/* * U-boot - i386 Startup Code * * Copyright (c) 2002 Omicron Ceti AB, Daniel Engstr�m <denaiel@omicron.se> * * 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> .section .text .code32 .globl _start .type _start, @function .globl _i386boot_start _i386boot_start: _start: movl $0x18,%eax /* Load our segement registes, the * gdt have already been loaded by start16.S */ movw %ax,%fs movw %ax,%ds movw %ax,%gs movw %ax,%es movw %ax,%ss /* 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 */ /* Early platform init (setup gpio, etc ) */ mov $early_board_init_ret, %ebp jmp early_board_init early_board_init_ret: /* The __port80 entry-point should be usabe by now */ /* so we try to indicate progress */ movw $0x01, %ax movl $.progress0, %ebp jmp show_boot_progress_asm .progress0: /* size memory */ mov $mem_init_ret, %ebp jmp mem_init mem_init_ret: /* Check we have enough memory for stack */ movl $CONFIG_SYS_STACK_SIZE, %ecx cmpl %ecx, %eax jae mem_ok /* indicate (lack of) progress */ movw $0x81, %ax movl $.progress0a, %ebp jmp show_boot_progress_asm .progress0a: jmp die mem_ok: /* Set stack pointer to upper memory limit*/ movl %eax, %esp /* indicate progress */ movw $0x02, %ax movl $.progress1, %ebp jmp show_boot_progress_asm .progress1: /* Test the stack */ pushl $0 popl %eax cmpl $0, %eax jne no_stack push $0x55aa55aa popl %ebx cmpl $0x55aa55aa, %ebx je stack_ok no_stack: /* indicate (lack of) progress */ movw $0x82, %ax movl $.progress1a, %ebp jmp show_boot_progress_asm .progress1a: jmp die stack_ok: /* indicate progress */ movw $0x03, %ax movl $.progress2, %ebp jmp show_boot_progress_asm .progress2: wbinvd /* Get upper memory limit */ movl %esp, %ecx subl $CONFIG_SYS_STACK_SIZE, %ecx /* Create a Stack Frame */ pushl %ebp movl %esp, %ebp /* stack_limit parameter */ pushl %ecx call board_init_f /* Enter, U-boot! */ /* indicate (lack of) progress */ movw $0x85, %ax movl $.progress4a, %ebp jmp show_boot_progress_asm .progress4a: die: hlt jmp die hlt