1 | /* |
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2 | * __kentry.S - unified kernel entry point |
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3 | * |
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4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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6 | * |
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7 | * This file is part of ALMOS-kernel. |
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8 | * |
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9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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10 | * under the terms of the GNU General Public License as published by |
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11 | * the Free Software Foundation; version 2.0 of the License. |
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12 | * |
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13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | * General Public License for more details. |
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17 | * |
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18 | * You should have received a copy of the GNU General Public License |
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19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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21 | */ |
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22 | |
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23 | #define DECLARE_EXCEPT_ERR(n) \ |
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24 | .align 16 ; \ |
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25 | cli ; \ |
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26 | pushl $##n ; \ |
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27 | jmp unified_except_entry ; \ |
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28 | movl %eax, %eax |
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29 | |
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30 | #define DECLARE_EXCEPT(n) \ |
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31 | .align 16 ; \ |
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32 | cli ; \ |
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33 | pushl $0x0 ; \ |
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34 | pushl $##n ; \ |
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35 | jmp unified_except_entry |
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36 | |
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37 | #define DECLARE_IRQ(n) \ |
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38 | .align 16 ; \ |
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39 | cli ; \ |
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40 | pushl $0x0 ; \ |
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41 | pushl $##n ; \ |
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42 | jmp unified_irq_entry |
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43 | |
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44 | .text |
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45 | .global __except |
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46 | .align 16 |
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47 | __except: |
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48 | DECLARE_EXCEPT(0) /* Division By Zero Exception */ |
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49 | DECLARE_EXCEPT(1) /* Debug Exception */ |
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50 | DECLARE_EXCEPT(2) /* Non Maskable Interrupt Exception */ |
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51 | DECLARE_EXCEPT(3) /* Breakpoint Exception */ |
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52 | DECLARE_EXCEPT(4) /* Into Detected Overflow Exception */ |
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53 | DECLARE_EXCEPT(5) /* Out of Bounds Exception */ |
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54 | DECLARE_EXCEPT(6) /* Invalid Opcode Exception */ |
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55 | DECLARE_EXCEPT(7) /* No Coprocessor Exception */ |
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56 | DECLARE_EXCEPT_ERR(8) /* Double Fault Exception */ |
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57 | DECLARE_EXCEPT(9) /* Coprocessor Segment Overrun Exception */ |
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58 | DECLARE_EXCEPT_ERR(10) /* Bad TSS Exception */ |
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59 | DECLARE_EXCEPT_ERR(11) /* Segment Not Present Exception */ |
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60 | DECLARE_EXCEPT_ERR(12) /* Stack Fault Exception */ |
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61 | DECLARE_EXCEPT_ERR(13) /* General Protection Fault Exception */ |
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62 | DECLARE_EXCEPT_ERR(14) /* Page Fault Exception */ |
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63 | DECLARE_EXCEPT(15) /* Unknown Interrupt Exception */ |
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64 | DECLARE_EXCEPT(16) /* Coprocessor Fault Exception */ |
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65 | DECLARE_EXCEPT(17) /* Alignment Check Exception (486+) */ |
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66 | DECLARE_EXCEPT(18) /* Machine Check Exception (Pentium/586+) */ |
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67 | DECLARE_EXCEPT(19) /* Reserved */ |
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68 | DECLARE_EXCEPT(20) /* Reserved */ |
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69 | DECLARE_EXCEPT(21) /* Reserved */ |
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70 | DECLARE_EXCEPT(22) /* Reserved */ |
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71 | DECLARE_EXCEPT(23) /* Reserved */ |
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72 | DECLARE_EXCEPT(24) /* Reserved */ |
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73 | DECLARE_EXCEPT(25) /* Reserved */ |
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74 | DECLARE_EXCEPT(26) /* Reserved */ |
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75 | DECLARE_EXCEPT(27) /* Reserved */ |
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76 | DECLARE_EXCEPT(28) /* Reserved */ |
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77 | DECLARE_EXCEPT(29) /* Reserved */ |
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78 | DECLARE_EXCEPT(30) /* Reserved */ |
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79 | DECLARE_EXCEPT(31) /* Reserved */ |
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80 | |
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81 | .text |
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82 | .global __irq |
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83 | .align 16 |
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84 | __irq: |
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85 | DECLARE_IRQ(0) |
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86 | DECLARE_IRQ(1) |
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87 | DECLARE_IRQ(2) |
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88 | DECLARE_IRQ(3) |
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89 | DECLARE_IRQ(4) |
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90 | DECLARE_IRQ(5) |
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91 | DECLARE_IRQ(6) |
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92 | DECLARE_IRQ(7) |
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93 | DECLARE_IRQ(8) |
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94 | DECLARE_IRQ(9) |
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95 | DECLARE_IRQ(10) |
