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 | ; Section containing code
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5 | SECTION .text
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6 |
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7 | ;--------------------------------------------------------------------
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8 | ; Int 13h software interrupt handler.
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9 | ; Jumps to specific function defined in AH.
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10 | ;
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11 | ; Note to developers: Do not make recursive INT 13h calls!
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12 | ;
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13 | ; Int13h_DiskFunctionsHandler
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14 | ; Parameters:
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15 | ; AH: Bios function
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16 | ; DL: Drive number
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17 | ; Other: Depends on function
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18 | ; Returns:
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19 | ; Depends on function
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20 | ;--------------------------------------------------------------------
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21 | ALIGN JUMP_ALIGN
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22 | Int13h_DiskFunctionsHandler:
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23 | sti ; Enable interrupts
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24 | cld ; String instructions to increment pointers
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25 | CREATE_FRAME_INTPACK_TO_SSBP EXTRA_BYTES_FOR_INTPACK
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26 |
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27 | call RamVars_GetSegmentToDS
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28 | call DriveXlate_ToOrBack
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29 | mov [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv], dl
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30 | call RamVars_IsFunctionHandledByThisBIOS
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31 | jc SHORT Int13h_DirectCallToAnotherBios
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32 |
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33 | call FindDPT_ForDriveNumber ; DS:DI now points to DPT
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34 |
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35 | ; Jump to correct BIOS function
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36 | eMOVZX bx, ah
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37 | shl bx, 1
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38 | cmp ah, 25h ; Possible EBIOS function?
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39 | %ifdef MODULE_EBIOS
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40 | ja SHORT .JumpToEbiosFunction
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41 | %else
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42 | ja SHORT Int13h_UnsupportedFunction
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43 | %endif
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44 | jmp [cs:bx+g_rgw13hFuncJump] ; Jump to BIOS function
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45 |
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46 | %ifdef MODULE_EBIOS
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47 | ; Jump to correct EBIOS function
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48 | ALIGN JUMP_ALIGN
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49 | .JumpToEbiosFunction:
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50 | test BYTE [di+DPT.bFlagsLow], FLG_DRVNHEAD_LBA
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51 | jz SHORT Int13h_UnsupportedFunction ; No eINT 13h for CHS drives
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52 | cmp ah, 48h
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53 | ja SHORT Int13h_UnsupportedFunction
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54 | sub bl, 41h<<1 ; BX = Offset to eINT 13h jump table
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55 | jb SHORT Int13h_UnsupportedFunction
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56 | jmp [cs:bx+g_rgwEbiosFunctionJumpTable]
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57 | %endif
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58 |
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59 | ;--------------------------------------------------------------------
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60 | ; Int13h_UnsupportedFunction
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61 | ; Int13h_DirectCallToAnotherBios
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62 | ; Parameters:
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63 | ; DL: Translated drive number
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64 | ; DS: RAMVARS segment
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65 | ; SS:BP: Ptr to IDEPACK
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66 | ; BX, DI: Corrupted on Int13h_DiskFunctionsHandler
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67 | ; Other: Function specific INT 13h parameters
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68 | ; Returns:
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69 | ; Depends on function
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70 | ; Corrupts registers:
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71 | ; Flags
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72 | ;--------------------------------------------------------------------
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73 | ALIGN JUMP_ALIGN
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74 | Int13h_UnsupportedFunction:
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75 | Int13h_DirectCallToAnotherBios:
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76 | call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
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77 | mov bx, [bp+IDEPACK.intpack+INTPACK.bx]
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78 | mov di, [bp+IDEPACK.intpack+INTPACK.di]
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79 | mov ds, [bp+IDEPACK.intpack+INTPACK.ds]
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80 | push WORD [bp+IDEPACK.intpack+INTPACK.flags]
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81 | popf
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82 | push bp
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83 | mov bp, [bp+IDEPACK.intpack+INTPACK.bp]
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84 | int BIOS_DISK_INTERRUPT_13h ; Can safely do as much recursion as it wants
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85 |
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86 | ; Store returned values to INTPACK
