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 * $Id: globaldata.h,v 1.4 1998/05/17 23:08:02 tegge Exp $ 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 proc *curproc; 43 struct proc *npxproc; 44 struct pcb *curpcb; 45 struct i386tss common_tss; 46 struct timeval switchtime; 47 #ifdef VM86 48 struct segment_descriptor common_tssd; 49 u_int private_tss; 50 u_int my_tr; 51 #endif 52 #ifdef SMP 53 u_int cpuid; 54 u_int cpu_lockid; 55 u_int other_cpus; 56 pd_entry_t *my_idlePTD; 57 u_int ss_eflags; 58 pt_entry_t *prv_CMAP1; 59 pt_entry_t *prv_CMAP2; 60 pt_entry_t *prv_CMAP3; 61 pt_entry_t *prv_PMAP1; 62 int inside_intr; 63 #endif 64 }; 65 66 #ifdef SMP 67 /* 68 * This is the upper (0xff800000) address space layout that is per-cpu. 69 * It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for 70 * each AP. genassym helps export this to the assembler code. 71 */ 72 struct privatespace { 73 /* page 0 - data page */ 74 struct globaldata globaldata; 75 char __filler0[PAGE_SIZE - sizeof(struct globaldata)]; 76 77 /* page 1 - page table page */ 78 pt_entry_t prvpt[NPTEPG]; 79 80 /* page 2 - local apic mapping */ 81 lapic_t lapic; 82 char __filler1[PAGE_SIZE - sizeof(lapic_t)]; 83 84 /* page 3..2+UPAGES - idle stack (UPAGES pages) */ 85 char idlestack[UPAGES * PAGE_SIZE]; 86 87 /* page 3+UPAGES..6+UPAGES - CPAGE1,CPAGE2,CPAGE3,PPAGE1 */ 88 char CPAGE1[PAGE_SIZE]; 89 char CPAGE2[PAGE_SIZE]; 90 char CPAGE3[PAGE_SIZE]; 91 char PPAGE1[PAGE_SIZE]; 92 93 /* page 7+UPAGES..15 - spare, unmapped */ 94 char __filler2[(9-UPAGES) * PAGE_SIZE]; 95 96 /* page 16-31 - space for IO apics */ 97 char ioapics[16 * PAGE_SIZE]; 98 99 /* page 32-47 - maybe other cpu's globaldata pages? */ 100 }; 101 #endif 102