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Last change
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scm --update-copyright-year
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Author Date Id Revision
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File size:
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| 1 | ; $Id: __I4M.asm 93115 2022-01-01 11:31:46Z vboxsync $
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| 2 | ;; @file
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| 3 | ; Compiler support routines.
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| 4 | ;
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| 5 |
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| 6 | ;
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| 7 | ; Copyright (C) 2012-2022 Oracle Corporation
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| 8 | ;
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| 9 | ; This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | ; available from http://www.virtualbox.org. This file is free software;
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| 11 | ; you can redistribute it and/or modify it under the terms of the GNU
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| 12 | ; General Public License (GPL) as published by the Free Software
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| 13 | ; Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | ; VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | ; hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | ;
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| 17 |
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| 18 |
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| 19 | ;*******************************************************************************
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| 20 | ;* Exported Symbols *
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| 21 | ;*******************************************************************************
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| 22 | public __I4M
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| 23 |
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| 24 | if VBOX_BIOS_CPU lt 80386
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| 25 | extrn NeedToImplementOn8086__I4M:near
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| 26 | endif
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| 27 |
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| 28 | ; MASM (ML.EXE) is used for PXE and no longer understands the .8086 directive.
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| 29 | ; WASM is used for the BIOS and understands it just fine.
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| 30 | ifdef __WASM__
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| 31 | .8086
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| 32 | endif
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| 33 |
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| 34 | _TEXT segment public 'CODE' use16
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| 35 | assume cs:_TEXT
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| 36 |
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| 37 | ;;
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| 38 | ; 32-bit signed multiplication.
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| 39 | ;
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| 40 | ; @param dx:ax Factor 1.
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| 41 | ; @param cx:bx Factor 2.
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| 42 | ; @returns dx:ax Result.
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| 43 | ; cx, es may be modified; di is preserved
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| 44 | ;
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| 45 | __I4M:
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| 46 | pushf
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| 47 | if VBOX_BIOS_CPU ge 80386
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| 48 | .386
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| 49 | push eax
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| 50 | push edx
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| 51 | push ecx
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| 52 | push ebx
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| 53 |
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| 54 | rol eax, 16
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| 55 | mov ax, dx
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| 56 | ror eax, 16
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| 57 | xor edx, edx
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| 58 |
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| 59 | shr ecx, 16
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| 60 | mov cx, bx
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| 61 |
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| 62 | imul ecx ; eax * ecx -> edx:eax
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| 63 |
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| 64 | pop ebx
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| 65 | pop ecx
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| 66 |
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| 67 | pop edx
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| 68 | ror eax, 16
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| 69 | mov dx, ax
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| 70 | add sp, 2
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| 71 | pop ax
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| 72 | rol eax, 16
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| 73 | ifdef __WASM__
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| 74 | .8086
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| 75 | endif
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| 76 |
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| 77 | else
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| 78 | call NeedToImplementOn8086__I4M
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| 79 | endif
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| 80 |
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| 81 | popf
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| 82 | ret
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| 83 |
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| 84 |
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| 85 | _TEXT ends
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| 86 | end
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| 87 |
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