[57] | 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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[65] | 4 | ; Section containing initialized data
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| 5 | SECTION .data
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| 6 |
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| 7 | ALIGN WORD_ALIGN
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| 8 | g_rgwEepromTypeToSizeInWords:
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| 9 | dw (2<<10) / 2 ; EEPROM_TYPE.2816_2kiB
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| 10 | dw (8<<10) / 2
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[159] | 11 | dw (8<<10) / 2 ; EEPROM_TYPE.2864_8kiB_MOD
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[65] | 12 | dw (32<<10) / 2
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| 13 | dw (64<<10) / 2
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| 14 |
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| 15 | g_rgwEepromPageToSizeInBytes:
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| 16 | dw 1 ; EEPROM_PAGE.1_byte
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| 17 | dw 2
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| 18 | dw 4
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| 19 | dw 8
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| 20 | dw 16
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| 21 | dw 32
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| 22 | dw 64
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| 23 |
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| 24 |
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| 25 |
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[57] | 26 | ; Section containing code
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| 27 | SECTION .text
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| 28 |
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| 29 | ;--------------------------------------------------------------------
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[118] | 30 | ; EEPROM_GetSmallestEepromSizeInWordsToCXforImageWithWordSizeInAX
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| 31 | ; Parameters:
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| 32 | ; AX: Image size in WORDs
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| 33 | ; Returns:
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| 34 | ; CX: Required EEPROM size in WORDs
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| 35 | ; CF: Set if EEPROM size found
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| 36 | ; Cleared if no valid EEPROM found
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| 37 | ; Corrupts registers:
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| 38 | ; BX
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| 39 | ;--------------------------------------------------------------------
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| 40 | ALIGN JUMP_ALIGN
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| 41 | EEPROM_GetSmallestEepromSizeInWordsToCXforImageWithWordSizeInAX:
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| 42 | mov bx, g_rgwEepromTypeToSizeInWords
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| 43 | mov cx, NUMBER_OF_EEPROM_TYPES
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| 44 | ALIGN JUMP_ALIGN
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| 45 | .CheckNextEepromSize:
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| 46 | cmp ax, [cs:bx]
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[138] | 47 | jbe SHORT .ReturnEepromSizeInCX
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[118] | 48 | inc bx
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| 49 | inc bx
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| 50 | loop .CheckNextEepromSize
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[145] | 51 | ret ; Return with CF cleared (none of the supported EEPROMs are large enough)
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[118] | 52 | ALIGN JUMP_ALIGN
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[138] | 53 | .ReturnEepromSizeInCX:
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[118] | 54 | mov cx, [cs:bx]
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| 55 | stc
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| 56 | ret
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| 57 |
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| 58 |
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| 59 | ;--------------------------------------------------------------------
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[68] | 60 | ; EEPROM_LoadXtideUniversalBiosFromRomToRamBufferAndReturnSizeInDXCX
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[57] | 61 | ; Parameters:
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| 62 | ; Nothing
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| 63 | ; Returns:
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[68] | 64 | ; DX:CX: BIOS size in bytes
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[57] | 65 | ; Corrupts registers:
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| 66 | ; AX, BX, SI, DI
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| 67 | ;--------------------------------------------------------------------
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| 68 | ALIGN JUMP_ALIGN
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[68] | 69 | EEPROM_LoadXtideUniversalBiosFromRomToRamBufferAndReturnSizeInDXCX:
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[57] | 70 | push es
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| 71 |
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| 72 | call EEPROM_FindXtideUniversalBiosROMtoESDI
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[68] | 73 | call .GetXtideUniversalBiosSizeFromEStoDXCX
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[57] | 74 | xor si, si ; Load from beginning of ROM
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| 75 | call LoadBytesFromRomToRamBuffer
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| 76 |
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[68] | 77 | call .GetXtideUniversalBiosSizeFromEStoDXCX
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[57] | 78 | pop es
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| 79 | ret
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| 80 |
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| 81 | ;--------------------------------------------------------------------
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[68] | 82 | ; .GetXtideUniversalBiosSizeFromEStoDXCX
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[57] | 83 | ; Parameters:
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| 84 | ; Nothing
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| 85 | ; Returns:
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[68] | 86 | ; DX:CX: Bios size in bytes
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[57] | 87 | ; Corrupts registers:
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[68] | 88 | ; Nothing
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[57] | 89 | ;--------------------------------------------------------------------
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| 90 | ALIGN JUMP_ALIGN
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[68] | 91 | .GetXtideUniversalBiosSizeFromEStoDXCX:
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| 92 | xor dx, dx
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[293] | 93 | eMOVZX cx, [es:ROMVARS.bRomSize]
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[57] | 94 | eSHL_IM cx, 9 ; *= 512 for byte count
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| 95 | ret
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| 96 |
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| 97 |
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| 98 | ;--------------------------------------------------------------------
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| 99 | ; EEPROM_LoadOldSettingsFromRomToRamBuffer
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| 100 | ; Parameters:
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| 101 | ; Nothing
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| 102 | ; Returns:
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| 103 | ; CF: Set if EEPROM was found
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| 104 | ; Cleared if EEPROM not found
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| 105 | ; Corrupts registers:
