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pcb.h revision 1.8 
      1 /* $NetBSD: pcb.h,v 1.8 2001/04/20 00:10:18 thorpej 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 (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 <sys/lock.h>
     31 
     32 #include <machine/frame.h>
     33 #include <machine/reg.h>
     34 
     35 #include <machine/alpha_cpu.h>
     36 
     37 /*
     38  * PCB: process control block
     39  *
     40  * In this case, the hardware structure that is the defining element
     41  * for a process, and the additional state that must be saved by software
     42  * on a context switch.  Fields marked [HW] are mandated by hardware; fields
     43  * marked [SW] are for the software.
     44  *
     45  * It's said in the VMS PALcode section of the AARM that the pcb address
     46  * passed to the swpctx PALcode call has to be a physical address.  Not
     47  * knowing this (and trying a virtual) address proved this correct.
     48  * So we cache the physical address of the pcb in the md_proc struct.
     49  */
     50 struct pcb {
     51 	struct alpha_pcb pcb_hw;		/* PALcode defined */
     52 	unsigned long	pcb_context[9];		/* s[0-6], ra, ps	[SW] */
     53 	struct fpreg	pcb_fp;			/* FP registers		[SW] */
     54 	unsigned long	pcb_onfault;		/* for copy faults	[SW] */
     55 	unsigned long	pcb_accessaddr;		/* for [fs]uswintr	[SW] */
     56 	struct cpu_info * __volatile pcb_fpcpu;	/* CPU with our FP state[SW] */
     57 	struct simplelock pcb_fpcpu_slock;	/* simple lock on fpcpu [SW] */
     58 };
     59 
     60 #if defined(MULTIPROCESSOR)
     61 /*
     62  * Need to block IPIs while holding the fpcpu_slock.
     63  */
     64 #define	FPCPU_LOCK(pcb, s)						\
     65 do {									\
     66 	(s) = splhigh();						\
     67 	simple_lock(&(pcb)->pcb_fpcpu_slock);				\
     68 } while (/*CONSTCOND*/0)
     69 
     70 #define	FPCPU_UNLOCK(pcb, s)						\
     71 do {									\
     72 	simple_unlock(&(pcb)->pcb_fpcpu_slock);				\
     73 	splx((s));							\
     74 } while (/*CONSTCOND*/0)
     75 #else
     76 #define	FPCPU_LOCK(pcb, s)	simple_lock(&(pcb)->pcb_fpcpu_slock)
     77 #define	FPCPU_UNLOCK(pcb, s)	simple_unlock(&(pcb)->pcb_fpcpu_slock)
     78 #endif /* MULTIPROCESSOR */
     79 
     80 /*
     81  * The pcb is augmented with machine-dependent additional data for
     82  * core dumps. For the Alpha, that's a trap frame and the floating
     83  * point registers.
     84  */
     85 struct md_coredump {
     86 	struct	trapframe md_tf;
     87 	struct	fpreg md_fpstate;
     88 };
     89