2002-11-18 09:14:45 +09:00
|
|
|
|
/*
|
2003-06-28 06:31:46 +09:00
|
|
|
|
* U-boot - i386 Startup Code
|
2002-11-18 09:14:45 +09:00
|
|
|
|
*
|
2010-10-07 18:03:27 +09:00
|
|
|
|
* Copyright (c) 2002 Omicron Ceti AB, Daniel Engstr<EFBFBD>m <denaiel@omicron.se>
|
2002-11-18 09:14:45 +09:00
|
|
|
|
*
|
|
|
|
|
* See file CREDITS for list of people who contributed to this
|
|
|
|
|
* 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; either version 2 of
|
|
|
|
|
* the License, or (at your option) any later version.
|
|
|
|
|
*
|
|
|
|
|
* 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., 59 Temple Place, Suite 330, Boston,
|
|
|
|
|
* MA 02111-1307 USA
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
#include <config.h>
|
|
|
|
|
#include <version.h>
|
2010-10-07 18:03:29 +09:00
|
|
|
|
#include <asm/global_data.h>
|
2002-11-18 09:14:45 +09:00
|
|
|
|
|
2003-06-28 06:31:46 +09:00
|
|
|
|
|
2002-11-18 09:14:45 +09:00
|
|
|
|
.section .text
|
|
|
|
|
.code32
|
|
|
|
|
.globl _start
|
2003-06-28 06:31:46 +09:00
|
|
|
|
.type _start, @function
|
2002-11-18 09:14:45 +09:00
|
|
|
|
.globl _i386boot_start
|
|
|
|
|
_i386boot_start:
|
2010-04-23 23:05:42 +09:00
|
|
|
|
/*
|
|
|
|
|
* This is the fail safe 32-bit bootstrap entry point. The
|
|
|
|
|
* following code is not executed from a cold-reset (actually, a
|
|
|
|
|
* lot of it is, but from real-mode after cold reset. It is
|
|
|
|
|
* repeated here to put the board into a state as close to cold
|
|
|
|
|
* reset as necessary)
|
|
|
|
|
*/
|
|
|
|
|
cli
|
|
|
|
|
cld
|
|
|
|
|
|
|
|
|
|
/* Turn of cache (this might require a 486-class CPU) */
|
|
|
|
|
movl %cr0, %eax
|
2010-10-07 18:03:21 +09:00
|
|
|
|
orl $0x60000000, %eax
|
2010-04-23 23:05:42 +09:00
|
|
|
|
movl %eax, %cr0
|
|
|
|
|
wbinvd
|
|
|
|
|
|
|
|
|
|
/* Tell 32-bit code it is being entered from an in-RAM copy */
|
|
|
|
|
movw $0x0000, %bx
|
2003-06-28 06:31:46 +09:00
|
|
|
|
_start:
|
2010-04-23 23:05:42 +09:00
|
|
|
|
/* This is the 32-bit cold-reset entry point */
|
|
|
|
|
|
2010-10-07 18:03:21 +09:00
|
|
|
|
movl $0x18, %eax /* Load our segement registes, the
|
2008-05-20 23:00:29 +09:00
|
|
|
|
* gdt have already been loaded by start16.S */
|
2010-10-07 18:03:21 +09:00
|
|
|
|
movw %ax, %fs
|
|
|
|
|
movw %ax, %ds
|
|
|
|
|
movw %ax, %gs
|
|
|
|
|
movw %ax, %es
|
|
|
|
|
movw %ax, %ss
|
2003-06-28 06:31:46 +09:00
|
|
|
|
|
2010-04-23 23:05:42 +09:00
|
|
|
|
/* Clear the interupt vectors */
|
|
|
|
|
lidt blank_idt_ptr
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Skip low-level board and memory initialization if not starting
|
|
|
|
|
* from cold-reset. This allows us to do a fail safe boot-strap
|
|
|
|
|
* into a new build of U-Boot from a known-good boot flash
|
|
|
|
|
*/
|
|
|
|
|
movw $0x0001, %ax
|
|
|
|
|
cmpw %ax, %bx
|
|
|
|
|
jne mem_init_ret
|
|
|
|
|
|
2002-11-18 09:14:45 +09:00
|
|
|
|
/* We call a few functions in the board support package
|
|
|
|
|
* since we have no stack yet we'll have to use %ebp
|
|
|
|
|
* to store the return address */
