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Rev | Author | Line No. | Line |
---|---|---|---|
2783 | clevermous | 1 | ; KolibriOS bootloader |
2 | ; this code has been written by diamond in 2005,2006 specially for KolibriOS |
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3 | |||
4 | ; this code is loaded by ntldr to 0D00:0000 |
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5 | ; and by io.sys from config.sys to xxxx:0100 |
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6 | ; and by bootmgr in vista to 0000:7C00 |
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7 | format binary |
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8 | use16 |
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9 | |||
10 | org 0xD000 |
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11 | |||
12 | ; entry point for 9x booting |
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13 | call @f |
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14 | ; db 'd' xor 'i' xor 'a' xor 'm' xor 'o' xor 'n' xor 'd' |
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15 | db 'NTFS' |
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16 | |||
17 | ; file offset +7 |
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18 | ; may be changed by installator |
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19 | boot_drive db 80h |
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20 | partition_start dd -1 |
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21 | imgnameofs dw menuet_img_name |
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22 | |||
23 | @@: |
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24 | pop si |
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25 | sub si, 3 |
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26 | cmp si, 7C00h |
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27 | jz boot_vista |
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28 | mov si, load_question + 100h - 0D000h |
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29 | call out_string |
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30 | mov si, answer + 100h - 0D000h |
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31 | xxy: mov ah, 0 |
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32 | int 16h |
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33 | or al, 20h |
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34 | mov [si], al |
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35 | cmp al, 'y' |
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36 | jz xxz |
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37 | cmp al, 'n' |
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38 | jnz xxy |
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39 | ; continue load Windows |
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40 | ; call out_string |
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41 | ; ret |
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42 | out_string: |
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43 | lodsb |
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44 | test al, al |
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45 | jz .xxx |
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46 | mov ah, 0Eh |
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47 | mov bx, 7 |
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48 | int 10h |
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49 | jmp out_string |
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50 | .xxx: ret |
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51 | xxz: |
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52 | ; boot KolibriOS |
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53 | call out_string |
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54 | push 0 |
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55 | pop ds |
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56 | mov word [4], new01handler + 100h - 0D000h |
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57 | mov [6], cs |
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58 | pushf |
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59 | pop ax |
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60 | or ah, 1 |
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61 | push ax |
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62 | popf |
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63 | ; int 19h |
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64 | ; pushf ; there will be no iret |
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65 | call far [19h*4] |
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66 | xxt: |
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67 | ; TF has been cleared when entered new01handler |
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68 | ; pushf |
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69 | ; pop ax |
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70 | ; and ah, not 1 |
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71 | ; push ax |
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72 | ; popf |
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73 | push 0 |
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74 | pop ds |
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75 | cmp word [8*4+2], 0F000h |
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76 | jz @f |
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77 | les bx, [8*4] |
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78 | mov eax, [es:bx+1] |
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79 | mov [8*4], eax |
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80 | @@: |
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81 | mov si, 100h |
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82 | boot_vista: |
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83 | xor di, di |
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84 | push cs |
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85 | pop ds |
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86 | push 0D00h |
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87 | pop es |
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88 | mov cx, 2000h/2 |
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89 | rep movsw |
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90 | jmp 0D00h:0256h |
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91 | |||
92 | new01handler: |
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93 | ; [sp]=ip, [sp+2]=cs, [sp+4]=flags |
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94 | push bp |
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95 | mov bp, sp |
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96 | push bx |
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97 | push ds |
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98 | lds bx, [bp+2] |
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99 | cmp word [bx], 19cdh |
