source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS_Configurator_v2/Src/Buffers.asm@ 194

Last change on this file since 194 was 145, checked in by krille_n_@…, 14 years ago

Minor size optimizations to all parts of the project (even the old Configurator).
Also added a new 'release' option to the makefiles of both versions of the Configurator. It invokes UPX and makes the Configurator programs ridiculously tiny.
File size: 6.8 KB
Line 
1; Project name : XTIDE Universal BIOS Configurator v2
2; Description : Functions for accessing file and flash buffers.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; Buffers_Clear
9; Parameters:
10; Nothing
11; Returns:
12; Nothing
13; Corrupts registers:
14; AX, CX, DI, ES
15;--------------------------------------------------------------------
16ALIGN JUMP_ALIGN
17Buffers_Clear:
18 call Buffers_GetFileBufferToESDI
19 mov cx, ROMVARS_size
20 jmp Memory_ZeroESDIwithSizeInCX
21
22
23;--------------------------------------------------------------------
24; Buffers_IsXtideUniversalBiosLoaded
25; Parameters:
26; Nothing
27; Returns:
28; ZF: Set if supported version of XTIDE Universal BIOS is loaded
29; Cleared no file or some other file is loaded
30; Corrupts registers:
31; CX, SI, DI, ES
32;--------------------------------------------------------------------
33ALIGN JUMP_ALIGN
34Buffers_IsXtideUniversalBiosLoaded:
35 test WORD [cs:g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED
36 jz SHORT .NoFileOrBiosLoaded
37
38 call Buffers_GetFileBufferToESDI
39 jmp SHORT Buffers_IsXtideUniversalBiosSignatureInESDI
40.NoFileOrBiosLoaded:
41 or cl, 1 ; Clear ZF
42 ret
43
44
45;--------------------------------------------------------------------
46; Buffers_IsXtideUniversalBiosSignatureInESDI
47; Parameters:
48; ES:DI: Ptr to possible XTIDE Universal BIOS location
49; Returns:
50; ZF: Set if supported version of XTIDE Universal BIOS is loaded
51; Cleared no file or some other file is loaded
52; Corrupts registers:
53; CX, SI
54;--------------------------------------------------------------------
55ALIGN JUMP_ALIGN
56Buffers_IsXtideUniversalBiosSignatureInESDI:
57 push di
58
59 mov si, g_szXtideUniversalBiosSignature
60 add di, BYTE ROMVARS.rgbSign
61 mov cx, XTIDE_SIGNATURE_LENGTH / 2
62 cld
63 eSEG_STR repe, cs, cmpsw
64
65 pop di
66 ret
67
68
69;--------------------------------------------------------------------
70; Buffers_NewBiosWithSizeInDXCXandSourceInAXhasBeenLoadedForConfiguration
71; Parameters:
72; AX: EEPROM source (FLG_CFGVARS_FILELOADED or FLG_CFGVARS_ROMLOADED)
73; DX:CX: EEPROM size in bytes
74; Returns:
75; Nothing
76; Corrupts registers:
77; AX, CX, DX
78;--------------------------------------------------------------------
79ALIGN JUMP_ALIGN
80Buffers_NewBiosWithSizeInDXCXandSourceInAXhasBeenLoadedForConfiguration:
81 and WORD [cs:g_cfgVars+CFGVARS.wFlags], ~(FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED | FLG_CFGVARS_UNSAVED)
82 or WORD [cs:g_cfgVars+CFGVARS.wFlags], ax
83 shr dx, 1
84 rcr cx, 1
85 adc cx, BYTE 0 ; Round up to next WORD
86 mov [cs:g_cfgVars+CFGVARS.wImageSizeInWords], cx
87 ret
88
89
90;--------------------------------------------------------------------
91; Buffers_SetUnsavedChanges
92; Buffers_ClearUnsavedChanges
93; Parameters:
94; SS:BP: Menu handle
95; Returns:
96; Nothing
97; Corrupts registers:
98; Nothing
99;--------------------------------------------------------------------
100ALIGN JUMP_ALIGN
101Buffers_SetUnsavedChanges:
102 or WORD [g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_UNSAVED
103 ret
104
105ALIGN JUMP_ALIGN
106Buffers_ClearUnsavedChanges:
107 and WORD [g_cfgVars+CFGVARS.wFlags], ~FLG_CFGVARS_UNSAVED
108 ret
109
110
111;--------------------------------------------------------------------
112; Buffers_SaveChangesIfFileLoaded
113; Parameters:
114; Nothing
115; Returns:
116; Nothing
