1 | ; File name : Buffers.asm |
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2 | ; Project name : XTIDE Universal BIOS Configurator v2 |
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3 | ; Created date : 6.10.2010 |
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4 | ; Last update : 6.12.2010 |
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5 | ; Author : Tomi Tilli |
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6 | ; Description : Functions for accessing file and flash buffers. |
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7 | |
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8 | ; Section containing code |
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9 | SECTION .text |
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10 | |
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11 | ;-------------------------------------------------------------------- |
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12 | ; Buffers_Clear |
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13 | ; Parameters: |
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14 | ; Nothing |
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15 | ; Returns: |
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16 | ; Nothing |
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17 | ; Corrupts registers: |
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18 | ; AX, CX, DI, ES |
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19 | ;-------------------------------------------------------------------- |
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20 | ALIGN JUMP_ALIGN |
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21 | Buffers_Clear: |
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22 | call Buffers_GetFileBufferToESDI |
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23 | mov cx, ROMVARS_size |
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24 | jmp Memory_ZeroESDIwithSizeInCX |
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25 | |
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26 | |
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27 | ;-------------------------------------------------------------------- |
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28 | ; Buffers_IsXtideUniversalBiosLoaded |
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29 | ; Parameters: |
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30 | ; Nothing |
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31 | ; Returns: |
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32 | ; ZF: Set if supported version of XTIDE Universal BIOS is loaded |
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33 | ; Cleared no file or some other file is loaded |
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34 | ; Corrupts registers: |
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35 | ; CX, SI, DI, ES |
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36 | ;-------------------------------------------------------------------- |
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37 | ALIGN JUMP_ALIGN |
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38 | Buffers_IsXtideUniversalBiosLoaded: |
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39 | test WORD [cs:g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED |
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40 | jz SHORT .NoFileOrBiosLoaded |
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41 | |
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42 | call Buffers_GetFileBufferToESDI |
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43 | jmp SHORT Buffers_IsXtideUniversalBiosSignatureInESDI |
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44 | .NoFileOrBiosLoaded: |
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45 | or cl, 1 ; Clear ZF |
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46 | ret |
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47 | |
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48 | |
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49 | ;-------------------------------------------------------------------- |
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50 | ; Buffers_IsXtideUniversalBiosSignatureInESDI |
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51 | ; Parameters: |
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52 | ; ES:DI: Ptr to possible XTIDE Universal BIOS location |
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53 | ; Returns: |
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54 | ; ZF: Set if supported version of XTIDE Universal BIOS is loaded |
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55 | ; Cleared no file or some other file is loaded |
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56 | ; Corrupts registers: |
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57 | ; CX, SI |
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58 | ;-------------------------------------------------------------------- |
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59 | ALIGN JUMP_ALIGN |
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60 | Buffers_IsXtideUniversalBiosSignatureInESDI: |
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61 | push di |
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62 | |
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63 | mov si, g_szXtideUniversalBiosSignature |
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64 | add di, BYTE ROMVARS.rgbSign |
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65 | mov cx, XTIDE_SIGNATURE_LENGTH / 2 |
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66 | cld |
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67 | eSEG_STR repe, cs, cmpsw |
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68 | |
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69 | pop di |
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70 | ret |
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71 | |
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72 | |
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73 | ;-------------------------------------------------------------------- |
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74 | ; Buffers_NewBiosWithSizeInCXandSourceInAXhasBeenLoadedForConfiguration |
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75 | ; Parameters: |
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76 | ; AX: EEPROM source (FLG_CFGVARS_FILELOADED or FLG_CFGVARS_ROMLOADED) |
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77 | ; DX:CX: EEPROM size in bytes |
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78 | ; Returns: |
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79 | ; Nothing |
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80 | ; Corrupts registers: |
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81 | ; AX, CX, DX |
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82 | ;-------------------------------------------------------------------- |
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83 | ALIGN JUMP_ALIGN |
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84 | Buffers_NewBiosWithSizeInDXCXandSourceInAXhasBeenLoadedForConfiguration: |