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100 | jz xxt |
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101 | pop ds |
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102 | pop bx |
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103 | pop bp |
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104 | iret |
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105 | |||
106 | relative_read: |
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107 | add eax, [partition_start] |
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108 | |||
109 | ; read from hard disk |
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110 | ; drive_size must be already initialized |
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111 | ; in: eax = absolute sector |
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112 | ; cx = number of sectors |
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113 | ; es:bx -> buffer |
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114 | read: |
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115 | pushad |
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116 | cmp eax, [drive_size] |
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117 | jb .old_style |
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118 | xor dx, dx |
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119 | ; new style - LBA, function 42 |
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120 | cmp [has_lba], dl |
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121 | jz disk_error |
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122 | ; allocate disk address packet on the stack |
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123 | ; qword +8: absolute block number |
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124 | push dx |
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125 | push dx |
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126 | ; push dword 0 ; dword +C is high dword |
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127 | push eax ; dword +8 is low dword |
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128 | ; dword +4: buffer address |
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129 | push es ; word +6 is segment |
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130 | push bx ; word +4 is offset |
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131 | ; word +2: number of blocks = 1 |
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132 | push 1 |
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133 | ; word +0: size of packet = 10h |
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134 | push 10h |
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135 | ; now pair ss:sp contain address of disk address packet |
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136 | .patch1: |
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137 | mov ax, 4200h |
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138 | mov dl, [boot_drive] |
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139 | mov si, sp |
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140 | push ds |
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141 | push ss |
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142 | pop ds |
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143 | int 13h |
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144 | pop ds |
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145 | lea sp, [si+10h] |
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146 | .end: |
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147 | popad |
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148 | jc disk_error |
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149 | add bx, 200h |
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150 | inc eax |
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151 | dec cx |
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152 | jnz read |
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153 | ret |
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154 | .old_style: |
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155 | ; old style - CHS, function 2 |
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156 | ; convert absolute sector in eax to cylinder-head-sector coordinates |
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157 | ; calculate sector |
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158 | xor edx, edx |
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159 | movzx ecx, [sectors] |
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160 | div ecx |
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161 | ; sectors are counted from 1 |
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162 | inc dl |
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163 | mov cl, dl ; low 6 bits of cl = sector number |
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164 | ; calculate head number |
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165 | ; shld edx, eax, 10h ; convert eax to dx:ax |
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166 | push eax |
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167 | pop ax |
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168 | pop dx |
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169 | div [heads] |
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170 | mov dh, dl ; dh = head |
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171 | mov ch, al ; ch = low 8 bits of cylinder |
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172 | shl ah, 6 |
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173 | or cl, ah ; high 2 bits of cl = high 2 bits of cylinder |
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174 | .patch2: |
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175 | mov ax, 201h ; function 2, al=1 - number of sectors |
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176 | mov dl, [boot_drive] |
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177 | int 13h |
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178 | jmp .end |
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179 | |||
180 | disk_error: |
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181 | mov si, disk_error_msg |
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182 | call out_string |
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183 | jmp $ |
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184 | |||
185 | answer db ? |
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186 | db 13,10 |
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187 | has_lba db 0 |
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188 | |||
189 | disk_error_msg db 'Disk read error!',0 |
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190 | start_msg db 2,' KolibriOS bootloader, running on ',0 |
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191 | errfs_msg db 'unknown filesystem, cannot continue',0 |
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192 | fat16_msg db 'FAT12/FAT16 - unsupported',13,10,0 |
