[57] | 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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[65] | 4 | ; Last update : 3.12.2010 |
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[57] | 5 | ; Author : Tomi Tilli |
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| 6 | ; Description : Functions for managing EEPROM contents. |
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| 7 | |
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[65] | 8 | ; Section containing initialized data |
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| 9 | SECTION .data |
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| 10 | |
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| 11 | ALIGN WORD_ALIGN |
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| 12 | g_rgwEepromTypeToSizeInWords: |
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| 13 | dw (2<<10) / 2 ; EEPROM_TYPE.2816_2kiB |
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| 14 | dw (8<<10) / 2 |
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| 15 | dw (32<<10) / 2 |
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| 16 | dw (64<<10) / 2 |
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| 17 | |
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| 18 | g_rgwEepromPageToSizeInBytes: |
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| 19 | dw 1 ; EEPROM_PAGE.1_byte |
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| 20 | dw 2 |
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| 21 | dw 4 |
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| 22 | dw 8 |
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| 23 | dw 16 |
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| 24 | dw 32 |
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| 25 | dw 64 |
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| 26 | |
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| 27 | |
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| 28 | |
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[57] | 29 | ; Section containing code |
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| 30 | SECTION .text |
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| 31 | |
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| 32 | ;-------------------------------------------------------------------- |
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| 33 | ; EEPROM_LoadXtideUniversalBiosFromRomToRamBuffer |
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| 34 | ; Parameters: |
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| 35 | ; Nothing |
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| 36 | ; Returns: |
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| 37 | ; CX: BIOS size in bytes |
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| 38 | ; Corrupts registers: |
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| 39 | ; AX, BX, SI, DI |
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| 40 | ;-------------------------------------------------------------------- |
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| 41 | ALIGN JUMP_ALIGN |
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| 42 | EEPROM_LoadXtideUniversalBiosFromRomToRamBuffer: |
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| 43 | push es |
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| 44 | |
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| 45 | call EEPROM_FindXtideUniversalBiosROMtoESDI |
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| 46 | call .GetXtideUniversalBiosSizeFromEStoCX |
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| 47 | xor si, si ; Load from beginning of ROM |
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| 48 | call LoadBytesFromRomToRamBuffer |
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| 49 | |
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| 50 | call .GetXtideUniversalBiosSizeFromEStoCX |
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| 51 | pop es |
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| 52 | ret |
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| 53 | |
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| 54 | ;-------------------------------------------------------------------- |
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| 55 | ; .GetXtideUniversalBiosSizeFromEStoCX |
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| 56 | ; Parameters: |
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| 57 | ; Nothing |
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| 58 | ; Returns: |
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| 59 | ; AX: Bios size in bytes |
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| 60 | ; Corrupts registers: |
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| 61 | ; AX, BX |
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| 62 | ;-------------------------------------------------------------------- |
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| 63 | ALIGN JUMP_ALIGN |
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| 64 | .GetXtideUniversalBiosSizeFromEStoCX: |
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| 65 | eMOVZX cx, BYTE [es:ROMVARS.bRomSize] |
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| 66 | eSHL_IM cx, 9 ; *= 512 for byte count |
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| 67 | ret |
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| 68 | |
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| 69 | |
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| 70 | ;-------------------------------------------------------------------- |
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| 71 | ; EEPROM_LoadOldSettingsFromRomToRamBuffer |
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| 72 | ; Parameters: |
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| 73 | ; Nothing |
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| 74 | ; Returns: |
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| 75 | ; CF: Set if EEPROM was found |
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| 76 | ; Cleared if EEPROM not found |
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| 77 | ; Corrupts registers: |
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| 78 | ; AX, BX, CX, SI, DI |
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| 79 | ;-------------------------------------------------------------------- |
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| 80 | ALIGN JUMP_ALIGN |
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| 81 | EEPROM_LoadOldSettingsFromRomToRamBuffer: |
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| 82 | mov cx, ROMVARS_size - ROMVARS.wFlags ; Number of bytes to load |
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| 83 | mov si, ROMVARS.wFlags ; Offset where to start loading |
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| 84 | ; Fall to LoadBytesFromRomToRamBuffer |
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| 85 | |
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| 86 | ;-------------------------------------------------------------------- |
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| 87 | ; LoadBytesFromRomToRamBuffer |
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| 88 | ; Parameters: |
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| 89 | ; CX: Number of bytes to load from ROM |
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| 90 | ; SI: Offset to first byte to load |
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| 91 | ; Returns: |
