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Rev | Author | Line No. | Line |
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431 | serge | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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2465 | Serge | 3 | ;; Copyright (C) KolibriOS team 2004-2011. All rights reserved. ;; |
431 | serge | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
593 | mikedld | 8 | $Revision: 2465 $ |
9 | |||
10 | |||
2434 | Serge | 11 | ;************************************************************* |
1410 | turbanoff | 12 | ;* 13.02.2010 Find all partition and check supported FS |
578 | mario79 | 13 | ;* 12.07.2007 Check all 4 entry of MBR and EMBR |
14 | ;* 29.04.2006 Elimination of hangup after the |
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15 | ;* expiration hd_wait_timeout - Mario79 |
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16 | ;* 28.01.2006 find all Fat16/32 partition in all input point |
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17 | ;* to MBR - Mario79 |
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65 | mario79 | 18 | ;************************************************************* |
19 | |||
277 | diamond | 20 | uglobal |
65 | mario79 | 21 | align 4 |
256 | diamond | 22 | |
65 | mario79 | 23 | ;****************************************************** |
431 | serge | 24 | ; Please do not change this place - variables in text |
65 | mario79 | 25 | ; Mario79 |
26 | ; START place |
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27 | ;****************************************************** |
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28 | PARTITION_START dd 0x3f |
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29 | PARTITION_END dd 0 |
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1410 | turbanoff | 30 | fs_type db 0 ; 1=NTFS, 2=EXT2/3, 16=FAT16, 32=FAT32 |
277 | diamond | 31 | align 4 |
256 | diamond | 32 | |
33 | fs_dependent_data_start: |
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34 | ; FATxx data |
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35 | |||
65 | mario79 | 36 | SECTORS_PER_FAT dd 0x1f3a |
37 | NUMBER_OF_FATS dd 0x2 |
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38 | SECTORS_PER_CLUSTER dd 0x8 |
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39 | BYTES_PER_SECTOR dd 0x200 ; Note: if BPS <> 512 need lots of changes |
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40 | ROOT_CLUSTER dd 2 ; first rootdir cluster |
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41 | FAT_START dd 0 ; start of fat table |
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42 | ROOT_START dd 0 ; start of rootdir (only fat16) |
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43 | ROOT_SECTORS dd 0 ; count of rootdir sectors (only fat16) |
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44 | DATA_START dd 0 ; start of data area (=first cluster 2) |
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45 | LAST_CLUSTER dd 0 ; last availabe cluster |
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46 | ADR_FSINFO dd 0 ; used only by fat32 |
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47 | |||
48 | fatRESERVED dd 0x0FFFFFF6 |
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49 | fatBAD dd 0x0FFFFFF7 |
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50 | fatEND dd 0x0FFFFFF8 |
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51 | fatMASK dd 0x0FFFFFFF |
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52 | |||
649 | diamond | 53 | fatStartScan dd 2 |
54 | |||
256 | diamond | 55 | fs_dependent_data_end: |
321 | diamond | 56 | file_system_data_size = $ - PARTITION_START |
57 | if file_system_data_size > 96 |
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2434 | Serge | 58 | ERROR: |
59 | sizeof(file system data) too big! |
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1379 | turbanoff | 60 | end if |
256 | diamond | 61 | |
62 | virtual at fs_dependent_data_start |
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63 | ; NTFS data |
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64 | ntfs_data: |
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65 | .sectors_per_cluster dd ? |
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66 | .mft_cluster dd ? |
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67 | .mftmirr_cluster dd ? |
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68 | .frs_size dd ? ; FRS size in bytes |
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69 | .iab_size dd ? ; IndexAllocationBuffer size in bytes |
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70 | .frs_buffer dd ? |
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71 | .iab_buffer dd ? |
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72 | .mft_retrieval dd ? |
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73 | .mft_retrieval_size dd ? |
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74 | .mft_retrieval_alloc dd ? |
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75 | .mft_retrieval_end dd ? |
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76 | .cur_index_size dd ? |
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77 | .cur_index_buf dd ? |
