| 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 : 6.12.2010
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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 | ; DX: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, CX, DX
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| 82 | ;--------------------------------------------------------------------
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| 83 | ALIGN JUMP_ALIGN
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| 84 | Buffers_NewBiosWithSizeInDXCXandSourceInAXhasBeenLoadedForConfiguration:
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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 | shr dx, 1
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| 88 | rcr cx, 1
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| 89 | mov [cs:g_cfgVars+CFGVARS.wImageSizeInWords], cx
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| 90 | ret
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| 91 |
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| 92 |
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| 93 | ;--------------------------------------------------------------------
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| 94 | ; Buffers_SetUnsavedChanges
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| 95 | ; Buffers_ClearUnsavedChanges
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| 96 | ; Parameters:
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| 97 | ; SS:BP: Menu handle
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| 98 | ; Returns:
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| 99 | ; Nothing
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| 100 | ; Corrupts registers:
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| 101 | ; Nothing
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| 102 | ;--------------------------------------------------------------------
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| 103 | ALIGN JUMP_ALIGN
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| 104 | Buffers_SetUnsavedChanges:
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| 105 | or WORD [g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_UNSAVED
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| 106 | ret
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| 107 |
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| 108 | ALIGN JUMP_ALIGN
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| 109 | Buffers_ClearUnsavedChanges:
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| 110 | and WORD [g_cfgVars+CFGVARS.wFlags], ~FLG_CFGVARS_UNSAVED
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| 111 | ret
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| 112 |
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| 113 |
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| 114 | ;--------------------------------------------------------------------
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| 115 | ; Buffers_SaveChangesIfFileLoaded
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| 116 | ; Parameters:
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| 117 | ; Nothing
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| 118 | ; Returns:
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| 119 | ; Nothing
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| 120 | ; Corrupts registers:
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| 121 | ; AX, BX, CX, SI, DI
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| 122 | ;--------------------------------------------------------------------
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| 123 | ALIGN JUMP_ALIGN
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| 124 | Buffers_SaveChangesIfFileLoaded:
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| 125 | mov ax, [cs:g_cfgVars+CFGVARS.wFlags]
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| 126 | and ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED)
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| 127 | cmp ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED)
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| 128 | jne SHORT .NothingToSave
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| 129 | call Dialogs_DisplaySaveChangesDialog
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| 130 | jnz SHORT .NothingToSave
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| 131 | jmp BiosFile_SaveUnsavedChanges
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| 132 | ALIGN JUMP_ALIGN
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| 133 | .NothingToSave:
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| 134 | ret
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| 135 |
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| 136 |
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| 137 | ;--------------------------------------------------------------------
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| 138 | ; Buffers_AppendZeroesIfNeeded
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| 139 | ; Parameters:
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| 140 | ; Nothing
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| 141 | ; Returns:
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| 142 | ; Nothing
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| 143 | ; Corrupts registers:
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| 144 | ; AX, CX, DI
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| 145 | ;--------------------------------------------------------------------
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| 146 | ALIGN JUMP_ALIGN
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| 147 | Buffers_AppendZeroesIfNeeded:
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| 148 | push es
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| 149 |
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| 150 | eMOVZX di, BYTE [cs:g_cfgVars+CFGVARS.bEepromType]
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| 151 | mov cx, [cs:di+g_rgwEepromTypeToSizeInWords]
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| 152 | sub cx, [cs:g_cfgVars+CFGVARS.wImageSizeInWords] ; CX = WORDs to append
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| 153 | jle SHORT .NoNeedToAppendZeroes
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| 154 |
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| 155 | call Buffers_GetFileBufferToESDI
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| 156 | mov ax, [cs:g_cfgVars+CFGVARS.wImageSizeInWords]
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| 157 | shl ax, 1
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| 158 | add di, ax ; ES:DI now point first unused image byte
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| 159 | xor ax, ax
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| 160 | cld
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| 161 | rep stosw
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| 162 | ALIGN JUMP_ALIGN
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| 163 | .NoNeedToAppendZeroes:
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| 164 | pop es
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| 165 | ret
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| 166 |
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| 167 |
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| 168 | ;--------------------------------------------------------------------
