/* $NetBSD: cpu_counter.h,v 1.9 2020/07/06 10:31:23 rin 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
#ifdef _KERNEL_OPT
#include "opt_ppcarch.h"
#endif
#include <powerpc/spr.h>
#ifdef PPC_OEA601
#include <powerpc/oea/spr.h>
#endif
#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"
#elif defined(PPC_IBM403)
"mftblo %1 \n"
#elif defined(PPC_BOOKE)
"mfspr %1,%3 \n"
#else
"mftb %1 \n"
#endif
"2: \n"
: "=r"(scratch), "=r"(rv), "=r"(rtcu)
#ifdef PPC_OEA601
: "n"(MPC601), "n"(SPR_RTCU_R), "n"(SPR_RTCL_R)
#elif defined(PPC_BOOKE)
: "n"(SPR_TBL)
#endif
);
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_ */
