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Rev | Author | Line No. | Line |
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65 | mario79 | 1 | ;************************************************************* |
74 | mario79 | 2 | ;* 29.04.2006 Elimination of hangup after the * |
3 | ;* expiration hd_wait_timeout - Mario79 * |
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65 | mario79 | 4 | ;* 28.01.2006 find all Fat16/32 partition in all input point * |
5 | ;* to MBR - Mario79 * |
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6 | ;************************************************************* |
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7 | |||
8 | align 4 |
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9 | ;****************************************************** |
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10 | ; Please do not change this place - variables in text |
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11 | ; Mario79 |
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12 | ; START place |
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13 | ;****************************************************** |
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14 | PARTITION_START dd 0x3f |
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15 | PARTITION_END dd 0 |
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16 | SECTORS_PER_FAT dd 0x1f3a |
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17 | NUMBER_OF_FATS dd 0x2 |
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18 | SECTORS_PER_CLUSTER dd 0x8 |
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19 | BYTES_PER_SECTOR dd 0x200 ; Note: if BPS <> 512 need lots of changes |
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20 | ROOT_CLUSTER dd 2 ; first rootdir cluster |
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21 | FAT_START dd 0 ; start of fat table |
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22 | ROOT_START dd 0 ; start of rootdir (only fat16) |
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23 | ROOT_SECTORS dd 0 ; count of rootdir sectors (only fat16) |
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24 | DATA_START dd 0 ; start of data area (=first cluster 2) |
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25 | LAST_CLUSTER dd 0 ; last availabe cluster |
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26 | ADR_FSINFO dd 0 ; used only by fat32 |
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27 | |||
28 | fatRESERVED dd 0x0FFFFFF6 |
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29 | fatBAD dd 0x0FFFFFF7 |
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30 | fatEND dd 0x0FFFFFF8 |
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31 | fatMASK dd 0x0FFFFFFF |
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32 | |||
33 | fat_type db 0 ; 0=none, 16=fat16, 32=fat32 |
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34 | ;*************************************************************************** |
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35 | ; End place |
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36 | ; Mario79 |
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37 | ;*************************************************************************** |
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38 | |||
39 | iglobal |
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40 | partition_types: ; list of fat16/32 partitions |
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41 | db 0x04 ; DOS: fat16 <32M |
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42 | db 0x06 ; DOS: fat16 >32M |
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43 | db 0x0b ; WIN95: fat32 |
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44 | db 0x0c ; WIN95: fat32, LBA-mapped |
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45 | db 0x0e ; WIN95: fat16, LBA-mapped |
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46 | db 0x14 ; Hidden DOS: fat16 <32M |
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47 | db 0x16 ; Hidden DOS: fat16 >32M |
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48 | db 0x1b ; Hidden WIN95: fat32 |
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49 | db 0x1c ; Hidden WIN95: fat32, LBA-mapped |
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50 | db 0x1e ; Hidden WIN95: fat16, LBA-mapped |
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51 | db 0xc4 ; DRDOS/secured: fat16 <32M |
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52 | db 0xc6 ; DRDOS/secured: fat16 >32M |
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53 | db 0xcb ; DRDOS/secured: fat32 |
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54 | db 0xcc ; DRDOS/secured: fat32, LBA-mapped |
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55 | db 0xce ; DRDOS/secured: fat16, LBA-mapped |
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56 | db 0xd4 ; Old Multiuser DOS secured: fat16 <32M |
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57 | db 0xd6 ; Old Multiuser DOS secured: fat16 >32M |
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58 | partition_types_end: |
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59 | |||
60 | |||
61 | extended_types: ; list of extended partitions |
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62 | db 0x05 ; DOS: extended partition |
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63 | db 0x0f ; WIN95: extended partition, LBA-mapped |
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64 | db 0xc5 ; DRDOS/secured: extended partition |
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65 | db 0xd5 ; Old Multiuser DOS secured: extended partition |
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66 | extended_types_end: |
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67 | |||
68 | endg |
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69 | |||
70 | ; Partition chain used: |
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71 | ; MBR ; PARTITION2 ; PARTITION3 ; PARTITION4 |
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72 | ;========================================================== |
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73 | ; fat16/32 +-- fat16/32 +-- fat16/32 +-- fat16/32 +-- |
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74 | ; extended --+ extended --+ extended --+ extended --+ |
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75 | ; 0 0 0 0 |
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76 | ; 0 0 0 0 |
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77 | ; Notes: |
