1 | # |
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2 | # Copyright (c) 2006 Martin Decky |
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3 | # Copyright (c) 2006 Jakub Jermar |
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4 | # All rights reserved. |
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5 | # |
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6 | # Redistribution and use in source and binary forms, with or without |
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7 | # modification, are permitted provided that the following conditions |
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8 | # are met: |
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9 | # |
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10 | # - Redistributions of source code must retain the above copyright |
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11 | # notice, this list of conditions and the following disclaimer. |
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12 | # - Redistributions in binary form must reproduce the above copyright |
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13 | # notice, this list of conditions and the following disclaimer in the |
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14 | # documentation and/or other materials provided with the distribution. |
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15 | # - The name of the author may not be used to endorse or promote products |
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16 | # derived from this software without specific prior written permission. |
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17 | # |
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18 | # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | # |
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29 | |
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30 | /* |
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31 | * start.S |
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32 | * |
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33 | * Start code for Sparc64 RTEMS |
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34 | * |
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35 | * This is based on the boot.S file of the HelenOS sparc64 architecture. |
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36 | * http://www.helenos.org/ |
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37 | * ${helenos}/boot/arch/sparc64/loader/boot.S |
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38 | * |
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39 | * Modifications for the RTEMS executive are |
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40 | * COPYRIGHT (c) 2010 Gedare Bloom. |
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41 | * COPYRIGHT (c) 2010 Eugen Leontie. |
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42 | * |
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43 | * $Id$ |
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44 | */ |
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45 | |
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46 | #include <rtems/asm.h> |
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47 | #include <rtems/score/cpu.h> |
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48 | |
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49 | #define PSTATE_PRIV_BIT 4 |
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50 | |
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51 | .register %g2, #scratch |
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52 | .register %g3, #scratch |
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53 | .register %g6, #scratch |
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54 | .register %g7, #scratch |
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55 | |
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56 | #if 0 |
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57 | #define _BSP_DEBUG |
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58 | #endif |
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59 | |
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60 | #if _BSP_DEBUG |
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61 | /* |
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62 | * This is for debug and script support to identify RTEMS app termination |
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63 | */ |
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64 | .section .data |
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65 | .align 8 |
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66 | _end_token_string: |
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67 | .asciz "END_TOKEN\n" |
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68 | #endif |
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69 | |
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70 | .section BOOTSTRAP, "ax" |
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71 | |
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72 | PUBLIC(_start) |
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73 | .global _start |
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74 | SYM(_start): |
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75 | start: |
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76 | b 1f |
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77 | nop |
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78 | |
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79 | /* |
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80 | * This header forces SILO to load the image at 0x4000. |
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81 | * More precisely, SILO will think this is an old version of Linux. |
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82 | */ |
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83 | .ascii "HdrS" |
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84 | .word 0 |
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85 | .half 0 |
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86 | .half 0 |
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87 | .half 0 |
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88 | .half 0 |
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89 | .global silo_ramdisk_image |
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90 | silo_ramdisk_image: |
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91 | .word 0 |
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92 | .global silo_ramdisk_size |
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93 | silo_ramdisk_size: |
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94 | .word 0 |
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95 | |
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96 | .align 8 |
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97 | 1: |
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98 | /* |
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99 | * Disable interrupts and disable address masking. |
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100 | */ |
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101 | wrpr %g0, PSTATE_PRIV_BIT, %pstate |
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102 | |
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103 | wrpr %g0, SPARC_NUMBER_OF_REGISTER_WINDOWS - 2, %cansave ! set maximum saveable windows |
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104 | wrpr %g0, 0, %canrestore ! get rid of windows we will never need again |
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105 | wrpr %g0, 0, %otherwin ! make sure the window state is consistent |
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106 | wrpr %g0, SPARC_NUMBER_OF_REGISTER_WINDOWS - 1, %cleanwin ! prevent needless clean_window traps for kernel |
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107 | |
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108 | /* g4 needs to be cleared for gcc */ |
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109 | mov %g0, %g4 |
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110 | |
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111 | /* Clear the bss */ |
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112 | setx SYM(bss_start), %l0, %g2 ! g2 = start of bss |
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113 | setx SYM(_end), %l0, %g3 ! g3 = end of bss |
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114 | zerobss: |
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115 | stx %g0, [%g2] |
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116 | add %g2, 8, %g2 |
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117 | cmp %g2, %g3 |
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118 | bleu,a zerobss |
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119 | nop |
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120 | |
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121 | /* Install stack */ |
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122 | setstack: |
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123 | set SYM(StackStart), %sp |
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124 | add %sp, -STACK_BIAS, %sp |
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125 | |
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126 | setx ofw_cif, %l0, %l1 |
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127 | |
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128 | call ofw_init ! initialize OpenFirmware |
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129 | stx %o4, [%l1] |
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130 | |
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131 | call bootstrap |
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132 | nop |
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133 | |
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134 | /* BSP-specific pre-bootcard initializations */ |
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135 | call SYM(_BSP_init) |
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136 | nop |
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137 | |
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138 | /* Set up ISR handler for interrupt enable/disable */ |
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139 | setx SYM(syscall), %l0, %o1 |
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140 | setx param_space, %l0, %o2 |
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141 | call SYM(_CPU_ISR_install_raw_handler) |
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142 | mov 0x100, %o0 |
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143 | |
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144 | /* Don't need to copy initialized data to RAM--link puts all in RAM already */ |
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145 | |
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146 | mov %g0, %o0 ! clear command line passed to main |
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147 | call SYM(boot_card) |
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148 | sub %sp, 0x60, %sp ! make room on stack (necessary?) |
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149 | |
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150 | #if _BSP_DEBUG |
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151 | /* execution returns here when RTEMS terminates */ |
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152 | sethi %hi(_end_token_string), %g1 |
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153 | add %g1, %lo(_end_token_string), %o0 |
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154 | call SYM(printk) |
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155 | nop |
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156 | #endif |
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157 | |
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158 | call SYM(halt) |
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159 | nop |
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160 | |
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161 | halted: nop |
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162 | b SYM(halted) |
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163 | |
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164 | .align CPU_ALIGNMENT |
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165 | param_space: |
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166 | .space 8 |
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167 | |
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168 | .global _fini |
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169 | _fini: |
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170 | nop |
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171 | nop |
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172 | |
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173 | .global _init |
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174 | _init: |
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175 | nop |
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176 | nop |
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