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Rev | Author | Line No. | Line |
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2 | pj | 1 | /* Project: OSLib |
2 | * Description: The OS Construction Kit |
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3 | * Date: 1.6.2000 |
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4 | * Idea by: Luca Abeni & Gerardo Lamastra |
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5 | * |
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6 | * OSLib is an SO project aimed at developing a common, easy-to-use |
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7 | * low-level infrastructure for developing OS kernels and Embedded |
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8 | * Applications; it partially derives from the HARTIK project but it |
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9 | * currently is independently developed. |
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10 | * |
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11 | * OSLib is distributed under GPL License, and some of its code has |
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12 | * been derived from the Linux kernel source; also some important |
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13 | * ideas come from studying the DJGPP go32 extender. |
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14 | * |
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15 | * We acknowledge the Linux Community, Free Software Foundation, |
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16 | * D.J. Delorie and all the other developers who believe in the |
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17 | * freedom of software and ideas. |
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18 | * |
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19 | * For legalese, check out the included GPL license. |
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20 | */ |
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21 | |||
22 | /* Exc/IRQ handlers (asm part) */ |
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23 | /* TODO: Unify the Exc/Int Mechanism... */ |
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24 | |||
25 | #include <ll/i386/sel.h> |
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26 | #include <ll/i386/linkage.h> |
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27 | #include <ll/i386/int.h> |
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28 | #include <ll/i386/defs.h> |
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29 | |||
30 | .extern SYMBOL_NAME(GDT_base) |
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31 | .data |
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32 | |||
33 | ASMFILE(Exc) |
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34 | |||
35 | .globl SYMBOL_NAME(ll_irq_table) |
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36 | |||
40 | pj | 37 | SYMBOL_NAME_LABEL(ll_irq_table) .space 1024, 0 |
2 | pj | 38 | |
39 | .text |
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40 | |||
41 | .extern SYMBOL_NAME(ll_exc_hook) |
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42 | .extern SYMBOL_NAME(ll_FPU_hook) |
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43 | |||
44 | .globl SYMBOL_NAME(h13_bis) |
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45 | .globl SYMBOL_NAME(exc7) |
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46 | |||
47 | /* These are the hardware handlers; they all jump to ll_handler setting */ |
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48 | /* the interrupt number into EAX & save the registers on stack */ |
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40 | pj | 49 | INT(0) |
2 | pj | 50 | INT(1) |
51 | INT(2) |
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52 | INT(3) |
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53 | INT(4) |
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54 | INT(5) |
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55 | INT(6) |
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56 | INT(8) |
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57 | INT(9) |
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58 | INT(10) |
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59 | INT(11) |
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60 | INT(12) |
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61 | INT(13) |
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62 | INT(14) |
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63 | INT(15) |
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40 | pj | 64 | INT(16) |
65 | INT(17) |
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66 | INT(18) |
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67 | INT(19) |
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68 | INT(20) |
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69 | INT(21) |
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70 | INT(22) |
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71 | INT(23) |
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72 | INT(24) |
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73 | INT(25) |
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74 | INT(26) |
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75 | INT(27) |
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76 | INT(28) |
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77 | INT(29) |
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78 | INT(30) |
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79 | INT(31) |
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2 | pj | 80 | |
40 | pj | 81 | INT(32) |
82 | INT(33) |
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83 | INT(34) |
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84 | INT(35) |
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85 | INT(36) |
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86 | INT(37) |
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87 | INT(38) |
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88 | INT(39) |
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89 | INT(40) |
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90 | INT(41) |
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91 | INT(42) |
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92 | INT(43) |
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93 | INT(44) |
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94 | INT(45) |
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95 | INT(46) |
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96 | INT(47) |
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97 | INT(48) |
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98 | INT(49) |
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99 | INT(50) |
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100 | INT(51) |
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101 | INT(52) |
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102 | INT(53) |
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103 | INT(54) |
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104 | INT(55) |
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105 | INT(56) |
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106 | INT(57) |
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107 | INT(58) |
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108 | INT(59) |
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109 | INT(60) |
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110 | INT(61) |
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111 | INT(62) |
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112 | INT(63) |
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2 | pj | 113 | |
40 | pj | 114 | /* Master PIC... (int 0x40, see ll/i386/pic.h)*/ |
115 | INT_1(64) |
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116 | INT_1(65) |
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117 | INT_1(66) |
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118 | INT_1(67) |
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119 | INT_1(68) |
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120 | INT_1(69) |
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121 | INT_1(70) |
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122 | INT_1(71) |
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123 | |||
124 | INT(72) |
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125 | INT(73) |
