| 1 | ; Project name : XTIDE Universal BIOS Configurator v2
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| 2 | ; Description : Functions for accessing file and flash buffers.
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| 3 |
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| 4 | ;
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| 5 | ; XTIDE Universal BIOS and Associated Tools
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| 6 | ; Copyright (C) 2009-2010 by Tomi Tilli, 2011-2013 by XTIDE Universal BIOS Team.
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| 7 | ;
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| 8 | ; This program is free software; you can redistribute it and/or modify
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| 9 | ; it under the terms of the GNU General Public License as published by
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| 10 | ; the Free Software Foundation; either version 2 of the License, or
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| 11 | ; (at your option) any later version.
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| 12 | ;
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| 13 | ; This program is distributed in the hope that it will be useful,
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| 14 | ; but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | ; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | ; GNU General Public License for more details.
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| 17 | ; Visit http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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| 18 | ;
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| 19 |
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| 20 | ; Section containing code
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| 21 | SECTION .text
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| 22 |
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| 23 | ;--------------------------------------------------------------------
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| 24 | ; Buffers_Clear
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| 25 | ; Parameters:
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| 26 | ; Nothing
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| 27 | ; Returns:
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| 28 | ; Nothing
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| 29 | ; Corrupts registers:
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| 30 | ; AX, CX, DI, ES
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| 31 | ;--------------------------------------------------------------------
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| 32 | ALIGN JUMP_ALIGN
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| 33 | Buffers_Clear:
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| 34 | call Buffers_GetFileBufferToESDI
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| 35 | mov cx, ROMVARS_size
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| 36 | jmp Memory_ZeroESDIwithSizeInCX
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| 37 |
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| 38 |
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| 39 | ;--------------------------------------------------------------------
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| 40 | ; Buffers_IsXtideUniversalBiosLoaded
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| 41 | ; Parameters:
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| 42 | ; Nothing
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| 43 | ; Returns:
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| 44 | ; ZF: Set if supported version of XTIDE Universal BIOS is loaded
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| 45 | ; Cleared no file or some other file is loaded
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| 46 | ; Corrupts registers:
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| 47 | ; CX, SI, DI, ES
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| 48 | ;--------------------------------------------------------------------
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| 49 | ALIGN JUMP_ALIGN
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| 50 | Buffers_IsXtideUniversalBiosLoaded:
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| 51 | test WORD [cs:g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED
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| 52 | jz SHORT .NoFileOrBiosLoaded
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| 53 |
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| 54 | call Buffers_GetFileBufferToESDI
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| 55 | jmp SHORT Buffers_IsXtideUniversalBiosSignatureInESDI
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| 56 | .NoFileOrBiosLoaded:
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| 57 | or cl, 1 ; Clear ZF
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| 58 | ret
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| 59 |
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| 60 |
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| 61 | ;--------------------------------------------------------------------
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| 62 | ; Buffers_IsXtideUniversalBiosSignatureInESDI
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| 63 | ; Parameters:
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| 64 | ; ES:DI: Ptr to possible XTIDE Universal BIOS location
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| 65 | ; Returns:
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| 66 | ; ZF: Set if supported version of XTIDE Universal BIOS is loaded
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| 67 | ; Cleared no file or some other file is loaded
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| 68 | ; Corrupts registers:
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| 69 | ; CX, SI
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| 70 | ;--------------------------------------------------------------------
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| 71 | ALIGN JUMP_ALIGN
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| 72 | Buffers_IsXtideUniversalBiosSignatureInESDI:
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| 73 | push di
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| 74 |
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| 75 | mov si, g_szXtideUniversalBiosSignature
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| 76 | add di, BYTE ROMVARS.rgbSign
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| 77 | mov cx, XTIDE_SIGNATURE_LENGTH / 2
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| 78 | cld
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| 79 | eSEG_STR repe, cs, cmpsw
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| 80 |
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| 81 | pop di
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| 82 | ret
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| 83 |
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| 84 |
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| 85 | ;--------------------------------------------------------------------
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| 86 | ; Buffers_IsXTbuildLoaded
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| 87 | ; Parameters:
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| 88 | ; Nothing
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| 89 | ; Returns:
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| 90 | ; ZF: Set if XT or XT+ build is loaded
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| 91 | ; Cleared if some other (AT, 386) build is loaded
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| 92 | ; Corrupts registers:
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| 93 | ; DI, ES
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| 94 | ;--------------------------------------------------------------------
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| 95 | ALIGN JUMP_ALIGN
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| 96 | Buffers_IsXTbuildLoaded:
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| 97 | %strlen BUILD_TYPE_OFFSET TITLE_STRING_START
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| 98 | call Buffers_GetFileBufferToESDI
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| 99 | cmp WORD [es:di+ROMVARS.szTitle+BUILD_TYPE_OFFSET+1], 'XT' ; +1 is for '('
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| 100 | ret
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| 101 | %undef BUILD_TYPE_OFFSET
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| 102 |
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| 103 |
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| 104 | ;--------------------------------------------------------------------
