1 | ; Project name : XTIDE Universal BIOS |
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2 | ; Description : Int 13h BIOS functions (Floppy and Hard disk). |
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3 | |
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4 | ; |
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5 | ; XTIDE Universal BIOS and Associated Tools |
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6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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7 | ; |
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8 | ; This program is free software; you can redistribute it and/or modify |
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9 | ; it under the terms of the GNU General Public License as published by |
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10 | ; the Free Software Foundation; either version 2 of the License, or |
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11 | ; (at your option) any later version. |
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12 | ; |
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13 | ; This program is distributed in the hope that it will be useful, |
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14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | ; GNU General Public License for more details. |
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17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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18 | ; |
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19 | |
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20 | ; Section containing code |
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21 | SECTION .text |
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22 | |
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23 | ;-------------------------------------------------------------------- |
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24 | ; Int 13h software interrupt handler. |
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25 | ; This handler changes stack to top of stolen conventional memory |
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26 | ; and then calls the actual INT 13h handler (Int13h_DiskFunctionsHandler). |
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27 | ; |
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28 | ; Int13h_DiskFunctionsHandlerWithStackChange |
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29 | ; Parameters: |
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30 | ; AH: Bios function |
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31 | ; DL: Drive number |
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32 | ; Other: Depends on function |
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33 | ; Returns: |
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34 | ; Depends on function |
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35 | ;-------------------------------------------------------------------- |
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36 | %ifdef RELOCATE_INT13H_STACK |
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37 | ALIGN JUMP_ALIGN |
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38 | Int13h_DiskFunctionsHandlerWithStackChange: |
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39 | push ds |
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40 | push di |
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41 | call RamVars_GetSegmentToDS |
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42 | |
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43 | ; Store entry registers to RAMVARS |
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44 | mov [RAMVARS.fpInt13hEntryStack], sp |
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45 | mov [RAMVARS.fpInt13hEntryStack+2], ss |
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46 | pop WORD [RAMVARS.wStackChangeDI] |
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47 | pop WORD [RAMVARS.wStackChangeDS] |
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48 | |
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49 | ; Load new stack and restore DS and DI |
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50 | mov di, ds ; We do not want to overwrite DS and DI in stack |
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51 | mov ss, di |
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52 | mov sp, [RAMVARS.wNewStackOffset] |
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53 | lds di, [RAMVARS.dwStackChangeDSDI] |
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54 | |
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55 | ; Call INT 13h |
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56 | pushf |
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57 | push cs |
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58 | call Int13h_DiskFunctionsHandler |
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59 | |
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60 | ; Restore stack (we must not corrupt FLAGS!) |
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61 | cli |
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62 | %ifdef USE_386 |
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63 | lss sp, [ss:RAMVARS.fpInt13hEntryStack] |
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64 | %else |
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65 | mov sp, [ss:RAMVARS.fpInt13hEntryStack] |
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66 | mov ss, [ss:RAMVARS.fpInt13hEntryStack+2] |
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67 | %endif |
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68 | pop di ; DI before stack change |
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69 | pop ds ; DS before stack change |
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70 | retf 2 ; Skip FLAGS from stack |
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71 | %endif ; RELOCATE_INT13H_STACK |
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72 | |
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73 | |
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74 | ;-------------------------------------------------------------------- |
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75 | ; Int 13h software interrupt handler. |
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76 | ; Jumps to specific function defined in AH. |
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77 | ; |
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78 | ; Note to developers: Do not make recursive INT 13h calls! |
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79 | ; |
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80 | ; Int13h_DiskFunctionsHandler |
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81 | ; Parameters: |
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82 | ; AH: Bios function |
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83 | ; DL: Drive number |
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84 | ; Other: Depends on function |
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85 | ; Returns: |
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86 | ; Depends on function |
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87 | ;-------------------------------------------------------------------- |
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88 | ALIGN JUMP_ALIGN |
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89 | Int13h_DiskFunctionsHandler: |
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90 | sti ; Enable interrupts |
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91 | cld ; String instructions to increment pointers |
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92 | CREATE_FRAME_INTPACK_TO_SSBP EXTRA_BYTES_FOR_INTPACK |
