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1 30 unneback
/*
2
 *
3
 *  This file contains the entry point for the application.
4
 *  It jumps to the BSP which is responsible for performing
5
 *  all initialization.
6
 *
7
 *  COPYRIGHT (c) 1989-1999.
8
 *  On-Line Applications Research Corporation (OAR).
9
 *
10
 *  The license and distribution terms for this file may in
11
 *  the file LICENSE in this distribution or at
12
 *  http://www.OARcorp.com/rtems/license.html.
13
 *
14
 * Based on the `gen68302' board support package, and covered by the
15
 * original distribution terms.
16
 *
17
 * W. Eric Norum
18
 * Saskatchewan Accelerator Laboratory
19
 * University of Saskatchewan
20
 * Saskatoon, Saskatchewan, CANADA
21
 * eric@skatter.usask.ca
22
 *
23
 *  $Id: start.S,v 1.2 2001-09-27 12:00:08 chris Exp $
24
 */
25
 
26
#include "asm.h"
27
 
28
BEGIN_CODE
29
        /*
30
         * Step 1: Decide on Reset Stack Pointer and Initial Program Counter
31
         */
32
Entry:
33
        .long   m360+1024               |   0: Initial SSP
34
        .long   start                   |   1: Initial PC
35
        .long   _uhoh                   |   2: Bus error
36
        .long   _uhoh                   |   3: Address error
37
        .long   _uhoh                   |   4: Illegal instruction
38
        .long   _uhoh                   |   5: Zero division
39
        .long   _uhoh                   |   6: CHK, CHK2 instruction
40
        .long   _uhoh                   |   7: TRAPcc, TRAPV instructions
41
        .long   _uhoh                   |   8: Privilege violation
42
        .long   _uhoh                   |   9: Trace
43
        .long   _uhoh                   |  10: Line 1010 emulator
44
        .long   _uhoh                   |  11: Line 1111 emulator
45
        .long   _uhoh                   |  12: Hardware breakpoint
46
        .long   _uhoh                   |  13: Reserved for coprocessor violation
47
        .long   _uhoh                   |  14: Format error
48
        .long   _uhoh                   |  15: Uninitialized interrupt
49
        .long   _uhoh                   |  16: Unassigned, reserved
50
        .long   _uhoh                   |  17:
51
        .long   _uhoh                   |  18:
52
        .long   _uhoh                   |  19:
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        .long   _uhoh                   |  20:
54
        .long   _uhoh                   |  21:
55
        .long   _uhoh                   |  22:
56
        .long   _uhoh                   |  23:
57
        .long   _spuriousInterrupt      |  24: Spurious interrupt
58
        .long   _uhoh                   |  25: Level 1 interrupt autovector
59
        .long   _uhoh                   |  26: Level 2 interrupt autovector
60
        .long   _uhoh                   |  27: Level 3 interrupt autovector
61
        .long   _uhoh                   |  28: Level 4 interrupt autovector
62
        .long   _uhoh                   |  29: Level 5 interrupt autovector
63
        .long   _uhoh                   |  30: Level 6 interrupt autovector
64
        .long   _uhoh                   |  31: Level 7 interrupt autovector
65
        .long   _uhoh                   |  32: Trap instruction (0-15)
66
        .long   _uhoh                   |  33:
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        .long   _uhoh                   |  34:
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        .long   _uhoh                   |  35:
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        .long   _uhoh                   |  36:
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        .long   _uhoh                   |  37:
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        .long   _uhoh                   |  38:
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        .long   _uhoh                   |  39:
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        .long   _uhoh                   |  40:
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        .long   _uhoh                   |  41:
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        .long   _uhoh                   |  42:
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        .long   _uhoh                   |  43:
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        .long   _uhoh                   |  44:
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        .long   _uhoh                   |  45:
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        .long   _uhoh                   |  46:
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        .long   _uhoh                   |  47:
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        .long   _uhoh                   |  48: Reserved for coprocessor
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        .long   _uhoh                   |  49:
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        .long   _uhoh                   |  50:
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        .long   _uhoh                   |  51:
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        .long   _uhoh                   |  52:
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        .long   _uhoh                   |  53:
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        .long   _uhoh                   |  54:
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        .long   _uhoh                   |  55:
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        .long   _uhoh                   |  56:
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        .long   _uhoh                   |  57:
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        .long   _uhoh                   |  58:
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        .long   _uhoh                   |  59: Unassigned, reserved
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        .long   _uhoh                   |  60:
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        .long   _uhoh                   |  61:
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        .long   _uhoh                   |  62:
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        .long   _uhoh                   |  63:
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        .long   _uhoh                   |  64: User defined vectors (192)
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        .long   _uhoh                   |  65:
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        .long   _uhoh                   |  66:
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        .long   _uhoh                   |  67:
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        .long   _uhoh                   |  68:
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        .long   _uhoh                   |  69:
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        .long   _uhoh                   |  70:
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        .long   _uhoh                   |  71:
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        .long   _uhoh                   |  72:
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        .long   _uhoh                   |  73:
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        .long   _uhoh                   |  74:
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        .long   _uhoh                   |  75:
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        .long   _uhoh                   |  76:
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        .long   _uhoh                   |  77:
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        .long   _uhoh                   |  78:
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        .long   _uhoh                   |  79:
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        .long   _uhoh                   |  80:
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        .long   _uhoh                   |  81:
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        .long   _uhoh                   |  82:
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        .long   _uhoh                   |  83:
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        .long   _uhoh                   |  84:
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        .long   _uhoh                   |  85:
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        .long   _uhoh                   |  86:
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        .long   _uhoh                   |  87:
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        .long   _uhoh                   |  88:
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        .long   _uhoh                   |  89:
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        .long   _uhoh                   |  90:
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        .long   _uhoh                   |  91:
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        .long   _uhoh                   |  92:
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        .long   _uhoh                   |  93:
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        .long   _uhoh                   |  94:
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        .long   _uhoh                   |  95:
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        .long   _uhoh                   |  96:
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        .long   _uhoh                   |  97:
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        .long   _uhoh                   |  98:
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        .long   _uhoh                   |  99:
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        .long   _uhoh                   | 100:
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        .long   _uhoh                   | 101:
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        .long   _uhoh                   | 102:
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        .long   _uhoh                   | 103:
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        .long   _uhoh                   | 104:
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        .long   _uhoh                   | 105:
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        .long   _uhoh                   | 106:
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        .long   _uhoh                   | 107:
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        .long   _uhoh                   | 108:
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        .long   _uhoh                   | 109:
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        .long   _uhoh                   | 110:
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        .long   _uhoh                   | 111:
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        .long   _uhoh                   | 112:
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        .long   _uhoh                   | 113:
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        .long   _uhoh                   | 114:
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        .long   _uhoh                   | 115:
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        .long   _uhoh                   | 116:
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        .long   _uhoh                   | 117:
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        .long   _uhoh                   | 118:
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        .long   _uhoh                   | 139:
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        .long   _uhoh                   | 140:
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        .long   _uhoh                   | 141:
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        .long   _uhoh                   | 142:
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        .long   _uhoh                   | 144:
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        .long   _uhoh                   | 146:
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        .long   _uhoh                   | 148:
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        .long   _uhoh                   | 150:
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        .long   _uhoh                   | 151:
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        .long   _uhoh                   | 155:
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        .long   _uhoh                   | 162:
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        .long   _uhoh                   | 176:
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        .long   _uhoh                   | 181:
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        .long   _uhoh                   | 182:
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        .long   _uhoh                   | 186:
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        .long   _uhoh                   | 187:
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        .long   _uhoh                   | 188:
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        .long   _uhoh                   | 192:
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        .long   _uhoh                   | 194:
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        .long   _uhoh                   | 195:
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        .long   _uhoh                   | 196:
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        .long   _uhoh                   | 197:
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        .long   _uhoh                   | 198:
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        .long   _uhoh                   | 199:
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        .long   _uhoh                   | 200:
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        .long   _uhoh                   | 201:
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        .long   _uhoh                   | 202:
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        .long   _uhoh                   | 203:
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        .long   _uhoh                   | 204:
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        .long   _uhoh                   | 211:
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        .long   _uhoh                   | 212:
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        .long   _uhoh                   | 215:
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        .long   _uhoh                   | 216:
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        .long   _uhoh                   | 217:
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        .long   _uhoh                   | 218:
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        .long   _uhoh                   | 219:
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        .long   _uhoh                   | 220:
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        .long   _uhoh                   | 221:
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        .long   _uhoh                   | 222:
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        .long   _uhoh                   | 225:
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        .long   _uhoh                   | 226:
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        .long   _uhoh                   | 227:
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        .long   _uhoh                   | 228:
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        .long   _uhoh                   | 229:
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        .long   _uhoh                   | 230:
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        .long   _uhoh                   | 231:
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        .long   _uhoh                   | 232:
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        .long   _uhoh                   | 233:
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        .long   _uhoh                   | 234:
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        .long   _uhoh                   | 235:
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        .long   _uhoh                   | 236:
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        .long   _uhoh                   | 237:
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        .long   _uhoh                   | 238:
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        .long   _uhoh                   | 239:
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        .long   _uhoh                   | 240:
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        .long   _uhoh                   | 241:
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        .long   _uhoh                   | 242:
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        .long   _uhoh                   | 243:
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        .long   _uhoh                   | 244:
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        .long   _uhoh                   | 245:
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        .long   _uhoh                   | 246:
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        .long   _uhoh                   | 247:
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        .long   _uhoh                   | 248:
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        .long   _uhoh                   | 249:
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        .long   _uhoh                   | 250:
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        .long   _uhoh                   | 251:
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        .long   _uhoh                   | 252:
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        .long   _uhoh                   | 253:
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        .long   _uhoh                   | 254:
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        .long   _uhoh                   | 255:
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290
/*
291
 * Default trap handler
292
 * With an oscilloscope you can see AS* stop
293
 */
294
        PUBLIC (_uhoh)
295
_uhoh:  nop                             | Leave spot for breakpoint
296
        stop    #0x2700                 | Stop with interrupts disabled
297
        bra.l   _uhoh                   | Stuck forever
298
 