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126 | INT(74) |
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127 | INT(75) |
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128 | INT(76) |
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129 | INT(77) |
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130 | INT(78) |
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131 | INT(79) |
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132 | INT(80) |
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133 | INT(81) |
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134 | INT(82) |
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135 | INT(83) |
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136 | INT(84) |
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137 | INT(85) |
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138 | INT(86) |
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139 | INT(87) |
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140 | INT(88) |
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141 | INT(89) |
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142 | INT(90) |
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143 | INT(91) |
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144 | INT(92) |
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145 | INT(93) |
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146 | INT(94) |
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147 | INT(95) |
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148 | INT(96) |
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149 | INT(97) |
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150 | INT(98) |
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151 | INT(99) |
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152 | INT(100) |
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153 | INT(101) |
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154 | INT(102) |
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155 | INT(103) |
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156 | INT(104) |
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157 | INT(105) |
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158 | INT(106) |
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159 | INT(107) |
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160 | INT(108) |
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161 | INT(109) |
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162 | INT(110) |
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163 | INT(111) |
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164 | |||
165 | /* Slave PIC... (int 0x70, see ll/i386/pic.h)*/ |
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166 | INT_2(112) |
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167 | INT_2(113) |
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168 | INT_2(114) |
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169 | INT_2(115) |
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170 | INT_2(116) |
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171 | INT_2(117) |
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172 | INT_2(118) |
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173 | INT_2(119) |
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174 | |||
175 | INT(120) |
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176 | INT(121) |
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177 | INT(122) |
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178 | INT(123) |
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179 | INT(124) |
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180 | INT(125) |
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181 | INT(126) |
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182 | INT(127) |
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183 | INT(128) |
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184 | INT(129) |
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185 | INT(130) |
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186 | INT(131) |
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187 | INT(132) |
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188 | INT(133) |
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189 | INT(134) |
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190 | INT(135) |
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191 | INT(136) |
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192 | INT(137) |
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193 | INT(138) |
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194 | INT(139) |
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195 | INT(140) |
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196 | INT(141) |
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197 | INT(142) |
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198 | INT(143) |
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199 | INT(144) |
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200 | INT(145) |
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201 | INT(146) |
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202 | INT(147) |
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203 | INT(148) |
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204 | INT(149) |
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205 | INT(150) |
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206 | INT(151) |
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207 | INT(152) |
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208 | INT(153) |
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209 | INT(154) |
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210 | INT(155) |
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211 | INT(156) |
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212 | INT(157) |
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213 | INT(158) |
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214 | INT(159) |
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215 | INT(160) |
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216 | INT(161) |
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217 | INT(162) |
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218 | INT(163) |
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219 | INT(164) |
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220 | INT(165) |
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221 | INT(166) |
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222 | INT(167) |
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223 | INT(168) |
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224 | INT(169) |
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225 | INT(170) |
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226 | INT(171) |
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227 | INT(172) |
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228 | INT(173) |
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229 | INT(174) |
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230 | INT(175) |
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231 | INT(176) |
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232 | INT(177) |
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233 | INT(178) |
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234 | INT(179) |
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235 | INT(180) |
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236 | INT(181) |
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237 | INT(182) |
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238 | INT(183) |
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239 | INT(184) |
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240 | INT(185) |
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241 | INT(186) |
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242 | INT(187) |
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243 | INT(188) |
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244 | INT(189) |
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245 | INT(190) |
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246 | INT(191) |
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247 | INT(192) |
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248 | INT(193) |
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249 | INT(194) |