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93 | call RamVars_GetSegmentToDS |
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94 | |
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95 | %ifdef MODULE_HOTKEYS |
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96 | call DriveXlate_ToOrBack |
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97 | mov [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv], dl |
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98 | %endif |
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99 | call FindDPT_ForDriveNumberInDL ; DS:DI points to our DPT, or NULL if not our drive |
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100 | jc SHORT .NotOurDrive ; DPT not found so this is not one of our drives |
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101 | |
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102 | .OurFunction: |
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103 | ; Jump to correct BIOS function |
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104 | eMOVZX bx, ah |
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105 | shl bx, 1 |
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106 | cmp ah, 25h ; Possible EBIOS function? |
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107 | %ifndef MODULE_EBIOS |
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108 | ja SHORT UnsupportedFunction |
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109 | jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function |
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110 | |
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111 | %else ; If using MODULE_EBIOS |
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112 | ja SHORT .JumpToEbiosFunction |
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113 | jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function |
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114 | |
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115 | ALIGN JUMP_ALIGN |
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116 | .JumpToEbiosFunction: |
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117 | test BYTE [di+DPT.bFlagsLow], FLGL_DPT_LBA_AND_EBIOS_SUPPORTED |
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118 | jz SHORT UnsupportedFunction ; No eINT 13h for CHS drives |
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119 | sub bl, 41h<<1 ; BX = Offset to eINT 13h jump table |
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120 | jb SHORT UnsupportedFunction |
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121 | cmp ah, 48h |
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122 | ja SHORT UnsupportedFunction |
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123 | jmp [cs:bx+g_rgwEbiosFunctionJumpTable] |
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124 | %endif ; MODULE_EBIOS |
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125 | |
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126 | |
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127 | ALIGN JUMP_ALIGN |
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128 | .NotOurDrive: |
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129 | test ah, ah |
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130 | jz SHORT .OurFunction ; We handle all function 0h requests (resets) |
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131 | |
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132 | %ifndef MODULE_SERIAL_FLOPPY |
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133 | ; Without floppy support, we handle only hard disk traffic for function 08h. |
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134 | test dl, dl |
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135 | jns SHORT Int13h_DirectCallToAnotherBios |
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136 | %endif |
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137 | ; With floppy support, we handle all traffic for function 08h, as we need to wrap both hard disk and floppy drive counts. |
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138 | cmp ah, 8 |
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139 | je SHORT .OurFunction |
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140 | ; Fall to Int13h_DirectCallToAnotherBios |
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141 | |
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142 | |
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143 | ;-------------------------------------------------------------------- |
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144 | ; UnsupportedFunction |
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145 | ; Int13h_DirectCallToAnotherBios |
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146 | ; Parameters: |
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147 | ; DL: Translated drive number |
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148 | ; DS: RAMVARS segment |
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149 | ; SS:BP: Ptr to IDEPACK |
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150 | ; BX, DI: Corrupted on Int13h_DiskFunctionsHandler |
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151 | ; Other: Function specific INT 13h parameters |
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152 | ; Returns: |
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153 | ; Depends on function |
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154 | ; Corrupts registers: |
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155 | ; Flags |
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156 | ;-------------------------------------------------------------------- |
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157 | ALIGN JUMP_ALIGN |
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158 | UnsupportedFunction: |
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159 | Int13h_DirectCallToAnotherBios: |
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160 | call ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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161 | mov bx, [bp+IDEPACK.intpack+INTPACK.bx] |
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162 | mov di, [bp+IDEPACK.intpack+INTPACK.di] |
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163 | mov ds, [bp+IDEPACK.intpack+INTPACK.ds] |
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164 | push WORD [bp+IDEPACK.intpack+INTPACK.flags] |
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165 | popf |
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166 | push bp |
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167 | mov bp, [bp+IDEPACK.intpack+INTPACK.bp] |
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168 | int BIOS_DISK_INTERRUPT_13h ; Can safely do as much recursion as it wants |
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169 | |
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170 | ; Store returned values to INTPACK |
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171 | pop bp ; Standard INT 13h functions never uses BP as return register |
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172 | %ifdef USE_386 |
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173 | ; mov [bp+IDEPACK.intpack+INTPACK.gs], gs |
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174 | ; mov [bp+IDEPACK.intpack+INTPACK.fs], fs |
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175 | %endif |
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176 | mov [bp+IDEPACK.intpack+INTPACK.es], es |
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177 | mov [bp+IDEPACK.intpack+INTPACK.ds], ds |
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178 | mov [bp+IDEPACK.intpack+INTPACK.di], di |
