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/*
* This file is part of the coreboot project.
*
* Copyright 2015 Google Inc
*
* 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.
*/
#define LHLT_DELAY 0x50000 /* I/O delay between post codes on failure */
.text
.global _start
_start:
/* This is the romstage entry point when CONFIG_SEPARATE_VERSTAGE
* is used. The stack, descriptors, and gdt are already initialized
* by verstage. However, in order to maintain the semantics of
* CAR_GLOBAL variables we need to clear those to zero. */
cld
xor %eax, %eax
movl $(_car_global_end), %ecx
movl $(_car_global_start), %edi
sub %edi, %ecx
rep stosl
call romstage_after_verstage
#include "after_raminit.S"
movb $0x69, %ah
jmp .Lhlt
.Lhlt:
xchg %al, %ah
#if IS_ENABLED(CONFIG_POST_IO)
outb %al, $CONFIG_POST_IO_PORT
#else
post_code(POST_DEAD_CODE)
#endif
movl $LHLT_DELAY, %ecx
.Lhlt_Delay:
outb %al, $0xED
loop .Lhlt_Delay
jmp .Lhlt
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