4.4BSD/usr/src/sys/pmax/stand/start.s
/*
* Copyright (c) 1992, 1993
* Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ralph Campbell.
*
* 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
* @(#)start.s 8.1 (Berkeley) 6/10/93
*/
/*
* start.s -
*
* Contains code that is the first executed at boot time.
*
* Copyright (C) 1989 Digital Equipment Corporation.
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies.
* Digital Equipment Corporation makes no representations about the
* suitability of this software for any purpose. It is provided "as is"
* without express or implied warranty.
*
* from: $Header: /sprite/src/boot/decprom/ds3100.md/RCS/start.s,
* v 1.1 90/02/16 16:19:39 shirriff Exp $ SPRITE (DECWRL)
*/
#include <machine/regdef.h>
#include <machine/machConst.h>
#include <machine/machAsmDefs.h>
#include <pmax/stand/dec_prom.h>
/*
* Amount to take off of the stack for the benefit of the debugger.
*/
#define START_FRAME ((4 * 4) + 4 + 4)
.globl start
start:
.set noreorder
la sp, start - START_FRAME
sw zero, START_FRAME - 4(sp) # Zero out old ra for debugger
sw zero, START_FRAME - 8(sp) # Zero out old fp for debugger
move s0, a0 # save argc
move s1, a1 # save argv
beq a3, 0x30464354, 1f # jump if boot from DS5000
move s3, a3 # save call vector
la s3, callvec # init call vector
1:
la a0, edata # clear BSS
la a1, end
jal bzero # bzero(edata, end - edata)
subu a1, a1, a0
sw s3, callv # save call vector
move a0, s0 # restore argc
jal main # main(argc, argv)
move a1, s1 # restore argv
li v0, DEC_PROM_RESTART # done, so call prom
j v0
nop
/* dummy routine for gcc2 */
.globl __main
__main:
j ra
nop
LEAF(prom_restart)
li v0, DEC_PROM_RESTART
j v0
nop
END(prom_restart)
LEAF(prom_open)
li v0, DEC_PROM_OPEN
j v0
nop
END(prom_open)
LEAF(prom_lseek)
li v0, DEC_PROM_LSEEK
j v0
nop
END(prom_lseek)
LEAF(prom_read)
li v0, DEC_PROM_READ
j v0
nop
END(prom_read)
LEAF(printf)
lw v0, callv # get pointer to call back vectors
sw a1, 4(sp) # store args on stack for printf
lw v0, 48(v0) # offset for callv->printf
sw a2, 8(sp)
j v0 # call PROM printf
sw a3, 12(sp)
END(printf)