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179 | mov [bp+IDEPACK.intpack+INTPACK.si], si |
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180 | mov [bp+IDEPACK.intpack+INTPACK.bx], bx |
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181 | %ifdef MODULE_HOTKEYS |
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182 | mov [bp+IDEPACK.intpack+INTPACK.dh], dh |
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183 | %else |
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184 | mov [bp+IDEPACK.intpack+INTPACK.dx], dx |
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185 | %endif |
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186 | mov [bp+IDEPACK.intpack+INTPACK.cx], cx |
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187 | mov [bp+IDEPACK.intpack+INTPACK.ax], ax |
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188 | pushf |
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189 | pop WORD [bp+IDEPACK.intpack+INTPACK.flags] |
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190 | call RamVars_GetSegmentToDS |
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191 | |
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192 | %ifdef MODULE_HOTKEYS |
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193 | cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv] ; DL is still drive number? |
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194 | je SHORT .ExchangeInt13hHandlers |
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195 | mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL |
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196 | ALIGN JUMP_ALIGN |
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197 | .ExchangeInt13hHandlers: |
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198 | %endif |
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199 | |
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200 | %ifdef USE_186 |
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201 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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202 | jmp SHORT ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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203 | %else |
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204 | call ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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205 | jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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206 | %endif |
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207 | |
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208 | |
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209 | %ifdef MODULE_SERIAL_FLOPPY |
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210 | ;-------------------------------------------------------------------- |
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211 | ; Int13h_ReturnSuccessForFloppy |
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212 | ; |
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213 | ; Some operations, such as format of a floppy disk track, should just |
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214 | ; return success, while for hard disks it should be treated as unsupported. |
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215 | ;-------------------------------------------------------------------- |
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216 | ALIGN JUMP_ALIGN |
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217 | Int13h_ReturnSuccessForFloppy: |
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218 | test dl, dl |
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219 | js SHORT UnsupportedFunction |
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220 | xor ah, ah |
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221 | jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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222 | %endif |
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223 | |
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224 | |
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225 | ;-------------------------------------------------------------------- |
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226 | ; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL |
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227 | ; Parameters: |
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228 | ; AH: BIOS Error code |
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229 | ; CL: Number of sectors actually transferred |
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230 | ; SS:BP: Ptr to IDEPACK |
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231 | ; Returns: |
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232 | ; All registers are loaded from INTPACK |
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233 | ;-------------------------------------------------------------------- |
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234 | ALIGN JUMP_ALIGN |
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235 | Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL: |
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236 | mov [bp+IDEPACK.intpack+INTPACK.al], cl |
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237 | ; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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238 | |
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239 | |
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240 | ;-------------------------------------------------------------------- |
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241 | ; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH |
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242 | ; Int13h_ReturnFromHandlerWithoutStoringErrorCode |
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243 | ; Parameters: |
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244 | ; AH: BIOS Error code |
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245 | ; DS: RAMVARS segment |
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246 | ; SS:BP: Ptr to IDEPACK |
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247 | ; Returns: |
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248 | ; All registers are loaded from INTPACK |
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249 | ;-------------------------------------------------------------------- |
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250 | ALIGN JUMP_ALIGN |
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251 | Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH: |
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252 | %ifdef MODULE_SERIAL_FLOPPY |
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253 | mov al, [bp+IDEPACK.intpack+INTPACK.dl] |
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254 | Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber: |
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255 | call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber |
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256 | |
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257 | %else |
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258 | call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH |
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259 | %endif |
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260 | |
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261 | Int13h_ReturnFromHandlerWithoutStoringErrorCode: |
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262 | ; Always return with interrupts enabled since there are programs that rely |
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263 | ; on INT 13h to enable interrupts. |
