1 |
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2 | ; Disclaimer:
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3 | ;=============
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4 | ; The sourcecode is released via www.netlabs.org CVS *ONLY*.
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5 | ; You MUST NOT upload it to other servers nor republish it in any way.
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6 | ; The sourcecode is still COPYRIGHTED and NOT YET RELEASED UNDER GPL.
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7 | ; It's (c) Copyright 1998-2002 by Martin Kiewitz.
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8 | ; You may recompile the source and do *PRIVATE* modifications, but please keep
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9 | ; in mind that modifying this code needs at least *some* assembly skill. If
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10 | ; you mess up your system, because you needed to hack your way through, don't
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11 | ; blame me. Releasing a customized version of AiR-BOOT, selling it in any form
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12 | ; or reusing parts of this source is *PROHIBITED*. Ask me, if you have some
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13 | ; idea about new functionality *before* developing the code, otherwise I will
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14 | ; definitely reject it. Also please accept, that I have some basic design
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15 | ; rules on AiR-BOOT and I will maintain them at all costs, so this won't get
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16 | ; another GRUB.
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17 |
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18 | ;---------------------------------------------------------------------------
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19 | ; AiR-BOOT / DRIVE I/O
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20 | ;---------------------------------------------------------------------------
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21 |
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22 | ; Note: Some routines set DS/ES to CS, even if its not needed.
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23 | ; This was done for SECURITY. So DO NOT remove it. Its there to make
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24 | ; sure the correct data is loaded/written to/from harddrive.
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25 | ;
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26 | ; IF YOU MODIFY ANYTHING IN HERE, YOU CAN EASILY BREAK YOUR HARDDRIVE!
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27 |
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28 | ; Will only load base-configuration, will NOT load IPT nor Hide-Config
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29 | ; Those are originally loaded on startup and will NOT get reloaded.
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30 | DriveIO_LoadConfiguration Proc Near Uses ax bx cx dx es
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31 | mov ax, cs
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32 | mov es, ax
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33 | mov bx, offset Configuration
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34 | mov dx, 0080h ; First harddrive, Sector 55...
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35 | mov cx, 0037h
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36 | mov ax, 0201h ; Function 02, read 1 sector...
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37 | int 13h
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38 | jnc DIOLC_NoError
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39 | call MBR_LoadError ; Will Abort BootUp
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40 | DIOLC_NoError:
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41 | ret
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42 | DriveIO_LoadConfiguration EndP
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43 |
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44 | DriveIO_SaveConfiguration Proc Near Uses ax bx cx dx ds es si
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45 | mov ax, cs
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46 | mov ds, ax
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47 | mov es, ax ; Safety first (CS==DS==ES)
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48 | ; --- Overwrite Floppy-Name with "FloppyDrive"
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49 | mov si, offset TXT_Floppy_Drive
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50 | mov di, offset PartitionTable
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51 | sub di, 30 ; Adjust to Floppy-Name
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52 | mov cx, 11
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53 | rep movsb
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54 | mov si, offset Configuration ; Calculate new checksum
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55 | xor bx, bx
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56 | mov cx, 5 ; Total of 5 Config-Sectors
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57 | mov dx, [CFG_CheckConfig]
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58 | mov [CFG_CheckConfig], bx
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59 | DIOSC_Loop:
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60 | call MBR_GetCheckOfSector
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61 | loop DIOSC_Loop
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62 | mov [CFG_CheckConfig], bx
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63 | ; --------------------------------------------------------------------
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64 | ; ES == CS
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65 | mov bx, offset Configuration
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66 | mov dx, 0080h ; First harddrive, Sector 55...
