[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 | * Copyright (C) 2000-2003 by Industrial Technology Institute,
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| 9 | * Miyagi Prefectural Government, JAPAN
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| 10 | *
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| 11 | * ä¸è¨èä½æ¨©è
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| 12 | ã¯ï¼ä»¥ä¸ã® (1)ã(4) ã®æ¡ä»¶ãï¼Free Software Foundation
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| 13 | * ã«ãã£ã¦å
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| 14 | ¬è¡¨ããã¦ãã GNU General Public License ã® Version 2 ã«è¨
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| 15 | * è¿°ããã¦ããæ¡ä»¶ãæºããå ´åã«éãï¼æ¬ã½ããã¦ã§ã¢ï¼æ¬ã½ããã¦ã§ã¢
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| 16 | * ãæ¹å¤ãããã®ãå«ãï¼ä»¥ä¸åãï¼ã使ç¨ã»è¤è£½ã»æ¹å¤ã»åé
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| 17 | å¸ï¼ä»¥ä¸ï¼
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| 18 | * å©ç¨ã¨å¼ã¶ï¼ãããã¨ãç¡åã§è¨±è«¾ããï¼
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| 19 | * (1) æ¬ã½ããã¦ã§ã¢ãã½ã¼ã¹ã³ã¼ãã®å½¢ã§å©ç¨ããå ´åã«ã¯ï¼ä¸è¨ã®èä½
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| 20 | * 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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| 21 | * ã¹ã³ã¼ãä¸ã«å«ã¾ãã¦ãããã¨ï¼
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| 22 | * (2) æ¬ã½ããã¦ã§ã¢ãï¼ã©ã¤ãã©ãªå½¢å¼ãªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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| 23 | * ç¨ã§ããå½¢ã§åé
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| 24 | å¸ããå ´åã«ã¯ï¼åé
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| 25 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨
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| 26 | * è
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| 27 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®èä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨
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| 28 | * ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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| 29 | * (3) æ¬ã½ããã¦ã§ã¢ãï¼æ©å¨ã«çµã¿è¾¼ããªã©ï¼ä»ã®ã½ããã¦ã§ã¢éçºã«ä½¿
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| 30 | * ç¨ã§ããªãå½¢ã§åé
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| 31 | å¸ããå ´åã«ã¯ï¼æ¬¡ã®ããããã®æ¡ä»¶ãæºããã
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| 32 | * ã¨ï¼
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| 33 | * (a) åé
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| 34 | å¸ã«ä¼´ãããã¥ã¡ã³ãï¼å©ç¨è
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| 35 | ããã¥ã¢ã«ãªã©ï¼ã«ï¼ä¸è¨ã®è
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| 36 | * ä½æ¨©è¡¨ç¤ºï¼ãã®å©ç¨æ¡ä»¶ããã³ä¸è¨ã®ç¡ä¿è¨¼è¦å®ãæ²è¼ãããã¨ï¼
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| 37 | * (b) åé
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| 38 | å¸ã®å½¢æ
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| 39 | ãï¼å¥ã«å®ããæ¹æ³ã«ãã£ã¦ï¼TOPPERSããã¸ã§ã¯ãã«
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| 40 | * å ±åãããã¨ï¼
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| 41 | * (4) æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´æ¥çã¾ãã¯éæ¥çã«çãããããªãæ
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| 42 | * 害ãããï¼ä¸è¨èä½æ¨©è
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| 43 | ããã³TOPPERSããã¸ã§ã¯ããå
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| 44 | 責ãããã¨ï¼
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| 45 | *
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| 46 | * æ¬ã½ããã¦ã§ã¢ã¯ï¼ç¡ä¿è¨¼ã§æä¾ããã¦ãããã®ã§ããï¼ä¸è¨èä½æ¨©è
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| 47 | ã
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| 48 | * ãã³TOPPERSããã¸ã§ã¯ãã¯ï¼æ¬ã½ããã¦ã§ã¢ã«é¢ãã¦ï¼ãã®é©ç¨å¯è½æ§ã
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| 49 | * å«ãã¦ï¼ãããªãä¿è¨¼ãè¡ããªãï¼ã¾ãï¼æ¬ã½ããã¦ã§ã¢ã®å©ç¨ã«ããç´
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| 50 | * æ¥çã¾ãã¯éæ¥çã«çãããããªãæ害ã«é¢ãã¦ãï¼ãã®è²¬ä»»ãè² ããªãï¼
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| 51 | */
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| 52 |
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| 53 | #define _MACRO_ONLY
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| 54 |
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| 55 | #include "jsp_kernel.h" /* INIT_SR */
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| 56 |
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| 57 | /*
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| 58 | * MIPS3ç¨ã¹ã¿ã¼ãã¢ããã¢ã¸ã¥ã¼ã«
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| 59 | * ãªã»ãããã¯ã¿ 0xbfc00000çªå°ã«é
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| 60 | ç½®
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| 61 | *
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| 62 | * ã«ã¼ãã«ã¯ã¢ããªã±ã¼ã·ã§ã³ã¨ãªã³ã¯ãã¦ä½¿ç¨ããã ããªã®ã§