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87 | pop bp ; Standard INT 13h functions never uses BP as return register
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88 | %ifdef USE_386
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89 | mov [bp+IDEPACK.intpack+INTPACK.gs], gs
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90 | mov [bp+IDEPACK.intpack+INTPACK.fs], fs
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91 | %endif
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92 | mov [bp+IDEPACK.intpack+INTPACK.es], es
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93 | mov [bp+IDEPACK.intpack+INTPACK.ds], ds
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94 | mov [bp+IDEPACK.intpack+INTPACK.di], di
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95 | mov [bp+IDEPACK.intpack+INTPACK.si], si
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96 | mov [bp+IDEPACK.intpack+INTPACK.bx], bx
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97 | mov [bp+IDEPACK.intpack+INTPACK.dh], dh
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98 | mov [bp+IDEPACK.intpack+INTPACK.cx], cx
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99 | mov [bp+IDEPACK.intpack+INTPACK.ax], ax
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100 | pushf
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101 | pop WORD [bp+IDEPACK.intpack+INTPACK.flags]
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102 | call RamVars_GetSegmentToDS
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103 | cmp dl, [RAMVARS.xlateVars+XLATEVARS.bXlatedDrv]
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104 | je SHORT .ExchangeInt13hHandlers
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105 | mov [bp+IDEPACK.intpack+INTPACK.dl], dl ; Something is returned in DL
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106 | ALIGN JUMP_ALIGN
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107 | .ExchangeInt13hHandlers:
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108 | %ifdef USE_186
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109 | push Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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110 | jmp SHORT ExchangeCurrentInt13hHandlerWithOldInt13hHandler
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111 | %else
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112 | call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
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113 | jmp SHORT Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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114 | %endif
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115 |
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116 |
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117 | ;--------------------------------------------------------------------
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118 | ; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL
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119 | ; Parameters:
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120 | ; AH: BIOS Error code
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121 | ; CL: Number of sectors actually transferred
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122 | ; SS:BP: Ptr to IDEPACK
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123 | ; Returns:
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124 | ; All registers are loaded from INTPACK
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125 | ;--------------------------------------------------------------------
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126 | ALIGN JUMP_ALIGN
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127 | Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAHandTransferredSectorsFromCL:
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128 | mov [bp+IDEPACK.intpack+INTPACK.al], cl
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129 | ; Fall to Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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130 |
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131 | ;--------------------------------------------------------------------
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132 | ; Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH
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133 | ; Int13h_ReturnFromHandlerWithoutStoringErrorCode
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134 | ; Parameters:
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135 | ; AH: BIOS Error code
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136 | ; SS:BP: Ptr to IDEPACK
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137 | ; Returns:
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138 | ; All registers are loaded from INTPACK
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139 | ;--------------------------------------------------------------------
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140 | ALIGN JUMP_ALIGN
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141 | Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH:
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142 | %ifdef MODULE_SERIAL_FLOPPY
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143 | mov al, [bp+IDEPACK.intpack+INTPACK.dl]
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144 | Int13h_ReturnFromHandlerAfterStoringErrorCodeFromAH_ALHasDriveNumber:
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145 | call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber
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146 | %else
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147 | call Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
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148 | %endif
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149 | Int13h_ReturnFromHandlerWithoutStoringErrorCode:
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150 | or WORD [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_IF ; Return with interrupts enabled
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151 | mov sp, bp ; Now we can exit anytime
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152 | RESTORE_FRAME_INTPACK_FROM_SSBP EXTRA_BYTES_FOR_INTPACK
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153 |
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154 |
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155 | ;--------------------------------------------------------------------
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156 | ; Int13h_CallPreviousInt13hHandler
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157 | ; Parameters:
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158 | ; AH: INT 13h function to call
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159 | ; DL: Drive number
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160 | ; DS: RAMVARS segment
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161 | ; Returns:
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162 | ; Depends on function
