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Last change
on this file was 57, checked in by Ben Rietbroek, 10 years ago |
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All source-files lowercased [v1.1.1-testing]
Some standard files like 'COPYING', 'LICENSE', etc. have not been
converted to lower case because they are usually distributed uppercased.
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File size:
2.5 KB
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| [30] | 1 | ; AiR-BOOT (c) Copyright 1998-2008 M. Kiewitz
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| 2 | ;
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| 3 | ; This file is part of AiR-BOOT
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| 4 | ;
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| 5 | ; AiR-BOOT is free software: you can redistribute it and/or modify it under
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| 6 | ; the terms of the GNU General Public License as published by the Free
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| 7 | ; Software Foundation, either version 3 of the License, or (at your option)
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| 8 | ; any later version.
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| 9 | ;
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| 10 | ; AiR-BOOT is distributed in the hope that it will be useful, but WITHOUT ANY
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| 11 | ; WARRANTY: without even the implied warranty of MERCHANTABILITY or FITNESS
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| 12 | ; FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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| 13 | ; details.
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| 14 | ;
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| 15 | ; You should have received a copy of the GNU General Public License along with
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| 16 | ; AiR-BOOT. If not, see <http://www.gnu.org/licenses/>.
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| 17 | ;
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| 18 | ;---------------------------------------------------------------------------
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| 19 | ; AiR-BOOT / MATH
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| 20 | ;---------------------------------------------------------------------------
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| 21 |
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| 22 |
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| 23 | ; ----------------------
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| 24 | ; Rousseau: # MATH.ASM #
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| 25 | ; ----------------------
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| 26 | ; This module contains 32-bit multiply.
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| 27 | ; Other math-stuff should be placed here.
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| 28 |
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| 29 |
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| [51] | 30 | IFDEF MODULE_NAMES
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| [30] | 31 | DB 'MATH',0
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| 32 | ENDIF
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| 33 |
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| 34 | ; Multiply two 32-bit operands
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| 35 | ; In: DX:AX - operand 1
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| 36 | ; BX:CX - operand 2
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| 37 | ; Out: BX:CX:DX:AX 64-bit result
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| 38 | MATH_Mul32 Proc Near
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| 39 | local p3:word
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| 40 | local p2:word
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| 41 | local p1:word
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| 42 | local p0:word
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| 43 | local fb1:word
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| 44 | local fb0:word
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| 45 | local fa1:word
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| 46 | local fa0:word
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| 47 |
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| 48 | ; Save parameters
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| 49 | mov [fb1],bx
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| 50 | mov [fb0],cx
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| 51 | mov [fa1],dx
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| 52 | mov [fa0],ax
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| 53 |
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| 54 | ; Clear return value
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| 55 | xor ax,ax
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| 56 | mov [p3],ax
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| 57 | mov [p2],ax
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| 58 | mov [p1],ax
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| 59 | mov [p0],ax
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| 60 |
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| 61 | ; Multiply high words
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| 62 | mov ax,[fa1]
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| 63 | mul [fb1]
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| 64 | mov [p2],ax
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| 65 | mov [p3],dx
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| 66 |
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| 67 | ; Multiply high with low
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| 68 | mov ax,[fa1]
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| 69 | mul [fb0]
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| 70 | add [p1],ax
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| 71 | adc [p2],dx
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| 72 | adc [p3],0
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| 73 |
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| 74 |
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| 75 | ; Multiply low with high
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| 76 | mov ax,[fa0]
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| 77 | mul [fb1]
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| 78 | add [p1],ax
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| 79 | adc [p2],dx
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| 80 | adc [p3],0
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| 81 |
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| 82 | ; Multiply low words
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| 83 | mov ax,[fa0]
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| 84 | mul [fb0]
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| 85 | mov [p0],ax
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| 86 | add [p1],dx
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| 87 | adc [p2],0
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| 88 | adc [p3],0
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| 89 |
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| 90 | ; Return value BX:CX:DX:AX is QWORD result
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| 91 | mov bx,[p3]
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| 92 | mov cx,[p2]
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| 93 | mov dx,[p1]
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| 94 | mov ax,[p0]
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| 95 |
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| 96 | ret
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| 97 | MATH_Mul32 Endp
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