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pcu.h
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pcu.h
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/* $NetBSD: pcu.h,v 1.9.2.2 2014/08/20 00:04:44 tls Exp $ */
/*-
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Mindaugas Rasiukevicius.
*
* 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.
*
* 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 _SYS_PCU_H_
#define _SYS_PCU_H_
#if !defined(_KERNEL) && !defined(_KMEMUSER)
#error "not supposed to be exposed to userland"
#endif
#ifndef _KERNEL
#include <stdbool.h>
#endif
/*
* Default: no PCU for MD.
*/
#ifndef PCU_UNIT_COUNT
#define PCU_UNIT_COUNT 0
#endif
#if PCU_UNIT_COUNT > 0
/*
* pcu_state_save(lwp)
* Tells MD code to save the current CPU's state into the given
* LWP's MD storage.
*
* pcu_state_load(lwp, flags)
* Tells MD code to load PCU state from the given LWP's MD storage
* to the current CPU.
*
* pcu_state_release(lwp)
* Tells MD code detect the next use of the PCU on the LWP and
* call pcu_load().
*/
typedef struct {
u_int pcu_id;
void (*pcu_state_save)(lwp_t *);
void (*pcu_state_load)(lwp_t *, unsigned);
void (*pcu_state_release)(lwp_t *);
} pcu_ops_t;
/*
* Flags for the pcu_state_load() operation.
*/
#define PCU_VALID 0x01 /* PCU state is considered valid */
#define PCU_REENABLE 0x02 /* the state is present, re-enable PCU */
void pcu_switchpoint(lwp_t *);
void pcu_discard_all(lwp_t *);
void pcu_save_all(lwp_t *);
void pcu_load(const pcu_ops_t *);
void pcu_save(const pcu_ops_t *);
void pcu_save_all_on_cpu(void);
void pcu_discard(const pcu_ops_t *, bool);
bool pcu_valid_p(const pcu_ops_t *);
#else
#define pcu_switchpoint(l)
#define pcu_discard_all(l)
#define pcu_save_all(l)
#endif
#endif