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78 | if $ > fs_dependent_data_end |
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2434 | Serge | 79 | ERROR: |
80 | increase sizeof(fs_dependent_data)! |
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256 | diamond | 81 | end if |
1379 | turbanoff | 82 | end virtual |
83 | |||
1378 | turbanoff | 84 | virtual at fs_dependent_data_start |
85 | ; EXT2 data |
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86 | ext2_data: |
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1379 | turbanoff | 87 | .log_block_size dd ? |
88 | .block_size dd ? |
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89 | .count_block_in_block dd ? |
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90 | .blocks_per_group dd ? |
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91 | .inodes_per_group dd ? |
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92 | .global_desc_table dd ? |
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2434 | Serge | 93 | .root_inode dd ? ; pointer to root inode in memory |
1379 | turbanoff | 94 | .inode_size dd ? |
2434 | Serge | 95 | .count_pointer_in_block dd ? ; block_size / 4 |
96 | .count_pointer_in_block_square dd ? ; (block_size / 4)**2 |
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1379 | turbanoff | 97 | .ext2_save_block dd ? ; блок на глобальную 1 процедуру |
98 | .ext2_temp_block dd ? ; блок для мелких процедур |
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99 | .ext2_save_inode dd ? ; inode на глобальную процедуру |
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2434 | Serge | 100 | .ext2_temp_inode dd ? ; inode для мелких процедур |
101 | .sb dd ? ; superblock |
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1419 | turbanoff | 102 | .groups_count dd ? |
1378 | turbanoff | 103 | if $ > fs_dependent_data_end |
2434 | Serge | 104 | ERROR: |
105 | increase sizeof(fs_dependent_data)! |
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1378 | turbanoff | 106 | end if |
256 | diamond | 107 | end virtual |
1379 | turbanoff | 108 | |
65 | mario79 | 109 | ;*************************************************************************** |
110 | ; End place |
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111 | ; Mario79 |
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112 | ;*************************************************************************** |
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277 | diamond | 113 | endg |
114 | iglobal |
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65 | mario79 | 115 | |
116 | partition_types: ; list of fat16/32 partitions |
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117 | db 0x04 ; DOS: fat16 <32M |
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118 | db 0x06 ; DOS: fat16 >32M |
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119 | db 0x0b ; WIN95: fat32 |
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120 | db 0x0c ; WIN95: fat32, LBA-mapped |
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121 | db 0x0e ; WIN95: fat16, LBA-mapped |
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122 | db 0x14 ; Hidden DOS: fat16 <32M |
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123 | db 0x16 ; Hidden DOS: fat16 >32M |
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124 | db 0x1b ; Hidden WIN95: fat32 |
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125 | db 0x1c ; Hidden WIN95: fat32, LBA-mapped |
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126 | db 0x1e ; Hidden WIN95: fat16, LBA-mapped |
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127 | db 0xc4 ; DRDOS/secured: fat16 <32M |
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128 | db 0xc6 ; DRDOS/secured: fat16 >32M |
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129 | db 0xcb ; DRDOS/secured: fat32 |
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130 | db 0xcc ; DRDOS/secured: fat32, LBA-mapped |
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131 | db 0xce ; DRDOS/secured: fat16, LBA-mapped |
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132 | db 0xd4 ; Old Multiuser DOS secured: fat16 <32M |
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133 | db 0xd6 ; Old Multiuser DOS secured: fat16 >32M |
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256 | diamond | 134 | db 0x07 ; NTFS |
1379 | turbanoff | 135 | db 0x27 ; NTFS, hidden |
1378 | turbanoff | 136 | db 0x83 ; Linux native file system (ext2fs) |
65 | mario79 | 137 | partition_types_end: |
138 | |||
139 | |||
140 | extended_types: ; list of extended partitions |
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141 | db 0x05 ; DOS: extended partition |
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142 | db 0x0f ; WIN95: extended partition, LBA-mapped |
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143 | db 0xc5 ; DRDOS/secured: extended partition |
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144 | db 0xd5 ; Old Multiuser DOS secured: extended partition |
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145 | extended_types_end: |
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146 | |||
147 | endg |
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148 | |||
