pcb.h revision 1.5 
1/*	$OpenBSD: pcb.h,v 1.5 2007/11/17 05:36:23 miod Exp $ */
2/*
3 * Copyright (c) 1996 Nivas Madhur
4 * Mach Operating System
5 * Copyright (c) 1993-1992 Carnegie Mellon University
6 * All Rights Reserved.
7 *
8 * Permission to use, copy, modify and distribute this software and its
9 * documentation is hereby granted, provided that both the copyright
10 * notice and this permission notice appear in all copies of the
11 * software, derivative works or modified versions, and any portions
12 * thereof, and that both notices appear in supporting documentation.
13 *
14 * CARNEGIE MELLON AND OMRON ALLOW FREE USE OF THIS SOFTWARE IN ITS "AS IS"
15 * CONDITION.  CARNEGIE MELLON AND OMRON DISCLAIM ANY LIABILITY OF ANY KIND
16 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
17 *
18 * Carnegie Mellon requests users of this software to return to
19 *
20 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
21 *  School of Computer Science
22 *  Carnegie Mellon University
23 *  Pittsburgh PA 15213-3890
24 *
25 * any improvements or extensions that they make and grant Carnegie Mellon
26 * the rights to redistribute these changes.
27 */
28/*
29 * Motorola 88100 pcb definitions
30 *
31 */
32/*
33 */
34#ifndef _M88K_PCB_H_
35#define _M88K_PCB_H_
36
37#include <machine/frame.h>
38
39/*
40 * Our PCB is the regular PCB+Save area for kernel frame.
41 * Upon entering kernel mode from user land, save the user context
42 * in the saved_state area - this is passed as the exception frame.
43 * On a context switch, only registers that need to be saved by the
44 * C calling convention and few other regs (pc, psr etc) are saved
45 * in the kernel_state part of the PCB. Typically, trap frames are
46 * saved on the stack (by low level handlers or by hardware) but,
47 * we just decided to do it in the PCB.
48 */
49
50struct m88100_pcb {
51	unsigned int pcb_pc;	/* address to return */
52	unsigned int :32;
53	unsigned int pcb_r14;
54	unsigned int pcb_r15;
55	unsigned int pcb_r16;
56	unsigned int pcb_r17;
57	unsigned int pcb_r18;
58	unsigned int pcb_r19;
59	unsigned int pcb_r20;
60	unsigned int pcb_r21;
61	unsigned int pcb_r22;
62	unsigned int pcb_r23;
63	unsigned int pcb_r24;
64	unsigned int pcb_r25;
65	unsigned int pcb_r26;
66	unsigned int pcb_r27;
67	unsigned int pcb_r28;
68	unsigned int pcb_r29;
69	unsigned int pcb_r30;
70	unsigned int pcb_sp; 	/* kernel stack pointer */
71	/* floating-point state */
72	unsigned int pcb_fcr62;
73	unsigned int pcb_fcr63;
74};
75
76struct pcb
77{
78	struct m88100_pcb	kernel_state;
79	struct trapframe	user_state;
80	int			pcb_onfault;
81};
82
83/*
84 *	Location of saved user registers for the proc.
85 */
86#define	USER_REGS(p) \
87	(((struct reg *)(&((p)->p_addr->u_pcb.user_state))))
88
89/*
90 * The pcb is augmented with machine-dependent additional data for
91 * core dumps.  Note that the trapframe here is a copy of the one
92 * from the top of the kernel stack (included here so that the kernel
93 * stack itself need not be dumped).
94 */
95struct md_coredump {
96	struct	trapframe md_tf;
97};
98
99#endif /* _M88K_PCB_H_ */
100