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REBOOT.S@ 6888aa2

Last change on this file since 6888aa2 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 7 years ago
Imported original source code.
Property mode set to `100755`
File size: 923 bytes

Line
1	* ------------------------------------------------------------------------------
2	* reboot.s -- re-boot the system
3	* Version 3 -- 1988-10-03 -- D.N. Lynx Crowe
4	*
5	* Since the Atari likes to do warm starts when a reset is attempted, we
6	* have to zap low RAM to get rid of optional installed device drivers
7	* we don't want any more. We also do a 'reset' just to be sure.
8	* ------------------------------------------------------------------------------
9	.text
10	*
11	.xdef reboot
12	*
13	reboot: clr.l -(sp) * get into supervisor state
14	move.w #$20,-(sp) * ...
15	trap #1 * ...
16	*
17	move.w #$2700,sr * disable interrupts
18	*
19	move.w #1022,d0 * set the zap loop count
20	movea.l #8,a0 * set the starting address
21	*
22	rb1: clr.l (a0)+ * zap a long word
23	dbra d0,rb1 * loop until all are cleared
24	*
25	reset * reset the hardware
26	*
27	movea.l 4,a0 * get boot pc
28	jmp (a0) * go to the boot PROM
29	*
30	.end

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