149 | ; Partition chain used: |
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1379 | turbanoff | 150 | ; MBR <--------------------- |
151 | ; | | |
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152 | ; |-> PARTITION1 | |
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153 | ; |-> EXTENDED PARTITION - ;not need be second partition |
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154 | ; |-> PARTITION3 |
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155 | ; |-> PARTITION4 |
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156 | |||
1378 | turbanoff | 157 | set_PARTITION_variables: |
158 | set_FAT32_variables: ;deprecated |
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2434 | Serge | 159 | and [problem_partition], 0 |
160 | call reserve_hd1 |
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161 | call reserve_hd_channel |
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65 | mario79 | 162 | |
2434 | Serge | 163 | pushad |
709 | diamond | 164 | |
2434 | Serge | 165 | cmp dword [hdpos], 0 |
166 | je problem_hd |
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65 | mario79 | 167 | |
2434 | Serge | 168 | xor ecx, ecx ; partition count |
1410 | turbanoff | 169 | ;or edx,-1 ; flag for partition |
2434 | Serge | 170 | xor eax, eax ; address MBR |
171 | xor ebp, ebp ; extended partition start |
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65 | mario79 | 172 | |
1378 | turbanoff | 173 | new_mbr: |
2434 | Serge | 174 | test ebp, ebp ; is there extended partition? (MBR or EMBR) |
175 | jnz extended_already_set; yes |
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176 | xchg ebp, eax ; no. set it now |
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65 | mario79 | 177 | |
178 | extended_already_set: |
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2434 | Serge | 179 | add eax, ebp ; mbr=mbr+0, ext_part=ext_start+relat_start |
180 | mov ebx, buffer |
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181 | call hd_read |
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182 | cmp [hd_error], 0 |
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183 | jne problem_hd |
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65 | mario79 | 184 | |
2434 | Serge | 185 | cmp word [ebx+0x1fe], 0xaa55; is it valid boot sector? |
186 | jnz end_partition_chain |
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187 | push eax ; push only one time |
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188 | cmp dword [ebx+0x1be+0xc], 0; skip over empty partition |
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189 | jnz test_primary_partition_0 |
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190 | cmp dword [ebx+0x1be+0xc+16], 0 |
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191 | jnz test_primary_partition_1 |
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192 | cmp dword [ebx+0x1be+0xc+16+16], 0 |
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193 | jnz test_primary_partition_2 |
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194 | cmp dword [ebx+0x1be+0xc+16+16+16], 0 |
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195 | jnz test_primary_partition_3 |
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196 | pop eax |
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197 | jmp end_partition_chain |
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1378 | turbanoff | 198 | |
199 | test_primary_partition_0: |
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2434 | Serge | 200 | mov al, [ebx+0x1be+4]; get primary partition type |
201 | call scan_partition_types |
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202 | jnz test_primary_partition_1; no. skip over |
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65 | mario79 | 203 | |
2434 | Serge | 204 | inc ecx |
205 | cmp ecx, [known_part]; is it wanted partition? |
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206 | jnz test_primary_partition_1; no |
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207 | |||
1410 | turbanoff | 208 | pop eax |
209 | ;mov edx, eax ; start sector |
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2434 | Serge | 210 | add eax, [ebx+0x1be+8] ; add relative start |
1410 | turbanoff | 211 | ;mov [PARTITON_START],edx |
2434 | Serge | 212 | ;push edx |
1410 | turbanoff | 213 | mov edx, [ebx+0x1be+12] ; length |
214 | ;add edx, eax ; add length |
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215 | ;dec edx ; PARTITION_END is inclusive |
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216 | ;mov [PARTITION_END], edx ; note that this can be changed |
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256 | diamond | 217 | ; when file system data will be available |
1410 | turbanoff | 218 | mov cl, [ebx+0x1be+4] ; fs_type |
219 | ;mov [fs_type], dl ; save for FS recognizer (separate FAT vs NTFS) |
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2434 | Serge | 220 | ;pop edx |
1410 | turbanoff | 221 | jmp hd_and_partition_ok |
256 | diamond | 222 | |
1378 | turbanoff | 223 | test_primary_partition_1: |
2434 | Serge | 224 | mov al, [ebx+0x1be+4+16]; get primary partition type |
225 | call scan_partition_types |
