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Last change
on this file since 174 was
174,
checked in by krille_n_@…, 13 years ago
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Changes to XTIDE Universal BIOS:
- Excluded the Math_DivDXAXbyCX procedure as it is currently unused. Also made it 2 bytes smaller.
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File size:
1.4 KB
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| 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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| 19 | ALIGN JUMP_ALIGN |
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| 20 | Math_DivQWatSSBPbyCX: ; This procedure is included but not used in XTIDECFG |
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| 21 | xor dx, dx |
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| 22 | mov ax, [bp+6] ; Load highest divident WORD to DX:AX |
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| 23 | div cx |
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| 24 | mov [bp+6], ax ; Store quotient |
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| 25 | |
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| 26 | mov ax, [bp+4] |
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| 27 | div cx |
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| 28 | mov [bp+4], ax |
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| 29 | |
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| 30 | mov ax, [bp+2] |
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| 31 | div cx |
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| 32 | mov [bp+2], ax |
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| 33 | |
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| 34 | mov ax, [bp] |
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| 35 | div cx |
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| 36 | mov [bp], ax |
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| 37 | ret |
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| 38 | |
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| 39 | |
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| 40 | ;-------------------------------------------------------------------- |
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| 41 | ; Math_DivDXAXbyCX |
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| 42 | ; Parameters: |
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| 43 | ; DX:AX: 32-bit unsigned divident |
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| 44 | ; CX: 16-bit unsigned divisor |
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| 45 | ; Returns: |
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| 46 | ; DX:AX: 32-bit unsigned quotient |
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| 47 | ; BX: 16-bit unsigned remainder |
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| 48 | ; Corrupts registers: |
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| 49 | ; Nothing |
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| 50 | ;-------------------------------------------------------------------- |
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| 51 | %ifndef EXCLUDE_FROM_XTIDE_UNIVERSAL_BIOS |
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| 52 | ALIGN JUMP_ALIGN |
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| 53 | Math_DivDXAXbyCX: ; This procedure is included but not used in XTIDECFG |
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| 54 | xor bx, bx |
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| 55 | xchg bx, ax |
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| 56 | xchg dx, ax |
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| 57 | div cx |
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| 58 | xchg ax, bx |
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| 59 | div cx |
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| 60 | xchg dx, bx |
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| 61 | ret |
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| 62 | %endif |
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