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78 | ; - extended partition need to be in second entry on table |
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79 | ; - it will skip over removed partitions |
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80 | |||
81 | set_FAT32_variables: |
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82 | mov [0xfe10],dword 0 ; entries in hd cache |
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83 | mov [problem_partition],0 |
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84 | call reserve_hd1 |
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85 | call clear_hd_cache |
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86 | |||
87 | cmp dword [hdpos],0 |
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88 | je problem_hd |
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89 | |||
90 | pushad |
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91 | xor ecx,ecx ; partition count |
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92 | mov edx,-1 ; flag for partition |
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93 | xor eax,eax ; read MBR |
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94 | xor ebp,ebp ; extended partition start |
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95 | |||
96 | new_partition: |
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97 | test ebp,ebp ; is there extended partition? |
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98 | jnz extended_already_set ; yes |
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99 | xchg ebp,eax ; no. set it now |
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100 | |||
101 | extended_already_set: |
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102 | add eax,ebp ; mbr=mbr+0, ext_part=ext_start+relat_start |
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103 | mov ebx,buffer |
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104 | call hd_read |
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74 | mario79 | 105 | cmp [hd_error],0 |
106 | jne problem_hd |
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65 | mario79 | 107 | |
108 | cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector? |
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109 | jnz end_partition_chain |
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110 | cmp dword [ebx+0x1be+0xc],0 ; skip over empty partition |
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111 | jz next_partition |
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112 | |||
113 | push eax |
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114 | mov al,[ebx+0x1be+4] ; get primary partition type |
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115 | call scan_partition_types |
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116 | pop eax |
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117 | jnz next_primary_partition ; no. skip over |
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118 | |||
119 | inc ecx |
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120 | cmp ecx,[fat32part] ; is it wanted partition? |
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121 | jnz next_primary_partition ; no |
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122 | |||
123 | mov edx,eax ; start sector |
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124 | add edx,[ebx+0x1be+8] ; add relative start |
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125 | |||
126 | next_primary_partition: |
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127 | push eax |
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128 | mov al,[ebx+0x1be+4+16] ; get primary partition type |
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129 | call scan_partition_types |
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130 | pop eax |
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131 | jnz next_primary_partition_1 ; no. skip over |
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132 | |||
133 | inc ecx |
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134 | cmp ecx,[fat32part] ; is it wanted partition? |
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135 | jnz next_primary_partition_1 ; no |
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136 | |||
137 | mov edx,eax ; start sector |
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138 | add edx,[ebx+0x1be+8+16] ; add relative start |
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139 | |||
140 | next_primary_partition_1: |
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141 | push eax |
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142 | mov al,[ebx+0x1be+4+16+16] ; get primary partition type |
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143 | call scan_partition_types |
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144 | pop eax |
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145 | jnz next_primary_partition_2 ; no. skip over |
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146 | |||
147 | inc ecx |
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148 | cmp ecx,[fat32part] ; is it wanted partition? |
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149 | jnz next_primary_partition_2 ; no |
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150 | |||
151 | mov edx,eax ; start sector |
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152 | add edx,[ebx+0x1be+8+16+16] ; add relative start |
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153 | |||
154 | next_primary_partition_2: |
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155 | push eax |
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156 | mov al,[ebx+0x1be+4+16+16+16] ; get primary partition type |
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157 | call scan_partition_types |
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158 | pop eax |
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159 | jnz next_partition ; no. skip over |
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160 | |||
161 | inc ecx |
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162 | cmp ecx,[fat32part] ; is it wanted partition? |
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163 | jnz next_partition ; no |
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164 | |||
165 | mov edx,eax ; start sector |
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166 | add edx,[ebx+0x1be+8+16+16+16] ; add relative start |
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167 | |||
168 | next_partition: |
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169 | push eax |
