1/*-
  2 * SPDX-License-Identifier: BSD-2-Clause
  3 *
  4 * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
  5 * All rights reserved.
  6 *
  7 * Redistribution and use in source and binary forms, with or without
  8 * modification, are permitted provided that the following conditions
  9 * are met:
 10 * 1. Redistributions of source code must retain the above copyright
 11 *    notice, this list of conditions and the following disclaimer.
 12 * 2. Redistributions in binary form must reproduce the above copyright
 13 *    notice, this list of conditions and the following disclaimer in the
 14 *    documentation and/or other materials provided with the distribution.
 15 *
 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 19 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 26 * SUCH DAMAGE.
 27 *
 28 *	from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
 29 */
 30
 31#ifndef	_MACHINE_PCPU_H_
 32#define	_MACHINE_PCPU_H_
 33
 34#ifdef _KERNEL
 35
 36#include <sys/_lock.h>
 37#include <sys/_mutex.h>
 38
 39struct vmspace;
 40
 41#endif	/* _KERNEL */
 42
 43/* Branch predictor hardening method */
 44#define PCPU_BP_HARDEN_KIND_NONE		0
 45#define PCPU_BP_HARDEN_KIND_BPIALL		1
 46#define PCPU_BP_HARDEN_KIND_ICIALLU		2
 47
 48#define PCPU_MD_FIELDS							\
 49	unsigned int pc_vfpsid;						\
 50	unsigned int pc_vfpmvfr0;					\
 51	unsigned int pc_vfpmvfr1;					\
 52	struct pmap *pc_curpmap;					\
 53	struct mtx pc_cmap_lock;					\
 54	void *pc_cmap1_pte2p;						\
 55	void *pc_cmap2_pte2p;						\
 56	caddr_t pc_cmap1_addr;						\
 57	caddr_t pc_cmap2_addr;						\
 58	vm_offset_t pc_qmap_addr;					\
 59	void *pc_qmap_pte2p;						\
 60	unsigned int pc_dbreg[32];					\
 61	int pc_dbreg_cmd;						\
 62	int pc_bp_harden_kind;						\
 63	uint32_t pc_original_actlr;					\
 64	uint64_t pc_clock;						\
 65	uint32_t pc_mpidr;						\
 66	char __pad[135]
 67
 68#ifdef _KERNEL
 69
 70#define	PC_DBREG_CMD_NONE	0
 71#define	PC_DBREG_CMD_LOAD	1
 72
 73struct pcb;
 74struct pcpu;
 75
 76extern struct pcpu *pcpup;
 77
 78#define CPU_MASK (0xf)
 79
 80#ifndef SMP
 81#define get_pcpu() (pcpup)
 82#else
 83#define get_pcpu() __extension__ ({			  		\
 84    	int id;								\
 85        __asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));	\
 86    	(pcpup + (id & CPU_MASK));					\
 87    })
 88#endif
 89
 90static inline struct thread *
 91get_curthread(void)
 92{
 93	void *ret;
 94
 95	__asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
 96	return (ret);
 97}
 98
 99static inline void
100set_curthread(struct thread *td)
101{
102
103	__asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
104}
105
106static inline void *
107get_tls(void)
108{
109	void *tls;
110
111	/* TPIDRURW contains the authoritative value. */
112	__asm __volatile("mrc p15, 0, %0, c13, c0, 2" : "=r" (tls));
113	return (tls);
114}
115
116static inline void
117set_tls(void *tls)
118{
119
120	/*
121	 * Update both TPIDRURW and TPIDRURO. TPIDRURW needs to be written
122	 * first to ensure that a context switch between the two writes will
123	 * still give the desired result of updating both.
124	 */
125	__asm __volatile(
126	    "mcr p15, 0, %0, c13, c0, 2\n"
127	    "mcr p15, 0, %0, c13, c0, 3\n"
128	     : : "r" (tls));
129}
130
131#define curthread get_curthread()
132
133
134#define	PCPU_GET(member)	(get_pcpu()->pc_ ## member)
135#define	PCPU_ADD(member, value)	(get_pcpu()->pc_ ## member += (value))
136#define	PCPU_PTR(member)	(&get_pcpu()->pc_ ## member)
137#define	PCPU_SET(member,value)	(get_pcpu()->pc_ ## member = (value))
138
139#define	PCPU_GET_MPIDR(pc)	((pc)->pc_mpidr)
140
141void pcpu0_init(void);
142#endif	/* _KERNEL */
143
144#endif	/* !_MACHINE_PCPU_H_ */