1 /* $NetBSD: pcb.h,v 1.18 2008/01/04 21:47:20 ad 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_ */ 85