xref: /freebsd/sys/riscv/include/pcpu.h (revision 66df505066f51e6d8411b966765d828817f88971)
1 /*-
2  * Copyright (c) 1999 Luoqi Chen <luoqi@freebsd.org>
3  * Copyright (c) 2015-2016 Ruslan Bukin <br@bsdpad.com>
4  * All rights reserved.
5  *
6  * Portions of this software were developed by SRI International and the
7  * University of Cambridge Computer Laboratory under DARPA/AFRL contract
8  * FA8750-10-C-0237 ("CTSRD"), as part of the DARPA CRASH research programme.
9  *
10  * Portions of this software were developed by the University of Cambridge
11  * Computer Laboratory as part of the CTSRD Project, with support from the
12  * UK Higher Education Innovation Fund (HEIF).
13  *
14  * Redistribution and use in source and binary forms, with or without
15  * modification, are permitted provided that the following conditions
16  * are met:
17  * 1. Redistributions of source code must retain the above copyright
18  *    notice, this list of conditions and the following disclaimer.
19  * 2. Redistributions in binary form must reproduce the above copyright
20  *    notice, this list of conditions and the following disclaimer in the
21  *    documentation and/or other materials provided with the distribution.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33  * SUCH DAMAGE.
34  *
35  *	from: FreeBSD: src/sys/i386/include/globaldata.h,v 1.27 2001/04/27
36  * $FreeBSD$
37  */
38 
39 #ifndef	_MACHINE_PCPU_H_
40 #define	_MACHINE_PCPU_H_
41 
42 #include <machine/cpu.h>
43 #include <machine/cpufunc.h>
44 
45 #define	ALT_STACK_SIZE	128
46 
47 #define	PCPU_MD_FIELDS							\
48 	struct pmap *pc_curpmap;	/* Currently active pmap */	\
49 	uint32_t pc_pending_ipis;	/* IPIs pending to this CPU */	\
50 	uint32_t pc_hart;		/* Hart ID */			\
51 	char __pad[56]			/* Pad to factor of PAGE_SIZE */
52 
53 #ifdef _KERNEL
54 
55 struct pcb;
56 struct pcpu;
57 
58 static inline struct pcpu *
59 get_pcpu(void)
60 {
61 	struct pcpu *pcpu;
62 
63 	__asm __volatile("mv %0, tp" : "=&r"(pcpu));
64 
65 	return (pcpu);
66 }
67 
68 static inline struct thread *
69 get_curthread(void)
70 {
71 	struct thread *td;
72 
73 	__asm __volatile("ld %0, 0(tp)" : "=&r"(td));
74 
75 	return (td);
76 }
77 
78 #define	curthread get_curthread()
79 
80 #define	PCPU_GET(member)	(get_pcpu()->pc_ ## member)
81 #define	PCPU_ADD(member, value)	(get_pcpu()->pc_ ## member += (value))
82 #define	PCPU_PTR(member)	(&get_pcpu()->pc_ ## member)
83 #define	PCPU_SET(member,value)	(get_pcpu()->pc_ ## member = (value))
84 
85 #endif	/* _KERNEL */
86 
87 #endif	/* !_MACHINE_PCPU_H_ */
88