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226 | jnz test_primary_partition_2 ; no. skip over |
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65 | mario79 | 227 | |
2434 | Serge | 228 | inc ecx |
229 | cmp ecx, [known_part]; is it wanted partition? |
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230 | jnz test_primary_partition_2 ; no |
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65 | mario79 | 231 | |
2434 | Serge | 232 | pop eax |
233 | add eax, [ebx+0x1be+8+16] |
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234 | mov edx, [ebx+0x1be+12+16] |
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235 | mov cl, [ebx+0x1be+4+16] |
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236 | jmp hd_and_partition_ok |
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237 | |||
1410 | turbanoff | 238 | ;mov edx, eax |
239 | ;add edx, [ebx+0x1be+8+16] |
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240 | ;push edx |
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241 | ;add edx, [ebx+0x1be+12+16] |
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242 | ;dec edx |
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243 | ;mov [PARTITION_END], edx |
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244 | ;mov al, [ebx+0x1be+4+16] |
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245 | ;mov [fs_type], dl |
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246 | ;pop edx |
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65 | mario79 | 247 | |
1378 | turbanoff | 248 | test_primary_partition_2: |
2434 | Serge | 249 | mov al, [ebx+0x1be+4+16+16]; get primary partition type |
250 | call scan_partition_types |
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251 | jnz test_primary_partition_3 ; no. skip over |
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65 | mario79 | 252 | |
2434 | Serge | 253 | inc ecx |
254 | cmp ecx, [known_part]; is it wanted partition? |
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255 | jnz test_primary_partition_3 ; no |
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256 | |||
257 | pop eax |
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258 | add eax, [ebx+0x1be+8+16+16] |
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259 | mov edx, [ebx+0x1be+12+16+16] |
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260 | mov cl, [ebx+0x1be+4+16+16] |
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1410 | turbanoff | 261 | jmp hd_and_partition_ok |
262 | ;mov edx, eax |
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263 | ;add edx, [ebx+0x1be+8+16+16] |
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264 | ;push edx |
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265 | ;add edx, [ebx+0x1be+12+16+16] |
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266 | ;dec edx |
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267 | ;mov [PARTITION_END], edx |
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268 | ;mov al, [ebx+0x1be+4+16+16] |
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269 | ;mov [fs_type], dl |
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270 | ;pop edx |
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65 | mario79 | 271 | |
1378 | turbanoff | 272 | test_primary_partition_3: |
2434 | Serge | 273 | mov al, [ebx+0x1be+4+16+16+16]; get primary partition type |
274 | call scan_partition_types |
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275 | jnz test_ext_partition_0 ; no. skip over |
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65 | mario79 | 276 | |
2434 | Serge | 277 | inc ecx |
278 | cmp ecx, [known_part]; is it wanted partition? |
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279 | jnz test_ext_partition_0; no |
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65 | mario79 | 280 | |
2434 | Serge | 281 | pop eax |
282 | add eax, [ebx+0x1be+8+16+16+16] |
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283 | mov edx, [ebx+0x1be+12+16+16+16] |
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284 | mov cl, [ebx+0x1be+4+16+16+16] |
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285 | jmp hd_and_partition_ok |
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286 | |||
1410 | turbanoff | 287 | ;mov edx, eax |
288 | ;add edx, [ebx+0x1be+8+16+16+16] |
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289 | ;push edx |
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290 | ;add edx, [ebx+0x1be+12+16+16+16] |
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291 | ;dec edx |
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292 | ;mov [PARTITION_END], edx |
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293 | ;mov al, [ebx+0x1be+4+16+16+16] |
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294 | ;mov [fs_type], dl |
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295 | ;pop edx |
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65 | mario79 | 296 | |
2434 | Serge | 297 | test_ext_partition_0: |
298 | pop eax ; просто выкидываем из стека |
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299 | mov al, [ebx+0x1be+4]; get extended partition type |
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300 | call scan_extended_types |