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193 | fat32_msg db 'FAT32',13,10,0 |
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194 | ntfs_msg db 'NTFS',13,10,0 |
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195 | error_msg db 'Error' |
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196 | colon db ': ',0 |
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197 | mft_string db 'MFT',0 |
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198 | root_string db '\',0 |
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199 | noindex_string db '$INDEX_ROOT not found',0 |
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200 | invalid_read_request_string db 'cannot read attribute',0 |
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201 | nodata_string db '$DATA ' |
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202 | notfound_string db 'not found',0 |
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203 | directory_string db 'is a directory',0 |
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204 | notdir_string db 'not a directory',0 |
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205 | fragmented_string db 'too fragmented file',0 |
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206 | bad_cluster_string db 'bad cluster',0 |
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207 | exmem_string db 'extended memory error',0 |
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208 | |||
209 | load_question db 'Load KolibriOS? [y/n]: ',0 |
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210 | |||
211 | repeat 0D256h - $ |
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212 | db 1 |
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213 | end repeat |
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214 | |||
215 | start: |
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216 | xor ax, ax |
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217 | mov ds, ax |
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218 | mov es, ax |
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219 | ; our stack is 4Kb-2b!!! (0xFFE) |
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220 | mov ss, ax |
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221 | mov esp, 0FFFEh |
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222 | cld |
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223 | sti |
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224 | ; calculate drive size |
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225 | mov dl, [boot_drive] |
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226 | mov ah, 8 ; 8 = get drive parameters |
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227 | int 13h |
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228 | ; now: CF is set on error; |
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229 | ; ch = low 8 bits of maximum cylinder number |
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230 | ; cl : low 6 bits makes maximum sector number, high 2 bits are high 2 bits of maximum cylinder number |
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231 | ; dh = maximum head number |
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232 | jnc @f |
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233 | mov cx, -1 |
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234 | mov dh, cl |
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235 | @@: |
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236 | movzx ax, dh |
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237 | inc ax |
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238 | ; ax = number of heads |
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239 | mov [heads], ax |
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240 | mov dl, cl |
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241 | and dx, 3Fh |
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242 | ; dx = number of sectors |
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243 | ; (note that sectors are counted from 1, and maximum sector number = number of sectors) |
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244 | mov [sectors], dx |
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245 | mul dx |
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246 | xchg cl, ch |
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247 | shr ch, 6 |
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248 | inc cx |
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249 | ; cx = number of cylinders |
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250 | mov [cyls], cx |
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251 | mul cx |
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252 | mov word [drive_size], ax |
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253 | mov word [drive_size+2], dx |
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254 | ; this drive supports LBA? |
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255 | mov dl, [boot_drive] |
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256 | mov ah, 41h |
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257 | mov bx, 55AAh |
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258 | int 13h |
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259 | jc .no_lba |
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260 | cmp bx, 0AA55h |
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261 | jnz .no_lba |
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262 | test cl, 1 |
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263 | jz .no_lba |
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264 | inc [has_lba] |
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265 | .no_lba: |
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266 | ; say hi to user |
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267 | mov si, start_msg |
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268 | call out_string |
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269 | mov eax, [partition_start] |
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270 | cmp eax, -1 |
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271 | jnz @f |
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272 | ; now read first sector to determine file system type |
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273 | ; first sector of disk is MBR sector |
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274 | xor eax, eax |
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275 | mov cx, 1 |
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276 | mov bx, 500h |
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277 | call read |
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278 | mov eax, [6C6h] ; first disk |
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279 | mov [partition_start], eax |
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280 | @@: |
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281 | mov cx, 1 |
