pcpu.h revision 330897 
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: stable/11/sys/arm/include/pcpu.h 330897 2018-03-14 03:19:51Z eadler $
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#if __ARM_ARCH >= 6
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	char __pad[19]
63#else
64#define PCPU_MD_FIELDS							\
65	char __pad[157]
66#endif
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#if __ARM_ARCH >= 6
79#define CPU_MASK (0xf)
80
81#ifndef SMP
82#define get_pcpu() (pcpup)
83#else
84#define get_pcpu() __extension__ ({			  		\
85    	int id;								\
86        __asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));	\
87    	(pcpup + (id & CPU_MASK));					\
88    })
89#endif
90
91static inline struct thread *
92get_curthread(void)
93{
94	void *ret;
95
96	__asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
97	return (ret);
98}
99
100static inline void
101set_curthread(struct thread *td)
102{
103
104	__asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
105}
106
107
108static inline void *
109get_tls(void)
110{
111	void *tls;
112
113	/* TPIDRURW contains the authoritative value. */
114	__asm __volatile("mrc p15, 0, %0, c13, c0, 2" : "=r" (tls));
115	return (tls);
116}
117
118static inline void
119set_tls(void *tls)
120{
121
122	/*
123	 * Update both TPIDRURW and TPIDRURO. TPIDRURW needs to be written
124	 * first to ensure that a context switch between the two writes will
125	 * still give the desired result of updating both.
126	 */
127	__asm __volatile(
128	    "mcr p15, 0, %0, c13, c0, 2\n"
129	    "mcr p15, 0, %0, c13, c0, 3\n"
130	     : : "r" (tls));
131}
132
133#define curthread get_curthread()
134
135#else
136#define get_pcpu()	pcpup
137#endif
138
139#define	PCPU_GET(member)	(get_pcpu()->pc_ ## member)
140#define	PCPU_ADD(member, value)	(get_pcpu()->pc_ ## member += (value))
141#define	PCPU_INC(member)	PCPU_ADD(member, 1)
142#define	PCPU_PTR(member)	(&get_pcpu()->pc_ ## member)
143#define	PCPU_SET(member,value)	(get_pcpu()->pc_ ## member = (value))
144
145void pcpu0_init(void);
146#endif	/* _KERNEL */
147
148#endif	/* !_MACHINE_PCPU_H_ */
149