source: xtideuniversalbios/trunk/Assembly_Library/Src/Display/DisplayContext.asm@ 280

Last change on this file since 280 was 201, checked in by gregli@…, 13 years ago

Fixed up conditional compilation so that we can continue to build without string compression.

File size: 9.7 KB
RevLine 
[41]1; Project name : Assembly Library
2; Description : Functions for managing display context.
3
4; Section containing code
5SECTION .text
6
7;--------------------------------------------------------------------
8; DisplayContext_Initialize
9; Parameters:
10; DS: BDA segment (zero)
11; Returns:
12; Nothing
13; Corrupts registers:
14; AX, DX, DI
15;--------------------------------------------------------------------
16ALIGN JUMP_ALIGN
17DisplayContext_Initialize:
18 mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], DEFAULT_CHARACTER_OUTPUT
19 mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], CURSOR_NORMAL
[44]20 mov BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], SCREEN_BACKGROUND_ATTRIBUTE
[101]21 ; Fall to .DetectAndSetDisplaySegment
[41]22
23;--------------------------------------------------------------------
24; .DetectAndSetDisplaySegment
25; Parameters:
26; DS: BDA segment (zero)
27; Returns:
28; Nothing
29; Corrupts registers:
[50]30; AX, DX
[41]31;--------------------------------------------------------------------
32.DetectAndSetDisplaySegment:
[50]33 mov ax, COLOR_TEXT_SEGMENT
[41]34 cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE
[101]35 eCMOVE ah, MONO_TEXT_SEGMENT >> 8
[50]36 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], ax
[101]37 ; Fall to .InitializeFlags
[50]38
39;--------------------------------------------------------------------
40; .InitializeFlags
41; Parameters:
42; DS: BDA segment (zero)
43; Returns:
44; Nothing
45; Corrupts registers:
46; AX, DX
47;--------------------------------------------------------------------
48.InitializeFlags:
49 mov dl, FLG_CONTEXT_ATTRIBUTES
50 call CgaSnow_IsCgaPresent
51 jnc SHORT .DoNotSetCgaFlag
52 or dl, FLG_CONTEXT_CGA
53.DoNotSetCgaFlag:
54 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], dl
[101]55 ; Fall to .InitializeCursor
[41]56
[101]57;--------------------------------------------------------------------
58; .InitializeCursor
59; Parameters:
60; DS: BDA segment (zero)
61; Returns:
62; Nothing
63; Corrupts registers:
64; AX, DX
65;--------------------------------------------------------------------
66.InitializeCursor:
[115]67 call DisplayCursor_GetHardwareCoordinatesToAX ; Coordinates before init
68 call DisplayCursor_SetCoordinatesFromAX ; Cursor to Display Context
[101]69 ; Fall to DisplayContext_SynchronizeToHardware
[41]70
71;--------------------------------------------------------------------
[101]72; DisplayContext_SynchronizeToHardware
73; Parameters:
74; DS: BDA segment (zero)
75; Returns:
76; Nothing
77; Corrupts registers:
78; AX, DX
79;--------------------------------------------------------------------
80ALIGN JUMP_ALIGN
81DisplayContext_SynchronizeToHardware:
82 call DisplayPage_SynchronizeToHardware
83 call DisplayCursor_SynchronizeShapeToHardware
84 jmp DisplayCursor_SynchronizeCoordinatesToHardware
85
86
87;--------------------------------------------------------------------
[41]88; DisplayContext_Push
89; Parameters:
90; Nothing
91; Returns:
92; Nothing
93; Corrupts registers:
94; AX, DI
95;--------------------------------------------------------------------
96ALIGN JUMP_ALIGN
97DisplayContext_Push:
98 mov di, ds ; Backup DS
99 LOAD_BDA_SEGMENT_TO ds, ax
100 pop ax ; Pop return address
101
[194]102%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]103 %assign i 0
104 %rep DISPLAY_CONTEXT_size / 2
105 push WORD [VIDEO_BDA.displayContext + i]
106 %assign i i+2
107 %endrep
[194]108%endif
109
[41]110 mov ds, di ; Restore DS
111 jmp ax
112
113;--------------------------------------------------------------------
114; DisplayContext_Pop
115; Parameters:
116; Nothing
117; Returns:
118; Nothing
119; Corrupts registers:
120; AX, DI
121;--------------------------------------------------------------------
122ALIGN JUMP_ALIGN
123DisplayContext_Pop:
124 mov di, ds ; Backup DS
125 LOAD_BDA_SEGMENT_TO ds, ax
126 pop ax ; Pop return address
127
[194]128%ifndef CHECK_FOR_UNUSED_ENTRYPOINTS
[41]129 %assign i DISPLAY_CONTEXT_size-2
130 %rep DISPLAY_CONTEXT_size / 2
131 pop WORD [VIDEO_BDA.displayContext + i]
132 %assign i i-2
133 %endrep
[194]134%endif
135
[41]136 push ax ; Push return address
137 push dx
138 call DisplayContext_SynchronizeToHardware
139 pop dx
140 mov ds, di ; Restore DS
141 ret
142
143
144;--------------------------------------------------------------------
[52]145; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX
[48]146; Parameters:
[52]147; CX: Off screen buffer length in characters
148; ES:BX: Ptr to off screen buffer
[48]149; Returns:
150; Nothing
151; Corrupts registers:
[52]152; AX, DI
[48]153;--------------------------------------------------------------------
[133]154%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[48]155ALIGN JUMP_ALIGN
[52]156DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX:
[48]157 push ds
158
159 LOAD_BDA_SEGMENT_TO ds, di
160 xchg ax, bx
161 mov bx, es
162 call DisplayContext_SetCharacterPointerFromBXAX ; ES:DI now has the pointer
163
164 mov bl, ATTRIBUTES_NOT_USED
165 mov ax, BUFFER_OUTPUT_WITH_CHAR_ONLY
166 call DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[52]167 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx