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282 | mov bx, 500h |
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283 | call read |
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284 | movzx ax, byte [50Dh] |
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285 | mov [sect_per_clust], ax |
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286 | ; determine file system |
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287 | cmp dword [536h], 'FAT1' |
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288 | jz fat1x |
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289 | cmp dword [552h], 'FAT3' |
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290 | jz fat32 |
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291 | cmp dword [503h], 'NTFS' |
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292 | jz ntfs |
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293 | ; mov si, errfs_msg ; already is |
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294 | call out_string |
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295 | jmp $ |
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296 | fat1x: |
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297 | mov si, fat16_msg |
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298 | call out_string |
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299 | jmp $ |
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300 | fat32: |
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301 | mov si, fat32_msg |
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302 | call out_string |
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303 | movzx eax, word [50Bh] ; bytes_per_sect |
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304 | movzx ebx, byte [50Dh] ; sects_per_clust |
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305 | mul ebx |
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306 | mov [cluster_size], eax |
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307 | movzx ebx, word [50Eh] ; reserved_sect |
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308 | mov [fat_start], ebx |
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309 | movzx eax, byte [510h] ; num_fats |
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310 | mul dword [524h] ; sect_fat |
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311 | add eax, ebx |
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312 | ; cluster 2 begins from sector eax |
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313 | movzx ebx, byte [50Dh] ; sects_per_clust |
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314 | sub eax, ebx |
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315 | sub eax, ebx |
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316 | mov [data_start], eax |
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317 | ; parse image name |
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318 | mov eax, [52Ch] ; root_cluster |
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319 | mov [cur_obj], root_string |
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320 | .parsedir: |
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321 | push ax |
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322 | mov si, [imgnameofs] |
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323 | push si |
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324 | @@: |
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325 | lodsb |
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326 | cmp al, '\' |
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327 | jz @f |
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328 | cmp al, 0 |
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329 | jnz @b |
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330 | @@: |
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331 | xchg ax, [esp+2] |
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332 | mov byte [si-1], 0 |
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333 | mov [imgnameofs], si |
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334 | call fat32_parse_dir |
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335 | pop cx |
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336 | test cl, cl |
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337 | jz .end |
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338 | test byte [di+0Bh], 10h |
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339 | mov si, notdir_string |
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340 | jz find_error_si |
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341 | jmp .parsedir |
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342 | .end: |
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343 | test byte [di+0Bh], 10h |
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344 | mov si, directory_string |
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345 | jnz find_error_si |
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346 | ; parse FAT chunk |
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347 | ; runlist at 2000:0000 |
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348 | mov di, 5 |
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349 | push 2000h |
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350 | pop es |
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351 | mov byte [es:di-5], 1 ; of course, non-resident |
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352 | mov dword [es:di-4], 1 |
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353 | stosd |
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354 | .parsefat: |
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355 | push es |
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356 | push ds |
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357 | pop es |
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358 | call next_cluster |
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359 | pop es |
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360 | jnc .done |
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361 | mov ecx, [es:di-8] |
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362 | add ecx, [es:di-4] |
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363 | cmp eax, ecx |
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364 | jz .contc |
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365 | mov dword [es:di], 1 |
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366 | scasd |
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367 | stosd |
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368 | jmp .parsefat |
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369 | .contc: |
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370 | inc dword [es:di-8] |
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371 | jmp .parsefat |
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372 | .done: |
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373 | xor eax, eax |
