1/* $NetBSD: proc.h,v 1.23 2021/07/22 01:31:55 thorpej Exp $ */
2
3/*
4 * Copyright (c) 1994, 1995 Carnegie-Mellon University.
5 * All rights reserved.
6 *
7 * Author: Chris G. Demetriou
8 *
9 * Permission to use, copy, modify and distribute this software and
10 * its documentation is hereby granted, provided that both the copyright
11 * notice and this permission notice appear in all copies of the
12 * software, derivative works or modified versions, and any portions
13 * thereof, and that both notices appear in supporting documentation.
14 *
15 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
16 * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
17 * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
18 *
19 * Carnegie Mellon requests users of this software to return to
20 *
21 *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
22 *  School of Computer Science
23 *  Carnegie Mellon University
24 *  Pittsburgh PA 15213-3890
25 *
26 * any improvements or extensions that they make and grant Carnegie the
27 * rights to redistribute these changes.
28 */
29
30#ifndef _ALPHA_PROC_H
31#define _ALPHA_PROC_H
32
33#include <machine/frame.h>
34#include <machine/pcb.h>
35
36/*
37 * Machine-dependent part of the lwp struct for the Alpha.
38 */
39struct mdlwp {
40	u_long md_flags;		/* see below */
41	struct trapframe *md_tf;	/* trap/syscall registers */
42	struct pcb *md_pcbpaddr;	/* phys addr of the pcb */
43	volatile int md_astpending;	/* AST pending for this thread */
44};
45
46/*
47 * md_flags usage
48 * --------------
49 * MDLWP_FPUSED
50 * 	A largely unused bit indicating the presence of FPU history.
51 * 	Cleared on exec. Set but not used by the fpu context switcher
52 * 	itself.
53 *
54 * MDLWP_FP_C
55 * 	The architected FP Control word. It should forever begin at bit 1,
56 * 	as the bits are AARM specified and this way it doesn't need to be
57 * 	shifted.
58 *
59 * 	Until C99 there was never an IEEE 754 API, making most of the
60 * 	standard useless.  Because of overlapping AARM, OSF/1, NetBSD, and
61 * 	C99 API's, the use of the MDLWP_FP_C bits is defined variously in
62 * 	ieeefp.h and fpu.h.
63 */
64#define	MDLWP_FP_C	__BITS(1,22)	/* Extended FP_C Quadword bits */
65#define	MDLWP_FPACTIVE	__BIT(63)	/* FPU is active on LWP's PCU CPU */
66
67/*
68 * Machine-dependent part of the proc struct for the Alpha.
69 */
70struct lwp;
71struct mdproc {
72					/* this process's syscall vector */
73	void	(*md_syscall)(struct lwp *, uint64_t, struct trapframe *);
74};
75
76#endif /* !_ALPHA_PROC_H_ */
77