Changeset 4f508e6 in buchla-68k for vlib/vsetav.s

Timestamp:

07/01/2017 02:34:46 PM (7 years ago)

Author:

Thomas Lopatic <thomas@…>

Branches:

master

Children:

08e1da1

Parents:

f40a309

Message:

Converted assembly language files.

File:

• vlib/vsetav.s (modified) (1 diff)

vlib/vsetav.s

@@ -1 @@
-* ------------------------------------------------------------------------------
-* vsetav.s -- set a character's attributes in video RAM
-* Version 1 -- 1988-10-11 -- D.N. Lynx Crowe
-* (c) Copyright 1988 -- D.N. Lynx Crowe
-* ------------------------------------------------------------------------------
-*
-*       vsetav(adr, row, col, atr, len)
-*       unsigned int *adr, row, col, atr, len;
-*
-*               Sets attribute 'atr' at ('row', 'col') in the
-*               full attribute text object at 'adr'
-*               using a line length of 'len'.
-* ------------------------------------------------------------------------------
+| ------------------------------------------------------------------------------
+| vsetav.s -- set a character's attributes in video RAM
+| Version 1 -- 1988-10-11 -- D.N. Lynx Crowe
+| (c) Copyright 1988 -- D.N. Lynx Crowe
+| ------------------------------------------------------------------------------
+
+|       vsetav(adr, row, col, atr, len)
+|       unsigned int |adr, row, col, atr, len;
+
+|               Sets attribute 'atr' at ('row', 'col') in the
+|               full attribute text object at 'adr'
+|               using a line length of 'len'.
+| ------------------------------------------------------------------------------
                 .text
-*
+
                 .xdef   _vsetav
-*
-P_ADR           .equ    8
-P_ROW           .equ    12
-P_COL           .equ    14
-P_ATR           .equ    16
-P_LEN           .equ    18
-*
-_vsetav:        link    a6,#0           * Link stack frame pointer
-                move.w  P_ROW(a6),d0    * Get row
-                mulu    P_LEN(a6),d0    * Multiply by len
-                clr.l   d1              * Clear out d1
-                move.w  P_COL(a6),d1    * Get col
-                add.l   d1,d0           * Add col into d0 to get char. #
-                move.l  d0,d1           * Develop cw = (cn/2)*6 in d1
-                andi.l  #$FFFFFFFE,d1   * ...
-                move.l  d1,d2           * ...
-                add.l   d1,d1           * ...
-                add.l   d2,d1           * ...
-                add.l   P_ADR(a6),d1    * Add sbase to cw
-                movea.l d1,a0           * a0 points at the word with the char.
-                btst.l  #0,d0           * Odd char. location ?
-                bne     vsetav1         * Jump if so
-*
-                addq.l  #2,a0           * Point at the attribute word
-                bra     vsetavx         * Go set attribute
-*
-vsetav1:        addq.l  #4,a0           * Point at the attribute word
-*
-vsetavx:        move.w  P_ATR(a6),d0    * Get new attributes
-                or.w    d0,(a0)         * Set new attributes in video RAM
-                unlk    a6              * Unlink the stack frame
-                rts                     * Return to caller
-*
+
+P_ADR           =       8
+P_ROW           =       12
+P_COL           =       14
+P_ATR           =       16
+P_LEN           =       18
+
+_vsetav:        link    a6,#0           | Link stack frame pointer
+                move.w  P_ROW(a6),d0    | Get row
+                mulu    P_LEN(a6),d0    | Multiply by len
+                clr.l   d1              | Clear out d1
+                move.w  P_COL(a6),d1    | Get col
+                add.l   d1,d0           | Add col into d0 to get char. #
+                move.l  d0,d1           | Develop cw = (cn/2)|6 in d1
+                andi.l  #0xFFFFFFFE,d1  | ...
+                move.l  d1,d2           | ...
+                add.l   d1,d1           | ...
+                add.l   d2,d1           | ...
+                add.l   P_ADR(a6),d1    | Add sbase to cw
+                movea.l d1,a0           | a0 points at the word with the char.
+                btst.l  #0,d0           | Odd char. location ?
+                bne     vsetav1         | Jump if so
+
+                addq.l  #2,a0           | Point at the attribute word
+                bra     vsetavx         | Go set attribute
+
+vsetav1:        addq.l  #4,a0           | Point at the attribute word
+
+vsetavx:        move.w  P_ATR(a6),d0    | Get new attributes
+                or.w    d0,(a0)         | Set new attributes in video RAM
+                unlk    a6              | Unlink the stack frame
+                rts                     | Return to caller
+
                 .end