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@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