| [2] | 1 | ; File name : EEPROM.asm
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| 2 | ; Project name : XTIDE Univeral BIOS Configurator
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| 3 | ; Created date : 20.4.2010
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| 4 | ; Last update : 21.4.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for loading and saving BIOS image file.
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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 | ; Saves changes to loaded BIOS image file if user wants to do so.
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| 13 | ;
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| 14 | ; BiosFile_SaveUnsavedChanges
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| 15 | ; Parameters:
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| 16 | ; SS:BP: Ptr to MENUVARS
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| 17 | ; Returns:
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| 18 | ; Nothing
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| 19 | ; Corrupts registers:
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| 20 | ; AX, BX, CX, DX, ES
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| 21 | ;--------------------------------------------------------------------
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| 22 | ALIGN JUMP_ALIGN
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| 23 | BiosFile_SaveUnsavedChanges:
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| 24 | push ds
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| 25 | push di
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| 26 | push si
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| 27 |
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| 28 | ; Check if saving is needed
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| 29 | test WORD [cs:g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_UNSAVED
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| 30 | jz SHORT .Return
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| 31 | test WORD [cs:g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_FILELOADED
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| 32 | jz SHORT .Return
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| 33 |
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| 34 | ; Ask if user wants to save
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| 35 | mov ax, cs
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| 36 | mov ds, ax
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| 37 | mov es, ax
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| 38 | call BiosFile_DoesUserWantToSaveChanges
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| 39 | jnc SHORT .Return
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| 40 |
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| 41 | ; Write file
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| 42 | mov si, 80h ; DS:SI points to default DTA (DOS PSP:80h)
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| 43 | mov di, g_cfgVars+CFGVARS.rgbEepromBuffers ; ES:DI points to data to save
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| 44 | call EEPROM_GenerateChecksum
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| 45 | call BiosFile_SaveFile
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| 46 | jc SHORT .Return ; Return if error
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| 47 |
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| 48 | ; Update unsaved status
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| 49 | and WORD [cs:g_cfgVars+CFGVARS.wFlags], ~FLG_CFGVARS_UNSAVED
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| 50 | ALIGN JUMP_ALIGN
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| 51 | .Return:
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| 52 | pop si
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| 53 | pop di
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| 54 | pop ds
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| 55 | ret
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| 56 |
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| 57 | ;--------------------------------------------------------------------
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| 58 | ; Asks does user want to save changes to BIOS image file.
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| 59 | ;
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| 60 | ; BiosFile_DoesUserWantToSaveChanges
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| 61 | ; Parameters:
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| 62 | ; ES: String segment
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| 63 | ; SS:BP: Ptr to MENUVARS
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| 64 | ; Returns:
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| 65 | ; CF: Set if user wants to save changes
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| 66 | ; Cleared if used does not want to save changes
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| 67 | ; Corrupts registers:
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| 68 | ; AX, BX, CX, DX
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| 69 | ;--------------------------------------------------------------------
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| 70 | ALIGN JUMP_ALIGN
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| 71 | BiosFile_DoesUserWantToSaveChanges:
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| 72 | mov bl, WIDTH_DLG ; Dialog width
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| 73 | mov di, g_szDlgSaveChanges ; ES:DI points to string to display
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| 74 | jmp Menu_ShowYNDlg
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| 75 |
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| 76 |
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| 77 | ;--------------------------------------------------------------------
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| 78 | ; Saves loaded BIOS image to a file.
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| 79 | ;
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| 80 | ; BiosFile_SaveFile
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| 81 | ; Parameters:
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| 82 | ; DS:SI: Ptr to DTA for selected file
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| 83 | ; ES:DI: Ptr to data to save
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| 84 | ; SS:BP: Ptr to MENUVARS
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| 85 | ; Returns:
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| 86 | ; CF: Cleared if file saved successfully
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| 87 | ; Set if any error
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| 88 | ; Corrupts registers:
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| 89 | ; AX, BX, CX, DX
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| 90 | ;--------------------------------------------------------------------
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| 91 | ALIGN JUMP_ALIGN
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| 92 | BiosFile_SaveFile:
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| 93 | ; Open file
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| 94 | mov al, VAL_FACCS_WRITE ; Open for writing
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| 95 | lea dx, [si+DTA.szFile] ; DS:DX points to ASCIZ file name
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| 96 | call File_Open
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| 97 | jc SHORT BiosFile_DisplayFileErrorMessage
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| 98 |
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| 99 | ; Save file
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| 100 | mov cx, [cs:g_cfgVars+CFGVARS.wEepromSize]
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| 101 | call File_Write
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| 102 | jc SHORT BiosFile_DisplayFileErrorMessage
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| 103 |
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| 104 | ; Close file
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| 105 | jmp SHORT BiosFile_Close
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| 106 |
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| 107 |
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| 108 | ;--------------------------------------------------------------------
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| 109 | ; Loads file selected with BiosFile_SelectFile.