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| 169 | ; Buffers_GenerateChecksum
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| 170 | ; Parameters:
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| 171 | ; Nothing
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| 172 | ; Returns:
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| 173 | ; Nothing
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| 174 | ; Corrupts registers:
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| 175 | ; AX, BX, CX, DI
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| 176 | ;--------------------------------------------------------------------
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| 177 | ALIGN JUMP_ALIGN
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| 178 | Buffers_GenerateChecksum:
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| 179 | push es
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| 180 |
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| 181 | call Buffers_GetFileBufferToESDI
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| 182 | mov cx, [cs:g_cfgVars+CFGVARS.wImageSizeInWords]
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| 183 | shl cx, 1 ; Words to bytes
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| 184 | dec cx ; Leave space for checksum byte
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| 185 | xor ax, ax
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| 186 | ALIGN JUMP_ALIGN
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| 187 | .SumNextByte:
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| 188 | add al, [es:di]
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| 189 | inc di
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| 190 | loop .SumNextByte
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| 191 | neg al
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| 192 | mov [es:di], al
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| 193 |
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| 194 | pop es
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| 195 | ret
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| 196 |
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| 197 |
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| 198 | ;--------------------------------------------------------------------
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| 199 | ; Buffers_GetRomvarsFlagsToAX
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| 200 | ; Parameters:
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| 201 | ; Nothing
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| 202 | ; Returns:
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| 203 | ; AX: ROMVARS.wFlags
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| 204 | ; Corrupts registers:
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| 205 | ; BX
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| 206 | ;--------------------------------------------------------------------
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| 207 | ALIGN JUMP_ALIGN
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| 208 | Buffers_GetRomvarsFlagsToAX:
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| 209 | mov bx, ROMVARS.wFlags
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| 210 | ; Fall to Buffers_GetRomvarsValueToAXfromOffsetInBX
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| 211 |
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| 212 | ;--------------------------------------------------------------------
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| 213 | ; Buffers_GetRomvarsValueToAXfromOffsetInBX
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| 214 | ; Parameters:
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| 215 | ; BX: ROMVARS offset
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| 216 | ; Returns:
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| 217 | ; AX: Value
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| 218 | ; Corrupts registers:
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| 219 | ; Nothing
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| 220 | ;--------------------------------------------------------------------
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| 221 | ALIGN JUMP_ALIGN
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| 222 | Buffers_GetRomvarsValueToAXfromOffsetInBX:
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| 223 | push es
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| 224 | push di
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| 225 | call Buffers_GetFileBufferToESDI
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| 226 | mov ax, [es:bx+di]
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| 227 | pop di
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| 228 | pop es
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| 229 | ret
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| 230 |
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| 231 |
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| 232 | ;--------------------------------------------------------------------
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| 233 | ; Buffers_GetFileBufferToESDI
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| 234 | ; Buffers_GetFlashComparisonBufferToESDI
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| 235 | ; Buffers_GetFileDialogItemBufferToESDI
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| 236 | ; Parameters:
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| 237 | ; Nothing
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| 238 | ; Returns:
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| 239 | ; ES:DI: Ptr to file buffer
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| 240 | ; Corrupts registers:
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| 241 | ; Nothing
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| 242 | ;--------------------------------------------------------------------
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| 243 | ALIGN JUMP_ALIGN
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| 244 | Buffers_GetFlashComparisonBufferToESDI:
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| 245 | Buffers_GetFileDialogItemBufferToESDI:
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| 246 | call Buffers_GetFileBufferToESDI
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| 247 | push di
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| 248 | mov di, es
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| 249 | add di, 1000h ; Third 64k page
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| 250 | mov es, di
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| 251 | pop di
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| 252 | ret
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| 253 | ALIGN JUMP_ALIGN
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| 254 | Buffers_GetFileBufferToESDI:
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| 255 | mov di, cs
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| 256 | add di, 1000h ; Change to next 64k page
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| 257 | mov es, di
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| 258 | xor di, di ; Ptr now in ES:DI
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| 259 | ret
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