Last change
on this file since 256 was 181, checked in by krille_n_@…, 13 years ago |
Changes to all parts of the project:
- Size optimizations.
- Added a define (EXCLUDE_FROM_XTIDECFG) to exclude unused library code from XTIDECFG.
- Tried to minimize time spent with interrupts disabled.
- Some minor attempts to improve speed (reordering instructions etc).
- Tried to improve readability, did some cleanup and fixed some errors in comments.
|
File size:
1.5 KB
|
Line | |
---|
1 | ; Project name : Assembly Library
|
---|
2 | ; Description : Functions for register operations.
|
---|
3 |
|
---|
4 |
|
---|
5 | ; Section containing code
|
---|
6 | SECTION .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 | ;--------------------------------------------------------------------
|
---|
19 | %ifndef EXCLUDE_FROM_XTIDECFG ; Not used in XTIDECFG
|
---|
20 | ALIGN JUMP_ALIGN
|
---|
21 | Math_DivQWatSSBPbyCX:
|
---|
22 | xor dx, dx
|
---|
23 | mov ax, [bp+6] ; Load highest divident WORD to DX:AX
|
---|
24 | div cx
|
---|
25 | mov [bp+6], ax ; Store quotient
|
---|
26 |
|
---|
27 | mov ax, [bp+4]
|
---|
28 | div cx
|
---|
29 | mov [bp+4], ax
|
---|
30 |
|
---|
31 | mov ax, [bp+2]
|
---|
32 | div cx
|
---|
33 | mov [bp+2], ax
|
---|
34 |
|
---|
35 | mov ax, [bp]
|
---|
36 | div cx
|
---|
37 | mov [bp], ax
|
---|
38 | ret
|
---|
39 | %endif
|
---|
40 |
|
---|
41 |
|
---|
42 | ;--------------------------------------------------------------------
|
---|
43 | ; Math_DivDXAXbyCX
|
---|
44 | ; Parameters:
|
---|
45 | ; DX:AX: 32-bit unsigned divident
|
---|
46 | ; CX: 16-bit unsigned divisor
|
---|
47 | ; Returns:
|
---|
48 | ; DX:AX: 32-bit unsigned quotient
|
---|
49 | ; BX: 16-bit unsigned remainder
|
---|
50 | ; Corrupts registers:
|
---|
51 | ; Nothing
|
---|
52 | ;--------------------------------------------------------------------
|
---|
53 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG
|
---|
54 | ALIGN JUMP_ALIGN
|
---|
55 | Math_DivDXAXbyCX: ; This is currently unused (dead code)
|
---|
56 | xor bx, bx
|
---|
57 | xchg bx, ax
|
---|
58 | xchg dx, ax
|
---|
59 | div cx
|
---|
60 | xchg ax, bx
|
---|
61 | div cx
|
---|
62 | xchg dx, bx
|
---|
63 | ret
|
---|
64 | %endif
|
---|
Note:
See
TracBrowser
for help on using the repository browser.