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Annotation of sys/arch/alpha/include/pcb.h, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: pcb.h,v 1.8 2005/10/30 20:55:50 miod Exp $    */
                      2: /*     $NetBSD: pcb.h,v 1.5 1996/11/13 22:21:00 cgd Exp $      */
                      3:
                      4: /*
                      5:  * Copyright (c) 1994, 1995, 1996 Carnegie-Mellon University.
                      6:  * All rights reserved.
                      7:  *
                      8:  * Author: Chris G. Demetriou
                      9:  *
                     10:  * Permission to use, copy, modify and distribute this software and
                     11:  * its documentation is hereby granted, provided that both the copyright
                     12:  * notice and this permission notice appear in all copies of the
                     13:  * software, derivative works or modified versions, and any portions
                     14:  * thereof, and that both notices appear in supporting documentation.
                     15:  *
                     16:  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
                     17:  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND
                     18:  * FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
                     19:  *
                     20:  * Carnegie Mellon requests users of this software to return to
                     21:  *
                     22:  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
                     23:  *  School of Computer Science
                     24:  *  Carnegie Mellon University
                     25:  *  Pittsburgh PA 15213-3890
                     26:  *
                     27:  * any improvements or extensions that they make and grant Carnegie the
                     28:  * rights to redistribute these changes.
                     29:  */
                     30:
                     31: #ifndef _ALPHA_PCB_H_
                     32: #define _ALPHA_PCB_H_
                     33:
                     34: #include <machine/frame.h>
                     35: #include <machine/reg.h>
                     36:
                     37: #include <machine/alpha_cpu.h>
                     38:
                     39: /*
                     40:  * PCB: process control block
                     41:  *
                     42:  * In this case, the hardware structure that is the defining element
                     43:  * for a process, and the additional state that must be saved by software
                     44:  * on a context switch.  Fields marked [HW] are mandated by hardware; fields
                     45:  * marked [SW] are for the software.
                     46:  *
                     47:  * It's said in the VMS PALcode section of the AARM that the pcb address
                     48:  * passed to the swpctx PALcode call has to be a physical address.  Not
                     49:  * knowing this (and trying a virtual) address proved this correct.
                     50:  * So we cache the physical address of the pcb in the md_proc struct.
                     51:  */
                     52: struct pcb {
                     53:        struct alpha_pcb pcb_hw;                /* PALcode defined */
                     54:        unsigned long   pcb_context[9];         /* s[0-6], ra, ps       [SW] */
                     55:        struct fpreg    pcb_fp;                 /* FP registers         [SW] */
                     56:        unsigned long   pcb_onfault;            /* for copy faults      [SW] */
                     57:        struct cpu_info *__volatile pcb_fpcpu;  /* CPU with our FP state[SW] */
                     58: };
                     59:
                     60: /*
                     61:  * The pcb is augmented with machine-dependent additional data for
                     62:  * core dumps. For the Alpha, that's a trap frame and the floating
                     63:  * point registers.
                     64:  */
                     65: struct md_coredump {
                     66:        struct  trapframe md_tf;
                     67:        struct  fpreg md_fpstate;
                     68: };
                     69:
                     70: #ifdef _KERNEL
                     71: void savectx(struct pcb *);
                     72: #endif
                     73:
                     74: #endif /* _ALPHA_PCB_H_ */