1/*	$OpenBSD: pcb.h,v 1.3 1998/09/15 10:50:12 pefo Exp $	*/
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 1988 University of Utah.
7 * Copyright (c) 1992, 1993
8 *	The Regents of the University of California.  All rights reserved.
9 *
10 * This code is derived from software contributed to Berkeley by
11 * the Systems Programming Group of the University of Utah Computer
12 * Science Department and Ralph Campbell.
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 * 3. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 *	from: Utah Hdr: pcb.h 1.13 89/04/23
39 *	from: @(#)pcb.h 8.1 (Berkeley) 6/10/93
40 *	JNPR: pcb.h,v 1.2 2006/08/07 11:51:17 katta
41 * $FreeBSD$
42 */
43
44#ifndef _MACHINE_PCB_H_
45#define	_MACHINE_PCB_H_
46
47/*
48 * used by switch.S
49 */
50#define	PCB_REG_S0	0
51#define	PCB_REG_S1	1
52#define	PCB_REG_S2	2
53#define	PCB_REG_S3	3
54#define	PCB_REG_S4	4
55#define	PCB_REG_S5	5
56#define	PCB_REG_S6	6
57#define	PCB_REG_S7	7
58#define	PCB_REG_SP	8
59#define	PCB_REG_S8	9
60#define	PCB_REG_RA	10
61#define	PCB_REG_SR	11
62#define	PCB_REG_GP	12
63#define	PCB_REG_PC	13
64
65/*
66 * Call ast if required
67 *
68 * XXX Do we really need to disable interrupts?
69 */
70#define DO_AST				             \
7144:				                     \
72	mfc0	t0, MIPS_COP_0_STATUS               ;\
73	and	a0, t0, MIPS_SR_INT_IE              ;\
74	xor	t0, a0, t0                          ;\
75	mtc0	t0, MIPS_COP_0_STATUS               ;\
76	COP0_SYNC                                   ;\
77	GET_CPU_PCPU(s1)                            ;\
78	PTR_L	s3, PC_CURPCB(s1)                   ;\
79	PTR_L	s1, PC_CURTHREAD(s1)                ;\
80	lw	s2, TD_FLAGS(s1)                    ;\
81	li	s0, TDF_ASTPENDING | TDF_NEEDRESCHED;\
82	and	s2, s0                              ;\
83	mfc0	t0, MIPS_COP_0_STATUS               ;\
84	or	t0, a0, t0                          ;\
85	mtc0	t0, MIPS_COP_0_STATUS               ;\
86	COP0_SYNC                                   ;\
87	beq	s2, zero, 4f                        ;\
88	nop                                         ;\
89	PTR_LA	s0, _C_LABEL(ast)                   ;\
90	jalr	s0                                  ;\
91	PTR_ADDU a0, s3, U_PCB_REGS                 ;\
92	j	44b		                    ;\
93        nop                                         ;\
944:
95
96#define	SAVE_U_PCB_REG(reg, offs, base) \
97	REG_S	reg, U_PCB_REGS + (SZREG * offs) (base)
98
99#define	RESTORE_U_PCB_REG(reg, offs, base) \
100	REG_L	reg, U_PCB_REGS + (SZREG * offs) (base)
101
102#define	SAVE_U_PCB_FPREG(reg, offs, base) \
103	FP_S	reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
104
105#define	RESTORE_U_PCB_FPREG(reg, offs, base) \
106	FP_L	reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
107
108#define	SAVE_U_PCB_FPSR(reg, offs, base) \
109	REG_S	reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
110
111#define	RESTORE_U_PCB_FPSR(reg, offs, base) \
112	REG_L	reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
113
114#define	SAVE_U_PCB_CONTEXT(reg, offs, base) \
115	REG_S	reg, U_PCB_CONTEXT + (SZREG * offs) (base)
116
117#define	RESTORE_U_PCB_CONTEXT(reg, offs, base) \
118	REG_L	reg, U_PCB_CONTEXT + (SZREG * offs) (base)
119
120#ifndef LOCORE
121#include <machine/frame.h>
122
123/*
124 * MIPS process control block
125 */
126struct pcb
127{
128	struct trapframe pcb_regs;	/* saved CPU and registers */
129	__register_t pcb_context[14];	/* kernel context for resume */
130	void *pcb_onfault;		/* for copyin/copyout faults */
131	register_t pcb_tpc;
132};
133
134#ifdef _KERNEL
135extern struct pcb *curpcb;		/* the current running pcb */
136
137void makectx(struct trapframe *, struct pcb *);
138int savectx(struct pcb *) __returns_twice;
139
140#endif
141#endif
142
143#endif	/* !_MACHINE_PCB_H_ */
144