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264 | or BYTE [bp+IDEPACK.intpack+INTPACK.flags+1], (FLG_FLAGS_IF>>8) |
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265 | mov sp, bp ; This makes possible to exit anytime, no matter what is on stack |
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266 | RESTORE_FRAME_INTPACK_FROM_SSBP EXTRA_BYTES_FOR_INTPACK |
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267 | |
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268 | |
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269 | ;-------------------------------------------------------------------- |
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270 | ; Int13h_CallPreviousInt13hHandler |
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271 | ; Parameters: |
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272 | ; AH: INT 13h function to call |
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273 | ; DL: Drive number |
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274 | ; DS: RAMVARS segment |
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275 | ; Returns: |
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276 | ; Depends on function |
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277 | ; NOTE: ES:DI needs to be returned from the previous interrupt |
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278 | ; handler, for floppy DPT in function 08h |
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279 | ; Corrupts registers: |
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280 | ; None |
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281 | ;-------------------------------------------------------------------- |
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282 | ALIGN JUMP_ALIGN |
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283 | Int13h_CallPreviousInt13hHandler: |
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284 | call ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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285 | int BIOS_DISK_INTERRUPT_13h |
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286 | ;;; fall-through to ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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287 | |
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288 | ;-------------------------------------------------------------------- |
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289 | ; ExchangeCurrentInt13hHandlerWithOldInt13hHandler |
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290 | ; Parameters: |
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291 | ; DS: RAMVARS segment |
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292 | ; Returns: |
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293 | ; Nothing |
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294 | ; Corrupts registers: |
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295 | ; Nothing |
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296 | ; Note: Flags are preserved |
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297 | ;-------------------------------------------------------------------- |
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298 | ALIGN JUMP_ALIGN |
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299 | ExchangeCurrentInt13hHandlerWithOldInt13hHandler: |
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300 | push es |
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301 | push si |
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302 | LOAD_BDA_SEGMENT_PRESERVE_FLAGS_TO es, si |
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303 | mov si, [RAMVARS.fpOldI13h] |
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304 | cli |
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305 | xchg si, [es:BIOS_DISK_INTERRUPT_13h*4] |
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306 | mov [RAMVARS.fpOldI13h], si |
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307 | mov si, [RAMVARS.fpOldI13h+2] |
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308 | xchg si, [es:BIOS_DISK_INTERRUPT_13h*4+2] |
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309 | sti |
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310 | mov [RAMVARS.fpOldI13h+2], si |
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311 | pop si |
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312 | pop es |
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313 | ret |
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314 | |
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315 | |
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316 | ;-------------------------------------------------------------------- |
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317 | ; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH |
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318 | ; Int13h_SetErrorCodeToIntpackInSSBPfromAH |
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319 | ; Parameters: |
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320 | ; AH: BIOS error code (00h = no error) |
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321 | ; SS:BP: Ptr to IDEPACK |
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322 | ; Returns: |
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323 | ; SS:BP: Ptr to IDEPACK with error condition set |
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324 | ; Corrupts registers: |
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325 | ; DS, DI |
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326 | ;-------------------------------------------------------------------- |
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327 | ALIGN JUMP_ALIGN |
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328 | %ifdef MODULE_SERIAL_FLOPPY |
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329 | Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber: |
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330 | ; Store error code to BDA |
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331 | mov bx, BDA.bHDLastSt |
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332 | test al, al |
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333 | js SHORT .HardDisk |
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334 | mov bl, BDA.bFDRetST & 0xff |
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335 | .HardDisk: |
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336 | LOAD_BDA_SEGMENT_TO ds, di |
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337 | mov [bx], ah |
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338 | ; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH |
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339 | |
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340 | %else |
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341 | Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH: |
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342 | ; Store error code to BDA |
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343 | LOAD_BDA_SEGMENT_TO ds, di |
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344 | mov [BDA.bHDLastSt], ah |
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345 | ; Fall to Int13h_SetErrorCodeToIntpackInSSBPfromAH |
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346 | %endif |
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347 | |
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348 | ; Store error code to INTPACK |
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349 | Int13h_SetErrorCodeToIntpackInSSBPfromAH: |
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350 | mov [bp+IDEPACK.intpack+INTPACK.ah], ah |
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351 | test ah, ah |
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352 | jnz SHORT .SetCFtoIntpack |
