1 /* $NetBSD: acpi_wakecode.S,v 1.18 2016/07/24 14:09:22 maxv 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* 33 * This code is derived from FreeBSD. Original copyrights: 34 * 35 * Copyright (c) 2001 Takanori Watanabe <takawata (at) jp.freebsd.org> 36 * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki (at) jp.freebsd.org> 37 * All rights reserved. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 48 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 51 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 58 * SUCH DAMAGE. 59 * 60 * FreeBSD: src/sys/i386/acpica/acpi_wakecode.S,v 1.1 2001/07/20 06:07:31 takawata Exp 61 */ 62 63 #define _LOCORE 64 65 #include <machine/specialreg.h> 66 #include <machine/segments.h> 67 68 #define ACPI_WAKEUP_ADDR 0x3000 69 70 .text 71 .code16 72 .org 0 /* ACPI spec says: cs==(phys>>8), ip==(phys&0x000F) */ 73 .globl wakeup_16 74 wakeup_16: 75 nop 76 cli 77 cld 78 79 /* Set up segment registers for real mode */ 80 movw %cs,%ax 81 movw %ax,%ds 82 movw %ax,%ss 83 84 /* Small call stack */ 85 mov $0x1000,%sp 86 87 /* Clear flags */ 88 pushl $0 89 popfl 90 91 /* Only beep on reset if machdep.acpi_beep_on_reset=1 */ 92 cmpb $1,WAKEUP_beep_on_reset 93 jne 1f 94 movb $0xc0,%al 95 outb %al,$0x42 96 movb $0x04,%al 97 outb %al,$0x42 98 inb $0x61,%al 99 orb $0x3,%al 100 outb %al,$0x61 101 1: 102 103 /* Only reset the VBIOS if machdep.acpi_vbios_reset=1 */ 104 cmpb $1,WAKEUP_vbios_reset 105 jne 1f 106 107 /* Kick the VBIOS. */ 108 lcall $0xc000,$3 109 110 movw %cs,%ax 111 movw %ax,%ds 112 movw %ax,%ss 113 114 /* If we need to restore a VESA VBE mode, do it now */ 115 cmpb $0,WAKEUP_vesa_modenum 116 je 1f 117 movw WAKEUP_vesa_modenum,%bx 118 orw $0x4000,%bx 119 movw $0x4f02,%ax 120 int $0x10 121 122 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 GDT while non-paging */ 136 lgdt tmp_gdt 137 138 /* Enable protected mode without paging */ 139 mov %cr0,%eax 140 orl $(CR0_PE),%eax 141 mov %eax,%cr0 142 143 /* Switch to protected mode by intersegmental jump */ 144 ljmpl $0x8,$wakeup_32 + ACPI_WAKEUP_ADDR 145 146 .code32 147 .align 16 148 wakeup_32: 149 /* 150 * Switched to protected mode w/o paging 151 */ 152 nop 153 154 /* Set up segment registers for protected mode */ 155 movw $GSEL(GDATA_SEL,SEL_KPL),%ax 156 movw %ax,%ds 157 158 /* Enable potentially PSE and PAE */ 159 movl WAKEUP_r_cr4 + ACPI_WAKEUP_ADDR,%eax 160 movl %eax,%cr4 161 162 /* 163 * Load the correct MSR EFER value now to not depend on the 164 * data segment register. After this point, no instruction is 165 * allowed to clobber %ebx until wrmsr. 166 */ 167 movl WAKEUP_efer + ACPI_WAKEUP_ADDR,%ebx 168 169 /* Load temporary page table, we will switch to full page table later */ 170 movl WAKEUP_r_cr3 + ACPI_WAKEUP_ADDR,%eax 171 movl %eax,%cr3 172 173 /* Enable paging */ 174 movl %cr0,%eax 175 orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax 176 movl %eax,%cr0 177 178 /* Flush the prefetch queue */ 179 jmp 1f 180 1: jmp 1f 181 1: 182 183 nop 184 185 /* 186 * Load the normal system value of MSR EFER. This includes 187 * enabling NXE (if supported). 188 */ 189 movl %ebx,%eax 190 movl $0,%edx 191 movl $MSR_EFER,%ecx 192 wrmsr 193 194 /* Restore registers */ 195 movl WAKEUP_curcpu + ACPI_WAKEUP_ADDR,%edx 196 movl WAKEUP_restorecpu + ACPI_WAKEUP_ADDR,%ebx 197 198 /* Continue with wakeup in the high-level wakeup code */ 199 jmp *%ebx 200 201 .align 8 202 tmp_gdt: 203 .word 0xffff 204 .long tmp_gdtable + ACPI_WAKEUP_ADDR 205 206 .align 8, 0 207 tmp_gdtable: 208 /* null */ 209 .word 0, 0 210 .byte 0, 0, 0, 0 211 /* code */ 212 .word 0xffff, 0 213 .byte 0, 0x9f, 0xcf, 0 214 /* data */ 215 .word 0xffff, 0 216 .byte 0, 0x93, 0xcf, 0 217 218 .align 16, 0 219 .global WAKEUP_r_cr3 220 WAKEUP_r_cr3: .long 0 221 .global WAKEUP_r_cr4 222 WAKEUP_r_cr4: .long 0 223 224 .global WAKEUP_curcpu 225 WAKEUP_curcpu: .long 0 226 .global WAKEUP_restorecpu 227 WAKEUP_restorecpu: .long 0 228 .global WAKEUP_efer 229 WAKEUP_efer: .long 0 230 231 .global WAKEUP_vbios_reset 232 WAKEUP_vbios_reset: .byte 0 233 .global WAKEUP_vesa_modenum 234 WAKEUP_vesa_modenum: .word 0 235 .global WAKEUP_beep_on_reset 236 WAKEUP_beep_on_reset: .byte 0 237
Indexes created Thu Oct 02 14:10:14 GMT 2025