source: xtideuniversalbios/trunk/Assembly_Library/Src/Util/Math.asm@ 173

Last change on this file since 173 was 172, checked in by aitotat@…, 13 years ago

Changes to Assembly Library:

  • Added 32/16bit and 64/16bit division functions.
File size: 1.3 KB
Line 
1; Project name : Assembly Library
2; Description : Functions for register operations.
3
4
5; Section containing code
6SECTION .text
7
8;--------------------------------------------------------------------
9; Math_DivQWatSSBPbyCX
10; Parameters:
11; [SS:BP]: 64-bit unsigned divident
12; CX: 16-bit unsigned divisor
13; Returns:
14; [SS:BP]: 64-bit unsigned quotient
15; DX: 16-bit unsigned remainder
16; Corrupts registers:
17; AX
18;--------------------------------------------------------------------
19ALIGN JUMP_ALIGN
20Math_DivQWatSSBPbyCX:
21 xor dx, dx
22 mov ax, [bp+6] ; Load highest divident WORD to DX:AX
23 div cx
24 mov [bp+6], ax ; Store quotient
25
26 mov ax, [bp+4]
27 div cx
28 mov [bp+4], ax
29
30 mov ax, [bp+2]
31 div cx
32 mov [bp+2], ax
33
34 mov ax, [bp]
35 div cx
36 mov [bp], ax
37 ret
38
39
40;--------------------------------------------------------------------
41; Math_DivDXAXbyCX
42; Parameters:
43; DX:AX: 32-bit unsigned divident
44; CX: 16-bit unsigned divisor
45; Returns:
46; DX:AX: 32-bit unsigned quotient
47; BX: 16-bit unsigned remainder
48; Corrupts registers:
49; Nothing
50;--------------------------------------------------------------------
51ALIGN JUMP_ALIGN
52Math_DivDXAXbyCX:
53 mov bx, ax
54 mov ax, dx
55 xor dx, dx
56 div cx
57 xchg ax, bx
58 div cx
59 xchg dx, bx
60 ret
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