117; Corrupts registers:
118; AX, BX, CX, SI, DI
119;--------------------------------------------------------------------
120ALIGN JUMP_ALIGN
121Buffers_SaveChangesIfFileLoaded:
122 mov ax, [cs:g_cfgVars+CFGVARS.wFlags]
123 and ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED)
124 cmp ax, BYTE (FLG_CFGVARS_FILELOADED | FLG_CFGVARS_UNSAVED)
125 jne SHORT .NothingToSave
126 call Dialogs_DisplaySaveChangesDialog
127 jnz SHORT .NothingToSave
128 jmp BiosFile_SaveUnsavedChanges
129ALIGN JUMP_ALIGN
130.NothingToSave:
131 ret
132
133
134;--------------------------------------------------------------------
135; Buffers_AppendZeroesIfNeeded
136; Parameters:
137; Nothing
138; Returns:
139; Nothing
140; Corrupts registers:
141; AX, CX, DI
142;--------------------------------------------------------------------
143ALIGN JUMP_ALIGN
144Buffers_AppendZeroesIfNeeded:
145 push es
146
147 eMOVZX di, BYTE [cs:g_cfgVars+CFGVARS.bEepromType]
148 mov cx, [cs:di+g_rgwEepromTypeToSizeInWords]
149 sub cx, [cs:g_cfgVars+CFGVARS.wImageSizeInWords] ; CX = WORDs to append
150 jle SHORT .NoNeedToAppendZeroes
151
152 call Buffers_GetFileBufferToESDI
153 mov ax, [cs:g_cfgVars+CFGVARS.wImageSizeInWords]
154 shl ax, 1
155 add di, ax ; ES:DI now point first unused image byte
156 xor ax, ax
157 cld
158 rep stosw
159ALIGN JUMP_ALIGN
160.NoNeedToAppendZeroes:
161 pop es
162 ret
163
164
165;--------------------------------------------------------------------
166; Buffers_GenerateChecksum
167; Parameters:
168; Nothing
169; Returns:
170; Nothing
171; Corrupts registers:
172; AX, BX, CX, DI
173;--------------------------------------------------------------------
174ALIGN JUMP_ALIGN
175Buffers_GenerateChecksum:
176 push es
177
178 call Buffers_GetFileBufferToESDI
179 mov ax, [cs:g_cfgVars+CFGVARS.wImageSizeInWords]
180 call EEPROM_GetSmallestEepromSizeInWordsToCXforImageWithWordSizeInAX
181 shl cx, 1 ; Words to bytes
182 dec cx ; Leave space for checksum byte
183 xor ax, ax
184ALIGN JUMP_ALIGN
185.SumNextByte:
186 add al, [es:di]
187 inc di
188 loop .SumNextByte
189 neg al
190 mov [es:di], al
191
192 pop es
193 ret
194
195
196;--------------------------------------------------------------------
197; Buffers_GetRomvarsFlagsToAX
198; Parameters:
199; Nothing
200; Returns:
201; AX: ROMVARS.wFlags
202; Corrupts registers:
203; BX
204;--------------------------------------------------------------------
205ALIGN JUMP_ALIGN
206Buffers_GetRomvarsFlagsToAX:
207 mov bx, ROMVARS.wFlags
208 ; Fall to Buffers_GetRomvarsValueToAXfromOffsetInBX
209
210;--------------------------------------------------------------------
211; Buffers_GetRomvarsValueToAXfromOffsetInBX
212; Parameters:
213; BX: ROMVARS offset
214; Returns:
215; AX: Value
216; Corrupts registers:
217; Nothing
218;--------------------------------------------------------------------
219ALIGN JUMP_ALIGN
220Buffers_GetRomvarsValueToAXfromOffsetInBX:
221 push es
222 push di
223 call Buffers_GetFileBufferToESDI
224 mov ax, [es:bx+di]
225 pop di
226 pop es
227 ret
228
229
230;--------------------------------------------------------------------
231; Buffers_GetFileBufferToESDI
232; Buffers_GetFlashComparisonBufferToESDI
233; Buffers_GetFileDialogItemBufferToESDI
234; Parameters:
235; Nothing
236; Returns:
237; ES:DI: Ptr to file buffer
238; Corrupts registers:
239; Nothing
240;--------------------------------------------------------------------
241ALIGN JUMP_ALIGN
242Buffers_GetFlashComparisonBufferToESDI:
243Buffers_GetFileDialogItemBufferToESDI:
244 call Buffers_GetFileBufferToESDI
245 push di
246 mov di, es
247 add di, 1000h ; Third 64k page
248 mov es, di
249 pop di
250 ret
251ALIGN JUMP_ALIGN
252Buffers_GetFileBufferToESDI:
253 mov di, cs
254 add di, 1000h ; Change to next 64k page
255 mov es, di
256 xor di, di ; Ptr now in ES:DI
257 ret
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