/* $NetBSD: acpi_wakecode.S,v 1.18 2016/07/24 14:09:22 maxv Exp $ */ /*- * Copyright (c) 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Takuya SHIOZAKI. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /* * This code is derived from FreeBSD. Original copyrights: * * Copyright (c) 2001 Takanori Watanabe * Copyright (c) 2001 Mitsuru IWASAKI * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * FreeBSD: src/sys/i386/acpica/acpi_wakecode.S,v 1.1 2001/07/20 06:07:31 takawata Exp */ #define _LOCORE #include #include #define ACPI_WAKEUP_ADDR 0x3000 .text .code16 .org 0 /* ACPI spec says: cs==(phys>>8), ip==(phys&0x000F) */ .globl wakeup_16 wakeup_16: nop cli cld /* Set up segment registers for real mode */ movw %cs,%ax movw %ax,%ds movw %ax,%ss /* Small call stack */ mov $0x1000,%sp /* Clear flags */ pushl $0 popfl /* Only beep on reset if machdep.acpi_beep_on_reset=1 */ cmpb $1,WAKEUP_beep_on_reset jne 1f movb $0xc0,%al outb %al,$0x42 movb $0x04,%al outb %al,$0x42 inb $0x61,%al orb $0x3,%al outb %al,$0x61 1: /* Only reset the VBIOS if machdep.acpi_vbios_reset=1 */ cmpb $1,WAKEUP_vbios_reset jne 1f /* Kick the VBIOS. */ lcall $0xc000,$3 movw %cs,%ax movw %ax,%ds movw %ax,%ss /* If we need to restore a VESA VBE mode, do it now */ cmpb $0,WAKEUP_vesa_modenum je 1f movw WAKEUP_vesa_modenum,%bx orw $0x4000,%bx movw $0x4f02,%ax int $0x10 movw %cs,%ax movw %ax,%ds movw %ax,%ss 1: /* Disable beep again if machdep.acpi_beep_on_reset=1 */ cmpb $1,WAKEUP_beep_on_reset jne 1f inb $0x61,%al andb $0xfc,%al outb %al,$0x61 1: /* Load GDT while non-paging */ lgdt tmp_gdt /* Enable protected mode without paging */ mov %cr0,%eax orl $(CR0_PE),%eax mov %eax,%cr0 /* Switch to protected mode by intersegmental jump */ ljmpl $0x8,$wakeup_32 + ACPI_WAKEUP_ADDR .code32 .align 16 wakeup_32: /* * Switched to protected mode w/o paging */ nop /* Set up segment registers for protected mode */ movw $GSEL(GDATA_SEL,SEL_KPL),%ax movw %ax,%ds /* Enable potentially PSE and PAE */ movl WAKEUP_r_cr4 + ACPI_WAKEUP_ADDR,%eax movl %eax,%cr4 /* * Load the correct MSR EFER value now to not depend on the * data segment register. After this point, no instruction is * allowed to clobber %ebx until wrmsr. */ movl WAKEUP_efer + ACPI_WAKEUP_ADDR,%ebx /* Load temporary page table, we will switch to full page table later */ movl WAKEUP_r_cr3 + ACPI_WAKEUP_ADDR,%eax movl %eax,%cr3 /* Enable paging */ movl %cr0,%eax orl $(CR0_PE|CR0_PG|CR0_NE|CR0_TS|CR0_MP|CR0_WP|CR0_AM),%eax movl %eax,%cr0 /* Flush the prefetch queue */ jmp 1f 1: jmp 1f 1: nop /* * Load the normal system value of MSR EFER. This includes * enabling NXE (if supported). */ movl %ebx,%eax movl $0,%edx movl $MSR_EFER,%ecx wrmsr /* Restore registers */ movl WAKEUP_curcpu + ACPI_WAKEUP_ADDR,%edx movl WAKEUP_restorecpu + ACPI_WAKEUP_ADDR,%ebx /* Continue with wakeup in the high-level wakeup code */ jmp *%ebx .align 8 tmp_gdt: .word 0xffff .long tmp_gdtable + ACPI_WAKEUP_ADDR .align 8, 0 tmp_gdtable: /* null */ .word 0, 0 .byte 0, 0, 0, 0 /* code */ .word 0xffff, 0 .byte 0, 0x9f, 0xcf, 0 /* data */ .word 0xffff, 0 .byte 0, 0x93, 0xcf, 0 .align 16, 0 .global WAKEUP_r_cr3 WAKEUP_r_cr3: .long 0 .global WAKEUP_r_cr4 WAKEUP_r_cr4: .long 0 .global WAKEUP_curcpu WAKEUP_curcpu: .long 0 .global WAKEUP_restorecpu WAKEUP_restorecpu: .long 0 .global WAKEUP_efer WAKEUP_efer: .long 0 .global WAKEUP_vbios_reset WAKEUP_vbios_reset: .byte 0 .global WAKEUP_vesa_modenum WAKEUP_vesa_modenum: .word 0 .global WAKEUP_beep_on_reset WAKEUP_beep_on_reset: .byte 0