[2] | 1 | ; File name : EEPROM.asm |
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| 2 | ; Project name : XTIDE Univeral BIOS Configurator |
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| 3 | ; Created date : 19.4.2010 |
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| 4 | ; Last update : 2.5.2010 |
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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 | ; Loads XTIDE Universal BIOS from ROM to RAM to be configured. |
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| 13 | ; |
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| 14 | ; EEPROM_LoadBiosFromROM |
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| 15 | ; Parameters: |
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| 16 | ; Nothing |
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| 17 | ; Returns: |
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| 18 | ; CX: BIOS size in bytes |
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| 19 | ; Corrupts registers: |
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| 20 | ; AX, BX, ES |
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| 21 | ;-------------------------------------------------------------------- |
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| 22 | ALIGN JUMP_ALIGN |
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| 23 | EEPROM_LoadBiosFromROM: |
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| 24 | push si |
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| 25 | call EEPROM_FindXtideUniversalBiosROM |
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| 26 | xor si, si ; Load from beginning of ROM |
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| 27 | eMOVZX cx, BYTE [es:ROMVARS.bRomSize] |
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| 28 | eSHL_IM cx, 9 ; *= 512 for byte count |
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| 29 | call EEPROM_LoadBytesFromROM |
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| 30 | pop si |
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| 31 | ret |
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| 32 | |
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| 33 | |
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| 34 | ;-------------------------------------------------------------------- |
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| 35 | ; Loads old XTIDE Universal BIOS settings from ROM to RAM. |
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| 36 | ; |
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| 37 | ; EEPROM_LoadSettingsFromRomToRam |
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| 38 | ; Parameters: |
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| 39 | ; Nothing |
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| 40 | ; Returns: |
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| 41 | ; Nothing |
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| 42 | ; Corrupts registers: |
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| 43 | ; AX, BX, CX, SI, ES |
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| 44 | ;-------------------------------------------------------------------- |
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| 45 | ALIGN JUMP_ALIGN |
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| 46 | EEPROM_LoadSettingsFromRomToRam: |
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| 47 | mov cx, ROMVARS_size - ROMVARS.wFlags ; Number of bytes to load |
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| 48 | mov si, ROMVARS.wFlags ; Offset where to start loading |
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| 49 | ; Fall to EEPROM_LoadBytesFromROM |
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| 50 | |
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| 51 | ;-------------------------------------------------------------------- |
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| 52 | ; Loads wanted number of bytes from XTIDE Universal BIOS ROM. |
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| 53 | ; |
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| 54 | ; EEPROM_LoadBytesFromROM |
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| 55 | ; Parameters: |
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| 56 | ; CX: Number of bytes to load from beginning of ROM |
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| 57 | ; SI: Offset to first byte |
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| 58 | ; Returns: |
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| 59 | ; Nothing |
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| 60 | ; Corrupts registers: |
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| 61 | ; AX, BX, SI, ES |
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| 62 | ;-------------------------------------------------------------------- |
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| 63 | ALIGN JUMP_ALIGN |
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| 64 | EEPROM_LoadBytesFromROM: |
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| 65 | push ds |
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| 66 | push di |
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| 67 | push cx |
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| 68 | |
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| 69 | call EEPROM_FindXtideUniversalBiosROM |
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| 70 | push es |
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| 71 | pop ds ; DS:SI points to ROM |
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| 72 | push cs |
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| 73 | pop es |
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| 74 | lea di, [si+g_cfgVars+CFGVARS.rgbEepromBuffers] ; ES:DI points to RAM buffer |
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| 75 | shr cx, 1 ; Byte count to word count |
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| 76 | cld ; MOVSW to increment SI and DI |
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| 77 | rep movsw ; Read from ROM to RAM |
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| 78 | |
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| 79 | pop cx |
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| 80 | pop di |
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| 81 | pop ds |
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| 82 | ret |
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| 83 | |
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| 84 | |
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| 85 | ;-------------------------------------------------------------------- |
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| 86 | ; Finds EEPROM using known signature. |
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| 87 | ; |
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| 88 | ; EEPROM_FindXtideUniversalBiosROM |
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| 89 | ; Parameters: |
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| 90 | ; Nothing |
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| 91 | ; Returns: |
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| 92 | ; ES: EEPROM segment |
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| 93 | ; CF: Set if EEPROM was found |
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| 94 | ; Cleared if EEPROM not found |
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| 95 | ; Corrupts registers: |
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| 96 | ; AX, BX |
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| 97 | ;-------------------------------------------------------------------- |
