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pcb.h revision 1.2 
      1 /*	$NetBSD: pcb.h,v 1.2 1996/07/11 03:46:04 cgd 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 (at) 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 #include <machine/frame.h>
     31 #include <machine/reg.h>
     32 
     33 #include <machine/alpha_cpu.h>
     34 
     35 /*
     36  * PCB: process control block
     37  *
     38  * In this case, the hardware structure that is the defining element
     39  * for a process, and the additional state that must be saved by software
     40  * on a context switch.  Fields marked [HW] are mandated by hardware; fields
     41  * marked [SW] are for the software.
     42  *
     43  * It's said in the VMS PALcode section of the AARM that the pcb address
     44  * passed to the swpctx PALcode call has to be a physical address.  Not
     45  * knowing this (and trying a virtual) address proved this correct.
     46  * So we cache the physical address of the pcb in the md_proc struct.
     47  */
     48 struct pcb {
     49 	struct alpha_pcb pcb_hw;		/* PALcode defined */
     50 	u_int64_t	pcb_context[9];		/* s[0-6], ra, ps	[SW] */
     51 	struct fpreg	pcb_fp;			/* FP registers		[SW] */
     52 	caddr_t		pcb_onfault;		/* for copy faults	[SW] */
     53 };
     54 
     55 /*
     56  * The pcb is augmented with machine-dependent additional data for
     57  * core dumps. For the Alpha, that's a trap frame and the floating
     58  * point registers.
     59  */
     60 struct md_coredump {
     61 	struct	trapframe md_tf;
     62 };
     63