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170 | mov al,[ebx+0x1be+4] ; get extended partition type |
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171 | call scan_extended_types |
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172 | pop eax |
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173 | jnz next_partition_1 |
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174 | |||
175 | mov eax,[ebx+0x1be+8] ; add relative start |
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176 | test eax,eax ; is there extended partition? |
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177 | jnz new_partition ; yes. read it |
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178 | |||
179 | next_partition_1: |
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180 | push eax |
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181 | mov al,[ebx+0x1be+4+16] ; get extended partition type |
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182 | call scan_extended_types |
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183 | pop eax |
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184 | jnz next_partition_2 |
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185 | |||
186 | mov eax,[ebx+0x1be+8+16] ; add relative start |
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187 | test eax,eax ; is there extended partition? |
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188 | jnz new_partition ; yes. read it |
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189 | |||
190 | next_partition_2: |
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191 | push eax |
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192 | mov al,[ebx+0x1be+4+16+16] ; get extended partition type |
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193 | call scan_extended_types |
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194 | pop eax |
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195 | jnz next_partition_3 |
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196 | |||
197 | mov eax,[ebx+0x1be+8+16+16] ; add relative start |
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198 | test eax,eax ; is there extended partition? |
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199 | jnz new_partition ; yes. read it |
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200 | |||
201 | next_partition_3: |
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202 | push eax |
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203 | mov al,[ebx+0x1be+4+16+16+16] ; get extended partition type |
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204 | call scan_extended_types |
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205 | pop eax |
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206 | jnz end_partition_chain ; no. end chain |
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207 | |||
208 | mov eax,[ebx+0x1be+8+16+16+16] ; get start of extended partition |
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209 | test eax,eax ; is there extended partition? |
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210 | jnz new_partition ; yes. read it |
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211 | |||
212 | end_partition_chain: |
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213 | mov [partition_count],ecx |
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214 | |||
215 | cmp edx,-1 ; found wanted partition? |
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216 | jnz hd_and_partition_ok ; yes. install it |
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217 | jmp problem_partition_or_fat |
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218 | |||
219 | scan_partition_types: |
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220 | push ecx |
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221 | mov edi,partition_types |
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222 | mov ecx,partition_types_end-partition_types |
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223 | cld |
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224 | repne scasb ; is partition type ok? |
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225 | pop ecx |
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226 | ret |
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227 | |||
228 | scan_extended_types: |
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229 | push ecx |
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230 | mov edi,extended_types |
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231 | mov ecx,extended_types_end-extended_types |
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232 | cld |
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233 | repne scasb ; is it extended partition? |
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234 | pop ecx |
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235 | ret |
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236 | |||
237 | problem_fat_dec_count: ; bootsector is missing or another problem |
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238 | dec [partition_count] ; remove it from partition_count |
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239 | |||
240 | problem_partition_or_fat: |
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241 | popad |
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242 | |||
243 | problem_hd: |
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244 | mov [fat_type],0 |
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245 | mov [hd1_status],0 ; free |
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246 | mov [problem_partition],1 |
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247 | ret |
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248 | |||
249 | hd_and_partition_ok: |
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250 | mov eax,edx |
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251 | mov [PARTITION_START],eax |
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252 | |||
253 | mov [hd_setup],1 |
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254 | mov ebx,buffer |
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255 | call hd_read ; read boot sector of partition |
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74 | mario79 | 256 | cmp [hd_error],0 |
257 | jne problem_fat_dec_count |
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258 | |||
65 | mario79 | 259 | mov [hd_setup],0 |
260 | |||
261 | cmp word [ebx+0x1fe],0xaa55 ; is it valid boot sector? |
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262 | jnz problem_fat_dec_count |
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263 | |||