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67 | mov cx, 0037h
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68 | mov ax, 0305h ; Function 03, 5 sectors to write
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69 | int 13h
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70 | jnc DIOSC_NoError
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71 | call MBR_SaveError ; Will Abort BootUp
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72 | DIOSC_NoError:
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73 | ret
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74 | DriveIO_SaveConfiguration EndP
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75 |
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76 | DriveIO_UpdateFloppyName Proc Near Uses bx cx dx ds si es di
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77 | mov ax, cs
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78 | mov ds, ax
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79 | mov es, ax
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80 |
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81 | mov ah, 00h ; Function 2 - Reset Drive
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82 | xor dl, dl
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83 | int 13h
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84 | xor dx, dx ; Cylinder=0, Head=0
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85 | mov cx, 1 ; Sector=1, Drive=0
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86 | mov bx, offset TmpSector ; ES:BX - TmpSector
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87 | mov ax, 0201h ; Function 2 - Load Sector
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88 | int 13h
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89 | jnc DIOUFN_AllFine
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90 |
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91 | ; --- Overwrite Floppy-Name with "No Disc"
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92 | mov si, offset TXT_Floppy_NoDisc
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93 | xor ax, ax
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94 | DIOUFN_WriteFloppyName:
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95 | mov di, offset PartitionTable
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96 | sub di, 30 ; Adjust to Floppy-Name
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97 | mov cl, 11
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98 | rep movsb
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99 | ret ; AX=-1 -> GotDisc, =0 -> NoDisc
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100 |
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101 | ; --- Floppy found and read, data in TempSector
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102 | DIOUFN_AllFine:
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103 | mov ax, -1
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104 | mov si, offset TXT_Floppy_NoName
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105 | cmp wptr es:[bx+54], 'AF'
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106 | jne DIOUFN_WriteFloppyName
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107 | cmp wptr es:[bx+56], '1T'
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108 | jne DIOUFN_WriteFloppyName
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109 | cmp bptr es:[bx+58], '2'
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110 | jne DIOUFN_WriteFloppyName
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111 | mov si, bx
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112 | add si, 43 ; FAT12 - Volume Label Location
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113 | jmp DIOUFN_WriteFloppyName
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114 | DriveIO_UpdateFloppyName EndP
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115 |
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116 | ; =============================================================================
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117 | ; HARDDRIVE / GENERAL ACCESS
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118 | ; =============================================================================
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119 | ; The following routines are used for harddisc/floppy access.
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120 | ; The access is done via BIOS INT 13h or BIOS/Extensions.
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121 | ; Access will be done prefered by INT 13h, because it's (I wonder!) much
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122 | ; faster, than the LBA-method. I don't know, why LBA is so slow. Perhaps BIOS.
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123 | ;
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124 | ; Internal access (to AiR-BOOT) is always done via INT 13h.
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125 |
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126 | Comment *ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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127 | Routine: Loads partition to ExecBase and checks for validity
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128 | ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
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129 | Calling : bx:ax - Absolute sector
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130 | cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
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131 | Returns : Carry Set if invalid partition encountered
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132 | Preserve: all registers
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133 | ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ*
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134 | DriveIO_LoadPartition Proc Near Uses ds si
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135 | mov wptr cs:[CurPartition_Location+0], ax
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136 | mov wptr cs:[CurPartition_Location+2], bx
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137 | mov wptr cs:[CurPartition_Location+4], dx
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138 | mov wptr cs:[CurPartition_Location+6], cx ; Saves the location
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139 | push ExecBaseSeg
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140 | pop ds
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141 | mov si, ExecBasePtr ; DS:SI - ExecBase
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142 | call DriveIO_LoadSector
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143 | clc
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144 | cmp word ptr ds:[si+LocBR_Magic], 0AA55h
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145 | je DIOLP_Success
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146 | stc
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147 | DIOLP_Success:
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148 | ret
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149 | DriveIO_LoadPartition EndP
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150 |
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151 | Comment *ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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152 | Routine: Writes a partition from ExecBase to its original sector
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153 | ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
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154 | Calling : none
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155 | Returns : none
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156 | Preserve: all registers
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157 | ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ*
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158 | DriveIO_SavePartition Proc Near Uses ax bx cx dx ds si
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159 | mov ax, wptr cs:[CurPartition_Location+0]
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160 | mov bx, wptr cs:[CurPartition_Location+2]
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161 | mov dx, wptr cs:[CurPartition_Location+4]
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162 | mov cx, wptr cs:[CurPartition_Location+6] ; Gets prev. saved location
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163 | push ExecBaseSeg
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164 | pop ds
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165 | mov si, ExecBasePtr ; DS:SI - ExecBase
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166 | call DriveIO_SaveSector
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167 | ret
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168 | DriveIO_SavePartition EndP
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169 |
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170 | ; Lsst DS:SI fr Aufrufer
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171 | DriveIO_LoadTmpSector Proc Near Uses
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172 | push cs
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173 | pop ds
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174 | mov si, offset TmpSector
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175 | call DriveIO_LoadSector
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176 | ret
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177 | DriveIO_LoadTmpSector EndP