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| 63 | * JSPã«ã¼ãã«ã®ã¿ä½¿ç¨ããã
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| 64 | */
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| 65 |
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| 66 | .section ".reset","xa"
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| 67 |
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| 68 | .set noreorder
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| 69 |
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| 70 | .align 2
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| 71 | .global reset
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| 72 |
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| 73 | reset:
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| 74 | /*
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| 75 | * CPUã¬ã¸ã¹ã¿ã®åæå
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| 76 | */
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| 77 |
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| 78 | /* HI, LO (ä¹é¤ç®ã¬ã¸ã¹ã¿) */
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| 79 | mthi zero
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| 80 | mtlo zero
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| 81 |
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| 82 | /* sp (ã¹ã¿ãã¯ãã¤ã³ã¿ï¼éã¿ã¹ã¯ã³ã³ããã¹ãç¨)
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| 83 | _stack_top ã¯ãã·ã¹ãã ä¾åé¨(ãªã³ã«ã¹ã¯ãªããæ¨å¥¨)å®ç¾© */
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| 84 | la sp, _stack_top
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| 85 |
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| 86 | /* gp (ã°ãã¼ãã«ãã¤ã³ã¿)
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| 87 | _gp ã¯ãã·ã¹ãã ä¾åé¨(ãªã³ã«ã¹ã¯ãªããæ¨å¥¨)å®ç¾© */
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| 88 | la gp, _gp
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| 89 |
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| 90 | /* k0 (å²è¾¼ã¿/CPUä¾å¤ãã¹ãã«ã¦ã³ã¿ç¨) */
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| 91 | li k0, 0x1 /* ã¿ã¹ã¯èµ·åã¾ã§ã¯ãéã¿ã¹ã¯ã³ã³ããã¹ãã§ã®
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| 92 | å®è¡ã¨ã¿ãªãã */
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| 93 | /* k1ã¯ãæ¢ã«æ±ç¨ã¨ãã¦å©ç¨ãã¦ããã®ã§åæåããªãã */
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| 94 |
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| 95 | /*
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| 96 | * CP0ã¬ã¸ã¹ã¿ã®åæå
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| 97 | */
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| 98 |
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| 99 | /* SR (ã¹ãã¼ã¿ã¹ã¬ã¸ã¹ã¿)
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| 100 | (ããã§ã³ã¢ã®å²è¾¼ã¿ãã¹ã¯ãè¨å®ãããããã¯ãå®è³ªçãªå²è¾¼ã¿å¶å¾¡ã¯ã
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| 101 | å¤é¨å²è¾¼ã¿ã³ã³ããã¼ã©ã§è¡ãããã)
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| 102 | INIT_SR ã¯ãsys_config.h ã§å®ç¾© */
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| 103 | li t0, INIT_SR
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| 104 | mtc0 t0, Status
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| 105 |
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| 106 | /* Config (ã³ã³ãã£ã°ã¬ã¸ã¹ã¿)
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| 107 | INIT_CONFIG_MASK ã¯ãsys_config.h ã§å®ç¾© */
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| 108 | mfc0 t0, Config
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| 109 | li t1, INIT_CONFIG_MASK
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| 110 | or t0, t0, t1
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| 111 | mtc0 t0, Config
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| 112 |
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| 113 | /* WatchLo (ã¦ã©ããLoã¬ã¸ã¹ã¿) */
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| 114 | mtc0 zero, WatchLo
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| 115 |
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| 116 | /* Compare (æ¯è¼ã¬ã¸ã¹ã¿) */
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| 117 | li t0, 0xffffffff
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| 118 | mtc0 t0, Compare
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| 119 |
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| 120 | /*
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| 121 | * hardware_init_hook ãå¼ã³åºãã(0ã§ãªãå ´å)
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| 122 | *
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| 123 | * ã»ã¿ã¼ã²ãããã¼ãã¦ã§ã¢ã«ä¾åããåæåå¦çãããå ´åã¯ï¼
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| 124 | * hardware_init_hook ã¨ããé¢æ°ãç¨æããï¼
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| 125 | * ä¾ï¼ROMåã®éãRAMã使ç¨å¯è½ã«ããããã®ãã¹ã³ã³ããã¼ã©ã®åæå
