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/* ----------------------------------------------------------------------- *
*
* Copyright 2008 rPath, Inc. - All Rights Reserved
* Copyright 2010 Intel Corporation; author: H. Peter Anvin
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/*
* Stub to work around Grub, or other loaders which can't load directly
* into low memory. This code needs four parameters which should
* immediately precede it: source of code to be copied, target of code
* to be copied, length of code to be copied, post-copy entry point.
*/
/* Parameters */
.section ".startupinfo","a",@progbits
mv_entry: .long 0
mv_move: .long 0, 0, 0 /* Setup code */
.long 0, 0, 0 /* zImage kernel code */
.long 0, 0, 0 /* Null terminator */
/* We will be entered in flat 32-bit protected mode... */
.section ".start","ax",@progbits
.globl _start
.code32
_start:
call 1f
1: pushfl
pushl %ecx
pushl %ebx
pushl %esi
pushl %edi
movl (5*4)(%esp), %ebx
subl $1b, %ebx
movl mv_entry(%ebx), %ecx
movl %ecx, (5*4)(%esp) /* Where to go next */
addl $mv_move, %ebx
2:
movl (%ebx), %edi
movl 4(%ebx), %esi
movl 8(%ebx), %ecx
addl $3, %ecx
shrl $2, %ecx
jz 3f /* Zero length = we're done */
cld
rep ; movsl
addl $12, %ebx
jmp 2b
3:
popl %edi
popl %esi
popl %ebx
popl %ecx
popfl
retl /* Goes to the entry point */
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