forked from KolibriOS/kolibrios
76 lines
1.6 KiB
PHP
76 lines
1.6 KiB
PHP
; C4
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; Copyright (c) 2002 Thomas Mathys
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; killer@vantage.ch
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;
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; This file is part of C4.
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;
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; C4 is free software; you can redistribute it and/or modify
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; it under the terms of the GNU General Public License as published by
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; the Free Software Foundation; either version 2 of the License, or
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; (at your option) any later version.
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;
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; C4 is distributed in the hope that it will be useful,
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; but WITHOUT ANY WARRANTY; without even the implied warranty of
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; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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; GNU General Public License for more details.
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;
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; You should have received a copy of the GNU General Public License
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; along with C4; if not, write to the Free Software
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; Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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%ifndef _RNG_INC
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%define _RNG_INC
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section .data
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; random seed
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seed dd 0
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section .text
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;**********************************************************
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; randomize
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; initialize random number generator.
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; initialization is done using the get system clock syscall
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;
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; input : nothing
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; output : nothing
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; destroys : nothing
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;**********************************************************
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randomize:
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push eax
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mov eax,MOS_SC_GETSYSCLOCK
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int 0x40
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mov [seed],eax
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pop eax
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ret
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;**********************************************************
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; rand
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; return an unsigned 32 bit "random" number
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;
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; input : nothing
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; output : eax = unsigned 32 bit random number
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; destroys : nothing
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;**********************************************************
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rand:
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pushfd
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push edx
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mov eax,32719
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mul dword [seed]
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add eax,123
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xchg al,ah
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rol eax,16
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xchg al,ah
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mov [seed],eax
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pop edx
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popfd
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ret
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%endif
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