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| 105 | ; Buffers_NewBiosWithSizeInDXCXandSourceInAXhasBeenLoadedForConfiguration
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| 106 | ; Parameters:
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| 107 | ; AX: EEPROM source (FLG_CFGVARS_FILELOADED or FLG_CFGVARS_ROMLOADED)
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| 108 | ; DX:CX: EEPROM size in bytes
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| 109 | ; Returns:
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| 110 | ; Nothing
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| 111 | ; Corrupts registers:
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| 112 | ; AX, CX, DX
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| 113 | ;--------------------------------------------------------------------
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| 114 | ALIGN JUMP_ALIGN
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| 115 | Buffers_NewBiosWithSizeInDXCXandSourceInAXhasBeenLoadedForConfiguration:
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| 116 | and WORD [cs:g_cfgVars+CFGVARS.wFlags], ~(FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED | FLG_CFGVARS_UNSAVED)
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| 117 | or WORD [cs:g_cfgVars+CFGVARS.wFlags], ax
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| 118 | shr dx, 1
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| 119 | rcr cx, 1
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| 120 | adc cx, BYTE 0 ; Round up to next WORD
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| 121 | mov [cs:g_cfgVars+CFGVARS.wImageSizeInWords], cx
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| 122 | ret
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| 123 |
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| 124 |
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| 125 | ;--------------------------------------------------------------------
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| 126 | ; Buffers_SetUnsavedChanges
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| 127 | ; Buffers_ClearUnsavedChanges
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| 128 | ; Parameters:
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| 129 | ; SS:BP: Menu handle
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| 130 | ; Returns:
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| 131 | ; Nothing
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| 132 | ; Corrupts registers:
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| 133 | ; Nothing
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| 134 | ;--------------------------------------------------------------------
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| 135 | ALIGN JUMP_ALIGN
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| 136 | Buffers_SetUnsavedChanges:
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| 137 | or WORD [cs:g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_UNSAVED
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| 138 | ret
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| 139 |
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| 140 | ALIGN JUMP_ALIGN
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| 141 | Buffers_ClearUnsavedChanges:
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| 142 | and WORD [cs:g_cfgVars+CFGVARS.wFlags], ~FLG_CFGVARS_UNSAVED
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| 143 | ret
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| 144 |
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| 145 |
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| 146 | ;--------------------------------------------------------------------
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| 147 | ; Buffers_SaveChangesIfFileLoaded
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| 148 | ; Parameters:
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| 149 | ; Nothing
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| 150 | ; Returns:
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| 151 | ; Nothing
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| 152 | ; Corrupts registers:
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| 153 | ; AX, BX, CX, SI, DI
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| 154 | ;--------------------------------------------------------------------
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| 155 | ALIGN JUMP_ALIGN
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| 156 | Buffers_SaveChangesIfFileLoaded:
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| 157 | mov ax, [cs:g_cfgVars+CFGVARS.wFlags]
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| 158 | and ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED)
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| 159 | cmp ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED)
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| 160 | jne SHORT .NothingToSave
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| 161 | call Dialogs_DisplaySaveChangesDialog
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| 162 | jnz SHORT .NothingToSave
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| 163 | jmp BiosFile_SaveUnsavedChanges
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| 164 | ALIGN JUMP_ALIGN
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| 165 | .NothingToSave:
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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 | ; Buffers_AppendZeroesIfNeeded
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| 171 | ; Parameters:
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| 172 | ; Nothing
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| 173 | ; Returns:
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| 174 | ; Nothing
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| 175 | ; Corrupts registers:
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| 176 | ; AX, CX, DI
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| 177 | ;--------------------------------------------------------------------
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| 178 | ALIGN JUMP_ALIGN
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| 179 | Buffers_AppendZeroesIfNeeded:
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| 180 | push es
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| 181 |
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| 182 | eMOVZX di, [cs:g_cfgVars+CFGVARS.bEepromType]
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| 183 | mov cx, [cs:di+g_rgwEepromTypeToSizeInWords]
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| 184 | sub cx, [cs:g_cfgVars+CFGVARS.wImageSizeInWords] ; CX = WORDs to append
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| 185 | jle SHORT .NoNeedToAppendZeroes
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| 186 |
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| 187 | call Buffers_GetFileBufferToESDI
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| 188 | mov ax, [cs:g_cfgVars+CFGVARS.wImageSizeInWords]
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| 189 | shl ax, 1
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| 190 | add di, ax ; ES:DI now point first unused image byte
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| 191 | xor ax, ax
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| 192 | cld
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| 193 | rep stosw
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| 194 | ALIGN JUMP_ALIGN
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| 195 | .NoNeedToAppendZeroes:
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| 196 | pop es
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| 197 | ret
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| 198 |
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| 199 |
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| 200 | ;--------------------------------------------------------------------
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| 201 | ; Buffers_GenerateChecksum
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| 202 | ; Parameters:
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| 203 | ; Nothing
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| 204 | ; Returns:
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| 205 | ; Nothing
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| 206 | ; Corrupts registers:
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| 207 | ; AX, BX, CX, DI
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| 208 | ;--------------------------------------------------------------------
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| 209 | ALIGN JUMP_ALIGN
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| 210 | Buffers_GenerateChecksum:
