102 lines
2.8 KiB
ArmAsm
102 lines
2.8 KiB
ArmAsm
/*
|
|
* This file is part of the libpayload project.
|
|
*
|
|
* Copyright (C) 2008 Advanced Micro Devices, Inc.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
.code32
|
|
.global _entry
|
|
.text
|
|
.align 4
|
|
|
|
/*
|
|
* Our entry point - assume that the CPU is in 32 bit protected mode and
|
|
* all segments are in a flat model. That's our operating mode, so we won't
|
|
* change anything.
|
|
*/
|
|
_entry:
|
|
jmp _init
|
|
|
|
.align 4
|
|
|
|
#define MB_MAGIC 0x1BADB002
|
|
#define MB_FLAGS 0x00010003
|
|
|
|
mb_header:
|
|
.long MB_MAGIC
|
|
.long MB_FLAGS
|
|
.long -(MB_MAGIC + MB_FLAGS)
|
|
.long mb_header
|
|
.long _start
|
|
.long _edata
|
|
.long _end
|
|
.long _init
|
|
|
|
#define CB_MAGIC_VALUE 0x12345678
|
|
#define CB_MAGIC 0x04
|
|
#define CB_ARGV 0x08
|
|
#define CB_ARGC 0x10
|
|
|
|
/*
|
|
* This function saves off the previous stack and switches us to our
|
|
* own execution environment.
|
|
*/
|
|
_init:
|
|
/* No interrupts, please. */
|
|
cli
|
|
|
|
/* Store EAX and EBX */
|
|
movl %eax, loader_eax
|
|
movl %ebx, loader_ebx
|
|
|
|
/* Copy argv[] and argc as demanded by the Payload API,
|
|
* see http://www.coreboot.org/Payload_API and exec.S.
|
|
*/
|
|
cmpl $CB_MAGIC_VALUE, CB_MAGIC(%esp)
|
|
jne 1f
|
|
|
|
movl CB_ARGV(%esp), %eax
|
|
movl %eax, main_argv
|
|
|
|
movl CB_ARGC(%esp), %eax
|
|
movl %eax, main_argc
|
|
1:
|
|
/* Store current stack pointer and set up new stack. */
|
|
movl %esp, %eax
|
|
movl $_stack, %esp
|
|
pushl %eax
|
|
|
|
/* Let's rock. */
|
|
call start_main
|
|
|
|
/* %eax has the return value - pass it on unmolested */
|
|
_leave:
|
|
/* Restore old stack. */
|
|
popl %esp
|
|
|
|
/* Return to the original context. */
|
|
ret
|