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85 | and WORD [cs:g_cfgVars+CFGVARS.wFlags], ~(FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED | FLG_CFGVARS_UNSAVED) |
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86 | or WORD [cs:g_cfgVars+CFGVARS.wFlags], ax |
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87 | shr dx, 1 |
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88 | rcr cx, 1 |
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89 | mov [cs:g_cfgVars+CFGVARS.wImageSizeInWords], cx |
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90 | ret |
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91 | |
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92 | |
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93 | ;-------------------------------------------------------------------- |
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94 | ; Buffers_SetUnsavedChanges |
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95 | ; Buffers_ClearUnsavedChanges |
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96 | ; Parameters: |
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97 | ; SS:BP: Menu handle |
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98 | ; Returns: |
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99 | ; Nothing |
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100 | ; Corrupts registers: |
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101 | ; Nothing |
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102 | ;-------------------------------------------------------------------- |
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103 | ALIGN JUMP_ALIGN |
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104 | Buffers_SetUnsavedChanges: |
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105 | or WORD [g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_UNSAVED |
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106 | ret |
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107 | |
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108 | ALIGN JUMP_ALIGN |
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109 | Buffers_ClearUnsavedChanges: |
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110 | and WORD [g_cfgVars+CFGVARS.wFlags], ~FLG_CFGVARS_UNSAVED |
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111 | ret |
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112 | |
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113 | |
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114 | ;-------------------------------------------------------------------- |
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115 | ; Buffers_SaveChangesIfFileLoaded |
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116 | ; Parameters: |
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117 | ; Nothing |
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118 | ; Returns: |
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119 | ; Nothing |
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120 | ; Corrupts registers: |
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121 | ; AX, BX, CX, SI, DI |
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122 | ;-------------------------------------------------------------------- |
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123 | ALIGN JUMP_ALIGN |
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124 | Buffers_SaveChangesIfFileLoaded: |
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125 | mov ax, [cs:g_cfgVars+CFGVARS.wFlags] |
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126 | and ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED) |
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127 | cmp ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED) |
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128 | jne SHORT .NothingToSave |
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129 | call Dialogs_DisplaySaveChangesDialog |
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130 | jnz SHORT .NothingToSave |
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131 | jmp BiosFile_SaveUnsavedChanges |
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132 | ALIGN JUMP_ALIGN |
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133 | .NothingToSave: |
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134 | ret |
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135 | |
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136 | |
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137 | ;-------------------------------------------------------------------- |
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138 | ; Buffers_AppendZeroesIfNeeded |
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139 | ; Parameters: |
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140 | ; Nothing |
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141 | ; Returns: |
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142 | ; Nothing |
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143 | ; Corrupts registers: |
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144 | ; AX, CX, DI |
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145 | ;-------------------------------------------------------------------- |
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146 | ALIGN JUMP_ALIGN |
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147 | Buffers_AppendZeroesIfNeeded: |
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148 | push es |
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149 | |
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150 | eMOVZX di, BYTE [cs:g_cfgVars+CFGVARS.bEepromType] |
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151 | mov cx, [cs:di+g_rgwEepromTypeToSizeInWords] |
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152 | sub cx, [cs:g_cfgVars+CFGVARS.wImageSizeInWords] ; CX = WORDs to append |
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153 | jle SHORT .NoNeedToAppendZeroes |
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154 | |
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155 | call Buffers_GetFileBufferToESDI |
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156 | mov ax, [cs:g_cfgVars+CFGVARS.wImageSizeInWords] |
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157 | shl ax, 1 |
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158 | add di, ax ; ES:DI now point first unused image byte |
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159 | xor ax, ax |
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160 | cld |
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161 | rep stosw |
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162 | ALIGN JUMP_ALIGN |
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163 | .NoNeedToAppendZeroes: |
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164 | pop es |
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165 | ret |
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166 | |
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167 | |
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168 | ;-------------------------------------------------------------------- |
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169 | ; Buffers_GenerateChecksum |
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170 | ; Parameters: |
