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30 |
unneback |
/*
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*
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* This file contains the entry point for the application.
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* It jumps to the BSP which is responsible for performing
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* all initialization.
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*
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* COPYRIGHT (c) 1989-1999.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may in
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* the file LICENSE in this distribution or at
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* http://www.OARcorp.com/rtems/license.html.
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*
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* Based on the `gen68302' board support package, and covered by the
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* original distribution terms.
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*
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* W. Eric Norum
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* Saskatchewan Accelerator Laboratory
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* University of Saskatchewan
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* Saskatoon, Saskatchewan, CANADA
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* eric@skatter.usask.ca
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*
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* $Id: start.S,v 1.2 2001-09-27 12:00:08 chris Exp $
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*/
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#include "asm.h"
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BEGIN_CODE
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/*
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* Step 1: Decide on Reset Stack Pointer and Initial Program Counter
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*/
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Entry:
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.long m360+1024 | 0: Initial SSP
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.long start | 1: Initial PC
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| 35 |
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.long _uhoh | 2: Bus error
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.long _uhoh | 3: Address error
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.long _uhoh | 4: Illegal instruction
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.long _uhoh | 5: Zero division
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.long _uhoh | 6: CHK, CHK2 instruction
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.long _uhoh | 7: TRAPcc, TRAPV instructions
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.long _uhoh | 8: Privilege violation
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.long _uhoh | 9: Trace
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.long _uhoh | 10: Line 1010 emulator
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.long _uhoh | 11: Line 1111 emulator
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| 45 |
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.long _uhoh | 12: Hardware breakpoint
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| 46 |
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.long _uhoh | 13: Reserved for coprocessor violation
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| 47 |
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.long _uhoh | 14: Format error
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| 48 |
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.long _uhoh | 15: Uninitialized interrupt
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| 49 |
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.long _uhoh | 16: Unassigned, reserved
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.long _uhoh | 17:
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| 51 |
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.long _uhoh | 18:
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| 52 |
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.long _uhoh | 19:
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| 53 |
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.long _uhoh | 20:
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| 54 |
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.long _uhoh | 21:
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| 55 |
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.long _uhoh | 22:
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| 56 |
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.long _uhoh | 23:
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| 57 |
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.long _spuriousInterrupt | 24: Spurious interrupt
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.long _uhoh | 25: Level 1 interrupt autovector
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.long _uhoh | 26: Level 2 interrupt autovector
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.long _uhoh | 27: Level 3 interrupt autovector
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| 61 |
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.long _uhoh | 28: Level 4 interrupt autovector
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| 62 |
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.long _uhoh | 29: Level 5 interrupt autovector
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.long _uhoh | 30: Level 6 interrupt autovector
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.long _uhoh | 31: Level 7 interrupt autovector
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.long _uhoh | 32: Trap instruction (0-15)
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.long _uhoh | 33:
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| 67 |
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.long _uhoh | 34:
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| 68 |
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.long _uhoh | 35:
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| 69 |
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.long _uhoh | 36:
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| 70 |
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.long _uhoh | 37:
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| 71 |
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.long _uhoh | 38:
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| 72 |
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.long _uhoh | 39:
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| 73 |
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.long _uhoh | 40:
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| 74 |
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.long _uhoh | 41:
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| 75 |
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.long _uhoh | 42:
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| 76 |
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.long _uhoh | 43:
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| 77 |
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.long _uhoh | 44:
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| 78 |
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.long _uhoh | 45:
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| 79 |
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.long _uhoh | 46:
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| 80 |
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.long _uhoh | 47:
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| 81 |
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.long _uhoh | 48: Reserved for coprocessor
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.long _uhoh | 49:
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| 83 |
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.long _uhoh | 50:
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| 84 |
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.long _uhoh | 51:
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| 85 |
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.long _uhoh | 52:
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| 86 |
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.long _uhoh | 53:
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| 87 |
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.long _uhoh | 54:
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| 88 |
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.long _uhoh | 55:
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| 89 |
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.long _uhoh | 56:
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| 90 |
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.long _uhoh | 57:
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| 91 |
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.long _uhoh | 58:
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| 92 |
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.long _uhoh | 59: Unassigned, reserved