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301 | jnz test_ext_partition_1 |
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65 | mario79 | 302 | |
2434 | Serge | 303 | mov eax, [ebx+0x1be+8]; add relative start |
304 | test eax, eax ; is there extended partition? |
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305 | jnz new_mbr ; yes. read it |
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65 | mario79 | 306 | |
1378 | turbanoff | 307 | test_ext_partition_1: |
2434 | Serge | 308 | mov al, [ebx+0x1be+4+16]; get extended partition type |
309 | call scan_extended_types |
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310 | jnz test_ext_partition_2 |
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65 | mario79 | 311 | |
2434 | Serge | 312 | mov eax, [ebx+0x1be+8+16]; add relative start |
313 | test eax, eax ; is there extended partition? |
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314 | jnz new_mbr ; yes. read it |
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65 | mario79 | 315 | |
1378 | turbanoff | 316 | test_ext_partition_2: |
2434 | Serge | 317 | mov al, [ebx+0x1be+4+16+16]; get extended partition type |
318 | call scan_extended_types |
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319 | jnz test_ext_partition_3 |
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65 | mario79 | 320 | |
2434 | Serge | 321 | mov eax, [ebx+0x1be+8+16+16]; add relative start |
322 | test eax, eax ; is there extended partition? |
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323 | jnz new_mbr ; yes. read it |
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1378 | turbanoff | 324 | |
325 | test_ext_partition_3: |
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2434 | Serge | 326 | mov al, [ebx+0x1be+4+16+16+16]; get extended partition type |
327 | call scan_extended_types |
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328 | jnz end_partition_chain; no. end chain |
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65 | mario79 | 329 | |
2434 | Serge | 330 | mov eax, [ebx+0x1be+8+16+16+16]; get start of extended partition |
331 | test eax, eax ; is there extended partition? |
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332 | jnz new_mbr ; yes. read it |
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1378 | turbanoff | 333 | |
65 | mario79 | 334 | end_partition_chain: |
1410 | turbanoff | 335 | ;mov [partition_count],ecx |
65 | mario79 | 336 | |
1410 | turbanoff | 337 | ;cmp edx,-1 ; found wanted partition? |
338 | ;jnz hd_and_partition_ok ; yes. install it |
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2434 | Serge | 339 | ;jmp problem_partition_or_fat |
340 | problem_hd: |
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341 | or [problem_partition], 2 |
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342 | jmp return_from_part_set |
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65 | mario79 | 343 | |
1410 | turbanoff | 344 | |
65 | mario79 | 345 | scan_partition_types: |
2434 | Serge | 346 | push ecx |
347 | mov edi, partition_types |
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348 | mov ecx, partition_types_end-partition_types |
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349 | cld |
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350 | repne scasb ; is partition type ok? |
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351 | pop ecx |
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352 | ret |
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65 | mario79 | 353 | |
354 | scan_extended_types: |
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2434 | Serge | 355 | push ecx |
356 | mov edi, extended_types |
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357 | mov ecx, extended_types_end-extended_types |
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358 | cld |
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359 | repne scasb ; is it extended partition? |
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360 | pop ecx |
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361 | ret |
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65 | mario79 | 362 | |
363 | problem_fat_dec_count: ; bootsector is missing or another problem |
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1410 | turbanoff | 364 | ; dec [partition_count] ; remove it from partition_count |
65 | mario79 | 365 | |
366 | problem_partition_or_fat: |
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2434 | Serge | 367 | or [problem_partition], 1 |
368 | |||
1410 | turbanoff | 369 | return_from_part_set: |
2434 | Serge | 370 | popad |
1410 | turbanoff | 371 | ;mov [fs_type],0 |
2434 | Serge | 372 | call free_hd_channel |
373 | mov [hd1_status], 0 ; free |
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374 | ret |
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65 | mario79 | 375 | |
2434 | Serge | 376 | hd_and_partition_ok: |
377 | |||
378 | ;eax = PARTITION_START edx=PARTITION_LENGTH cl=fs_type |
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379 | mov [fs_type], cl |
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1410 | turbanoff | 380 | ;mov eax,edx |
2434 | Serge | 381 | mov [PARTITION_START], eax |
382 | add edx, eax |
