1 | /* |
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2 | * Copyright (c) 2015 University of York. |
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3 | * Hesham ALMatary <hmka501@york.ac.uk> |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * |
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14 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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15 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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16 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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17 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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18 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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19 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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20 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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21 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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22 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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23 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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24 | * SUCH DAMAGE. |
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25 | */ |
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26 | #include <bsp/linker-symbols.h> |
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27 | #include <rtems/asm.h> |
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28 | |
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29 | EXTERN(bsp_section_bss_begin) |
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30 | EXTERN(bsp_section_bss_end) |
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31 | EXTERN(ISR_Handler) |
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32 | EXTERN(bsp_start_vector_table_end) |
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33 | EXTERN(bsp_start_vector_table_size) |
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34 | EXTERN(bsp_vector_table_size) |
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35 | EXTERN(bsp_section_stack_begin) |
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36 | |
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37 | PUBLIC(EPIPHANY_Exception_default) |
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38 | PUBLIC(bsp_start_vector_table_begin) |
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39 | PUBLIC(start) |
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40 | |
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41 | .section .vector, "wax" |
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42 | TYPE_FUNC(start) |
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43 | SYM(start): |
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44 | .balign 4 ; |
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45 | b .normal_start |
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46 | |
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47 | .balign 4 ; 0x4 |
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48 | b .sw_exception |
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49 | |
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50 | .balign 4 ; 0x8 |
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51 | b .normal_start |
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52 | |
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53 | .balign 4 ; 0xc |
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54 | b .clock_isr |
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55 | |
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56 | .balign 4 ; 0x10 |
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57 | b .timer1_isr |
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58 | |
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59 | .balign 4 ; 0x14 |
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60 | b _EPIPHANY_Exception_default |
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61 | |
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62 | .balign 4 ; 0x18 |
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63 | b _EPIPHANY_Exception_default |
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64 | |
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65 | .balign 4 ; 0x1c |
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66 | b _EPIPHANY_Exception_default |
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67 | |
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68 | .balign 4 ; 0x20 |
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69 | b _EPIPHANY_Exception_default |
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70 | |
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71 | .balign 4 ; 0x24 |
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72 | b _EPIPHANY_Exception_default |
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73 | |
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74 | _bsp_start_vector_table_begin: |
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75 | .word .normal_start /* Reset */ |
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76 | .word _EPIPHANY_Exception_default /* SW exception */ |
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77 | .word _EPIPHANY_Exception_default /* Data Page Fault */ |
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78 | .word _EPIPHANY_Exception_default /* Timer 0 */ |
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79 | .word _EPIPHANY_Exception_default /* Timer 1 */ |
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80 | .word _EPIPHANY_Exception_default /* Message int */ |
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81 | .word _EPIPHANY_Exception_default /* DMA0 int */ |
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82 | .word _EPIPHANY_Exception_default /* DMA1 int */ |
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83 | .word _EPIPHANY_Exception_default /* WAND */ |
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84 | .word _EPIPHANY_Exception_default /* User interrupt */ |
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85 | |
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86 | _bsp_start_vector_table_end: |
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87 | |
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88 | .size _start, .-_start |
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89 | |
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90 | .section .start,"ax" |
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91 | .align 4 |
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92 | .type _external_start, %function |
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93 | .normal_start: |
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94 | /* Initialize the stack and frame pointers */ |
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95 | mov sp, %low(bsp_section_stack_begin) |
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96 | movt sp, %high(bsp_section_stack_begin) |
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97 | mov fp, sp |
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98 | |
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99 | cpu0: |
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100 | /* Zero .bss section */ |
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101 | mov r0, %low(bsp_section_bss_begin) |
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102 | movt r0, %high(bsp_section_bss_begin) |
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103 | mov r1, sp |
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104 | mov r2,#0 |
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105 | mov r3,#0 |
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106 | |
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107 | _bss_clear_loop: |
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108 | strd r2, [r0], +#1 |
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109 | sub r5, r1, r0 |
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110 | bne _bss_clear_loop |
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111 | |
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112 | /* Clear the reset interrupt flag */ |
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113 | mov r0, %low(_jump_to_c) |
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114 | movt r0, %high(_jump_to_c) |
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115 | movts iret, r0 |
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116 | rti |
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117 | |
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118 | _jump_to_c: |
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119 | /* Jump to bootcard */ |
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120 | mov r3, %low(_boot_card) |
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121 | movt r3, %high(_boot_card) |
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122 | jalr r3 |
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123 | |
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124 | /* Should never reach here */ |
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125 | idle |
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126 | |
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127 | .size .normal_start, .-.normal_start |
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128 | |
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129 | .balign 4 |
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130 | .type .sw_exception, %function |
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131 | .sw_exception: |
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132 | idle |
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133 | |
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134 | .balign 4 |
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135 | .type .clock_isr, %function |
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136 | .clock_isr: |
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137 | /* |
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138 | * r62 and r63 are saved here, and restored from _ISR_Handler, they |
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139 | * and hold vector number and _ISR_Handler address repsectively. |
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140 | */ |
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141 | add sp, sp, #-8 |
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142 | str r62, [sp, #0] |
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143 | str r63, [sp, #4] |
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144 | mov r62, 3 |
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145 | mov r63, %low(_ISR_Handler) |
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146 | movt r63, %high(_ISR_Handler) |
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147 | jr r6 |
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148 | |
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149 | .balign 4 |
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150 | .type .timer1_isr, %function |
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151 | .timer1_isr: |
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152 | /* |
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153 | * r62 and r63 are saved here, and restored from _ISR_Handler, they |
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154 | * and hold vector number and _ISR_Handler address repsectively. |
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155 | */ |
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156 | add sp, sp, #-8 |
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157 | str r62, [sp, 0] |
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158 | str r63, [sp, 4] |
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159 | mov r62, 4 |
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160 | mov r63, %low(_ISR_Handler) |
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161 | movt r63, %high(_ISR_Handler) |
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162 | jr r63 |
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163 | |
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164 | .balign 4 |
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165 | TYPE_FUNC(EPIPHANY_Exception_default) |
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166 | SYM(EPIPHANY_Exception_default): |
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167 | idle |
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