[48]168
169 mov bx, di
170 pop ds
171 ret
[133]172%endif
[48]173
174
175;--------------------------------------------------------------------
[41]176; DisplayContext_SetCharacterPointerFromBXAX
177; Parameters:
178; BX:AX: Ptr to destination for next character to output
179; DS: BDA segment (zero)
180; Returns:
[48]181; ES:DI: Pointer that was in BX:AX
[41]182; Corrupts registers:
183; AX
184;--------------------------------------------------------------------
[133]185%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[41]186ALIGN JUMP_ALIGN
187DisplayContext_SetCharacterPointerFromBXAX:
188 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax
189 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx
190 xchg di, ax
191 mov es, bx
192 ret
[133]193%endif
[41]194
195
196;--------------------------------------------------------------------
197; DisplayContext_GetCharacterPointerToBXAX
198; Parameters:
199; DS: BDA segment (zero)
200; Returns:
201; BX:AX: Ptr to destination for next character to output
202; Corrupts registers:
203; Nothing
204;--------------------------------------------------------------------
[133]205%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS
[41]206ALIGN JUMP_ALIGN
207DisplayContext_GetCharacterPointerToBXAX:
208 mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition]
209 mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2]
210 ret
[133]211%endif
[41]212
213
214;--------------------------------------------------------------------
[45]215; DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
[41]216; Parameters:
217; AX: Offset to character output function
[45]218; BL: Attribute Flag
[41]219; DS: BDA segment (zero)
220; Returns:
221; Nothing
222; Corrupts registers:
[50]223; BL
[41]224;--------------------------------------------------------------------
225ALIGN JUMP_ALIGN
[45]226DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL:
[50]227 and bl, FLG_CONTEXT_ATTRIBUTES
228 and BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], ~FLG_CONTEXT_ATTRIBUTES
229 or [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], bl
[41]230 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax
231 ret
[194]232
[41]233
234;--------------------------------------------------------------------
235; DisplayContext_SetCharacterAttributeFromAL
236; Parameters:
237; AL: Character attribute
238; DS: BDA segment (zero)
239; Returns:
240; Nothing
241; Corrupts registers:
242; Nothing
243;--------------------------------------------------------------------
244ALIGN JUMP_ALIGN
245DisplayContext_SetCharacterAttributeFromAL:
246 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al
247 ret
248
249
250;--------------------------------------------------------------------
251; DisplayContext_SetCharacterOutputParameterFromAX
252; Parameters:
253; AX: Parameter for Character Output function
254; DS: BDA segment (zero)
255; Returns:
256; Nothing
257; Corrupts registers:
258; Nothing
259;--------------------------------------------------------------------
260ALIGN JUMP_ALIGN
261DisplayContext_SetCharacterOutputParameterFromAX:
262 mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax
263 ret
264
[194]265
[41]266;--------------------------------------------------------------------
267; DisplayContext_GetCharacterOutputParameterToDX
268; Parameters:
269; DS: BDA segment (zero)
270; Returns:
271; DX: User parameter for Character Output function
272; Corrupts registers:
273; Nothing
[133]274;--------------------------------------------------------------------
[181]275%ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG ; This is currently unused (dead code)
276ALIGN JUMP_ALIGN
277DisplayContext_GetCharacterOutputParameterToDX:
278 mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam]
279 ret
280%endif
[44]281
282
283;--------------------------------------------------------------------
284; DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX
285; Parameters:
286; AX: Offset in bytes from some character to another
287; DS: BDA segment (zero)
288; Returns:
289; AX: Offset in characters from some character to another
290; Corrupts registers:
291; Nothing
[133]292;--------------------------------------------------------------------
[201]293%ifndef MODULE_STRINGS_COMPRESSED
[44]294ALIGN JUMP_ALIGN
295DisplayContext_GetCharacterOffsetToAXfromByteOffsetInAX:
296 test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
297 jz SHORT ReturnOffsetInAX
298 sar ax, 1 ; BYTE count to WORD count
299 ret
[194]300%endif
[44]301
[194]302
[44]303;--------------------------------------------------------------------
304; DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX
305; Parameters:
306; AX: Offset in characters from some character to another
307; DS: BDA segment (zero)
308; Returns:
309; AX: Offset in bytes from some character to another
310; Corrupts registers:
311; Nothing
[133]312;--------------------------------------------------------------------
[201]313%ifndef MODULE_STRINGS_COMPRESSED
[44]314ALIGN JUMP_ALIGN
315DisplayContext_GetByteOffsetToAXfromCharacterOffsetInAX:
316 test BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bFlags], FLG_CONTEXT_ATTRIBUTES
317 jz SHORT ReturnOffsetInAX
318 sal ax, 1 ; WORD count to BYTE count
319ALIGN JUMP_ALIGN, ret
320ReturnOffsetInAX:
321 ret
[194]322%endif
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