FreeBSD/Linux Kernel Cross Reference
sys/osfmk/i386/gdt.c

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * @OSF_COPYRIGHT@
     */
    /* CMU_ENDHIST */
    /* 
     * Mach Operating System
     * Copyright (c) 1991,1990 Carnegie Mellon University
     * All Rights Reserved.
     * 
     * Permission to use, copy, modify and distribute this software and its
     * documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     */
    
    /*
     * Global descriptor table.
     */
    #include <i386/thread.h>
    #include <i386/seg.h>
    #include <mach/i386/vm_param.h>
    #include <kern/thread.h>
    #include <mach_kdb.h>
    
    #ifdef  MACH_BSD
    extern int      trap_unix_syscall(void), trap_mach25_syscall(void),
                    trap_machdep_syscall(void), syscall(void);
    #endif
    
    struct fake_descriptor gdt[GDTSZ] = {
    /* 0x000 */     { 0, 0, 0, 0 },         /* always NULL */
    /* 0x008 */     { LINEAR_KERNEL_ADDRESS + VM_MIN_ADDRESS,
                      (VM_MAX_KERNEL_ADDRESS-1-VM_MIN_KERNEL_ADDRESS)>>12,
                      SZ_32|SZ_G,
                      ACC_P|ACC_PL_K|ACC_CODE_R
                    },                      /* kernel code */
    /* 0x010 */     { LINEAR_KERNEL_ADDRESS + VM_MIN_ADDRESS,
                      (VM_MAX_KERNEL_ADDRESS-1-VM_MIN_KERNEL_ADDRESS)>>12,
                      SZ_32|SZ_G,
                      ACC_P|ACC_PL_K|ACC_DATA_W
                    },                      /* kernel data */
    /* 0x018 */     { LINEAR_KERNEL_ADDRESS + (unsigned int)ldt,
                      LDTSZ*sizeof(struct fake_descriptor)-1,
                      0,
                      ACC_P|ACC_PL_K|ACC_LDT
                    },                      /* local descriptor table */
    /* 0x020 */     { LINEAR_KERNEL_ADDRESS + (unsigned int)&ktss,
                      sizeof(struct i386_tss)-1,
                      0,
                      ACC_P|ACC_PL_K|ACC_TSS
                    },                      /* TSS for this processor */
    #ifdef  MACH_BSD
    /* 0x28 */      { (unsigned int) &trap_unix_syscall,
                       KERNEL_CS,
                       0,                           /* no parameters */
                       ACC_P|ACC_PL_U|ACC_CALL_GATE
                    },
    /* 0x30 */      { (unsigned int) &trap_mach25_syscall,
                      KERNEL_CS,
                      0,                           /* no parameters */
                      ACC_P|ACC_PL_U|ACC_CALL_GATE
                   },
   /* 0x38 */      { (unsigned int) &trap_machdep_syscall,
                      KERNEL_CS,
                      0,                           /* no parameters */
                      ACC_P|ACC_PL_U|ACC_CALL_GATE
                   },
   #else
   /* 0x028 */     { 0, 0, 0, 0 },         /* per-thread LDT */
   /* 0x030 */     { 0, 0, 0, 0 },         /* per-thread TSS for IO bitmap */
   /* 0x038 */     { 0, 0, 0, 0 },
   #endif
   /* 0x040 */     { 0, 0, 0, 0 },
   /* 0x048 */     { LINEAR_KERNEL_ADDRESS + (unsigned int)&cpu_data[0],
                     sizeof(cpu_data)-1,
                     SZ_32,
                     ACC_P|ACC_PL_K|ACC_DATA_W
                   },                      /* per-CPU current thread address */
   #if     MACH_KDB
   /* 0x050 */     { LINEAR_KERNEL_ADDRESS + (unsigned int)&dbtss,
                     sizeof(struct i386_tss)-1,
                     0,
                     ACC_P|ACC_PL_K|ACC_TSS
                   }                       /* TSS for this processor */
   #endif  /* MACH_KDB */
   };

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