299
/*
300
 * Log, but otherwise ignore, spurious interrupts
301
 */
302
        PUBLIC (_spuriousInterrupt)
303
_spuriousInterrupt:
304
        addql   #1,_M68kSpuriousInterruptCount
305
        rte
306
 
307
/*
308
 * Place the low-order 3 octets of the board's ethernet address at
309
 * a `well-known' fixed location relative to the startup location.
310
 */
311
        .align 2
312
        .word   0                        | Padding
313
ethernet_address_buffer:
314
        .word   0x08F3                  | Default address
315
        .word   0xDEAD
316
        .word   0xCAFE
317
 
318
/*
319
 * Initial PC
320
 */
321
.globl start
322
start:
323
        /*
324
         * Step 2: Stay in Supervisor Mode
325
         */
326
#if ( M68K_HAS_SEPARATE_STACKS == 1 )
327
        oriw    #0x3000,sr              | Switch to Master Stack Pointer
328
        lea     SYM(m360)+1024-64,a7    | Put stack in dual-port ram
329
                                        | a little below the interrupt stack
330
#endif
331
 
332
        /*
333
         * Step 3: Write the VBR
334
         */
335
        lea     Entry,a0                | Get base of vector table
336
        movec   a0,vbr                  | Set up the VBR
337
 
338
        /*
339
         * Step 4: Write the MBAR
340
         */
341
        movec   dfc,d1                  | Save destination register
342
        moveq   #7,d0                   | CPU-space funcction code
343
        movec   d0,dfc                  | Set destination function code register
344
        movel   #m360+0x101,d0          | MBAR value (mask CPU space accesses)
345
        movesl  d0,0x3FF00              | Set MBAR
346
        movec   d1,dfc                  | Restore destination register
347
 
348
        /*
349
         * Step 5: Verify a dual-port RAM location
350
         */
351
        lea     m360,a0                 | Point a0 to first DPRAM location
352
        moveb   #0x33,d0                | Set the test value
353
        moveb   d0,a0@                  | Set the memory location
354
        cmpb    a0@,d0                  | Does it read back?
355
        bne     _uhoh                   | If not, bad news!
356
        notb    d0                      | Flip bits
357
        moveb   d0,a0@                  | Set the memory location
358
        cmpb    a0@,d0                  | Does it read back?
359
        bne     _uhoh                   | If not, bad news!
360
 
361
        /*
362
         * Remaining steps are handled by C code
363
         */
364
        jmp     _Init68360              | Start C code (which never returns)
365
 
366
/*
367
 * Copy DATA segment, clear BSS segment, set up real stack, start C program.
368
 * Assume that DATA and BSS sizes are multiples of 4.
369
 */
370
        PUBLIC (_CopyDataClearBSSAndStart)
371
_CopyDataClearBSSAndStart:
372
        lea     _copy_start,a0          | Get start of DATA in RAM
373
        lea     etext,a2                | Get start of DATA in ROM
374
        cmpl    a0,a2                   | Are they the same?
375
        beq.s   NOCOPY                  | Yes, no copy necessary
376
        lea     _copy_end,a1            | Get end of DATA in RAM
377
        bra.s   COPYLOOPTEST            | Branch into copy loop
378
COPYLOOP:
379
        movel   a2@+,a0@+               | Copy word from ROM to RAM
380
COPYLOOPTEST:
381
        cmpl    a1,a0                   | Done?
382
        bcs.s   COPYLOOP                | No, skip
383
NOCOPY:
384
 
385
        lea     _clear_start,a0         | Get start of BSS
386
        lea     _clear_end,a1           | Get end of BSS
387
        clrl    d0                      | Value to set
388
        bra.s   ZEROLOOPTEST            | Branch into clear loop
389
ZEROLOOP:
390
        movel   d0,a0@+                 | Clear a word
391
ZEROLOOPTEST:
392
        cmpl    a1,a0                   | Done?
393
        bcs.s   ZEROLOOP                | No, skip
394
 
395
        movel   4(a7),_M68k_Ramsize     | Set RAM size
396
 
397
        movel   #_stack_init,a7         | set master stack pointer
398
        pea     env                     | envp
399
        pea     arg                     | argv
400
        movel   d0,a7@-                 | argc
401
        jsr     boot_card               | Call C main
402
 
403
        PUBLIC (_mainDone)
404
_mainDone:
405
        nop                             | Leave spot for breakpoint
406
        movew   #1,a7                   | Force a double bus error
407
        movel   d0,a7@-                 | This should cause a RESET
408
        stop    #0x2700                 | Stop with interrupts disabled
409
        bra.l   _mainDone               | Stuck forever
410
 
411
        .align 2
412
END_CODE
413
 
414
BEGIN_DATA_DCL
415
        .align 2
416
        PUBLIC (environ)
417
environ:
418
        .long   env
419
        PUBLIC (_M68kSpuriousInterruptCount)
420
_M68kSpuriousInterruptCount:
421
        .long   0
422
END_DATA_DCL
423
 
424
BEGIN_BSS
425
env:    .long   0
426
arg:    .long   0
427
END_BSS
428
 
429
END

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