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383 | dec edx |
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384 | mov [PARTITION_END], edx |
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65 | mario79 | 385 | |
1410 | turbanoff | 386 | ; mov edx, [PARTITION_END] |
387 | ; sub edx, eax |
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388 | ; inc edx ; edx = length of partition зачем оно нам?? |
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389 | |||
256 | diamond | 390 | ; mov [hd_setup],1 |
2434 | Serge | 391 | mov ebx, buffer |
392 | call hd_read ; read boot sector of partition |
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256 | diamond | 393 | cmp [hd_error], 0 |
394 | jz boot_read_ok |
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395 | cmp [fs_type], 7 |
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396 | jnz problem_fat_dec_count |
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397 | ; NTFS duplicates bootsector: |
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398 | ; NT4/2k/XP+ saves bootsector copy in the end of disk |
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399 | ; NT 3.51 saves bootsector copy in the middle of disk |
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400 | and [hd_error], 0 |
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401 | mov eax, [PARTITION_END] |
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402 | call hd_read |
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403 | cmp [hd_error], 0 |
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404 | jnz @f |
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405 | call ntfs_test_bootsec |
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406 | jnc boot_read_ok |
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407 | @@: |
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408 | and [hd_error], 0 |
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409 | mov eax, edx |
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410 | shr eax, 1 |
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411 | add eax, [PARTITION_START] |
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412 | call hd_read |
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413 | cmp [hd_error], 0 |
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1378 | turbanoff | 414 | jnz problem_fat_dec_count ; no chance... |
256 | diamond | 415 | boot_read_ok: |
1378 | turbanoff | 416 | |
256 | diamond | 417 | ; if we are running on NTFS, check bootsector |
74 | mario79 | 418 | |
1378 | turbanoff | 419 | call ntfs_test_bootsec ; test ntfs |
1379 | turbanoff | 420 | jnc ntfs_setup |
421 | |||
422 | call ext2_test_superblock ; test ext2fs |
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1410 | turbanoff | 423 | jnc ext2_setup |
1379 | turbanoff | 424 | |
2434 | Serge | 425 | mov eax, [PARTITION_START] ;ext2 test changes [buffer] |
1410 | turbanoff | 426 | call hd_read |
1379 | turbanoff | 427 | cmp [hd_error], 0 |
1410 | turbanoff | 428 | jnz problem_fat_dec_count |
1378 | turbanoff | 429 | |
2434 | Serge | 430 | cmp word [ebx+0x1fe], 0xaa55; is it valid boot sector? |
431 | jnz problem_fat_dec_count |
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65 | mario79 | 432 | |
2434 | Serge | 433 | movzx eax, word [ebx+0xe]; sectors reserved |
434 | add eax, [PARTITION_START] |
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435 | mov [FAT_START], eax; fat_start = partition_start + reserved |
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65 | mario79 | 436 | |
2434 | Serge | 437 | movzx eax, byte [ebx+0xd]; sectors per cluster |
438 | test eax, eax |
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439 | jz problem_fat_dec_count |
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440 | mov [SECTORS_PER_CLUSTER], eax |
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65 | mario79 | 441 | |
2434 | Serge | 442 | movzx ecx, word [ebx+0xb]; bytes per sector |
443 | cmp ecx, 0x200 |
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444 | jnz problem_fat_dec_count |
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445 | mov [BYTES_PER_SECTOR], ecx |
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65 | mario79 | 446 | |
2434 | Serge | 447 | movzx eax, word [ebx+0x11]; count of rootdir entries (=0 fat32) |
448 | mov edx, 32 |
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449 | mul edx |
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450 | dec ecx |
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451 | add eax, ecx ; round up if not equal count |
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452 | inc ecx ; bytes per sector |
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453 | div ecx |
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454 | mov [ROOT_SECTORS], eax; count of rootdir sectors |
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65 | mario79 | 455 | |
2434 | Serge | 456 | movzx eax, word [ebx+0x16]; sectors per fat <65536 |
457 | test eax, eax |
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458 | jnz fat16_fatsize |
||
459 | mov eax, [ebx+0x24] ; sectors per fat |
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65 | mario79 | 460 | fat16_fatsize: |
