source: xtideuniversalbios/trunk/XTIDE_Universal_BIOS_Configurator_v2/Src/Buffers.asm@ 58

Last change on this file since 58 was 57, checked in by Tomi Tilli, 14 years ago

Initial commit (Work in progress).
File size: 6.6 KB
Line 
1; File name : Buffers.asm
2; Project name : XTIDE Universal BIOS Configurator v2
3; Created date : 6.10.2010
4; Last update : 10.10.2010
5; Author : Tomi Tilli
6; Description : Functions for accessing file and flash buffers.
7
8; Section containing code
9SECTION .text
10
11;--------------------------------------------------------------------
12; Buffers_Clear
13; Parameters:
14; Nothing
15; Returns:
16; Nothing
17; Corrupts registers:
18; AX, CX, DI, ES
19;--------------------------------------------------------------------
20ALIGN JUMP_ALIGN
21Buffers_Clear:
22 call Buffers_GetFileBufferToESDI
23 mov cx, ROMVARS_size
24 jmp Memory_ZeroESDIwithSizeInCX
25
26
27;--------------------------------------------------------------------
28; Buffers_IsXtideUniversalBiosLoaded
29; Parameters:
30; Nothing
31; Returns:
32; ZF: Set if supported version of XTIDE Universal BIOS is loaded
33; Cleared no file or some other file is loaded
34; Corrupts registers:
35; CX, SI, DI, ES
36;--------------------------------------------------------------------
37ALIGN JUMP_ALIGN
38Buffers_IsXtideUniversalBiosLoaded:
39 test WORD [cs:g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED
40 jz SHORT .NoFileOrBiosLoaded
41
42 call Buffers_GetFileBufferToESDI
43 jmp SHORT Buffers_IsXtideUniversalBiosSignatureInESDI
44.NoFileOrBiosLoaded:
45 or cl, 1 ; Clear ZF
46 ret
47
48
49;--------------------------------------------------------------------
50; Buffers_IsXtideUniversalBiosSignatureInESDI
51; Parameters:
52; ES:DI: Ptr to possible XTIDE Universal BIOS location
53; Returns:
54; ZF: Set if supported version of XTIDE Universal BIOS is loaded
55; Cleared no file or some other file is loaded
56; Corrupts registers:
57; CX, SI
58;--------------------------------------------------------------------
59ALIGN JUMP_ALIGN
60Buffers_IsXtideUniversalBiosSignatureInESDI:
61 push di
62
63 mov si, g_szXtideUniversalBiosSignature
64 add di, BYTE ROMVARS.rgbSign
65 mov cx, XTIDE_SIGNATURE_LENGTH / 2
66 cld
67 eSEG_STR repe, cs, cmpsw
68
69 pop di
70 ret
71
72
73;--------------------------------------------------------------------
74; Buffers_NewBiosWithSizeInCXandSourceInAXhasBeenLoadedForConfiguration
75; Parameters:
76; AX: EEPROM source (FLG_CFGVARS_FILELOADED or FLG_CFGVARS_ROMLOADED)
77; CX: EEPROM size in bytes
78; Returns:
79; Nothing
80; Corrupts registers:
81; AX, BX, CX, DX
82;--------------------------------------------------------------------
83ALIGN JUMP_ALIGN
84Buffers_NewBiosWithSizeInCXandSourceInAXhasBeenLoadedForConfiguration:
85 and WORD [cs:g_cfgVars+CFGVARS.wFlags], ~(FLG_CFGVARS_FILELOADED | FLG_CFGVARS_ROMLOADED | FLG_CFGVARS_UNSAVED)
86 or WORD [cs:g_cfgVars+CFGVARS.wFlags], ax
87 ; Fall to .AdjustBiosImageSizeToSupportedEepromSize
88
89;--------------------------------------------------------------------
90; .AdjustBiosImageSizeInCXtoSupportedEepromSize
91; Parameters:
92; CX: Size of loaded BIOS image
93; Returns:
94; CX: Size of BIOS image (and EEPROM required)
95; Corrupts registers:
96; AX, BX, DX
97;--------------------------------------------------------------------
98.AdjustBiosImageSizeInCXtoSupportedEepromSize:
99 mov bx, .rgwSupportedEepromSizes
100 mov dx, NUMBER_OF_SUPPORTED_EEPROM_SIZES-1
101ALIGN JUMP_ALIGN
102.CheckNextEepromSize:
103 cmp cx, [cs:bx]
