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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2000,2007 Ronald G. Minnich <rminnich@gmail.com>
* Copyright (C) 2007-2008 coresystems GmbH
* Copyright (C) 2013-2014 Sage Electronic Engineering, LLC.
*
* 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/cache.h>
#include <cpu/x86/post_code.h>
#include <cbmem.h>
#ifndef CONFIG_FSP_LOC
# error "CONFIG_FSP_LOC must be set."
#endif
cmp $0, %eax
je cache_as_ram
mov $0xa0, %eax
jmp .Lhlt
cache_as_ram:
post_code(0x20)
/*
* Find the FSP binary in cbfs.
* Make a fake stack that has the return value back to this code.
*/
lea fake_fsp_stack, %esp
jmp find_fsp
find_fsp_ret:
/* Save the FSP location */
mov %eax, %ebp
cmp $CONFIG_FSP_LOC, %eax
jae find_fsp_ok
mov $0xb0, %eax
jmp .Lhlt
find_fsp_ok:
post_code(0x22)
/* Calculate entry into FSP */
mov 0x30(%ebp), %eax /* Load TempRamInitEntry */
add 0x1c(%ebp), %eax /* add in the offset for the FSP base address */
/*
* Pass early init variables on a fake stack (no memory yet)
* as well as the return location
*/
lea CAR_init_stack, %esp
/* call FSP binary to setup temporary stack */
jmp *%eax
CAR_init_done:
addl $4, %esp
cmp $0, %eax
je car_init_ok
add $0xc0, %eax
jmp .Lhlt
car_init_ok:
/* Save FSP_INFO_HEADER location in ebx */
mov %ebp, %ebx
/*
* set up bootloader stack
* ecx: stack base
* edx: stack top
*/
mov %edx, %esp
movl %esp, %ebp
/* Clear the cbmem CAR memory region. */
movl %ecx, %edi
movl %edx, %ecx
sub %edi, %ecx
shr $2, %ecx
xorl %eax, %eax
rep stosl
before_romstage:
post_code(0x23)
/* Call romstage.c main function. */
pushl %ebx /* main takes FSP_INFO_HEADER as its argument */
call main /* does not return */
movb $0xB8, %ah
jmp .Lhlt
.Lhlt:
#if IS_ENABLED(CONFIG_POST_IO)
outb %al, $CONFIG_POST_IO_PORT
#endif
hlt
jmp .Lhlt
/*
* esp is set to this location so that the call into and return from the FSP
* in find_fsp will work.
*/
.align 4
fake_fsp_stack:
.long find_fsp_ret
CAR_init_params:
.long dummy_microcode
.long 0
.long 0xFFFFFFFF - CACHE_ROM_SIZE + 1 /* Firmware Location */
.long CACHE_ROM_SIZE /* Total Firmware Length */
CAR_init_stack:
.long CAR_init_done
.long CAR_init_params
dummy_microcode:
.long 0
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