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163 | ; NOTE: ES:DI needs to be returned from the previous interrupt
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164 | ; handler, for floppy DPT in function 08h
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165 | ; Corrupts registers:
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166 | ; None
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167 | ;--------------------------------------------------------------------
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168 | ALIGN JUMP_ALIGN
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169 | Int13h_CallPreviousInt13hHandler:
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170 | call ExchangeCurrentInt13hHandlerWithOldInt13hHandler
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171 | int BIOS_DISK_INTERRUPT_13h
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172 | ;;; fall-through to ExchangeCurrentInt13hHandlerWithOldInt13hHandler
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173 |
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174 | ;--------------------------------------------------------------------
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175 | ; ExchangeCurrentInt13hHandlerWithOldInt13hHandler
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176 | ; Parameters:
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177 | ; DS: RAMVARS segment
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178 | ; Returns:
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179 | ; Nothing
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180 | ; Corrupts registers:
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181 | ; Nothing
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182 | ; Note: Flags are preserved
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183 | ;--------------------------------------------------------------------
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184 | ALIGN JUMP_ALIGN
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185 | ExchangeCurrentInt13hHandlerWithOldInt13hHandler:
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186 | push es
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187 | push si
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188 | LOAD_BDA_SEGMENT_PRESERVE_FLAGS_TO es, si
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189 | mov si, [RAMVARS.fpOldI13h]
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190 | cli
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191 | xchg si, [es:BIOS_DISK_INTERRUPT_13h*4]
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192 | mov [RAMVARS.fpOldI13h], si
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193 | mov si, [RAMVARS.fpOldI13h+2]
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194 | xchg si, [es:BIOS_DISK_INTERRUPT_13h*4+2]
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195 | sti
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196 | mov [RAMVARS.fpOldI13h+2], si
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197 | pop si
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198 | pop es
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199 | ret
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200 |
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201 |
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202 | ;--------------------------------------------------------------------
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203 | ; Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH
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204 | ; Int13h_SetErrorCodeToIntpackInSSBPfromAH
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205 | ; Parameters:
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206 | ; AH: BIOS error code (00h = no error)
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207 | ; SS:BP: Ptr to IDEPACK
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208 | ; Returns:
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209 | ; SS:BP: Ptr to IDEPACK with error condition set
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210 | ; Corrupts registers:
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211 | ; DS, DI
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212 | ;--------------------------------------------------------------------
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213 | ALIGN JUMP_ALIGN
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214 | %ifdef MODULE_SERIAL_FLOPPY
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215 | Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH_ALHasDriveNumber:
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216 | ; Store error code to BDA
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217 | mov bx, BDA.bHDLastSt
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218 | test al, al
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219 | js .HardDisk
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220 | mov bl, BDA.bFDRetST & 0xff
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221 | .HardDisk:
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222 | LOAD_BDA_SEGMENT_TO ds, di
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223 | mov [bx], ah
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224 | %else
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225 | Int13h_SetErrorCodeToBdaAndToIntpackInSSBPfromAH:
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226 | ; Store error code to BDA
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227 | LOAD_BDA_SEGMENT_TO ds, di
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228 | mov [BDA.bHDLastSt], ah
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229 | %endif
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230 |
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231 | ; Store error code to INTPACK
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232 | Int13h_SetErrorCodeToIntpackInSSBPfromAH:
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233 | mov [bp+IDEPACK.intpack+INTPACK.ah], ah
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234 | test ah, ah
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235 | jnz SHORT .SetCFtoIntpack
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236 | and BYTE [bp+IDEPACK.intpack+INTPACK.flags], ~FLG_FLAGS_CF
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237 | ret
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238 | .SetCFtoIntpack:
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239 | or BYTE [bp+IDEPACK.intpack+INTPACK.flags], FLG_FLAGS_CF
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240 | ret
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241 |
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242 |
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243 | ; Jump table for correct BIOS function
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244 | ALIGN WORD_ALIGN
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245 | g_rgw13hFuncJump:
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246 | dw AH0h_HandlerForDiskControllerReset ; 00h, Disk Controller Reset (All)
