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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2002 Linux Networx
* (Written by Eric Biederman <ebiederman@lnxi.com> for Linux Networx)
* Copyright (C) 2004 Ollie Lo
* Copyright (C) 2005 YingHai Lu
* Copyright (C) Copyright (C) 2005-2007 Stefan Reinauer <stepan@openbios.org>
* Copyright (C) 2009 Ronald G. Minnich <rminnich@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA, 02110-1301 USA
*/
.text
.globl _secondary_start, _secondary_start_end
_secondary_start:
1:
.code16
.balign 4096
cli
movw $0xdead, 0
movw $0xbeef, 2
xorl %eax, %eax
movl %eax, %cr3 /* Invalidate TLB*/
/* On hyper threaded cpus, invalidating the cache here is
* very very bad. Don't.
*/
movw $0, 0
movl $1b, %ebx
movw $1, 0
movw $2, 0
/* setup the data segment */
movw %cs, %ax
movw %ax, 2
movw $3, 0
movw %ax, %ds
movw $4, 0
/* past this point, "0" means ds:0, i.e. cs:0, or the
* segment part of the address.
*/
data32 lgdt gdtaddr - _secondary_start
// data32 lgdt %cs:gdtptr
movw $5, 0
movl %cr0, %eax
movw $6, 0
andl $0x7FFAFFD1, %eax /* PG,AM,WP,NE,TS,EM,MP = 0 */
movw $7, 0
orl $0x60000001, %eax /* CD, NW, PE = 1 */
movw $8, 0
movl %eax, %cr0
movw $9, 0
hlt
/* tested to this point but not past it */
/* I am pretty sure this just jumps back into
* ROM; it's an abs jump
*/
data32 ljmp $0x10, $secondary32
movw $0xa, 0
1:
.code32
secondary32:
hlt
movw $0x18, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %ss
movw %ax, %fs
movw %ax, %gs
/* Load the Interrupt descriptor table */
lidt idtarg
/* Set the stack pointer */
movl -4(%ebx),%esp
movl $0, -4(%ebx)
call secondary_cpu_init
1: hlt
jmp 1b
.align 4
gdt_limit = gdt_end - gdt - 1 /* Compute the table limit. */
gdt:
gdtptr:
.word gdt_end - gdt -1 /* Compute the table limit. */
.long gdt /* We know the offset. */
.word 0
/* selgdt 0x08, flat code segment */
.word 0xffff, 0x0000
.byte 0x00, 0x9b, 0xcf, 0x00
/* selgdt 0x10, flat data segment */
.word 0xffff, 0x0000
.byte 0x00, 0x93, 0xcf, 0x00
/* selgdt 0x18, flat code segment for CAR */
.word 0xffff, 0x0000
.byte 0x00, 0x9b, 0xcf, 0x00
/* selgdt 0x20, flat data segment for CAR */
.word 0xffff, 0x0000
.byte 0x00, 0x93, 0xcf, 0x00
gdt_end:
gdtaddr:
.word gdt_limit /* the table limit */
.long gdt /* we know the offset */
idtarg:
.word _idt_end - _idt - 1 /* limit */
.long _idt
.word 0
_idt:
.fill 20, 8, 0 # idt is unitiailzed
_idt_end:
_secondary_start_end:
.code32
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