| 1 | ; File name : Buffers.asm
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| 2 | ; Project name : XTIDE Universal BIOS Configurator v2
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| 3 | ; Created date : 6.10.2010
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| 4 | ; Last update : 19.11.2010
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| 5 | ; Author : Tomi Tilli
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| 6 | ; Description : Functions for accessing file and flash buffers.
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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 | ; Buffers_Clear
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| 13 | ; Parameters:
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| 14 | ; Nothing
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| 15 | ; Returns:
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| 16 | ; Nothing
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| 17 | ; Corrupts registers:
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| 18 | ; AX, CX, DI, ES
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| 19 | ;--------------------------------------------------------------------
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| 20 | ALIGN JUMP_ALIGN
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| 21 | Buffers_Clear:
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| 22 | call Buffers_GetFileBufferToESDI
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| 23 | mov cx, ROMVARS_size
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| 24 | jmp Memory_ZeroESDIwithSizeInCX
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| 25 |
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| 26 |
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| 27 | ;--------------------------------------------------------------------
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| 28 | ; Buffers_IsXtideUniversalBiosLoaded
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| 29 | ; Parameters:
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| 30 | ; Nothing
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| 31 | ; Returns:
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| 32 | ; ZF: Set if supported version of XTIDE Universal BIOS is loaded
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| 33 | ; Cleared no file or some other file is loaded
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| 34 | ; Corrupts registers:
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| 35 | ; CX, SI, DI, ES
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| 36 | ;--------------------------------------------------------------------
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| 37 | ALIGN JUMP_ALIGN
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| 38 | Buffers_IsXtideUniversalBiosLoaded:
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| 39 | test WORD [cs:g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED
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| 40 | jz SHORT .NoFileOrBiosLoaded
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| 41 |
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| 42 | call Buffers_GetFileBufferToESDI
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| 43 | jmp SHORT Buffers_IsXtideUniversalBiosSignatureInESDI
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| 44 | .NoFileOrBiosLoaded:
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| 45 | or cl, 1 ; Clear ZF
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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 | ; Buffers_IsXtideUniversalBiosSignatureInESDI
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| 51 | ; Parameters:
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| 52 | ; ES:DI: Ptr to possible XTIDE Universal BIOS location
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| 53 | ; Returns:
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| 54 | ; ZF: Set if supported version of XTIDE Universal BIOS is loaded
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| 55 | ; Cleared no file or some other file is loaded
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| 56 | ; Corrupts registers:
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| 57 | ; CX, SI
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| 58 | ;--------------------------------------------------------------------
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| 59 | ALIGN JUMP_ALIGN
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| 60 | Buffers_IsXtideUniversalBiosSignatureInESDI:
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| 61 | push di
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| 62 |
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| 63 | mov si, g_szXtideUniversalBiosSignature
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| 64 | add di, BYTE ROMVARS.rgbSign
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| 65 | mov cx, XTIDE_SIGNATURE_LENGTH / 2
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| 66 | cld
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| 67 | eSEG_STR repe, cs, cmpsw
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| 68 |
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| 69 | pop di
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| 70 | ret
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| 71 |
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| 72 |
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| 73 | ;--------------------------------------------------------------------
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| 74 | ; Buffers_NewBiosWithSizeInCXandSourceInAXhasBeenLoadedForConfiguration
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| 75 | ; Parameters:
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| 76 | ; AX: EEPROM source (FLG_CFGVARS_FILELOADED or FLG_CFGVARS_ROMLOADED)
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| 77 | ; CX: EEPROM size in bytes
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| 78 | ; Returns:
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| 79 | ; Nothing
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| 80 | ; Corrupts registers:
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| 81 | ; AX, BX, CX, DX
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| 82 | ;--------------------------------------------------------------------
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| 83 | ALIGN JUMP_ALIGN
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| 84 | Buffers_NewBiosWithSizeInCXandSourceInAXhasBeenLoadedForConfiguration:
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| 85 | and WORD [cs:g_cfgVars+CFGVARS.wFlags], ~(FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED | FLG_CFGVARS_UNSAVED)
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| 86 | or WORD [cs:g_cfgVars+CFGVARS.wFlags], ax
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| 87 | ; Fall to .AdjustBiosImageSizeToSupportedEepromSize
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| 88 |
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| 89 | ;--------------------------------------------------------------------
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| 90 | ; .AdjustBiosImageSizeInCXtoSupportedEepromSize
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| 91 | ; Parameters:
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| 92 | ; CX: Size of loaded BIOS image
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| 93 | ; Returns:
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| 94 | ; CX: Size of BIOS image (and EEPROM required)
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| 95 | ; Corrupts registers:
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| 96 | ; AX, BX, DX
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| 97 | ;--------------------------------------------------------------------
