acpi_wakecode.S revision 121641
180028Stakawata/*- 280028Stakawata * Copyright (c) 2001 Takanori Watanabe <takawata@jp.freebsd.org> 380028Stakawata * Copyright (c) 2001 Mitsuru IWASAKI <iwasaki@jp.freebsd.org> 480028Stakawata * All rights reserved. 580028Stakawata * 680028Stakawata * Redistribution and use in source and binary forms, with or without 780028Stakawata * modification, are permitted provided that the following conditions 880028Stakawata * are met: 980028Stakawata * 1. Redistributions of source code must retain the above copyright 1080028Stakawata * notice, this list of conditions and the following disclaimer. 1180028Stakawata * 2. Redistributions in binary form must reproduce the above copyright 1280028Stakawata * notice, this list of conditions and the following disclaimer in the 1380028Stakawata * documentation and/or other materials provided with the distribution. 1480028Stakawata * 1580028Stakawata * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 1680028Stakawata * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1780028Stakawata * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 1880028Stakawata * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 1980028Stakawata * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2080028Stakawata * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2180028Stakawata * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2280028Stakawata * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2380028Stakawata * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2480028Stakawata * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2580028Stakawata * SUCH DAMAGE. 2680028Stakawata */ 2780028Stakawata 28115681Sobrien#include <machine/asm.h> 29115681Sobrien__FBSDID("$FreeBSD: head/sys/i386/acpica/acpi_wakecode.S 121641 2003-10-29 03:30:45Z iwasaki $"); 30115681Sobrien 3180028Stakawata#define LOCORE 3280028Stakawata 3380028Stakawata#include <machine/specialreg.h> 3480028Stakawata 3580028Stakawata .align 4 3680028Stakawata .code16 3780028Stakawatawakeup_16: 3880028Stakawata nop 3980028Stakawata cli 4080028Stakawata 4180028Stakawata /* Set up segment registers for real mode */ 4280028Stakawata movw %cs,%ax 4380028Stakawata movw %ax,%ds 4480028Stakawata movw %ax,%ss 45121603Snjl 46121641Siwasaki#ifndef ACPI_NO_RESET_VIDEO 47121603Snjl /* 48121603Snjl * Re-initialize video BIOS. Restore DS and SS from CS in 49121603Snjl * case the BIOS modified them. 50121603Snjl */ 51121603Snjl lcall $0xc000, $3 52121603Snjl movw %cs, %ax 53121603Snjl movw %ax, %ds 54121603Snjl movw %ax, %ss 55121641Siwasaki#endif 5680028Stakawata 5780028Stakawata /* Load GDT for real mode */ 5880028Stakawata lgdt physical_gdt 5980028Stakawata 6080028Stakawata /* Restore CR2, CR3 and CR4 */ 6180028Stakawata mov previous_cr2,%eax 6280028Stakawata mov %eax,%cr2 6380028Stakawata mov previous_cr3,%eax 6480028Stakawata mov %eax,%cr3 6580028Stakawata mov previous_cr4,%eax 6680028Stakawata mov %eax,%cr4 6780028Stakawata 6880028Stakawata /* Transfer some values to protected mode */ 6980028Stakawata#define NVALUES 9 7080028Stakawata#define TRANSFER_STACK32(val, idx) \ 7180028Stakawata mov val,%eax; \ 