch queue */ 191 jmp 1f 192 1: 193 /* Switch to temporary 64bit GDT */ 194 lgdt tmp_gdt64 + ACPI_WAKEUP_ADDR 195 196 /* Switch to long mode using intersegmental jump. */ 197 ljmp $0x8, $wakeup_64 + ACPI_WAKEUP_ADDR 198 199 .code64 200 wakeup_64: 201 202 /* Reload normal segment registers with correct values */ 203 movw $GSEL(GDATA_SEL, SEL_KPL),%ax 204 movw %ax,%ds 205 movw %ax,%es 206 movw %ax,%ss 207 208 movq WAKEUP_restorecpu + ACPI_WAKEUP_ADDR,%rbx 209 210 /* Continue with wakeup in the high-level wakeup code */ 211 jmp *%rbx 212 213 .align 8 214 tmp_gdt: 215 .word 0xffff 216 .long tmp_gdtable + ACPI_WAKEUP_ADDR 217 218 .align 8, 0 219 tmp_gdtable: 220 /* null */ 221 .word 0, 0 222 .byte 0, 0, 0, 0 223 /* code */ 224 .word 0xffff, 0 225 .byte 0, 0x9f, 0xcf, 0 226 /* data */ 227 .word 0xffff, 0 228 .byte 0, 0x93, 0xcf, 0 229 230 tmp_gdt64: 231 .word 0xffff 232 .long tmp_gdtable64 + ACPI_WAKEUP_ADDR 233 234 tmp_gdtable64: 235 .quad 0x0000000000000000 236 .quad 0x00af9a000000ffff 237 .quad 0x00cf92000000ffff 238 239 .align 16, 0 240 .global WAKEUP_r_cr3 241 WAKEUP_r_cr3: .quad 0 242 243 .global WAKEUP_restorecpu 244 WAKEUP_restorecpu: .quad 0 245 246 .global WAKEUP_vbios_reset 247 WAKEUP_vbios_reset: .byte 0 248 .global WAKEUP_beep_on_reset 249 WAKEUP_beep_on_reset: .byte 0 250
Indexes created Thu Sep 25 16:09:42 GMT 2025