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| 110 | ;
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| 111 | ; BiosFile_LoadFile
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| 112 | ; Parameters:
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| 113 | ; DS:SI: Ptr to DTA for selected file
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| 114 | ; ES:DI: Ptr to buffer where to load file
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| 115 | ; SS:BP: Ptr to MENUVARS
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| 116 | ; Returns:
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| 117 | ; CX: EEPROM size in bytes
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| 118 | ; CF: Cleared if file loaded successfully
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| 119 | ; Set if any error
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| 120 | ; Corrupts registers:
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| 121 | ; AX, BX, DX
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| 122 | ;--------------------------------------------------------------------
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| 123 | ALIGN JUMP_ALIGN
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| 124 | BiosFile_LoadFile:
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| 125 | ; Open file
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| 126 | mov al, VAL_FACCS_READ ; Open for reading
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| 127 | lea dx, [si+DTA.szFile] ; DS:DX points to ASCIZ file name
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| 128 | call File_Open
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| 129 | jc SHORT BiosFile_DisplayFileErrorMessage
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| 130 |
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| 131 | ; Load file to buffer
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| 132 | call BiosFile_GetFileSizeToCX
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| 133 | jc SHORT BiosFile_DisplayFileSizeErrorMessage
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| 134 | call File_Read
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| 135 | jc SHORT BiosFile_DisplayFileErrorMessage
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| 136 |
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| 137 | ; Close file
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| 138 | BiosFile_Close:
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| 139 | call File_Close
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| 140 | jc SHORT BiosFile_DisplayFileErrorMessage
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| 141 | ret
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| 142 |
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| 143 |
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| 144 | ;--------------------------------------------------------------------
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| 145 | ; Returns size for selected file and makes sure it is not too large.
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| 146 | ;
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| 147 | ; BiosFile_GetFileSizeToCX
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| 148 | ; Parameters:
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| 149 | ; DS:SI: Ptr to DTA for selected file
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| 150 | ; SS:BP: Ptr to MENUVARS
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| 151 | ; Returns:
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| 152 | ; CX: File size in bytes
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| 153 | ; CF: Set if file was too large
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| 154 | ; Cleared if supported size
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| 155 | ; Corrupts registers:
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| 156 | ; DX
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| 157 | ;--------------------------------------------------------------------
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| 158 | ALIGN JUMP_ALIGN
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| 159 | BiosFile_GetFileSizeToCX:
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| 160 | mov cx, [si+DTA.dwFileSize]
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| 161 | mov dx, [si+DTA.dwFileSize+2]
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| 162 | test dx, dx ; More than 65535 bytes?
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| 163 | jnz SHORT .TooLargeFile
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| 164 | cmp cx, MAX_EEPROM_SIZE ; Too large?
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| 165 | ja SHORT .TooLargeFile
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| 166 | clc
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| 167 | ret
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| 168 | .TooLargeFile:
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| 169 | stc
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| 170 | ret
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| 171 |
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| 172 |
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| 173 | ;--------------------------------------------------------------------
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| 174 | ; Displays error messages related to loading files.
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| 175 | ;
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| 176 | ; BiosFile_DisplayFileErrorMessage
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| 177 | ; BiosFile_DisplayFileSizeErrorMessage
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| 178 | ; Parameters:
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| 179 | ; AX: DOS File I/O error code (BiosFile_DisplayFileErrorMessage only)
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| 180 | ; DS:SI: Ptr to DTA for selected file
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| 181 | ; SS:BP: Ptr to MENUVARS
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| 182 | ; Returns:
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| 183 | ; CF: Set since error
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| 184 | ; Corrupts registers:
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| 185 | ; AX, BX, CX, DX
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| 186 | ;--------------------------------------------------------------------
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| 187 | BiosFile_DisplayFileErrorMessage:
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| 188 | call File_GetErrStr ; Error string to ES:DI
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| 189 | jmp SHORT BiosFile_DisplayErrorMessage
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| 190 | BiosFile_DisplayFileSizeErrorMessage:
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| 191 | push cs
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| 192 | pop es
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| 193 | mov di, g_szErrFileSize
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| 194 | BiosFile_DisplayErrorMessage:
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| 195 | mov bl, WIDTH_DLG ; Dialog width
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| 196 | call Menu_ShowMsgDlg
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| 197 | stc
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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 | ; Selects BIOS file to be loaded.
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| 203 | ;
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| 204 | ; BiosFile_SelectFile
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| 205 | ; Parameters:
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| 206 | ; DS:DI Ptr to MENUPAGEITEM
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| 207 | ; SS:BP: Ptr to MENUVARS
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| 208 | ; Returns:
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| 209 | ; DS:SI: Ptr to DTA for selected file
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| 210 | ; CF: Set if file selected successfully
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| 211 | ; Cleared if user cancellation
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| 212 | ; Corrupts registers:
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| 213 | ; AX, BX, CX, DX, ES
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| 214 | ;--------------------------------------------------------------------
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| 215 | ALIGN JUMP_ALIGN
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| 216 | BiosFile_SelectFile:
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| 217 | push di
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| 218 | push cs ; Copy string segment...
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| 219 | pop es ; ...to ES
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| 220 | mov di, [di+MENUPAGEITEM.szDialog] ; ES:DI points to info string
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| 221 | mov si, g_szFileSearch ; DS:SI points to file search string
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| 222 | mov bl, WIDTH_DLG ; Dialog width
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| 223 | call Menu_ShowFileDlg ; Get DTA to DS:SI
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| 224 | pop di
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| 225 | ret
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