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374 | stosd |
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375 | jmp read_img_file |
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376 | |||
377 | ntfs: |
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378 | mov si, ntfs_msg |
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379 | call out_string |
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380 | movzx eax, word [50Bh] ; bpb_bytes_per_sect |
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381 | push eax |
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382 | movzx ebx, byte [50Dh] ; bpb_sects_per_clust |
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383 | mul ebx |
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384 | mov [cluster_size], eax |
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385 | mov [data_start], 0 |
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386 | mov ecx, [540h] ; frs_size |
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387 | cmp cl, 0 |
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388 | jg .1 |
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389 | neg cl |
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390 | xor eax, eax |
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391 | inc eax |
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392 | shl eax, cl |
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393 | jmp .2 |
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394 | .1: |
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395 | mul ecx |
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396 | .2: |
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397 | mov [frs_size], eax |
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398 | pop ebx |
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399 | xor edx, edx |
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400 | div ebx |
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401 | mov [frs_sectors], ax |
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402 | ; read first MFT record - description of MFT itself |
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403 | mov [cur_obj], mft_string |
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404 | movzx eax, byte [50Dh] ; bpb_sects_per_clust |
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405 | mul dword [530h] ; mft_cluster |
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406 | mov cx, [frs_sectors] |
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407 | mov bx, 4000h |
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408 | mov di, bx |
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409 | push bx |
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410 | call relative_read |
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411 | call restore_usa |
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412 | ; scan for unnamed $DATA attribute |
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413 | pop di |
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414 | mov ax, 80h ; $DATA |
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415 | mov bx, 700h |
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416 | call load_attr |
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417 | mov si, nodata_string |
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418 | jc find_error_si |
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419 | mov [free], bx |
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420 | ; load menuet.img |
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421 | ; parse image name |
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422 | mov eax, 5 ; root cluster |
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423 | mov [cur_obj], root_string |
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424 | .parsedir: |
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425 | push ax |
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426 | mov si, [imgnameofs] |
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427 | push si |
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428 | @@: |
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429 | lodsb |
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430 | cmp al, '\' |
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431 | jz @f |
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432 | cmp al, 0 |
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433 | jnz @b |
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434 | @@: |
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435 | xchg ax, [esp+2] |
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436 | mov byte [si-1], 0 |
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437 | mov [imgnameofs], si |
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438 | call ntfs_parse_dir |
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439 | pop cx |
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440 | test cl, cl |
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441 | jnz .parsedir |
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442 | read_img_file: |
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443 | xor si, si |
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444 | push es |
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445 | pop fs |
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446 | ; yes! Now read file to 0x100000 |
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447 | lods byte [fs:si] |
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448 | cmp al, 0 ; assume nonresident attr |
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449 | mov si, invalid_read_request_string |
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450 | jz find_error_si |
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451 | mov si, 1 |
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452 | xor edi, edi |
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453 | ; read buffer to 1000:0000 and move it to extended memory |
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454 | push 1000h |
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455 | pop es |
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456 | xor bx, bx |
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457 | .img_read_block: |
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458 | lods dword [fs:si] ; eax=length |
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459 | xchg eax, ecx |
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460 | jecxz .img_read_done |
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461 | lods dword [fs:si] ; eax=disk cluster |
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462 | .img_read_cluster: |
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463 | pushad |
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464 | ; read part of file |
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465 | movzx ecx, byte [50Dh] |
