1/*-
2 * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 *	from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
27 * $FreeBSD: stable/11/sys/arm/include/pcpu.h 331988 2018-04-04 06:11:05Z mmel $
28 */
29
30#ifndef	_MACHINE_PCPU_H_
31#define	_MACHINE_PCPU_H_
32
33#ifdef _KERNEL
34
35#include <sys/_lock.h>
36#include <sys/_mutex.h>
37
38#define	ALT_STACK_SIZE	128
39
40struct vmspace;
41
42#endif	/* _KERNEL */
43
44#if __ARM_ARCH >= 6
45/* Branch predictor hardening method */
46#define PCPU_BP_HARDEN_KIND_NONE		0
47#define PCPU_BP_HARDEN_KIND_BPIALL		1
48#define PCPU_BP_HARDEN_KIND_ICIALLU		2
49
50#define PCPU_MD_FIELDS							\
51	unsigned int pc_vfpsid;						\
52	unsigned int pc_vfpmvfr0;					\
53	unsigned int pc_vfpmvfr1;					\
54	struct pmap *pc_curpmap;					\
55	struct mtx pc_cmap_lock;					\
56	void *pc_cmap1_pte2p;						\
57	void *pc_cmap2_pte2p;						\
58	caddr_t pc_cmap1_addr;						\
59	caddr_t pc_cmap2_addr;						\
60	vm_offset_t pc_qmap_addr;					\
61	void *pc_qmap_pte2p;						\
62	unsigned int pc_dbreg[32];					\
63	int pc_dbreg_cmd;						\
64	int pc_bp_harden_kind;						\
65	uint32_t pc_original_actlr;					\
66	char __pad[11]
67#else
68#define PCPU_MD_FIELDS							\
69	char __pad[157]
70#endif
71
72#ifdef _KERNEL
73
74#define	PC_DBREG_CMD_NONE	0
75#define	PC_DBREG_CMD_LOAD	1
76
77struct pcb;
78struct pcpu;
79
80extern struct pcpu *pcpup;
81
82#if __ARM_ARCH >= 6
83#define CPU_MASK (0xf)
84
85#ifndef SMP
86#define get_pcpu() (pcpup)
87#else
88#define get_pcpu() __extension__ ({			  		\
89    	int id;								\
90        __asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));	\
91    	(pcpup + (id & CPU_MASK));					\
92    })
93#endif
94
95static inline struct thread *
96get_curthread(void)
97{
98	void *ret;
99
100	__asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
101	return (ret);
102}
103
104static inline void
105set_curthread(struct thread *td)
106{
107
108	__asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
109}
110
111
112static inline void *
113get_tls(void)
114{
115	void *tls;
116
117	/* TPIDRURW contains the authoritative value. */
118	__asm __volatile("mrc p15, 0, %0, c13, c0, 2" : "=r" (tls));
119	return (tls);
120}
121
122static inline void
123set_tls(void *tls)
124{
125
126	/*
127	 * Update both TPIDRURW and TPIDRURO. TPIDRURW needs to be written
128	 * first to ensure that a context switch between the two writes will
129	 * still give the desired result of updating both.
130	 */
131	__asm __volatile(
132	    "mcr p15, 0, %0, c13, c0, 2\n"
133	    "mcr p15, 0, %0, c13, c0, 3\n"
134	     : : "r" (tls));
135}
136
137#define curthread get_curthread()
138
139#else
140#define get_pcpu()	pcpup
141#endif
142
143#define	PCPU_GET(member)	(get_pcpu()->pc_ ## member)
144#define	PCPU_ADD(member, value)	(get_pcpu()->pc_ ## member += (value))
145#define	PCPU_INC(member)	PCPU_ADD(member, 1)
146#define	PCPU_PTR(member)	(&get_pcpu()->pc_ ## member)
147#define	PCPU_SET(member,value)	(get_pcpu()->pc_ ## member = (value))
148
149void pcpu0_init(void);
150#endif	/* _KERNEL */
151
152#endif	/* !_MACHINE_PCPU_H_ */
153