2434 | Serge | 461 | mov [SECTORS_PER_FAT], eax |
65 | mario79 | 462 | |
2434 | Serge | 463 | movzx eax, byte [ebx+0x10]; number of fats |
464 | test eax, eax ; if 0 it's not fat partition |
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465 | jz problem_fat_dec_count |
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466 | mov [NUMBER_OF_FATS], eax |
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467 | imul eax, [SECTORS_PER_FAT] |
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468 | add eax, [FAT_START] |
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469 | mov [ROOT_START], eax; rootdir = fat_start + fat_size * fat_count |
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470 | add eax, [ROOT_SECTORS]; rootdir sectors should be 0 on fat32 |
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471 | mov [DATA_START], eax; data area = rootdir + rootdir_size |
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65 | mario79 | 472 | |
2434 | Serge | 473 | movzx eax, word [ebx+0x13]; total sector count <65536 |
474 | test eax, eax |
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475 | jnz fat16_total |
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476 | mov eax, [ebx+0x20] ; total sector count |
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65 | mario79 | 477 | fat16_total: |
2434 | Serge | 478 | add eax, [PARTITION_START] |
479 | dec eax |
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480 | mov [PARTITION_END], eax |
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481 | inc eax |
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482 | sub eax, [DATA_START]; eax = count of data sectors |
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483 | xor edx, edx |
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484 | div dword [SECTORS_PER_CLUSTER] |
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485 | inc eax |
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486 | mov [LAST_CLUSTER], eax |
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487 | dec eax ; cluster count |
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488 | mov [fatStartScan], 2 |
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65 | mario79 | 489 | |
490 | ; limits by Microsoft Hardware White Paper v1.03 |
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2434 | Serge | 491 | cmp eax, 4085 ; 0xff5 |
492 | jb problem_fat_dec_count; fat12 not supported |
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493 | cmp eax, 65525 ; 0xfff5 |
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494 | jb fat16_partition |
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65 | mario79 | 495 | |
496 | fat32_partition: |
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2434 | Serge | 497 | mov eax, [ebx+0x2c] ; rootdir cluster |
498 | mov [ROOT_CLUSTER], eax |
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499 | movzx eax, word [ebx+0x30]; fs info sector |
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500 | add eax, [PARTITION_START] |
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501 | mov [ADR_FSINFO], eax |
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502 | call hd_read |
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503 | mov eax, [ebx+0x1ec] |
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504 | cmp eax, -1 |
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505 | jz @f |
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506 | mov [fatStartScan], eax |
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649 | diamond | 507 | @@: |
65 | mario79 | 508 | |
2434 | Serge | 509 | popad |
65 | mario79 | 510 | |
2434 | Serge | 511 | mov [fatRESERVED], 0x0FFFFFF6 |
512 | mov [fatBAD], 0x0FFFFFF7 |
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513 | mov [fatEND], 0x0FFFFFF8 |
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514 | mov [fatMASK], 0x0FFFFFFF |
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515 | mov [fs_type], 32 ; Fat32 |
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516 | call free_hd_channel |
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517 | mov [hd1_status], 0 ; free |
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518 | ret |
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65 | mario79 | 519 | |
520 | fat16_partition: |
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2434 | Serge | 521 | xor eax, eax |
522 | mov [ROOT_CLUSTER], eax |
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65 | mario79 | 523 | |
2434 | Serge | 524 | popad |
65 | mario79 | 525 | |
2434 | Serge | 526 | mov [fatRESERVED], 0x0000FFF6 |
527 | mov [fatBAD], 0x0000FFF7 |
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528 | mov [fatEND], 0x0000FFF8 |
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529 | mov [fatMASK], 0x0000FFFF |
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530 | mov [fs_type], 16 ; Fat16 |
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531 | call free_hd_channel |
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532 | mov [hd1_status], 0 ; free |
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533 | ret65536 |
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534 |