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466 | mul ecx |
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467 | add eax, [data_start] |
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468 | call relative_read |
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469 | ; move it to extended memory |
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470 | mov ah, 87h |
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471 | mov ecx, [cluster_size] |
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472 | push ecx |
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473 | shr cx, 1 |
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474 | mov si, movedesc |
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475 | push es |
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476 | push ds |
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477 | pop es |
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478 | int 15h |
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479 | pop es |
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480 | test ah, ah |
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481 | mov si, exmem_string |
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482 | jnz find_error_si |
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483 | pop ecx |
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484 | add [dest_addr], ecx |
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485 | popad |
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486 | inc eax |
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487 | loop .img_read_cluster |
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488 | jmp .img_read_block |
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489 | .img_read_done: |
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490 | ; menuet.img loaded; now load kernel.mnt |
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491 | load_kernel: |
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492 | push ds |
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493 | pop es |
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494 | mov [cur_obj], kernel_mnt_name |
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495 | ; read boot sector |
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496 | xor eax, eax |
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497 | mov bx, 500h |
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498 | mov cx, 1 |
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499 | call read_img |
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500 | ; init vars |
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501 | mov ax, [50Eh] ; reserved_sect |
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502 | add ax, [51Ch] ; hidden |
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503 | mov word [fat_start], ax |
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504 | xchg ax, bx |
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505 | movzx ax, byte [510h] ; num_fats |
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506 | mul word [516h] ; fat_length |
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507 | add ax, bx |
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508 | ; read root dir |
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509 | mov bx, 700h |
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510 | mov cx, [511h] ; dir_entries |
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511 | add cx, 0Fh |
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512 | shr cx, 4 |
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513 | call read_img |
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514 | add ax, cx |
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515 | mov [img_data_start], ax |
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516 | shl cx, 9 |
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517 | mov di, bx |
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518 | add bx, cx |
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519 | mov byte [bx], 0 |
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520 | .scan_loop: |
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521 | cmp byte [di], 0 |
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522 | mov si, notfound_string |
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523 | jz find_error_si |
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524 | mov si, kernel_mnt_name |
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525 | call fat_compare_name |
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526 | jz .found |
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527 | and di, not 1Fh |
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528 | add di, 20h |
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529 | jmp .scan_loop |
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530 | .found: |
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531 | and di, not 1Fh |
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532 | mov si, directory_string |
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533 | test byte [di+0Bh], 10h |
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534 | jnz find_error_si |
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535 | ; found, now load it to 1000h:0000h |
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536 | mov ax, [di+1Ah] |
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537 | ; first cluster of kernel.mnt in ax |
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538 | ; translate it to sector on disk in menuet.img |
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539 | push ax |
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540 | dec ax |
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541 | dec ax |
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542 | movzx cx, byte [50Dh] |
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543 | mul cx |
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544 | add ax, [img_data_start] |
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545 | ; now ax is sector in menuet.img |
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546 | mov [kernel_mnt_in_img], ax |
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547 | div [sect_per_clust] |
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548 | ; now ax is cluster in menuet.img and |
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549 | ; dx is offset from the beginning of cluster |
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550 | movzx eax, ax |
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551 | push 2000h |
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552 | pop ds |
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553 | mov si, 1 |
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554 | .scani: |
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555 | sub eax, [si] |
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556 | jb .scanidone |