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| 126 | * ä»åã¯ãsys_support.S å
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| 127 | 㧠hardware_init_hook ãå®ç¾©ãã¦ããï¼
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| 128 | */
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| 129 | hardware_init:
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| 130 | la t0, hardware_init_hook
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| 131 | beq t0, zero, bss_clear
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| 132 | nop
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| 133 | jalr ra, t0
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| 134 | nop
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| 135 |
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| 136 | /*
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| 137 | * bssã»ã¯ã·ã§ã³ãã¯ãªã¢
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| 138 | */
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| 139 | bss_clear:
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| 140 | la t1, __bss_start
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| 141 | la t2, __bss_end
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| 142 | beq t1, t2, data_sec_copy
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| 143 | nop
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| 144 | sw zero, (t1)
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| 145 | loop_bss_clear:
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| 146 | addi t1, t1, 4
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| 147 | sub t3, t2, t1
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| 148 | bgez t3, loop_bss_clear
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| 149 | sw zero, (t1)
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| 150 |
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| 151 | /*
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| 152 | * dataã»ã¯ã·ã§ã³ãåæåãã (ROMå対å¿)
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| 153 | *
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| 154 | * __idata_start ãã __idata_end ã¾ã§ãï¼__data_start 以éã«ã³ãã¼ãã
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| 155 | */
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| 156 | data_sec_copy:
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| 157 | la t1, __idata_start
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| 158 | la t2, __idata_end
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| 159 | beq t1, t2, software_init
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| 160 | nop
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| 161 | la t3, __data_start
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| 162 | loop_data_sec_copy:
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| 163 | lw t5, (t1)
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| 164 | sw t5, (t3)
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| 165 | addi t1, t1, 4
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| 166 | addi t3, t3, 4
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| 167 | sub t4, t2, t1
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| 168 | bgtz t4, loop_data_sec_copy
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| 169 | nop
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| 170 |
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| 171 | /*
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| 172 | * software_init_hook ãå¼ã³åºãï¼0 ã§ãªãå ´åï¼
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| 173 | *
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| 174 | * ã½ããã¦ã§ã¢ç°å¢ï¼ç¹ã«ã©ã¤ãã©ãªï¼ã«ä¾åãã¦å¿
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| 175 | è¦ãªåæåå¦çããã
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| 176 | * å ´åã¯ï¼software_init_hook ã¨ããé¢æ°ãç¨æããï¼
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| 177 | */
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| 178 | software_init:
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| 179 | la t0, software_init_hook
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| 180 | beq t0, zero, start_kernel
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| 181 | nop
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| 182 | jalr ra, t0
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| 183 | nop
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| 184 |
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| 185 | /*
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| 186 | * ã«ã¼ãã«ãèµ·åãã
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| 187 | */
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| 188 | start_kernel:
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| 189 | la t0, kernel_start
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| 190 | j t0
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| 191 | nop
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