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247 | dw AH1h_HandlerForReadDiskStatus ; 01h, Read Disk Status (All)
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248 | dw AH2h_HandlerForReadDiskSectors ; 02h, Read Disk Sectors (All)
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249 | dw AH3h_HandlerForWriteDiskSectors ; 03h, Write Disk Sectors (All)
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250 | dw AH4h_HandlerForVerifyDiskSectors ; 04h, Verify Disk Sectors (All)
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251 | dw Int13h_UnsupportedFunction ; 05h, Format Disk Track (XT, AT, EISA)
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252 | dw Int13h_UnsupportedFunction ; 06h, Format Disk Track with Bad Sectors (XT)
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253 | dw Int13h_UnsupportedFunction ; 07h, Format Multiple Cylinders (XT)
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254 | dw AH8h_HandlerForReadDiskDriveParameters ; 08h, Read Disk Drive Parameters (All)
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255 | dw AH9h_HandlerForInitializeDriveParameters ; 09h, Initialize Drive Parameters (All)
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256 | dw Int13h_UnsupportedFunction ; 0Ah, Read Disk Sectors with ECC (XT, AT, EISA)
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257 | dw Int13h_UnsupportedFunction ; 0Bh, Write Disk Sectors with ECC (XT, AT, EISA)
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258 | dw AHCh_HandlerForSeek ; 0Ch, Seek (All)
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259 | dw AHDh_HandlerForResetHardDisk ; 0Dh, Alternate Disk Reset (All)
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260 | dw Int13h_UnsupportedFunction ; 0Eh, Read Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
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261 | dw Int13h_UnsupportedFunction ; 0Fh, Write Sector Buffer (XT, PS/1), ESDI Undocumented Diagnostic (PS/2)
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262 | dw AH10h_HandlerForCheckDriveReady ; 10h, Check Drive Ready (All)
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263 | dw AH11h_HandlerForRecalibrate ; 11h, Recalibrate (All)
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264 | dw Int13h_UnsupportedFunction ; 12h, Controller RAM Diagnostic (XT)
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265 | dw Int13h_UnsupportedFunction ; 13h, Drive Diagnostic (XT)
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266 | dw Int13h_UnsupportedFunction ; 14h, Controller Internal Diagnostic (All)
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267 | dw AH15h_HandlerForReadDiskDriveSize ; 15h, Read Disk Drive Size (AT+)
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268 | dw Int13h_UnsupportedFunction ; 16h,
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269 | dw Int13h_UnsupportedFunction ; 17h,
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270 | dw Int13h_UnsupportedFunction ; 18h,
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271 | dw Int13h_UnsupportedFunction ; 19h, Park Heads (PS/2)
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272 | dw Int13h_UnsupportedFunction ; 1Ah, Format ESDI Drive (PS/2)
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273 | dw Int13h_UnsupportedFunction ; 1Bh, Get ESDI Manufacturing Header (PS/2)
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274 | dw Int13h_UnsupportedFunction ; 1Ch, ESDI Special Functions (PS/2)
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275 | dw Int13h_UnsupportedFunction ; 1Dh,
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276 | dw Int13h_UnsupportedFunction ; 1Eh,
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277 | dw Int13h_UnsupportedFunction ; 1Fh,
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278 | dw Int13h_UnsupportedFunction ; 20h,
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279 | dw Int13h_UnsupportedFunction ; 21h, Read Disk Sectors, Multiple Blocks (PS/1)
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280 | dw Int13h_UnsupportedFunction ; 22h, Write Disk Sectors, Multiple Blocks (PS/1)
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281 | dw AH23h_HandlerForSetControllerFeatures ; 23h, Set Controller Features Register (PS/1)
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282 | dw AH24h_HandlerForSetMultipleBlocks ; 24h, Set Multiple Blocks (PS/1)
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283 | dw AH25h_HandlerForGetDriveInformation ; 25h, Get Drive Information (PS/1)
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284 |
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285 | %ifdef MODULE_EBIOS
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286 | g_rgwEbiosFunctionJumpTable:
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287 | dw AH41h_HandlerForCheckIfExtensionsPresent ; 41h, Check if Extensions Present (EBIOS)*
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288 | dw AH42h_HandlerForExtendedReadSectors ; 42h, Extended Read Sectors (EBIOS)*
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289 | dw AH43h_HandlerForExtendedWriteSectors ; 43h, Extended Write Sectors (EBIOS)*
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290 | dw AH44h_HandlerForExtendedVerifySectors ; 44h, Extended Verify Sectors (EBIOS)*
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291 | dw Int13h_UnsupportedFunction ; 45h, Lock and Unlock Drive (EBIOS)***
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292 | dw Int13h_UnsupportedFunction ; 46h, Eject Media Request (EBIOS)***
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293 | dw AH47h_HandlerForExtendedSeek ; 47h, Extended Seek (EBIOS)*
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294 | dw AH48h_HandlerForGetExtendedDriveParameters ; 48h, Get Extended Drive Parameters (EBIOS)*
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295 | ; dw Int13h_UnsupportedFunction ; 49h, Get Extended Disk Change Status (EBIOS)***
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296 | ; dw Int13h_UnsupportedFunction ; 4Ah, Initiate Disk Emulation (Bootable CD-ROM)
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297 | ; dw Int13h_UnsupportedFunction ; 4Bh, Terminate Disk Emulation (Bootable CD-ROM)
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298 | ; dw Int13h_UnsupportedFunction ; 4Ch, Initiate Disk Emulation and Boot (Bootable CD-ROM)
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299 | ; dw Int13h_UnsupportedFunction ; 4Dh, Return Boot Catalog (Bootable CD-ROM)
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300 | ; dw Int13h_UnsupportedFunction ; 4Eh, Set Hardware Configuration (EBIOS)**
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301 | ;
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302 | ; * = Enhanced Drive Access Support (minimum required EBIOS functions)
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303 | ; ** = Enhanced Disk Drive (EDD) Support
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304 | ; *** = Drive Locking and Ejecting Support
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305 | %endif
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