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Last change
on this file since 202 was 181, checked in by krille_n_@…, 13 years ago |
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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.
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File size:
1.5 KB
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| [172] | 1 | ; Project name : Assembly Library
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| 2 | ; Description : Functions for register operations.
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| 3 |
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| 4 |
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| 5 | ; Section containing code
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| 6 | SECTION .text
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| 7 |
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| 8 | ;--------------------------------------------------------------------
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| 9 | ; Math_DivQWatSSBPbyCX
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| 10 | ; Parameters:
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| 11 | ; [SS:BP]: 64-bit unsigned divident
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| 12 | ; CX: 16-bit unsigned divisor
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| 13 | ; Returns:
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| 14 | ; [SS:BP]: 64-bit unsigned quotient
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| 15 | ; DX: 16-bit unsigned remainder
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| 16 | ; Corrupts registers:
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| 17 | ; AX
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| 18 | ;--------------------------------------------------------------------
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| [181] | 19 | %ifndef EXCLUDE_FROM_XTIDECFG ; Not used in XTIDECFG
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| [172] | 20 | ALIGN JUMP_ALIGN
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| [181] | 21 | Math_DivQWatSSBPbyCX:
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| [172] | 22 | xor dx, dx
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| 23 | mov ax, [bp+6] ; Load highest divident WORD to DX:AX
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| 24 | div cx
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| 25 | mov [bp+6], ax ; Store quotient
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| 26 |
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| 27 | mov ax, [bp+4]
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| 28 | div cx
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| 29 | mov [bp+4], ax
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| 30 |
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| 31 | mov ax, [bp+2]
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| 32 | div cx
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| 33 | mov [bp+2], ax
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| 34 |
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| 35 | mov ax, [bp]
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| 36 | div cx
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| 37 | mov [bp], ax
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| 38 | ret
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| [181] | 39 | %endif
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| [172] | 40 |
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| 41 |
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| 42 | ;--------------------------------------------------------------------
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| 43 | ; Math_DivDXAXbyCX
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| 44 | ; Parameters:
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| 45 | ; DX:AX: 32-bit unsigned divident
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| 46 | ; CX: 16-bit unsigned divisor
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| 47 | ; Returns:
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| 48 | ; DX:AX: 32-bit unsigned quotient
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| 49 | ; BX: 16-bit unsigned remainder
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| 50 | ; Corrupts registers:
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| 51 | ; Nothing
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| 52 | ;--------------------------------------------------------------------
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| [181] | 53 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS OR EXCLUDE_FROM_XTIDECFG
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| [172] | 54 | ALIGN JUMP_ALIGN
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| [181] | 55 | Math_DivDXAXbyCX: ; This is currently unused (dead code)
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| [174] | 56 | xor bx, bx
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| 57 | xchg bx, ax
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| 58 | xchg dx, ax
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| [172] | 59 | div cx
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| 60 | xchg ax, bx
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| 61 | div cx
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| 62 | xchg dx, bx
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| 63 | ret
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| [174] | 64 | %endif
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