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/* -*- asm -*-
* $ $
*
*/
/*
* Copyright (C) 1996-2002 Markus Franz Xaver Johannes Oberhumer
*
* This file 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; either version 2 of
* the License, or (at your option) any later version.
*
* Originally this code was part of ucl the data compression library
* for upx the ``Ultimate Packer of eXecutables''.
*
* - Converted to gas assembly, and refitted to work with etherboot.
* Eric Biederman 20 Aug 2002
* - Merged the nrv2b decompressor into crt0.base of coreboot
* Eric Biederman 26 Sept 2002
*/
#include <arch/asm.h>
#include <arch/intel.h>
#include <console/loglevel.h>
#ifndef ASM_CONSOLE_LOGLEVEL
#define ASM_CONSOLE_LOGLEVEL CONFIG_MAXIMUM_CONSOLE_LOGLEVEL
#endif
/*
* This is the entry code the code in .reset section
* jumps to this address.
*
*/
.section ".rom.data", "a", @progbits
.section ".rom.text", "ax", @progbits
post_code(0x01) /* delay for chipsets */
#include "crt0_includes.h"
#if CONFIG_USE_DCACHE_RAM == 0
#ifndef CONSOLE_DEBUG_TX_STRING
/* uses: esp, ebx, ax, dx */
# define __CRT_CONSOLE_TX_STRING(string) \
mov string, %ebx ; \
CALLSP(crt_console_tx_string)
# if defined(CONFIG_TTYS0_BASE) && (ASM_CONSOLE_LOGLEVEL > BIOS_DEBUG)
# define CONSOLE_DEBUG_TX_STRING(string) __CRT_CONSOLE_TX_STRING(string)
# else
# define CONSOLE_DEBUG_TX_STRING(string)
# endif
#endif
/* clear boot_complete flag */
xorl %ebp, %ebp
__main:
CONSOLE_DEBUG_TX_STRING($str_copying_to_ram)
/*
* Copy data into RAM and clear the BSS. Since these segments
* isn\'t really that big we just copy/clear using bytes, not
* double words.
*/
post_code(0x11) /* post 11 */
cld /* clear direction flag */
/* copy coreboot from it's initial load location to
* the location it is compiled to run at.
* Normally this is copying from FLASH ROM to RAM.
*/
movl %ebp, %esi
/* FIXME: look for a proper place for the stack */
movl $0x4000000, %esp
movl %esp, %ebp
pushl %esi
pushl $str_coreboot_ram_name
call cbfs_and_run_core
.Lhlt:
post_code(0xee) /* post fe */
hlt
jmp .Lhlt
#ifdef __CRT_CONSOLE_TX_STRING
/* Uses esp, ebx, ax, dx */
crt_console_tx_string:
mov (%ebx), %al
inc %ebx
cmp $0, %al
jne 9f
RETSP
9:
/* Base Address */
#ifndef CONFIG_TTYS0_BASE
#define CONFIG_TTYS0_BASE 0x3f8
#endif
/* Data */
#define TTYS0_RBR (CONFIG_TTYS0_BASE+0x00)
/* Control */
#define TTYS0_TBR TTYS0_RBR
#define TTYS0_IER (CONFIG_TTYS0_BASE+0x01)
#define TTYS0_IIR (CONFIG_TTYS0_BASE+0x02)
#define TTYS0_FCR TTYS0_IIR
#define TTYS0_LCR (CONFIG_TTYS0_BASE+0x03)
#define TTYS0_MCR (CONFIG_TTYS0_BASE+0x04)
#define TTYS0_DLL TTYS0_RBR
#define TTYS0_DLM TTYS0_IER
/* Status */
#define TTYS0_LSR (CONFIG_TTYS0_BASE+0x05)
#define TTYS0_MSR (CONFIG_TTYS0_BASE+0x06)
#define TTYS0_SCR (CONFIG_TTYS0_BASE+0x07)
mov %al, %ah
10: mov $TTYS0_LSR, %dx
inb %dx, %al
test $0x20, %al
je 10b
mov $TTYS0_TBR, %dx
mov %ah, %al
outb %al, %dx
jmp crt_console_tx_string
#endif /* __CRT_CONSOLE_TX_STRING */
#if defined(CONSOLE_DEBUG_TX_STRING) && (ASM_CONSOLE_LOGLEVEL > BIOS_DEBUG)
.section ".rom.data"
#if CONFIG_COMPRESS
str_copying_to_ram: .string "Uncompressing coreboot to RAM.\r\n"
#else
str_copying_to_ram: .string "Copying coreboot to RAM.\r\n"
#endif
str_pre_main: .string "Jumping to coreboot.\r\n"
.previous
#endif /* ASM_CONSOLE_LOGLEVEL > BIOS_DEBUG */
str_coreboot_ram_name: .ascii CONFIG_CBFS_PREFIX
.string "/coreboot_ram"
#endif /* CONFIG_USE_DCACHE_RAM */
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