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/*
* This file is part of the coreboot project.
*
* 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.
*/
#include <cpu/x86/mtrr.h>
#include <cpu/x86/lapic_def.h>
#if IS_ENABLED(CONFIG_SMP) && CONFIG_MAX_CPUS > 1
.text
.globl _secondary_start, _secondary_start_end, _secondary_gdt_addr
.balign 4096
_secondary_start:
.code16
cli
xorl %eax, %eax
movl %eax, %cr3 /* Invalidate TLB*/
/* On hyper threaded cpus, invalidating the cache here is
* very very bad. Don't.
*/
/* setup the data segment */
movw %cs, %ax
movw %ax, %ds
data32 lgdt gdtaddr - _secondary_start
movl %cr0, %eax
andl $0x7FFAFFD1, %eax /* PG,AM,WP,NE,TS,EM,MP = 0 */
orl $0x60000001, %eax /* CD, NW, PE = 1 */
movl %eax, %cr0
ljmpl $0x10, $__ap_protected_start
/* This will get filled in by C code. */
_secondary_gdt_addr:
gdtaddr:
.word 0 /* the table limit */
.long 0 /* we know the offset */
_secondary_start_end:
ap_protected_start:
.code32
lgdt gdtaddr
ljmpl $0x10, $__ap_protected_start
__ap_protected_start:
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, and flag that we are done */
xorl %eax, %eax
movl secondary_stack, %esp
andl $0xfffffff0, %esp
sub $12, %esp /* maintain 16-byte alignment for the call below */
movl secondary_cpu_index, %edi
pushl %edi
movl %eax, secondary_stack
call secondary_cpu_init
1: hlt
jmp 1b
.code32
#endif
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