/* $NetBSD: acpi_wakecode.S,v 1.3 2004/04/10 11:50:55 kochi 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * 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 #include .code16 .org 0 /* ACPI spec says: cs==(phys>>8), ip==(phys&0x000F) */ wakeup_16: nop cli /* Set up segment registers for real mode */ movw %cs,%ax movw %ax,%ds movw %ax,%ss /* Get physical address of the code */ xorl %esi,%esi movw %cs,%si shll $4,%esi /* Fill 16->32 address */ movl %esi,%eax addl $wakeup_32,%eax movl %eax,wakeup_sw32+2 jmp 1f /* flush prefetch queue */ 1: jmp 1f 1: /* Load GDT while non-paging */ movl %esi,%eax addl $tmp_gdtable,%eax movl %eax,tmp_gdt+2 lgdt tmp_gdt /* Enable protected mode */ mov %cr0,%eax orl $(CR0_PE),%eax mov %eax,%cr0 wakeup_sw32: /* Switch to protected mode by intersegmental jump */ ljmpl $0x8,$0x12345678 /* Code location, to be replaced */ .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 movw %ax,%es movw %ax,%gs movw %ax,%ss movw %ax,%fs /* Fixup TSS type field; 386 busy TSS (11) -> 386 available TSS (9) */ #define TSS_TYPEFIX_MASK 0xf9 movl physical_gdt+2(%esi),%ebx movzxw previous_tr(%esi),%ecx leal (%ebx,%ecx),%eax /* get TSS segment descriptor */ andb $TSS_TYPEFIX_MASK,5(%eax) /* Enable paging (assumes identical mapping) */ movl previous_cr3(%esi),%eax movl %eax,%cr3 movl previous_cr0(%esi),%eax movl %eax,%cr0 /* Flush the prefetch queue */ jmp 1f 1: jmp 1f 1: /* Restore registers */ lgdt previous_gdt(%esi) lidt previous_idt(%esi) lldt previous_ldt(%esi) ltr previous_tr(%esi) mov previous_cr2(%esi),%eax mov %eax,%cr2 mov previous_cr4(%esi),%eax mov %eax,%cr4 movw previous_es(%esi),%ax movw %ax,%es movw previous_fs(%esi),%ax movw %ax,%fs movw previous_gs(%esi),%ax movw %ax,%gs movw previous_ss(%esi),%ax movw %ax,%ss movl where_to_recover(%esi),%ebx movw previous_ds(%esi),%ax movw %ax,%ds jmp *%ebx .align 8 tmp_gdt: .word 0xffff .long 0 .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 physical_gdt: .word 0 .long 0 previous_cr2: .long 0 previous_cr3: .long 0 previous_cr4: .long 0 previous_cr0: .long 0 previous_tr: .word 0 previous_gdt: .word 0 .long 0 previous_ldt: .word 0 previous_idt: .word 0 .long 0 previous_ds: .word 0 previous_es: .word 0 previous_fs: .word 0 previous_gs: .word 0 previous_ss: .word 0 where_to_recover: .long 0