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proc.h revision 1.21 
      1 /* $NetBSD: proc.h,v 1.21 2012/02/06 02:14:13 matt 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 #ifndef _ALPHA_PROC_H
     31 #define _ALPHA_PROC_H
     32 
     33 #include <machine/frame.h>
     34 #include <machine/pcb.h>
     35 
     36 /*
     37  * Machine-dependent part of the lwp struct for the Alpha.
     38  */
     39 struct mdlwp {
     40 	u_long md_flags;		/* see below */
     41 	struct trapframe *md_tf;	/* trap/syscall registers */
     42 	struct pcb *md_pcbpaddr;	/* phys addr of the pcb */
     43 	volatile int md_astpending;	/* AST pending for this thread */
     44 };
     45 
     46 /*
     47  * md_flags usage
     48  * --------------
     49  * MDLWP_FPUSED
     50  * 	A largely unused bit indicating the presence of FPU history.
     51  * 	Cleared on exec. Set but not used by the fpu context switcher
     52  * 	itself.
     53  *
     54  * MDLWP_FP_C
     55  * 	The architected FP Control word. It should forever begin at bit 1,
     56  * 	as the bits are AARM specified and this way it doesn't need to be
     57  * 	shifted.
     58  *
     59  * 	Until C99 there was never an IEEE 754 API, making most of the
     60  * 	standard useless.  Because of overlapping AARM, OSF/1, NetBSD, and
     61  * 	C99 API's, the use of the MDLWP_FP_C bits is defined variously in
     62  * 	ieeefp.h and fpu.h.
     63  */
     64 #define	MDLWP_FPUSED	0x00000001	/* LWP used the FPU */
     65 #define	MDLWP_FP_C	0x007ffffe	/* Extended FP_C Quadword bits */
     66 #define	MDLWP_FPACTIVE	__BIT(63)	/* FPU is active on LWP's PCU CPU */
     67 
     68 /*
     69  * Machine-dependent part of the proc struct for the Alpha.
     70  */
     71 struct lwp;
     72 struct mdproc {
     73 					/* this process's syscall vector */
     74 	void	(*md_syscall)(struct lwp *, uint64_t, struct trapframe *);
     75 };
     76 
     77 #ifdef _KERNEL
     78 #define	fpu_used_p(l)		(((l)->l_md.md_flags & MDLWP_FPUSED) != 0)
     79 #define	fpu_mark_used(l)	((void)((l)->l_md.md_flags |= MDLWP_FPUSED))
     80 #endif
     81 
     82 
     83 #endif /* !_ALPHA_PROC_H_ */
     84