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| 98 | ALIGN JUMP_ALIGN |
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| 99 | EEPROM_FindXtideUniversalBiosROM: |
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| 100 | push di |
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| 101 | xor di, di ; Zero DI |
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| 102 | mov bx, 0C000h ; First possible ROM segment |
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| 103 | ALIGN JUMP_ALIGN |
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| 104 | .SegmentLoop: |
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| 105 | mov es, bx ; Possible ROM segment to ES |
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| 106 | call EEPROM_IsXtideUniversalBiosSignaturePresent |
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| 107 | je SHORT .RomFound |
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| 108 | add bx, 200h ; Increment by 8kB |
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| 109 | jnc SHORT .SegmentLoop ; Loop until segment overflows |
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| 110 | pop di |
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| 111 | clc |
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| 112 | ret |
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| 113 | ALIGN JUMP_ALIGN |
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| 114 | .RomFound: |
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| 115 | pop di |
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| 116 | stc |
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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 | ; Checks if XTIDE Universal BIOS is loaded to be configured. |
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| 122 | ; |
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| 123 | ; EEPROM_IsXtideUniversalBiosLoaded |
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| 124 | ; Parameters: |
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| 125 | ; Nothing |
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| 126 | ; Returns: |
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| 127 | ; ZF: Set if signature found |
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| 128 | ; Cleared if signature not present |
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| 129 | ; Corrupts registers: |
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| 130 | ; AX |
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| 131 | ;-------------------------------------------------------------------- |
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| 132 | ALIGN JUMP_ALIGN |
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| 133 | EEPROM_IsXtideUniversalBiosLoaded: |
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| 134 | push es |
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| 135 | push di |
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| 136 | |
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| 137 | push cs |
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| 138 | pop es |
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| 139 | mov di, g_cfgVars+CFGVARS.rgbEepromBuffers |
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| 140 | call EEPROM_IsXtideUniversalBiosSignaturePresent |
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| 141 | |
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| 142 | pop di |
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| 143 | pop es |
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| 144 | ret |
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| 145 | |
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| 146 | |
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| 147 | ;-------------------------------------------------------------------- |
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| 148 | ; Checks if ROM contains Xtide Universal BIOS signature. |
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| 149 | ; |
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| 150 | ; EEPROM_IsXtideUniversalBiosSignaturePresent |
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| 151 | ; Parameters: |
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| 152 | ; ES:DI: Ptr to ROM contents |
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| 153 | ; Returns: |
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| 154 | ; ZF: Set if signature found |
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| 155 | ; Cleared if signature not present |
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| 156 | ; Corrupts registers: |
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| 157 | ; AX |
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| 158 | ;-------------------------------------------------------------------- |
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| 159 | ALIGN JUMP_ALIGN |
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| 160 | EEPROM_IsXtideUniversalBiosSignaturePresent: |
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| 161 | push ds |
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| 162 | push di |
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| 163 | push si |
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| 164 | push cx |
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| 165 | |
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| 166 | push cs |
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| 167 | pop ds |
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| 168 | mov si, g_szSignature ; DS:SI points to known signature string |
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| 169 | add di, BYTE ROMVARS.rgbSign ; ES:DI points to possible ROM signature |
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| 170 | mov cx, LEN_SIGNATURE/2 ; Signature string length in words |
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| 171 | cld ; CMPSW to increment DI and SI |
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| 172 | repe cmpsw |
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| 173 | |
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| 174 | pop cx |
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| 175 | pop si |
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| 176 | pop di |
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| 177 | pop ds |
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| 178 | ret |
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| 179 | |
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| 180 | |
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| 181 | ;-------------------------------------------------------------------- |
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| 182 | ; Called when new BIOS has been loaded to be flashed. |
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| 183 | ; |
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| 184 | ; EEPROM_NewBiosLoadedFromFileOrROM |
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| 185 | ; Parameters: |
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| 186 | ; AX: EEPROM source (FLG_CFGVARS_FILELOADED or FLG_CFGVARS_ROMLOADED) |
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| 187 | ; CX: EEPROM size in bytes |
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| 188 | ; Returns: |
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| 189 | ; Nothing |
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| 190 | ; Corrupts registers: |
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| 191 | ; Nothing |
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| 192 | ;-------------------------------------------------------------------- |
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| 193 | ALIGN JUMP_ALIGN |
