d385ed29b9
process. The PPC support is still stubbed, with commented out x86 code as guide line for an implementor. Signed-off-by: Patrick Georgi <patrick.georgi@coresystems.de> Acked-by: Stefan Reinauer <stepan@coresystems.de> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@4293 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
88 lines
2.4 KiB
ArmAsm
88 lines
2.4 KiB
ArmAsm
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2008 Advanced Micro Devices, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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.globl _entry, _leave
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.text
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.align 4
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/*
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* Our entry point - assume that the CPU is in 32 bit protected mode and
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* all segments are in a flat model. That's our operating mode, so we won't
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* change anything.
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*/
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_entry:
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#if 0
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call _init
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/* We're back - go back to the bootloader. */
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ret
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.align 4
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/*
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* This function saves off the previous stack and switches us to our
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* own execution environment.
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*/
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_init:
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/* No interrupts, please. */
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cli
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/* Store current stack pointer. */
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movl %esp, %esi
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/* Store EAX and EBX */
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movl %eax,loader_eax
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movl %ebx,loader_ebx
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/* Setup new stack. */
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movl $_stack, %ebx
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movl %ebx, %esp
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/* Save old stack pointer. */
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pushl %esi
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/* Let's rock. */
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call start_main
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#endif
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/* %eax has the return value - pass it on unmolested */
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_leave:
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#if 0
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/* Get old stack pointer. */
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popl %ebx
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/* Restore old stack. */
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movl %ebx, %esp
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/* Return to the original context. */
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ret
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#endif
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