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Rev | Author | Line No. | Line |
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2288 | clevermous | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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5363 | yogev_ezra | 3 | ;; Copyright (C) KolibriOS team 2004-2015. All rights reserved. ;; |
2288 | clevermous | 4 | ;; Distributed under terms of the GNU General Public License ;; |
5 | ;; ;; |
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6 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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7 | |||
8 | $Revision: 6016 $ |
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9 | |||
5569 | Pathoswith | 10 | ; Disk access through BIOS |
3742 | clevermous | 11 | iglobal |
2288 | clevermous | 12 | align 4 |
3742 | clevermous | 13 | bd_callbacks: |
5569 | Pathoswith | 14 | dd bd_callbacks.end - bd_callbacks ; strucsize |
15 | dd 0 ; no close function |
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16 | dd 0 ; no closemedia function |
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3742 | clevermous | 17 | dd bd_querymedia |
18 | dd bd_read_interface |
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19 | dd bd_write_interface |
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5569 | Pathoswith | 20 | dd 0 ; no flush function |
21 | dd 0 ; use default cache size |
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3742 | clevermous | 22 | .end: |
23 | endg |
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2288 | clevermous | 24 | |
5569 | Pathoswith | 25 | uglobal |
26 | bios_hdpos dd 0 |
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27 | bios_cur_sector dd ? |
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28 | bios_read_len dd ? |
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29 | cache_chain_ptr dd ? |
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30 | int13_regs_in rb sizeof.v86_regs |
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31 | int13_regs_out rb sizeof.v86_regs |
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32 | cache_chain_size db ? |
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33 | endg |
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34 | ;----------------------------------------------------------------- |
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3742 | clevermous | 35 | proc bd_read_interface stdcall uses edi, \ |
36 | userdata, buffer, startsector:qword, numsectors |
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37 | ; userdata = old [hdpos] = 80h + index in NumBiosDisks |
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38 | ; buffer = pointer to buffer for data |
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39 | ; startsector = 64-bit start sector |
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40 | ; numsectors = pointer to number of sectors on input, |
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41 | ; must be filled with number of sectors really read |
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42 | locals |
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43 | sectors_todo dd ? |
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44 | endl |
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45 | ; 1. Initialize number of sectors: get number of requested sectors |
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46 | ; and say that no sectors were read yet. |
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47 | mov ecx, [numsectors] |
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48 | mov eax, [ecx] |
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49 | mov dword [ecx], 0 |
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50 | mov [sectors_todo], eax |
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51 | ; 2. Acquire the global lock. |
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52 | mov ecx, ide_mutex |
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53 | call mutex_lock |
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54 | ; 3. Convert parameters to the form suitable for worker procedures. |
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55 | ; Underlying procedures do not know about 64-bit sectors. |
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56 | ; Worker procedures use global variables and edi for [buffer]. |
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57 | cmp dword [startsector+4], 0 |
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58 | jnz .fail |
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59 | and [hd_error], 0 |
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60 | mov eax, [userdata] |
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61 | mov [hdpos], eax |
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62 | mov eax, dword [startsector] |
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63 | mov edi, [buffer] |
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64 | ; 4. Worker procedures take one sectors per time, so loop over all sectors to read. |
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65 | .sectors_loop: |
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66 | call bd_read |
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67 | cmp [hd_error], 0 |
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68 | jnz .fail |
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69 | mov ecx, [numsectors] |
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70 | inc dword [ecx] ; one more sector is read |
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71 | dec [sectors_todo] |
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72 | jz .done |
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73 | inc eax |
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74 | jnz .sectors_loop |
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75 | ; 5. Loop is done, either due to error or because everything is done. |
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76 | ; Release the global lock and return the corresponding status. |
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77 | .fail: |
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78 | mov ecx, ide_mutex |
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79 | call mutex_unlock |
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80 | or eax, -1 |
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81 | ret |
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82 | .done: |
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83 | mov ecx, ide_mutex |
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84 | call mutex_unlock |
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85 | xor eax, eax |
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86 | ret |
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87 | endp |
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5569 | Pathoswith | 88 | ;----------------------------------------------------------------- |
3742 | clevermous | 89 | proc bd_write_interface stdcall uses esi edi, \ |
90 | userdata, buffer, startsector:qword, numsectors |
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91 | ; userdata = old [hdpos] = 80h + index in NumBiosDisks |
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92 | ; buffer = pointer to buffer with data |
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93 | ; startsector = 64-bit start sector |