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250 | INT(195) |
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251 | INT(196) |
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252 | INT(197) |
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253 | INT(198) |
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254 | INT(199) |
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255 | INT(200) |
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256 | INT(201) |
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257 | INT(202) |
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258 | INT(203) |
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259 | INT(204) |
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260 | INT(205) |
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261 | INT(206) |
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262 | INT(207) |
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263 | INT(208) |
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264 | INT(209) |
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265 | INT(210) |
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266 | INT(211) |
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267 | INT(212) |
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268 | INT(213) |
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269 | INT(214) |
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270 | INT(215) |
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271 | INT(216) |
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272 | INT(217) |
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273 | INT(218) |
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274 | INT(219) |
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275 | INT(220) |
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276 | INT(221) |
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277 | INT(222) |
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278 | INT(223) |
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279 | INT(224) |
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280 | INT(225) |
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281 | INT(226) |
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282 | INT(227) |
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283 | INT(228) |
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284 | INT(229) |
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285 | INT(230) |
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286 | INT(231) |
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287 | INT(232) |
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288 | INT(233) |
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289 | INT(234) |
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290 | INT(235) |
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291 | INT(236) |
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292 | INT(237) |
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293 | INT(238) |
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294 | INT(239) |
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295 | INT(240) |
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296 | INT(241) |
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297 | INT(242) |
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298 | INT(243) |
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299 | INT(244) |
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300 | INT(245) |
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301 | INT(246) |
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302 | INT(247) |
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303 | INT(248) |
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304 | INT(249) |
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305 | INT(250) |
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306 | INT(251) |
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307 | INT(252) |
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308 | INT(253) |
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309 | INT(254) |
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310 | INT(255) |
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311 | |||
2 | pj | 312 | /* The ll_handler process the request using the kernel function act_int() */ |
313 | /* Then sends EOI & schedules any eventual new task! */ |
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314 | |||
315 | ll_handler: |
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316 | /* We do not know what is the DS value */ |
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317 | /* Then we save it & set it correctly */ |
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318 | |||
319 | pushl %ds |
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320 | pushl %ss |
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321 | pushl %es |
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322 | pushl %fs |
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40 | pj | 323 | pushl %gs |
2 | pj | 324 | /* But we first transfer to the _act_int */ |
325 | /* the interrupt number which is required */ |
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326 | /* as second argument */ |
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327 | pushl %eax |
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328 | movw $(X_FLATDATA_SEL),%ax |
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329 | movw %ax,%es |
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330 | mov %ax,%ds |
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40 | pj | 331 | movw %ax, %fs |
332 | movw %ax, %gs |
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2 | pj | 333 | |
334 | /* Now save the actual context on stack */ |
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335 | /* to pass it to _act_int (C caling convention) */ |
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336 | /* CLD is necessary when calling a C function */ |
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337 | |||
338 | cld |
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339 | |||
340 | /* The following could be optimized a little... */ |
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341 | popl %eax |
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342 | xorl %ebx, %ebx |
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343 | movw %ss, %bx |
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344 | /* We must switch to a ``safe stack'' */ |
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345 | /* |
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346 | * OK, this is the idea: in %esp we have the address of the |
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347 | * stack pointer in the APPLICATION address space... |
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348 | * We assume that address spaces are implemented through segments... |
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349 | * What we have to do is to add the segment base to %esp: |
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350 | * - Load the GDT base in a register |
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351 | * - Add DS * 8 to that value |
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352 | * - Read the corresponding GDT entry (the segment descriptor) |
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353 | * - Compute the base... |
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354 | * It is (*p & 0xFC) | (*(p +1) & 0x0F) << 16) | *(p + 2) |
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355 | */ |
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356 | movl SYMBOL_NAME(GDT_base), %edi |
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357 | addl %ebx, %edi |
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358 | xorl %ebx, %ebx |
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359 | movb 7(%edi), %bh |
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360 | movb 4(%edi), %bl |
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361 | shl $16, %ebx |
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362 | movw 2(%edi), %bx |
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363 | /* Is it correct? I think so... Test it!!! */ |
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364 | addl %ebx, %esp |
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365 | /* Save EBX for returning to our stack... */ |
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366 | movw %ss, %dx |
