1 | /* |
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2 | * $Id |
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3 | */ |
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4 | |
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5 | #include <efi332.h> |
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6 | #include <sim.h> |
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7 | #define __START_C__ |
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8 | #include "bsp.h" |
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9 | |
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10 | m68k_isr_entry M68Kvec[256]; |
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11 | m68k_isr_entry vectors[256]; |
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12 | char * const __argv[]= {"main", ""}; |
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13 | char * const __env[]= {""}; |
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14 | |
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15 | /* |
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16 | * This prototype really should have the noreturn attribute but |
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17 | * that causes a warning since it appears that the routine does |
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18 | * return. |
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19 | * |
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20 | * void dumby_start () __attribute__ ((noreturn)); |
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21 | */ |
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22 | |
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23 | void dumby_start (); |
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24 | void dumby_start() { |
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25 | |
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26 | /* We need to by-pass the link instruction since the RAM chip- |
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27 | select pins are not yet configured. */ |
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28 | asm volatile ( ".global start ; |
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29 | start:"); |
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30 | |
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31 | /* disable interrupts, load stack pointer */ |
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32 | asm volatile ( "oriw #0x0700, %sr; |
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33 | moveal #M68Kvec, %a0; |
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34 | movec %a0, %vbr; |
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35 | movel #_end, %d0; |
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36 | addl " STACK_SIZE ",%d0; |
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37 | movel %d0,%sp; |
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38 | link %a6, #0" |
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39 | ); |
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40 | |
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41 | /* include in ram_init.S */ |
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42 | /* |
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43 | * Initalize the SIM module. |
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44 | * The stack pointer is not usable until the RAM chip select lines |
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45 | * are configured. The following code must remain inline. |
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46 | */ |
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47 | |
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48 | /* Module Configuration Register */ |
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49 | /* see section(s) 3.1.3-3.1.6 of the SIM Reference Manual */ |
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50 | *SIMCR = (unsigned short int) |
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51 | (FRZSW | FRZBM | SAM(0,8,SHEN) | (MM*SIM_MM) | SAM(SIM_IARB,0,IARB)); |
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52 | |
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53 | /* Synthesizer Control Register */ |
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54 | /* see section(s) 4.8 */ |
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55 | /* end include in ram_init.S */ |
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56 | *SYNCR = (unsigned short int) |
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57 | ( SAM(EFI_W,15,W) | SAM(0x0,14,X) | SAM(EFI_Y,8,Y) | STSIM ); |
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58 | while (! (*SYNCR & SLOCK)); /* protect from clock overshoot */ |
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59 | /* include in ram_init.S */ |
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60 | *SYNCR = (unsigned short int) |
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61 | ( SAM(EFI_W,15,W) | SAM(EFI_X,14,X) | SAM(EFI_Y,8,Y) | STSIM ); |
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62 | |
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63 | /* System Protection Control Register */ |
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64 | /* !!! can only write to once after reset !!! */ |
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65 | /* see section 3.8.4 of the SIM Reference Manual */ |
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66 | *SYPCR = (unsigned char)( SAM(0x3,4,SWT) | HME | BME ); |
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67 | |
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68 | /* Periodic Interrupr Control Register */ |
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69 | /* see section 3.8.2 of the SIM Reference Manual */ |
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70 | *PICR = (unsigned short int) |
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71 | ( SAM(0,8,PIRQL) | SAM(EFI_PIV,0,PIV) ); |
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72 | /* ^^^ zero disables interrupt, don't enable here or ram_init will |
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73 | be wrong. It's enabled below. */ |
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74 | |
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75 | /* Periodic Interrupt Timer Register */ |
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76 | /* see section 3.8.3 of the SIM Reference Manual */ |
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77 | *PITR = (unsigned short int)( SAM(0x09,0,PITM) ); |
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78 | /* 1.098mS interrupt */ |
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79 | |
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80 | /* Port C Data */ |
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81 | /* load values before enabled */ |
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82 | *PORTC = (unsigned char) 0x0; |
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83 | |
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84 | /* Chip-Select Base Address Register */ |
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85 | /* see section 7 of the SIM Reference Manual */ |
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86 | *CSBARBT = (unsigned short int) |
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87 | (((0x000000 >> 8)&0xfff8) | BS_512K ); /* 512k bytes located at 0x0000 */ |
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88 | *CSBAR0 = (unsigned short int) |
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89 | (((0x000000 >> 8)&0xfff8) | BS_1M ); /* 1M bytes located at 0x0000 */ |
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90 | *CSBAR1 = (unsigned short int) |
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91 | (((0x080000 >> 8)&0xfff8) | BS_256K ); /* 256k bytes located at 0x80000 */ |
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92 | *CSBAR2 = (unsigned short int) |
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93 | (((0x080000 >> 8)&0xfff8) | BS_256K ); /* 256 bytes located at 0x80000 */ |
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94 | *CSBAR3 = (unsigned short int) |
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95 | (0xfff8 | BS_64K); /* AVEC interrupts */ |
