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Last change
on this file since 60484 was 60484, checked in by vboxsync, 9 years ago |
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PCBIOS: split up the support.asm file and implemented 32-bit division for pre-386 targets in C using uint32.h (derived from uint128.h via uint64.h).
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File size:
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| 1 | ; $Id: __U8RS.asm 60484 2016-04-14 09:25:51Z 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) 2012-2015 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 __U8RS
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| 23 |
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| 24 |
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| 25 | .8086
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| 26 |
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| 27 | _TEXT segment public 'CODE' use16
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| 28 | assume cs:_TEXT
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| 29 |
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| 30 | ;;
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| 31 | ; 64-bit unsigned right shift.
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| 32 | ;
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| 33 | ; @param ax:bx:cx:dx Value.
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| 34 | ; @param si Shift count.
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| 35 | ; @returns ax:bx:cx:dx Shifted value.
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| 36 | ; si is zeroed
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| 37 | ;
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| 38 | __U8RS:
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| 39 |
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| 40 | test si, si
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| 41 | jz u8rs_quit
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| 42 | u8rs_rot:
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| 43 | shr ax, 1
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| 44 | rcr bx, 1
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| 45 | rcr cx, 1
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| 46 | rcr dx, 1
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| 47 | dec si
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| 48 | jnz u8rs_rot
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| 49 | u8rs_quit:
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| 50 | ret
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| 51 |
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| 52 | _TEXT ends
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| 53 | end
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| 54 |
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