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557 | ; sanity check |
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558 | cmp dword [si], 0 |
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559 | push invalid_read_request_string |
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560 | jz find_error_sp |
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561 | pop cx |
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562 | ; next chunk |
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563 | add si, 8 |
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564 | jmp .scani |
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565 | .scanidone: |
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566 | add eax, [si] ; undo last subtract |
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567 | add eax, [si+4] ; get cluster |
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568 | push 0 |
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569 | pop ds |
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570 | movzx ecx, [sect_per_clust] |
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571 | push dx |
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572 | mul ecx ; get sector |
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573 | pop dx |
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574 | movzx edx, dx |
||
575 | add eax, edx |
||
576 | add eax, [data_start] |
||
577 | mov [kernel_mnt_1st], eax |
||
578 | pop ax |
||
579 | push 1000h |
||
580 | pop es |
||
581 | .read_loop: |
||
582 | push ax |
||
583 | xor bx, bx |
||
584 | call img_read_cluster |
||
585 | shl cx, 9-4 |
||
586 | mov ax, es |
||
587 | add ax, cx |
||
588 | mov es, ax |
||
589 | pop ax |
||
590 | call img_next_cluster |
||
591 | jc .read_loop |
||
592 | mov ax, 'KL' |
||
593 | mov si, loader_block |
||
594 | jmp 1000h:0000h |
||
595 | |||
596 | img_next_cluster: |
||
597 | mov bx, 700h |
||
598 | push ax |
||
599 | shr ax, 1 |
||
600 | add ax, [esp] |
||
601 | mov dx, ax |
||
602 | shr ax, 9 |
||
603 | add ax, word [fat_start] |
||
604 | mov cx, 2 |
||
605 | push es |
||
606 | push ds |
||
607 | pop es |
||
608 | call read_img |
||
609 | pop es |
||
610 | and dx, 1FFh |
||
611 | add bx, dx |
||
612 | mov ax, [bx] |
||
613 | pop cx |
||
614 | test cx, 1 |
||
615 | jz .1 |
||
616 | shr ax, 4 |
||
617 | .1: |
||
618 | and ax, 0FFFh |
||
619 | mov si, bad_cluster_string |
||
620 | cmp ax, 0FF7h |
||
621 | jz find_error_si |
||
622 | ret |
||
623 | img_read_cluster: |
||
624 | dec ax |
||
625 | dec ax |
||
626 | movzx cx, byte [50Dh] ; sects_per_clust |
||
627 | mul cx |
||
628 | add ax, [img_data_start] |
||
629 | movzx eax, ax |
||
630 | ; call read_img |
||
631 | ; ret |
||
632 | read_img: |
||
633 | ; in: ax = sector, es:bx->buffer, cx=length in sectors |
||
634 | pushad |
||
635 | movzx ebx, bx |
||
636 | mov si, movedesc |
||
637 | shl eax, 9 |
||
638 | add eax, 93100000h |
||
639 | mov dword [si+sou_addr-movedesc], eax |
||
640 | mov eax, 9300000h |
||
641 | mov ax, es |
||
642 | shl eax, 4 |
||
643 | add eax, ebx |
||
644 | mov [si+dest_addr-movedesc], eax |
||
645 | mov ah, 87h |
||
646 | shl cx, 8 ; mul 200h/2 |
||
647 | push es |
||
648 | push 0 |
||
649 | pop es |
||
650 | int 15h |
||
651 | pop es |
||
652 | cmp ah, 0 |
||
653 | mov si, exmem_string |
||
654 | jnz find_error_si |
||
655 | popad |
||
656 | ret |
||
657 | |||
658 | movedesc: |
||
659 | times 16 db 0 |
||
660 | ; source |
||
661 | dw 0xFFFF ; segment length |
||
662 | sou_addr dw 0000h ; linear address |
||
663 | db 1 ; linear address |
||
664 | db 93h ; access rights |
||
665 | dw 0 |
||
666 | ; destination |
||
667 | dw 0xFFFF ; segment length |
||
668 | dest_addr dd 93100000h ; high byte contains access rights |
||
669 | ; three low bytes contains linear address (updated when reading) |
||
670 | dw 0 |
||
671 | times 32 db 0 |
||
672 | |||
673 | find_error_si: |
||
674 | push si |
||
675 | find_error_sp: |
||
676 | mov si, error_msg |
||
677 | call out_string |
||
678 | mov si, [cur_obj] |
||
679 | call out_string |
||
680 | mov si, colon |
||
681 | call out_string |
||
682 | pop si |
||
683 | call out_string |
||
684 | jmp $ |
||
685 | |||
686 | file_not_found: |
||
687 | mov si, [esp+2] |
||
688 | mov [cur_obj], si |
||
689 | push notfound_string |
||
690 | jmp find_error_sp |
||
691 | |||
692 | include 'fat32.inc' |
||
693 | include 'ntfs.inc' |
||
694 | |||
695 | write1st: |
||
696 | ; callback from kernel.mnt |
||
697 | ; write first sector of kernel.mnt from 1000:0000 back to disk |
||
698 | push cs |
||
699 | pop ds |
||
700 | push cs |
||
701 | pop es |
||
702 | ; sanity check |
||
703 | mov bx, 500h |
||
704 | mov si, bx |
||
705 | mov cx, 1 |
||
706 | push cx |
||
707 | mov eax, [kernel_mnt_1st] |
||
708 | push eax |
||
709 | call relative_read |
||
710 | push 1000h |
||
711 | pop es |
||
712 | xor di, di |
||
713 | mov cx, 8 |
||
714 | repz cmpsw |
||
715 | mov si, data_error_msg |
||
716 | jnz find_error_si |
||
717 | ; ok, now write back to disk |
||
718 | or byte [read.patch1+2], 1 |
||
719 | or byte [read.patch2+2], 1 |
||
720 | xor bx, bx |
||
721 | pop eax |
||
722 | pop cx |
||
723 | call relative_read |
||
724 | and byte [read.patch1+1], not 1 |
||
725 | and byte [read.patch2+2], not 2 |
||
726 | ; and to image in memory (probably this may be done by kernel.mnt itself?) |
||
727 | mov dword [sou_addr], 93010000h |
||
728 | movzx eax, [kernel_mnt_in_img] |
||
729 | shl eax, 9 |
||
730 | add eax, 93100000h |
||
731 | mov dword [dest_addr], eax |
||
732 | mov si, movedesc |
||
733 | push ds |
||
734 | pop es |
||
735 | mov ah, 87h |
||
736 | mov cx, 100h |
||
737 | int 15h |
||
738 | cmp ah, 0 |
||
739 | mov si, exmem_string |
||
740 | jnz find_error_si |
||
741 | retf |
||
742 | |||
743 | loader_block: |
||
744 | db 1 ; version |
||
745 | dw 1 ; flags - image is loaded |
||
746 | dw write1st ; offset |
||
747 | dw 0 ; segment |
||
748 | |||
749 | fat_cur_sector dd -1 |
||
750 | |||
751 | data_error_msg db 'data error',0 |
||
752 | |||
753 | ; ----------------------------------------------- |
||
754 | ; ------------------ Settings ------------------- |
||
755 | ; ----------------------------------------------- |
||
756 | |||
757 | ; must be in lowercase, see ntfs_parse_dir.scan, fat32_parse_dir.scan |
||
758 | kernel_mnt_name db 'kernel.mnt',0 |
||
759 | |||
760 | ; will be initialized by installer |
||
761 | menuet_img_name rb 300 |
||
762 | |||
763 | ; uninitialized data follows |
||
764 | drive_size dd ? ; in sectors |
||
765 | heads dw ? |
||
766 | sectors dw ? |
||
767 | cyls dw ? |
||
768 | free dw ? |
||
769 | cur_obj dw ? |
||
770 | data_start dd ? |
||
771 | img_data_start dw ? |
||
772 | sect_per_clust dw ? |
||
773 | kernel_mnt_in_img dw ? |
||
774 | kernel_mnt_1st dd ? |
||
775 | ; NTFS data |
||
776 | cluster_size dd ? ; in bytes |
||
777 | frs_size dd ? ; in bytes |
||
778 | frs_sectors dw ? ; in sectors |
||
779 | mft_data_attr dw ? |
||
780 | index_root dw ? |
||
781 | index_alloc dw ? |
||
782 | ofs dw ? |
||
783 | dir dw ? |
||
784 | ; FAT32 data |
||
785 | fat_start dd ? |
||
786 | cur_cluster dd ? |