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| 194 | EEPROM_NewBiosLoadedFromFileOrROM: |
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| 195 | and WORD [cs:g_cfgVars+CFGVARS.wFlags], ~(FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED | FLG_CFGVARS_UNSAVED) |
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| 196 | or WORD [cs:g_cfgVars+CFGVARS.wFlags], ax |
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| 197 | mov WORD [cs:g_cfgVars+CFGVARS.wEepromSize], cx |
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| 198 | ret |
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| 199 | |
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| 200 | |
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| 201 | ;-------------------------------------------------------------------- |
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| 202 | ; Generated checksum byte to the end of BIOS image buffer. |
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| 203 | ; |
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| 204 | ; EEPROM_GenerateChecksum |
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| 205 | ; Parameters: |
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| 206 | ; Nothing |
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| 207 | ; Returns: |
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| 208 | ; Nothing |
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| 209 | ; Corrupts registers: |
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| 210 | ; AX, BX, CX |
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| 211 | ;-------------------------------------------------------------------- |
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| 212 | ALIGN JUMP_ALIGN |
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| 213 | EEPROM_GenerateChecksum: |
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| 214 | xor ax, ax |
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| 215 | mov bx, g_cfgVars+CFGVARS.rgbEepromBuffers |
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| 216 | mov cx, [cs:g_cfgVars+CFGVARS.wEepromSize] |
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| 217 | dec cx |
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| 218 | ALIGN JUMP_ALIGN |
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| 219 | .ByteLoop: |
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| 220 | add al, [cs:bx] |
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| 221 | inc bx |
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| 222 | loop .ByteLoop |
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| 223 | neg al |
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| 224 | mov [cs:bx], al |
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| 225 | ret |
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| 226 | |
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| 227 | |
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| 228 | ;-------------------------------------------------------------------- |
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| 229 | ; Returns pointer source data to be flashed to EEPROM. |
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| 230 | ; |
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| 231 | ; EEPROM_GetSourceBufferPointerToDSSI |
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| 232 | ; Parameters: |
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| 233 | ; Nothing |
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| 234 | ; Returns: |
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| 235 | ; DS:SI: Ptr to source buffer |
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| 236 | ; Corrupts registers: |
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| 237 | ; Nothing |
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| 238 | ;-------------------------------------------------------------------- |
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| 239 | ALIGN JUMP_ALIGN |
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| 240 | EEPROM_GetSourceBufferPointerToDSSI: |
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| 241 | push cs |
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| 242 | pop ds |
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| 243 | mov si, g_cfgVars+CFGVARS.rgbEepromBuffers |
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| 244 | ret |
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| 245 | |
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| 246 | |
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| 247 | ;-------------------------------------------------------------------- |
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| 248 | ; Returns pointer to comparison buffer for old EEPROM data. |
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| 249 | ; |
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| 250 | ; EEPROM_GetComparisonBufferPointerToDSBX |
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| 251 | ; Parameters: |
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| 252 | ; Nothing |
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| 253 | ; Returns: |
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| 254 | ; DS:BX: Ptr to verify buffer |
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| 255 | ; Corrupts registers: |
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| 256 | ; Nothing |
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| 257 | ;-------------------------------------------------------------------- |
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| 258 | ALIGN JUMP_ALIGN |
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| 259 | EEPROM_GetComparisonBufferPointerToDSBX: |
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| 260 | push cs |
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| 261 | pop ds |
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| 262 | mov bx, [cs:g_cfgVars+CFGVARS.wEepromSize] |
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| 263 | add bx, g_cfgVars+CFGVARS.rgbEepromBuffers |
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| 264 | ret |
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| 265 | |
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| 266 | |
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| 267 | ;-------------------------------------------------------------------- |
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| 268 | ; Returns pointer to EEPROM where to flash. |
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| 269 | ; |
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| 270 | ; EEPROM_GetEepromPointerToESDI |
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| 271 | ; Parameters: |
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| 272 | ; Nothing |
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| 273 | ; Returns: |
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| 274 | ; ES:DI: Ptr to EEPROM |
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| 275 | ; Corrupts registers: |
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| 276 | ; Nothing |
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| 277 | ;-------------------------------------------------------------------- |
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| 278 | ALIGN JUMP_ALIGN |
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| 279 | EEPROM_GetEepromPointerToESDI: |
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| 280 | mov es, [cs:g_cfgVars+CFGVARS.wEepromSegment] |
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| 281 | xor di, di |
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| 282 | ret |
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