1/*	$OpenBSD: pcb.h,v 1.3 1998/09/15 10:50:12 pefo Exp $	*/
2
3/*-
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1992, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department and Ralph Campbell.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 *	from: Utah Hdr: pcb.h 1.13 89/04/23
37 *	from: @(#)pcb.h 8.1 (Berkeley) 6/10/93
38 *	JNPR: pcb.h,v 1.2 2006/08/07 11:51:17 katta
39 * $FreeBSD$
40 */
41
42#ifndef _MACHINE_PCB_H_
43#define	_MACHINE_PCB_H_
44
45/*
46 * used by switch.S
47 */
48#define	PCB_REG_S0	0
49#define	PCB_REG_S1	1
50#define	PCB_REG_S2	2
51#define	PCB_REG_S3	3
52#define	PCB_REG_S4	4
53#define	PCB_REG_S5	5
54#define	PCB_REG_S6	6
55#define	PCB_REG_S7	7
56#define	PCB_REG_SP	8
57#define	PCB_REG_S8	9
58#define	PCB_REG_RA	10
59#define	PCB_REG_SR	11
60#define	PCB_REG_GP	12
61#define	PCB_REG_PC	13
62
63/*
64 * Call ast if required
65 *
66 * XXX Do we really need to disable interrupts?
67 */
68#define DO_AST				             \
6944:				                     \
70	mfc0	t0, MIPS_COP_0_STATUS               ;\
71	and	a0, t0, MIPS_SR_INT_IE              ;\
72	xor	t0, a0, t0                          ;\
73	mtc0	t0, MIPS_COP_0_STATUS               ;\
74	COP0_SYNC                                   ;\
75	GET_CPU_PCPU(s1)                            ;\
76	PTR_L	s3, PC_CURPCB(s1)                   ;\
77	PTR_L	s1, PC_CURTHREAD(s1)                ;\
78	lw	s2, TD_FLAGS(s1)                    ;\
79	li	s0, TDF_ASTPENDING | TDF_NEEDRESCHED;\
80	and	s2, s0                              ;\
81	mfc0	t0, MIPS_COP_0_STATUS               ;\
82	or	t0, a0, t0                          ;\
83	mtc0	t0, MIPS_COP_0_STATUS               ;\
84	COP0_SYNC                                   ;\
85	beq	s2, zero, 4f                        ;\
86	nop                                         ;\
87	PTR_LA	s0, _C_LABEL(ast)                   ;\
88	jalr	s0                                  ;\
89	PTR_ADDU a0, s3, U_PCB_REGS                 ;\
90	j	44b		                    ;\
91        nop                                         ;\
924:
93
94#define	SAVE_U_PCB_REG(reg, offs, base) \
95	REG_S	reg, U_PCB_REGS + (SZREG * offs) (base)
96
97#define	RESTORE_U_PCB_REG(reg, offs, base) \
98	REG_L	reg, U_PCB_REGS + (SZREG * offs) (base)
99
100#define	SAVE_U_PCB_FPREG(reg, offs, base) \
101	FP_S	reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
102
103#define	RESTORE_U_PCB_FPREG(reg, offs, base) \
104	FP_L	reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
105
106#define	SAVE_U_PCB_FPSR(reg, offs, base) \
107	REG_S	reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
108
109#define	RESTORE_U_PCB_FPSR(reg, offs, base) \
110	REG_L	reg, U_PCB_FPREGS + (SZFPREG * offs) (base)
111
112#define	SAVE_U_PCB_CONTEXT(reg, offs, base) \
113	REG_S	reg, U_PCB_CONTEXT + (SZREG * offs) (base)
114
115#define	RESTORE_U_PCB_CONTEXT(reg, offs, base) \
116	REG_L	reg, U_PCB_CONTEXT + (SZREG * offs) (base)
117
118#ifndef LOCORE
119#include <machine/frame.h>
120
121/*
122 * MIPS process control block
123 */
124struct pcb
125{
126	struct trapframe pcb_regs;	/* saved CPU and registers */
127	__register_t pcb_context[14];	/* kernel context for resume */
128	void *pcb_onfault;		/* for copyin/copyout faults */
129	register_t pcb_tpc;
130};
131
132#ifdef _KERNEL
133extern struct pcb *curpcb;		/* the current running pcb */
134
135void makectx(struct trapframe *, struct pcb *);
136int savectx(struct pcb *) __returns_twice;
137
138#endif
139#endif
140
141#endif	/* !_MACHINE_PCB_H_ */
142