1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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 * $FreeBSD$
30 */
31
32#ifndef	_MACHINE_PCPU_H_
33#define	_MACHINE_PCPU_H_
34
35#ifdef _KERNEL
36
37#include <sys/_lock.h>
38#include <sys/_mutex.h>
39
40#define	ALT_STACK_SIZE	128
41
42struct vmspace;
43
44#endif	/* _KERNEL */
45
46/* Branch predictor hardening method */
47#define PCPU_BP_HARDEN_KIND_NONE		0
48#define PCPU_BP_HARDEN_KIND_BPIALL		1
49#define PCPU_BP_HARDEN_KIND_ICIALLU		2
50
51#define PCPU_MD_FIELDS							\
52	unsigned int pc_vfpsid;						\
53	unsigned int pc_vfpmvfr0;					\
54	unsigned int pc_vfpmvfr1;					\
55	struct pmap *pc_curpmap;					\
56	struct mtx pc_cmap_lock;					\
57	void *pc_cmap1_pte2p;						\
58	void *pc_cmap2_pte2p;						\
59	caddr_t pc_cmap1_addr;						\
60	caddr_t pc_cmap2_addr;						\
61	vm_offset_t pc_qmap_addr;					\
62	void *pc_qmap_pte2p;						\
63	unsigned int pc_dbreg[32];					\
64	int pc_dbreg_cmd;						\
65	int pc_bp_harden_kind;						\
66	uint32_t pc_original_actlr;					\
67	uint64_t pc_clock;						\
68	uint32_t pc_mpidr;						\
69	char __pad[135]
70
71#ifdef _KERNEL
72
73#define	PC_DBREG_CMD_NONE	0
74#define	PC_DBREG_CMD_LOAD	1
75
76struct pcb;
77struct pcpu;
78
79extern struct pcpu *pcpup;
80
81#define CPU_MASK (0xf)
82
83#ifndef SMP
84#define get_pcpu() (pcpup)
85#else
86#define get_pcpu() __extension__ ({			  		\
87    	int id;								\
88        __asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));	\
89    	(pcpup + (id & CPU_MASK));					\
90    })
91#endif
92
93static inline struct thread *
94get_curthread(void)
95{
96	void *ret;
97
98	__asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
99	return (ret);
100}
101
102static inline void
103set_curthread(struct thread *td)
104{
105
106	__asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
107}
108
109static inline void *
110get_tls(void)
111{
112	void *tls;
113
114	/* TPIDRURW contains the authoritative value. */
115	__asm __volatile("mrc p15, 0, %0, c13, c0, 2" : "=r" (tls));
116	return (tls);
117}
118
119static inline void
120set_tls(void *tls)
121{
122
123	/*
124	 * Update both TPIDRURW and TPIDRURO. TPIDRURW needs to be written
125	 * first to ensure that a context switch between the two writes will
126	 * still give the desired result of updating both.
127	 */
128	__asm __volatile(
129	    "mcr p15, 0, %0, c13, c0, 2\n"
130	    "mcr p15, 0, %0, c13, c0, 3\n"
131	     : : "r" (tls));
132}
133
134#define curthread get_curthread()
135
136
137#define	PCPU_GET(member)	(get_pcpu()->pc_ ## member)
138#define	PCPU_ADD(member, value)	(get_pcpu()->pc_ ## member += (value))
139#define	PCPU_INC(member)	PCPU_ADD(member, 1)
140#define	PCPU_PTR(member)	(&get_pcpu()->pc_ ## member)
141#define	PCPU_SET(member,value)	(get_pcpu()->pc_ ## member = (value))
142
143void pcpu0_init(void);
144#endif	/* _KERNEL */
145
146#endif	/* !_MACHINE_PCPU_H_ */
147