1 /*- 2 * Copyright (c) Peter Wemm <peter@netplex.com.au> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #ifndef _MACHINE_GLOBALDATA_H_ 30 #define _MACHINE_GLOBALDATA_H_ 31 32 #include <machine/segments.h> 33 #include <machine/tss.h> 34 35 /* XXX */ 36 #ifdef KTR_PERCPU 37 #include <sys/ktr.h> 38 #endif 39 40 /* 41 * This structure maps out the global data that needs to be kept on a 42 * per-cpu basis. genassym uses this to generate offsets for the assembler 43 * code, which also provides external symbols so that C can get at them as 44 * though they were really globals. 45 * 46 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 47 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 48 * The reason for doing it via a struct is so that an array of pointers 49 * to each CPU's data can be set up for things like "check curproc on all 50 * other processors" 51 */ 52 struct globaldata { 53 struct globaldata *gd_prvspace; /* self-reference */ 54 struct proc *gd_curproc; 55 struct proc *gd_npxproc; 56 struct pcb *gd_curpcb; 57 struct proc *gd_idleproc; 58 struct timeval gd_switchtime; 59 struct i386tss gd_common_tss; 60 int gd_switchticks; 61 struct segment_descriptor gd_common_tssd; 62 struct segment_descriptor *gd_tss_gdt; 63 int gd_currentldt; 64 u_int gd_cpuid; 65 u_int gd_other_cpus; 66 SLIST_ENTRY(globaldata) gd_allcpu; 67 struct lock_list_entry *gd_spinlocks; 68 #ifdef KTR_PERCPU 69 #ifdef KTR 70 volatile int gd_ktr_idx; 71 char *gd_ktr_buf; 72 char gd_ktr_buf_data[KTR_SIZE]; 73 #endif 74 #endif 75 }; 76 77 #ifdef SMP 78 /* 79 * This is the upper (0xff800000) address space layout that is per-cpu. 80 * It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for 81 * each AP. genassym helps export this to the assembler code. 82 */ 83 struct privatespace { 84 /* page 0 - data page */ 85 struct globaldata globaldata; 86 char __filler0[PAGE_SIZE - sizeof(struct globaldata)]; 87 88 /* page 1 - idle stack (UPAGES pages) */ 89 char idlestack[UPAGES * PAGE_SIZE]; 90 /* page 1+UPAGES... */ 91 }; 92 93 extern struct privatespace SMP_prvspace[]; 94 95 #endif 96 97 #endif /* ! _MACHINE_GLOBALDATA_H_ */ 98