90 lines
2.4 KiB
ArmAsm
90 lines
2.4 KiB
ArmAsm
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/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2009 Rudolf Marek <r.marek@assembler.cz>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License v2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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.text
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.code32
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.globl acpi_jmp_to_realm_wakeup
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/* This function does the PM -> RM switch, but
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it can run >1MB even in real mode */
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acpi_jmp_to_realm_wakeup:
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mov 0x4(%esp), %eax
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/* last 4 bits of linear addr are taken as offset */
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andw $0x0f, %ax
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movw %ax, (jmp_off)
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mov 0x4(%esp), %eax
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/* the rest is taken as segment */
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shr $4, %eax
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movw %ax, (jmp_seg)
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lgdt gdtaddr_wakeup
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movl $0x008,%eax
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mov %eax,%ds
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movl %eax,%es
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movl %eax,%ss
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movl %eax,%fs
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movl %eax,%gs
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ljmp $0x0010,$reload_cs
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.code16gcc
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reload_cs:
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/* switch off PE */
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movl %cr0, %eax
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andb $0xfe,%al
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movl %eax, %cr0
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movw $0x0, %ax
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movw %ax, %ds
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movw %ax, %es
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movw %ax, %ss
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movw %ax, %fs
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movw %ax, %gs
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/* far jump to OS waking vector. The linear addr is changed to SEG and OFFSET
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check ACPI specs or above code for details */
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.byte 0xea
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jmp_off:
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.word 0
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jmp_seg:
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.word 0
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.code32
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gdt_wakeup_limit = gdt_wakeup_end - gdt_wakeup - 1 /* compute the table limit */
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gdtaddr_wakeup:
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.word gdt_wakeup_limit /* the table limit */
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.long gdt_wakeup /* we know the offset */
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.data
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/* This is the gdt for GCC part of coreboot.
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* It is different from the gdt in ROMCC/ASM part of coreboot
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* which is defined in entry32.inc */
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gdt_wakeup:
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/* selgdt 0, unused */
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.word 0x0000, 0x0000 /* dummy */
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.byte 0x00, 0x00, 0x00, 0x00
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/* selgdt 8, flat data segment 16bit */
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.word 0x0000, 0x0000 /* dummy */
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.byte 0x00, 0x93, 0x8f, 0x00 /* G=1 and 0x0f, So we get 4Gbytes for limit */
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/* selgdt 0x10, flat code segment 16bit */
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.word 0xffff, 0x0000
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.byte 0x00, 0x9b, 0x8f, 0x00 /* G=1 and 0x0f, So we get 4Gbytes for limit */
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gdt_wakeup_end:
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.previous
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.code32
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