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