[363] | 1 | /*
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| 2 | * TOPPERS/JSP Kernel
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| 3 | * Toyohashi Open Platform for Embedded Real-Time Systems/
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| 4 | * Just Standard Profile Kernel
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| 5 | *
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| 6 | * Copyright (C) 2000-2003 by Embedded and Real-Time Systems Laboratory
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| 7 | * Toyohashi Univ. of Technology, JAPAN
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| 8 | *
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| 9 | * ä¸è¨èä½æ¨©è
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| 10 | ã¯ï¼ä»¥ä¸ã® (1)ã(4) ã®æ¡ä»¶ãï¼Free Software Foundation
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| 11 | * ã«ãã£ã¦å
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| 12 | ¬è¡¨ããã¦ãã GNU General Public License ã® Version 2 ã«è¨
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| 13 | * è¿°ããã¦ããæ¡ä»¶ãæºããå ´åã«éãï¼æ¬ã½ããã¦ã§ã¢ï¼æ¬ã½ããã¦ã§ã¢
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| 14 | * ãæ¹å¤ãããã®ãå«ãï¼ä»¥ä¸åãï¼ã使ç¨ã»è¤è£½ã»æ¹å¤ã»åé
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| 15 | å¸ï¼ä»¥ä¸ï¼
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| 16 | * å©ç¨ã¨å¼ã¶ï¼ãããã¨ãç¡åã§è¨±è«¾ããï¼
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| 17 | * (1) æ¬ã½ããã¦ã§ã¢ãã½ã¼ã¹ã³ã¼ãã®å½¢ã§å©ç¨ããå ´åã«ã¯ï¼ä¸è¨ã®èä½
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| 18 | * 権表示ï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãï¼ãã®ã¾ã¾ã®å½¢ã§ã½ã¼
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| 19 | * ã¹ã³ã¼ãä¸ã«å«ã¾ãã¦ãããã¨ï¼
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| 20 | * (2) æ¬ã½ããã¦ã§ã¢ãï¼ã©ã¤ãã©ãªå½¢å¼ãªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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| 21 | * ç¨ã§ããå½¢ã§åé
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| 22 | å¸ããå ´åã«ã¯ï¼åé
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| 23 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨
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| 24 | * è
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| 25 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®èä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨
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| 26 | * ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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| 27 | * (3) æ¬ã½ããã¦ã§ã¢ãï¼æ©å¨ã«çµã¿è¾¼ããªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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| 28 | * ç¨ã§ããªãå½¢ã§åé
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| 29 | å¸ããå ´åã«ã¯ï¼æ¬¡ã®ããããã®æ¡ä»¶ãæºããã
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| 30 | * ã¨ï¼
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| 31 | * (a) åé
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| 32 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨è
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| 33 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®è
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| 34 | * ä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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| 35 | * (b) åé
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| 36 | å¸ã®å½¢æ
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| 37 | ãï¼å¥ã«å®ããæ¹æ³ã«ãã£ã¦ï¼TOPPERSããã¸ã§ã¯ãã«
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| 38 | * å ±åãããã¨ï¼
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| 39 | * (4) æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´æ¥çã¾ãã¯éæ¥çã«çãããããªãæ
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| 40 | * 害ãããï¼ä¸è¨èä½æ¨©è
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| 41 | ããã³TOPPERSããã¸ã§ã¯ããå
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| 42 | 責ãããã¨ï¼
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| 43 | *
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| 44 | * æ¬ã½ããã¦ã§ã¢ã¯ï¼ç¡ä¿è¨¼ã§æä¾ããã¦ãããã®ã§ããï¼ä¸è¨èä½æ¨©è
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| 45 | ã
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| 46 | * ãã³TOPPERSããã¸ã§ã¯ãã¯ï¼æ¬ã½ããã¦ã§ã¢ã«é¢ãã¦ï¼ãã®é©ç¨å¯è½æ§ã
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| 47 | * å«ãã¦ï¼ãããªãä¿è¨¼ãè¡ããªãï¼ã¾ãï¼æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´
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| 48 | * æ¥çã¾ãã¯éæ¥çã«çãããããªãæ害ã«é¢ãã¦ãï¼ãã®è²¬ä»»ãè² ããªãï¼
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| 49 | *
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| 50 | * @(#) $Id: start.S,v 1.9 2004/02/05 09:16:25 honda Exp $
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| 51 | */
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| 52 |
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| 53 | #define _MACRO_ONLY
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| 54 | #include <microblaze_asm.inc>
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| 55 | #include <t_config.h>
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| 56 | #include <sys_defs.h>
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| 57 | /*
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| 58 | * # 0x00 # Imm instr for reset address [Hi halfword]
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| 59 | * # 0x04 # Jump to _start [Lo halfword]
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| 60 | * # 0x08 # Imm instr for exception address [Hi halfword]
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| 61 | * # 0x0c # Jump to Exception handler [Lo halfword]
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| 62 | * # 0x10 # Imm instr for interrupt address [Hi halfword]
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| 63 | * # 0x14 # Jump to interrupt handler [Lo halfword]
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| 64 | */
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| 65 |
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| 66 |
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| 67 | .text
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| 68 | .global _start
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| 69 | .align 2
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| 70 | .ent _start
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| 71 | _start:
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| 72 | /*
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| 73 | * msrãåæå
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| 74 | */
