FreeBSD/Linux Kernel Cross Reference
sys/osfmk/i386/thread.h

     /*
      * 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@
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    /*
     * @OSF_COPYRIGHT@
     */
    /* 
     * Mach Operating System
     * Copyright (c) 1991,1990,1989 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.
     */
    /*
     */
    
    /*
     *      File:   machine/thread.h
     *
     *      This file contains the structure definitions for the thread
     *      state as applied to I386 processors.
     */
    
    #ifndef _I386_THREAD_H_
    #define _I386_THREAD_H_
    
    #include <mach/boolean.h>
    #include <mach/i386/vm_types.h>
    #include <mach/i386/fp_reg.h>
    
    #include <kern/lock.h>
    
    #include <i386/iopb.h>
    #include <i386/seg.h>
    #include <i386/tss.h>
    #include <i386/eflags.h>
    #include <i386/thread_act.h>
    
    /*
     *      i386_exception_link:
     *
     *      This structure lives at the high end of the kernel stack.
     *      It points to the current thread`s user registers.
     */
    struct i386_exception_link {
            struct i386_saved_state *saved_state;
    };
    
    
    /*
     *      On the kernel stack is:
     *      stack:  ...
     *              struct i386_exception_link
     *              struct i386_kernel_state
     *      stack+KERNEL_STACK_SIZE
     */
    
    #define STACK_IKS(stack)        \
            ((struct i386_kernel_state *)((stack) + KERNEL_STACK_SIZE) - 1)
    #define STACK_IEL(stack)        \
           ((struct i386_exception_link *)STACK_IKS(stack) - 1)
   
   #if     NCPUS > 1
   #include <i386/mp_desc.h>
   #endif
   
   /*
    * Boot-time data for master (or only) CPU
    */
   extern struct fake_descriptor   idt[IDTSZ];
   extern struct fake_descriptor   gdt[GDTSZ];
   extern struct fake_descriptor   ldt[LDTSZ];
   extern struct i386_tss          ktss;
   #if     MACH_KDB
   extern char                     db_stack_store[];
   extern char                     db_task_stack_store[];
   extern struct i386_tss          dbtss;
   extern void                     db_task_start(void);
   #endif  /* MACH_KDB */
   #if     NCPUS > 1
   #define curr_gdt(mycpu)         (mp_gdt[mycpu])
   #define curr_ktss(mycpu)        (mp_ktss[mycpu])
   #else
   #define curr_gdt(mycpu)         (gdt)
   #define curr_ktss(mycpu)        (&ktss)
   #endif
   
   #define gdt_desc_p(mycpu,sel) \
           ((struct real_descriptor *)&curr_gdt(mycpu)[sel_idx(sel)])
   
   /*
    * Return address of the function that called current function, given
    *      address of the first parameter of current function.
    */
   #define GET_RETURN_PC(addr)     (*((vm_offset_t *)addr - 1))
   
   /*
    * Defining this indicates that MD code will supply an exception()
    * routine, conformant with kern/exception.c (dependency alert!)
    * but which does wonderfully fast, machine-dependent magic.
    */
   #define MACHINE_FAST_EXCEPTION 1
   
   #endif  /* _I386_THREAD_H_ */

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