1 | #warning Call to boot_card has changed and needs checking. |
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2 | #warning The call is "void boot_card(const char* cmdline);" |
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3 | #warning You need to pass a NULL. |
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4 | #warning Please check and remove these warnings. |
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5 | |
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6 | @--------------------------------------------------------------------------------- |
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7 | @ DS processor selection |
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8 | @--------------------------------------------------------------------------------- |
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9 | .arch armv5te |
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10 | .cpu arm946e-s |
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11 | @--------------------------------------------------------------------------------- |
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12 | #define PAGE_4K (0b01011 << 1) |
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13 | #define PAGE_8K (0b01100 << 1) |
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14 | #define PAGE_16K (0b01101 << 1) |
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15 | #define PAGE_32K (0b01110 << 1) |
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16 | #define PAGE_64K (0b00111 << 1) |
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17 | #define PAGE_128K (0b10000 << 1) |
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18 | #define PAGE_256K (0b10001 << 1) |
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19 | #define PAGE_512K (0b10010 << 1) |
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20 | #define PAGE_1M (0b10011 << 1) |
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21 | #define PAGE_2M (0b10100 << 1) |
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22 | #define PAGE_4M (0b10101 << 1) |
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23 | #define PAGE_8M (0b10110 << 1) |
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24 | #define PAGE_16M (0b10111 << 1) |
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25 | #define PAGE_32M (0b11000 << 1) |
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26 | #define PAGE_64M (0b11001 << 1) |
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27 | #define PAGE_128M (0b11010 << 1) |
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28 | #define PAGE_256M (0b11011 << 1) |
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29 | #define PAGE_512M (0b11100 << 1) |
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30 | #define PAGE_1G (0b11101 << 1) |
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31 | #define PAGE_2G (0b11110 << 1) |
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32 | #define PAGE_4G (0b11111 << 1) |
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33 | |
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34 | #define ITCM_LOAD (1<<19) |
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35 | #define ITCM_ENABLE (1<<18) |
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36 | #define DTCM_LOAD (1<<17) |
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37 | #define DTCM_ENABLE (1<<16) |
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38 | #define DISABLE_TBIT (1<<15) |
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39 | #define ROUND_ROBIN (1<<14) |
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40 | #define ALT_VECTORS (1<<13) |
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41 | #define ICACHE_ENABLE (1<<12) |
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42 | #define BIG_ENDIAN (1<<7) |
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43 | #define DCACHE_ENABLE (1<<2) |
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44 | #define PROTECT_ENABLE (1<<0) |
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45 | |
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46 | .equ _libnds_argv,0x027FFF70 |
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47 | |
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48 | @--------------------------------------------------------------------------------- |
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49 | .section ".init" |
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50 | .global _start |
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51 | @--------------------------------------------------------------------------------- |
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52 | .align 4 |
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53 | .arm |
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54 | @--------------------------------------------------------------------------------- |
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55 | _start: |
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56 | @--------------------------------------------------------------------------------- |
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57 | mov r0, #0x04000000 @ IME = 0; |
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58 | str r0, [r0, #0x208] |
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59 | |
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60 | @--------------------------------------------------------------------------------- |
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61 | @ turn the power on for M3 |
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62 | @--------------------------------------------------------------------------------- |
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63 | ldr r1, =0x8203 |
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64 | add r0,r0,#0x304 |
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65 | strh r1, [r0] |
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66 | |
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67 | ldr r1, =0x00002078 @ disable TCM and protection unit |
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68 | mcr p15, 0, r1, c1, c0 |
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69 | |
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70 | @--------------------------------------------------------------------------------- |
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71 | @ Protection Unit Setup added by Sasq |
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72 | @--------------------------------------------------------------------------------- |
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73 | @ Disable cache |
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74 | mov r0, #0 |
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75 | mcr p15, 0, r0, c7, c5, 0 @ Instruction cache |
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76 | mcr p15, 0, r0, c7, c6, 0 @ Data cache |
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77 | |
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78 | @ Wait for write buffer to empty |
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79 | mcr p15, 0, r0, c7, c10, 4 |
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80 | |
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81 | ldr r0, =__dtcm_start |
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82 | orr r0,r0,#0x0a |
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83 | mcr p15, 0, r0, c9, c1,0 @ DTCM base = __dtcm_start, size = 16 KB |
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84 | |
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85 | mov r0,#0x20 |
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86 | mcr p15, 0, r0, c9, c1,1 @ ITCM base = 0 , size = 32 MB |
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87 | |
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88 | @--------------------------------------------------------------------------------- |
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89 | @ Setup memory regions similar to Release Version |
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90 | @--------------------------------------------------------------------------------- |
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91 | |
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92 | @------------------------------------------------------------------------- |
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93 | @ Region 0 - IO registers |
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94 | @------------------------------------------------------------------------- |