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171 | ; Nothing |
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172 | ; Returns: |
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173 | ; Nothing |
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174 | ; Corrupts registers: |
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175 | ; AX, BX, CX, DI |
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176 | ;-------------------------------------------------------------------- |
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177 | ALIGN JUMP_ALIGN |
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178 | Buffers_GenerateChecksum: |
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179 | push es |
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180 | |
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181 | call Buffers_GetFileBufferToESDI |
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182 | mov cx, [cs:g_cfgVars+CFGVARS.wImageSizeInWords] |
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183 | shl cx, 1 ; Words to bytes |
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184 | dec cx ; Leave space for checksum byte |
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185 | xor ax, ax |
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186 | ALIGN JUMP_ALIGN |
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187 | .SumNextByte: |
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188 | add al, [es:di] |
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189 | inc di |
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190 | loop .SumNextByte |
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191 | neg al |
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192 | mov [es:di], al |
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193 | |
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194 | pop es |
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195 | ret |
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196 | |
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197 | |
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198 | ;-------------------------------------------------------------------- |
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199 | ; Buffers_GetRomvarsFlagsToAX |
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200 | ; Parameters: |
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201 | ; Nothing |
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202 | ; Returns: |
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203 | ; AX: ROMVARS.wFlags |
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204 | ; Corrupts registers: |
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205 | ; BX |
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206 | ;-------------------------------------------------------------------- |
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207 | ALIGN JUMP_ALIGN |
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208 | Buffers_GetRomvarsFlagsToAX: |
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209 | mov bx, ROMVARS.wFlags |
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210 | ; Fall to Buffers_GetRomvarsValueToAXfromOffsetInBX |
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211 | |
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212 | ;-------------------------------------------------------------------- |
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213 | ; Buffers_GetRomvarsValueToAXfromOffsetInBX |
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214 | ; Parameters: |
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215 | ; BX: ROMVARS offset |
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216 | ; Returns: |
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217 | ; AX: Value |
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218 | ; Corrupts registers: |
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219 | ; Nothing |
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220 | ;-------------------------------------------------------------------- |
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221 | ALIGN JUMP_ALIGN |
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222 | Buffers_GetRomvarsValueToAXfromOffsetInBX: |
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223 | push es |
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224 | push di |
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225 | call Buffers_GetFileBufferToESDI |
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226 | mov ax, [es:bx+di] |
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227 | pop di |
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228 | pop es |
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229 | ret |
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230 | |
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231 | |
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232 | ;-------------------------------------------------------------------- |
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233 | ; Buffers_GetFileBufferToESDI |
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234 | ; Buffers_GetFlashComparisonBufferToESDI |
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235 | ; Buffers_GetFileDialogItemBufferToESDI |
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236 | ; Parameters: |
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237 | ; Nothing |
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238 | ; Returns: |
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239 | ; ES:DI: Ptr to file buffer |
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240 | ; Corrupts registers: |
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241 | ; Nothing |
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242 | ;-------------------------------------------------------------------- |
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243 | ALIGN JUMP_ALIGN |
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244 | Buffers_GetFlashComparisonBufferToESDI: |
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245 | Buffers_GetFileDialogItemBufferToESDI: |
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246 | call Buffers_GetFileBufferToESDI |
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247 | push di |
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248 | mov di, es |
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249 | add di, 1000h ; Third 64k page |
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250 | mov es, di |
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251 | pop di |
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252 | ret |
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253 | ALIGN JUMP_ALIGN |
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254 | Buffers_GetFileBufferToESDI: |
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255 | mov di, cs |
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256 | add di, 1000h ; Change to next 64k page |
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257 | mov es, di |
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258 | xor di, di ; Ptr now in ES:DI |
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259 | ret |
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