1 | ; File name : EEPROM.asm |
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2 | ; Project name : XTIDE Univeral BIOS Configurator v2 |
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3 | ; Created date : 19.4.2010 |
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4 | ; Last update : 10.10.2010 |
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5 | ; Author : Tomi Tilli |
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6 | ; Description : Functions for managing EEPROM contents. |
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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 | ; EEPROM_LoadXtideUniversalBiosFromRomToRamBuffer |
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13 | ; Parameters: |
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14 | ; Nothing |
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15 | ; Returns: |
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16 | ; CX: BIOS size in bytes |
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17 | ; Corrupts registers: |
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18 | ; AX, BX, SI, DI |
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19 | ;-------------------------------------------------------------------- |
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20 | ALIGN JUMP_ALIGN |
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21 | EEPROM_LoadXtideUniversalBiosFromRomToRamBuffer: |
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22 | push es |
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23 | |
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24 | call EEPROM_FindXtideUniversalBiosROMtoESDI |
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25 | call .GetXtideUniversalBiosSizeFromEStoCX |
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26 | xor si, si ; Load from beginning of ROM |
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27 | call LoadBytesFromRomToRamBuffer |
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28 | |
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29 | call .GetXtideUniversalBiosSizeFromEStoCX |
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30 | pop es |
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31 | ret |
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32 | |
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33 | ;-------------------------------------------------------------------- |
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34 | ; .GetXtideUniversalBiosSizeFromEStoCX |
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35 | ; Parameters: |
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36 | ; Nothing |
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37 | ; Returns: |
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38 | ; AX: Bios size in bytes |
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39 | ; Corrupts registers: |
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40 | ; AX, BX |
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41 | ;-------------------------------------------------------------------- |
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42 | ALIGN JUMP_ALIGN |
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43 | .GetXtideUniversalBiosSizeFromEStoCX: |
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44 | eMOVZX cx, BYTE [es:ROMVARS.bRomSize] |
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45 | eSHL_IM cx, 9 ; *= 512 for byte count |
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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 | ; EEPROM_LoadOldSettingsFromRomToRamBuffer |
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51 | ; Parameters: |
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52 | ; Nothing |
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53 | ; Returns: |
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54 | ; CF: Set if EEPROM was found |
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55 | ; Cleared if EEPROM not found |
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56 | ; Corrupts registers: |
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57 | ; AX, BX, CX, SI, DI |
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58 | ;-------------------------------------------------------------------- |
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59 | ALIGN JUMP_ALIGN |
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60 | EEPROM_LoadOldSettingsFromRomToRamBuffer: |
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61 | mov cx, ROMVARS_size - ROMVARS.wFlags ; Number of bytes to load |
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62 | mov si, ROMVARS.wFlags ; Offset where to start loading |
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63 | ; Fall to LoadBytesFromRomToRamBuffer |
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64 | |
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65 | ;-------------------------------------------------------------------- |
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66 | ; LoadBytesFromRomToRamBuffer |
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67 | ; Parameters: |
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68 | ; CX: Number of bytes to load from ROM |
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69 | ; SI: Offset to first byte to load |
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70 | ; Returns: |
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71 | ; CF: Set if EEPROM was found |
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72 | ; Cleared if EEPROM not found |
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73 | ; Corrupts registers: |
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74 | ; AX, BX, CX, SI, DI |
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75 | ;-------------------------------------------------------------------- |
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76 | ALIGN JUMP_ALIGN |
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77 | LoadBytesFromRomToRamBuffer: |
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78 | push es |
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79 | push ds |
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80 | |
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81 | call EEPROM_FindXtideUniversalBiosROMtoESDI |
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82 | jnc SHORT .XtideUniversalBiosNotFound |
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83 | push es |
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84 | pop ds ; DS:SI points to ROM |
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85 | |
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86 | call Buffers_GetFileBufferToESDI |
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87 | mov di, si ; ES:DI points to RAM buffer |
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88 | |
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89 | cld |
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90 | call Memory_CopyCXbytesFromDSSItoESDI |
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91 | stc |
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92 | |
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93 | .XtideUniversalBiosNotFound: |
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94 | pop ds |
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95 | pop es |
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96 | ret |
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97 | |
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98 | |
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99 | ;-------------------------------------------------------------------- |
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100 | ; EEPROM_FindXtideUniversalBiosROMtoESDI |
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101 | ; Parameters: |
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102 | ; Nothing |
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103 | ; Returns: |
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104 | ; ES:DI: EEPROM segment |
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105 | ; CF: Set if EEPROM was found |
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106 | ; Cleared if EEPROM not found |
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107 | ; Corrupts registers: |
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108 | ; AX, BX |
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109 | ;-------------------------------------------------------------------- |
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110 | ALIGN JUMP_ALIGN |
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111 | EEPROM_FindXtideUniversalBiosROMtoESDI: |
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112 | push si |
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113 | push cx |
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114 | |
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115 | xor di, di ; Zero DI (offset) |
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116 | mov bx, 0C000h ; First possible ROM segment |
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117 | ALIGN JUMP_ALIGN |
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118 | .SegmentLoop: |
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119 | mov es, bx ; Possible ROM segment to ES |
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120 | call Buffers_IsXtideUniversalBiosSignatureInESDI |
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121 | je SHORT .RomFound |
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122 | add bx, 200h ; Increment by 8kB |
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123 | jnc SHORT .SegmentLoop ; Loop until segment overflows |
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124 | clc |
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125 | jmp SHORT .ReturnWithoutUpdatingCF |
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126 | ALIGN JUMP_ALIGN |
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127 | .RomFound: |
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128 | stc |
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129 | .ReturnWithoutUpdatingCF: |
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130 | pop cx |
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131 | pop si |
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132 | ret |
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133 | |
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134 | |
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135 | ;-------------------------------------------------------------------- |
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136 | ; EEPROM_GetPointerForFlashingToESDI |
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137 | ; Parameters: |
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138 | ; Nothing |
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139 | ; Returns: |
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140 | ; ES:DI: Ptr to EEPROM to be flashed |
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141 | ; Corrupts registers: |
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142 | ; Nothing |
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143 | ;-------------------------------------------------------------------- |
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144 | ALIGN JUMP_ALIGN |
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145 | EEPROM_GetPointerForFlashingToESDI: |
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146 | mov es, [cs:g_cfgVars+CFGVARS.wEepromSegment] |
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147 | xor di, di |
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148 | ret |
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