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| 75 | la r1, r0, MSR_CACHE_SETTING
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| 76 | mts rmsr,r1
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| 77 |
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| 78 | /*
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| 79 | * opb_mdm ã使ã㨠msr ã®BIPãããã'1'ã§å®è¡ãããããï¼
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| 80 | * rtbdå½ä»¤ã«ãã'0'ã«åæåããï¼
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| 81 | * stub ã使ãå ´åã¯å¿
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| 82 | è¦ãªããç¹ã«å¯ä½ç¨ããªãããï¼ç¡æ¡ä»¶ã«å®è¡ããï¼
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| 83 | */
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| 84 | la r1, r0, _start_
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| 85 | rtbd r1,0
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| 86 | _start_:
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| 87 |
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| 88 | /*
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| 89 | * R2ã¨R3ã®è¨å®
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| 90 | *ã»R2 : Read-only small data area anchor
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| 91 | * _SDA2_BASE_ .sdata2ã®ä¸å¿
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| 92 | *ã»R13 : Read-write small data area anchor
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| 93 | * .sdataã¨sbssãé£ç¶ãã¦ç½®ãï¼ãã®ä¸éã«_SDA_BASE_ ãè¨å®ãã
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| 94 | */
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| 95 | la r13, r0, _SDA_BASE_
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| 96 | la r2, r0, _SDA2_BASE_
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| 97 |
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| 98 | /*
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| 99 | * ã¹ã¿ãã¯ãã¤ã³ã¿ã®åæå
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| 100 | */
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| 101 | la r1, r0, STACKTOP - 4
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| 102 |
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| 103 | /*
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| 104 | * ãã¯ã¿ãã¼ãã«ã®åæå
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| 105 | */
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| 106 | /*
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| 107 | * brai å½ä»¤ã®æ¸ãè¾¼ã¿
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| 108 | */
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| 109 | la r3, r0, 0xb8080000 /* brai ã®ãªãã³ã¼ã */
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| 110 | swi r3, r0, 0xc /* exceptionãã¯ã¿ã¸ç»é² */
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| 111 | swi r3, r0, 0x14 /* interrruptãã¯ã¿ã¸ç»é² */
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| 112 | /*
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| 113 | * imm å½ä»¤ã®æ¸ãè¾¼ã¿
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| 114 | */
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| 115 | la r4, r0, 0xb0000000 /* imm ã®ãªãã³ã¼ã */
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| 116 | swi r4, r0, 0x8 /* exceptionãã¯ã¿ã¸ç»é² */
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| 117 | swi r4, r0, 0x10 /* interrruptãã¯ã¿ã¸ç»é² */
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| 118 |
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| 119 | /*
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| 120 | * ä¾å¤ãã³ãã©ã®ç»é²
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| 121 | */
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| 122 | la r5, r0, exception_entry
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| 123 | sw r5, r1, r0
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| 124 | lhu r6, r1, r0
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| 125 | shi r5, r0, 0xe /* å²è¾¼ã¿ãã³ãã©ä¸ä½16bit */
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| 126 | shi r6, r0, 0xa /* å²è¾¼ã¿ãã³ãã©ä¸ä½16bit */
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| 127 |
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| 128 | /*
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| 129 | * å²è¾¼ã¿ãã³ãã©ã®ç»é²
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| 130 | */
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| 131 | la r5, r0, interrupt_entry
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| 132 | sw r5, r1, r0
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| 133 | lhu r6, r1, r0
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| 134 | shi r5, r0, 0x16 /* å²è¾¼ã¿ãã³ãã©ä¸ä½16bit */
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| 135 | shi r6, r0, 0x12 /* å²è¾¼ã¿ãã³ãã©ä¸ä½16bit */
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| 136 |
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| 137 |
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| 138 | /*
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| 139 | * _hardware_init_hook ãå¼ã³åºãã(0ã§ãªãå ´å)
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| 140 | *
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| 141 | * ãã¼ãã¦ã§ã¢ä¾åã«å¿
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| 142 | è¦ãªåæåå¦çãããå ´åã¯ï¼
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| 143 | * hardware_init_hook ã¨ããé¢æ°ãç¨æããã°ããï¼
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| 144 | * å
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| 145 | ·ä½çã«ã¯ROMåã®éãRAMã使ç¨å¯è½ã«ããããã®
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| 146 | * ãã¹ã³ã³ããã¼ã©ã®åæåçãè¡ãã
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| 147 | * sys_support.S å
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| 148 | 㧠_hardware_init_hook ãå®ç¾©ãã¦ã
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| 149 | * ãï¼
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| 150 | */
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| 151 | start_0:
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| 152 | la r3, r0, _hardware_init_hook
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| 153 | beqi r3, start_1
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| 154 | brald r15, r3
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| 155 | nop
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| 156 |
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| 157 |
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| 158 | /*
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| 159 | * bssã»ã¯ã·ã§ã³ãã¯ãªã¢
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| 160 | */