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95 | ldr r0,=( PAGE_64M | 0x04000000 | 1) |
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96 | mcr p15, 0, r0, c6, c0, 0 |
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97 | |
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98 | @------------------------------------------------------------------------- |
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99 | @ Region 1 - Main Memory |
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100 | @------------------------------------------------------------------------- |
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101 | ldr r0,=( PAGE_4M | 0x02000000 | 1) |
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102 | mcr p15, 0, r0, c6, c1, 0 |
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103 | |
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104 | @------------------------------------------------------------------------- |
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105 | @ Region 2 - iwram |
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106 | @------------------------------------------------------------------------- |
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107 | ldr r0,=( PAGE_32K | 0x037F8000 | 1) |
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108 | mcr p15, 0, r0, c6, c2, 0 |
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109 | |
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110 | @------------------------------------------------------------------------- |
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111 | @ Region 3 - DS Accessory (GBA Cart) |
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112 | @------------------------------------------------------------------------- |
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113 | ldr r0,=( PAGE_128M | 0x08000000 | 1) |
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114 | mcr p15, 0, r0, c6, c3, 0 |
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115 | |
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116 | @------------------------------------------------------------------------- |
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117 | @ Region 4 - DTCM |
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118 | @------------------------------------------------------------------------- |
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119 | ldr r0,=__dtcm_start |
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120 | orr r0,r0,#(PAGE_16K | 1) |
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121 | mcr p15, 0, r0, c6, c4, 0 |
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122 | |
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123 | @------------------------------------------------------------------------- |
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124 | @ Region 5 - ITCM |
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125 | @------------------------------------------------------------------------- |
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126 | ldr r0,=__itcm_start |
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127 | orr r0,r0,#(PAGE_32K | 1) |
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128 | mcr p15, 0, r0, c6, c5, 0 |
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129 | |
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130 | @------------------------------------------------------------------------- |
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131 | @ Region 6 - System ROM |
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132 | @------------------------------------------------------------------------- |
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133 | ldr r0,=( PAGE_32K | 0xFFFF0000 | 1) |
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134 | mcr p15, 0, r0, c6, c6, 0 |
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135 | |
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136 | @------------------------------------------------------------------------- |
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137 | @ Region 7 - non cacheable main ram |
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138 | @------------------------------------------------------------------------- |
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139 | ldr r0,=( PAGE_4M | 0x02400000 | 1) |
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140 | mcr p15, 0, r0, c6, c7, 0 |
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141 | |
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142 | @------------------------------------------------------------------------- |
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143 | @ Write buffer enable |
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144 | @------------------------------------------------------------------------- |
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145 | ldr r0,=0b00000010 |
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146 | mcr p15, 0, r0, c3, c0, 0 |
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147 | |
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148 | @------------------------------------------------------------------------- |
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149 | @ DCache & ICache enable |
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150 | @------------------------------------------------------------------------- |
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151 | ldr r0,=0b01000010 |
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152 | mcr p15, 0, r0, c2, c0, 0 |
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153 | mcr p15, 0, r0, c2, c0, 1 |
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154 | |
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155 | @------------------------------------------------------------------------- |
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156 | @ IAccess |
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157 | @------------------------------------------------------------------------- |
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158 | ldr r0,=0x36636333 |
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159 | mcr p15, 0, r0, c5, c0, 3 |
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160 | |
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161 | @------------------------------------------------------------------------- |
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162 | @ DAccess |
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163 | @------------------------------------------------------------------------- |
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164 | ldr r0,=0x36333333 |
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165 | mcr p15, 0, r0, c5, c0, 2 |
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166 | |
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167 | @------------------------------------------------------------------------- |
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168 | @ Enable ICache, DCache, ITCM & DTCM |
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169 | @------------------------------------------------------------------------- |
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170 | mrc p15, 0, r0, c1, c0, 0 |
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171 | ldr r1,= ITCM_ENABLE | DTCM_ENABLE | ICACHE_ENABLE | DCACHE_ENABLE | PROTECT_ENABLE |
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172 | orr r0,r0,r1 |
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173 | mcr p15, 0, r0, c1, c0, 0 |
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174 | |
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175 | mov r0, #0x12 @ Switch to IRQ Mode |
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176 | msr cpsr, r0 |
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177 | ldr sp, =__sp_irq @ Set IRQ stack |
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178 | |
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179 | mov r0, #0x1f @ Switch to SVC Mode |
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180 | msr cpsr, r0 |
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181 | ldr sp, =__sp_usr @ Set user stack |
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182 | |
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183 | ldr r1, =__itcm_lma @ Copy instruction tightly coupled memory (itcm section) from LMA to VMA (ROM to RAM) |
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184 | ldr r2, =__itcm_start |
