1993-10-12 08:17:41 +03:00
|
|
|
/*
|
|
|
|
|
* Copyright (c) 1993 Adam Glass
|
|
|
|
|
* 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 Adam Glass.
|
|
|
|
|
* 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 Adam Glass ``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.
|
|
|
|
|
*
|
1994-02-04 11:19:37 +03:00
|
|
|
* $Header: /cvsroot/src/sys/arch/sun3/netboot/Attic/start.s,v 1.2 1994/02/04 08:20:15 glass Exp $
|
1993-10-12 08:17:41 +03:00
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#include "assym.s"
|
|
|
|
|
#include "../include/asm.h"
|
|
|
|
|
|
|
|
|
|
.text
|
|
|
|
|
.globl start
|
|
|
|
|
start:
|
|
|
|
|
movl #FIXED_LOAD_ADDR,a0 | where we are (a0)
|
|
|
|
|
lea start:l, a1 | where we want to be (a1)
|
|
|
|
|
cmpl a0, a1
|
|
|
|
|
jeq begin
|
|
|
|
|
movl #_edata, d0
|
|
|
|
|
copy:
|
|
|
|
|
movl a0@+,a1@+
|
|
|
|
|
cmpl d0, a1
|
|
|
|
|
jne copy
|
|
|
|
|
jmp begin:l
|
|
|
|
|
/* find out where we are, and copy ourselves to where we are supposed to be */
|
|
|
|
|
.align 4
|
|
|
|
|
begin:
|
|
|
|
|
moveq #FC_CONTROL, d0 | make movs get us to the control
|
|
|
|
|
movc d0, dfc | space where the sun3 designers
|
|
|
|
|
movc d0, sfc | put all the "useful" stuff
|
|
|
|
|
moveq #CONTEXT_0, d0
|
|
|
|
|
movsb d0, CONTEXT_REG | now in context 0
|
|
|
|
|
|
|
|
|
|
savesp: movl sp, start-4:l
|
|
|
|
|
lea start-4:l, sp
|
|
|
|
|
movl #(FIXED_LOAD_ADDR-4), sp
|
|
|
|
|
jsr _machdep_nfsboot
|
|
|
|
|
jsr FIXED_LOAD_ADDR
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* unsigned int get_control_word (char *)
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
ENTRY(get_control_word)
|
|
|
|
|
movl sp@(4), a0
|
|
|
|
|
movsl a0@, d0
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* void set_control_word (char *, unsigned int)
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
ENTRY(set_control_word)
|
|
|
|
|
movl sp@(4), a0
|
|
|
|
|
movl sp@(8), d0
|
|
|
|
|
movsl d0, a0@
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* unsigned char get_control_byte (char *)
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
ENTRY(get_control_byte)
|
|
|
|
|
movl sp@(4), a0
|
|
|
|
|
moveq #0, d0
|
|
|
|
|
movsb a0@, d0
|
|
|
|
|
rts
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Get callers current SP value.
|
|
|
|
|
* Note that simply taking the address of a local variable in a C function
|
|
|
|
|
* doesn't work because callee saved registers may be outside the stack frame
|
|
|
|
|
* defined by A6 (e.g. GCC generated code).
|
|
|
|
|
*
|
|
|
|
|
* [I don't think the ENTRY() macro will do the right thing with this -- glass]
|
|
|
|
|
*/
|
|
|
|
|
.globl _getsp; .align 2
|
|
|
|
|
_getsp:
|
|
|
|
|
movl sp,d0 | get current SP
|
|
|
|
|
addql #4,d0 | compensate for return address
|
|
|
|
|
rts
|