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40 | pj | 367 | movw %ds, %cx |
368 | movw %cx, %ss |
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2 | pj | 369 | pushl %ebx |
370 | pushl %edx |
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371 | pushl %eax |
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372 | |||
373 | movl SYMBOL_NAME(ll_irq_table)(, %eax, 4), %ebx |
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374 | call *%ebx |
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375 | |||
376 | popl %ebx /* Store in EBX the Int number */ |
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377 | popl %eax |
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378 | popl %ecx /* We must subtract it from ESP...*/ |
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379 | subl %ecx, %esp |
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380 | movw %ax, %ss |
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381 | |||
382 | /* Resume the return value of _act_int */ |
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383 | /* & do the context switch if necessary! */ |
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384 | #ifdef __VIRCSW__ |
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385 | movw SYMBOL_NAME(currCtx), %ax |
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386 | cmpw JmpSel,%ax |
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387 | je NoPreempt3 |
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388 | movw %ax,JmpSel |
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389 | ljmp JmpZone |
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390 | #endif |
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391 | NoPreempt3: popl %gs |
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392 | popl %fs |
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393 | popl %es |
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394 | popl %ss |
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395 | popl %ds |
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396 | popal |
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397 | iret |
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398 | |||
40 | pj | 399 | ll_handler_master_pic: |
400 | /* We do not know what is the DS value */ |
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401 | /* Then we save it & set it correctly */ |
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402 | |||
403 | pushl %ds |
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2 | pj | 404 | pushl %ss |
405 | pushl %es |
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406 | pushl %fs |
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407 | pushl %gs |
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40 | pj | 408 | /* But we first transfer to the _act_int */ |
409 | /* the interrupt number which is required */ |
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410 | /* as second argument */ |
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411 | pushl %eax |
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412 | movw $(X_FLATDATA_SEL),%ax |
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413 | movw %ax,%es |
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414 | mov %ax,%ds |
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415 | movw %ax, %fs |
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416 | movw %ax, %gs |
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417 | |||
418 | /* Now save the actual context on stack */ |
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419 | /* to pass it to _act_int (C caling convention) */ |
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420 | /* CLD is necessary when calling a C function */ |
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421 | |||
2 | pj | 422 | cld |
40 | pj | 423 | |
424 | /* The following could be optimized a little... */ |
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425 | popl %eax |
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426 | xorl %ebx, %ebx |
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427 | movw %ss, %bx |
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428 | /* We must switch to a ``safe stack'' */ |
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429 | /* |
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430 | * OK, this is the idea: in %esp we have the address of the |
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431 | * stack pointer in the APPLICATION address space... |
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432 | * We assume that address spaces are implemented through segments... |
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433 | * What we have to do is to add the segment base to %esp: |
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434 | * - Load the GDT base in a register |
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435 | * - Add DS * 8 to that value |
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436 | * - Read the corresponding GDT entry (the segment descriptor) |
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437 | * - Compute the base... |
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438 | * It is (*p & 0xFC) | (*(p +1) & 0x0F) << 16) | *(p + 2) |
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439 | */ |
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440 | movl SYMBOL_NAME(GDT_base), %edi |
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441 | addl %ebx, %edi |
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442 | xorl %ebx, %ebx |
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443 | movb 7(%edi), %bh |
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444 | movb 4(%edi), %bl |
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445 | shl $16, %ebx |
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446 | movw 2(%edi), %bx |
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447 | /* Is it correct? I think so... Test it!!! */ |
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448 | addl %ebx, %esp |
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449 | /* Save EBX for returning to our stack... */ |
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450 | movw %ss, %dx |
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451 | movw %ds, %cx |
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452 | movw %cx, %ss |
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453 | pushl %ebx |
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454 | pushl %edx |
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455 | pushl %eax |
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456 | |||
457 | movl SYMBOL_NAME(ll_irq_table)(, %eax, 4), %ebx |
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458 | call *%ebx |
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459 | |||
460 | popl %ebx /* Store in EBX the Int number */ |
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461 | popl %eax |
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462 | popl %ecx /* We must subtract it from ESP...*/ |
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463 | subl %ecx, %esp |
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464 | movw %ax, %ss |
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465 | |||
466 | /* Send EOI to master PIC */ |
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467 | movb $0x20,%al |
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468 | movl $0x20,%edx |
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469 | outb %al,%dx |
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470 | |||
471 | /* Resume the return value of _act_int */ |
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472 | /* & do the context switch if necessary! */ |
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473 | #ifdef __VIRCSW__ |
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474 | movw SYMBOL_NAME(currCtx), %ax |
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475 | cmpw JmpSel,%ax |
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476 | je NoPreempt4 |
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477 | movw %ax,JmpSel |
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478 | ljmp JmpZone |
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479 | #endif |
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480 | NoPreempt4: popl %gs |
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2 | pj | 481 | popl %fs |
482 | popl %es |
