xref: /freebsd/sys/arm/include/pcpu.h (revision 3b9a898298abbf50c832a76a8485d0dcbffa6e9e)
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  * $FreeBSD$
28  */
29 
30 #ifndef	_MACHINE_PCPU_H_
31 #define	_MACHINE_PCPU_H_
32 
33 #ifdef _KERNEL
34 
35 #define	ALT_STACK_SIZE	128
36 
37 struct vmspace;
38 
39 #endif	/* _KERNEL */
40 
41 #if __ARM_ARCH >= 6
42 #define PCPU_MD_FIELDS							\
43 	unsigned int pc_vfpsid;						\
44 	unsigned int pc_vfpmvfr0;					\
45 	unsigned int pc_vfpmvfr1;					\
46 	struct pmap *pc_curpmap;					\
47 	vm_offset_t pc_qmap_addr;					\
48 	void *pc_qmap_pte;						\
49 	unsigned int pc_dbreg[32];					\
50 	int pc_dbreg_cmd;						\
51 	char __pad[1]
52 #else
53 #define PCPU_MD_FIELDS							\
54 	vm_offset_t qmap_addr;						\
55 	void *pc_qmap_pte;						\
56 	char __pad[149]
57 #endif
58 
59 #ifdef _KERNEL
60 
61 #define	PC_DBREG_CMD_NONE	0
62 #define	PC_DBREG_CMD_LOAD	1
63 
64 struct pcb;
65 struct pcpu;
66 
67 extern struct pcpu *pcpup;
68 
69 #if __ARM_ARCH >= 6
70 #define CPU_MASK (0xf)
71 
72 #ifndef SMP
73 #define get_pcpu() (pcpup)
74 #else
75 #define get_pcpu() __extension__ ({			  		\
76     	int id;								\
77         __asm __volatile("mrc p15, 0, %0, c0, c0, 5" : "=r" (id));	\
78     	(pcpup + (id & CPU_MASK));					\
79     })
80 #endif
81 
82 static inline struct thread *
83 get_curthread(void)
84 {
85 	void *ret;
86 
87 	__asm __volatile("mrc p15, 0, %0, c13, c0, 4" : "=r" (ret));
88 	return (ret);
89 }
90 
91 static inline void
92 set_curthread(struct thread *td)
93 {
94 
95 	__asm __volatile("mcr p15, 0, %0, c13, c0, 4" : : "r" (td));
96 }
97 
98 
99 static inline void *
100 get_tls(void)
101 {
102 	void *tls;
103 
104 	/* TPIDRURW contains the authoritative value. */
105 	__asm __volatile("mrc p15, 0, %0, c13, c0, 2" : "=r" (tls));
106 	return (tls);
107 }
108 
109 static inline void
110 set_tls(void *tls)
111 {
112 
113 	/*
114 	 * Update both TPIDRURW and TPIDRURO. TPIDRURW needs to be written
115 	 * first to ensure that a context switch between the two writes will
116 	 * still give the desired result of updating both.
117 	 */
118 	__asm __volatile(
119 	    "mcr p15, 0, %0, c13, c0, 2\n"
120 	    "mcr p15, 0, %0, c13, c0, 3\n"
121 	     : : "r" (tls));
122 }
123 
124 #define curthread get_curthread()
125 
126 #else
127 #define get_pcpu()	pcpup
128 #endif
129 
130 #define	PCPU_GET(member)	(get_pcpu()->pc_ ## member)
131 #define	PCPU_ADD(member, value)	(get_pcpu()->pc_ ## member += (value))
132 #define	PCPU_INC(member)	PCPU_ADD(member, 1)
133 #define	PCPU_PTR(member)	(&get_pcpu()->pc_ ## member)
134 #define	PCPU_SET(member,value)	(get_pcpu()->pc_ ## member = (value))
135 
136 void pcpu0_init(void);
137 #endif	/* _KERNEL */
138 
139 #endif	/* !_MACHINE_PCPU_H_ */
140