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96 | DECLARE_IRQ(11) |
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97 | DECLARE_IRQ(12) |
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98 | DECLARE_IRQ(13) |
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99 | DECLARE_IRQ(14) |
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100 | DECLARE_IRQ(15) |
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101 | DECLARE_IRQ(16) |
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102 | DECLARE_IRQ(17) |
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103 | DECLARE_IRQ(18) |
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104 | DECLARE_IRQ(19) |
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105 | DECLARE_IRQ(20) |
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106 | DECLARE_IRQ(21) |
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107 | DECLARE_IRQ(22) |
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108 | DECLARE_IRQ(23) |
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109 | DECLARE_IRQ(24) |
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110 | DECLARE_IRQ(25) |
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111 | DECLARE_IRQ(26) |
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112 | DECLARE_IRQ(27) |
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113 | DECLARE_IRQ(28) |
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114 | DECLARE_IRQ(29) |
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115 | DECLARE_IRQ(30) |
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116 | DECLARE_IRQ(31) |
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117 | DECLARE_IRQ(32) |
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118 | DECLARE_IRQ(33) |
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119 | DECLARE_IRQ(34) |
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120 | DECLARE_IRQ(35) |
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121 | DECLARE_IRQ(36) |
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122 | DECLARE_IRQ(37) |
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123 | DECLARE_IRQ(38) |
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124 | DECLARE_IRQ(39) |
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125 | DECLARE_IRQ(40) |
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126 | DECLARE_IRQ(41) |
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127 | DECLARE_IRQ(42) |
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128 | DECLARE_IRQ(43) |
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129 | DECLARE_IRQ(44) |
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130 | DECLARE_IRQ(45) |
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131 | DECLARE_IRQ(46) |
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132 | DECLARE_IRQ(47) |
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133 | DECLARE_IRQ(48) |
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134 | DECLARE_IRQ(49) |
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135 | DECLARE_IRQ(50) |
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136 | DECLARE_IRQ(51) |
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137 | DECLARE_IRQ(52) |
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138 | DECLARE_IRQ(53) |
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139 | DECLARE_IRQ(54) |
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140 | DECLARE_IRQ(55) |
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141 | DECLARE_IRQ(56) |
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142 | DECLARE_IRQ(57) |
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143 | DECLARE_IRQ(58) |
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144 | DECLARE_IRQ(59) |
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145 | DECLARE_IRQ(60) |
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146 | DECLARE_IRQ(61) |
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147 | DECLARE_IRQ(62) |
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148 | DECLARE_IRQ(63) |
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149 | DECLARE_IRQ(64) /* End of Available IRQ in this version, this is also the syscall gate (INT 96). |
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150 | * this value is used by PIC_IRQ_MAX macor */ |
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151 | |
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152 | #define SAVE_REGS \ |
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153 | pusha ; \ |
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154 | push %ds ; \ |
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155 | push %es ; \ |
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156 | push %fs ; \ |
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157 | push %gs ; \ |
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158 | |
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159 | #define RESTORE_REGS \ |
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160 | pop %gs ; \ |
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161 | pop %fs ; \ |
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162 | pop %es ; \ |
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163 | pop %ds ; \ |
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164 | popa |
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165 | |
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166 | #define LOAD_KERNEL_SEGMENT \ |
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167 | mov $0x10, %ax ; \ |
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168 | mov %ax, %ds ; \ |
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169 | mov %ax, %es ; \ |
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170 | mov %ax, %fs ; \ |
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171 | mov %ax, %gs ; \ |
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172 | |
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173 | .extern __do_exception |
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174 | .extern __do_interrupt |
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175 | |
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176 | unified_except_entry: |
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177 | SAVE_REGS |
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178 | LOAD_KERNEL_SEGMENT |
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179 | mov %esp, %eax |
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180 | push %eax |
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181 | call __do_exception |
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182 | pop %eax |
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183 | RESTORE_REGS |
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184 | add $0x8, %esp |
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185 | iret |
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186 | |
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187 | unified_irq_entry: |
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188 | SAVE_REGS |
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189 | LOAD_KERNEL_SEGMENT |
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190 | mov %esp, %eax |
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191 | push %eax |
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192 | call __do_interrupt |
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193 | pop %eax |
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194 | RESTORE_REGS |
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195 | add $0x8, %esp |
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196 | iret |
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197 | |
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