72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
/* $NetBSD: rnd.h,v 1.2 2002/03/26 21:50:39 kleink Exp $ */
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/*-
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* Copyright (c) 2000 Tsubai Masanari. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _POWERPC_RND_H_
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#define _POWERPC_RND_H_
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/*
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* Machine-specific support for rnd(4)
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*/
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#ifdef _KERNEL
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#include <powerpc/spr.h>
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#define cpu_hascounter() 1
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static __inline u_int32_t
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cpu_counter(void)
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{
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u_int32_t rv, rtcu, scratch;
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__asm __volatile (
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"mfpvr %0 \n"
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"srwi %0,%0,16 \n"
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"cmpwi %0,%3 \n"
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"bne 1f \n" /* branch if 601 */
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"lis %0,0x77 \n"
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"ori %0,%0,0x3594 \n" /* 7.8125e6 */
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"mfspr %2,%4 \n"
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"mullw %2,%2,%0 \n"
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"mfspr %0,%5 \n"
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"srwi %0,%0,7 \n"
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"add %1,%2,%0 \n"
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"b 2f \n"
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"1: \n"
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"mftb %1 \n"
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"2: \n"
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: "=r"(scratch), "=r"(rv), "=r"(rtcu)
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: "n"(MPC601), "n"(SPR_RTCU_R), "n"(SPR_RTCL_R));
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return rv;
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}
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#endif /* _KERNEL */
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#endif /* _POWERPC_RND_H_ */
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