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| 161 | start_1:
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| 162 | la r3, r0, __bss_start
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| 163 | la r4, r0, _end
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| 164 | sub r5, r4, r3
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| 165 | beqi r5, start_3
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| 166 | start_2:
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| 167 | sb r0, r0, r3
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| 168 | addi r3, r3, 1
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| 169 | sub r5, r4, r3
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| 170 | bgti r5, start_2
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| 171 |
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| 172 | /*
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| 173 | * dataã»ã¯ã·ã§ã³ã®åæåï¼ROMå対å¿ï¼
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| 174 | *
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| 175 | * __idata_start ãã __idata_end ã¾ã§ãï¼__data_start 以éã«
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| 176 | * ã³ãã¼ããï¼
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| 177 | * Microblazeã¯å
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| 178 | èRAMãå°ãããã¨ã¨ï¼BRAMã®å
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| 179 | 容ã¯
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| 180 | * ãªã³ã³ãã£ã®ã¥ã¬ã¼ã·ã§ã³ããã¨åæåããããã
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| 181 | * dataã»ã¯ã·ã§ã³ã®åæåã¯è¡ããªã
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| 182 | * ãã ãå ´åã«ãã£ã¦ã¯å®è£
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| 183 | ãããã¨ãèãã¦ã©ãã«ã®ã¿å®ç¾©ãã¦ãã
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| 184 | */
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| 185 | start_3:
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| 186 | la r3, r0, __idata_start
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| 187 | la r4, r0, __idata_end
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| 188 | sub r5, r4, r3 /* ãµã¤ãºããã§ã㯠*/
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| 189 | beqi r5, start_5
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| 190 | la r6, r0, __data_start
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| 191 | start_4:
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| 192 | lbu r7, r0, r3
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| 193 | sb r7, r0, r6
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| 194 | addi r3, r3, 1
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| 195 | addi r6, r6, 1
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| 196 | sub r5, r4, r3
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| 197 | bgti r5, start_4
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| 198 |
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| 199 |
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| 200 | start_5:
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| 201 | la r3, r0, __isdata2_start
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| 202 | la r4, r0, __isdata2_end
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| 203 | sub r5, r4, r3 /* ãµã¤ãºããã§ã㯠*/
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| 204 | beqi r5, start_7
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| 205 | la r6, r0, __sdata2_start
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| 206 | start_6:
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| 207 | lbu r7, r0, r3
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| 208 | sb r7, r0, r6
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| 209 | addi r3, r3, 1
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| 210 | addi r6, r6, 1
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| 211 | sub r5, r4, r3
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| 212 | bgti r5, start_6
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| 213 |
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| 214 |
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| 215 | start_7:
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| 216 | la r3, r0, __isdata_start
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| 217 | la r4, r0, __isdata_end
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| 218 | sub r5, r4, r3 /* ãµã¤ãºããã§ã㯠*/
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| 219 | beqi r5, start_9
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| 220 | la r6, r0, __sdata_start
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| 221 | start_8:
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| 222 | lbu r7, r0, r3
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| 223 | sb r7, r0, r6
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| 224 | addi r3, r3, 1
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| 225 | addi r6, r6, 1
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| 226 | sub r5, r4, r3
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| 227 | bgti r5, start_8
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| 228 |
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| 229 |
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| 230 | /*
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| 231 | * _software_init_hook ãå¼ã³åºãï¼0 ã§ãªãå ´åï¼ï¼
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| 232 | *
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| 233 | * ã½ããã¦ã§ã¢ç°å¢ï¼ç¹ã«ã©ã¤ãã©ãªï¼ã«ä¾åãã¦å¿
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| 234 | è¦ãªåæåå¦
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| 235 | * çãããå ´åã¯ï¼software_init_hook ã¨ããé¢æ°ãç¨æããã°
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| 236 | * ããï¼
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| 237 | */
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| 238 | start_9:
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| 239 | la r3, r0, _software_init_hook
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| 240 | beqi r3, start_10
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| 241 | brald r15, r3
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| 242 | nop
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| 243 |
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| 244 | start_10:
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| 245 | brlid r15, kernel_start
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| 246 | addik r1,r1,4 /* ã¹ã¿ãã¯ãå
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| 247 | ã«æ»ã */
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