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| 211 | push es
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| 212 | push dx
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| 213 |
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| 214 | call Buffers_GetFileBufferToESDI
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| 215 | call EEPROM_GetXtideUniversalBiosSizeFromESDItoDXCX
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| 216 | dec cx ; Leave space for checksum byte
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| 217 | xor ax, ax
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| 218 | ALIGN JUMP_ALIGN
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| 219 | .SumNextByte:
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| 220 | add al, [es:di]
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| 221 | inc di
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| 222 | loop .SumNextByte
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| 223 | neg al
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| 224 | mov [es:di], al
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| 225 |
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| 226 | pop dx
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| 227 | pop es
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| 228 | ret
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| 229 |
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| 230 |
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| 231 | ;--------------------------------------------------------------------
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| 232 | ; Buffers_GetRomvarsFlagsToAX
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| 233 | ; Parameters:
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| 234 | ; Nothing
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| 235 | ; Returns:
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| 236 | ; AX: ROMVARS.wFlags
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| 237 | ; Corrupts registers:
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| 238 | ; BX
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| 239 | ;--------------------------------------------------------------------
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| 240 | ALIGN JUMP_ALIGN
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| 241 | Buffers_GetRomvarsFlagsToAX:
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| 242 | mov bx, ROMVARS.wFlags
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| 243 | ; Fall to Buffers_GetRomvarsValueToAXfromOffsetInBX
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| 244 |
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| 245 | ;--------------------------------------------------------------------
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| 246 | ; Buffers_GetRomvarsValueToAXfromOffsetInBX
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| 247 | ; Parameters:
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| 248 | ; BX: ROMVARS offset
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| 249 | ; Returns:
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| 250 | ; AX: Value
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| 251 | ; Corrupts registers:
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| 252 | ; Nothing
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| 253 | ;--------------------------------------------------------------------
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| 254 | ALIGN JUMP_ALIGN
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| 255 | Buffers_GetRomvarsValueToAXfromOffsetInBX:
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| 256 | push es
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| 257 | push di
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| 258 | call Buffers_GetFileBufferToESDI
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| 259 | mov ax, [es:bx+di]
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| 260 | pop di
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| 261 | pop es
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| 262 | ret
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| 263 |
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| 264 |
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| 265 | ;--------------------------------------------------------------------
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| 266 | ; Buffers_GetIdeControllerCountToCX
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| 267 | ; Parameters:
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| 268 | ; SS:BP: Menu handle
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| 269 | ; Returns:
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| 270 | ; CX: Number of IDE controllers to configure
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| 271 | ; ES:DI: Ptr to file buffer
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| 272 | ; Corrupts registers:
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| 273 | ; AX
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| 274 | ;--------------------------------------------------------------------
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| 275 | ALIGN JUMP_ALIGN
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| 276 | Buffers_GetIdeControllerCountToCX:
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| 277 | call Buffers_GetFileBufferToESDI
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| 278 | mov al, [es:di+ROMVARS.bIdeCnt]
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| 279 |
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| 280 | ; Limit controller count for lite mode
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| 281 | test BYTE [es:di+ROMVARS.wFlags], FLG_ROMVARS_FULLMODE
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| 282 | jnz SHORT .ReturnControllerCountInCX
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| 283 | MIN_U al, MAX_LITE_MODE_CONTROLLERS
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| 284 |
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| 285 | .ReturnControllerCountInCX:
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| 286 | cbw ; A maximum of 127 controllers should be sufficient
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| 287 | xchg cx, ax
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| 288 | ret
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| 289 |
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| 290 |
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| 291 | ;--------------------------------------------------------------------
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| 292 | ; Buffers_GetFileBufferToESDI
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| 293 | ; Buffers_GetFlashComparisonBufferToESDI
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| 294 | ; Buffers_GetFileDialogItemBufferToESDI
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| 295 | ; Parameters:
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| 296 | ; Nothing
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| 297 | ; Returns:
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| 298 | ; ES:DI: Ptr to file buffer
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| 299 | ; Corrupts registers:
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| 300 | ; Nothing
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| 301 | ;--------------------------------------------------------------------
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| 302 | ALIGN JUMP_ALIGN
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| 303 | Buffers_GetFlashComparisonBufferToESDI:
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| 304 | Buffers_GetFileDialogItemBufferToESDI:
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| 305 | call Buffers_GetFileBufferToESDI
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| 306 | push di
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| 307 | mov di, es
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| 308 | add di, 1000h ; Third 64k page
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| 309 | mov es, di
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| 310 | pop di
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| 311 | ret
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| 312 | ALIGN JUMP_ALIGN
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| 313 | Buffers_GetFileBufferToESDI:
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| 314 | mov di, cs
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| 315 | add di, 1000h ; Change to next 64k page
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| 316 | mov es, di
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| 317 | xor di, di ; Ptr now in ES:DI
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| 318 | ret
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