| [2] | 1 | ; Project name : XTIDE Univeral BIOS Configurator
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| 2 | ; Description : Function for flashing the EEPROM.
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| 3 |
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| 4 | ; Section containing code
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| 5 | SECTION .text
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| 6 |
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| 7 | ;--------------------------------------------------------------------
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| 8 | ; Loads old XTIDE Universal BIOS settings from ROM to RAM.
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| 9 | ;
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| 10 | ; EEPROM_LoadSettingsFromRomToRam
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| 11 | ; Parameters:
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| 12 | ; Nothing
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| 13 | ; Returns:
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| 14 | ; Nothing
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| 15 | ; Corrupts registers:
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| 16 | ; BX, CX, ES
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| 17 | ;--------------------------------------------------------------------
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| 18 | ALIGN JUMP_ALIGN
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| 19 | Flash_CopyCurrentContentsForComparison:
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| 20 | push ds
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| 21 | push di
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| 22 | push si
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| 23 |
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| 24 | call EEPROM_GetComparisonBufferPointerToDSBX
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| 25 | push ds
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| 26 | pop es
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| 27 | mov di, bx ; Comparison buffer now in ES:DI
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| 28 | xor si, si
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| 29 | mov ds, [cs:g_cfgVars+CFGVARS.wEepromSegment] ; EEPROM now in DS:SI
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| 30 | mov cx, [cs:g_cfgVars+CFGVARS.wEepromSize]
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| 31 | shr cx, 1 ; Byte count to word count
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| 32 | cld ; MOVSW to increment DI and SI
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| 33 | rep movsw
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| 34 |
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| 35 | pop si
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| 36 | pop di
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| 37 | pop ds
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| 38 | ret
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| 39 |
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| 40 |
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| 41 | ;--------------------------------------------------------------------
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| 42 | ; Verifies that all data has been written successfully.
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| 43 | ;
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| [293] | 44 | ; Flash_WasDataWriteSuccessful
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| [2] | 45 | ; Parameters:
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| 46 | ; Nothing
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| 47 | ; Returns:
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| 48 | ; ZF: Set if data was written successfully
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| 49 | ; Cleared if write failed
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| 50 | ; Corrupts registers:
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| 51 | ; CX, ES
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| 52 | ;--------------------------------------------------------------------
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| 53 | ALIGN JUMP_ALIGN
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| [293] | 54 | Flash_WasDataWriteSuccessful:
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| [2] | 55 | push ds
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| 56 | push di
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| 57 | push si
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| 58 |
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| 59 | call EEPROM_GetSourceBufferPointerToDSSI
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| 60 | call EEPROM_GetEepromPointerToESDI
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| 61 | mov cx, [cs:g_cfgVars+CFGVARS.wEepromSize]
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| 62 | shr cx, 1 ; Byte count to word count
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| 63 | cld ; CMPSW to increment SI and DI
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| 64 | repe cmpsw
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| 65 |
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| 66 | pop si
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| 67 | pop di
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| 68 | pop ds
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| 69 | ret
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| 70 |
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| 71 |
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| 72 | ;--------------------------------------------------------------------
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| 73 | ; Writes page of data to EEPROM.
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| 74 | ;
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| 75 | ; Flash_WritePage
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| 76 | ; Parameters:
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| 77 | ; AX: SDP command
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| 78 | ; CX: Page size (1, 2, 4, 8, 16, 32 or 64 bytes)
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| 79 | ; DS:BX: Ptr to comparison buffer with old EEPROM data
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| 80 | ; DS:SI: Ptr to source data to write
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| 81 | ; ES:DI: Ptr to destination EEPROM
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| 82 | ; Returns:
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| 83 | ; BX, SI, DI: Updated to next page
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| 84 | ; CF: Cleared if page written successfully
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| 85 | ; Set if polling timeout
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| 86 | ; Corrupts registers:
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| 87 | ; Nothing
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| 88 | ;--------------------------------------------------------------------
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| 89 | ALIGN JUMP_ALIGN
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| 90 | Flash_WritePage:
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| 91 | call Flash_DoesPageNeedToBeWritten
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| 92 | jz SHORT .ReturnWithoutWriting
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| 93 | push bp
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| 94 | push cx
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| 95 | push ax
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| 96 |
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| 97 | mov bp, .LoopWritePageBytes ; Return address from SDP command
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| 98 | cli ; Disable interrupts
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| 99 | jmp SHORT Flash_WriteSdpCommand
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| 100 |
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| 101 | ALIGN JUMP_ALIGN
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| 102 | .LoopWritePageBytes:
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| 103 | lodsb ; Load source byte to AL, increment SI
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| 104 | cmp al, [bx] ; Trying to write existing data?
