source: buchla-68k/orig/GEMDOS/REBOOT.S@ ee49131

Last change on this file since ee49131 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 8 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*
13reboot: 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*
22rb1: 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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