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| 93 |
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.long _uhoh | 60:
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| 94 |
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.long _uhoh | 61:
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| 95 |
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.long _uhoh | 62:
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| 96 |
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.long _uhoh | 63:
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| 97 |
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.long _uhoh | 64: User defined vectors (192)
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| 98 |
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.long _uhoh | 65:
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| 99 |
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.long _uhoh | 66:
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| 100 |
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.long _uhoh | 67:
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| 101 |
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.long _uhoh | 68:
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| 102 |
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.long _uhoh | 69:
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| 103 |
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.long _uhoh | 70:
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| 104 |
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.long _uhoh | 71:
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| 105 |
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.long _uhoh | 72:
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| 106 |
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.long _uhoh | 73:
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| 107 |
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.long _uhoh | 74:
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| 108 |
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.long _uhoh | 75:
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| 109 |
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.long _uhoh | 76:
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| 110 |
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.long _uhoh | 77:
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| 111 |
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.long _uhoh | 78:
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| 112 |
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.long _uhoh | 79:
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| 113 |
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.long _uhoh | 80:
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| 114 |
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.long _uhoh | 81:
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| 115 |
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.long _uhoh | 82:
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| 116 |
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.long _uhoh | 83:
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| 117 |
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.long _uhoh | 84:
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| 118 |
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.long _uhoh | 85:
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| 119 |
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.long _uhoh | 86:
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| 120 |
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.long _uhoh | 87:
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| 121 |
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.long _uhoh | 88:
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| 122 |
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.long _uhoh | 89:
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| 123 |
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.long _uhoh | 90:
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| 124 |
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.long _uhoh | 91:
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| 125 |
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.long _uhoh | 92:
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| 126 |
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.long _uhoh | 93:
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| 127 |
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.long _uhoh | 94:
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| 128 |
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.long _uhoh | 95:
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| 129 |
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.long _uhoh | 96:
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| 130 |
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.long _uhoh | 97:
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| 131 |
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.long _uhoh | 98:
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| 132 |
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.long _uhoh | 99:
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| 133 |
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.long _uhoh | 100:
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| 134 |
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.long _uhoh | 101:
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| 135 |
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.long _uhoh | 102:
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| 136 |
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.long _uhoh | 103:
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| 137 |
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.long _uhoh | 104:
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| 138 |
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.long _uhoh | 105:
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| 139 |
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.long _uhoh | 106:
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| 140 |
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.long _uhoh | 107:
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| 141 |
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.long _uhoh | 108:
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| 142 |
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.long _uhoh | 109:
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| 143 |
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.long _uhoh | 110:
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| 144 |
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.long _uhoh | 111:
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| 145 |
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.long _uhoh | 112:
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| 146 |
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.long _uhoh | 113:
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| 147 |
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.long _uhoh | 114:
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| 148 |
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.long _uhoh | 115:
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| 149 |
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.long _uhoh | 116:
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| 150 |
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.long _uhoh | 117:
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| 151 |
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.long _uhoh | 118:
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| 152 |
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.long _uhoh | 119:
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| 153 |
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.long _uhoh | 120:
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| 154 |
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.long _uhoh | 121:
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| 155 |
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.long _uhoh | 122:
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| 156 |
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.long _uhoh | 123:
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| 157 |
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.long _uhoh | 124:
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| 158 |
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.long _uhoh | 125:
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| 159 |
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.long _uhoh | 126:
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| 160 |
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.long _uhoh | 127:
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| 161 |
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.long _uhoh | 128:
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| 162 |
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.long _uhoh | 129:
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| 163 |