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94 | ; numsectors = pointer to number of sectors on input, |
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95 | ; must be filled with number of sectors really written |
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96 | locals |
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97 | sectors_todo dd ? |
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98 | endl |
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99 | ; 1. Initialize number of sectors: get number of requested sectors |
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100 | ; and say that no sectors were read yet. |
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101 | mov ecx, [numsectors] |
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102 | mov eax, [ecx] |
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103 | mov dword [ecx], 0 |
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104 | mov [sectors_todo], eax |
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105 | ; 2. Acquire the global lock. |
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106 | mov ecx, ide_mutex |
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107 | call mutex_lock |
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108 | ; 3. Convert parameters to the form suitable for worker procedures. |
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109 | ; Underlying procedures do not know about 64-bit sectors. |
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110 | ; Worker procedures use global variables and esi for [buffer]. |
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111 | cmp dword [startsector+4], 0 |
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112 | jnz .fail |
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113 | and [hd_error], 0 |
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114 | mov eax, [userdata] |
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115 | mov [hdpos], eax |
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116 | mov esi, [buffer] |
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117 | lea edi, [startsector] |
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118 | mov [cache_chain_ptr], edi |
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119 | ; 4. Worker procedures take max 16 sectors per time, |
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120 | ; loop until all sectors will be processed. |
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121 | .sectors_loop: |
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122 | mov ecx, 16 |
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123 | cmp ecx, [sectors_todo] |
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124 | jbe @f |
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125 | mov ecx, [sectors_todo] |
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126 | @@: |
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127 | mov [cache_chain_size], cl |
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128 | call bd_write_cache_chain |
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129 | cmp [hd_error], 0 |
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130 | jnz .fail |
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131 | movzx ecx, [cache_chain_size] |
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132 | mov eax, [numsectors] |
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133 | add [eax], ecx |
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134 | sub [sectors_todo], ecx |
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135 | jz .done |
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136 | add [edi], ecx |
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137 | jc .fail |
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138 | shl ecx, 9 |
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139 | add esi, ecx |
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140 | jmp .sectors_loop |
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141 | ; 5. Loop is done, either due to error or because everything is done. |
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142 | ; Release the global lock and return the corresponding status. |
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143 | .fail: |
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144 | mov ecx, ide_mutex |
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145 | call mutex_unlock |
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146 | or eax, -1 |
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147 | ret |
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148 | .done: |
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149 | mov ecx, ide_mutex |
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150 | call mutex_unlock |
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151 | xor eax, eax |
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152 | ret |
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153 | endp |
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5569 | Pathoswith | 154 | ;----------------------------------------------------------------- |
3742 | clevermous | 155 | ; This is a stub. |
156 | proc bd_querymedia stdcall, hd_data, mediainfo |
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157 | mov eax, [mediainfo] |
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158 | mov [eax+DISKMEDIAINFO.Flags], 0 |
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159 | mov [eax+DISKMEDIAINFO.SectorSize], 512 |
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160 | or dword [eax+DISKMEDIAINFO.Capacity], 0xFFFFFFFF |
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161 | or dword [eax+DISKMEDIAINFO.Capacity+4], 0xFFFFFFFF |
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162 | xor eax, eax |
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163 | ret |
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164 | endp |
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5569 | Pathoswith | 165 | ;----------------------------------------------------------------- |
2288 | clevermous | 166 | bd_read: |
167 | push eax |
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168 | push edx |
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169 | mov edx, [bios_hdpos] |
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170 | cmp edx, [hdpos] |
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171 | jne .notread |
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172 | mov edx, [bios_cur_sector] |
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173 | cmp eax, edx |
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174 | jb .notread |
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175 | add edx, [bios_read_len] |
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176 | dec edx |
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177 | cmp eax, edx |
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178 | ja .notread |
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179 | sub eax, [bios_cur_sector] |
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180 | shl eax, 9 |
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6016 | clevermous | 181 | add eax, (OS_BASE+0x99000) |
3742 | clevermous | 182 | push ecx esi |
2288 | clevermous | 183 | mov esi, eax |
184 | mov ecx, 512/4 |
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185 | cld |
