/* $NetBSD: srt0.s,v 1.4 2014/08/06 15:23:07 joerg Exp $ */
/*-
* Copyright (C) 1995-1997 Gary Thomas (
[email protected])
* All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Gary Thomas.
* 4. 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 ``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 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.
*/
#define MSR_EE 0x8000
.text
/*
* This code is loaded by the ROM loader at location 0x3100.
* Move it to high memory so that it can load the kernel at 0x0000.
*/
#define PEF_LOAD_ADDRESS 0x3100
.globl _start
_start:
mfmsr 3 /* Turn off interrupts */
li 4,0x3002
li 4,0
ori 4,4,MSR_EE
andc 3,3,4
mtmsr 3
bl whichCPU
cmpwi %r3,0
bne 90f
/* CPU 0 runs here */
/* Relocate code to final resting spot */
li 3,PEF_LOAD_ADDRESS
lis 4,_start@h
ori 4,4,_start@l
lis 5,edata@h
ori 5,5,edata@l
addi 5,5,3 /* Round up - just in case */
sub 5,5,4 /* Compute # longwords to move */
srwi 5,5,2
mtctr 5
subi 3,3,4 /* Set up for loop */
subi 4,4,4
00: lwzu 5,4(3)
stwu 5,4(4)
bdnz 00b
lis 3,start_ldr@h
ori 3,3,start_ldr@l
mtlr 3 /* Easiest way to do an absolute jump */
blr
start_ldr:
/* Clear all of BSS */
lis 3,edata@h
ori 3,3,edata@l
lis 4,end@h
ori 4,4,end@l
subi 3,3,4
subi 4,4,4
li 0,0
50: stwu 0,4(3)
cmpw %r3,%r4
bne 50b
90:
bl main
hang:
b hang
/*
* end address
*/
.globl endaddr
endaddr:
lis 3,end@h
ori 3,3,end@l
lis 4,_start@h
ori 4,4,_start@l
sub 3,3,4
blr
/*
* Execute
* run(startsym, endsym, args, bootinfo, entry)
*/
.globl run
run:
mtctr 7 /* Entry point */
bctr
