1 | ; Project name : XTIDE Univeral BIOS Configurator v2 |
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2 | ; Description : Functions for managing EEPROM contents. |
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3 | |
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4 | ; |
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5 | ; XTIDE Universal BIOS and Associated Tools |
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6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2012 by XTIDE Universal BIOS Team. |
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7 | ; |
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8 | ; This program is free software; you can redistribute it and/or modify |
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9 | ; it under the terms of the GNU General Public License as published by |
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10 | ; the Free Software Foundation; either version 2 of the License, or |
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11 | ; (at your option) any later version. |
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12 | ; |
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13 | ; This program is distributed in the hope that it will be useful, |
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14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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16 | ; GNU General Public License for more details. |
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17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html |
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18 | ; |
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19 | |
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20 | ; Section containing initialized data |
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21 | SECTION .data |
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22 | |
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23 | ALIGN WORD_ALIGN |
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24 | g_rgwEepromTypeToSizeInWords: |
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25 | dw (2<<10) / 2 ; EEPROM_TYPE.2816_2kiB |
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26 | dw (8<<10) / 2 |
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27 | dw (8<<10) / 2 ; EEPROM_TYPE.2864_8kiB_MOD |
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28 | dw (32<<10) / 2 |
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29 | dw (64<<10) / 2 |
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30 | |
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31 | g_rgwEepromPageToSizeInBytes: |
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32 | dw 1 ; EEPROM_PAGE.1_byte |
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33 | dw 2 |
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34 | dw 4 |
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35 | dw 8 |
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36 | dw 16 |
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37 | dw 32 |
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38 | dw 64 |
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39 | |
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40 | |
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41 | |
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42 | ; Section containing code |
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43 | SECTION .text |
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44 | |
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45 | ;-------------------------------------------------------------------- |
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46 | ; EEPROM_GetSmallestEepromSizeInWordsToCXforImageWithWordSizeInAX |
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47 | ; Parameters: |
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48 | ; AX: Image size in WORDs |
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49 | ; Returns: |
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50 | ; CX: Required EEPROM size in WORDs |
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51 | ; CF: Set if EEPROM size found |
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52 | ; Cleared if no valid EEPROM found |
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53 | ; Corrupts registers: |
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54 | ; BX |
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55 | ;-------------------------------------------------------------------- |
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56 | ALIGN JUMP_ALIGN |
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57 | EEPROM_GetSmallestEepromSizeInWordsToCXforImageWithWordSizeInAX: |
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58 | mov bx, g_rgwEepromTypeToSizeInWords |
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59 | mov cx, NUMBER_OF_EEPROM_TYPES |
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60 | ALIGN JUMP_ALIGN |
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61 | .CheckNextEepromSize: |
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62 | cmp ax, [cs:bx] |
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63 | jbe SHORT .ReturnEepromSizeInCX |
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64 | inc bx |
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65 | inc bx |
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66 | loop .CheckNextEepromSize |
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67 | ret ; Return with CF cleared (none of the supported EEPROMs are large enough) |
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68 | ALIGN JUMP_ALIGN |
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69 | .ReturnEepromSizeInCX: |
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70 | mov cx, [cs:bx] |
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71 | stc |
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72 | ret |
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73 | |
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74 | |
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75 | ;-------------------------------------------------------------------- |
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76 | ; EEPROM_LoadXtideUniversalBiosFromRomToRamBufferAndReturnSizeInDXCX |
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77 | ; Parameters: |
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78 | ; Nothing |
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79 | ; Returns: |
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80 | ; DX:CX: BIOS size in bytes |
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81 | ; Corrupts registers: |
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82 | ; AX, BX, SI, DI |
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83 | ;-------------------------------------------------------------------- |
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84 | ALIGN JUMP_ALIGN |
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85 | EEPROM_LoadXtideUniversalBiosFromRomToRamBufferAndReturnSizeInDXCX: |
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86 | push es |
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87 | |
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88 | call EEPROM_FindXtideUniversalBiosROMtoESDI |
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89 | call .GetXtideUniversalBiosSizeFromEStoDXCX |
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90 | xor si, si ; Load from beginning of ROM |
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91 | call LoadBytesFromRomToRamBuffer |
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92 | |
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93 | call .GetXtideUniversalBiosSizeFromEStoDXCX |
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94 | pop es |
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95 | ret |
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96 | |
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97 | ;-------------------------------------------------------------------- |
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98 | ; .GetXtideUniversalBiosSizeFromEStoDXCX |
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99 | ; Parameters: |
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100 | ; Nothing |
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101 | ; Returns: |
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102 | ; DX:CX: Bios size in bytes |
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103 | ; Corrupts registers: |
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104 | ; Nothing |
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105 | ;-------------------------------------------------------------------- |
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106 | ALIGN JUMP_ALIGN |
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107 | .GetXtideUniversalBiosSizeFromEStoDXCX: |
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108 | xor dx, dx |
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109 | eMOVZX cx, [es:ROMVARS.bRomSize] |
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110 | eSHL_IM cx, 9 ; *= 512 for byte count |
