Changeset 52 in xtideuniversalbios for trunk/Assembly_Library/Src/Display

Timestamp:

Oct 12, 2010, 6:51:07 PM (14 years ago)

Author:

aitotat

google:author:

aitotat

Message:

Changes to Assembly Library:
Completely rewritten line splitting (slower but no need to modify string).
Some changes to string processing functions.
Saved few bytes from CGA detection.

Location:

trunk/Assembly_Library/Src/Display

Files:

• CgaSnow.asm (modified) (3 diffs)
• DisplayContext.asm (modified) (3 diffs)
• DisplayPrint.asm (modified) (2 diffs)

trunk/Assembly_Library/Src/Display/CgaSnow.asm

@@ -2 +2 @@
 ; Project name  :   Assembly Library
 ; Created date  :   8.10.2010
-; Last update   :   9.10.2010
+; Last update   :   12.10.2010
 ; Author        :   Tomi Tilli
 ; Description   :   Functions for preventing CGA snow.
@@ -23 +23 @@
     cmp     WORD [BDA.wVidPort], CGA_STATUS_REGISTER - OFFSET_TO_CGA_STATUS_REGISTER
     jne     SHORT .CgaNotFound
-    call    DisplayPage_GetColumnsToALandRowsToAH
-    cmp     ah, [BDA.bVidRows]      ; Video rows stored only by EGA and later
-    je      SHORT .CgaNotFound      ; Must be EGA or later
+
+    ; All standard CGA modes use 25 rows but only EGA and later store it to BDA.
+    cmp     BYTE [BDA.bVidRows], 25
+    jge     SHORT .CgaNotFound
     stc
     ret
@@ -83 +84 @@
 
 ;--------------------------------------------------------------------
-; CgaSnow_Scasb
-;   Parameters:
-;       AL:     Byte for comparison
-;       DS:     BDA segment (zero)
-;       ES:DI:  Ptr to video memory where to output
-;   Returns:
-;       DI:     Incremented for next character
-;   Corrupts registers:
-;       AX, DX
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-CgaSnow_Scasb:
-    call    LoadCgaStatusRegisterAddressToDXifCgaPresent
-    jz      SHORT .ScasbWithoutWaitSinceUnknownPort
-
-    mov     ah, al
-    cli             ; Interrupt request would mess up timing
-    WAIT_UNTIL_SAFE_CGA_WRITE
-    mov     al, ah
-.ScasbWithoutWaitSinceUnknownPort:
-    scasb
-    sti
-    ret
-
-
-;--------------------------------------------------------------------
 ; CgaSnow_RepMovsb
 ;   Parameters:

trunk/Assembly_Library/Src/Display/DisplayContext.asm

@@ -2 +2 @@
 ; Project name  :   Assembly Library
 ; Created date  :   25.6.2010
-; Last update   :   9.10.2010
+; Last update   :   11.10.2010
 ; Author        :   Tomi Tilli
 ; Description   :   Functions for managing display context.
@@ -119 +119 @@
 
 ;--------------------------------------------------------------------
-; DisplayContext_PrepareOffScreenBufferInESBXtoESDI
-;   Parameters:
-;       BX:AX:  Ptr to off screen buffer
-;   Returns:
-;       Nothing
-;   Corrupts registers:
-;       AX
-;--------------------------------------------------------------------
-ALIGN JUMP_ALIGN
-DisplayContext_PrepareOffScreenBufferInESBXtoESDI:
+; DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX
+;   Parameters:
+;       CX:     Off screen buffer length in characters
+;       ES:BX:  Ptr to off screen buffer
+;   Returns:
+;       Nothing
+;   Corrupts registers:
+;       AX, DI
+;--------------------------------------------------------------------
+ALIGN JUMP_ALIGN
+DisplayContext_PrepareOffScreenBufferInESBXwithLengthInCX:
     push    ds
 
@@ -139 +140 @@
     mov     ax, BUFFER_OUTPUT_WITH_CHAR_ONLY
     call    DisplayContext_SetCharOutputFunctionFromAXwithAttribFlagInBL
+    mov     [VIDEO_BDA.displayContext+DISPLAY_CONTEXT.wCharOutParam], cx
 
     mov     bx, di

trunk/Assembly_Library/Src/Display/DisplayPrint.asm

@@ -2 +2 @@
 ; Project name  :   Assembly Library
 ; Created date  :   26.6.2010
-; Last update   :   27.9.2010
+; Last update   :   11.10.2010
 ; Author        :   Tomi Tilli
 ; Description   :   Functions for display output.
@@ -326 +326 @@
 ALIGN JUMP_ALIGN
 DisplayPrint_Newline:
+    mov     al, LF
+    call    DisplayPrint_CharacterFromAL
     mov     al, CR
-    call    DisplayPrint_CharacterFromAL
-    mov     al, LF
     ; Fall to DisplayPrint_CharacterFromAL
-
 
 ;--------------------------------------------------------------------