|
Last change
on this file since 226 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.