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| 98 | .AdjustBiosImageSizeInCXtoSupportedEepromSize:
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| 99 | mov bx, .rgwSupportedEepromSizes
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| 100 | mov dx, NUMBER_OF_SUPPORTED_EEPROM_SIZES-1
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| 101 | ALIGN JUMP_ALIGN
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| 102 | .CheckNextEepromSize:
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| 103 | cmp cx, [cs:bx]
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| 104 | je SHORT .StoreImageSizeFromCX
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| 105 | jb SHORT .AppendZeroesToTheEndOfBuffer
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| 106 | inc bx
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| 107 | inc bx
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| 108 | dec dx
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| 109 | jnz SHORT .CheckNextEepromSize
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| 110 | xor cx, cx
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| 111 | jmp SHORT .StoreImageSizeFromCX ; 0 = 65536
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| 112 | ALIGN WORD_ALIGN
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| 113 | .rgwSupportedEepromSizes:
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| 114 | dw 4<<10
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| 115 | dw 8<<10
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| 116 | dw 16<<10
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| 117 | dw 32<<10
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| 118 |
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| 119 | ;--------------------------------------------------------------------
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| 120 | ; .AppendZeroesToTheEndOfBuffer
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| 121 | ; Parameters:
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| 122 | ; CX: Size of loaded BIOS image
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| 123 | ; CS:BX: Ptr to EEPROM size
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| 124 | ; Returns:
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| 125 | ; CX: EEPROM size
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| 126 | ; Corrupts registers:
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| 127 | ; AX
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| 128 | ;--------------------------------------------------------------------
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| 129 | ALIGN JUMP_ALIGN
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| 130 | .AppendZeroesToTheEndOfBuffer:
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| 131 | push es
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| 132 | push di
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| 133 |
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| 134 | call Buffers_GetFileBufferToESDI
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| 135 | mov ax, [cs:bx]
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| 136 | sub ax, cx ; AX = zeroes to append
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| 137 | xchg ax, cx ; AX = BIOS image size, CX = zeroes to append
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| 138 | add di, ax
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| 139 | call Memory_ZeroESDIwithSizeInCX
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| 140 | mov cx, [cs:bx]
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| 141 |
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| 142 | pop di
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| 143 | pop es
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| 144 | ; Fall to .StoreImageSizeFromCX
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| 145 |
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| 146 | ;--------------------------------------------------------------------
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| 147 | ; .StoreImageSizeFromCX
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| 148 | ; Parameters:
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| 149 | ; CX: Size of BIOS image (and EEPROM required)
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| 150 | ; Returns:
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| 151 | ; Nothing
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| 152 | ; Corrupts registers:
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| 153 | ; Nothing
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| 154 | ;--------------------------------------------------------------------
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| 155 | ALIGN JUMP_ALIGN
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| 156 | .StoreImageSizeFromCX:
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| 157 | mov [cs:g_cfgVars+CFGVARS.wImageSize], cx
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| 158 | ret
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| 159 |
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| 160 |
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| 161 | ;--------------------------------------------------------------------
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| 162 | ; Buffers_SetUnsavedChanges
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| 163 | ; Buffers_ClearUnsavedChanges
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| 164 | ; Parameters:
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| 165 | ; SS:BP: Menu handle
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| 166 | ; Returns:
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| 167 | ; Nothing
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| 168 | ; Corrupts registers:
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| 169 | ; Nothing
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| 170 | ;--------------------------------------------------------------------
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| 171 | ALIGN JUMP_ALIGN
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| 172 | Buffers_SetUnsavedChanges:
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| 173 | or WORD [g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_UNSAVED
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| 174 | ret
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| 175 |
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| 176 | ALIGN JUMP_ALIGN
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| 177 | Buffers_ClearUnsavedChanges:
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| 178 | and WORD [g_cfgVars+CFGVARS.wFlags], ~FLG_CFGVARS_UNSAVED
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| 179 | ret
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| 180 |
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| 181 |
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| 182 | ;--------------------------------------------------------------------
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| 183 | ; Buffers_SaveChangesIfFileLoaded
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| 184 | ; Parameters:
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| 185 | ; Nothing
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| 186 | ; Returns:
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| 187 | ; Nothing
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| 188 | ; Corrupts registers:
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| 189 | ; AX, BX, CX, SI, DI
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| 190 | ;--------------------------------------------------------------------
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| 191 | ALIGN JUMP_ALIGN
