68 lines
2.4 KiB
C
68 lines
2.4 KiB
C
/* $NetBSD: rnd.h,v 1.1 2000/06/08 02:19:20 thorpej Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2000 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to The NetBSD Foundation
|
|
* by Jason R. Thorpe.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the NetBSD
|
|
* Foundation, Inc. and its contributors.
|
|
* 4. Neither the name of The NetBSD Foundation nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#ifndef _ALPHA_RND_H_
|
|
#define _ALPHA_RND_H_
|
|
|
|
/*
|
|
* Machine-specific support for rnd(4)
|
|
*/
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#include <machine/alpha_cpu.h>
|
|
|
|
/* Process Cycle Counter is always available. */
|
|
#define cpu_hascounter() (1)
|
|
|
|
static __inline u_int32_t
|
|
cpu_counter(void)
|
|
{
|
|
|
|
/*
|
|
* Only the lower 32 bits of the PCC are an actual cycle
|
|
* counter. Thankfully, the rnd(4) code only wants a
|
|
* 32-bit value anyway.
|
|
*/
|
|
return (alpha_rpcc() & 0xffffffffU);
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* !_ALPHA_RND_H_ */
|