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.long _uhoh | 130:
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| 164 |
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.long _uhoh | 131:
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| 165 |
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.long _uhoh | 132:
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| 166 |
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.long _uhoh | 133:
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| 167 |
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.long _uhoh | 134:
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| 168 |
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.long _uhoh | 135:
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| 169 |
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.long _uhoh | 136:
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| 170 |
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.long _uhoh | 137:
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| 171 |
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.long _uhoh | 138:
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| 172 |
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.long _uhoh | 139:
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| 173 |
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.long _uhoh | 140:
|
| 174 |
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.long _uhoh | 141:
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| 175 |
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.long _uhoh | 142:
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| 176 |
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.long _uhoh | 143:
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| 177 |
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.long _uhoh | 144:
|
| 178 |
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.long _uhoh | 145:
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| 179 |
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.long _uhoh | 146:
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| 180 |
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.long _uhoh | 147:
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| 181 |
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.long _uhoh | 148:
|
| 182 |
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.long _uhoh | 149:
|
| 183 |
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.long _uhoh | 150:
|
| 184 |
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.long _uhoh | 151:
|
| 185 |
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.long _uhoh | 152:
|
| 186 |
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.long _uhoh | 153:
|
| 187 |
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.long _uhoh | 154:
|
| 188 |
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.long _uhoh | 155:
|
| 189 |
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.long _uhoh | 156:
|
| 190 |
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.long _uhoh | 157:
|
| 191 |
|
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.long _uhoh | 158:
|
| 192 |
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.long _uhoh | 159:
|
| 193 |
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.long _uhoh | 160:
|
| 194 |
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.long _uhoh | 161:
|
| 195 |
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.long _uhoh | 162:
|
| 196 |
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.long _uhoh | 163:
|
| 197 |
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.long _uhoh | 164:
|
| 198 |
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.long _uhoh | 165:
|
| 199 |
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.long _uhoh | 166:
|
| 200 |
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.long _uhoh | 167:
|
| 201 |
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.long _uhoh | 168:
|
| 202 |
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.long _uhoh | 169:
|
| 203 |
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.long _uhoh | 170:
|
| 204 |
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.long _uhoh | 171:
|
| 205 |
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.long _uhoh | 172:
|
| 206 |
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.long _uhoh | 173:
|
| 207 |
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.long _uhoh | 174:
|
| 208 |
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.long _uhoh | 175:
|
| 209 |
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.long _uhoh | 176:
|
| 210 |
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.long _uhoh | 177:
|
| 211 |
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.long _uhoh | 178:
|
| 212 |
|
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.long _uhoh | 179:
|
| 213 |
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.long _uhoh | 180:
|
| 214 |
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.long _uhoh | 181:
|
| 215 |
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.long _uhoh | 182:
|
| 216 |
|
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.long _uhoh | 183:
|
| 217 |
|
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.long _uhoh | 184:
|
| 218 |
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.long _uhoh | 185:
|
| 219 |
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.long _uhoh | 186:
|
| 220 |
|
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.long _uhoh | 187:
|
| 221 |
|
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.long _uhoh | 188:
|
| 222 |
|
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.long _uhoh | 189:
|
| 223 |
|
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.long _uhoh | 190:
|
| 224 |
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.long _uhoh | 191:
|
| 225 |
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.long _uhoh | 192:
|
| 226 |
|
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.long _uhoh | 193:
|
| 227 |
|
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.long _uhoh | 194:
|
| 228 |
|
|
.long _uhoh | 195:
|
| 229 |
|
|
.long _uhoh | 196:
|
| 230 |
|
|
.long _uhoh | 197:
|
| 231 |
|
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.long _uhoh | 198:
|
| 232 |
|
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.long _uhoh | 199:
|
| 233 |
|
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.long _uhoh | 200:
|
| 234 |
|
|
.long _uhoh | 201:
|
| 235 |
|
|
.long _uhoh | 202:
|
| 236 |
|
|
.long _uhoh | 203:
|
| 237 |
|
|
.long _uhoh | 204:
|
| 238 |
|
|
.long _uhoh | 205:
|
| 239 |
|
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.long _uhoh | 206:
|
| 240 |
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|
.long _uhoh | 207:
|
| 241 |
|
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.long _uhoh | 208:
|
| 242 |
|
|
.long _uhoh | 209:
|
| 243 |
|
|
.long _uhoh | 210:
|
| 244 |
|
|
.long _uhoh | 211:
|
| 245 |
|
|
.long _uhoh | 212:
|
| 246 |
|
|
.long _uhoh | 213:
|
| 247 |
|
|
.long _uhoh | 214:
|
| 248 |
|
|
.long _uhoh | 215:
|
| 249 |
|
|
.long _uhoh | 216:
|
| 250 |
|
|
.long _uhoh | 217:
|
| 251 |
|
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.long _uhoh | 218:
|
| 252 |
|
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.long _uhoh | 219:
|
| 253 |
|
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.long _uhoh | 220:
|
| 254 |
|
|
.long _uhoh | 221:
|
| 255 |
|
|
.long _uhoh | 222:
|
| 256 |
|
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.long _uhoh | 223:
|
| 257 |
|
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.long _uhoh | 224:
|
| 258 |
|
|
.long _uhoh | 225:
|
| 259 |
|
|
.long _uhoh | 226:
|
| 260 |
|
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.long _uhoh | 227:
|
| 261 |
|
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.long _uhoh | 228:
|
| 262 |
|
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.long _uhoh | 229:
|
| 263 |
|
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.long _uhoh | 230:
|
| 264 |
|
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.long _uhoh | 231:
|
| 265 |
|
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.long _uhoh | 232:
|
| 266 |
|
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.long _uhoh | 233:
|
| 267 |
|
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.long _uhoh | 234:
|
| 268 |
|
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.long _uhoh | 235:
|
| 269 |
|
|
.long _uhoh | 236:
|
| 270 |
|
|
.long _uhoh | 237:
|
| 271 |
|
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.long _uhoh | 238:
|
| 272 |
|
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.long _uhoh | 239:
|
| 273 |
|
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.long _uhoh | 240:
|
| 274 |
|
|
.long _uhoh | 241:
|
| 275 |
|
|
.long _uhoh | 242:
|
| 276 |
|
|
.long _uhoh | 243:
|
| 277 |
|
|
.long _uhoh | 244:
|
| 278 |
|
|
.long _uhoh | 245:
|
| 279 |
|
|
.long _uhoh | 246:
|
| 280 |
|
|
.long _uhoh | 247:
|
| 281 |
|
|
.long _uhoh | 248:
|
| 282 |
|
|
.long _uhoh | 249:
|
| 283 |
|
|
.long _uhoh | 250:
|
| 284 |
|
|
.long _uhoh | 251:
|
| 285 |
|
|
.long _uhoh | 252:
|
| 286 |
|
|
.long _uhoh | 253:
|
| 287 |
|
|
.long _uhoh | 254:
|
| 288 |
|
|
.long _uhoh | 255:
|
| 289 |
|
|
|
| 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
|