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483 | popl %ss |
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484 | popl %ds |
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485 | popal |
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486 | iret |
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40 | pj | 487 | |
488 | ll_handler_slave_pic: |
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489 | /* We do not know what is the DS value */ |
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490 | /* Then we save it & set it correctly */ |
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2 | pj | 491 | |
40 | pj | 492 | pushl %ds |
493 | pushl %ss |
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494 | pushl %es |
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495 | pushl %fs |
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496 | pushl %gs |
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497 | /* But we first transfer to the _act_int */ |
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498 | /* the interrupt number which is required */ |
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499 | /* as second argument */ |
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500 | pushl %eax |
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501 | movw $(X_FLATDATA_SEL),%ax |
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502 | movw %ax,%es |
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503 | mov %ax,%ds |
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504 | movw %ax, %fs |
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505 | movw %ax, %gs |
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506 | |||
507 | /* Now save the actual context on stack */ |
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508 | /* to pass it to _act_int (C caling convention) */ |
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509 | /* CLD is necessary when calling a C function */ |
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510 | |||
511 | cld |
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512 | |||
513 | /* The following could be optimized a little... */ |
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2 | pj | 514 | popl %eax |
40 | pj | 515 | xorl %ebx, %ebx |
2 | pj | 516 | movw %ss, %bx |
517 | /* We must switch to a ``safe stack'' */ |
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40 | pj | 518 | /* |
519 | * OK, this is the idea: in %esp we have the address of the |
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520 | * stack pointer in the APPLICATION address space... |
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521 | * We assume that address spaces are implemented through segments... |
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522 | * What we have to do is to add the segment base to %esp: |
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523 | * - Load the GDT base in a register |
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524 | * - Add DS * 8 to that value |
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525 | * - Read the corresponding GDT entry (the segment descriptor) |
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526 | * - Compute the base... |
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527 | * It is (*p & 0xFC) | (*(p +1) & 0x0F) << 16) | *(p + 2) |
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528 | */ |
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2 | pj | 529 | movl SYMBOL_NAME(GDT_base), %edi |
530 | addl %ebx, %edi |
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531 | xorl %ebx, %ebx |
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532 | movb 7(%edi), %bh |
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533 | movb 4(%edi), %bl |
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534 | shl $16, %ebx |
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535 | movw 2(%edi), %bx |
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536 | /* Is it correct? I think so... Test it!!! */ |
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537 | addl %ebx, %esp |
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538 | /* Save EBX for returning to our stack... */ |
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539 | movw %ss, %dx |
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40 | pj | 540 | movw %ds, %cx |
541 | movw %cx, %ss |
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2 | pj | 542 | pushl %ebx |
543 | pushl %edx |
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544 | pushl %eax |
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545 | |||
40 | pj | 546 | movl SYMBOL_NAME(ll_irq_table)(, %eax, 4), %ebx |
547 | call *%ebx |
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548 | |||
549 | popl %ebx /* Store in EBX the Int number */ |
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550 | popl %eax |
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551 | popl %ecx /* We must subtract it from ESP...*/ |
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552 | subl %ecx, %esp |
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553 | movw %ax, %ss |
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554 | |||
555 | /* Send EOI to master & slave PIC */ |
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556 | movb $0x20,%al |
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557 | movl $0xA0,%edx |
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558 | outb %al,%dx |
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559 | movl $0x20,%edx |
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560 | outb %al,%dx |
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561 | |||
562 | |||
563 | /* Resume the return value of _act_int */ |
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564 | /* & do the context switch if necessary! */ |
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565 | #ifdef __VIRCSW__ |
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566 | movw SYMBOL_NAME(currCtx), %ax |
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567 | cmpw JmpSel,%ax |
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568 | je NoPreempt5 |
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569 | movw %ax,JmpSel |
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570 | ljmp JmpZone |
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571 | #endif |
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572 | NoPreempt5: popl %gs |
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573 | popl %fs |
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574 | popl %es |
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575 | popl %ss |
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576 | popl %ds |
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577 | popal |
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2 | pj | 578 | iret |
40 | pj | 579 | |
580 | |||
581 | |||
582 | |||
583 | /* OK, this is Exception 7, and it is generated when an ESC or WAIT |
||
584 | * intruction is reached, and the MP and TS bits are set... Basically, |
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585 | * it means that the FPU context must be switched |
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586 | */ |
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587 | SYMBOL_NAME_LABEL(exc7) pushal |
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588 | pushl %ds |
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589 | pushl %ss |
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590 | pushl %es |
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591 | pushl %fs |
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592 | pushl %gs |
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593 | movw $(X_FLATDATA_SEL),%ax |
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594 | movw %ax,%es |
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595 | movw %ax,%ds |
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596 | cld |
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597 | call SYMBOL_NAME(ll_FPU_hook) |
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598 | popl %gs |
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599 | popl %fs |
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600 | popl %es |
||
601 | popl %ss |
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602 | popl %ds |
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603 | popal |
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604 | iret |