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| 106 | ; AX, BX, CX, SI, DI
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| 107 | ;--------------------------------------------------------------------
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| 108 | ALIGN JUMP_ALIGN
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| 109 | EEPROM_LoadOldSettingsFromRomToRamBuffer:
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| 110 | mov cx, ROMVARS_size - ROMVARS.wFlags ; Number of bytes to load
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| 111 | mov si, ROMVARS.wFlags ; Offset where to start loading
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| 112 | ; Fall to LoadBytesFromRomToRamBuffer
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| 113 |
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| 114 | ;--------------------------------------------------------------------
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| 115 | ; LoadBytesFromRomToRamBuffer
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| 116 | ; Parameters:
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| 117 | ; CX: Number of bytes to load from ROM
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| 118 | ; SI: Offset to first byte to load
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| 119 | ; Returns:
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| 120 | ; CF: Set if EEPROM was found
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| 121 | ; Cleared if EEPROM not found
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| 122 | ; Corrupts registers:
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| 123 | ; AX, BX, CX, SI, DI
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| 124 | ;--------------------------------------------------------------------
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| 125 | ALIGN JUMP_ALIGN
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| 126 | LoadBytesFromRomToRamBuffer:
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| 127 | push es
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| 128 | push ds
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| 129 |
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| 130 | call EEPROM_FindXtideUniversalBiosROMtoESDI
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| 131 | jnc SHORT .XtideUniversalBiosNotFound
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| 132 | push es
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| 133 | pop ds ; DS:SI points to ROM
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| 134 |
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| 135 | call Buffers_GetFileBufferToESDI
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| 136 | mov di, si ; ES:DI points to RAM buffer
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| 137 |
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| 138 | cld
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| 139 | call Memory_CopyCXbytesFromDSSItoESDI
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| 140 | stc
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| 141 |
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| 142 | .XtideUniversalBiosNotFound:
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| 143 | pop ds
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| 144 | pop es
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| 145 | ret
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| 146 |
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| 147 |
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| 148 | ;--------------------------------------------------------------------
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| 149 | ; EEPROM_FindXtideUniversalBiosROMtoESDI
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| 150 | ; Parameters:
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| 151 | ; Nothing
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| 152 | ; Returns:
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| 153 | ; ES:DI: EEPROM segment
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| 154 | ; CF: Set if EEPROM was found
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| 155 | ; Cleared if EEPROM not found
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| 156 | ; Corrupts registers:
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| 157 | ; AX, BX
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| 158 | ;--------------------------------------------------------------------
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| 159 | ALIGN JUMP_ALIGN
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| 160 | EEPROM_FindXtideUniversalBiosROMtoESDI:
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| 161 | push si
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| 162 | push cx
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| 163 |
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| 164 | xor di, di ; Zero DI (offset)
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| 165 | mov bx, 0C000h ; First possible ROM segment
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| 166 | ALIGN JUMP_ALIGN
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| 167 | .SegmentLoop:
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| 168 | mov es, bx ; Possible ROM segment to ES
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| 169 | call Buffers_IsXtideUniversalBiosSignatureInESDI
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| 170 | je SHORT .RomFound
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[181] | 171 | add bh, 2 ; Increment by 8kB
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[57] | 172 | jnc SHORT .SegmentLoop ; Loop until segment overflows
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| 173 | clc
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| 174 | jmp SHORT .ReturnWithoutUpdatingCF
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| 175 | ALIGN JUMP_ALIGN
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| 176 | .RomFound:
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| 177 | stc
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| 178 | .ReturnWithoutUpdatingCF:
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| 179 | pop cx
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| 180 | pop si
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| 181 | ret
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| 182 |
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| 183 |
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| 184 | ;--------------------------------------------------------------------
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[65] | 185 | ; EEPROM_LoadFromRomToRamComparisonBuffer
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[57] | 186 | ; Parameters:
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| 187 | ; Nothing
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| 188 | ; Returns:
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[65] | 189 | ; Nothing
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[57] | 190 | ; Corrupts registers:
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[65] | 191 | ; BX, CX, SI, DI
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[57] | 192 | ;--------------------------------------------------------------------
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| 193 | ALIGN JUMP_ALIGN
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[65] | 194 | EEPROM_LoadFromRomToRamComparisonBuffer:
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| 195 | push es
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| 196 | push ds
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| 197 |
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| 198 | mov ds, [cs:g_cfgVars+CFGVARS.wEepromSegment]
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| 199 | xor si, si
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| 200 | call Buffers_GetFlashComparisonBufferToESDI
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[293] | 201 | eMOVZX bx, [cs:g_cfgVars+CFGVARS.bEepromType]
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[65] | 202 | mov cx, [cs:bx+g_rgwEepromTypeToSizeInWords]
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| 203 | cld
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| 204 | rep movsw
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| 205 |
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| 206 | pop ds
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| 207 | pop es
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[57] | 208 | ret
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