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| 92 | ; CF: Set if EEPROM was found |
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| 93 | ; Cleared if EEPROM not found |
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| 94 | ; Corrupts registers: |
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| 95 | ; AX, BX, CX, SI, DI |
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| 96 | ;-------------------------------------------------------------------- |
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| 97 | ALIGN JUMP_ALIGN |
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| 98 | LoadBytesFromRomToRamBuffer: |
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| 99 | push es |
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| 100 | push ds |
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| 101 | |
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| 102 | call EEPROM_FindXtideUniversalBiosROMtoESDI |
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| 103 | jnc SHORT .XtideUniversalBiosNotFound |
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| 104 | push es |
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| 105 | pop ds ; DS:SI points to ROM |
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| 106 | |
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| 107 | call Buffers_GetFileBufferToESDI |
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| 108 | mov di, si ; ES:DI points to RAM buffer |
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| 109 | |
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| 110 | cld |
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| 111 | call Memory_CopyCXbytesFromDSSItoESDI |
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| 112 | stc |
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| 113 | |
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| 114 | .XtideUniversalBiosNotFound: |
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| 115 | pop ds |
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| 116 | pop es |
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| 117 | ret |
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| 118 | |
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| 119 | |
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| 120 | ;-------------------------------------------------------------------- |
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| 121 | ; EEPROM_FindXtideUniversalBiosROMtoESDI |
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| 122 | ; Parameters: |
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| 123 | ; Nothing |
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| 124 | ; Returns: |
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| 125 | ; ES:DI: EEPROM segment |
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| 126 | ; CF: Set if EEPROM was found |
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| 127 | ; Cleared if EEPROM not found |
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| 128 | ; Corrupts registers: |
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| 129 | ; AX, BX |
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| 130 | ;-------------------------------------------------------------------- |
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| 131 | ALIGN JUMP_ALIGN |
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| 132 | EEPROM_FindXtideUniversalBiosROMtoESDI: |
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| 133 | push si |
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| 134 | push cx |
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| 135 | |
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| 136 | xor di, di ; Zero DI (offset) |
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| 137 | mov bx, 0C000h ; First possible ROM segment |
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| 138 | ALIGN JUMP_ALIGN |
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| 139 | .SegmentLoop: |
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| 140 | mov es, bx ; Possible ROM segment to ES |
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| 141 | call Buffers_IsXtideUniversalBiosSignatureInESDI |
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| 142 | je SHORT .RomFound |
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| 143 | add bx, 200h ; Increment by 8kB |
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| 144 | jnc SHORT .SegmentLoop ; Loop until segment overflows |
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| 145 | clc |
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| 146 | jmp SHORT .ReturnWithoutUpdatingCF |
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| 147 | ALIGN JUMP_ALIGN |
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| 148 | .RomFound: |
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| 149 | stc |
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| 150 | .ReturnWithoutUpdatingCF: |
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| 151 | pop cx |
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| 152 | pop si |
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| 153 | ret |
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| 154 | |
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| 155 | |
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| 156 | ;-------------------------------------------------------------------- |
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[65] | 157 | ; EEPROM_LoadFromRomToRamComparisonBuffer |
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[57] | 158 | ; Parameters: |
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| 159 | ; Nothing |
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| 160 | ; Returns: |
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[65] | 161 | ; Nothing |
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[57] | 162 | ; Corrupts registers: |
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[65] | 163 | ; BX, CX, SI, DI |
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[57] | 164 | ;-------------------------------------------------------------------- |
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| 165 | ALIGN JUMP_ALIGN |
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[65] | 166 | EEPROM_LoadFromRomToRamComparisonBuffer: |
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| 167 | push es |
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| 168 | push ds |
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| 169 | |
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| 170 | mov ds, [cs:g_cfgVars+CFGVARS.wEepromSegment] |
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| 171 | xor si, si |
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| 172 | call Buffers_GetFlashComparisonBufferToESDI |
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| 173 | eMOVZX bx, BYTE [cs:g_cfgVars+CFGVARS.bEepromType] |
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| 174 | mov cx, [cs:bx+g_rgwEepromTypeToSizeInWords] |
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| 175 | cld |
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| 176 | rep movsw |
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| 177 | |
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| 178 | pop ds |
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| 179 | pop es |
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[57] | 180 | ret |
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