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| 192 | Buffers_SaveChangesIfFileLoaded:
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| 193 | mov ax, [cs:g_cfgVars+CFGVARS.wFlags]
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| 194 | and ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED)
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| 195 | cmp ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED)
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| 196 | jne SHORT .NothingToSave
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| 197 | call Dialogs_DisplaySaveChangesDialog
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| 198 | jnz SHORT .NothingToSave
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| 199 | jmp BiosFile_SaveUnsavedChanges
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| 200 | ALIGN JUMP_ALIGN
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| 201 | .NothingToSave:
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| 202 | ret
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| 203 |
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| 204 |
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| 205 | ;--------------------------------------------------------------------
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| 206 | ; Buffers_GenerateChecksum
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| 207 | ; Parameters:
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| 208 | ; Nothing
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| 209 | ; Returns:
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| 210 | ; Nothing
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| 211 | ; Corrupts registers:
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| 212 | ; AX, BX, CX, DI
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| 213 | ;--------------------------------------------------------------------
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| 214 | ALIGN JUMP_ALIGN
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| 215 | Buffers_GenerateChecksum:
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| 216 | push es
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| 217 |
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| 218 | call Buffers_GetFileBufferToESDI
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| 219 | mov cx, [cs:g_cfgVars+CFGVARS.wImageSize]
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| 220 | dec cx ; Leave space for checksum byte
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| 221 | xor ax, ax
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| 222 | ALIGN JUMP_ALIGN
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| 223 | .SumNextByte:
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| 224 | add al, [es:di]
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| 225 | inc di
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| 226 | loop .SumNextByte
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| 227 | neg al
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| 228 | mov [es:di], al
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| 229 |
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| 230 | pop es
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| 231 | ret
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| 232 |
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| 233 |
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| 234 | ;--------------------------------------------------------------------
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| 235 | ; Buffers_GetRomvarsFlagsToAX
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| 236 | ; Parameters:
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| 237 | ; Nothing
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| 238 | ; Returns:
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| 239 | ; AX: ROMVARS.wFlags
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| 240 | ; Corrupts registers:
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| 241 | ; BX
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| 242 | ;--------------------------------------------------------------------
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| 243 | ALIGN JUMP_ALIGN
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| 244 | Buffers_GetRomvarsFlagsToAX:
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| 245 | mov bx, ROMVARS.wFlags
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| 246 | ; Fall to Buffers_GetRomvarsValueToAXfromOffsetInBX
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| 247 |
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| 248 | ;--------------------------------------------------------------------
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| 249 | ; Buffers_GetRomvarsValueToAXfromOffsetInBX
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| 250 | ; Parameters:
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| 251 | ; BX: ROMVARS offset
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| 252 | ; Returns:
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| 253 | ; AX: Value
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| 254 | ; Corrupts registers:
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| 255 | ; Nothing
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| 256 | ;--------------------------------------------------------------------
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| 257 | ALIGN JUMP_ALIGN
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| 258 | Buffers_GetRomvarsValueToAXfromOffsetInBX:
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| 259 | push es
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| 260 | push di
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| 261 | call Buffers_GetFileBufferToESDI
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| 262 | mov ax, [es:bx+di]
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| 263 | pop di
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| 264 | pop es
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| 265 | ret
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| 266 |
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| 267 |
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| 268 | ;--------------------------------------------------------------------
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| 269 | ; Buffers_GetFileBufferToESDI
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| 270 | ; Buffers_GetFileDialogItemBufferToESDI
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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 file buffer
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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 | Buffers_GetFileDialogItemBufferToESDI:
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| 280 | call Buffers_GetFileBufferToESDI
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| 281 | push di
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| 282 | mov di, es
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| 283 | add di, 1000h ; Third 64k page
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| 284 | mov es, di
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| 285 | pop di
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| 286 | ret
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| 287 | Buffers_GetFileBufferToESDI:
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| 288 | mov di, cs
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| 289 | add di, 1000h ; Change to next 64k page
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| 290 | mov es, di
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| 291 | xor di, di ; Ptr now in ES:DI
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| 292 | ret
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