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96 | *CSBAR10 = (unsigned short int) |
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97 | (((0x000000 >> 8)&0xfff8) | BS_512K ); /* 512k bytes located at 0x0000 */ |
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98 | |
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99 | /* Chip-Select Options Registers */ |
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100 | /* see section 7 of the SIM Reference Manual */ |
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101 | *CSORBT = (unsigned short int) |
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102 | ( BothBytes | ReadWrite | SyncAS | WaitStates_13 | UserSupSpace ); |
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103 | *CSOR0 = (unsigned short int) |
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104 | ( BothBytes | ReadOnly | SyncAS | External | UserSupSpace ); |
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105 | *CSOR1 = (unsigned short int) |
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106 | ( LowerByte | ReadWrite | SyncAS | FastTerm | UserSupSpace ); |
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107 | *CSOR2 = (unsigned short int) |
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108 | ( UpperByte | ReadWrite | SyncAS | FastTerm | UserSupSpace ); |
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109 | *CSOR3 = (unsigned short int) |
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110 | ( BothBytes | ReadWrite | SyncAS | CPUSpace | IPLevel_any | AVEC ); |
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111 | *CSOR10 = (unsigned short int) |
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112 | ( BothBytes | ReadOnly | SyncAS | External | UserSupSpace ); |
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113 | |
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114 | /* Chip Select Pin Assignment Register 0 */ |
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115 | /* see section 7 of the SIM Reference Manual */ |
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116 | *CSPAR0 = (unsigned short int)( |
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117 | SAM(DisOut,CS_5,0x3000) | /* PC2 */ |
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118 | SAM(DisOut,CS_4,0x0c00) | /* PC1 */ |
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119 | SAM(DisOut,CS_3,0x0300) | /* AVEC (internally) */ |
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120 | SAM(CS16bit,CS_2,0x00c0)| /* RAM UDS */ |
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121 | SAM(CS16bit,CS_1,0x0030)| /* RAM LDS */ |
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122 | SAM(CS16bit,CS_0,0x000c)| /* W/!R */ |
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123 | SAM(CS16bit,CSBOOT,0x0003) /* ROM DS */ |
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124 | ); |
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125 | |
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126 | /* Chip Select Pin Assignment Register 1 */ |
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127 | /* see section 7 of the SIM Reference Manual */ |
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128 | *CSPAR1 = (unsigned short int)( |
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129 | SAM(CS16bit,CS_10,0x300)| /* ECLK */ |
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130 | SAM(DisOut,CS_9,0x0c0) | /* PC6 */ |
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131 | SAM(DisOut,CS_8,0x030) | /* PC5 */ |
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132 | SAM(DisOut,CS_7,0x00c) | /* PC4 */ |
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133 | SAM(DisOut,CS_6,0x003) /* PC3 */ |
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134 | ); |
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135 | |
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136 | /* Port E and F Data Register */ |
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137 | /* see section 9 of the SIM Reference Manual */ |
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138 | *PORTE0 = (unsigned char) 0; |
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139 | *PORTF0 = (unsigned char) 0; |
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140 | |
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141 | /* Port E and F Data Direction Register */ |
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142 | /* see section 9 of the SIM Reference Manual */ |
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143 | *DDRE = (unsigned char) 0xff; |
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144 | *DDRF = (unsigned char) 0xfd; |
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145 | |
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146 | /* Port E and F Pin Assignment Register */ |
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147 | /* see section 9 of the SIM Reference Manual */ |
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148 | *PEPAR = (unsigned char) 0; |
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149 | *PFPAR = (unsigned char) 0; |
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150 | |
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151 | /* end of SIM initalization code */ |
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152 | /* end include in ram_init.S */ |
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153 | |
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154 | |
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155 | |
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156 | /* |
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157 | * Initialize RAM by copying the .data section out of ROM (if |
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158 | * needed) and "zero-ing" the .bss section. |
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159 | */ |
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160 | { |
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161 | register char *src = _endtext; |
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162 | register char *dst = _sdata; |
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163 | |
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164 | if (_copy_data_from_rom) |
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165 | /* ROM has data at end of text; copy it. */ |
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166 | while (dst < _edata) |
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167 | *dst++ = *src++; |
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168 | |
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169 | /* Zero bss */ |
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170 | for (dst = __bss_start; dst< _end; dst++) |
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171 | *dst = 0; |
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172 | } |
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173 | |
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174 | /* |
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175 | * Initalize the board. |
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176 | */ |
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177 | Spurious_Initialize(); |
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178 | console_init(); |
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179 | |
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180 | /* |
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181 | * Execute main with arguments argv and environment env |
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182 | */ |
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183 | /* main(1, __argv, __env); */ |
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184 | |
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185 | boot_card(); |
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186 | |
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187 | reboot(); |
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188 | } |
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189 | |
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190 | void reboot() {asm("trap #15");} |
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191 | |
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