[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) 2005 by Embedded and Real-Time Systems Laboratory
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| 7 | * Graduate School of Information Science, Nagoya Univ., 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 1.5 2006/01/13 07:01:03 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 <t_config.h>
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| 55 | #include <sys_defs.h>
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| 56 |
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| 57 |
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| 58 | .section .entry, "xa"
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| 59 | .align 2
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| 60 | .global __reset
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| 61 | __reset:
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| 62 | #if NIOS2_ICACHE_SIZE > 0
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| 63 | /*
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| 64 | * The assumption here is that the instruction cache size is always
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| 65 | * a power of two.
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| 66 | */
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| 67 |
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| 68 | #if NIOS2_ICACHE_SIZE > 0x8000
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| 69 | movhi r2, %hi(NIOS2_ICACHE_SIZE)
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| 70 | #else
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| 71 | movui r2, NIOS2_ICACHE_SIZE
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| 72 | #endif
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| 73 | 0:
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| 74 | initi r2
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| 75 | addi r2, r2, -NIOS2_ICACHE_LINE_SIZE
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| 76 | bgt r2, zero, 0b
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| 77 | 1:
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| 78 |
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| 79 | .pushsection .debug_alt_sim_info
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| 80 | .int 1, 1, 0b, 1b
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| 81 | .popsection
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| 82 | #endif /* NIOS2_ICACHE_SIZE > 0 */
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| 83 |
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| 84 | #ifndef BOOT_ROM
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| 85 | movhi r3, %hiadj(_start)
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| 86 | addi r3, r3, %lo(_start)
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| 87 | jmp r3
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| 88 | #else
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| 89 | br _boot_rom
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| 90 | #endif /* BOOT_ROM */
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| 91 |
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| 92 |
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| 93 | #ifdef BOOT_ROM
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| 94 | .section .text
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| 95 | .align 2
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| 96 | .globl _
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| 97 | .type _boot_rom, @function
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| 98 | _boot_rom:
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| 99 | #if NIOS2_DCACHE_SIZE > 0
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| 100 | #if NIOS2_DCACHE_SIZE > 0x8000
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| 101 | movhi r2, %hi(NIOS2_DCACHE_SIZE)
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| 102 | #else
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| 103 | movui r2, NIOS2_DCACHE_SIZE
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| 104 | #endif
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| 105 | 0:
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| 106 | initd 0(r2)
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| 107 | addi r2, r2, -NIOS2_DCACHE_LINE_SIZE
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| 108 | bgt r2, zero, 0b
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| 109 | 1:
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| 110 | .pushsection .debug_alt_sim_info
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| 111 | .int 2, 1, 0b, 1b
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| 112 | .popsection
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| 113 | #endif /* NIOS2_DCACHE_SIZE > 0 */
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| 114 |
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| 115 | _boot_rom_1:
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| 116 | movhi r3, %hiadj(ROM_BASE) /* r3 source */
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| 117 | addi r3, r3, %lo(ROM_BASE)
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| 118 | movhi r4, %hiadj(RAM_BASE) /* r4 destination */
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| 119 | addi r4, r4, %lo(RAM_BASE)
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| 120 | movhi r2, %hiadj(_edata)
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| 121 | addi r2, r2, %lo(_edata)
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| 122 |
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| 123 | _flash_copy:
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| 124 | ldw r5, 0(r3)
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| 125 | addi r3, r3, 1
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| 126 | stw r5, 0(r4)
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| 127 | addi r4, r4, 1
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| 128 | bgeu r2, r4, _flash_copy
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| 129 |
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| 130 | movhi r2, %hiadj(_start)
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| 131 | addi r2, r2, %lo(_start)
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| 132 | jmp r2
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| 133 | nop
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| 134 |
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| 135 | #endif /* BOOT_ROM */
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| 136 |
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| 137 |
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| 138 | .section .text
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| 139 | .align 2
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| 140 | .globl _start
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| 141 | .type _start, @function
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| 142 | _start:
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| 143 | #if NIOS2_DCACHE_SIZE > 0
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| 144 | #if NIOS2_DCACHE_SIZE > 0x8000
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| 145 | movhi r2, %hi(NIOS2_DCACHE_SIZE)
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| 146 | #else
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| 147 | movui r2, NIOS2_DCACHE_SIZE
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| 148 | #endif
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| 149 | 0:
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| 150 | initd 0(r2)
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| 151 | addi r2, r2, -NIOS2_DCACHE_LINE_SIZE
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| 152 | bgt r2, zero, 0b
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| 153 | 1:
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| 154 | .pushsection .debug_alt_sim_info
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| 155 | .int 2, 1, 0b, 1b
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| 156 | .popsection
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| 157 | #endif /* NIOS2_DCACHE_SIZE > 0 */
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| 158 |
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| 159 | /*
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| 160 | * ã¹ã¿ãã¯ã®è¨å®
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| 161 | */
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| 162 | movhi sp, %hiadj(STACKTOP)
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| 163 | addi sp, sp, %lo(STACKTOP)
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| 164 |
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| 165 | /*
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| 166 | * set up the global pointer.
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| 167 | */
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| 168 | movhi gp, %hiadj(_gp)
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| 169 | addi gp, gp, %lo(_gp)
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| 170 |
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| 171 | start_0:
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| 172 | movhi r2, %hiadj(_hardware_init_hook)
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| 173 | addi r2, r2, %lo(_hardware_init_hook)
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| 174 | beq zero, r2, start_1
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| 175 | callr r2
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| 176 |
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| 177 | /*
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| 178 | * Clear bss.
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| 179 | */
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| 180 | start_1:
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| 181 | movhi r3, %hiadj(__bss_start)
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| 182 | addi r3, r3, %lo(__bss_start)
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| 183 |
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| 184 | movhi r2, %hiadj(__bss_end)
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| 185 | addi r2, r2, %lo(__bss_end)
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| 186 |
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| 187 | beq r3, r2, start_3
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| 188 | start_2:
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| 189 | stw zero, (r3)
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| 190 | addi r3, r3, 4
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| 191 | bltu r3, r2, start_2
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| 192 |
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| 193 | start_3:
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| 194 | movhi r2, %hiadj(_software_init_hook)
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| 195 | addi r2, r2, %lo(_software_init_hook)
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| 196 | beq zero, r2, start_4
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| 197 | callr r2
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| 198 |
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| 199 | start_4:
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| 200 |
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| 201 | call kernel_start
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| 202 |
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| 203 | crt0_end:
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| 204 | br crt0_end
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