/*-
 * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
 * Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
 * All rights reserved.
 *
 * Portions of this software were developed by SRI International and the
 * University of Cambridge Computer Laboratory under DARPA/AFRL contract
 * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
 *
 * Portions of this software were developed by the University of Cambridge
 * Computer Laboratory as part of the CTSRD Project, with support from the
 * UK Higher Education Innovation Fund (HEIF).
 *
 * 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 AUTHOR 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 AUTHOR 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.
 *
 *	from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
 * $FreeBSD$
 */

#ifndef	_MACHINE_PCPU_H_
#define	_MACHINE_PCPU_H_

#include <machine/cpu.h>
#include <machine/cpufunc.h>

#define	ALT_STACK_SIZE	128

/* Keep in sync with db_show_mdpcpu() */
#define	PCPU_MD_FIELDS							\
	struct pmap *pc_curpmap;	/* Currently active pmap */	\
	uint32_t pc_pending_ipis;	/* IPIs pending to this CPU */	\
	uint32_t pc_hart;		/* Hart ID */			\
	char __pad[56]			/* Pad to factor of PAGE_SIZE */

#ifdef _KERNEL

struct pcb;
struct pcpu;

static inline struct pcpu *
get_pcpu(void)
{
	struct pcpu *pcpu;

	__asm __volatile("mv %0, tp" : "=&r"(pcpu));

	return (pcpu);
}

static inline struct thread *
get_curthread(void)
{
	struct thread *td;

	__asm __volatile("ld %0, 0(tp)" : "=&r"(td));

	return (td);
}

#define	curthread get_curthread()

#define	PCPU_GET(member)	(get_pcpu()->pc_ ## member)
#define	PCPU_ADD(member, value)	(get_pcpu()->pc_ ## member += (value))
#define	PCPU_PTR(member)	(&get_pcpu()->pc_ ## member)
#define	PCPU_SET(member,value)	(get_pcpu()->pc_ ## member = (value))

#endif	/* _KERNEL */

#endif	/* !_MACHINE_PCPU_H_ */