7280028Stakawata mov %eax,wakeup_32stack+(idx+1)+(idx*4); 7380028Stakawata 7480028Stakawata TRANSFER_STACK32(previous_ss, (NVALUES - 9)) 7580028Stakawata TRANSFER_STACK32(previous_fs, (NVALUES - 8)) 7680028Stakawata TRANSFER_STACK32(previous_ds, (NVALUES - 7)) 7780028Stakawata TRANSFER_STACK32(physical_gdt+2, (NVALUES - 6)) 7880028Stakawata TRANSFER_STACK32(where_to_recover, (NVALUES - 5)) 7980028Stakawata TRANSFER_STACK32(previous_idt+2, (NVALUES - 4)) 8080028Stakawata TRANSFER_STACK32(previous_ldt, (NVALUES - 3)) 8180028Stakawata TRANSFER_STACK32(previous_gdt+2, (NVALUES - 2)) 8280028Stakawata TRANSFER_STACK32(previous_tr, (NVALUES - 1)) 8380028Stakawata TRANSFER_STACK32(previous_cr0, (NVALUES - 0)) 8480028Stakawata 8580028Stakawata mov physical_esp,%esi /* to be used in 32bit code */ 8680028Stakawata 8780028Stakawata /* Enable protected mode */ 8880028Stakawata mov %cr0,%eax 8980028Stakawata orl $(CR0_PE),%eax 9080028Stakawata mov %eax,%cr0 9180028Stakawata 9280028Stakawatawakeup_sw32: 9380028Stakawata /* Switch to protected mode by intersegmental jump */ 9480028Stakawata ljmpl $0x8,$0x12345678 /* Code location, to be replaced */ 9580028Stakawata 9680028Stakawata .code32 9780028Stakawatawakeup_32: 9880028Stakawata /* 9980028Stakawata * Switched to protected mode w/o paging 10080028Stakawata * %esi: KERNEL stack pointer (physical address) 10180028Stakawata */ 10280028Stakawata 10380028Stakawata nop 10480028Stakawata 10580028Stakawata /* Set up segment registers for protected mode */ 10680028Stakawata movw $0x10,%ax /* KDSEL to segment registers */ 10780028Stakawata movw %ax,%ds 10880028Stakawata movw %ax,%es 10980028Stakawata movw %ax,%gs 11080028Stakawata movw %ax,%ss 11180028Stakawata movw $0x18,%ax /* KPSEL to %fs */ 11280028Stakawata movw %ax,%fs 11380028Stakawata movl %esi,%esp /* physical address stack pointer */ 11480028Stakawata 11580028Stakawatawakeup_32stack: 11680028Stakawata /* Operands are overwritten in 16bit code */ 11780028Stakawata pushl $0xabcdef09 /* ss + dummy */ 11880028Stakawata pushl $0xabcdef08 /* fs + gs */ 11980028Stakawata pushl $0xabcdef07 /* ds + es */ 12080028Stakawata pushl $0xabcdef06 /* gdt:base (physical address) */ 12180028Stakawata pushl $0xabcdef05 /* recover address */ 12280028Stakawata pushl $0xabcdef04 /* idt:base */ 12380028Stakawata pushl $0xabcdef03 /* ldt + idt:limit */ 12480028Stakawata pushl $0xabcdef02 /* gdt:base */ 12580028Stakawata pushl $0xabcdef01 /* TR + gdt:limit */ 12680028Stakawata pushl $0xabcdef00 /* CR0 */ 12780028Stakawata 12880028Stakawata movl %esp,%ebp 12980028Stakawata#define CR0_REGISTER 0(%ebp) 13080028Stakawata#define TASK_REGISTER 4(%ebp) 13180028Stakawata#define PREVIOUS_GDT 6(%ebp) 13280028Stakawata#define PREVIOUS_LDT 12(%ebp) 13380028Stakawata#define PREVIOUS_IDT 14(%ebp) 13480028Stakawata#define RECOVER_ADDR 20(%ebp) 13580028Stakawata#define PHYSICAL_GDT_BASE 24(%ebp) 13680028Stakawata#define PREVIOUS_DS 28(%ebp) 13780028Stakawata#define PREVIOUS_ES 30(%ebp) 13880028Stakawata#define PREVIOUS_FS 32(%ebp) 13980028Stakawata#define PREVIOUS_GS 34(%ebp) 14080028Stakawata#define PREVIOUS_SS 36(%ebp) 14180028Stakawata 14280028Stakawata /* Fixup