104 je SHORT .StoreImageSizeFromCX
105 jb SHORT .AppendZeroesToTheEndOfBuffer
106 inc bx
107 inc bx
108 dec dx
109 jnz SHORT .CheckNextEepromSize
110 xor cx, cx
111 jmp SHORT .StoreImageSizeFromCX ; 0 = 65536
112ALIGN WORD_ALIGN
113.rgwSupportedEepromSizes:
114 dw 4<<10
115 dw 8<<10
116 dw 16<<10
117 dw 32<<10
118
119;--------------------------------------------------------------------
120; .AppendZeroesToTheEndOfBuffer
121; Parameters:
122; CX: Size of loaded BIOS image
123; CS:BX: Ptr to EEPROM size
124; Returns:
125; CX: EEPROM size
126; Corrupts registers:
127; AX
128;--------------------------------------------------------------------
129ALIGN JUMP_ALIGN
130.AppendZeroesToTheEndOfBuffer:
131 push es
132 push di
133
134 call Buffers_GetFileBufferToESDI
135 mov ax, [cs:bx]
136 sub ax, cx ; AX = zeroes to append
137 xchg ax, cx ; AX = BIOS image size, CX = zeroes to append
138 add di, ax
139 call Memory_ZeroESDIwithSizeInCX
140 mov cx, [cs:bx]
141
142 pop di
143 pop es
144 ; Fall to .StoreImageSizeFromCX
145
146;--------------------------------------------------------------------
147; .StoreImageSizeFromCX
148; Parameters:
149; CX: Size of BIOS image (and EEPROM required)
150; Returns:
151; Nothing
152; Corrupts registers:
153; Nothing
154;--------------------------------------------------------------------
155ALIGN JUMP_ALIGN
156.StoreImageSizeFromCX:
157 mov [cs:g_cfgVars+CFGVARS.wImageSize], cx
158 ret
159
160
161;--------------------------------------------------------------------
162; Buffers_SetUnsavedChanges
163; Buffers_ClearUnsavedChanges
164; Parameters:
165; SS:BP: Menu handle
166; Returns:
167; Nothing
168; Corrupts registers:
169; Nothing
170;--------------------------------------------------------------------
171ALIGN JUMP_ALIGN
172Buffers_SetUnsavedChanges:
173 or WORD [g_cfgVars+CFGVARS.wFlags], FLG_CFGVARS_UNSAVED
174 ret
175
176ALIGN JUMP_ALIGN
177Buffers_ClearUnsavedChanges:
178 and WORD [g_cfgVars+CFGVARS.wFlags], ~FLG_CFGVARS_UNSAVED
179 ret
180
181
182;--------------------------------------------------------------------
183; Buffers_GenerateChecksum
184; Parameters:
185; Nothing
186; Returns:
187; Nothing
188; Corrupts registers:
189; AX, BX, CX, DI
190;--------------------------------------------------------------------
191ALIGN JUMP_ALIGN
192Buffers_GenerateChecksum:
193 push es
194
195 call Buffers_GetFileBufferToESDI
196 mov cx, [cs:g_cfgVars+CFGVARS.wImageSize]
197 dec cx ; Leave space for checksum byte
198 xor ax, ax
199ALIGN JUMP_ALIGN
200.SumNextByte:
201 add al, [es:di]
202 inc di
203 loop .SumNextByte
204 neg al
205 mov [es:di], al
206
207 pop es
208 ret
209
210
211;--------------------------------------------------------------------
212; Buffers_GetRomvarsValueToAXfromOffsetInBX
213; Parameters:
214; BX: ROMVARS offset
215; Returns:
216; AX: Value
217; Corrupts registers:
218; Nothing
219;--------------------------------------------------------------------
220ALIGN JUMP_ALIGN
221Buffers_GetRomvarsValueToAXfromOffsetInBX:
222 push es
223 push di
224 call Buffers_GetFileBufferToESDI
225 mov ax, [es:bx+di]
226 pop di
227 pop es
228 ret
229
230
231;--------------------------------------------------------------------
232; Buffers_GetFileBufferToESDI
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_GetFileDialogItemBufferToESDI:
243Buffers_GetFileBufferToESDI:
244 mov di, cs
245 add di, 1000h ; Change to next 64k page
246 mov es, di
247 xor di, di ; Ptr now in ES:DI
248 ret
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