[41] | 1 | ; File name : DisplayContext.asm |
---|
| 2 | ; Project name : Assembly Library |
---|
| 3 | ; Created date : 25.6.2010 |
---|
| 4 | ; Last update : 13.8.2010 |
---|
| 5 | ; Author : Tomi Tilli |
---|
| 6 | ; Description : Functions for managing display context. |
---|
| 7 | |
---|
| 8 | ; Section containing code |
---|
| 9 | SECTION .text |
---|
| 10 | |
---|
| 11 | ;-------------------------------------------------------------------- |
---|
| 12 | ; DisplayContext_Initialize |
---|
| 13 | ; Parameters: |
---|
| 14 | ; DS: BDA segment (zero) |
---|
| 15 | ; Returns: |
---|
| 16 | ; Nothing |
---|
| 17 | ; Corrupts registers: |
---|
| 18 | ; AX, DX, DI |
---|
| 19 | ;-------------------------------------------------------------------- |
---|
| 20 | ALIGN JUMP_ALIGN |
---|
| 21 | DisplayContext_Initialize: |
---|
| 22 | call .DetectAndSetDisplaySegment |
---|
| 23 | mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], DEFAULT_CHARACTER_OUTPUT |
---|
| 24 | mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCursorShape], CURSOR_NORMAL |
---|
| 25 | mov BYTE [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], MONO_NORMAL |
---|
| 26 | |
---|
| 27 | xor ax, ax |
---|
| 28 | call DisplayCursor_SetCoordinatesFromAX |
---|
| 29 | jmp SHORT DisplayContext_SynchronizeToHardware |
---|
| 30 | |
---|
| 31 | ;-------------------------------------------------------------------- |
---|
| 32 | ; .DetectAndSetDisplaySegment |
---|
| 33 | ; Parameters: |
---|
| 34 | ; DS: BDA segment (zero) |
---|
| 35 | ; Returns: |
---|
| 36 | ; Nothing |
---|
| 37 | ; Corrupts registers: |
---|
| 38 | ; Nothing |
---|
| 39 | ;-------------------------------------------------------------------- |
---|
| 40 | .DetectAndSetDisplaySegment: |
---|
| 41 | mov WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], COLOR_TEXT_SEGMENT |
---|
| 42 | cmp BYTE [VIDEO_BDA.bMode], MDA_TEXT_MODE |
---|
| 43 | jne SHORT .Return |
---|
| 44 | sub WORD [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], COLOR_TEXT_SEGMENT - MONO_TEXT_SEGMENT |
---|
| 45 | .Return: |
---|
| 46 | ret |
---|
| 47 | |
---|
| 48 | |
---|
| 49 | ;-------------------------------------------------------------------- |
---|
| 50 | ; DisplayContext_Push |
---|
| 51 | ; Parameters: |
---|
| 52 | ; Nothing |
---|
| 53 | ; Returns: |
---|
| 54 | ; Nothing |
---|
| 55 | ; Corrupts registers: |
---|
| 56 | ; AX, DI |
---|
| 57 | ;-------------------------------------------------------------------- |
---|
| 58 | ALIGN JUMP_ALIGN |
---|
| 59 | DisplayContext_Push: |
---|
| 60 | mov di, ds ; Backup DS |
---|
| 61 | LOAD_BDA_SEGMENT_TO ds, ax |
---|
| 62 | pop ax ; Pop return address |
---|
| 63 | |
---|
| 64 | %assign i 0 |
---|
| 65 | %rep DISPLAY_CONTEXT_size / 2 |
---|
| 66 | push WORD [VIDEO_BDA.displayContext + i] |
---|
| 67 | %assign i i+2 |
---|
| 68 | %endrep |
---|
| 69 | |
---|
| 70 | mov ds, di ; Restore DS |
---|
| 71 | jmp ax |
---|
| 72 | |
---|
| 73 | ;-------------------------------------------------------------------- |
---|
| 74 | ; DisplayContext_Pop |
---|
| 75 | ; Parameters: |
---|
| 76 | ; Nothing |
---|
| 77 | ; Returns: |
---|
| 78 | ; Nothing |
---|
| 79 | ; Corrupts registers: |
---|
| 80 | ; AX, DI |
---|
| 81 | ;-------------------------------------------------------------------- |
---|
| 82 | ALIGN JUMP_ALIGN |
---|
| 83 | DisplayContext_Pop: |
---|
| 84 | mov di, ds ; Backup DS |
---|
| 85 | LOAD_BDA_SEGMENT_TO ds, ax |
---|
| 86 | pop ax ; Pop return address |
---|
| 87 | |
---|
| 88 | %assign i DISPLAY_CONTEXT_size-2 |
---|
| 89 | %rep DISPLAY_CONTEXT_size / 2 |
---|
| 90 | pop WORD [VIDEO_BDA.displayContext + i] |
---|
| 91 | %assign i i-2 |
---|
| 92 | %endrep |
---|
| 93 | |
---|
| 94 | push ax ; Push return address |
---|
| 95 | push dx |
---|
| 96 | call DisplayContext_SynchronizeToHardware |
---|
| 97 | pop dx |
---|
| 98 | mov ds, di ; Restore DS |
---|
| 99 | ret |
---|
| 100 | |
---|
| 101 | |
---|
| 102 | ;-------------------------------------------------------------------- |
---|
| 103 | ; DisplayContext_SynchronizeToHardware |
---|
| 104 | ; Parameters: |
---|
| 105 | ; DS: BDA segment (zero) |
---|
| 106 | ; Returns: |
---|
| 107 | ; Nothing |
---|
| 108 | ; Corrupts registers: |
---|
| 109 | ; AX, DX |
---|
| 110 | ;-------------------------------------------------------------------- |
---|
| 111 | ALIGN JUMP_ALIGN |
---|
| 112 | DisplayContext_SynchronizeToHardware: |
---|
| 113 | call DisplayPage_SynchronizeToHardware |