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186 | rep movsd |
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3742 | clevermous | 187 | pop esi ecx |
2288 | clevermous | 188 | pop edx |
189 | pop eax |
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190 | ret |
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191 | .notread: |
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192 | push ecx |
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193 | mov dl, 42h |
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194 | mov ecx, 16 |
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195 | call int13_call |
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196 | pop ecx |
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197 | test eax, eax |
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198 | jnz .v86err |
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199 | test edx, edx |
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200 | jz .readerr |
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201 | mov [bios_read_len], edx |
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202 | mov edx, [hdpos] |
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203 | mov [bios_hdpos], edx |
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204 | pop edx |
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205 | pop eax |
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206 | mov [bios_cur_sector], eax |
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207 | jmp bd_read |
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208 | .readerr: |
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209 | .v86err: |
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6014 | clevermous | 210 | pop edx |
211 | pop eax |
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2288 | clevermous | 212 | mov [hd_error], 1 |
213 | jmp hd_read_error |
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5569 | Pathoswith | 214 | ;----------------------------------------------------------------- |
2288 | clevermous | 215 | bd_write_cache_chain: |
216 | pusha |
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6016 | clevermous | 217 | mov edi, OS_BASE + 0x99000 |
2288 | clevermous | 218 | movzx ecx, [cache_chain_size] |
219 | push ecx |
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220 | shl ecx, 9-2 |
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221 | rep movsd |
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222 | pop ecx |
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223 | mov dl, 43h |
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224 | mov eax, [cache_chain_ptr] |
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225 | mov eax, [eax] |
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226 | call int13_call |
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227 | test eax, eax |
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228 | jnz .v86err |
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229 | cmp edx, ecx |
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230 | jnz .writeerr |
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231 | popa |
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232 | ret |
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233 | .v86err: |
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234 | .writeerr: |
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235 | popa |
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236 | mov [hd_error], 1 |
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237 | jmp hd_write_error |
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5569 | Pathoswith | 238 | ;----------------------------------------------------------------- |
2288 | clevermous | 239 | int13_call: |
240 | ; Because this code uses fixed addresses, |
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241 | ; it can not be run simultaniously by many threads. |
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3742 | clevermous | 242 | ; In current implementation it is protected by common mutex 'ide_status' |
5569 | Pathoswith | 243 | mov word [OS_BASE + 510h], 10h ; packet length |
244 | mov word [OS_BASE + 512h], cx ; number of sectors |
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6016 | clevermous | 245 | mov dword [OS_BASE + 514h], 99000000h ; buffer 9900:0000 |
2288 | clevermous | 246 | mov dword [OS_BASE + 518h], eax |
247 | and dword [OS_BASE + 51Ch], 0 |
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248 | push ebx ecx esi edi |
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249 | mov ebx, int13_regs_in |
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250 | mov edi, ebx |
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2384 | hidnplayr | 251 | mov ecx, sizeof.v86_regs/4 |
2288 | clevermous | 252 | xor eax, eax |
253 | rep stosd |
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254 | mov byte [ebx+v86_regs.eax+1], dl |
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255 | mov eax, [hdpos] |
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256 | lea eax, [BiosDisksData+(eax-80h)*4] |
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257 | mov dl, [eax] |
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258 | mov byte [ebx+v86_regs.edx], dl |
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259 | movzx edx, byte [eax+1] |
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260 | ; mov dl, 5 |
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261 | test edx, edx |
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262 | jnz .hasirq |
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263 | dec edx |
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264 | jmp @f |
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265 | .hasirq: |
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266 | pushad |
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267 | stdcall enable_irq, edx |
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268 | popad |
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269 | @@: |
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270 | mov word [ebx+v86_regs.esi], 510h |
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271 | mov word [ebx+v86_regs.ss], 9000h |
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6016 | clevermous | 272 | mov word [ebx+v86_regs.esp], 09000h |
2288 | clevermous | 273 | mov word [ebx+v86_regs.eip], 500h |
274 | mov [ebx+v86_regs.eflags], 20200h |
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275 | mov esi, [sys_v86_machine] |
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276 | mov ecx, 0x502 |
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277 | push fs |
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278 | call v86_start |
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279 | pop fs |
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280 | and [bios_hdpos], 0 |
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281 | pop edi esi ecx ebx |
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282 | movzx edx, byte [OS_BASE + 512h] |
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283 | test byte [int13_regs_out+v86_regs.eflags], 1 |
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284 | jnz @f |
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285 | mov edx, ecx |
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286 | @@: |
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287 | ret |