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/* $OpenBSD: pcb.h,v 1.9 2011/03/23 16:54:34 pirofti Exp $ */
/* $NetBSD: pcb.h,v 1.5 1996/11/13 22:21:00 cgd Exp $ */
/*
* Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
* All rights reserved.
*
* Author: Chris G. Demetriou
*
* Permission to use, copy, modify and distribute this software and
* its documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
* FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie the
* rights to redistribute these changes.
*/
#ifndef _MACHINE_PCB_H_
#define _MACHINE_PCB_H_
#include <machine/frame.h>
#include <machine/reg.h>
#include <machine/alpha_cpu.h>
/*
* PCB: process control block
*
* In this case, the hardware structure that is the defining element
* for a process, and the additional state that must be saved by software
* on a context switch. Fields marked [HW] are mandated by hardware; fields
* marked [SW] are for the software.
*
* It's said in the VMS PALcode section of the AARM that the pcb address
* passed to the swpctx PALcode call has to be a physical address. Not
* knowing this (and trying a virtual) address proved this correct.
* So we cache the physical address of the pcb in the md_proc struct.
*/
struct pcb {
struct alpha_pcb pcb_hw; /* PALcode defined */
unsigned long pcb_context[9]; /* s[0-6], ra, ps [SW] */
struct fpreg pcb_fp; /* FP registers [SW] */
unsigned long pcb_onfault; /* for copy faults [SW] */
struct cpu_info *__volatile pcb_fpcpu; /* CPU with our FP state[SW] */
};
/*
* The pcb is augmented with machine-dependent additional data for
* core dumps. For the Alpha, that's a trap frame and the floating
* point registers.
*/
struct md_coredump {
struct trapframe md_tf;
struct fpreg md_fpstate;
};
#ifdef _KERNEL
void savectx(struct pcb *);
#endif
#endif /* _MACHINE_PCB_H_ */
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