---|
| 114 | call DisplayCursor_SynchronizeShapeToHardware |
---|
| 115 | jmp DisplayCursor_SynchronizeCoordinatesToHardware |
---|
| 116 | |
---|
| 117 | |
---|
| 118 | ;-------------------------------------------------------------------- |
---|
| 119 | ; DisplayContext_SetCharacterPointerFromBXAX |
---|
| 120 | ; Parameters: |
---|
| 121 | ; BX:AX: Ptr to destination for next character to output |
---|
| 122 | ; DS: BDA segment (zero) |
---|
| 123 | ; Returns: |
---|
| 124 | ; ES:DI: Pointer that was in DX:AX |
---|
| 125 | ; Corrupts registers: |
---|
| 126 | ; AX |
---|
| 127 | ;-------------------------------------------------------------------- |
---|
| 128 | ALIGN JUMP_ALIGN |
---|
| 129 | DisplayContext_SetCharacterPointerFromBXAX: |
---|
| 130 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition], ax |
---|
| 131 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2], bx |
---|
| 132 | xchg di, ax |
---|
| 133 | mov es, bx |
---|
| 134 | ret |
---|
| 135 | |
---|
| 136 | |
---|
| 137 | ;-------------------------------------------------------------------- |
---|
| 138 | ; DisplayContext_GetCharacterPointerToBXAX |
---|
| 139 | ; Parameters: |
---|
| 140 | ; DS: BDA segment (zero) |
---|
| 141 | ; Returns: |
---|
| 142 | ; BX:AX: Ptr to destination for next character to output |
---|
| 143 | ; Corrupts registers: |
---|
| 144 | ; Nothing |
---|
| 145 | ;-------------------------------------------------------------------- |
---|
| 146 | ALIGN JUMP_ALIGN |
---|
| 147 | DisplayContext_GetCharacterPointerToBXAX: |
---|
| 148 | mov ax, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition] |
---|
| 149 | mov bx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fpCursorPosition+2] |
---|
| 150 | ret |
---|
| 151 | |
---|
| 152 | |
---|
| 153 | ;-------------------------------------------------------------------- |
---|
| 154 | ; DisplayContext_SetCharacterOutputFunctionFromAX |
---|
| 155 | ; Parameters: |
---|
| 156 | ; AX: Offset to character output function |
---|
| 157 | ; DS: BDA segment (zero) |
---|
| 158 | ; Returns: |
---|
| 159 | ; Nothing |
---|
| 160 | ; Corrupts registers: |
---|
| 161 | ; Nothing |
---|
| 162 | ;-------------------------------------------------------------------- |
---|
| 163 | ALIGN JUMP_ALIGN |
---|
| 164 | DisplayContext_SetCharacterOutputFunctionFromAX: |
---|
| 165 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.fnCharOut], ax |
---|
| 166 | ret |
---|
| 167 | |
---|
| 168 | |
---|
| 169 | ;-------------------------------------------------------------------- |
---|
| 170 | ; DisplayContext_SetCharacterAttributeFromAL |
---|
| 171 | ; Parameters: |
---|
| 172 | ; AL: Character attribute |
---|
| 173 | ; DS: BDA segment (zero) |
---|
| 174 | ; Returns: |
---|
| 175 | ; Nothing |
---|
| 176 | ; Corrupts registers: |
---|
| 177 | ; Nothing |
---|
| 178 | ;-------------------------------------------------------------------- |
---|
| 179 | ALIGN JUMP_ALIGN |
---|
| 180 | DisplayContext_SetCharacterAttributeFromAL: |
---|
| 181 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.bAttribute], al |
---|
| 182 | ret |
---|
| 183 | |
---|
| 184 | |
---|
| 185 | ;-------------------------------------------------------------------- |
---|
| 186 | ; DisplayContext_SetCharacterOutputParameterFromAX |
---|
| 187 | ; Parameters: |
---|
| 188 | ; AX: Parameter for Character Output function |
---|
| 189 | ; DS: BDA segment (zero) |
---|
| 190 | ; Returns: |
---|
| 191 | ; Nothing |
---|
| 192 | ; Corrupts registers: |
---|
| 193 | ; Nothing |
---|
| 194 | ;-------------------------------------------------------------------- |
---|
| 195 | ALIGN JUMP_ALIGN |
---|
| 196 | DisplayContext_SetCharacterOutputParameterFromAX: |
---|
| 197 | mov [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], ax |
---|
| 198 | ret |
---|
| 199 | |
---|
| 200 | ;-------------------------------------------------------------------- |
---|
| 201 | ; DisplayContext_GetCharacterOutputParameterToDX |
---|
| 202 | ; Parameters: |
---|
| 203 | ; DS: BDA segment (zero) |
---|
| 204 | ; Returns: |
---|
| 205 | ; DX: User parameter for Character Output function |
---|
| 206 | ; Corrupts registers: |
---|
| 207 | ; Nothing |
---|
| 208 | ;-------------------------------------------------------------------- |
---|
| 209 | ALIGN JUMP_ALIGN |
---|
| 210 | DisplayContext_GetCharacterOutputParameterToDX: |
---|
| 211 | mov dx, [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam] |
---|
| 212 | ret |
---|