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| 105 | je SHORT .SkipByte
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| 106 | inc bx ; Increment comparison buffer pointer
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| 107 | mov ah, al ; Last byte written to AH
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| 108 | mov bp, di ; ES:BP points to last byte written
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| 109 | stosb ; Write source byte to EEPROM, increment DI
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| 110 | loop .LoopWritePageBytes
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| 111 | jmp SHORT .PageCompleted
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| 112 | ALIGN JUMP_ALIGN
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| 113 | .SkipByte:
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| 114 | inc bx
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| 115 | inc di
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| 116 | loop .LoopWritePageBytes
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| 117 |
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| 118 | ALIGN JUMP_ALIGN
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| 119 | .PageCompleted:
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| 120 | sti ; Enable interrupts
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| 121 | call Flash_PollEepromUntilWriteCycleHasCompleted
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| 122 | pop ax
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| 123 | pop cx
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| 124 | pop bp
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| 125 | ret
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| 126 |
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| 127 | ALIGN JUMP_ALIGN
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| 128 | .ReturnWithoutWriting:
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| 129 | add bx, cx
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| 130 | add si, cx
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| 131 | add di, cx
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| 132 | clc
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| 133 | ret
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| 134 |
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| 135 | ;--------------------------------------------------------------------
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| 136 | ; Compares source data and comparison buffer.
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| 137 | ;
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| 138 | ; Flash_DoesPageNeedToBeWritten
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| 139 | ; Parameters:
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| 140 | ; CX: Page size (1, 2, 4, 8, 16, 32 or 64 bytes)
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| 141 | ; DS:BX: Ptr to comparison buffer with old EEPROM data
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| 142 | ; DS:SI: Ptr to source data to write
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| 143 | ; Returns:
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| 144 | ; ZF: Set if no need to write page
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| 145 | ; Cleared if writing is needed
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| 146 | ; Corrupts registers:
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| 147 | ; Nothing
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| 148 | ;--------------------------------------------------------------------
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| 149 | ALIGN JUMP_ALIGN
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| 150 | Flash_DoesPageNeedToBeWritten:
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| 151 | push es
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| 152 | push di
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| 153 | push si
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| 154 | push cx
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| 155 |
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| 156 | push ds
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| 157 | pop es
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| 158 | mov di, bx ; ES:DI now points to comparison buffer
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| 159 | cld ; CMPSB to increment SI and DI
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| 160 | repe cmpsb
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| 161 |
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| 162 | pop cx
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| 163 | pop si
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| 164 | pop di
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| 165 | pop es
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| 166 | ret
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| 167 |
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| 168 |
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| 169 | ;--------------------------------------------------------------------
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| 170 | ; Writes Software Data Protection command to EEPROM.
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| 171 | ;
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| 172 | ; Flash_WriteSdpCommand
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| 173 | ; Parameters:
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| 174 | ; AX: SDP command
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| 175 | ; BP: Return address
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| 176 | ; ES: Segment to EEPROM
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| 177 | ; Returns:
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| 178 | ; Nothing
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| 179 | ; Corrupts registers:
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| 180 | ; Nothing
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| 181 | ;--------------------------------------------------------------------
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| 182 | ALIGN JUMP_ALIGN
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| 183 | Flash_WriteSdpCommand:
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| 184 | cmp ax, CMD_SDP_ENABLE
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| 185 | je SHORT Flash_WriteSdpEnableCommand
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| 186 | cmp ax, CMD_SDP_DISABLE
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| 187 | je SHORT Flash_WriteSdpDisableCommand
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| 188 | jmp bp
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| 189 |
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| 190 | ALIGN JUMP_ALIGN
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| 191 | Flash_WriteSdpEnableCommand:
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| 192 | mov BYTE [es:1555h], 0AAh ; Write AAh to address 1555h
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| 193 | mov BYTE [es:0AAAh], 55h ; Write 55h to address 0AAAh
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| 194 | mov BYTE [es:1555h], 0A0h ; Write A0h to address 1555h
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| 195 | jmp bp
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| 196 |
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| 197 | ALIGN JUMP_ALIGN
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| 198 | Flash_WriteSdpDisableCommand:
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| 199 | mov BYTE [es:1555h], 0AAh ; Write AAh to address 1555h
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| 200 | mov BYTE [es:0AAAh], 55h ; Write 55h to address 0AAAh
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| 201 | mov BYTE [es:1555h], 80h ; Write 80h to address 1555h
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| 202 | mov BYTE [es:1555h], 0AAh ; Write AAh to address 1555h
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| 203 | mov BYTE [es:0AAAh], 55h ; Write 55h to address 0AAAh
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| 204 | mov BYTE [es:1555h], 20h ; Write 20h to address 1555h
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| 205 | jmp bp
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| 206 |
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| 207 |
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| 208 | ;--------------------------------------------------------------------
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| 209 | ; Polls EEPROM until write cycle ends.
