sys/arch/alpha/include/pcb.h

   1 /* $NetBSD: pcb.h,v 1.17 2007/10/17 19:52:58 garbled Exp $ */
   2
   3 /*
   4  * Copyright (c) 1994, 1995, 1996 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@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 #ifndef _ALPHA_PCB_H_
  31 #define _ALPHA_PCB_H_
  32
  33 #ifdef _KERNEL_OPT
  34 #include "opt_multiprocessor.h"
  35 #endif
  36
  37 #include <sys/simplelock.h>
  38
  39 #include <machine/frame.h>
  40 #include <machine/reg.h>
  41
  42 #include <machine/alpha_cpu.h>
  43
  44 /*
  45  * PCB: process control block
  46  *
  47  * In this case, the hardware structure that is the defining element
  48  * for a process, and the additional state that must be saved by software
  49  * on a context switch.  Fields marked [HW] are mandated by hardware; fields
  50  * marked [SW] are for the software.
  51  *
  52  * It's said in the VMS PALcode section of the AARM that the pcb address
  53  * passed to the swpctx PALcode call has to be a physical address.  Not
  54  * knowing this (and trying a virtual) address proved this correct.
  55  * So we cache the physical address of the pcb in the md_proc struct.
  56  */
  57 struct pcb {
  58         struct alpha_pcb pcb_hw;                /* PALcode defined */
  59         unsigned long   pcb_context[8];         /* s[0-6], ra           [SW] */
  60         struct fpreg    pcb_fp;                 /* FP registers         [SW] */
  61         unsigned long   pcb_onfault;            /* for copy faults      [SW] */
  62         unsigned long   pcb_accessaddr;         /* for [fs]uswintr      [SW] */
  63         struct cpu_info * volatile pcb_fpcpu;   /* CPU with our FP state[SW] */
  64         struct simplelock pcb_fpcpu_slock;      /* simple lock on fpcpu [SW] */
  65 };
  66
  67 /*
  68  * MULTIPROCESSOR:
  69  * Need to block IPIs while holding the fpcpu_slock.  That is the
  70  * responsibility of the CALLER!
  71  */
  72 #define FPCPU_LOCK(pcb)         simple_lock(&(pcb)->pcb_fpcpu_slock)
  73 #define FPCPU_UNLOCK(pcb)       simple_unlock(&(pcb)->pcb_fpcpu_slock)
  74
  75 /*
  76  * The pcb is augmented with machine-dependent additional data for
  77  * core dumps. For the Alpha, that's a trap frame and the floating
  78  * point registers.
  79  */
  80 struct md_coredump {
  81         struct  trapframe md_tf;
  82         struct  fpreg md_fpstate;
  83 };
  84 #endif /* _ALPHA_PCB_H_ */