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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 | ; EEPROM_LoadOldSettingsFromRomToRamBuffer |
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116 | ; Parameters: |
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117 | ; Nothing |
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118 | ; Returns: |
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119 | ; CF: Set if EEPROM was found |
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120 | ; Cleared if EEPROM not found |
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121 | ; Corrupts registers: |
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122 | ; AX, BX, CX, SI, DI |
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123 | ;-------------------------------------------------------------------- |
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124 | ALIGN JUMP_ALIGN |
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125 | EEPROM_LoadOldSettingsFromRomToRamBuffer: |
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126 | mov cx, ROMVARS_size - ROMVARS.wFlags ; Number of bytes to load |
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127 | mov si, ROMVARS.wFlags ; Offset where to start loading |
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128 | ; Fall to LoadBytesFromRomToRamBuffer |
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129 | |
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130 | ;-------------------------------------------------------------------- |
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131 | ; LoadBytesFromRomToRamBuffer |
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132 | ; Parameters: |
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133 | ; CX: Number of bytes to load from ROM |
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134 | ; SI: Offset to first byte to load |
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135 | ; Returns: |
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136 | ; CF: Set if EEPROM was found |
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137 | ; Cleared if EEPROM not found |
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138 | ; Corrupts registers: |
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139 | ; AX, BX, CX, SI, DI |
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140 | ;-------------------------------------------------------------------- |
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141 | ALIGN JUMP_ALIGN |
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142 | LoadBytesFromRomToRamBuffer: |
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143 | push es |
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144 | push ds |
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145 | |
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146 | call EEPROM_FindXtideUniversalBiosROMtoESDI |
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147 | jnc SHORT .XtideUniversalBiosNotFound |
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148 | push es |
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149 | pop ds ; DS:SI points to ROM |
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150 | |
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151 | call Buffers_GetFileBufferToESDI |
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152 | mov di, si ; ES:DI points to RAM buffer |
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153 | |
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154 | cld |
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155 | call Memory_CopyCXbytesFromDSSItoESDI |
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156 | stc |
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157 | |
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158 | .XtideUniversalBiosNotFound: |
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159 | pop ds |
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160 | pop es |
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161 | ret |
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162 | |
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163 | |
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164 | ;-------------------------------------------------------------------- |
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165 | ; EEPROM_FindXtideUniversalBiosROMtoESDI |
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166 | ; Parameters: |
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167 | ; Nothing |
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168 | ; Returns: |
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169 | ; ES:DI: EEPROM segment |
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170 | ; CF: Set if EEPROM was found |
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171 | ; Cleared if EEPROM not found |
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172 | ; Corrupts registers: |
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173 | ; AX, BX |
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174 | ;-------------------------------------------------------------------- |
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175 | ALIGN JUMP_ALIGN |
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176 | EEPROM_FindXtideUniversalBiosROMtoESDI: |
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177 | push si |
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178 | push cx |
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179 | |
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180 | xor di, di ; Zero DI (offset) |
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181 | mov bx, 0C000h ; First possible ROM segment |
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182 | ALIGN JUMP_ALIGN |
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183 | .SegmentLoop: |
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184 | mov es, bx ; Possible ROM segment to ES |
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185 | call Buffers_IsXtideUniversalBiosSignatureInESDI |
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186 | je SHORT .RomFound |
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187 | add bh, 2 ; Increment by 8kB |
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188 | jnc SHORT .SegmentLoop ; Loop until segment overflows |
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189 | clc |
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190 | jmp SHORT .ReturnWithoutUpdatingCF |
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191 | ALIGN JUMP_ALIGN |
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192 | .RomFound: |
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193 | stc |
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194 | .ReturnWithoutUpdatingCF: |
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195 | pop cx |
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196 | pop si |
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197 | ret |
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198 | |
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199 | |
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200 | ;-------------------------------------------------------------------- |
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201 | ; EEPROM_LoadFromRomToRamComparisonBuffer |
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202 | ; Parameters: |
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203 | ; Nothing |
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204 | ; Returns: |
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205 | ; Nothing |
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206 | ; Corrupts registers: |
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207 | ; BX, CX, SI, DI |
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208 | ;-------------------------------------------------------------------- |
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209 | ALIGN JUMP_ALIGN |
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210 | EEPROM_LoadFromRomToRamComparisonBuffer: |
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211 | push es |
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212 | push ds |
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213 | |
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214 | mov ds, [cs:g_cfgVars+CFGVARS.wEepromSegment] |
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215 | xor si, si |
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216 | call Buffers_GetFlashComparisonBufferToESDI |
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217 | eMOVZX bx, [cs:g_cfgVars+CFGVARS.bEepromType] |
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218 | mov cx, [cs:bx+g_rgwEepromTypeToSizeInWords] |
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219 | cld |
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220 | rep movsw |
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221 | |
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222 | pop ds |
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223 | pop es |
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224 | ret |
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