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353 | and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF |
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354 | ret |
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355 | .SetCFtoIntpack: |
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356 | or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF |
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357 | ret |
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358 | |
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359 | |
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360 | ; Jump table for correct BIOS function |
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361 | ALIGN WORD_ALIGN |
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362 | g_rgw13hFuncJump: |
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363 | dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All) |
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364 | dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All) |
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365 | dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All) |
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366 | dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All) |
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367 | dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All) |
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368 | %ifdef MODULE_SERIAL_FLOPPY |
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369 | dw Int13h_ReturnSuccessForFloppy ; 05h, Format Disk Track (XT, AT, EISA) |
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370 | %else |
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371 | dw UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA) |
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372 | %endif |
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373 | dw UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT) |
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374 | dw UnsupportedFunction ; 07h, Format Multiple Cylinders (XT) |
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375 | dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All) |
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376 | dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All) |
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377 | dw UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA) |
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378 | dw UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA) |
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379 | dw AHCh_HandlerForSeek ; 0Ch, Seek (All) |
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380 | dw AHDh_HandlerForResetHardDisk ; 0Dh, Alternate Disk Reset (All) |
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381 | dw UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2) |
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382 | dw UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2) |
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383 | dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All) |
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384 | dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All) |
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385 | dw UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT) |
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386 | dw UnsupportedFunction ; 13h, Drive Diagnostic (XT) |
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387 | dw UnsupportedFunction ; 14h, Controller Internal Diagnostic (All) |
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388 | dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+) |
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389 | dw UnsupportedFunction ; 16h, |
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390 | dw UnsupportedFunction ; 17h, |
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391 | dw UnsupportedFunction ; 18h, |
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392 | dw UnsupportedFunction ; 19h, Park Heads (PS/2) |
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393 | dw UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2) |
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394 | dw UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2) |
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395 | dw UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2) |
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396 | dw UnsupportedFunction ; 1Dh, |
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397 | dw UnsupportedFunction ; 1Eh, |
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398 | dw UnsupportedFunction ; 1Fh, |
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399 | dw UnsupportedFunction ; 20h, |
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400 | dw UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1) |
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401 | dw UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1) |
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402 | dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1) |
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403 | dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1) |
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404 | dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1) |
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405 | |
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406 | %ifdef MODULE_EBIOS |
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407 | g_rgwEbiosFunctionJumpTable: |
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408 | dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)* |
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409 | dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)* |
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410 | dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)* |
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411 | dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)* |
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412 | dw UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)*** |
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413 | dw UnsupportedFunction ; 46h, Eject Media Request (EBIOS)*** |
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414 | dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)* |
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415 | dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)* |
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416 | ; dw UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)*** |
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417 | ; dw UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM) |
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418 | ; dw UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM) |
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419 | ; dw UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM) |
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420 | ; dw UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM) |
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421 | ; dw UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)** |
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422 | ; |
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423 | ; * = Enhanced Drive Access Support (minimum required EBIOS functions) |
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424 | ; ** = Enhanced Disk Drive (EDD) Support |
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425 | ; *** = Drive Locking and Ejecting Support |
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426 | %endif |
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