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178 |
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179 | ; Lsst DS:SI fr Aufrufer
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180 | DriveIO_SaveTmpSector Proc Near Uses
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181 | push cs
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182 | pop ds
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183 | mov si, offset TmpSector
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184 | call DriveIO_SaveSector
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185 | ret
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186 | DriveIO_SaveTmpSector EndP
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187 |
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188 | ; Memory-Block that holds information for LBA-access via INT 13h
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189 | DriveIO_DAP: db 10h ; Size of paket
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190 | db 0 ; Reserved
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191 | DriveIO_DAP_NumBlocks dw 0 ; Number of blocks
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192 | DriveIO_DAP_Transfer dd 0 ; Transfer Adress
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193 | DriveIO_DAP_Absolute dd 0 ; Absolute Sector
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194 | dd 0 ; Second Part of QWORD
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195 |
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196 | Comment *ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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197 | Routine: Loads a specified sector to DS:DI
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198 | ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
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199 | Calling : bx:ax - Absolute sector
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200 | cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
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201 | ds:si - Destination-Adress
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202 | Returns : none
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203 | Preserve: all registers
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204 | ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ*
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205 | DriveIO_LoadSector Proc Near Uses ax bx ds si es di
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206 | ; LBA-boundary >16450560 (FB0400h)
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207 | cmp bx, 00FBh
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208 | jb DIOLS_UseNormal
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209 | test cs:[CurIO_UseExtension], 1
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210 | jnz DIOLS_UseExtension
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211 | DIOLS_UseNormal:
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212 | mov di, 3
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213 | DIOLS_ErrorLoop:
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214 | push ds
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215 | pop es
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216 | mov bx, si ; ES:BX - Destination
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217 | mov ax, 0201h ; Function 2 - Load Sector
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218 | int 13h
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219 | jnc DIOLS_Success
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220 | dec di
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221 | jnz DIOLS_ErrorLoop
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222 | call MBR_LoadError
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223 |
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224 | DIOLS_UseExtension:
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225 | push cx
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226 | mov cs:[DriveIO_DAP_NumBlocks], 1 ; Copy ONE sector
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227 | mov wptr cs:[DriveIO_DAP_Transfer+0], si
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228 | mov cx, ds
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229 | mov wptr cs:[DriveIO_DAP_Transfer+2], cx ; Fill out Transfer Adress
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230 | mov wptr cs:[DriveIO_DAP_Absolute+0], ax
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231 | mov wptr cs:[DriveIO_DAP_Absolute+2], bx ; Fill out Absolute Sector
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232 | push cs
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233 | pop ds
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234 | mov si, offset DriveIO_DAP
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235 | mov ah, 42h ; Extended Read
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236 | int 13h
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237 | pop cx
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238 | jnc DIOLS_Success
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239 | call MBR_LoadError
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240 |
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241 | DIOLS_Success:
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242 | ret
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243 | DriveIO_LoadSector EndP
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244 |
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245 | Comment *ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
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246 | Routine: Writes DS:SI to a specified sector
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247 | ÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍÍ
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248 | Calling : bx:ax - Absolute sector
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249 | cx:dx - Cylinder/Sector, Side/Drive (hi/lo-byte)
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250 | ds:si - Source-Adress
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251 | Returns : none
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252 | Preserve: all registers
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253 | ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ*
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254 | DriveIO_SaveSector Proc Near Uses ax bx cx ds si es di
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255 | ; LBA-boundary >16450560 (FB0400h)
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256 | cmp bx, 00FBh
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257 | jb DIOSS_UseNormal
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258 | test cs:[CurIO_UseExtension], 1
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259 | jnz DIOSS_UseExtension
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260 | DIOSS_UseNormal:
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261 | mov di, 3
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262 | DIOSS_ErrorLoop:
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263 | push ds
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264 | pop es
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265 | mov bx, si ; ES:BX - Destination
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266 | mov ax, 0301h ; Function 3 - Write Sector
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267 | int 13h
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268 | jnc DIOSS_Success
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269 | dec di
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270 | jnz DIOSS_ErrorLoop
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271 | call MBR_SaveError
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272 |
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273 | DIOSS_UseExtension:
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274 | push cx
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275 | mov cs:[DriveIO_DAP_NumBlocks], 1 ; Copy ONE sector
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276 | mov wptr cs:[DriveIO_DAP_Transfer+0], si
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277 | mov cx, ds
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278 | mov wptr cs:[DriveIO_DAP_Transfer+2], cx ; Fill out Transfer Adress
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279 | mov wptr cs:[DriveIO_DAP_Absolute+0], ax
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280 | mov wptr cs:[DriveIO_DAP_Absolute+2], bx ; Fill out Absolute Sector
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281 | push cs
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282 | pop ds
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283 | mov si, offset DriveIO_DAP
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284 | mov ax, 4300h ; Extended Write (No Verify)
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285 | int 13h
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286 | pop cx
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287 | jnc DIOSS_Success
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288 | call MBR_SaveError
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289 |
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290 | DIOSS_Success:
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291 | ret
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292 | DriveIO_SaveSector EndP
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