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185 | ldr r4, =__itcm_end |
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186 | bl CopyMemCheck |
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187 | |
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188 | ldr r1, =__dtcm_lma @ Copy data tightly coupled memory (dtcm section) from LMA to VMA (ROM to RAM) |
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189 | ldr r2, =__dtcm_start |
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190 | ldr r4, =__dtcm_end |
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191 | bl CopyMemCheck |
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192 | |
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193 | ldr r0, =__bss_start @ Clear BSS section |
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194 | ldr r1, =__bss_end |
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195 | sub r1, r1, r0 |
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196 | bl ClearMem |
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197 | |
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198 | ldr r0, =__sbss_start @ Clear SBSS section |
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199 | ldr r1, =__sbss_end |
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200 | sub r1, r1, r0 |
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201 | bl ClearMem |
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202 | |
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203 | ldr r3, =__libc_init_array @ global constructors |
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204 | blx r3 |
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205 | |
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206 | ldr r3, =initSystem |
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207 | blx r3 @ jump to user code |
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208 | |
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209 | mov r0, #0 @ command line |
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210 | |
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211 | |
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212 | ldr r3, =boot_card |
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213 | blx r3 @ jump to user code |
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214 | |
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215 | @ If the user ever returns, go back to passme loop |
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216 | ldr r0, =ILoop |
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217 | ldr r0, [r0] |
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218 | ldr r1, =0x027FFE78 |
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219 | str r0, [r1] |
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220 | bx r1 |
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221 | ILoop: |
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222 | b ILoop |
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223 | |
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224 | |
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225 | @--------------------------------------------------------------------------------- |
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226 | @ Clear memory to 0x00 if length != 0 |
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227 | @ r0 = Start Address |
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228 | @ r1 = Length |
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229 | @--------------------------------------------------------------------------------- |
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230 | ClearMem: |
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231 | @--------------------------------------------------------------------------------- |
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232 | mov r2, #3 @ Round down to nearest word boundary |
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233 | add r1, r1, r2 @ Shouldn't be needed |
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234 | bics r1, r1, r2 @ Clear 2 LSB (and set Z) |
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235 | bxeq lr @ Quit if copy size is 0 |
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236 | |
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237 | mov r2, #0 |
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238 | ClrLoop: |
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239 | stmia r0!, {r2} |
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240 | subs r1, r1, #4 |
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241 | bne ClrLoop |
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242 | |
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243 | bx lr |
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244 | |
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245 | @--------------------------------------------------------------------------------- |
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246 | @ Copy memory if length != 0 |
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247 | @ r1 = Source Address |
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248 | @ r2 = Dest Address |
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249 | @ r4 = Dest Address + Length |
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250 | @--------------------------------------------------------------------------------- |
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251 | CopyMemCheck: |
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252 | @--------------------------------------------------------------------------------- |
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253 | sub r3, r4, r2 @ Is there any data to copy? |
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254 | @--------------------------------------------------------------------------------- |
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255 | @ Copy memory |
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256 | @ r1 = Source Address |
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257 | @ r2 = Dest Address |
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258 | @ r3 = Length |
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259 | @--------------------------------------------------------------------------------- |
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260 | CopyMem: |
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261 | @--------------------------------------------------------------------------------- |
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262 | mov r0, #3 @ These commands are used in cases where |
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263 | add r3, r3, r0 @ the length is not a multiple of 4, |
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264 | bics r3, r3, r0 @ even though it should be. |
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265 | bxeq lr @ Length is zero, so exit |
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266 | CIDLoop: |
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267 | ldmia r1!, {r0} |
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268 | stmia r2!, {r0} |
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269 | subs r3, r3, #4 |
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270 | bne CIDLoop |
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271 | |
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272 | bx lr |
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273 | |
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274 | |
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275 | .global SWI_Handler |
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276 | .global do_data_abort |
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277 | SWI_Handler: |
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278 | do_data_abort: |
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279 | mov pc, lr |
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280 | |
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281 | @--------------------------------------------------------------------------------- |
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282 | .align |
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283 | .pool |
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284 | .end |
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285 | @--------------------------------------------------------------------------------- |
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