[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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| 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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