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| 210 | ;
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| 211 | ; Flash_PollEepromUntilWriteCycleHasCompleted
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| 212 | ; Parameters:
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| 213 | ; AH: Last byte written
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| 214 | ; ES:BP: Ptr to EEPROM last write location
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| 215 | ; Returns:
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| [293] | 216 | ; CF: Cleared if polling successful
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| [2] | 217 | ; Set if polling timeout
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| 218 | ; Corrupts registers:
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| 219 | ; AX, CX
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| 220 | ;--------------------------------------------------------------------
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| 221 | ALIGN JUMP_ALIGN
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| 222 | Flash_PollEepromUntilWriteCycleHasCompleted:
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| 223 | call Flash_InitializePollingTimeout
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| 224 | ALIGN JUMP_ALIGN
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| 225 | .PollLoop:
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| 226 | mov al, [es:bp] ; Load byte from EEPROM
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| 227 | and ax, 8080h ; Clear all but bit 7 from both bytes
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| 228 | cmp al, ah ; Same bytes?
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| 229 | je SHORT .Return
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| 230 | call Flash_UpdatePollingTimeout
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| 231 | jnc SHORT .PollLoop ; Not timeout
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| 232 | ALIGN JUMP_ALIGN
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| 233 | .Return:
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| 234 | ret
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| 235 |
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| 236 | ;--------------------------------------------------------------------
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| 237 | ; Initializes timeout counter. Timeouts are implemented using system
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| 238 | ; timer ticks. First tick might take 0...54.9ms and remaining ticks
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| 239 | ; will occur at 54.9ms intervals. Use delay of two (or more) ticks to
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| 240 | ; ensure at least 54.9ms wait.
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| 241 | ;
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| 242 | ; Flash_InitializePollingTimeout
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| 243 | ; Parameters:
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| 244 | ; Nothing
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| 245 | ; Returns:
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| 246 | ; CX: Timeout end time for Flash_UpdatePollingTimeout
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| 247 | ; Corrupts registers:
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| 248 | ; Nothing
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| 249 | ;--------------------------------------------------------------------
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| 250 | ALIGN JUMP_ALIGN
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| 251 | Flash_InitializePollingTimeout:
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| 252 | push ds
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| 253 | LOAD_BDA_SEGMENT_TO ds, cx
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| 254 | mov cx, CNT_TMEOUT_POLL
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| 255 | add cx, [BDA.dwTimerTicks] ; CX = End time
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| 256 | pop ds
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| 257 | sti ; Enable interrupts
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| 258 | ret
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| 259 |
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| 260 | ;--------------------------------------------------------------------
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| 261 | ; Updates timeout counter. Timeout counter can be
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| 262 | ; initialized with Flash_InitializePollingTimeout.
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| 263 | ;
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| 264 | ; Flash_UpdatePollingTimeout
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| 265 | ; Parameters:
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| 266 | ; CX: Timeout end time
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| 267 | ; Returns:
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| 268 | ; CF: Set if timeout
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| 269 | ; Cleared if time left
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| 270 | ; Corrupts registers:
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| 271 | ; Nothing
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| 272 | ;--------------------------------------------------------------------
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| 273 | ALIGN JUMP_ALIGN
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| 274 | Flash_UpdatePollingTimeout:
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| 275 | push ds
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| 276 | push ax
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| 277 | LOAD_BDA_SEGMENT_TO ds, ax
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| 278 | cmp cx, [BDA.dwTimerTicks] ; Timeout?
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| 279 | pop ax
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| 280 | pop ds
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| 281 | je SHORT .ReturnTimeout
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| 282 | clc
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| 283 | ret
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| 284 | .ReturnTimeout:
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| 285 | stc
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| 286 | ret
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