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 /* 30 * This structure maps out the global data that needs to be kept on a 31 * per-cpu basis. genassym uses this to generate offsets for the assembler 32 * code, which also provides external symbols so that C can get at them as 33 * though they were really globals. 34 * 35 * The SMP parts are setup in pmap.c and locore.s for the BSP, and 36 * mp_machdep.c sets up the data for the AP's to "see" when they awake. 37 * The reason for doing it via a struct is so that an array of pointers 38 * to each CPU's data can be set up for things like "check curproc on all 39 * other processors" 40 */ 41 struct globaldata { 42 struct privatespace *gd_prvspace; /* self-reference */ 43 struct proc *gd_curproc; 44 struct proc *gd_npxproc; 45 struct pcb *gd_curpcb; 46 struct timeval gd_switchtime; 47 struct i386tss gd_common_tss; 48 int gd_switchticks; 49 struct segment_descriptor gd_common_tssd; 50 struct segment_descriptor *gd_tss_gdt; 51 #ifdef USER_LDT 52 int gd_currentldt; 53 #endif 54 #ifdef SMP 55 u_int gd_cpuid; 56 u_int gd_cpu_lockid; 57 u_int gd_other_cpus; 58 int gd_inside_intr; 59 u_int gd_ss_eflags; 60 pt_entry_t *gd_prv_CMAP1; 61 pt_entry_t *gd_prv_CMAP2; 62 pt_entry_t *gd_prv_CMAP3; 63 pt_entry_t *gd_prv_PMAP1; 64 caddr_t gd_prv_CADDR1; 65 caddr_t gd_prv_CADDR2; 66 caddr_t gd_prv_CADDR3; 67 unsigned *gd_prv_PADDR1; 68 #endif 69 }; 70 71 #ifdef SMP 72 /* 73 * This is the upper (0xff800000) address space layout that is per-cpu. 74 * It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for 75 * each AP. genassym helps export this to the assembler code. 76 */ 77 struct privatespace { 78 /* page 0 - data page */ 79 struct globaldata globaldata; 80 char __filler0[PAGE_SIZE - sizeof(struct globaldata)]; 81 82 /* page 1..4 - CPAGE1,CPAGE2,CPAGE3,PPAGE1 */ 83 char CPAGE1[PAGE_SIZE]; 84 char CPAGE2[PAGE_SIZE]; 85 char CPAGE3[PAGE_SIZE]; 86 char PPAGE1[PAGE_SIZE]; 87 88 /* page 5..4+UPAGES - idle stack (UPAGES pages) */ 89 char idlestack[UPAGES * PAGE_SIZE]; 90 }; 91 92 extern struct privatespace SMP_prvspace[]; 93 94 #endif 95