TSS type field */ 14380028Stakawata#define TSS_TYPEFIX_MASK 0xf9 14480028Stakawata xorl %esi,%esi 14580028Stakawata movl PHYSICAL_GDT_BASE,%ebx 14680028Stakawata movw TASK_REGISTER,%si 14780028Stakawata leal (%ebx,%esi),%eax /* get TSS segment descriptor */ 14880028Stakawata andb $TSS_TYPEFIX_MASK,5(%eax) 14980028Stakawata 15080028Stakawata /* Prepare to return to sleep/wakeup code point */ 15180028Stakawata lgdt PREVIOUS_GDT 15280028Stakawata lidt PREVIOUS_IDT 15380028Stakawata 15480028Stakawata xorl %eax,%eax 15580028Stakawata movl %eax,%ebx 15680028Stakawata movl %eax,%ecx 15780028Stakawata movl %eax,%edx 15880028Stakawata movl %eax,%esi 15980028Stakawata movl %eax,%edi 16080028Stakawata movl PREVIOUS_DS,%ebx 16180028Stakawata movl PREVIOUS_FS,%ecx 16280028Stakawata movl PREVIOUS_SS,%edx 16380028Stakawata movw TASK_REGISTER,%si 16480028Stakawata shll $16,%esi 16580028Stakawata movw PREVIOUS_LDT,%si 16680028Stakawata movl RECOVER_ADDR,%edi 16780028Stakawata 16880028Stakawata /* Enable paging and etc. */ 16980028Stakawata movl CR0_REGISTER,%eax 17080028Stakawata movl %eax,%cr0 17180028Stakawata 17280028Stakawata /* Flush the prefetch queue */ 17380028Stakawata jmp 1f 17480028Stakawata1: jmp 1f 17580028Stakawata1: 17680028Stakawata /* 17780028Stakawata * Now that we are in kernel virtual memory addressing 17880028Stakawata * %ebx: ds + es 17980028Stakawata * %ecx: fs + gs 18080028Stakawata * %edx: ss + dummy 18180028Stakawata * %esi: LDTR + TR 18280028Stakawata * %edi: recover address 18380028Stakawata */ 18480028Stakawata 18580028Stakawata nop 18680028Stakawata 18780028Stakawata movl %esi,%eax /* LDTR + TR */ 18880028Stakawata lldt %ax /* load LDT register */ 18980028Stakawata shrl $16,%eax 19080028Stakawata ltr %ax /* load task register */ 19180028Stakawata 19280028Stakawata /* Restore segment registers */ 19380028Stakawata movl %ebx,%eax /* ds + es */ 19480028Stakawata movw %ax,%ds 19580028Stakawata shrl $16,%eax 19680028Stakawata movw %ax,%es 19780028Stakawata movl %ecx,%eax /* fs + gs */ 19880028Stakawata movw %ax,%fs 19980028Stakawata shrl $16,%eax 20080028Stakawata movw %ax,%gs 20180028Stakawata movl %edx,%eax /* ss */ 20280028Stakawata movw %ax,%ss 20380028Stakawata 20480028Stakawata /* Jump to acpi_restorecpu() */ 20580028Stakawata jmp *%edi 20680028Stakawata 20780028Stakawata/* used in real mode */ 20880028Stakawataphysical_gdt: .word 0 20980028Stakawata .long 0 21080028Stakawataphysical_esp: .long 0 21180028Stakawataprevious_cr2: .long 0 21280028Stakawataprevious_cr3: .long 0 21380028Stakawataprevious_cr4: .long 0 21480028Stakawata 21580028Stakawata/* transfer from real mode to protected mode */ 21680028Stakawataprevious_cr0: .long 0 21780028Stakawataprevious_tr: .word 0 21880028Stakawataprevious_gdt: .word 0 21980028Stakawata .long 0 22080028Stakawataprevious_ldt: .word 0 22180028Stakawataprevious_idt: .word 0 22280028Stakawata .long 0 22380028Stakawatawhere_to_recover: .long 0 22480028Stakawataprevious_ds: .word 0 22580028Stakawataprevious_es: .word 0 22680028Stakawataprevious_fs: .word 0 22780028Stakawataprevious_gs: .word 0 22880028Stakawataprevious_ss: .word 0 22980028Stakawatadummy: .word 0 230