88 lines
2.6 KiB
C
88 lines
2.6 KiB
C
/* $NetBSD: cpu_counter.h,v 1.6 2008/02/05 22:31:49 garbled Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2000 Tsubai Masanari. All rights reserved.
|
|
*
|
|
* 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. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 _POWERPC_CPU_COUNTER_H_
|
|
#define _POWERPC_CPU_COUNTER_H_
|
|
|
|
/*
|
|
* Machine-specific support for CPU counter.
|
|
*/
|
|
|
|
#ifdef _KERNEL
|
|
|
|
#include <powerpc/spr.h>
|
|
|
|
#define cpu_hascounter() (1)
|
|
#define cpu_counter() cpu_counter32()
|
|
|
|
static __inline uint32_t
|
|
cpu_counter32(void)
|
|
{
|
|
uint32_t rv, rtcu, scratch;
|
|
|
|
__asm volatile (
|
|
#ifdef PPC_OEA601
|
|
"mfpvr %0 \n"
|
|
"srwi %0,%0,16 \n"
|
|
"cmpwi %0,%3 \n"
|
|
"bne 1f \n" /* branch if not 601 */
|
|
"lis %0,0x77 \n"
|
|
"ori %0,%0,0x3594 \n" /* 7.8125e6 */
|
|
"mfspr %2,%4 \n"
|
|
"mullw %2,%2,%0 \n"
|
|
"mfspr %0,%5 \n"
|
|
"srwi %0,%0,7 \n"
|
|
"add %1,%2,%0 \n"
|
|
"b 2f \n"
|
|
"1: \n"
|
|
#endif /* PPC_OEA601 */
|
|
#ifdef PPC_IBM403
|
|
"mftblo %1 \n"
|
|
#else
|
|
"mftb %1 \n"
|
|
#endif
|
|
"2: \n"
|
|
: "=r"(scratch), "=r"(rv), "=r"(rtcu)
|
|
: "n"(MPC601), "n"(SPR_RTCU_R), "n"(SPR_RTCL_R));
|
|
|
|
return rv;
|
|
}
|
|
|
|
extern uint32_t ticks_per_sec;
|
|
|
|
static __inline uint64_t
|
|
cpu_frequency(struct cpu_info *ci)
|
|
{
|
|
/* XXX this probably only works on 603 and newer */
|
|
return ticks_per_sec;
|
|
}
|
|
|
|
#endif /* _KERNEL */
|
|
|
|
#endif /* _POWERPC_CPU_COUNTER_H_ */
|