111 lines
2.9 KiB
ArmAsm
111 lines
2.9 KiB
ArmAsm
/* $NetBSD: srt0.s,v 1.3 1999/06/28 01:20:45 sakamoto Exp $ */
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/*-
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* Copyright (C) 1995-1997 Gary Thomas (gdt@linuxppc.org)
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* All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Gary Thomas.
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* 4. 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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#define MSR_EE 0x8000
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.text
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/*
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* This code is loaded by the ROM loader at location 0x3100.
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* Move it to high memory so that it can load the kernel at 0x0000.
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*/
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#define PEF_LOAD_ADDRESS 0x3100
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.globl _start
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_start:
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mfmsr 3 /* Turn off interrupts */
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li 4,0x3002
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li 4,0
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ori 4,4,MSR_EE
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andc 3,3,4
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mtmsr 3
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bl whichCPU
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cmpi 0,3,0
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bne 90f
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/* CPU 0 runs here */
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/* Relocate code to final resting spot */
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li 3,PEF_LOAD_ADDRESS
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lis 4,_start@h
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ori 4,4,_start@l
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lis 5,edata@h
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ori 5,5,edata@l
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addi 5,5,3 /* Round up - just in case */
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sub 5,5,4 /* Compute # longwords to move */
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srwi 5,5,2
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mtctr 5
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subi 3,3,4 /* Set up for loop */
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subi 4,4,4
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00: lwzu 5,4(3)
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stwu 5,4(4)
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bdnz 00b
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lis 3,start_ldr@h
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ori 3,3,start_ldr@l
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mtlr 3 /* Easiest way to do an absolute jump */
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blr
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start_ldr:
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/* Clear all of BSS */
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lis 3,edata@h
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ori 3,3,edata@l
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lis 4,end@h
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ori 4,4,end@l
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subi 3,3,4
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subi 4,4,4
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li 0,0
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50: stwu 0,4(3)
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cmp 0,3,4
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bne 50b
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90:
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bl main
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hang:
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b hang
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/*
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* end address
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*/
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.globl endaddr
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endaddr:
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lis 3,end@h
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ori 3,3,end@l
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lis 4,_start@h
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ori 4,4,_start@l
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sub 3,3,4
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blr
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/*
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* Execute
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* run(startsym, endsym, args, bootinfo, entry)
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*/
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.globl run
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run:
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mtctr 7 /* Entry point */
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bctr
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