globaldata.h

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    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         pd_entry_t      *gd_prv_PMAP1;
   64         pd_entry_t      *gd_prv_PMAP2;
   65         caddr_t         gd_prv_CADDR1;
   66         caddr_t         gd_prv_CADDR2;
   67         caddr_t         gd_prv_CADDR3;
   68         pt_entry_t      *gd_prv_PADDR1;
   69         pt_entry_t      *gd_prv_PADDR2;
   70 #endif
   71         u_int           gd_astpending;
   72 };
   73 
   74 #ifdef SMP
   75 /*
   76  * This is the upper (0xff800000) address space layout that is per-cpu.
   77  * It is setup in locore.s and pmap.c for the BSP and in mp_machdep.c for
   78  * each AP.  genassym helps export this to the assembler code.
   79  */
   80 struct privatespace {
   81         /* page 0 - data page */
   82         struct globaldata globaldata;
   83         char            __filler0[PAGE_SIZE - sizeof(struct globaldata)];
   84 
   85         /* page 1..5 - CPAGE1,CPAGE2,CPAGE3,PPAGE1,PPAGE2 */
   86         char            CPAGE1[PAGE_SIZE];
   87         char            CPAGE2[PAGE_SIZE];
   88         char            CPAGE3[PAGE_SIZE];
   89         char            PPAGE1[PAGE_SIZE];
   90         char            PPAGE2[PAGE_SIZE];
   91 
   92         /* page 6..5+UPAGES - idle stack (UPAGES pages) */
   93         char            idlestack[UPAGES * PAGE_SIZE];
   94 };
   95 
   96 extern struct privatespace SMP_prvspace[];
   97 
   98 #endif

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FreeBSD/Linux Kernel Cross Reference sys/i386/include/globaldata.h

FreeBSD/Linux Kernel Cross Reference
sys/i386/include/globaldata.h