|
2003-06-28 06:31:46 +09:00
|
|
|
|
|
2002-11-18 09:14:45 +09:00
|
|
|
|
/* Early platform init (setup gpio, etc ) */
|
|
|
|
|
jmp early_board_init
|
2010-10-07 18:03:27 +09:00
|
|
|
|
.globl early_board_init_ret
|
2002-11-18 09:14:45 +09:00
|
|
|
|
early_board_init_ret:
|
2003-06-28 06:31:46 +09:00
|
|
|
|
|
2002-11-18 09:14:45 +09:00
|
|
|
|
/* size memory */
|
2010-10-07 18:03:21 +09:00
|
|
|
|
jmp mem_init
|
2010-10-07 18:03:27 +09:00
|
|
|
|
.globl mem_init_ret
|
2002-11-18 09:14:45 +09:00
|
|
|
|
mem_init_ret:
|
2003-06-28 06:31:46 +09:00
|
|
|
|
|
2010-04-23 23:05:41 +09:00
|
|
|
|
/* fetch memory size (into %eax) */
|
2010-10-07 18:03:21 +09:00
|
|
|
|
jmp get_mem_size
|
2010-10-07 18:03:27 +09:00
|
|
|
|
.globl get_mem_size_ret
|
2010-04-23 23:05:41 +09:00
|
|
|
|
get_mem_size_ret:
|
|
|
|
|
|
2010-10-07 18:03:26 +09:00
|
|
|
|
#if CONFIG_SYS_SDRAM_ECC_ENABLE
|
|
|
|
|
/* Skip ECC initialization if not starting from cold-reset */
|
|
|
|
|
movl %ebx, %ecx
|
|
|
|
|
andl $GD_FLG_COLD_BOOT, %ecx
|
|
|
|
|
jz init_ecc_ret
|
|
|
|
|
jmp init_ecc
|
|
|
|
|
|
2010-10-07 18:03:27 +09:00
|
|
|
|
.globl init_ecc_ret
|
2010-10-07 18:03:26 +09:00
|
|
|
|
init_ecc_ret:
|
|
|
|
|
#endif
|
|
|
|
|
|
2009-11-24 18:04:21 +09:00
|
|
|
|
/* Check we have enough memory for stack */
|
|
|
|
|
movl $CONFIG_SYS_STACK_SIZE, %ecx
|
2003-06-28 06:31:46 +09:00
|
|
|
|
cmpl %ecx, %eax
|
2010-10-07 18:03:24 +09:00
|
|
|
|
jb die
|
2003-06-28 06:31:46 +09:00
|
|
|
|
mem_ok:
|
2009-11-24 18:04:21 +09:00
|
|
|
|
/* Set stack pointer to upper memory limit*/
|
2010-10-07 18:03:21 +09:00
|
|
|
|
movl %eax, %esp
|
2002-11-18 09:14:45 +09:00
|
|
|
|
|
2009-11-24 18:04:21 +09:00
|
|
|
|
/* Test the stack */
|
2002-11-18 09:14:45 +09:00
|
|
|
|
pushl $0
|
2010-10-07 18:03:28 +09:00
|
|
|
|
popl %ecx
|
|
|
|
|
cmpl $0, %ecx
|
2010-10-07 18:03:27 +09:00
|
|
|
|
jne die
|
2002-11-18 09:14:45 +09:00
|
|
|
|
push $0x55aa55aa
|
2010-10-07 18:03:28 +09:00
|
|
|
|
popl %ecx
|
|
|
|
|
cmpl $0x55aa55aa, %ecx
|
2010-10-07 18:03:24 +09:00
|
|
|
|
jne die
|
2002-11-18 09:14:45 +09:00
|
|
|
|
|
2003-06-28 06:31:46 +09:00
|
|
|
|
wbinvd
|
2002-11-18 09:14:45 +09:00
|
|
|
|
|
2010-10-07 18:03:23 +09:00
|
|
|
|
/* Set the upper memory limit parameter */
|
|
|
|
|
subl $CONFIG_SYS_STACK_SIZE, %eax
|
2002-11-18 09:14:45 +09:00
|
|
|
|
|
2010-10-07 18:03:29 +09:00
|
|
|
|
/* Reserve space for global data */
|
|
|
|
|
subl $(GD_SIZE * 4), %eax
|
|
|
|
|
|
|
|
|
|
/* %eax points to the global data structure */
|
|
|
|
|
movl %esp, (GD_RAM_SIZE * 4)(%eax)
|
|
|
|
|
movl %ebx, (GD_FLAGS * 4)(%eax)
|
|
|
|
|
|
2009-11-24 18:04:21 +09:00
|
|
|
|
call board_init_f /* Enter, U-boot! */
|
2002-11-18 09:14:45 +09:00
|
|
|
|
|
|
|
|
|
/* indicate (lack of) progress */
|
2003-06-28 06:31:46 +09:00
|
|
|
|
movw $0x85, %ax
|
2002-11-18 09:14:45 +09:00
|
|
|
|
die: hlt
|
|
|
|
|
jmp die
|
2003-06-28 06:31:46 +09:00
|
|
|
|
hlt
|
2010-04-23 23:05:42 +09:00
|
|
|
|
|
|
|
|
|
blank_idt_ptr:
|
|
|
|
|
.word 0 /* limit */
|
|
|
|
|
.long 0 /* base */
|