61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
/* $FreeBSD$ */
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/* From: NetBSD: pcb.h,v 1.6 1997/04/06 08:47:33 cgd Exp */
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/*
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* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
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* All rights reserved.
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*
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* Author: Chris G. Demetriou
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*
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* Permission to use, copy, modify and distribute this software and
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* its documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
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* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the
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* rights to redistribute these changes.
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*/
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#ifndef _MACHINE_PCB_H_
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#define _MACHINE_PCB_H_
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#include <machine/frame.h>
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#include <machine/reg.h>
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#include <machine/alpha_cpu.h>
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/*
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* PCB: process control block
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*
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* In this case, the hardware structure that is the defining element
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* for a process, and the additional state that must be saved by software
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* on a context switch. Fields marked [HW] are mandated by hardware; fields
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* marked [SW] are for the software.
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*
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* It's said in the VMS PALcode section of the AARM that the pcb address
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* passed to the swpctx PALcode call has to be a physical address. Not
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* knowing this (and trying a virtual) address proved this correct.
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* So we cache the physical address of the pcb in the md_proc struct.
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*/
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struct pcb {
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struct alpha_pcb pcb_hw; /* PALcode defined */
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unsigned long pcb_context[9]; /* s[0-6], ra, ps [SW] */
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struct fpreg pcb_fp; /* FP registers [SW] */
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u_int64_t pcb_fp_control; /* IEEE control word [SW] */
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unsigned long pcb_onfault; /* for copy faults [SW] */
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unsigned long pcb_accessaddr; /* for [fs]uswintr [SW] */
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};
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#endif /* _MACHINE_PCB_H */
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