steve@bungia.mn.org (Steve Yelvington) (07/13/89)
References: <458@medusa.informatik.uni-erlangen.de>
Here is a complete desk accessory kit for the Sozobon C compiler.
Well, almost complete. You need GEM bindings, such as GEMFAST or
GEMQ, to make it work.
The first file (dastart.s) is a general desk accessory startup module.
The second (reboot.c) is a C program demonstrating how to write
a desk accessory. The example lets you point and click to reboot the system.
jas dastart.s
cc -Oc reboot.c
ld -o reboot.acc dastart.o reboot.o \lib\aes???.a \lib\dlibs.a
^
use the name of your | GEM AES bindings
This code is in the public domain.
-- Steve Yelvington
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*********************************************************
* dastart.s -- desk accessory startup code for Atari ST *
* public domain -- July 1989 by Steve Yelvington *
* written for Sozobon C and jas.ttp assembler *
*********************************************************
.bss
.even
stackbottom:
.ds.b 1024 * Set up a small stack
initstack:
.ds.l 1 * and a top for it
saveret:
.ds.l 1 * A place to store PC during OS traps
.text * Watch closely; this won't last long!
begin_acc: * We start
move.l #initstack,sp * by loading the stack pointer
jsr _main * jump to main() of the desk accessory
clr.w (sp) * Shouldn't get here! Put a zero on the stack
trap #1 * and terminate (Pterm0)
**********************************************************
* That's all there is to it. The rest of this file *
* provides gemdos, xbios and bios hooks on the assumption*
* that your DA might actually do something. :-) *
* Note: I'm not checking the stack here. See DSTART.S by *
* Dale Schumacher if you want to do that sort of thing *
**********************************************************
.globl _gemdos
_gemdos:
move.l (sp)+,saveret * save return address
trap #1 * hand off to the operating system
move.l saveret,-(sp) * restore the natural order of things
rts
.globl _bios
_bios:
move.l (sp)+,saveret
trap #13
move.l saveret,-(sp)
rts
.globl _xbios
_xbios:
move.l (sp)+,saveret
trap #14
move.l saveret,-(sp)
rts
.globl _crystal
* NOTICE: this is an AES binding needed with the GEMQ library...
* just comment it out if you use only GEMFAST.
_crystal:
move.l 4(sp),d1 * load aes parameter block ptr into d1
move.w #$C8,d0 * load magic number into d0
trap #2 * kick AES into action
rts
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/*
* reboot.c
* desk accessory to reboot the system
* Public domain 1989 by Steve Yelvington
* link dastart.o, then this module, then the GEM bindings, then dlibs.
* Note the inline assembler ... it probably will need massaging
* for compilers other than the Sozobon package. Be sure to
* #define (or -D) GEMFAST to avoid the AES arrays if you have that
* bindings library.
*/
#include <osbind.h>
#define MENU_ID " Reboot system "
#define AC_OPEN 40
#ifndef GEMFAST
/* these arrays aren't needed for GEMFAST, but GEMQ requires them */
int contrl[12], intin[128], intout[128], ptsin[128], ptsout[128];
#endif
main()
{
int apid, menuid, msgbuf[8];
apid = appl_init(); /* say hello to the AES */
menuid = menu_register(apid, MENU_ID); /* add me to the Desk menu */
while (1) /* loop forever */
{
evnt_mesag(msgbuf);
if ( (msgbuf[0] == AC_OPEN) && (msgbuf[4] == menuid) )
wakeup();
}
appl_exit(); /* you'll never get here -- supposedly */
}
wakeup()
/*
* This is where the desk accessory becomes active.
*/
{
int retval;
retval = form_alert(1,
"[3][?|Really reboot the system|?][No!|Warm boot|Cold boot]");
if (retval-1) /* button 1 is no */
reboot(retval-2); /* button 2 is warm boot */
}
reboot(cold)
int cold;
/*
* Force the Atari ST to reset itself. If cold is TRUE, the
* system will do a cold reboot, otherwise a warm boot.
* Based on assembler code by apratt@atari.UUCP (Allan Pratt).
* This function never returns, natch.
*/
{
Super(0L); /* go into supervisor mode */
if (cold)
asm("clr.l $420");
asm("move.l $4f2,a0"); /* a0 -> OS header */
asm("move.l 4(a0),a1"); /* a1 -> reset handler */
asm("jmp (a1)"); /* jump there. That's a reset. */
}
0/
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#define steve@thelake.UUCP pwcs!stag!thelake!steve
#define steve@thelake.citadel the_land!class68!thelake!steve