264 | movzx eax,word [ebx+0xe] ; sectors reserved |
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265 | add eax,[PARTITION_START] |
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266 | mov [FAT_START],eax ; fat_start = partition_start + reserved |
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267 | |||
268 | movzx eax,byte [ebx+0xd] ; sectors per cluster |
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269 | mov [SECTORS_PER_CLUSTER],eax |
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270 | |||
271 | movzx ecx,word [ebx+0xb] ; bytes per sector |
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272 | mov [BYTES_PER_SECTOR],ecx |
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273 | |||
274 | movzx eax,word [ebx+0x11] ; count of rootdir entries (=0 fat32) |
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275 | mov edx,32 |
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276 | mul edx |
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277 | dec ecx |
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278 | add eax,ecx ; round up if not equal count |
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279 | inc ecx ; bytes per sector |
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280 | div ecx |
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281 | mov [ROOT_SECTORS],eax ; count of rootdir sectors |
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282 | |||
283 | movzx eax,word [ebx+0x16] ; sectors per fat <65536 |
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284 | test eax,eax |
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285 | jnz fat16_fatsize |
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286 | mov eax,[ebx+0x24] ; sectors per fat |
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287 | fat16_fatsize: |
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288 | mov [SECTORS_PER_FAT],eax |
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289 | |||
290 | movzx eax,byte [ebx+0x10] ; number of fats |
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291 | test eax,eax ; if 0 it's not fat partition |
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292 | jz problem_fat_dec_count |
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293 | mov [NUMBER_OF_FATS],eax |
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294 | imul eax,[SECTORS_PER_FAT] |
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295 | add eax,[FAT_START] |
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296 | mov [ROOT_START],eax ; rootdir = fat_start + fat_size * fat_count |
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297 | add eax,[ROOT_SECTORS] ; rootdir sectors should be 0 on fat32 |
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298 | mov [DATA_START],eax ; data area = rootdir + rootdir_size |
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299 | |||
300 | movzx eax,word [ebx+0x13] ; total sector count <65536 |
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301 | test eax,eax |
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302 | jnz fat16_total |
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303 | mov eax,[ebx+0x20] ; total sector count |
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304 | fat16_total: |
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305 | add eax,[PARTITION_START] |
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306 | dec eax |
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307 | mov [PARTITION_END],eax |
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308 | inc eax |
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309 | sub eax,[DATA_START] ; eax = count of data sectors |
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310 | xor edx,edx |
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311 | div dword [SECTORS_PER_CLUSTER] |
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312 | inc eax |
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313 | mov [LAST_CLUSTER],eax |
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314 | dec eax ; cluster count |
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315 | |||
316 | ; limits by Microsoft Hardware White Paper v1.03 |
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317 | cmp eax,4085 ; 0xff5 |
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318 | jb problem_fat_dec_count ; fat12 not supported |
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319 | cmp eax,65525 ; 0xfff5 |
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320 | jb fat16_partition |
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321 | |||
322 | fat32_partition: |
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323 | mov eax,[ebx+0x2c] ; rootdir cluster |
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324 | mov [ROOT_CLUSTER],eax |
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325 | movzx eax,word [ebx+0x30] ; fs info sector |
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326 | add eax,[PARTITION_START] |
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327 | mov [ADR_FSINFO],eax |
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328 | |||
329 | popad |
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330 | |||
331 | mov [fatRESERVED],0x0FFFFFF6 |
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332 | mov [fatBAD],0x0FFFFFF7 |
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333 | mov [fatEND],0x0FFFFFF8 |
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334 | mov [fatMASK],0x0FFFFFFF |
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335 | mov [fat_type],32 ; Fat32 |
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336 | mov [hd1_status],0 ; free |
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337 | ret |
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338 | |||
339 | fat16_partition: |
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340 | xor eax,eax |
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341 | mov [ROOT_CLUSTER],eax |
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342 | |||
343 | popad |
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344 | |||
345 | mov [fatRESERVED],0x0000FFF6 |
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346 | mov [fatBAD],0x0000FFF7 |
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347 | mov [fatEND],0x0000FFF8 |
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348 | mov [fatMASK],0x0000FFFF |
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349 | mov [fat_type],16 ; Fat16 |
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350 | mov [hd1_status],0 ; free |
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351 | ret65536 |